1 | /* |
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2 | * jidctint.c |
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3 | * |
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4 | * Copyright (C) 1991-1998, Thomas G. Lane. |
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5 | * Modification developed 2002-2009 by Guido Vollbeding. |
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6 | * This file is part of the Independent JPEG Group's software. |
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7 | * For conditions of distribution and use, see the accompanying README file. |
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8 | * |
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9 | * This file contains a slow-but-accurate integer implementation of the |
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10 | * inverse DCT (Discrete Cosine Transform). In the IJG code, this routine |
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11 | * must also perform dequantization of the input coefficients. |
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12 | * |
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13 | * A 2-D IDCT can be done by 1-D IDCT on each column followed by 1-D IDCT |
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14 | * on each row (or vice versa, but it's more convenient to emit a row at |
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15 | * a time). Direct algorithms are also available, but they are much more |
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16 | * complex and seem not to be any faster when reduced to code. |
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17 | * |
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18 | * This implementation is based on an algorithm described in |
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19 | * C. Loeffler, A. Ligtenberg and G. Moschytz, "Practical Fast 1-D DCT |
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20 | * Algorithms with 11 Multiplications", Proc. Int'l. Conf. on Acoustics, |
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21 | * Speech, and Signal Processing 1989 (ICASSP '89), pp. 988-991. |
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22 | * The primary algorithm described there uses 11 multiplies and 29 adds. |
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23 | * We use their alternate method with 12 multiplies and 32 adds. |
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24 | * The advantage of this method is that no data path contains more than one |
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25 | * multiplication; this allows a very simple and accurate implementation in |
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26 | * scaled fixed-point arithmetic, with a minimal number of shifts. |
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27 | * |
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28 | * We also provide IDCT routines with various output sample block sizes for |
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29 | * direct resolution reduction or enlargement and for direct resolving the |
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30 | * common 2x1 and 1x2 subsampling cases without additional resampling: NxN |
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31 | * (N=1...16), 2NxN, and Nx2N (N=1...8) pixels for one 8x8 input DCT block. |
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32 | * |
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33 | * For N<8 we simply take the corresponding low-frequency coefficients of |
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34 | * the 8x8 input DCT block and apply an NxN point IDCT on the sub-block |
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35 | * to yield the downscaled outputs. |
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36 | * This can be seen as direct low-pass downsampling from the DCT domain |
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37 | * point of view rather than the usual spatial domain point of view, |
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38 | * yielding significant computational savings and results at least |
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39 | * as good as common bilinear (averaging) spatial downsampling. |
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40 | * |
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41 | * For N>8 we apply a partial NxN IDCT on the 8 input coefficients as |
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42 | * lower frequencies and higher frequencies assumed to be zero. |
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43 | * It turns out that the computational effort is similar to the 8x8 IDCT |
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44 | * regarding the output size. |
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45 | * Furthermore, the scaling and descaling is the same for all IDCT sizes. |
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46 | * |
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47 | * CAUTION: We rely on the FIX() macro except for the N=1,2,4,8 cases |
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48 | * since there would be too many additional constants to pre-calculate. |
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49 | */ |
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50 | |
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51 | #define JPEG_INTERNALS |
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52 | #include "jinclude.h" |
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53 | #include "jpeglib.h" |
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54 | #include "jdct.h" /* Private declarations for DCT subsystem */ |
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55 | |
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56 | #ifdef DCT_ISLOW_SUPPORTED |
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57 | |
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58 | |
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59 | /* |
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60 | * This module is specialized to the case DCTSIZE = 8. |
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61 | */ |
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62 | |
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63 | #if DCTSIZE != 8 |
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64 | Sorry, this code only copes with 8x8 DCT blocks. /* deliberate syntax err */ |
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65 | #endif |
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66 | |
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67 | |
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68 | /* |
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69 | * The poop on this scaling stuff is as follows: |
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70 | * |
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71 | * Each 1-D IDCT step produces outputs which are a factor of sqrt(N) |
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72 | * larger than the true IDCT outputs. The final outputs are therefore |
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73 | * a factor of N larger than desired; since N=8 this can be cured by |
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74 | * a simple right shift at the end of the algorithm. The advantage of |
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75 | * this arrangement is that we save two multiplications per 1-D IDCT, |
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76 | * because the y0 and y4 inputs need not be divided by sqrt(N). |
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77 | * |
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78 | * We have to do addition and subtraction of the integer inputs, which |
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79 | * is no problem, and multiplication by fractional constants, which is |
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80 | * a problem to do in integer arithmetic. We multiply all the constants |
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81 | * by CONST_SCALE and convert them to integer constants (thus retaining |
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82 | * CONST_BITS bits of precision in the constants). After doing a |
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83 | * multiplication we have to divide the product by CONST_SCALE, with proper |
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84 | * rounding, to produce the correct output. This division can be done |
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85 | * cheaply as a right shift of CONST_BITS bits. We postpone shifting |
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86 | * as long as possible so that partial sums can be added together with |
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87 | * full fractional precision. |
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88 | * |
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89 | * The outputs of the first pass are scaled up by PASS1_BITS bits so that |
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90 | * they are represented to better-than-integral precision. These outputs |
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91 | * require BITS_IN_JSAMPLE + PASS1_BITS + 3 bits; this fits in a 16-bit word |
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92 | * with the recommended scaling. (To scale up 12-bit sample data further, an |
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93 | * intermediate INT32 array would be needed.) |
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94 | * |
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95 | * To avoid overflow of the 32-bit intermediate results in pass 2, we must |
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96 | * have BITS_IN_JSAMPLE + CONST_BITS + PASS1_BITS <= 26. Error analysis |
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97 | * shows that the values given below are the most effective. |
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98 | */ |
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99 | |
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100 | #if BITS_IN_JSAMPLE == 8 |
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101 | #define CONST_BITS 13 |
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102 | #define PASS1_BITS 2 |
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103 | #else |
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104 | #define CONST_BITS 13 |
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105 | #define PASS1_BITS 1 /* lose a little precision to avoid overflow */ |
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106 | #endif |
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107 | |
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108 | /* Some C compilers fail to reduce "FIX(constant)" at compile time, thus |
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109 | * causing a lot of useless floating-point operations at run time. |
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110 | * To get around this we use the following pre-calculated constants. |
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111 | * If you change CONST_BITS you may want to add appropriate values. |
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112 | * (With a reasonable C compiler, you can just rely on the FIX() macro...) |
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113 | */ |
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114 | |
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115 | #if CONST_BITS == 13 |
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116 | #define FIX_0_298631336 ((INT32) 2446) /* FIX(0.298631336) */ |
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117 | #define FIX_0_390180644 ((INT32) 3196) /* FIX(0.390180644) */ |
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118 | #define FIX_0_541196100 ((INT32) 4433) /* FIX(0.541196100) */ |
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119 | #define FIX_0_765366865 ((INT32) 6270) /* FIX(0.765366865) */ |
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120 | #define FIX_0_899976223 ((INT32) 7373) /* FIX(0.899976223) */ |
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121 | #define FIX_1_175875602 ((INT32) 9633) /* FIX(1.175875602) */ |
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122 | #define FIX_1_501321110 ((INT32) 12299) /* FIX(1.501321110) */ |
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123 | #define FIX_1_847759065 ((INT32) 15137) /* FIX(1.847759065) */ |
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124 | #define FIX_1_961570560 ((INT32) 16069) /* FIX(1.961570560) */ |
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125 | #define FIX_2_053119869 ((INT32) 16819) /* FIX(2.053119869) */ |
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126 | #define FIX_2_562915447 ((INT32) 20995) /* FIX(2.562915447) */ |
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127 | #define FIX_3_072711026 ((INT32) 25172) /* FIX(3.072711026) */ |
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128 | #else |
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129 | #define FIX_0_298631336 FIX(0.298631336) |
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130 | #define FIX_0_390180644 FIX(0.390180644) |
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131 | #define FIX_0_541196100 FIX(0.541196100) |
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132 | #define FIX_0_765366865 FIX(0.765366865) |
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133 | #define FIX_0_899976223 FIX(0.899976223) |
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134 | #define FIX_1_175875602 FIX(1.175875602) |
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135 | #define FIX_1_501321110 FIX(1.501321110) |
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136 | #define FIX_1_847759065 FIX(1.847759065) |
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137 | #define FIX_1_961570560 FIX(1.961570560) |
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138 | #define FIX_2_053119869 FIX(2.053119869) |
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139 | #define FIX_2_562915447 FIX(2.562915447) |
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140 | #define FIX_3_072711026 FIX(3.072711026) |
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141 | #endif |
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142 | |
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143 | |
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144 | /* Multiply an INT32 variable by an INT32 constant to yield an INT32 result. |
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145 | * For 8-bit samples with the recommended scaling, all the variable |
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146 | * and constant values involved are no more than 16 bits wide, so a |
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147 | * 16x16->32 bit multiply can be used instead of a full 32x32 multiply. |
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148 | * For 12-bit samples, a full 32-bit multiplication will be needed. |
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149 | */ |
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150 | |
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151 | #if BITS_IN_JSAMPLE == 8 |
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152 | #define MULTIPLY(var,const) MULTIPLY16C16(var,const) |
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153 | #else |
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154 | #define MULTIPLY(var,const) ((var) * (const)) |
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155 | #endif |
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156 | |
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157 | |
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158 | /* Dequantize a coefficient by multiplying it by the multiplier-table |
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159 | * entry; produce an int result. In this module, both inputs and result |
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160 | * are 16 bits or less, so either int or short multiply will work. |
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161 | */ |
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162 | |
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163 | #define DEQUANTIZE(coef,quantval) (((ISLOW_MULT_TYPE) (coef)) * (quantval)) |
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164 | |
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165 | |
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166 | /* |
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167 | * Perform dequantization and inverse DCT on one block of coefficients. |
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168 | */ |
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169 | |
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170 | GLOBAL(void) |
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171 | jpeg_idct_islow (j_decompress_ptr cinfo, jpeg_component_info * compptr, |
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172 | JCOEFPTR coef_block, |
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173 | JSAMPARRAY output_buf, JDIMENSION output_col) |
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174 | { |
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175 | INT32 tmp0, tmp1, tmp2, tmp3; |
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176 | INT32 tmp10, tmp11, tmp12, tmp13; |
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177 | INT32 z1, z2, z3; |
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178 | JCOEFPTR inptr; |
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179 | ISLOW_MULT_TYPE * quantptr; |
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180 | int * wsptr; |
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181 | JSAMPROW outptr; |
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182 | JSAMPLE *range_limit = IDCT_range_limit(cinfo); |
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183 | int ctr; |
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184 | int workspace[DCTSIZE2]; /* buffers data between passes */ |
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185 | SHIFT_TEMPS |
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186 | |
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187 | /* Pass 1: process columns from input, store into work array. */ |
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188 | /* Note results are scaled up by sqrt(8) compared to a true IDCT; */ |
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189 | /* furthermore, we scale the results by 2**PASS1_BITS. */ |
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190 | |
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191 | inptr = coef_block; |
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192 | quantptr = (ISLOW_MULT_TYPE *) compptr->dct_table; |
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193 | wsptr = workspace; |
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194 | for (ctr = DCTSIZE; ctr > 0; ctr--) { |
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195 | /* Due to quantization, we will usually find that many of the input |
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196 | * coefficients are zero, especially the AC terms. We can exploit this |
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197 | * by short-circuiting the IDCT calculation for any column in which all |
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198 | * the AC terms are zero. In that case each output is equal to the |
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199 | * DC coefficient (with scale factor as needed). |
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200 | * With typical images and quantization tables, half or more of the |
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201 | * column DCT calculations can be simplified this way. |
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202 | */ |
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203 | |
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204 | if (inptr[DCTSIZE*1] == 0 && inptr[DCTSIZE*2] == 0 && |
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205 | inptr[DCTSIZE*3] == 0 && inptr[DCTSIZE*4] == 0 && |
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206 | inptr[DCTSIZE*5] == 0 && inptr[DCTSIZE*6] == 0 && |
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207 | inptr[DCTSIZE*7] == 0) { |
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208 | /* AC terms all zero */ |
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209 | int dcval = DEQUANTIZE(inptr[DCTSIZE*0], quantptr[DCTSIZE*0]) << PASS1_BITS; |
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210 | |
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211 | wsptr[DCTSIZE*0] = dcval; |
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212 | wsptr[DCTSIZE*1] = dcval; |
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213 | wsptr[DCTSIZE*2] = dcval; |
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214 | wsptr[DCTSIZE*3] = dcval; |
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215 | wsptr[DCTSIZE*4] = dcval; |
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216 | wsptr[DCTSIZE*5] = dcval; |
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217 | wsptr[DCTSIZE*6] = dcval; |
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218 | wsptr[DCTSIZE*7] = dcval; |
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219 | |
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220 | inptr++; /* advance pointers to next column */ |
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221 | quantptr++; |
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222 | wsptr++; |
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223 | continue; |
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224 | } |
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225 | |
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226 | /* Even part: reverse the even part of the forward DCT. */ |
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227 | /* The rotator is sqrt(2)*c(-6). */ |
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228 | |
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229 | z2 = DEQUANTIZE(inptr[DCTSIZE*2], quantptr[DCTSIZE*2]); |
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230 | z3 = DEQUANTIZE(inptr[DCTSIZE*6], quantptr[DCTSIZE*6]); |
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231 | |
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232 | z1 = MULTIPLY(z2 + z3, FIX_0_541196100); |
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233 | tmp2 = z1 + MULTIPLY(z2, FIX_0_765366865); |
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234 | tmp3 = z1 - MULTIPLY(z3, FIX_1_847759065); |
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235 | |
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236 | z2 = DEQUANTIZE(inptr[DCTSIZE*0], quantptr[DCTSIZE*0]); |
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237 | z3 = DEQUANTIZE(inptr[DCTSIZE*4], quantptr[DCTSIZE*4]); |
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238 | z2 <<= CONST_BITS; |
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239 | z3 <<= CONST_BITS; |
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240 | /* Add fudge factor here for final descale. */ |
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241 | z2 += ONE << (CONST_BITS-PASS1_BITS-1); |
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242 | |
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243 | tmp0 = z2 + z3; |
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244 | tmp1 = z2 - z3; |
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245 | |
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246 | tmp10 = tmp0 + tmp2; |
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247 | tmp13 = tmp0 - tmp2; |
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248 | tmp11 = tmp1 + tmp3; |
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249 | tmp12 = tmp1 - tmp3; |
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250 | |
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251 | /* Odd part per figure 8; the matrix is unitary and hence its |
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252 | * transpose is its inverse. i0..i3 are y7,y5,y3,y1 respectively. |
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253 | */ |
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254 | |
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255 | tmp0 = DEQUANTIZE(inptr[DCTSIZE*7], quantptr[DCTSIZE*7]); |
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256 | tmp1 = DEQUANTIZE(inptr[DCTSIZE*5], quantptr[DCTSIZE*5]); |
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257 | tmp2 = DEQUANTIZE(inptr[DCTSIZE*3], quantptr[DCTSIZE*3]); |
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258 | tmp3 = DEQUANTIZE(inptr[DCTSIZE*1], quantptr[DCTSIZE*1]); |
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259 | |
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260 | z2 = tmp0 + tmp2; |
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261 | z3 = tmp1 + tmp3; |
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262 | |
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263 | z1 = MULTIPLY(z2 + z3, FIX_1_175875602); /* sqrt(2) * c3 */ |
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264 | z2 = MULTIPLY(z2, - FIX_1_961570560); /* sqrt(2) * (-c3-c5) */ |
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265 | z3 = MULTIPLY(z3, - FIX_0_390180644); /* sqrt(2) * (c5-c3) */ |
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266 | z2 += z1; |
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267 | z3 += z1; |
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268 | |
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269 | z1 = MULTIPLY(tmp0 + tmp3, - FIX_0_899976223); /* sqrt(2) * (c7-c3) */ |
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270 | tmp0 = MULTIPLY(tmp0, FIX_0_298631336); /* sqrt(2) * (-c1+c3+c5-c7) */ |
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271 | tmp3 = MULTIPLY(tmp3, FIX_1_501321110); /* sqrt(2) * ( c1+c3-c5-c7) */ |
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272 | tmp0 += z1 + z2; |
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273 | tmp3 += z1 + z3; |
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274 | |
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275 | z1 = MULTIPLY(tmp1 + tmp2, - FIX_2_562915447); /* sqrt(2) * (-c1-c3) */ |
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276 | tmp1 = MULTIPLY(tmp1, FIX_2_053119869); /* sqrt(2) * ( c1+c3-c5+c7) */ |
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277 | tmp2 = MULTIPLY(tmp2, FIX_3_072711026); /* sqrt(2) * ( c1+c3+c5-c7) */ |
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278 | tmp1 += z1 + z3; |
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279 | tmp2 += z1 + z2; |
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280 | |
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281 | /* Final output stage: inputs are tmp10..tmp13, tmp0..tmp3 */ |
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282 | |
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283 | wsptr[DCTSIZE*0] = (int) RIGHT_SHIFT(tmp10 + tmp3, CONST_BITS-PASS1_BITS); |
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284 | wsptr[DCTSIZE*7] = (int) RIGHT_SHIFT(tmp10 - tmp3, CONST_BITS-PASS1_BITS); |
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285 | wsptr[DCTSIZE*1] = (int) RIGHT_SHIFT(tmp11 + tmp2, CONST_BITS-PASS1_BITS); |
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286 | wsptr[DCTSIZE*6] = (int) RIGHT_SHIFT(tmp11 - tmp2, CONST_BITS-PASS1_BITS); |
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287 | wsptr[DCTSIZE*2] = (int) RIGHT_SHIFT(tmp12 + tmp1, CONST_BITS-PASS1_BITS); |
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288 | wsptr[DCTSIZE*5] = (int) RIGHT_SHIFT(tmp12 - tmp1, CONST_BITS-PASS1_BITS); |
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289 | wsptr[DCTSIZE*3] = (int) RIGHT_SHIFT(tmp13 + tmp0, CONST_BITS-PASS1_BITS); |
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290 | wsptr[DCTSIZE*4] = (int) RIGHT_SHIFT(tmp13 - tmp0, CONST_BITS-PASS1_BITS); |
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291 | |
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292 | inptr++; /* advance pointers to next column */ |
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293 | quantptr++; |
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294 | wsptr++; |
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295 | } |
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296 | |
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297 | /* Pass 2: process rows from work array, store into output array. */ |
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298 | /* Note that we must descale the results by a factor of 8 == 2**3, */ |
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299 | /* and also undo the PASS1_BITS scaling. */ |
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300 | |
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301 | wsptr = workspace; |
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302 | for (ctr = 0; ctr < DCTSIZE; ctr++) { |
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303 | outptr = output_buf[ctr] + output_col; |
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304 | /* Rows of zeroes can be exploited in the same way as we did with columns. |
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305 | * However, the column calculation has created many nonzero AC terms, so |
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306 | * the simplification applies less often (typically 5% to 10% of the time). |
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307 | * On machines with very fast multiplication, it's possible that the |
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308 | * test takes more time than it's worth. In that case this section |
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309 | * may be commented out. |
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310 | */ |
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311 | |
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312 | #ifndef NO_ZERO_ROW_TEST |
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313 | if (wsptr[1] == 0 && wsptr[2] == 0 && wsptr[3] == 0 && wsptr[4] == 0 && |
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314 | wsptr[5] == 0 && wsptr[6] == 0 && wsptr[7] == 0) { |
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315 | /* AC terms all zero */ |
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316 | JSAMPLE dcval = range_limit[(int) DESCALE((INT32) wsptr[0], PASS1_BITS+3) |
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317 | & RANGE_MASK]; |
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318 | |
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319 | outptr[0] = dcval; |
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320 | outptr[1] = dcval; |
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321 | outptr[2] = dcval; |
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322 | outptr[3] = dcval; |
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323 | outptr[4] = dcval; |
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324 | outptr[5] = dcval; |
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325 | outptr[6] = dcval; |
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326 | outptr[7] = dcval; |
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327 | |
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328 | wsptr += DCTSIZE; /* advance pointer to next row */ |
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329 | continue; |
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330 | } |
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331 | #endif |
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332 | |
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333 | /* Even part: reverse the even part of the forward DCT. */ |
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334 | /* The rotator is sqrt(2)*c(-6). */ |
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335 | |
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336 | z2 = (INT32) wsptr[2]; |
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337 | z3 = (INT32) wsptr[6]; |
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338 | |
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339 | z1 = MULTIPLY(z2 + z3, FIX_0_541196100); |
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340 | tmp2 = z1 + MULTIPLY(z2, FIX_0_765366865); |
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341 | tmp3 = z1 - MULTIPLY(z3, FIX_1_847759065); |
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342 | |
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343 | /* Add fudge factor here for final descale. */ |
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344 | z2 = (INT32) wsptr[0] + (ONE << (PASS1_BITS+2)); |
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345 | z3 = (INT32) wsptr[4]; |
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346 | |
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347 | tmp0 = (z2 + z3) << CONST_BITS; |
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348 | tmp1 = (z2 - z3) << CONST_BITS; |
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349 | |
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350 | tmp10 = tmp0 + tmp2; |
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351 | tmp13 = tmp0 - tmp2; |
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352 | tmp11 = tmp1 + tmp3; |
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353 | tmp12 = tmp1 - tmp3; |
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354 | |
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355 | /* Odd part per figure 8; the matrix is unitary and hence its |
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356 | * transpose is its inverse. i0..i3 are y7,y5,y3,y1 respectively. |
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357 | */ |
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358 | |
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359 | tmp0 = (INT32) wsptr[7]; |
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360 | tmp1 = (INT32) wsptr[5]; |
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361 | tmp2 = (INT32) wsptr[3]; |
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362 | tmp3 = (INT32) wsptr[1]; |
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363 | |
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364 | z2 = tmp0 + tmp2; |
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365 | z3 = tmp1 + tmp3; |
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366 | |
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367 | z1 = MULTIPLY(z2 + z3, FIX_1_175875602); /* sqrt(2) * c3 */ |
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368 | z2 = MULTIPLY(z2, - FIX_1_961570560); /* sqrt(2) * (-c3-c5) */ |
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369 | z3 = MULTIPLY(z3, - FIX_0_390180644); /* sqrt(2) * (c5-c3) */ |
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370 | z2 += z1; |
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371 | z3 += z1; |
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372 | |
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373 | z1 = MULTIPLY(tmp0 + tmp3, - FIX_0_899976223); /* sqrt(2) * (c7-c3) */ |
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374 | tmp0 = MULTIPLY(tmp0, FIX_0_298631336); /* sqrt(2) * (-c1+c3+c5-c7) */ |
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375 | tmp3 = MULTIPLY(tmp3, FIX_1_501321110); /* sqrt(2) * ( c1+c3-c5-c7) */ |
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376 | tmp0 += z1 + z2; |
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377 | tmp3 += z1 + z3; |
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378 | |
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379 | z1 = MULTIPLY(tmp1 + tmp2, - FIX_2_562915447); /* sqrt(2) * (-c1-c3) */ |
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380 | tmp1 = MULTIPLY(tmp1, FIX_2_053119869); /* sqrt(2) * ( c1+c3-c5+c7) */ |
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381 | tmp2 = MULTIPLY(tmp2, FIX_3_072711026); /* sqrt(2) * ( c1+c3+c5-c7) */ |
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382 | tmp1 += z1 + z3; |
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383 | tmp2 += z1 + z2; |
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384 | |
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385 | /* Final output stage: inputs are tmp10..tmp13, tmp0..tmp3 */ |
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386 | |
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387 | outptr[0] = range_limit[(int) RIGHT_SHIFT(tmp10 + tmp3, |
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388 | CONST_BITS+PASS1_BITS+3) |
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389 | & RANGE_MASK]; |
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390 | outptr[7] = range_limit[(int) RIGHT_SHIFT(tmp10 - tmp3, |
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391 | CONST_BITS+PASS1_BITS+3) |
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392 | & RANGE_MASK]; |
---|
393 | outptr[1] = range_limit[(int) RIGHT_SHIFT(tmp11 + tmp2, |
---|
394 | CONST_BITS+PASS1_BITS+3) |
---|
395 | & RANGE_MASK]; |
---|
396 | outptr[6] = range_limit[(int) RIGHT_SHIFT(tmp11 - tmp2, |
---|
397 | CONST_BITS+PASS1_BITS+3) |
---|
398 | & RANGE_MASK]; |
---|
399 | outptr[2] = range_limit[(int) RIGHT_SHIFT(tmp12 + tmp1, |
---|
400 | CONST_BITS+PASS1_BITS+3) |
---|
401 | & RANGE_MASK]; |
---|
402 | outptr[5] = range_limit[(int) RIGHT_SHIFT(tmp12 - tmp1, |
---|
403 | CONST_BITS+PASS1_BITS+3) |
---|
404 | & RANGE_MASK]; |
---|
405 | outptr[3] = range_limit[(int) RIGHT_SHIFT(tmp13 + tmp0, |
---|
406 | CONST_BITS+PASS1_BITS+3) |
---|
407 | & RANGE_MASK]; |
---|
408 | outptr[4] = range_limit[(int) RIGHT_SHIFT(tmp13 - tmp0, |
---|
409 | CONST_BITS+PASS1_BITS+3) |
---|
410 | & RANGE_MASK]; |
---|
411 | |
---|
412 | wsptr += DCTSIZE; /* advance pointer to next row */ |
---|
413 | } |
---|
414 | } |
---|
415 | |
---|
416 | #ifdef IDCT_SCALING_SUPPORTED |
---|
417 | |
---|
418 | |
---|
419 | /* |
---|
420 | * Perform dequantization and inverse DCT on one block of coefficients, |
---|
421 | * producing a 7x7 output block. |
---|
422 | * |
---|
423 | * Optimized algorithm with 12 multiplications in the 1-D kernel. |
---|
424 | * cK represents sqrt(2) * cos(K*pi/14). |
---|
425 | */ |
---|
426 | |
---|
427 | GLOBAL(void) |
---|
428 | jpeg_idct_7x7 (j_decompress_ptr cinfo, jpeg_component_info * compptr, |
---|
429 | JCOEFPTR coef_block, |
---|
430 | JSAMPARRAY output_buf, JDIMENSION output_col) |
---|
431 | { |
---|
432 | INT32 tmp0, tmp1, tmp2, tmp10, tmp11, tmp12, tmp13; |
---|
433 | INT32 z1, z2, z3; |
---|
434 | JCOEFPTR inptr; |
---|
435 | ISLOW_MULT_TYPE * quantptr; |
---|
436 | int * wsptr; |
---|
437 | JSAMPROW outptr; |
---|
438 | JSAMPLE *range_limit = IDCT_range_limit(cinfo); |
---|
439 | int ctr; |
---|
440 | int workspace[7*7]; /* buffers data between passes */ |
---|
441 | SHIFT_TEMPS |
---|
442 | |
---|
443 | /* Pass 1: process columns from input, store into work array. */ |
---|
444 | |
---|
445 | inptr = coef_block; |
---|
446 | quantptr = (ISLOW_MULT_TYPE *) compptr->dct_table; |
---|
447 | wsptr = workspace; |
---|
448 | for (ctr = 0; ctr < 7; ctr++, inptr++, quantptr++, wsptr++) { |
---|
449 | /* Even part */ |
---|
450 | |
---|
451 | tmp13 = DEQUANTIZE(inptr[DCTSIZE*0], quantptr[DCTSIZE*0]); |
---|
452 | tmp13 <<= CONST_BITS; |
---|
453 | /* Add fudge factor here for final descale. */ |
---|
454 | tmp13 += ONE << (CONST_BITS-PASS1_BITS-1); |
---|
455 | |
---|
456 | z1 = DEQUANTIZE(inptr[DCTSIZE*2], quantptr[DCTSIZE*2]); |
---|
457 | z2 = DEQUANTIZE(inptr[DCTSIZE*4], quantptr[DCTSIZE*4]); |
---|
458 | z3 = DEQUANTIZE(inptr[DCTSIZE*6], quantptr[DCTSIZE*6]); |
---|
459 | |
---|
460 | tmp10 = MULTIPLY(z2 - z3, FIX(0.881747734)); /* c4 */ |
---|
461 | tmp12 = MULTIPLY(z1 - z2, FIX(0.314692123)); /* c6 */ |
---|
462 | tmp11 = tmp10 + tmp12 + tmp13 - MULTIPLY(z2, FIX(1.841218003)); /* c2+c4-c6 */ |
---|
463 | tmp0 = z1 + z3; |
---|
464 | z2 -= tmp0; |
---|
465 | tmp0 = MULTIPLY(tmp0, FIX(1.274162392)) + tmp13; /* c2 */ |
---|
466 | tmp10 += tmp0 - MULTIPLY(z3, FIX(0.077722536)); /* c2-c4-c6 */ |
---|
467 | tmp12 += tmp0 - MULTIPLY(z1, FIX(2.470602249)); /* c2+c4+c6 */ |
---|
468 | tmp13 += MULTIPLY(z2, FIX(1.414213562)); /* c0 */ |
---|
469 | |
---|
470 | /* Odd part */ |
---|
471 | |
---|
472 | z1 = DEQUANTIZE(inptr[DCTSIZE*1], quantptr[DCTSIZE*1]); |
---|
473 | z2 = DEQUANTIZE(inptr[DCTSIZE*3], quantptr[DCTSIZE*3]); |
---|
474 | z3 = DEQUANTIZE(inptr[DCTSIZE*5], quantptr[DCTSIZE*5]); |
---|
475 | |
---|
476 | tmp1 = MULTIPLY(z1 + z2, FIX(0.935414347)); /* (c3+c1-c5)/2 */ |
---|
477 | tmp2 = MULTIPLY(z1 - z2, FIX(0.170262339)); /* (c3+c5-c1)/2 */ |
---|
478 | tmp0 = tmp1 - tmp2; |
---|
479 | tmp1 += tmp2; |
---|
480 | tmp2 = MULTIPLY(z2 + z3, - FIX(1.378756276)); /* -c1 */ |
---|
481 | tmp1 += tmp2; |
---|
482 | z2 = MULTIPLY(z1 + z3, FIX(0.613604268)); /* c5 */ |
---|
483 | tmp0 += z2; |
---|
484 | tmp2 += z2 + MULTIPLY(z3, FIX(1.870828693)); /* c3+c1-c5 */ |
---|
485 | |
---|
486 | /* Final output stage */ |
---|
487 | |
---|
488 | wsptr[7*0] = (int) RIGHT_SHIFT(tmp10 + tmp0, CONST_BITS-PASS1_BITS); |
---|
489 | wsptr[7*6] = (int) RIGHT_SHIFT(tmp10 - tmp0, CONST_BITS-PASS1_BITS); |
---|
490 | wsptr[7*1] = (int) RIGHT_SHIFT(tmp11 + tmp1, CONST_BITS-PASS1_BITS); |
---|
491 | wsptr[7*5] = (int) RIGHT_SHIFT(tmp11 - tmp1, CONST_BITS-PASS1_BITS); |
---|
492 | wsptr[7*2] = (int) RIGHT_SHIFT(tmp12 + tmp2, CONST_BITS-PASS1_BITS); |
---|
493 | wsptr[7*4] = (int) RIGHT_SHIFT(tmp12 - tmp2, CONST_BITS-PASS1_BITS); |
---|
494 | wsptr[7*3] = (int) RIGHT_SHIFT(tmp13, CONST_BITS-PASS1_BITS); |
---|
495 | } |
---|
496 | |
---|
497 | /* Pass 2: process 7 rows from work array, store into output array. */ |
---|
498 | |
---|
499 | wsptr = workspace; |
---|
500 | for (ctr = 0; ctr < 7; ctr++) { |
---|
501 | outptr = output_buf[ctr] + output_col; |
---|
502 | |
---|
503 | /* Even part */ |
---|
504 | |
---|
505 | /* Add fudge factor here for final descale. */ |
---|
506 | tmp13 = (INT32) wsptr[0] + (ONE << (PASS1_BITS+2)); |
---|
507 | tmp13 <<= CONST_BITS; |
---|
508 | |
---|
509 | z1 = (INT32) wsptr[2]; |
---|
510 | z2 = (INT32) wsptr[4]; |
---|
511 | z3 = (INT32) wsptr[6]; |
---|
512 | |
---|
513 | tmp10 = MULTIPLY(z2 - z3, FIX(0.881747734)); /* c4 */ |
---|
514 | tmp12 = MULTIPLY(z1 - z2, FIX(0.314692123)); /* c6 */ |
---|
515 | tmp11 = tmp10 + tmp12 + tmp13 - MULTIPLY(z2, FIX(1.841218003)); /* c2+c4-c6 */ |
---|
516 | tmp0 = z1 + z3; |
---|
517 | z2 -= tmp0; |
---|
518 | tmp0 = MULTIPLY(tmp0, FIX(1.274162392)) + tmp13; /* c2 */ |
---|
519 | tmp10 += tmp0 - MULTIPLY(z3, FIX(0.077722536)); /* c2-c4-c6 */ |
---|
520 | tmp12 += tmp0 - MULTIPLY(z1, FIX(2.470602249)); /* c2+c4+c6 */ |
---|
521 | tmp13 += MULTIPLY(z2, FIX(1.414213562)); /* c0 */ |
---|
522 | |
---|
523 | /* Odd part */ |
---|
524 | |
---|
525 | z1 = (INT32) wsptr[1]; |
---|
526 | z2 = (INT32) wsptr[3]; |
---|
527 | z3 = (INT32) wsptr[5]; |
---|
528 | |
---|
529 | tmp1 = MULTIPLY(z1 + z2, FIX(0.935414347)); /* (c3+c1-c5)/2 */ |
---|
530 | tmp2 = MULTIPLY(z1 - z2, FIX(0.170262339)); /* (c3+c5-c1)/2 */ |
---|
531 | tmp0 = tmp1 - tmp2; |
---|
532 | tmp1 += tmp2; |
---|
533 | tmp2 = MULTIPLY(z2 + z3, - FIX(1.378756276)); /* -c1 */ |
---|
534 | tmp1 += tmp2; |
---|
535 | z2 = MULTIPLY(z1 + z3, FIX(0.613604268)); /* c5 */ |
---|
536 | tmp0 += z2; |
---|
537 | tmp2 += z2 + MULTIPLY(z3, FIX(1.870828693)); /* c3+c1-c5 */ |
---|
538 | |
---|
539 | /* Final output stage */ |
---|
540 | |
---|
541 | outptr[0] = range_limit[(int) RIGHT_SHIFT(tmp10 + tmp0, |
---|
542 | CONST_BITS+PASS1_BITS+3) |
---|
543 | & RANGE_MASK]; |
---|
544 | outptr[6] = range_limit[(int) RIGHT_SHIFT(tmp10 - tmp0, |
---|
545 | CONST_BITS+PASS1_BITS+3) |
---|
546 | & RANGE_MASK]; |
---|
547 | outptr[1] = range_limit[(int) RIGHT_SHIFT(tmp11 + tmp1, |
---|
548 | CONST_BITS+PASS1_BITS+3) |
---|
549 | & RANGE_MASK]; |
---|
550 | outptr[5] = range_limit[(int) RIGHT_SHIFT(tmp11 - tmp1, |
---|
551 | CONST_BITS+PASS1_BITS+3) |
---|
552 | & RANGE_MASK]; |
---|
553 | outptr[2] = range_limit[(int) RIGHT_SHIFT(tmp12 + tmp2, |
---|
554 | CONST_BITS+PASS1_BITS+3) |
---|
555 | & RANGE_MASK]; |
---|
556 | outptr[4] = range_limit[(int) RIGHT_SHIFT(tmp12 - tmp2, |
---|
557 | CONST_BITS+PASS1_BITS+3) |
---|
558 | & RANGE_MASK]; |
---|
559 | outptr[3] = range_limit[(int) RIGHT_SHIFT(tmp13, |
---|
560 | CONST_BITS+PASS1_BITS+3) |
---|
561 | & RANGE_MASK]; |
---|
562 | |
---|
563 | wsptr += 7; /* advance pointer to next row */ |
---|
564 | } |
---|
565 | } |
---|
566 | |
---|
567 | |
---|
568 | /* |
---|
569 | * Perform dequantization and inverse DCT on one block of coefficients, |
---|
570 | * producing a reduced-size 6x6 output block. |
---|
571 | * |
---|
572 | * Optimized algorithm with 3 multiplications in the 1-D kernel. |
---|
573 | * cK represents sqrt(2) * cos(K*pi/12). |
---|
574 | */ |
---|
575 | |
---|
576 | GLOBAL(void) |
---|
577 | jpeg_idct_6x6 (j_decompress_ptr cinfo, jpeg_component_info * compptr, |
---|
578 | JCOEFPTR coef_block, |
---|
579 | JSAMPARRAY output_buf, JDIMENSION output_col) |
---|
580 | { |
---|
581 | INT32 tmp0, tmp1, tmp2, tmp10, tmp11, tmp12; |
---|
582 | INT32 z1, z2, z3; |
---|
583 | JCOEFPTR inptr; |
---|
584 | ISLOW_MULT_TYPE * quantptr; |
---|
585 | int * wsptr; |
---|
586 | JSAMPROW outptr; |
---|
587 | JSAMPLE *range_limit = IDCT_range_limit(cinfo); |
---|
588 | int ctr; |
---|
589 | int workspace[6*6]; /* buffers data between passes */ |
---|
590 | SHIFT_TEMPS |
---|
591 | |
---|
592 | /* Pass 1: process columns from input, store into work array. */ |
---|
593 | |
---|
594 | inptr = coef_block; |
---|
595 | quantptr = (ISLOW_MULT_TYPE *) compptr->dct_table; |
---|
596 | wsptr = workspace; |
---|
597 | for (ctr = 0; ctr < 6; ctr++, inptr++, quantptr++, wsptr++) { |
---|
598 | /* Even part */ |
---|
599 | |
---|
600 | tmp0 = DEQUANTIZE(inptr[DCTSIZE*0], quantptr[DCTSIZE*0]); |
---|
601 | tmp0 <<= CONST_BITS; |
---|
602 | /* Add fudge factor here for final descale. */ |
---|
603 | tmp0 += ONE << (CONST_BITS-PASS1_BITS-1); |
---|
604 | tmp2 = DEQUANTIZE(inptr[DCTSIZE*4], quantptr[DCTSIZE*4]); |
---|
605 | tmp10 = MULTIPLY(tmp2, FIX(0.707106781)); /* c4 */ |
---|
606 | tmp1 = tmp0 + tmp10; |
---|
607 | tmp11 = RIGHT_SHIFT(tmp0 - tmp10 - tmp10, CONST_BITS-PASS1_BITS); |
---|
608 | tmp10 = DEQUANTIZE(inptr[DCTSIZE*2], quantptr[DCTSIZE*2]); |
---|
609 | tmp0 = MULTIPLY(tmp10, FIX(1.224744871)); /* c2 */ |
---|
610 | tmp10 = tmp1 + tmp0; |
---|
611 | tmp12 = tmp1 - tmp0; |
---|
612 | |
---|
613 | /* Odd part */ |
---|
614 | |
---|
615 | z1 = DEQUANTIZE(inptr[DCTSIZE*1], quantptr[DCTSIZE*1]); |
---|
616 | z2 = DEQUANTIZE(inptr[DCTSIZE*3], quantptr[DCTSIZE*3]); |
---|
617 | z3 = DEQUANTIZE(inptr[DCTSIZE*5], quantptr[DCTSIZE*5]); |
---|
618 | tmp1 = MULTIPLY(z1 + z3, FIX(0.366025404)); /* c5 */ |
---|
619 | tmp0 = tmp1 + ((z1 + z2) << CONST_BITS); |
---|
620 | tmp2 = tmp1 + ((z3 - z2) << CONST_BITS); |
---|
621 | tmp1 = (z1 - z2 - z3) << PASS1_BITS; |
---|
622 | |
---|
623 | /* Final output stage */ |
---|
624 | |
---|
625 | wsptr[6*0] = (int) RIGHT_SHIFT(tmp10 + tmp0, CONST_BITS-PASS1_BITS); |
---|
626 | wsptr[6*5] = (int) RIGHT_SHIFT(tmp10 - tmp0, CONST_BITS-PASS1_BITS); |
---|
627 | wsptr[6*1] = (int) (tmp11 + tmp1); |
---|
628 | wsptr[6*4] = (int) (tmp11 - tmp1); |
---|
629 | wsptr[6*2] = (int) RIGHT_SHIFT(tmp12 + tmp2, CONST_BITS-PASS1_BITS); |
---|
630 | wsptr[6*3] = (int) RIGHT_SHIFT(tmp12 - tmp2, CONST_BITS-PASS1_BITS); |
---|
631 | } |
---|
632 | |
---|
633 | /* Pass 2: process 6 rows from work array, store into output array. */ |
---|
634 | |
---|
635 | wsptr = workspace; |
---|
636 | for (ctr = 0; ctr < 6; ctr++) { |
---|
637 | outptr = output_buf[ctr] + output_col; |
---|
638 | |
---|
639 | /* Even part */ |
---|
640 | |
---|
641 | /* Add fudge factor here for final descale. */ |
---|
642 | tmp0 = (INT32) wsptr[0] + (ONE << (PASS1_BITS+2)); |
---|
643 | tmp0 <<= CONST_BITS; |
---|
644 | tmp2 = (INT32) wsptr[4]; |
---|
645 | tmp10 = MULTIPLY(tmp2, FIX(0.707106781)); /* c4 */ |
---|
646 | tmp1 = tmp0 + tmp10; |
---|
647 | tmp11 = tmp0 - tmp10 - tmp10; |
---|
648 | tmp10 = (INT32) wsptr[2]; |
---|
649 | tmp0 = MULTIPLY(tmp10, FIX(1.224744871)); /* c2 */ |
---|
650 | tmp10 = tmp1 + tmp0; |
---|
651 | tmp12 = tmp1 - tmp0; |
---|
652 | |
---|
653 | /* Odd part */ |
---|
654 | |
---|
655 | z1 = (INT32) wsptr[1]; |
---|
656 | z2 = (INT32) wsptr[3]; |
---|
657 | z3 = (INT32) wsptr[5]; |
---|
658 | tmp1 = MULTIPLY(z1 + z3, FIX(0.366025404)); /* c5 */ |
---|
659 | tmp0 = tmp1 + ((z1 + z2) << CONST_BITS); |
---|
660 | tmp2 = tmp1 + ((z3 - z2) << CONST_BITS); |
---|
661 | tmp1 = (z1 - z2 - z3) << CONST_BITS; |
---|
662 | |
---|
663 | /* Final output stage */ |
---|
664 | |
---|
665 | outptr[0] = range_limit[(int) RIGHT_SHIFT(tmp10 + tmp0, |
---|
666 | CONST_BITS+PASS1_BITS+3) |
---|
667 | & RANGE_MASK]; |
---|
668 | outptr[5] = range_limit[(int) RIGHT_SHIFT(tmp10 - tmp0, |
---|
669 | CONST_BITS+PASS1_BITS+3) |
---|
670 | & RANGE_MASK]; |
---|
671 | outptr[1] = range_limit[(int) RIGHT_SHIFT(tmp11 + tmp1, |
---|
672 | CONST_BITS+PASS1_BITS+3) |
---|
673 | & RANGE_MASK]; |
---|
674 | outptr[4] = range_limit[(int) RIGHT_SHIFT(tmp11 - tmp1, |
---|
675 | CONST_BITS+PASS1_BITS+3) |
---|
676 | & RANGE_MASK]; |
---|
677 | outptr[2] = range_limit[(int) RIGHT_SHIFT(tmp12 + tmp2, |
---|
678 | CONST_BITS+PASS1_BITS+3) |
---|
679 | & RANGE_MASK]; |
---|
680 | outptr[3] = range_limit[(int) RIGHT_SHIFT(tmp12 - tmp2, |
---|
681 | CONST_BITS+PASS1_BITS+3) |
---|
682 | & RANGE_MASK]; |
---|
683 | |
---|
684 | wsptr += 6; /* advance pointer to next row */ |
---|
685 | } |
---|
686 | } |
---|
687 | |
---|
688 | |
---|
689 | /* |
---|
690 | * Perform dequantization and inverse DCT on one block of coefficients, |
---|
691 | * producing a reduced-size 5x5 output block. |
---|
692 | * |
---|
693 | * Optimized algorithm with 5 multiplications in the 1-D kernel. |
---|
694 | * cK represents sqrt(2) * cos(K*pi/10). |
---|
695 | */ |
---|
696 | |
---|
697 | GLOBAL(void) |
---|
698 | jpeg_idct_5x5 (j_decompress_ptr cinfo, jpeg_component_info * compptr, |
---|
699 | JCOEFPTR coef_block, |
---|
700 | JSAMPARRAY output_buf, JDIMENSION output_col) |
---|
701 | { |
---|
702 | INT32 tmp0, tmp1, tmp10, tmp11, tmp12; |
---|
703 | INT32 z1, z2, z3; |
---|
704 | JCOEFPTR inptr; |
---|
705 | ISLOW_MULT_TYPE * quantptr; |
---|
706 | int * wsptr; |
---|
707 | JSAMPROW outptr; |
---|
708 | JSAMPLE *range_limit = IDCT_range_limit(cinfo); |
---|
709 | int ctr; |
---|
710 | int workspace[5*5]; /* buffers data between passes */ |
---|
711 | SHIFT_TEMPS |
---|
712 | |
---|
713 | /* Pass 1: process columns from input, store into work array. */ |
---|
714 | |
---|
715 | inptr = coef_block; |
---|
716 | quantptr = (ISLOW_MULT_TYPE *) compptr->dct_table; |
---|
717 | wsptr = workspace; |
---|
718 | for (ctr = 0; ctr < 5; ctr++, inptr++, quantptr++, wsptr++) { |
---|
719 | /* Even part */ |
---|
720 | |
---|
721 | tmp12 = DEQUANTIZE(inptr[DCTSIZE*0], quantptr[DCTSIZE*0]); |
---|
722 | tmp12 <<= CONST_BITS; |
---|
723 | /* Add fudge factor here for final descale. */ |
---|
724 | tmp12 += ONE << (CONST_BITS-PASS1_BITS-1); |
---|
725 | tmp0 = DEQUANTIZE(inptr[DCTSIZE*2], quantptr[DCTSIZE*2]); |
---|
726 | tmp1 = DEQUANTIZE(inptr[DCTSIZE*4], quantptr[DCTSIZE*4]); |
---|
727 | z1 = MULTIPLY(tmp0 + tmp1, FIX(0.790569415)); /* (c2+c4)/2 */ |
---|
728 | z2 = MULTIPLY(tmp0 - tmp1, FIX(0.353553391)); /* (c2-c4)/2 */ |
---|
729 | z3 = tmp12 + z2; |
---|
730 | tmp10 = z3 + z1; |
---|
731 | tmp11 = z3 - z1; |
---|
732 | tmp12 -= z2 << 2; |
---|
733 | |
---|
734 | /* Odd part */ |
---|
735 | |
---|
736 | z2 = DEQUANTIZE(inptr[DCTSIZE*1], quantptr[DCTSIZE*1]); |
---|
737 | z3 = DEQUANTIZE(inptr[DCTSIZE*3], quantptr[DCTSIZE*3]); |
---|
738 | |
---|
739 | z1 = MULTIPLY(z2 + z3, FIX(0.831253876)); /* c3 */ |
---|
740 | tmp0 = z1 + MULTIPLY(z2, FIX(0.513743148)); /* c1-c3 */ |
---|
741 | tmp1 = z1 - MULTIPLY(z3, FIX(2.176250899)); /* c1+c3 */ |
---|
742 | |
---|
743 | /* Final output stage */ |
---|
744 | |
---|
745 | wsptr[5*0] = (int) RIGHT_SHIFT(tmp10 + tmp0, CONST_BITS-PASS1_BITS); |
---|
746 | wsptr[5*4] = (int) RIGHT_SHIFT(tmp10 - tmp0, CONST_BITS-PASS1_BITS); |
---|
747 | wsptr[5*1] = (int) RIGHT_SHIFT(tmp11 + tmp1, CONST_BITS-PASS1_BITS); |
---|
748 | wsptr[5*3] = (int) RIGHT_SHIFT(tmp11 - tmp1, CONST_BITS-PASS1_BITS); |
---|
749 | wsptr[5*2] = (int) RIGHT_SHIFT(tmp12, CONST_BITS-PASS1_BITS); |
---|
750 | } |
---|
751 | |
---|
752 | /* Pass 2: process 5 rows from work array, store into output array. */ |
---|
753 | |
---|
754 | wsptr = workspace; |
---|
755 | for (ctr = 0; ctr < 5; ctr++) { |
---|
756 | outptr = output_buf[ctr] + output_col; |
---|
757 | |
---|
758 | /* Even part */ |
---|
759 | |
---|
760 | /* Add fudge factor here for final descale. */ |
---|
761 | tmp12 = (INT32) wsptr[0] + (ONE << (PASS1_BITS+2)); |
---|
762 | tmp12 <<= CONST_BITS; |
---|
763 | tmp0 = (INT32) wsptr[2]; |
---|
764 | tmp1 = (INT32) wsptr[4]; |
---|
765 | z1 = MULTIPLY(tmp0 + tmp1, FIX(0.790569415)); /* (c2+c4)/2 */ |
---|
766 | z2 = MULTIPLY(tmp0 - tmp1, FIX(0.353553391)); /* (c2-c4)/2 */ |
---|
767 | z3 = tmp12 + z2; |
---|
768 | tmp10 = z3 + z1; |
---|
769 | tmp11 = z3 - z1; |
---|
770 | tmp12 -= z2 << 2; |
---|
771 | |
---|
772 | /* Odd part */ |
---|
773 | |
---|
774 | z2 = (INT32) wsptr[1]; |
---|
775 | z3 = (INT32) wsptr[3]; |
---|
776 | |
---|
777 | z1 = MULTIPLY(z2 + z3, FIX(0.831253876)); /* c3 */ |
---|
778 | tmp0 = z1 + MULTIPLY(z2, FIX(0.513743148)); /* c1-c3 */ |
---|
779 | tmp1 = z1 - MULTIPLY(z3, FIX(2.176250899)); /* c1+c3 */ |
---|
780 | |
---|
781 | /* Final output stage */ |
---|
782 | |
---|
783 | outptr[0] = range_limit[(int) RIGHT_SHIFT(tmp10 + tmp0, |
---|
784 | CONST_BITS+PASS1_BITS+3) |
---|
785 | & RANGE_MASK]; |
---|
786 | outptr[4] = range_limit[(int) RIGHT_SHIFT(tmp10 - tmp0, |
---|
787 | CONST_BITS+PASS1_BITS+3) |
---|
788 | & RANGE_MASK]; |
---|
789 | outptr[1] = range_limit[(int) RIGHT_SHIFT(tmp11 + tmp1, |
---|
790 | CONST_BITS+PASS1_BITS+3) |
---|
791 | & RANGE_MASK]; |
---|
792 | outptr[3] = range_limit[(int) RIGHT_SHIFT(tmp11 - tmp1, |
---|
793 | CONST_BITS+PASS1_BITS+3) |
---|
794 | & RANGE_MASK]; |
---|
795 | outptr[2] = range_limit[(int) RIGHT_SHIFT(tmp12, |
---|
796 | CONST_BITS+PASS1_BITS+3) |
---|
797 | & RANGE_MASK]; |
---|
798 | |
---|
799 | wsptr += 5; /* advance pointer to next row */ |
---|
800 | } |
---|
801 | } |
---|
802 | |
---|
803 | |
---|
804 | /* |
---|
805 | * Perform dequantization and inverse DCT on one block of coefficients, |
---|
806 | * producing a reduced-size 4x4 output block. |
---|
807 | * |
---|
808 | * Optimized algorithm with 3 multiplications in the 1-D kernel. |
---|
809 | * cK represents sqrt(2) * cos(K*pi/16) [refers to 8-point IDCT]. |
---|
810 | */ |
---|
811 | |
---|
812 | GLOBAL(void) |
---|
813 | jpeg_idct_4x4 (j_decompress_ptr cinfo, jpeg_component_info * compptr, |
---|
814 | JCOEFPTR coef_block, |
---|
815 | JSAMPARRAY output_buf, JDIMENSION output_col) |
---|
816 | { |
---|
817 | INT32 tmp0, tmp2, tmp10, tmp12; |
---|
818 | INT32 z1, z2, z3; |
---|
819 | JCOEFPTR inptr; |
---|
820 | ISLOW_MULT_TYPE * quantptr; |
---|
821 | int * wsptr; |
---|
822 | JSAMPROW outptr; |
---|
823 | JSAMPLE *range_limit = IDCT_range_limit(cinfo); |
---|
824 | int ctr; |
---|
825 | int workspace[4*4]; /* buffers data between passes */ |
---|
826 | SHIFT_TEMPS |
---|
827 | |
---|
828 | /* Pass 1: process columns from input, store into work array. */ |
---|
829 | |
---|
830 | inptr = coef_block; |
---|
831 | quantptr = (ISLOW_MULT_TYPE *) compptr->dct_table; |
---|
832 | wsptr = workspace; |
---|
833 | for (ctr = 0; ctr < 4; ctr++, inptr++, quantptr++, wsptr++) { |
---|
834 | /* Even part */ |
---|
835 | |
---|
836 | tmp0 = DEQUANTIZE(inptr[DCTSIZE*0], quantptr[DCTSIZE*0]); |
---|
837 | tmp2 = DEQUANTIZE(inptr[DCTSIZE*2], quantptr[DCTSIZE*2]); |
---|
838 | |
---|
839 | tmp10 = (tmp0 + tmp2) << PASS1_BITS; |
---|
840 | tmp12 = (tmp0 - tmp2) << PASS1_BITS; |
---|
841 | |
---|
842 | /* Odd part */ |
---|
843 | /* Same rotation as in the even part of the 8x8 LL&M IDCT */ |
---|
844 | |
---|
845 | z2 = DEQUANTIZE(inptr[DCTSIZE*1], quantptr[DCTSIZE*1]); |
---|
846 | z3 = DEQUANTIZE(inptr[DCTSIZE*3], quantptr[DCTSIZE*3]); |
---|
847 | |
---|
848 | z1 = MULTIPLY(z2 + z3, FIX_0_541196100); /* c6 */ |
---|
849 | /* Add fudge factor here for final descale. */ |
---|
850 | z1 += ONE << (CONST_BITS-PASS1_BITS-1); |
---|
851 | tmp0 = RIGHT_SHIFT(z1 + MULTIPLY(z2, FIX_0_765366865), /* c2-c6 */ |
---|
852 | CONST_BITS-PASS1_BITS); |
---|
853 | tmp2 = RIGHT_SHIFT(z1 - MULTIPLY(z3, FIX_1_847759065), /* c2+c6 */ |
---|
854 | CONST_BITS-PASS1_BITS); |
---|
855 | |
---|
856 | /* Final output stage */ |
---|
857 | |
---|
858 | wsptr[4*0] = (int) (tmp10 + tmp0); |
---|
859 | wsptr[4*3] = (int) (tmp10 - tmp0); |
---|
860 | wsptr[4*1] = (int) (tmp12 + tmp2); |
---|
861 | wsptr[4*2] = (int) (tmp12 - tmp2); |
---|
862 | } |
---|
863 | |
---|
864 | /* Pass 2: process 4 rows from work array, store into output array. */ |
---|
865 | |
---|
866 | wsptr = workspace; |
---|
867 | for (ctr = 0; ctr < 4; ctr++) { |
---|
868 | outptr = output_buf[ctr] + output_col; |
---|
869 | |
---|
870 | /* Even part */ |
---|
871 | |
---|
872 | /* Add fudge factor here for final descale. */ |
---|
873 | tmp0 = (INT32) wsptr[0] + (ONE << (PASS1_BITS+2)); |
---|
874 | tmp2 = (INT32) wsptr[2]; |
---|
875 | |
---|
876 | tmp10 = (tmp0 + tmp2) << CONST_BITS; |
---|
877 | tmp12 = (tmp0 - tmp2) << CONST_BITS; |
---|
878 | |
---|
879 | /* Odd part */ |
---|
880 | /* Same rotation as in the even part of the 8x8 LL&M IDCT */ |
---|
881 | |
---|
882 | z2 = (INT32) wsptr[1]; |
---|
883 | z3 = (INT32) wsptr[3]; |
---|
884 | |
---|
885 | z1 = MULTIPLY(z2 + z3, FIX_0_541196100); /* c6 */ |
---|
886 | tmp0 = z1 + MULTIPLY(z2, FIX_0_765366865); /* c2-c6 */ |
---|
887 | tmp2 = z1 - MULTIPLY(z3, FIX_1_847759065); /* c2+c6 */ |
---|
888 | |
---|
889 | /* Final output stage */ |
---|
890 | |
---|
891 | outptr[0] = range_limit[(int) RIGHT_SHIFT(tmp10 + tmp0, |
---|
892 | CONST_BITS+PASS1_BITS+3) |
---|
893 | & RANGE_MASK]; |
---|
894 | outptr[3] = range_limit[(int) RIGHT_SHIFT(tmp10 - tmp0, |
---|
895 | CONST_BITS+PASS1_BITS+3) |
---|
896 | & RANGE_MASK]; |
---|
897 | outptr[1] = range_limit[(int) RIGHT_SHIFT(tmp12 + tmp2, |
---|
898 | CONST_BITS+PASS1_BITS+3) |
---|
899 | & RANGE_MASK]; |
---|
900 | outptr[2] = range_limit[(int) RIGHT_SHIFT(tmp12 - tmp2, |
---|
901 | CONST_BITS+PASS1_BITS+3) |
---|
902 | & RANGE_MASK]; |
---|
903 | |
---|
904 | wsptr += 4; /* advance pointer to next row */ |
---|
905 | } |
---|
906 | } |
---|
907 | |
---|
908 | |
---|
909 | /* |
---|
910 | * Perform dequantization and inverse DCT on one block of coefficients, |
---|
911 | * producing a reduced-size 3x3 output block. |
---|
912 | * |
---|
913 | * Optimized algorithm with 2 multiplications in the 1-D kernel. |
---|
914 | * cK represents sqrt(2) * cos(K*pi/6). |
---|
915 | */ |
---|
916 | |
---|
917 | GLOBAL(void) |
---|
918 | jpeg_idct_3x3 (j_decompress_ptr cinfo, jpeg_component_info * compptr, |
---|
919 | JCOEFPTR coef_block, |
---|
920 | JSAMPARRAY output_buf, JDIMENSION output_col) |
---|
921 | { |
---|
922 | INT32 tmp0, tmp2, tmp10, tmp12; |
---|
923 | JCOEFPTR inptr; |
---|
924 | ISLOW_MULT_TYPE * quantptr; |
---|
925 | int * wsptr; |
---|
926 | JSAMPROW outptr; |
---|
927 | JSAMPLE *range_limit = IDCT_range_limit(cinfo); |
---|
928 | int ctr; |
---|
929 | int workspace[3*3]; /* buffers data between passes */ |
---|
930 | SHIFT_TEMPS |
---|
931 | |
---|
932 | /* Pass 1: process columns from input, store into work array. */ |
---|
933 | |
---|
934 | inptr = coef_block; |
---|
935 | quantptr = (ISLOW_MULT_TYPE *) compptr->dct_table; |
---|
936 | wsptr = workspace; |
---|
937 | for (ctr = 0; ctr < 3; ctr++, inptr++, quantptr++, wsptr++) { |
---|
938 | /* Even part */ |
---|
939 | |
---|
940 | tmp0 = DEQUANTIZE(inptr[DCTSIZE*0], quantptr[DCTSIZE*0]); |
---|
941 | tmp0 <<= CONST_BITS; |
---|
942 | /* Add fudge factor here for final descale. */ |
---|
943 | tmp0 += ONE << (CONST_BITS-PASS1_BITS-1); |
---|
944 | tmp2 = DEQUANTIZE(inptr[DCTSIZE*2], quantptr[DCTSIZE*2]); |
---|
945 | tmp12 = MULTIPLY(tmp2, FIX(0.707106781)); /* c2 */ |
---|
946 | tmp10 = tmp0 + tmp12; |
---|
947 | tmp2 = tmp0 - tmp12 - tmp12; |
---|
948 | |
---|
949 | /* Odd part */ |
---|
950 | |
---|
951 | tmp12 = DEQUANTIZE(inptr[DCTSIZE*1], quantptr[DCTSIZE*1]); |
---|
952 | tmp0 = MULTIPLY(tmp12, FIX(1.224744871)); /* c1 */ |
---|
953 | |
---|
954 | /* Final output stage */ |
---|
955 | |
---|
956 | wsptr[3*0] = (int) RIGHT_SHIFT(tmp10 + tmp0, CONST_BITS-PASS1_BITS); |
---|
957 | wsptr[3*2] = (int) RIGHT_SHIFT(tmp10 - tmp0, CONST_BITS-PASS1_BITS); |
---|
958 | wsptr[3*1] = (int) RIGHT_SHIFT(tmp2, CONST_BITS-PASS1_BITS); |
---|
959 | } |
---|
960 | |
---|
961 | /* Pass 2: process 3 rows from work array, store into output array. */ |
---|
962 | |
---|
963 | wsptr = workspace; |
---|
964 | for (ctr = 0; ctr < 3; ctr++) { |
---|
965 | outptr = output_buf[ctr] + output_col; |
---|
966 | |
---|
967 | /* Even part */ |
---|
968 | |
---|
969 | /* Add fudge factor here for final descale. */ |
---|
970 | tmp0 = (INT32) wsptr[0] + (ONE << (PASS1_BITS+2)); |
---|
971 | tmp0 <<= CONST_BITS; |
---|
972 | tmp2 = (INT32) wsptr[2]; |
---|
973 | tmp12 = MULTIPLY(tmp2, FIX(0.707106781)); /* c2 */ |
---|
974 | tmp10 = tmp0 + tmp12; |
---|
975 | tmp2 = tmp0 - tmp12 - tmp12; |
---|
976 | |
---|
977 | /* Odd part */ |
---|
978 | |
---|
979 | tmp12 = (INT32) wsptr[1]; |
---|
980 | tmp0 = MULTIPLY(tmp12, FIX(1.224744871)); /* c1 */ |
---|
981 | |
---|
982 | /* Final output stage */ |
---|
983 | |
---|
984 | outptr[0] = range_limit[(int) RIGHT_SHIFT(tmp10 + tmp0, |
---|
985 | CONST_BITS+PASS1_BITS+3) |
---|
986 | & RANGE_MASK]; |
---|
987 | outptr[2] = range_limit[(int) RIGHT_SHIFT(tmp10 - tmp0, |
---|
988 | CONST_BITS+PASS1_BITS+3) |
---|
989 | & RANGE_MASK]; |
---|
990 | outptr[1] = range_limit[(int) RIGHT_SHIFT(tmp2, |
---|
991 | CONST_BITS+PASS1_BITS+3) |
---|
992 | & RANGE_MASK]; |
---|
993 | |
---|
994 | wsptr += 3; /* advance pointer to next row */ |
---|
995 | } |
---|
996 | } |
---|
997 | |
---|
998 | |
---|
999 | /* |
---|
1000 | * Perform dequantization and inverse DCT on one block of coefficients, |
---|
1001 | * producing a reduced-size 2x2 output block. |
---|
1002 | * |
---|
1003 | * Multiplication-less algorithm. |
---|
1004 | */ |
---|
1005 | |
---|
1006 | GLOBAL(void) |
---|
1007 | jpeg_idct_2x2 (j_decompress_ptr cinfo, jpeg_component_info * compptr, |
---|
1008 | JCOEFPTR coef_block, |
---|
1009 | JSAMPARRAY output_buf, JDIMENSION output_col) |
---|
1010 | { |
---|
1011 | INT32 tmp0, tmp1, tmp2, tmp3, tmp4, tmp5; |
---|
1012 | ISLOW_MULT_TYPE * quantptr; |
---|
1013 | JSAMPROW outptr; |
---|
1014 | JSAMPLE *range_limit = IDCT_range_limit(cinfo); |
---|
1015 | SHIFT_TEMPS |
---|
1016 | |
---|
1017 | /* Pass 1: process columns from input. */ |
---|
1018 | |
---|
1019 | quantptr = (ISLOW_MULT_TYPE *) compptr->dct_table; |
---|
1020 | |
---|
1021 | /* Column 0 */ |
---|
1022 | tmp4 = DEQUANTIZE(coef_block[DCTSIZE*0], quantptr[DCTSIZE*0]); |
---|
1023 | tmp5 = DEQUANTIZE(coef_block[DCTSIZE*1], quantptr[DCTSIZE*1]); |
---|
1024 | /* Add fudge factor here for final descale. */ |
---|
1025 | tmp4 += ONE << 2; |
---|
1026 | |
---|
1027 | tmp0 = tmp4 + tmp5; |
---|
1028 | tmp2 = tmp4 - tmp5; |
---|
1029 | |
---|
1030 | /* Column 1 */ |
---|
1031 | tmp4 = DEQUANTIZE(coef_block[DCTSIZE*0+1], quantptr[DCTSIZE*0+1]); |
---|
1032 | tmp5 = DEQUANTIZE(coef_block[DCTSIZE*1+1], quantptr[DCTSIZE*1+1]); |
---|
1033 | |
---|
1034 | tmp1 = tmp4 + tmp5; |
---|
1035 | tmp3 = tmp4 - tmp5; |
---|
1036 | |
---|
1037 | /* Pass 2: process 2 rows, store into output array. */ |
---|
1038 | |
---|
1039 | /* Row 0 */ |
---|
1040 | outptr = output_buf[0] + output_col; |
---|
1041 | |
---|
1042 | outptr[0] = range_limit[(int) RIGHT_SHIFT(tmp0 + tmp1, 3) & RANGE_MASK]; |
---|
1043 | outptr[1] = range_limit[(int) RIGHT_SHIFT(tmp0 - tmp1, 3) & RANGE_MASK]; |
---|
1044 | |
---|
1045 | /* Row 1 */ |
---|
1046 | outptr = output_buf[1] + output_col; |
---|
1047 | |
---|
1048 | outptr[0] = range_limit[(int) RIGHT_SHIFT(tmp2 + tmp3, 3) & RANGE_MASK]; |
---|
1049 | outptr[1] = range_limit[(int) RIGHT_SHIFT(tmp2 - tmp3, 3) & RANGE_MASK]; |
---|
1050 | } |
---|
1051 | |
---|
1052 | |
---|
1053 | /* |
---|
1054 | * Perform dequantization and inverse DCT on one block of coefficients, |
---|
1055 | * producing a reduced-size 1x1 output block. |
---|
1056 | * |
---|
1057 | * We hardly need an inverse DCT routine for this: just take the |
---|
1058 | * average pixel value, which is one-eighth of the DC coefficient. |
---|
1059 | */ |
---|
1060 | |
---|
1061 | GLOBAL(void) |
---|
1062 | jpeg_idct_1x1 (j_decompress_ptr cinfo, jpeg_component_info * compptr, |
---|
1063 | JCOEFPTR coef_block, |
---|
1064 | JSAMPARRAY output_buf, JDIMENSION output_col) |
---|
1065 | { |
---|
1066 | int dcval; |
---|
1067 | ISLOW_MULT_TYPE * quantptr; |
---|
1068 | JSAMPLE *range_limit = IDCT_range_limit(cinfo); |
---|
1069 | SHIFT_TEMPS |
---|
1070 | |
---|
1071 | /* 1x1 is trivial: just take the DC coefficient divided by 8. */ |
---|
1072 | quantptr = (ISLOW_MULT_TYPE *) compptr->dct_table; |
---|
1073 | dcval = DEQUANTIZE(coef_block[0], quantptr[0]); |
---|
1074 | dcval = (int) DESCALE((INT32) dcval, 3); |
---|
1075 | |
---|
1076 | output_buf[0][output_col] = range_limit[dcval & RANGE_MASK]; |
---|
1077 | } |
---|
1078 | |
---|
1079 | |
---|
1080 | /* |
---|
1081 | * Perform dequantization and inverse DCT on one block of coefficients, |
---|
1082 | * producing a 9x9 output block. |
---|
1083 | * |
---|
1084 | * Optimized algorithm with 10 multiplications in the 1-D kernel. |
---|
1085 | * cK represents sqrt(2) * cos(K*pi/18). |
---|
1086 | */ |
---|
1087 | |
---|
1088 | GLOBAL(void) |
---|
1089 | jpeg_idct_9x9 (j_decompress_ptr cinfo, jpeg_component_info * compptr, |
---|
1090 | JCOEFPTR coef_block, |
---|
1091 | JSAMPARRAY output_buf, JDIMENSION output_col) |
---|
1092 | { |
---|
1093 | INT32 tmp0, tmp1, tmp2, tmp3, tmp10, tmp11, tmp12, tmp13, tmp14; |
---|
1094 | INT32 z1, z2, z3, z4; |
---|
1095 | JCOEFPTR inptr; |
---|
1096 | ISLOW_MULT_TYPE * quantptr; |
---|
1097 | int * wsptr; |
---|
1098 | JSAMPROW outptr; |
---|
1099 | JSAMPLE *range_limit = IDCT_range_limit(cinfo); |
---|
1100 | int ctr; |
---|
1101 | int workspace[8*9]; /* buffers data between passes */ |
---|
1102 | SHIFT_TEMPS |
---|
1103 | |
---|
1104 | /* Pass 1: process columns from input, store into work array. */ |
---|
1105 | |
---|
1106 | inptr = coef_block; |
---|
1107 | quantptr = (ISLOW_MULT_TYPE *) compptr->dct_table; |
---|
1108 | wsptr = workspace; |
---|
1109 | for (ctr = 0; ctr < 8; ctr++, inptr++, quantptr++, wsptr++) { |
---|
1110 | /* Even part */ |
---|
1111 | |
---|
1112 | tmp0 = DEQUANTIZE(inptr[DCTSIZE*0], quantptr[DCTSIZE*0]); |
---|
1113 | tmp0 <<= CONST_BITS; |
---|
1114 | /* Add fudge factor here for final descale. */ |
---|
1115 | tmp0 += ONE << (CONST_BITS-PASS1_BITS-1); |
---|
1116 | |
---|
1117 | z1 = DEQUANTIZE(inptr[DCTSIZE*2], quantptr[DCTSIZE*2]); |
---|
1118 | z2 = DEQUANTIZE(inptr[DCTSIZE*4], quantptr[DCTSIZE*4]); |
---|
1119 | z3 = DEQUANTIZE(inptr[DCTSIZE*6], quantptr[DCTSIZE*6]); |
---|
1120 | |
---|
1121 | tmp3 = MULTIPLY(z3, FIX(0.707106781)); /* c6 */ |
---|
1122 | tmp1 = tmp0 + tmp3; |
---|
1123 | tmp2 = tmp0 - tmp3 - tmp3; |
---|
1124 | |
---|
1125 | tmp0 = MULTIPLY(z1 - z2, FIX(0.707106781)); /* c6 */ |
---|
1126 | tmp11 = tmp2 + tmp0; |
---|
1127 | tmp14 = tmp2 - tmp0 - tmp0; |
---|
1128 | |
---|
1129 | tmp0 = MULTIPLY(z1 + z2, FIX(1.328926049)); /* c2 */ |
---|
1130 | tmp2 = MULTIPLY(z1, FIX(1.083350441)); /* c4 */ |
---|
1131 | tmp3 = MULTIPLY(z2, FIX(0.245575608)); /* c8 */ |
---|
1132 | |
---|
1133 | tmp10 = tmp1 + tmp0 - tmp3; |
---|
1134 | tmp12 = tmp1 - tmp0 + tmp2; |
---|
1135 | tmp13 = tmp1 - tmp2 + tmp3; |
---|
1136 | |
---|
1137 | /* Odd part */ |
---|
1138 | |
---|
1139 | z1 = DEQUANTIZE(inptr[DCTSIZE*1], quantptr[DCTSIZE*1]); |
---|
1140 | z2 = DEQUANTIZE(inptr[DCTSIZE*3], quantptr[DCTSIZE*3]); |
---|
1141 | z3 = DEQUANTIZE(inptr[DCTSIZE*5], quantptr[DCTSIZE*5]); |
---|
1142 | z4 = DEQUANTIZE(inptr[DCTSIZE*7], quantptr[DCTSIZE*7]); |
---|
1143 | |
---|
1144 | z2 = MULTIPLY(z2, - FIX(1.224744871)); /* -c3 */ |
---|
1145 | |
---|
1146 | tmp2 = MULTIPLY(z1 + z3, FIX(0.909038955)); /* c5 */ |
---|
1147 | tmp3 = MULTIPLY(z1 + z4, FIX(0.483689525)); /* c7 */ |
---|
1148 | tmp0 = tmp2 + tmp3 - z2; |
---|
1149 | tmp1 = MULTIPLY(z3 - z4, FIX(1.392728481)); /* c1 */ |
---|
1150 | tmp2 += z2 - tmp1; |
---|
1151 | tmp3 += z2 + tmp1; |
---|
1152 | tmp1 = MULTIPLY(z1 - z3 - z4, FIX(1.224744871)); /* c3 */ |
---|
1153 | |
---|
1154 | /* Final output stage */ |
---|
1155 | |
---|
1156 | wsptr[8*0] = (int) RIGHT_SHIFT(tmp10 + tmp0, CONST_BITS-PASS1_BITS); |
---|
1157 | wsptr[8*8] = (int) RIGHT_SHIFT(tmp10 - tmp0, CONST_BITS-PASS1_BITS); |
---|
1158 | wsptr[8*1] = (int) RIGHT_SHIFT(tmp11 + tmp1, CONST_BITS-PASS1_BITS); |
---|
1159 | wsptr[8*7] = (int) RIGHT_SHIFT(tmp11 - tmp1, CONST_BITS-PASS1_BITS); |
---|
1160 | wsptr[8*2] = (int) RIGHT_SHIFT(tmp12 + tmp2, CONST_BITS-PASS1_BITS); |
---|
1161 | wsptr[8*6] = (int) RIGHT_SHIFT(tmp12 - tmp2, CONST_BITS-PASS1_BITS); |
---|
1162 | wsptr[8*3] = (int) RIGHT_SHIFT(tmp13 + tmp3, CONST_BITS-PASS1_BITS); |
---|
1163 | wsptr[8*5] = (int) RIGHT_SHIFT(tmp13 - tmp3, CONST_BITS-PASS1_BITS); |
---|
1164 | wsptr[8*4] = (int) RIGHT_SHIFT(tmp14, CONST_BITS-PASS1_BITS); |
---|
1165 | } |
---|
1166 | |
---|
1167 | /* Pass 2: process 9 rows from work array, store into output array. */ |
---|
1168 | |
---|
1169 | wsptr = workspace; |
---|
1170 | for (ctr = 0; ctr < 9; ctr++) { |
---|
1171 | outptr = output_buf[ctr] + output_col; |
---|
1172 | |
---|
1173 | /* Even part */ |
---|
1174 | |
---|
1175 | /* Add fudge factor here for final descale. */ |
---|
1176 | tmp0 = (INT32) wsptr[0] + (ONE << (PASS1_BITS+2)); |
---|
1177 | tmp0 <<= CONST_BITS; |
---|
1178 | |
---|
1179 | z1 = (INT32) wsptr[2]; |
---|
1180 | z2 = (INT32) wsptr[4]; |
---|
1181 | z3 = (INT32) wsptr[6]; |
---|
1182 | |
---|
1183 | tmp3 = MULTIPLY(z3, FIX(0.707106781)); /* c6 */ |
---|
1184 | tmp1 = tmp0 + tmp3; |
---|
1185 | tmp2 = tmp0 - tmp3 - tmp3; |
---|
1186 | |
---|
1187 | tmp0 = MULTIPLY(z1 - z2, FIX(0.707106781)); /* c6 */ |
---|
1188 | tmp11 = tmp2 + tmp0; |
---|
1189 | tmp14 = tmp2 - tmp0 - tmp0; |
---|
1190 | |
---|
1191 | tmp0 = MULTIPLY(z1 + z2, FIX(1.328926049)); /* c2 */ |
---|
1192 | tmp2 = MULTIPLY(z1, FIX(1.083350441)); /* c4 */ |
---|
1193 | tmp3 = MULTIPLY(z2, FIX(0.245575608)); /* c8 */ |
---|
1194 | |
---|
1195 | tmp10 = tmp1 + tmp0 - tmp3; |
---|
1196 | tmp12 = tmp1 - tmp0 + tmp2; |
---|
1197 | tmp13 = tmp1 - tmp2 + tmp3; |
---|
1198 | |
---|
1199 | /* Odd part */ |
---|
1200 | |
---|
1201 | z1 = (INT32) wsptr[1]; |
---|
1202 | z2 = (INT32) wsptr[3]; |
---|
1203 | z3 = (INT32) wsptr[5]; |
---|
1204 | z4 = (INT32) wsptr[7]; |
---|
1205 | |
---|
1206 | z2 = MULTIPLY(z2, - FIX(1.224744871)); /* -c3 */ |
---|
1207 | |
---|
1208 | tmp2 = MULTIPLY(z1 + z3, FIX(0.909038955)); /* c5 */ |
---|
1209 | tmp3 = MULTIPLY(z1 + z4, FIX(0.483689525)); /* c7 */ |
---|
1210 | tmp0 = tmp2 + tmp3 - z2; |
---|
1211 | tmp1 = MULTIPLY(z3 - z4, FIX(1.392728481)); /* c1 */ |
---|
1212 | tmp2 += z2 - tmp1; |
---|
1213 | tmp3 += z2 + tmp1; |
---|
1214 | tmp1 = MULTIPLY(z1 - z3 - z4, FIX(1.224744871)); /* c3 */ |
---|
1215 | |
---|
1216 | /* Final output stage */ |
---|
1217 | |
---|
1218 | outptr[0] = range_limit[(int) RIGHT_SHIFT(tmp10 + tmp0, |
---|
1219 | CONST_BITS+PASS1_BITS+3) |
---|
1220 | & RANGE_MASK]; |
---|
1221 | outptr[8] = range_limit[(int) RIGHT_SHIFT(tmp10 - tmp0, |
---|
1222 | CONST_BITS+PASS1_BITS+3) |
---|
1223 | & RANGE_MASK]; |
---|
1224 | outptr[1] = range_limit[(int) RIGHT_SHIFT(tmp11 + tmp1, |
---|
1225 | CONST_BITS+PASS1_BITS+3) |
---|
1226 | & RANGE_MASK]; |
---|
1227 | outptr[7] = range_limit[(int) RIGHT_SHIFT(tmp11 - tmp1, |
---|
1228 | CONST_BITS+PASS1_BITS+3) |
---|
1229 | & RANGE_MASK]; |
---|
1230 | outptr[2] = range_limit[(int) RIGHT_SHIFT(tmp12 + tmp2, |
---|
1231 | CONST_BITS+PASS1_BITS+3) |
---|
1232 | & RANGE_MASK]; |
---|
1233 | outptr[6] = range_limit[(int) RIGHT_SHIFT(tmp12 - tmp2, |
---|
1234 | CONST_BITS+PASS1_BITS+3) |
---|
1235 | & RANGE_MASK]; |
---|
1236 | outptr[3] = range_limit[(int) RIGHT_SHIFT(tmp13 + tmp3, |
---|
1237 | CONST_BITS+PASS1_BITS+3) |
---|
1238 | & RANGE_MASK]; |
---|
1239 | outptr[5] = range_limit[(int) RIGHT_SHIFT(tmp13 - tmp3, |
---|
1240 | CONST_BITS+PASS1_BITS+3) |
---|
1241 | & RANGE_MASK]; |
---|
1242 | outptr[4] = range_limit[(int) RIGHT_SHIFT(tmp14, |
---|
1243 | CONST_BITS+PASS1_BITS+3) |
---|
1244 | & RANGE_MASK]; |
---|
1245 | |
---|
1246 | wsptr += 8; /* advance pointer to next row */ |
---|
1247 | } |
---|
1248 | } |
---|
1249 | |
---|
1250 | |
---|
1251 | /* |
---|
1252 | * Perform dequantization and inverse DCT on one block of coefficients, |
---|
1253 | * producing a 10x10 output block. |
---|
1254 | * |
---|
1255 | * Optimized algorithm with 12 multiplications in the 1-D kernel. |
---|
1256 | * cK represents sqrt(2) * cos(K*pi/20). |
---|
1257 | */ |
---|
1258 | |
---|
1259 | GLOBAL(void) |
---|
1260 | jpeg_idct_10x10 (j_decompress_ptr cinfo, jpeg_component_info * compptr, |
---|
1261 | JCOEFPTR coef_block, |
---|
1262 | JSAMPARRAY output_buf, JDIMENSION output_col) |
---|
1263 | { |
---|
1264 | INT32 tmp10, tmp11, tmp12, tmp13, tmp14; |
---|
1265 | INT32 tmp20, tmp21, tmp22, tmp23, tmp24; |
---|
1266 | INT32 z1, z2, z3, z4, z5; |
---|
1267 | JCOEFPTR inptr; |
---|
1268 | ISLOW_MULT_TYPE * quantptr; |
---|
1269 | int * wsptr; |
---|
1270 | JSAMPROW outptr; |
---|
1271 | JSAMPLE *range_limit = IDCT_range_limit(cinfo); |
---|
1272 | int ctr; |
---|
1273 | int workspace[8*10]; /* buffers data between passes */ |
---|
1274 | SHIFT_TEMPS |
---|
1275 | |
---|
1276 | /* Pass 1: process columns from input, store into work array. */ |
---|
1277 | |
---|
1278 | inptr = coef_block; |
---|
1279 | quantptr = (ISLOW_MULT_TYPE *) compptr->dct_table; |
---|
1280 | wsptr = workspace; |
---|
1281 | for (ctr = 0; ctr < 8; ctr++, inptr++, quantptr++, wsptr++) { |
---|
1282 | /* Even part */ |
---|
1283 | |
---|
1284 | z3 = DEQUANTIZE(inptr[DCTSIZE*0], quantptr[DCTSIZE*0]); |
---|
1285 | z3 <<= CONST_BITS; |
---|
1286 | /* Add fudge factor here for final descale. */ |
---|
1287 | z3 += ONE << (CONST_BITS-PASS1_BITS-1); |
---|
1288 | z4 = DEQUANTIZE(inptr[DCTSIZE*4], quantptr[DCTSIZE*4]); |
---|
1289 | z1 = MULTIPLY(z4, FIX(1.144122806)); /* c4 */ |
---|
1290 | z2 = MULTIPLY(z4, FIX(0.437016024)); /* c8 */ |
---|
1291 | tmp10 = z3 + z1; |
---|
1292 | tmp11 = z3 - z2; |
---|
1293 | |
---|
1294 | tmp22 = RIGHT_SHIFT(z3 - ((z1 - z2) << 1), /* c0 = (c4-c8)*2 */ |
---|
1295 | CONST_BITS-PASS1_BITS); |
---|
1296 | |
---|
1297 | z2 = DEQUANTIZE(inptr[DCTSIZE*2], quantptr[DCTSIZE*2]); |
---|
1298 | z3 = DEQUANTIZE(inptr[DCTSIZE*6], quantptr[DCTSIZE*6]); |
---|
1299 | |
---|
1300 | z1 = MULTIPLY(z2 + z3, FIX(0.831253876)); /* c6 */ |
---|
1301 | tmp12 = z1 + MULTIPLY(z2, FIX(0.513743148)); /* c2-c6 */ |
---|
1302 | tmp13 = z1 - MULTIPLY(z3, FIX(2.176250899)); /* c2+c6 */ |
---|
1303 | |
---|
1304 | tmp20 = tmp10 + tmp12; |
---|
1305 | tmp24 = tmp10 - tmp12; |
---|
1306 | tmp21 = tmp11 + tmp13; |
---|
1307 | tmp23 = tmp11 - tmp13; |
---|
1308 | |
---|
1309 | /* Odd part */ |
---|
1310 | |
---|
1311 | z1 = DEQUANTIZE(inptr[DCTSIZE*1], quantptr[DCTSIZE*1]); |
---|
1312 | z2 = DEQUANTIZE(inptr[DCTSIZE*3], quantptr[DCTSIZE*3]); |
---|
1313 | z3 = DEQUANTIZE(inptr[DCTSIZE*5], quantptr[DCTSIZE*5]); |
---|
1314 | z4 = DEQUANTIZE(inptr[DCTSIZE*7], quantptr[DCTSIZE*7]); |
---|
1315 | |
---|
1316 | tmp11 = z2 + z4; |
---|
1317 | tmp13 = z2 - z4; |
---|
1318 | |
---|
1319 | tmp12 = MULTIPLY(tmp13, FIX(0.309016994)); /* (c3-c7)/2 */ |
---|
1320 | z5 = z3 << CONST_BITS; |
---|
1321 | |
---|
1322 | z2 = MULTIPLY(tmp11, FIX(0.951056516)); /* (c3+c7)/2 */ |
---|
1323 | z4 = z5 + tmp12; |
---|
1324 | |
---|
1325 | tmp10 = MULTIPLY(z1, FIX(1.396802247)) + z2 + z4; /* c1 */ |
---|
1326 | tmp14 = MULTIPLY(z1, FIX(0.221231742)) - z2 + z4; /* c9 */ |
---|
1327 | |
---|
1328 | z2 = MULTIPLY(tmp11, FIX(0.587785252)); /* (c1-c9)/2 */ |
---|
1329 | z4 = z5 - tmp12 - (tmp13 << (CONST_BITS - 1)); |
---|
1330 | |
---|
1331 | tmp12 = (z1 - tmp13 - z3) << PASS1_BITS; |
---|
1332 | |
---|
1333 | tmp11 = MULTIPLY(z1, FIX(1.260073511)) - z2 - z4; /* c3 */ |
---|
1334 | tmp13 = MULTIPLY(z1, FIX(0.642039522)) - z2 + z4; /* c7 */ |
---|
1335 | |
---|
1336 | /* Final output stage */ |
---|
1337 | |
---|
1338 | wsptr[8*0] = (int) RIGHT_SHIFT(tmp20 + tmp10, CONST_BITS-PASS1_BITS); |
---|
1339 | wsptr[8*9] = (int) RIGHT_SHIFT(tmp20 - tmp10, CONST_BITS-PASS1_BITS); |
---|
1340 | wsptr[8*1] = (int) RIGHT_SHIFT(tmp21 + tmp11, CONST_BITS-PASS1_BITS); |
---|
1341 | wsptr[8*8] = (int) RIGHT_SHIFT(tmp21 - tmp11, CONST_BITS-PASS1_BITS); |
---|
1342 | wsptr[8*2] = (int) (tmp22 + tmp12); |
---|
1343 | wsptr[8*7] = (int) (tmp22 - tmp12); |
---|
1344 | wsptr[8*3] = (int) RIGHT_SHIFT(tmp23 + tmp13, CONST_BITS-PASS1_BITS); |
---|
1345 | wsptr[8*6] = (int) RIGHT_SHIFT(tmp23 - tmp13, CONST_BITS-PASS1_BITS); |
---|
1346 | wsptr[8*4] = (int) RIGHT_SHIFT(tmp24 + tmp14, CONST_BITS-PASS1_BITS); |
---|
1347 | wsptr[8*5] = (int) RIGHT_SHIFT(tmp24 - tmp14, CONST_BITS-PASS1_BITS); |
---|
1348 | } |
---|
1349 | |
---|
1350 | /* Pass 2: process 10 rows from work array, store into output array. */ |
---|
1351 | |
---|
1352 | wsptr = workspace; |
---|
1353 | for (ctr = 0; ctr < 10; ctr++) { |
---|
1354 | outptr = output_buf[ctr] + output_col; |
---|
1355 | |
---|
1356 | /* Even part */ |
---|
1357 | |
---|
1358 | /* Add fudge factor here for final descale. */ |
---|
1359 | z3 = (INT32) wsptr[0] + (ONE << (PASS1_BITS+2)); |
---|
1360 | z3 <<= CONST_BITS; |
---|
1361 | z4 = (INT32) wsptr[4]; |
---|
1362 | z1 = MULTIPLY(z4, FIX(1.144122806)); /* c4 */ |
---|
1363 | z2 = MULTIPLY(z4, FIX(0.437016024)); /* c8 */ |
---|
1364 | tmp10 = z3 + z1; |
---|
1365 | tmp11 = z3 - z2; |
---|
1366 | |
---|
1367 | tmp22 = z3 - ((z1 - z2) << 1); /* c0 = (c4-c8)*2 */ |
---|
1368 | |
---|
1369 | z2 = (INT32) wsptr[2]; |
---|
1370 | z3 = (INT32) wsptr[6]; |
---|
1371 | |
---|
1372 | z1 = MULTIPLY(z2 + z3, FIX(0.831253876)); /* c6 */ |
---|
1373 | tmp12 = z1 + MULTIPLY(z2, FIX(0.513743148)); /* c2-c6 */ |
---|
1374 | tmp13 = z1 - MULTIPLY(z3, FIX(2.176250899)); /* c2+c6 */ |
---|
1375 | |
---|
1376 | tmp20 = tmp10 + tmp12; |
---|
1377 | tmp24 = tmp10 - tmp12; |
---|
1378 | tmp21 = tmp11 + tmp13; |
---|
1379 | tmp23 = tmp11 - tmp13; |
---|
1380 | |
---|
1381 | /* Odd part */ |
---|
1382 | |
---|
1383 | z1 = (INT32) wsptr[1]; |
---|
1384 | z2 = (INT32) wsptr[3]; |
---|
1385 | z3 = (INT32) wsptr[5]; |
---|
1386 | z3 <<= CONST_BITS; |
---|
1387 | z4 = (INT32) wsptr[7]; |
---|
1388 | |
---|
1389 | tmp11 = z2 + z4; |
---|
1390 | tmp13 = z2 - z4; |
---|
1391 | |
---|
1392 | tmp12 = MULTIPLY(tmp13, FIX(0.309016994)); /* (c3-c7)/2 */ |
---|
1393 | |
---|
1394 | z2 = MULTIPLY(tmp11, FIX(0.951056516)); /* (c3+c7)/2 */ |
---|
1395 | z4 = z3 + tmp12; |
---|
1396 | |
---|
1397 | tmp10 = MULTIPLY(z1, FIX(1.396802247)) + z2 + z4; /* c1 */ |
---|
1398 | tmp14 = MULTIPLY(z1, FIX(0.221231742)) - z2 + z4; /* c9 */ |
---|
1399 | |
---|
1400 | z2 = MULTIPLY(tmp11, FIX(0.587785252)); /* (c1-c9)/2 */ |
---|
1401 | z4 = z3 - tmp12 - (tmp13 << (CONST_BITS - 1)); |
---|
1402 | |
---|
1403 | tmp12 = ((z1 - tmp13) << CONST_BITS) - z3; |
---|
1404 | |
---|
1405 | tmp11 = MULTIPLY(z1, FIX(1.260073511)) - z2 - z4; /* c3 */ |
---|
1406 | tmp13 = MULTIPLY(z1, FIX(0.642039522)) - z2 + z4; /* c7 */ |
---|
1407 | |
---|
1408 | /* Final output stage */ |
---|
1409 | |
---|
1410 | outptr[0] = range_limit[(int) RIGHT_SHIFT(tmp20 + tmp10, |
---|
1411 | CONST_BITS+PASS1_BITS+3) |
---|
1412 | & RANGE_MASK]; |
---|
1413 | outptr[9] = range_limit[(int) RIGHT_SHIFT(tmp20 - tmp10, |
---|
1414 | CONST_BITS+PASS1_BITS+3) |
---|
1415 | & RANGE_MASK]; |
---|
1416 | outptr[1] = range_limit[(int) RIGHT_SHIFT(tmp21 + tmp11, |
---|
1417 | CONST_BITS+PASS1_BITS+3) |
---|
1418 | & RANGE_MASK]; |
---|
1419 | outptr[8] = range_limit[(int) RIGHT_SHIFT(tmp21 - tmp11, |
---|
1420 | CONST_BITS+PASS1_BITS+3) |
---|
1421 | & RANGE_MASK]; |
---|
1422 | outptr[2] = range_limit[(int) RIGHT_SHIFT(tmp22 + tmp12, |
---|
1423 | CONST_BITS+PASS1_BITS+3) |
---|
1424 | & RANGE_MASK]; |
---|
1425 | outptr[7] = range_limit[(int) RIGHT_SHIFT(tmp22 - tmp12, |
---|
1426 | CONST_BITS+PASS1_BITS+3) |
---|
1427 | & RANGE_MASK]; |
---|
1428 | outptr[3] = range_limit[(int) RIGHT_SHIFT(tmp23 + tmp13, |
---|
1429 | CONST_BITS+PASS1_BITS+3) |
---|
1430 | & RANGE_MASK]; |
---|
1431 | outptr[6] = range_limit[(int) RIGHT_SHIFT(tmp23 - tmp13, |
---|
1432 | CONST_BITS+PASS1_BITS+3) |
---|
1433 | & RANGE_MASK]; |
---|
1434 | outptr[4] = range_limit[(int) RIGHT_SHIFT(tmp24 + tmp14, |
---|
1435 | CONST_BITS+PASS1_BITS+3) |
---|
1436 | & RANGE_MASK]; |
---|
1437 | outptr[5] = range_limit[(int) RIGHT_SHIFT(tmp24 - tmp14, |
---|
1438 | CONST_BITS+PASS1_BITS+3) |
---|
1439 | & RANGE_MASK]; |
---|
1440 | |
---|
1441 | wsptr += 8; /* advance pointer to next row */ |
---|
1442 | } |
---|
1443 | } |
---|
1444 | |
---|
1445 | |
---|
1446 | /* |
---|
1447 | * Perform dequantization and inverse DCT on one block of coefficients, |
---|
1448 | * producing a 11x11 output block. |
---|
1449 | * |
---|
1450 | * Optimized algorithm with 24 multiplications in the 1-D kernel. |
---|
1451 | * cK represents sqrt(2) * cos(K*pi/22). |
---|
1452 | */ |
---|
1453 | |
---|
1454 | GLOBAL(void) |
---|
1455 | jpeg_idct_11x11 (j_decompress_ptr cinfo, jpeg_component_info * compptr, |
---|
1456 | JCOEFPTR coef_block, |
---|
1457 | JSAMPARRAY output_buf, JDIMENSION output_col) |
---|
1458 | { |
---|
1459 | INT32 tmp10, tmp11, tmp12, tmp13, tmp14; |
---|
1460 | INT32 tmp20, tmp21, tmp22, tmp23, tmp24, tmp25; |
---|
1461 | INT32 z1, z2, z3, z4; |
---|
1462 | JCOEFPTR inptr; |
---|
1463 | ISLOW_MULT_TYPE * quantptr; |
---|
1464 | int * wsptr; |
---|
1465 | JSAMPROW outptr; |
---|
1466 | JSAMPLE *range_limit = IDCT_range_limit(cinfo); |
---|
1467 | int ctr; |
---|
1468 | int workspace[8*11]; /* buffers data between passes */ |
---|
1469 | SHIFT_TEMPS |
---|
1470 | |
---|
1471 | /* Pass 1: process columns from input, store into work array. */ |
---|
1472 | |
---|
1473 | inptr = coef_block; |
---|
1474 | quantptr = (ISLOW_MULT_TYPE *) compptr->dct_table; |
---|
1475 | wsptr = workspace; |
---|
1476 | for (ctr = 0; ctr < 8; ctr++, inptr++, quantptr++, wsptr++) { |
---|
1477 | /* Even part */ |
---|
1478 | |
---|
1479 | tmp10 = DEQUANTIZE(inptr[DCTSIZE*0], quantptr[DCTSIZE*0]); |
---|
1480 | tmp10 <<= CONST_BITS; |
---|
1481 | /* Add fudge factor here for final descale. */ |
---|
1482 | tmp10 += ONE << (CONST_BITS-PASS1_BITS-1); |
---|
1483 | |
---|
1484 | z1 = DEQUANTIZE(inptr[DCTSIZE*2], quantptr[DCTSIZE*2]); |
---|
1485 | z2 = DEQUANTIZE(inptr[DCTSIZE*4], quantptr[DCTSIZE*4]); |
---|
1486 | z3 = DEQUANTIZE(inptr[DCTSIZE*6], quantptr[DCTSIZE*6]); |
---|
1487 | |
---|
1488 | tmp20 = MULTIPLY(z2 - z3, FIX(2.546640132)); /* c2+c4 */ |
---|
1489 | tmp23 = MULTIPLY(z2 - z1, FIX(0.430815045)); /* c2-c6 */ |
---|
1490 | z4 = z1 + z3; |
---|
1491 | tmp24 = MULTIPLY(z4, - FIX(1.155664402)); /* -(c2-c10) */ |
---|
1492 | z4 -= z2; |
---|
1493 | tmp25 = tmp10 + MULTIPLY(z4, FIX(1.356927976)); /* c2 */ |
---|
1494 | tmp21 = tmp20 + tmp23 + tmp25 - |
---|
1495 | MULTIPLY(z2, FIX(1.821790775)); /* c2+c4+c10-c6 */ |
---|
1496 | tmp20 += tmp25 + MULTIPLY(z3, FIX(2.115825087)); /* c4+c6 */ |
---|
1497 | tmp23 += tmp25 - MULTIPLY(z1, FIX(1.513598477)); /* c6+c8 */ |
---|
1498 | tmp24 += tmp25; |
---|
1499 | tmp22 = tmp24 - MULTIPLY(z3, FIX(0.788749120)); /* c8+c10 */ |
---|
1500 | tmp24 += MULTIPLY(z2, FIX(1.944413522)) - /* c2+c8 */ |
---|
1501 | MULTIPLY(z1, FIX(1.390975730)); /* c4+c10 */ |
---|
1502 | tmp25 = tmp10 - MULTIPLY(z4, FIX(1.414213562)); /* c0 */ |
---|
1503 | |
---|
1504 | /* Odd part */ |
---|
1505 | |
---|
1506 | z1 = DEQUANTIZE(inptr[DCTSIZE*1], quantptr[DCTSIZE*1]); |
---|
1507 | z2 = DEQUANTIZE(inptr[DCTSIZE*3], quantptr[DCTSIZE*3]); |
---|
1508 | z3 = DEQUANTIZE(inptr[DCTSIZE*5], quantptr[DCTSIZE*5]); |
---|
1509 | z4 = DEQUANTIZE(inptr[DCTSIZE*7], quantptr[DCTSIZE*7]); |
---|
1510 | |
---|
1511 | tmp11 = z1 + z2; |
---|
1512 | tmp14 = MULTIPLY(tmp11 + z3 + z4, FIX(0.398430003)); /* c9 */ |
---|
1513 | tmp11 = MULTIPLY(tmp11, FIX(0.887983902)); /* c3-c9 */ |
---|
1514 | tmp12 = MULTIPLY(z1 + z3, FIX(0.670361295)); /* c5-c9 */ |
---|
1515 | tmp13 = tmp14 + MULTIPLY(z1 + z4, FIX(0.366151574)); /* c7-c9 */ |
---|
1516 | tmp10 = tmp11 + tmp12 + tmp13 - |
---|
1517 | MULTIPLY(z1, FIX(0.923107866)); /* c7+c5+c3-c1-2*c9 */ |
---|
1518 | z1 = tmp14 - MULTIPLY(z2 + z3, FIX(1.163011579)); /* c7+c9 */ |
---|
1519 | tmp11 += z1 + MULTIPLY(z2, FIX(2.073276588)); /* c1+c7+3*c9-c3 */ |
---|
1520 | tmp12 += z1 - MULTIPLY(z3, FIX(1.192193623)); /* c3+c5-c7-c9 */ |
---|
1521 | z1 = MULTIPLY(z2 + z4, - FIX(1.798248910)); /* -(c1+c9) */ |
---|
1522 | tmp11 += z1; |
---|
1523 | tmp13 += z1 + MULTIPLY(z4, FIX(2.102458632)); /* c1+c5+c9-c7 */ |
---|
1524 | tmp14 += MULTIPLY(z2, - FIX(1.467221301)) + /* -(c5+c9) */ |
---|
1525 | MULTIPLY(z3, FIX(1.001388905)) - /* c1-c9 */ |
---|
1526 | MULTIPLY(z4, FIX(1.684843907)); /* c3+c9 */ |
---|
1527 | |
---|
1528 | /* Final output stage */ |
---|
1529 | |
---|
1530 | wsptr[8*0] = (int) RIGHT_SHIFT(tmp20 + tmp10, CONST_BITS-PASS1_BITS); |
---|
1531 | wsptr[8*10] = (int) RIGHT_SHIFT(tmp20 - tmp10, CONST_BITS-PASS1_BITS); |
---|
1532 | wsptr[8*1] = (int) RIGHT_SHIFT(tmp21 + tmp11, CONST_BITS-PASS1_BITS); |
---|
1533 | wsptr[8*9] = (int) RIGHT_SHIFT(tmp21 - tmp11, CONST_BITS-PASS1_BITS); |
---|
1534 | wsptr[8*2] = (int) RIGHT_SHIFT(tmp22 + tmp12, CONST_BITS-PASS1_BITS); |
---|
1535 | wsptr[8*8] = (int) RIGHT_SHIFT(tmp22 - tmp12, CONST_BITS-PASS1_BITS); |
---|
1536 | wsptr[8*3] = (int) RIGHT_SHIFT(tmp23 + tmp13, CONST_BITS-PASS1_BITS); |
---|
1537 | wsptr[8*7] = (int) RIGHT_SHIFT(tmp23 - tmp13, CONST_BITS-PASS1_BITS); |
---|
1538 | wsptr[8*4] = (int) RIGHT_SHIFT(tmp24 + tmp14, CONST_BITS-PASS1_BITS); |
---|
1539 | wsptr[8*6] = (int) RIGHT_SHIFT(tmp24 - tmp14, CONST_BITS-PASS1_BITS); |
---|
1540 | wsptr[8*5] = (int) RIGHT_SHIFT(tmp25, CONST_BITS-PASS1_BITS); |
---|
1541 | } |
---|
1542 | |
---|
1543 | /* Pass 2: process 11 rows from work array, store into output array. */ |
---|
1544 | |
---|
1545 | wsptr = workspace; |
---|
1546 | for (ctr = 0; ctr < 11; ctr++) { |
---|
1547 | outptr = output_buf[ctr] + output_col; |
---|
1548 | |
---|
1549 | /* Even part */ |
---|
1550 | |
---|
1551 | /* Add fudge factor here for final descale. */ |
---|
1552 | tmp10 = (INT32) wsptr[0] + (ONE << (PASS1_BITS+2)); |
---|
1553 | tmp10 <<= CONST_BITS; |
---|
1554 | |
---|
1555 | z1 = (INT32) wsptr[2]; |
---|
1556 | z2 = (INT32) wsptr[4]; |
---|
1557 | z3 = (INT32) wsptr[6]; |
---|
1558 | |
---|
1559 | tmp20 = MULTIPLY(z2 - z3, FIX(2.546640132)); /* c2+c4 */ |
---|
1560 | tmp23 = MULTIPLY(z2 - z1, FIX(0.430815045)); /* c2-c6 */ |
---|
1561 | z4 = z1 + z3; |
---|
1562 | tmp24 = MULTIPLY(z4, - FIX(1.155664402)); /* -(c2-c10) */ |
---|
1563 | z4 -= z2; |
---|
1564 | tmp25 = tmp10 + MULTIPLY(z4, FIX(1.356927976)); /* c2 */ |
---|
1565 | tmp21 = tmp20 + tmp23 + tmp25 - |
---|
1566 | MULTIPLY(z2, FIX(1.821790775)); /* c2+c4+c10-c6 */ |
---|
1567 | tmp20 += tmp25 + MULTIPLY(z3, FIX(2.115825087)); /* c4+c6 */ |
---|
1568 | tmp23 += tmp25 - MULTIPLY(z1, FIX(1.513598477)); /* c6+c8 */ |
---|
1569 | tmp24 += tmp25; |
---|
1570 | tmp22 = tmp24 - MULTIPLY(z3, FIX(0.788749120)); /* c8+c10 */ |
---|
1571 | tmp24 += MULTIPLY(z2, FIX(1.944413522)) - /* c2+c8 */ |
---|
1572 | MULTIPLY(z1, FIX(1.390975730)); /* c4+c10 */ |
---|
1573 | tmp25 = tmp10 - MULTIPLY(z4, FIX(1.414213562)); /* c0 */ |
---|
1574 | |
---|
1575 | /* Odd part */ |
---|
1576 | |
---|
1577 | z1 = (INT32) wsptr[1]; |
---|
1578 | z2 = (INT32) wsptr[3]; |
---|
1579 | z3 = (INT32) wsptr[5]; |
---|
1580 | z4 = (INT32) wsptr[7]; |
---|
1581 | |
---|
1582 | tmp11 = z1 + z2; |
---|
1583 | tmp14 = MULTIPLY(tmp11 + z3 + z4, FIX(0.398430003)); /* c9 */ |
---|
1584 | tmp11 = MULTIPLY(tmp11, FIX(0.887983902)); /* c3-c9 */ |
---|
1585 | tmp12 = MULTIPLY(z1 + z3, FIX(0.670361295)); /* c5-c9 */ |
---|
1586 | tmp13 = tmp14 + MULTIPLY(z1 + z4, FIX(0.366151574)); /* c7-c9 */ |
---|
1587 | tmp10 = tmp11 + tmp12 + tmp13 - |
---|
1588 | MULTIPLY(z1, FIX(0.923107866)); /* c7+c5+c3-c1-2*c9 */ |
---|
1589 | z1 = tmp14 - MULTIPLY(z2 + z3, FIX(1.163011579)); /* c7+c9 */ |
---|
1590 | tmp11 += z1 + MULTIPLY(z2, FIX(2.073276588)); /* c1+c7+3*c9-c3 */ |
---|
1591 | tmp12 += z1 - MULTIPLY(z3, FIX(1.192193623)); /* c3+c5-c7-c9 */ |
---|
1592 | z1 = MULTIPLY(z2 + z4, - FIX(1.798248910)); /* -(c1+c9) */ |
---|
1593 | tmp11 += z1; |
---|
1594 | tmp13 += z1 + MULTIPLY(z4, FIX(2.102458632)); /* c1+c5+c9-c7 */ |
---|
1595 | tmp14 += MULTIPLY(z2, - FIX(1.467221301)) + /* -(c5+c9) */ |
---|
1596 | MULTIPLY(z3, FIX(1.001388905)) - /* c1-c9 */ |
---|
1597 | MULTIPLY(z4, FIX(1.684843907)); /* c3+c9 */ |
---|
1598 | |
---|
1599 | /* Final output stage */ |
---|
1600 | |
---|
1601 | outptr[0] = range_limit[(int) RIGHT_SHIFT(tmp20 + tmp10, |
---|
1602 | CONST_BITS+PASS1_BITS+3) |
---|
1603 | & RANGE_MASK]; |
---|
1604 | outptr[10] = range_limit[(int) RIGHT_SHIFT(tmp20 - tmp10, |
---|
1605 | CONST_BITS+PASS1_BITS+3) |
---|
1606 | & RANGE_MASK]; |
---|
1607 | outptr[1] = range_limit[(int) RIGHT_SHIFT(tmp21 + tmp11, |
---|
1608 | CONST_BITS+PASS1_BITS+3) |
---|
1609 | & RANGE_MASK]; |
---|
1610 | outptr[9] = range_limit[(int) RIGHT_SHIFT(tmp21 - tmp11, |
---|
1611 | CONST_BITS+PASS1_BITS+3) |
---|
1612 | & RANGE_MASK]; |
---|
1613 | outptr[2] = range_limit[(int) RIGHT_SHIFT(tmp22 + tmp12, |
---|
1614 | CONST_BITS+PASS1_BITS+3) |
---|
1615 | & RANGE_MASK]; |
---|
1616 | outptr[8] = range_limit[(int) RIGHT_SHIFT(tmp22 - tmp12, |
---|
1617 | CONST_BITS+PASS1_BITS+3) |
---|
1618 | & RANGE_MASK]; |
---|
1619 | outptr[3] = range_limit[(int) RIGHT_SHIFT(tmp23 + tmp13, |
---|
1620 | CONST_BITS+PASS1_BITS+3) |
---|
1621 | & RANGE_MASK]; |
---|
1622 | outptr[7] = range_limit[(int) RIGHT_SHIFT(tmp23 - tmp13, |
---|
1623 | CONST_BITS+PASS1_BITS+3) |
---|
1624 | & RANGE_MASK]; |
---|
1625 | outptr[4] = range_limit[(int) RIGHT_SHIFT(tmp24 + tmp14, |
---|
1626 | CONST_BITS+PASS1_BITS+3) |
---|
1627 | & RANGE_MASK]; |
---|
1628 | outptr[6] = range_limit[(int) RIGHT_SHIFT(tmp24 - tmp14, |
---|
1629 | CONST_BITS+PASS1_BITS+3) |
---|
1630 | & RANGE_MASK]; |
---|
1631 | outptr[5] = range_limit[(int) RIGHT_SHIFT(tmp25, |
---|
1632 | CONST_BITS+PASS1_BITS+3) |
---|
1633 | & RANGE_MASK]; |
---|
1634 | |
---|
1635 | wsptr += 8; /* advance pointer to next row */ |
---|
1636 | } |
---|
1637 | } |
---|
1638 | |
---|
1639 | |
---|
1640 | /* |
---|
1641 | * Perform dequantization and inverse DCT on one block of coefficients, |
---|
1642 | * producing a 12x12 output block. |
---|
1643 | * |
---|
1644 | * Optimized algorithm with 15 multiplications in the 1-D kernel. |
---|
1645 | * cK represents sqrt(2) * cos(K*pi/24). |
---|
1646 | */ |
---|
1647 | |
---|
1648 | GLOBAL(void) |
---|
1649 | jpeg_idct_12x12 (j_decompress_ptr cinfo, jpeg_component_info * compptr, |
---|
1650 | JCOEFPTR coef_block, |
---|
1651 | JSAMPARRAY output_buf, JDIMENSION output_col) |
---|
1652 | { |
---|
1653 | INT32 tmp10, tmp11, tmp12, tmp13, tmp14, tmp15; |
---|
1654 | INT32 tmp20, tmp21, tmp22, tmp23, tmp24, tmp25; |
---|
1655 | INT32 z1, z2, z3, z4; |
---|
1656 | JCOEFPTR inptr; |
---|
1657 | ISLOW_MULT_TYPE * quantptr; |
---|
1658 | int * wsptr; |
---|
1659 | JSAMPROW outptr; |
---|
1660 | JSAMPLE *range_limit = IDCT_range_limit(cinfo); |
---|
1661 | int ctr; |
---|
1662 | int workspace[8*12]; /* buffers data between passes */ |
---|
1663 | SHIFT_TEMPS |
---|
1664 | |
---|
1665 | /* Pass 1: process columns from input, store into work array. */ |
---|
1666 | |
---|
1667 | inptr = coef_block; |
---|
1668 | quantptr = (ISLOW_MULT_TYPE *) compptr->dct_table; |
---|
1669 | wsptr = workspace; |
---|
1670 | for (ctr = 0; ctr < 8; ctr++, inptr++, quantptr++, wsptr++) { |
---|
1671 | /* Even part */ |
---|
1672 | |
---|
1673 | z3 = DEQUANTIZE(inptr[DCTSIZE*0], quantptr[DCTSIZE*0]); |
---|
1674 | z3 <<= CONST_BITS; |
---|
1675 | /* Add fudge factor here for final descale. */ |
---|
1676 | z3 += ONE << (CONST_BITS-PASS1_BITS-1); |
---|
1677 | |
---|
1678 | z4 = DEQUANTIZE(inptr[DCTSIZE*4], quantptr[DCTSIZE*4]); |
---|
1679 | z4 = MULTIPLY(z4, FIX(1.224744871)); /* c4 */ |
---|
1680 | |
---|
1681 | tmp10 = z3 + z4; |
---|
1682 | tmp11 = z3 - z4; |
---|
1683 | |
---|
1684 | z1 = DEQUANTIZE(inptr[DCTSIZE*2], quantptr[DCTSIZE*2]); |
---|
1685 | z4 = MULTIPLY(z1, FIX(1.366025404)); /* c2 */ |
---|
1686 | z1 <<= CONST_BITS; |
---|
1687 | z2 = DEQUANTIZE(inptr[DCTSIZE*6], quantptr[DCTSIZE*6]); |
---|
1688 | z2 <<= CONST_BITS; |
---|
1689 | |
---|
1690 | tmp12 = z1 - z2; |
---|
1691 | |
---|
1692 | tmp21 = z3 + tmp12; |
---|
1693 | tmp24 = z3 - tmp12; |
---|
1694 | |
---|
1695 | tmp12 = z4 + z2; |
---|
1696 | |
---|
1697 | tmp20 = tmp10 + tmp12; |
---|
1698 | tmp25 = tmp10 - tmp12; |
---|
1699 | |
---|
1700 | tmp12 = z4 - z1 - z2; |
---|
1701 | |
---|
1702 | tmp22 = tmp11 + tmp12; |
---|
1703 | tmp23 = tmp11 - tmp12; |
---|
1704 | |
---|
1705 | /* Odd part */ |
---|
1706 | |
---|
1707 | z1 = DEQUANTIZE(inptr[DCTSIZE*1], quantptr[DCTSIZE*1]); |
---|
1708 | z2 = DEQUANTIZE(inptr[DCTSIZE*3], quantptr[DCTSIZE*3]); |
---|
1709 | z3 = DEQUANTIZE(inptr[DCTSIZE*5], quantptr[DCTSIZE*5]); |
---|
1710 | z4 = DEQUANTIZE(inptr[DCTSIZE*7], quantptr[DCTSIZE*7]); |
---|
1711 | |
---|
1712 | tmp11 = MULTIPLY(z2, FIX(1.306562965)); /* c3 */ |
---|
1713 | tmp14 = MULTIPLY(z2, - FIX_0_541196100); /* -c9 */ |
---|
1714 | |
---|
1715 | tmp10 = z1 + z3; |
---|
1716 | tmp15 = MULTIPLY(tmp10 + z4, FIX(0.860918669)); /* c7 */ |
---|
1717 | tmp12 = tmp15 + MULTIPLY(tmp10, FIX(0.261052384)); /* c5-c7 */ |
---|
1718 | tmp10 = tmp12 + tmp11 + MULTIPLY(z1, FIX(0.280143716)); /* c1-c5 */ |
---|
1719 | tmp13 = MULTIPLY(z3 + z4, - FIX(1.045510580)); /* -(c7+c11) */ |
---|
1720 | tmp12 += tmp13 + tmp14 - MULTIPLY(z3, FIX(1.478575242)); /* c1+c5-c7-c11 */ |
---|
1721 | tmp13 += tmp15 - tmp11 + MULTIPLY(z4, FIX(1.586706681)); /* c1+c11 */ |
---|
1722 | tmp15 += tmp14 - MULTIPLY(z1, FIX(0.676326758)) - /* c7-c11 */ |
---|
1723 | MULTIPLY(z4, FIX(1.982889723)); /* c5+c7 */ |
---|
1724 | |
---|
1725 | z1 -= z4; |
---|
1726 | z2 -= z3; |
---|
1727 | z3 = MULTIPLY(z1 + z2, FIX_0_541196100); /* c9 */ |
---|
1728 | tmp11 = z3 + MULTIPLY(z1, FIX_0_765366865); /* c3-c9 */ |
---|
1729 | tmp14 = z3 - MULTIPLY(z2, FIX_1_847759065); /* c3+c9 */ |
---|
1730 | |
---|
1731 | /* Final output stage */ |
---|
1732 | |
---|
1733 | wsptr[8*0] = (int) RIGHT_SHIFT(tmp20 + tmp10, CONST_BITS-PASS1_BITS); |
---|
1734 | wsptr[8*11] = (int) RIGHT_SHIFT(tmp20 - tmp10, CONST_BITS-PASS1_BITS); |
---|
1735 | wsptr[8*1] = (int) RIGHT_SHIFT(tmp21 + tmp11, CONST_BITS-PASS1_BITS); |
---|
1736 | wsptr[8*10] = (int) RIGHT_SHIFT(tmp21 - tmp11, CONST_BITS-PASS1_BITS); |
---|
1737 | wsptr[8*2] = (int) RIGHT_SHIFT(tmp22 + tmp12, CONST_BITS-PASS1_BITS); |
---|
1738 | wsptr[8*9] = (int) RIGHT_SHIFT(tmp22 - tmp12, CONST_BITS-PASS1_BITS); |
---|
1739 | wsptr[8*3] = (int) RIGHT_SHIFT(tmp23 + tmp13, CONST_BITS-PASS1_BITS); |
---|
1740 | wsptr[8*8] = (int) RIGHT_SHIFT(tmp23 - tmp13, CONST_BITS-PASS1_BITS); |
---|
1741 | wsptr[8*4] = (int) RIGHT_SHIFT(tmp24 + tmp14, CONST_BITS-PASS1_BITS); |
---|
1742 | wsptr[8*7] = (int) RIGHT_SHIFT(tmp24 - tmp14, CONST_BITS-PASS1_BITS); |
---|
1743 | wsptr[8*5] = (int) RIGHT_SHIFT(tmp25 + tmp15, CONST_BITS-PASS1_BITS); |
---|
1744 | wsptr[8*6] = (int) RIGHT_SHIFT(tmp25 - tmp15, CONST_BITS-PASS1_BITS); |
---|
1745 | } |
---|
1746 | |
---|
1747 | /* Pass 2: process 12 rows from work array, store into output array. */ |
---|
1748 | |
---|
1749 | wsptr = workspace; |
---|
1750 | for (ctr = 0; ctr < 12; ctr++) { |
---|
1751 | outptr = output_buf[ctr] + output_col; |
---|
1752 | |
---|
1753 | /* Even part */ |
---|
1754 | |
---|
1755 | /* Add fudge factor here for final descale. */ |
---|
1756 | z3 = (INT32) wsptr[0] + (ONE << (PASS1_BITS+2)); |
---|
1757 | z3 <<= CONST_BITS; |
---|
1758 | |
---|
1759 | z4 = (INT32) wsptr[4]; |
---|
1760 | z4 = MULTIPLY(z4, FIX(1.224744871)); /* c4 */ |
---|
1761 | |
---|
1762 | tmp10 = z3 + z4; |
---|
1763 | tmp11 = z3 - z4; |
---|
1764 | |
---|
1765 | z1 = (INT32) wsptr[2]; |
---|
1766 | z4 = MULTIPLY(z1, FIX(1.366025404)); /* c2 */ |
---|
1767 | z1 <<= CONST_BITS; |
---|
1768 | z2 = (INT32) wsptr[6]; |
---|
1769 | z2 <<= CONST_BITS; |
---|
1770 | |
---|
1771 | tmp12 = z1 - z2; |
---|
1772 | |
---|
1773 | tmp21 = z3 + tmp12; |
---|
1774 | tmp24 = z3 - tmp12; |
---|
1775 | |
---|
1776 | tmp12 = z4 + z2; |
---|
1777 | |
---|
1778 | tmp20 = tmp10 + tmp12; |
---|
1779 | tmp25 = tmp10 - tmp12; |
---|
1780 | |
---|
1781 | tmp12 = z4 - z1 - z2; |
---|
1782 | |
---|
1783 | tmp22 = tmp11 + tmp12; |
---|
1784 | tmp23 = tmp11 - tmp12; |
---|
1785 | |
---|
1786 | /* Odd part */ |
---|
1787 | |
---|
1788 | z1 = (INT32) wsptr[1]; |
---|
1789 | z2 = (INT32) wsptr[3]; |
---|
1790 | z3 = (INT32) wsptr[5]; |
---|
1791 | z4 = (INT32) wsptr[7]; |
---|
1792 | |
---|
1793 | tmp11 = MULTIPLY(z2, FIX(1.306562965)); /* c3 */ |
---|
1794 | tmp14 = MULTIPLY(z2, - FIX_0_541196100); /* -c9 */ |
---|
1795 | |
---|
1796 | tmp10 = z1 + z3; |
---|
1797 | tmp15 = MULTIPLY(tmp10 + z4, FIX(0.860918669)); /* c7 */ |
---|
1798 | tmp12 = tmp15 + MULTIPLY(tmp10, FIX(0.261052384)); /* c5-c7 */ |
---|
1799 | tmp10 = tmp12 + tmp11 + MULTIPLY(z1, FIX(0.280143716)); /* c1-c5 */ |
---|
1800 | tmp13 = MULTIPLY(z3 + z4, - FIX(1.045510580)); /* -(c7+c11) */ |
---|
1801 | tmp12 += tmp13 + tmp14 - MULTIPLY(z3, FIX(1.478575242)); /* c1+c5-c7-c11 */ |
---|
1802 | tmp13 += tmp15 - tmp11 + MULTIPLY(z4, FIX(1.586706681)); /* c1+c11 */ |
---|
1803 | tmp15 += tmp14 - MULTIPLY(z1, FIX(0.676326758)) - /* c7-c11 */ |
---|
1804 | MULTIPLY(z4, FIX(1.982889723)); /* c5+c7 */ |
---|
1805 | |
---|
1806 | z1 -= z4; |
---|
1807 | z2 -= z3; |
---|
1808 | z3 = MULTIPLY(z1 + z2, FIX_0_541196100); /* c9 */ |
---|
1809 | tmp11 = z3 + MULTIPLY(z1, FIX_0_765366865); /* c3-c9 */ |
---|
1810 | tmp14 = z3 - MULTIPLY(z2, FIX_1_847759065); /* c3+c9 */ |
---|
1811 | |
---|
1812 | /* Final output stage */ |
---|
1813 | |
---|
1814 | outptr[0] = range_limit[(int) RIGHT_SHIFT(tmp20 + tmp10, |
---|
1815 | CONST_BITS+PASS1_BITS+3) |
---|
1816 | & RANGE_MASK]; |
---|
1817 | outptr[11] = range_limit[(int) RIGHT_SHIFT(tmp20 - tmp10, |
---|
1818 | CONST_BITS+PASS1_BITS+3) |
---|
1819 | & RANGE_MASK]; |
---|
1820 | outptr[1] = range_limit[(int) RIGHT_SHIFT(tmp21 + tmp11, |
---|
1821 | CONST_BITS+PASS1_BITS+3) |
---|
1822 | & RANGE_MASK]; |
---|
1823 | outptr[10] = range_limit[(int) RIGHT_SHIFT(tmp21 - tmp11, |
---|
1824 | CONST_BITS+PASS1_BITS+3) |
---|
1825 | & RANGE_MASK]; |
---|
1826 | outptr[2] = range_limit[(int) RIGHT_SHIFT(tmp22 + tmp12, |
---|
1827 | CONST_BITS+PASS1_BITS+3) |
---|
1828 | & RANGE_MASK]; |
---|
1829 | outptr[9] = range_limit[(int) RIGHT_SHIFT(tmp22 - tmp12, |
---|
1830 | CONST_BITS+PASS1_BITS+3) |
---|
1831 | & RANGE_MASK]; |
---|
1832 | outptr[3] = range_limit[(int) RIGHT_SHIFT(tmp23 + tmp13, |
---|
1833 | CONST_BITS+PASS1_BITS+3) |
---|
1834 | & RANGE_MASK]; |
---|
1835 | outptr[8] = range_limit[(int) RIGHT_SHIFT(tmp23 - tmp13, |
---|
1836 | CONST_BITS+PASS1_BITS+3) |
---|
1837 | & RANGE_MASK]; |
---|
1838 | outptr[4] = range_limit[(int) RIGHT_SHIFT(tmp24 + tmp14, |
---|
1839 | CONST_BITS+PASS1_BITS+3) |
---|
1840 | & RANGE_MASK]; |
---|
1841 | outptr[7] = range_limit[(int) RIGHT_SHIFT(tmp24 - tmp14, |
---|
1842 | CONST_BITS+PASS1_BITS+3) |
---|
1843 | & RANGE_MASK]; |
---|
1844 | outptr[5] = range_limit[(int) RIGHT_SHIFT(tmp25 + tmp15, |
---|
1845 | CONST_BITS+PASS1_BITS+3) |
---|
1846 | & RANGE_MASK]; |
---|
1847 | outptr[6] = range_limit[(int) RIGHT_SHIFT(tmp25 - tmp15, |
---|
1848 | CONST_BITS+PASS1_BITS+3) |
---|
1849 | & RANGE_MASK]; |
---|
1850 | |
---|
1851 | wsptr += 8; /* advance pointer to next row */ |
---|
1852 | } |
---|
1853 | } |
---|
1854 | |
---|
1855 | |
---|
1856 | /* |
---|
1857 | * Perform dequantization and inverse DCT on one block of coefficients, |
---|
1858 | * producing a 13x13 output block. |
---|
1859 | * |
---|
1860 | * Optimized algorithm with 29 multiplications in the 1-D kernel. |
---|
1861 | * cK represents sqrt(2) * cos(K*pi/26). |
---|
1862 | */ |
---|
1863 | |
---|
1864 | GLOBAL(void) |
---|
1865 | jpeg_idct_13x13 (j_decompress_ptr cinfo, jpeg_component_info * compptr, |
---|
1866 | JCOEFPTR coef_block, |
---|
1867 | JSAMPARRAY output_buf, JDIMENSION output_col) |
---|
1868 | { |
---|
1869 | INT32 tmp10, tmp11, tmp12, tmp13, tmp14, tmp15; |
---|
1870 | INT32 tmp20, tmp21, tmp22, tmp23, tmp24, tmp25, tmp26; |
---|
1871 | INT32 z1, z2, z3, z4; |
---|
1872 | JCOEFPTR inptr; |
---|
1873 | ISLOW_MULT_TYPE * quantptr; |
---|
1874 | int * wsptr; |
---|
1875 | JSAMPROW outptr; |
---|
1876 | JSAMPLE *range_limit = IDCT_range_limit(cinfo); |
---|
1877 | int ctr; |
---|
1878 | int workspace[8*13]; /* buffers data between passes */ |
---|
1879 | SHIFT_TEMPS |
---|
1880 | |
---|
1881 | /* Pass 1: process columns from input, store into work array. */ |
---|
1882 | |
---|
1883 | inptr = coef_block; |
---|
1884 | quantptr = (ISLOW_MULT_TYPE *) compptr->dct_table; |
---|
1885 | wsptr = workspace; |
---|
1886 | for (ctr = 0; ctr < 8; ctr++, inptr++, quantptr++, wsptr++) { |
---|
1887 | /* Even part */ |
---|
1888 | |
---|
1889 | z1 = DEQUANTIZE(inptr[DCTSIZE*0], quantptr[DCTSIZE*0]); |
---|
1890 | z1 <<= CONST_BITS; |
---|
1891 | /* Add fudge factor here for final descale. */ |
---|
1892 | z1 += ONE << (CONST_BITS-PASS1_BITS-1); |
---|
1893 | |
---|
1894 | z2 = DEQUANTIZE(inptr[DCTSIZE*2], quantptr[DCTSIZE*2]); |
---|
1895 | z3 = DEQUANTIZE(inptr[DCTSIZE*4], quantptr[DCTSIZE*4]); |
---|
1896 | z4 = DEQUANTIZE(inptr[DCTSIZE*6], quantptr[DCTSIZE*6]); |
---|
1897 | |
---|
1898 | tmp10 = z3 + z4; |
---|
1899 | tmp11 = z3 - z4; |
---|
1900 | |
---|
1901 | tmp12 = MULTIPLY(tmp10, FIX(1.155388986)); /* (c4+c6)/2 */ |
---|
1902 | tmp13 = MULTIPLY(tmp11, FIX(0.096834934)) + z1; /* (c4-c6)/2 */ |
---|
1903 | |
---|
1904 | tmp20 = MULTIPLY(z2, FIX(1.373119086)) + tmp12 + tmp13; /* c2 */ |
---|
1905 | tmp22 = MULTIPLY(z2, FIX(0.501487041)) - tmp12 + tmp13; /* c10 */ |
---|
1906 | |
---|
1907 | tmp12 = MULTIPLY(tmp10, FIX(0.316450131)); /* (c8-c12)/2 */ |
---|
1908 | tmp13 = MULTIPLY(tmp11, FIX(0.486914739)) + z1; /* (c8+c12)/2 */ |
---|
1909 | |
---|
1910 | tmp21 = MULTIPLY(z2, FIX(1.058554052)) - tmp12 + tmp13; /* c6 */ |
---|
1911 | tmp25 = MULTIPLY(z2, - FIX(1.252223920)) + tmp12 + tmp13; /* c4 */ |
---|
1912 | |
---|
1913 | tmp12 = MULTIPLY(tmp10, FIX(0.435816023)); /* (c2-c10)/2 */ |
---|
1914 | tmp13 = MULTIPLY(tmp11, FIX(0.937303064)) - z1; /* (c2+c10)/2 */ |
---|
1915 | |
---|
1916 | tmp23 = MULTIPLY(z2, - FIX(0.170464608)) - tmp12 - tmp13; /* c12 */ |
---|
1917 | tmp24 = MULTIPLY(z2, - FIX(0.803364869)) + tmp12 - tmp13; /* c8 */ |
---|
1918 | |
---|
1919 | tmp26 = MULTIPLY(tmp11 - z2, FIX(1.414213562)) + z1; /* c0 */ |
---|
1920 | |
---|
1921 | /* Odd part */ |
---|
1922 | |
---|
1923 | z1 = DEQUANTIZE(inptr[DCTSIZE*1], quantptr[DCTSIZE*1]); |
---|
1924 | z2 = DEQUANTIZE(inptr[DCTSIZE*3], quantptr[DCTSIZE*3]); |
---|
1925 | z3 = DEQUANTIZE(inptr[DCTSIZE*5], quantptr[DCTSIZE*5]); |
---|
1926 | z4 = DEQUANTIZE(inptr[DCTSIZE*7], quantptr[DCTSIZE*7]); |
---|
1927 | |
---|
1928 | tmp11 = MULTIPLY(z1 + z2, FIX(1.322312651)); /* c3 */ |
---|
1929 | tmp12 = MULTIPLY(z1 + z3, FIX(1.163874945)); /* c5 */ |
---|
1930 | tmp15 = z1 + z4; |
---|
1931 | tmp13 = MULTIPLY(tmp15, FIX(0.937797057)); /* c7 */ |
---|
1932 | tmp10 = tmp11 + tmp12 + tmp13 - |
---|
1933 | MULTIPLY(z1, FIX(2.020082300)); /* c7+c5+c3-c1 */ |
---|
1934 | tmp14 = MULTIPLY(z2 + z3, - FIX(0.338443458)); /* -c11 */ |
---|
1935 | tmp11 += tmp14 + MULTIPLY(z2, FIX(0.837223564)); /* c5+c9+c11-c3 */ |
---|
1936 | tmp12 += tmp14 - MULTIPLY(z3, FIX(1.572116027)); /* c1+c5-c9-c11 */ |
---|
1937 | tmp14 = MULTIPLY(z2 + z4, - FIX(1.163874945)); /* -c5 */ |
---|
1938 | tmp11 += tmp14; |
---|
1939 | tmp13 += tmp14 + MULTIPLY(z4, FIX(2.205608352)); /* c3+c5+c9-c7 */ |
---|
1940 | tmp14 = MULTIPLY(z3 + z4, - FIX(0.657217813)); /* -c9 */ |
---|
1941 | tmp12 += tmp14; |
---|
1942 | tmp13 += tmp14; |
---|
1943 | tmp15 = MULTIPLY(tmp15, FIX(0.338443458)); /* c11 */ |
---|
1944 | tmp14 = tmp15 + MULTIPLY(z1, FIX(0.318774355)) - /* c9-c11 */ |
---|
1945 | MULTIPLY(z2, FIX(0.466105296)); /* c1-c7 */ |
---|
1946 | z1 = MULTIPLY(z3 - z2, FIX(0.937797057)); /* c7 */ |
---|
1947 | tmp14 += z1; |
---|
1948 | tmp15 += z1 + MULTIPLY(z3, FIX(0.384515595)) - /* c3-c7 */ |
---|
1949 | MULTIPLY(z4, FIX(1.742345811)); /* c1+c11 */ |
---|
1950 | |
---|
1951 | /* Final output stage */ |
---|
1952 | |
---|
1953 | wsptr[8*0] = (int) RIGHT_SHIFT(tmp20 + tmp10, CONST_BITS-PASS1_BITS); |
---|
1954 | wsptr[8*12] = (int) RIGHT_SHIFT(tmp20 - tmp10, CONST_BITS-PASS1_BITS); |
---|
1955 | wsptr[8*1] = (int) RIGHT_SHIFT(tmp21 + tmp11, CONST_BITS-PASS1_BITS); |
---|
1956 | wsptr[8*11] = (int) RIGHT_SHIFT(tmp21 - tmp11, CONST_BITS-PASS1_BITS); |
---|
1957 | wsptr[8*2] = (int) RIGHT_SHIFT(tmp22 + tmp12, CONST_BITS-PASS1_BITS); |
---|
1958 | wsptr[8*10] = (int) RIGHT_SHIFT(tmp22 - tmp12, CONST_BITS-PASS1_BITS); |
---|
1959 | wsptr[8*3] = (int) RIGHT_SHIFT(tmp23 + tmp13, CONST_BITS-PASS1_BITS); |
---|
1960 | wsptr[8*9] = (int) RIGHT_SHIFT(tmp23 - tmp13, CONST_BITS-PASS1_BITS); |
---|
1961 | wsptr[8*4] = (int) RIGHT_SHIFT(tmp24 + tmp14, CONST_BITS-PASS1_BITS); |
---|
1962 | wsptr[8*8] = (int) RIGHT_SHIFT(tmp24 - tmp14, CONST_BITS-PASS1_BITS); |
---|
1963 | wsptr[8*5] = (int) RIGHT_SHIFT(tmp25 + tmp15, CONST_BITS-PASS1_BITS); |
---|
1964 | wsptr[8*7] = (int) RIGHT_SHIFT(tmp25 - tmp15, CONST_BITS-PASS1_BITS); |
---|
1965 | wsptr[8*6] = (int) RIGHT_SHIFT(tmp26, CONST_BITS-PASS1_BITS); |
---|
1966 | } |
---|
1967 | |
---|
1968 | /* Pass 2: process 13 rows from work array, store into output array. */ |
---|
1969 | |
---|
1970 | wsptr = workspace; |
---|
1971 | for (ctr = 0; ctr < 13; ctr++) { |
---|
1972 | outptr = output_buf[ctr] + output_col; |
---|
1973 | |
---|
1974 | /* Even part */ |
---|
1975 | |
---|
1976 | /* Add fudge factor here for final descale. */ |
---|
1977 | z1 = (INT32) wsptr[0] + (ONE << (PASS1_BITS+2)); |
---|
1978 | z1 <<= CONST_BITS; |
---|
1979 | |
---|
1980 | z2 = (INT32) wsptr[2]; |
---|
1981 | z3 = (INT32) wsptr[4]; |
---|
1982 | z4 = (INT32) wsptr[6]; |
---|
1983 | |
---|
1984 | tmp10 = z3 + z4; |
---|
1985 | tmp11 = z3 - z4; |
---|
1986 | |
---|
1987 | tmp12 = MULTIPLY(tmp10, FIX(1.155388986)); /* (c4+c6)/2 */ |
---|
1988 | tmp13 = MULTIPLY(tmp11, FIX(0.096834934)) + z1; /* (c4-c6)/2 */ |
---|
1989 | |
---|
1990 | tmp20 = MULTIPLY(z2, FIX(1.373119086)) + tmp12 + tmp13; /* c2 */ |
---|
1991 | tmp22 = MULTIPLY(z2, FIX(0.501487041)) - tmp12 + tmp13; /* c10 */ |
---|
1992 | |
---|
1993 | tmp12 = MULTIPLY(tmp10, FIX(0.316450131)); /* (c8-c12)/2 */ |
---|
1994 | tmp13 = MULTIPLY(tmp11, FIX(0.486914739)) + z1; /* (c8+c12)/2 */ |
---|
1995 | |
---|
1996 | tmp21 = MULTIPLY(z2, FIX(1.058554052)) - tmp12 + tmp13; /* c6 */ |
---|
1997 | tmp25 = MULTIPLY(z2, - FIX(1.252223920)) + tmp12 + tmp13; /* c4 */ |
---|
1998 | |
---|
1999 | tmp12 = MULTIPLY(tmp10, FIX(0.435816023)); /* (c2-c10)/2 */ |
---|
2000 | tmp13 = MULTIPLY(tmp11, FIX(0.937303064)) - z1; /* (c2+c10)/2 */ |
---|
2001 | |
---|
2002 | tmp23 = MULTIPLY(z2, - FIX(0.170464608)) - tmp12 - tmp13; /* c12 */ |
---|
2003 | tmp24 = MULTIPLY(z2, - FIX(0.803364869)) + tmp12 - tmp13; /* c8 */ |
---|
2004 | |
---|
2005 | tmp26 = MULTIPLY(tmp11 - z2, FIX(1.414213562)) + z1; /* c0 */ |
---|
2006 | |
---|
2007 | /* Odd part */ |
---|
2008 | |
---|
2009 | z1 = (INT32) wsptr[1]; |
---|
2010 | z2 = (INT32) wsptr[3]; |
---|
2011 | z3 = (INT32) wsptr[5]; |
---|
2012 | z4 = (INT32) wsptr[7]; |
---|
2013 | |
---|
2014 | tmp11 = MULTIPLY(z1 + z2, FIX(1.322312651)); /* c3 */ |
---|
2015 | tmp12 = MULTIPLY(z1 + z3, FIX(1.163874945)); /* c5 */ |
---|
2016 | tmp15 = z1 + z4; |
---|
2017 | tmp13 = MULTIPLY(tmp15, FIX(0.937797057)); /* c7 */ |
---|
2018 | tmp10 = tmp11 + tmp12 + tmp13 - |
---|
2019 | MULTIPLY(z1, FIX(2.020082300)); /* c7+c5+c3-c1 */ |
---|
2020 | tmp14 = MULTIPLY(z2 + z3, - FIX(0.338443458)); /* -c11 */ |
---|
2021 | tmp11 += tmp14 + MULTIPLY(z2, FIX(0.837223564)); /* c5+c9+c11-c3 */ |
---|
2022 | tmp12 += tmp14 - MULTIPLY(z3, FIX(1.572116027)); /* c1+c5-c9-c11 */ |
---|
2023 | tmp14 = MULTIPLY(z2 + z4, - FIX(1.163874945)); /* -c5 */ |
---|
2024 | tmp11 += tmp14; |
---|
2025 | tmp13 += tmp14 + MULTIPLY(z4, FIX(2.205608352)); /* c3+c5+c9-c7 */ |
---|
2026 | tmp14 = MULTIPLY(z3 + z4, - FIX(0.657217813)); /* -c9 */ |
---|
2027 | tmp12 += tmp14; |
---|
2028 | tmp13 += tmp14; |
---|
2029 | tmp15 = MULTIPLY(tmp15, FIX(0.338443458)); /* c11 */ |
---|
2030 | tmp14 = tmp15 + MULTIPLY(z1, FIX(0.318774355)) - /* c9-c11 */ |
---|
2031 | MULTIPLY(z2, FIX(0.466105296)); /* c1-c7 */ |
---|
2032 | z1 = MULTIPLY(z3 - z2, FIX(0.937797057)); /* c7 */ |
---|
2033 | tmp14 += z1; |
---|
2034 | tmp15 += z1 + MULTIPLY(z3, FIX(0.384515595)) - /* c3-c7 */ |
---|
2035 | MULTIPLY(z4, FIX(1.742345811)); /* c1+c11 */ |
---|
2036 | |
---|
2037 | /* Final output stage */ |
---|
2038 | |
---|
2039 | outptr[0] = range_limit[(int) RIGHT_SHIFT(tmp20 + tmp10, |
---|
2040 | CONST_BITS+PASS1_BITS+3) |
---|
2041 | & RANGE_MASK]; |
---|
2042 | outptr[12] = range_limit[(int) RIGHT_SHIFT(tmp20 - tmp10, |
---|
2043 | CONST_BITS+PASS1_BITS+3) |
---|
2044 | & RANGE_MASK]; |
---|
2045 | outptr[1] = range_limit[(int) RIGHT_SHIFT(tmp21 + tmp11, |
---|
2046 | CONST_BITS+PASS1_BITS+3) |
---|
2047 | & RANGE_MASK]; |
---|
2048 | outptr[11] = range_limit[(int) RIGHT_SHIFT(tmp21 - tmp11, |
---|
2049 | CONST_BITS+PASS1_BITS+3) |
---|
2050 | & RANGE_MASK]; |
---|
2051 | outptr[2] = range_limit[(int) RIGHT_SHIFT(tmp22 + tmp12, |
---|
2052 | CONST_BITS+PASS1_BITS+3) |
---|
2053 | & RANGE_MASK]; |
---|
2054 | outptr[10] = range_limit[(int) RIGHT_SHIFT(tmp22 - tmp12, |
---|
2055 | CONST_BITS+PASS1_BITS+3) |
---|
2056 | & RANGE_MASK]; |
---|
2057 | outptr[3] = range_limit[(int) RIGHT_SHIFT(tmp23 + tmp13, |
---|
2058 | CONST_BITS+PASS1_BITS+3) |
---|
2059 | & RANGE_MASK]; |
---|
2060 | outptr[9] = range_limit[(int) RIGHT_SHIFT(tmp23 - tmp13, |
---|
2061 | CONST_BITS+PASS1_BITS+3) |
---|
2062 | & RANGE_MASK]; |
---|
2063 | outptr[4] = range_limit[(int) RIGHT_SHIFT(tmp24 + tmp14, |
---|
2064 | CONST_BITS+PASS1_BITS+3) |
---|
2065 | & RANGE_MASK]; |
---|
2066 | outptr[8] = range_limit[(int) RIGHT_SHIFT(tmp24 - tmp14, |
---|
2067 | CONST_BITS+PASS1_BITS+3) |
---|
2068 | & RANGE_MASK]; |
---|
2069 | outptr[5] = range_limit[(int) RIGHT_SHIFT(tmp25 + tmp15, |
---|
2070 | CONST_BITS+PASS1_BITS+3) |
---|
2071 | & RANGE_MASK]; |
---|
2072 | outptr[7] = range_limit[(int) RIGHT_SHIFT(tmp25 - tmp15, |
---|
2073 | CONST_BITS+PASS1_BITS+3) |
---|
2074 | & RANGE_MASK]; |
---|
2075 | outptr[6] = range_limit[(int) RIGHT_SHIFT(tmp26, |
---|
2076 | CONST_BITS+PASS1_BITS+3) |
---|
2077 | & RANGE_MASK]; |
---|
2078 | |
---|
2079 | wsptr += 8; /* advance pointer to next row */ |
---|
2080 | } |
---|
2081 | } |
---|
2082 | |
---|
2083 | |
---|
2084 | /* |
---|
2085 | * Perform dequantization and inverse DCT on one block of coefficients, |
---|
2086 | * producing a 14x14 output block. |
---|
2087 | * |
---|
2088 | * Optimized algorithm with 20 multiplications in the 1-D kernel. |
---|
2089 | * cK represents sqrt(2) * cos(K*pi/28). |
---|
2090 | */ |
---|
2091 | |
---|
2092 | GLOBAL(void) |
---|
2093 | jpeg_idct_14x14 (j_decompress_ptr cinfo, jpeg_component_info * compptr, |
---|
2094 | JCOEFPTR coef_block, |
---|
2095 | JSAMPARRAY output_buf, JDIMENSION output_col) |
---|
2096 | { |
---|
2097 | INT32 tmp10, tmp11, tmp12, tmp13, tmp14, tmp15, tmp16; |
---|
2098 | INT32 tmp20, tmp21, tmp22, tmp23, tmp24, tmp25, tmp26; |
---|
2099 | INT32 z1, z2, z3, z4; |
---|
2100 | JCOEFPTR inptr; |
---|
2101 | ISLOW_MULT_TYPE * quantptr; |
---|
2102 | int * wsptr; |
---|
2103 | JSAMPROW outptr; |
---|
2104 | JSAMPLE *range_limit = IDCT_range_limit(cinfo); |
---|
2105 | int ctr; |
---|
2106 | int workspace[8*14]; /* buffers data between passes */ |
---|
2107 | SHIFT_TEMPS |
---|
2108 | |
---|
2109 | /* Pass 1: process columns from input, store into work array. */ |
---|
2110 | |
---|
2111 | inptr = coef_block; |
---|
2112 | quantptr = (ISLOW_MULT_TYPE *) compptr->dct_table; |
---|
2113 | wsptr = workspace; |
---|
2114 | for (ctr = 0; ctr < 8; ctr++, inptr++, quantptr++, wsptr++) { |
---|
2115 | /* Even part */ |
---|
2116 | |
---|
2117 | z1 = DEQUANTIZE(inptr[DCTSIZE*0], quantptr[DCTSIZE*0]); |
---|
2118 | z1 <<= CONST_BITS; |
---|
2119 | /* Add fudge factor here for final descale. */ |
---|
2120 | z1 += ONE << (CONST_BITS-PASS1_BITS-1); |
---|
2121 | z4 = DEQUANTIZE(inptr[DCTSIZE*4], quantptr[DCTSIZE*4]); |
---|
2122 | z2 = MULTIPLY(z4, FIX(1.274162392)); /* c4 */ |
---|
2123 | z3 = MULTIPLY(z4, FIX(0.314692123)); /* c12 */ |
---|
2124 | z4 = MULTIPLY(z4, FIX(0.881747734)); /* c8 */ |
---|
2125 | |
---|
2126 | tmp10 = z1 + z2; |
---|
2127 | tmp11 = z1 + z3; |
---|
2128 | tmp12 = z1 - z4; |
---|
2129 | |
---|
2130 | tmp23 = RIGHT_SHIFT(z1 - ((z2 + z3 - z4) << 1), /* c0 = (c4+c12-c8)*2 */ |
---|
2131 | CONST_BITS-PASS1_BITS); |
---|
2132 | |
---|
2133 | z1 = DEQUANTIZE(inptr[DCTSIZE*2], quantptr[DCTSIZE*2]); |
---|
2134 | z2 = DEQUANTIZE(inptr[DCTSIZE*6], quantptr[DCTSIZE*6]); |
---|
2135 | |
---|
2136 | z3 = MULTIPLY(z1 + z2, FIX(1.105676686)); /* c6 */ |
---|
2137 | |
---|
2138 | tmp13 = z3 + MULTIPLY(z1, FIX(0.273079590)); /* c2-c6 */ |
---|
2139 | tmp14 = z3 - MULTIPLY(z2, FIX(1.719280954)); /* c6+c10 */ |
---|
2140 | tmp15 = MULTIPLY(z1, FIX(0.613604268)) - /* c10 */ |
---|
2141 | MULTIPLY(z2, FIX(1.378756276)); /* c2 */ |
---|
2142 | |
---|
2143 | tmp20 = tmp10 + tmp13; |
---|
2144 | tmp26 = tmp10 - tmp13; |
---|
2145 | tmp21 = tmp11 + tmp14; |
---|
2146 | tmp25 = tmp11 - tmp14; |
---|
2147 | tmp22 = tmp12 + tmp15; |
---|
2148 | tmp24 = tmp12 - tmp15; |
---|
2149 | |
---|
2150 | /* Odd part */ |
---|
2151 | |
---|
2152 | z1 = DEQUANTIZE(inptr[DCTSIZE*1], quantptr[DCTSIZE*1]); |
---|
2153 | z2 = DEQUANTIZE(inptr[DCTSIZE*3], quantptr[DCTSIZE*3]); |
---|
2154 | z3 = DEQUANTIZE(inptr[DCTSIZE*5], quantptr[DCTSIZE*5]); |
---|
2155 | z4 = DEQUANTIZE(inptr[DCTSIZE*7], quantptr[DCTSIZE*7]); |
---|
2156 | tmp13 = z4 << CONST_BITS; |
---|
2157 | |
---|
2158 | tmp14 = z1 + z3; |
---|
2159 | tmp11 = MULTIPLY(z1 + z2, FIX(1.334852607)); /* c3 */ |
---|
2160 | tmp12 = MULTIPLY(tmp14, FIX(1.197448846)); /* c5 */ |
---|
2161 | tmp10 = tmp11 + tmp12 + tmp13 - MULTIPLY(z1, FIX(1.126980169)); /* c3+c5-c1 */ |
---|
2162 | tmp14 = MULTIPLY(tmp14, FIX(0.752406978)); /* c9 */ |
---|
2163 | tmp16 = tmp14 - MULTIPLY(z1, FIX(1.061150426)); /* c9+c11-c13 */ |
---|
2164 | z1 -= z2; |
---|
2165 | tmp15 = MULTIPLY(z1, FIX(0.467085129)) - tmp13; /* c11 */ |
---|
2166 | tmp16 += tmp15; |
---|
2167 | z1 += z4; |
---|
2168 | z4 = MULTIPLY(z2 + z3, - FIX(0.158341681)) - tmp13; /* -c13 */ |
---|
2169 | tmp11 += z4 - MULTIPLY(z2, FIX(0.424103948)); /* c3-c9-c13 */ |
---|
2170 | tmp12 += z4 - MULTIPLY(z3, FIX(2.373959773)); /* c3+c5-c13 */ |
---|
2171 | z4 = MULTIPLY(z3 - z2, FIX(1.405321284)); /* c1 */ |
---|
2172 | tmp14 += z4 + tmp13 - MULTIPLY(z3, FIX(1.6906431334)); /* c1+c9-c11 */ |
---|
2173 | tmp15 += z4 + MULTIPLY(z2, FIX(0.674957567)); /* c1+c11-c5 */ |
---|
2174 | |
---|
2175 | tmp13 = (z1 - z3) << PASS1_BITS; |
---|
2176 | |
---|
2177 | /* Final output stage */ |
---|
2178 | |
---|
2179 | wsptr[8*0] = (int) RIGHT_SHIFT(tmp20 + tmp10, CONST_BITS-PASS1_BITS); |
---|
2180 | wsptr[8*13] = (int) RIGHT_SHIFT(tmp20 - tmp10, CONST_BITS-PASS1_BITS); |
---|
2181 | wsptr[8*1] = (int) RIGHT_SHIFT(tmp21 + tmp11, CONST_BITS-PASS1_BITS); |
---|
2182 | wsptr[8*12] = (int) RIGHT_SHIFT(tmp21 - tmp11, CONST_BITS-PASS1_BITS); |
---|
2183 | wsptr[8*2] = (int) RIGHT_SHIFT(tmp22 + tmp12, CONST_BITS-PASS1_BITS); |
---|
2184 | wsptr[8*11] = (int) RIGHT_SHIFT(tmp22 - tmp12, CONST_BITS-PASS1_BITS); |
---|
2185 | wsptr[8*3] = (int) (tmp23 + tmp13); |
---|
2186 | wsptr[8*10] = (int) (tmp23 - tmp13); |
---|
2187 | wsptr[8*4] = (int) RIGHT_SHIFT(tmp24 + tmp14, CONST_BITS-PASS1_BITS); |
---|
2188 | wsptr[8*9] = (int) RIGHT_SHIFT(tmp24 - tmp14, CONST_BITS-PASS1_BITS); |
---|
2189 | wsptr[8*5] = (int) RIGHT_SHIFT(tmp25 + tmp15, CONST_BITS-PASS1_BITS); |
---|
2190 | wsptr[8*8] = (int) RIGHT_SHIFT(tmp25 - tmp15, CONST_BITS-PASS1_BITS); |
---|
2191 | wsptr[8*6] = (int) RIGHT_SHIFT(tmp26 + tmp16, CONST_BITS-PASS1_BITS); |
---|
2192 | wsptr[8*7] = (int) RIGHT_SHIFT(tmp26 - tmp16, CONST_BITS-PASS1_BITS); |
---|
2193 | } |
---|
2194 | |
---|
2195 | /* Pass 2: process 14 rows from work array, store into output array. */ |
---|
2196 | |
---|
2197 | wsptr = workspace; |
---|
2198 | for (ctr = 0; ctr < 14; ctr++) { |
---|
2199 | outptr = output_buf[ctr] + output_col; |
---|
2200 | |
---|
2201 | /* Even part */ |
---|
2202 | |
---|
2203 | /* Add fudge factor here for final descale. */ |
---|
2204 | z1 = (INT32) wsptr[0] + (ONE << (PASS1_BITS+2)); |
---|
2205 | z1 <<= CONST_BITS; |
---|
2206 | z4 = (INT32) wsptr[4]; |
---|
2207 | z2 = MULTIPLY(z4, FIX(1.274162392)); /* c4 */ |
---|
2208 | z3 = MULTIPLY(z4, FIX(0.314692123)); /* c12 */ |
---|
2209 | z4 = MULTIPLY(z4, FIX(0.881747734)); /* c8 */ |
---|
2210 | |
---|
2211 | tmp10 = z1 + z2; |
---|
2212 | tmp11 = z1 + z3; |
---|
2213 | tmp12 = z1 - z4; |
---|
2214 | |
---|
2215 | tmp23 = z1 - ((z2 + z3 - z4) << 1); /* c0 = (c4+c12-c8)*2 */ |
---|
2216 | |
---|
2217 | z1 = (INT32) wsptr[2]; |
---|
2218 | z2 = (INT32) wsptr[6]; |
---|
2219 | |
---|
2220 | z3 = MULTIPLY(z1 + z2, FIX(1.105676686)); /* c6 */ |
---|
2221 | |
---|
2222 | tmp13 = z3 + MULTIPLY(z1, FIX(0.273079590)); /* c2-c6 */ |
---|
2223 | tmp14 = z3 - MULTIPLY(z2, FIX(1.719280954)); /* c6+c10 */ |
---|
2224 | tmp15 = MULTIPLY(z1, FIX(0.613604268)) - /* c10 */ |
---|
2225 | MULTIPLY(z2, FIX(1.378756276)); /* c2 */ |
---|
2226 | |
---|
2227 | tmp20 = tmp10 + tmp13; |
---|
2228 | tmp26 = tmp10 - tmp13; |
---|
2229 | tmp21 = tmp11 + tmp14; |
---|
2230 | tmp25 = tmp11 - tmp14; |
---|
2231 | tmp22 = tmp12 + tmp15; |
---|
2232 | tmp24 = tmp12 - tmp15; |
---|
2233 | |
---|
2234 | /* Odd part */ |
---|
2235 | |
---|
2236 | z1 = (INT32) wsptr[1]; |
---|
2237 | z2 = (INT32) wsptr[3]; |
---|
2238 | z3 = (INT32) wsptr[5]; |
---|
2239 | z4 = (INT32) wsptr[7]; |
---|
2240 | z4 <<= CONST_BITS; |
---|
2241 | |
---|
2242 | tmp14 = z1 + z3; |
---|
2243 | tmp11 = MULTIPLY(z1 + z2, FIX(1.334852607)); /* c3 */ |
---|
2244 | tmp12 = MULTIPLY(tmp14, FIX(1.197448846)); /* c5 */ |
---|
2245 | tmp10 = tmp11 + tmp12 + z4 - MULTIPLY(z1, FIX(1.126980169)); /* c3+c5-c1 */ |
---|
2246 | tmp14 = MULTIPLY(tmp14, FIX(0.752406978)); /* c9 */ |
---|
2247 | tmp16 = tmp14 - MULTIPLY(z1, FIX(1.061150426)); /* c9+c11-c13 */ |
---|
2248 | z1 -= z2; |
---|
2249 | tmp15 = MULTIPLY(z1, FIX(0.467085129)) - z4; /* c11 */ |
---|
2250 | tmp16 += tmp15; |
---|
2251 | tmp13 = MULTIPLY(z2 + z3, - FIX(0.158341681)) - z4; /* -c13 */ |
---|
2252 | tmp11 += tmp13 - MULTIPLY(z2, FIX(0.424103948)); /* c3-c9-c13 */ |
---|
2253 | tmp12 += tmp13 - MULTIPLY(z3, FIX(2.373959773)); /* c3+c5-c13 */ |
---|
2254 | tmp13 = MULTIPLY(z3 - z2, FIX(1.405321284)); /* c1 */ |
---|
2255 | tmp14 += tmp13 + z4 - MULTIPLY(z3, FIX(1.6906431334)); /* c1+c9-c11 */ |
---|
2256 | tmp15 += tmp13 + MULTIPLY(z2, FIX(0.674957567)); /* c1+c11-c5 */ |
---|
2257 | |
---|
2258 | tmp13 = ((z1 - z3) << CONST_BITS) + z4; |
---|
2259 | |
---|
2260 | /* Final output stage */ |
---|
2261 | |
---|
2262 | outptr[0] = range_limit[(int) RIGHT_SHIFT(tmp20 + tmp10, |
---|
2263 | CONST_BITS+PASS1_BITS+3) |
---|
2264 | & RANGE_MASK]; |
---|
2265 | outptr[13] = range_limit[(int) RIGHT_SHIFT(tmp20 - tmp10, |
---|
2266 | CONST_BITS+PASS1_BITS+3) |
---|
2267 | & RANGE_MASK]; |
---|
2268 | outptr[1] = range_limit[(int) RIGHT_SHIFT(tmp21 + tmp11, |
---|
2269 | CONST_BITS+PASS1_BITS+3) |
---|
2270 | & RANGE_MASK]; |
---|
2271 | outptr[12] = range_limit[(int) RIGHT_SHIFT(tmp21 - tmp11, |
---|
2272 | CONST_BITS+PASS1_BITS+3) |
---|
2273 | & RANGE_MASK]; |
---|
2274 | outptr[2] = range_limit[(int) RIGHT_SHIFT(tmp22 + tmp12, |
---|
2275 | CONST_BITS+PASS1_BITS+3) |
---|
2276 | & RANGE_MASK]; |
---|
2277 | outptr[11] = range_limit[(int) RIGHT_SHIFT(tmp22 - tmp12, |
---|
2278 | CONST_BITS+PASS1_BITS+3) |
---|
2279 | & RANGE_MASK]; |
---|
2280 | outptr[3] = range_limit[(int) RIGHT_SHIFT(tmp23 + tmp13, |
---|
2281 | CONST_BITS+PASS1_BITS+3) |
---|
2282 | & RANGE_MASK]; |
---|
2283 | outptr[10] = range_limit[(int) RIGHT_SHIFT(tmp23 - tmp13, |
---|
2284 | CONST_BITS+PASS1_BITS+3) |
---|
2285 | & RANGE_MASK]; |
---|
2286 | outptr[4] = range_limit[(int) RIGHT_SHIFT(tmp24 + tmp14, |
---|
2287 | CONST_BITS+PASS1_BITS+3) |
---|
2288 | & RANGE_MASK]; |
---|
2289 | outptr[9] = range_limit[(int) RIGHT_SHIFT(tmp24 - tmp14, |
---|
2290 | CONST_BITS+PASS1_BITS+3) |
---|
2291 | & RANGE_MASK]; |
---|
2292 | outptr[5] = range_limit[(int) RIGHT_SHIFT(tmp25 + tmp15, |
---|
2293 | CONST_BITS+PASS1_BITS+3) |
---|
2294 | & RANGE_MASK]; |
---|
2295 | outptr[8] = range_limit[(int) RIGHT_SHIFT(tmp25 - tmp15, |
---|
2296 | CONST_BITS+PASS1_BITS+3) |
---|
2297 | & RANGE_MASK]; |
---|
2298 | outptr[6] = range_limit[(int) RIGHT_SHIFT(tmp26 + tmp16, |
---|
2299 | CONST_BITS+PASS1_BITS+3) |
---|
2300 | & RANGE_MASK]; |
---|
2301 | outptr[7] = range_limit[(int) RIGHT_SHIFT(tmp26 - tmp16, |
---|
2302 | CONST_BITS+PASS1_BITS+3) |
---|
2303 | & RANGE_MASK]; |
---|
2304 | |
---|
2305 | wsptr += 8; /* advance pointer to next row */ |
---|
2306 | } |
---|
2307 | } |
---|
2308 | |
---|
2309 | |
---|
2310 | /* |
---|
2311 | * Perform dequantization and inverse DCT on one block of coefficients, |
---|
2312 | * producing a 15x15 output block. |
---|
2313 | * |
---|
2314 | * Optimized algorithm with 22 multiplications in the 1-D kernel. |
---|
2315 | * cK represents sqrt(2) * cos(K*pi/30). |
---|
2316 | */ |
---|
2317 | |
---|
2318 | GLOBAL(void) |
---|
2319 | jpeg_idct_15x15 (j_decompress_ptr cinfo, jpeg_component_info * compptr, |
---|
2320 | JCOEFPTR coef_block, |
---|
2321 | JSAMPARRAY output_buf, JDIMENSION output_col) |
---|
2322 | { |
---|
2323 | INT32 tmp10, tmp11, tmp12, tmp13, tmp14, tmp15, tmp16; |
---|
2324 | INT32 tmp20, tmp21, tmp22, tmp23, tmp24, tmp25, tmp26, tmp27; |
---|
2325 | INT32 z1, z2, z3, z4; |
---|
2326 | JCOEFPTR inptr; |
---|
2327 | ISLOW_MULT_TYPE * quantptr; |
---|
2328 | int * wsptr; |
---|
2329 | JSAMPROW outptr; |
---|
2330 | JSAMPLE *range_limit = IDCT_range_limit(cinfo); |
---|
2331 | int ctr; |
---|
2332 | int workspace[8*15]; /* buffers data between passes */ |
---|
2333 | SHIFT_TEMPS |
---|
2334 | |
---|
2335 | /* Pass 1: process columns from input, store into work array. */ |
---|
2336 | |
---|
2337 | inptr = coef_block; |
---|
2338 | quantptr = (ISLOW_MULT_TYPE *) compptr->dct_table; |
---|
2339 | wsptr = workspace; |
---|
2340 | for (ctr = 0; ctr < 8; ctr++, inptr++, quantptr++, wsptr++) { |
---|
2341 | /* Even part */ |
---|
2342 | |
---|
2343 | z1 = DEQUANTIZE(inptr[DCTSIZE*0], quantptr[DCTSIZE*0]); |
---|
2344 | z1 <<= CONST_BITS; |
---|
2345 | /* Add fudge factor here for final descale. */ |
---|
2346 | z1 += ONE << (CONST_BITS-PASS1_BITS-1); |
---|
2347 | |
---|
2348 | z2 = DEQUANTIZE(inptr[DCTSIZE*2], quantptr[DCTSIZE*2]); |
---|
2349 | z3 = DEQUANTIZE(inptr[DCTSIZE*4], quantptr[DCTSIZE*4]); |
---|
2350 | z4 = DEQUANTIZE(inptr[DCTSIZE*6], quantptr[DCTSIZE*6]); |
---|
2351 | |
---|
2352 | tmp10 = MULTIPLY(z4, FIX(0.437016024)); /* c12 */ |
---|
2353 | tmp11 = MULTIPLY(z4, FIX(1.144122806)); /* c6 */ |
---|
2354 | |
---|
2355 | tmp12 = z1 - tmp10; |
---|
2356 | tmp13 = z1 + tmp11; |
---|
2357 | z1 -= (tmp11 - tmp10) << 1; /* c0 = (c6-c12)*2 */ |
---|
2358 | |
---|
2359 | z4 = z2 - z3; |
---|
2360 | z3 += z2; |
---|
2361 | tmp10 = MULTIPLY(z3, FIX(1.337628990)); /* (c2+c4)/2 */ |
---|
2362 | tmp11 = MULTIPLY(z4, FIX(0.045680613)); /* (c2-c4)/2 */ |
---|
2363 | z2 = MULTIPLY(z2, FIX(1.439773946)); /* c4+c14 */ |
---|
2364 | |
---|
2365 | tmp20 = tmp13 + tmp10 + tmp11; |
---|
2366 | tmp23 = tmp12 - tmp10 + tmp11 + z2; |
---|
2367 | |
---|
2368 | tmp10 = MULTIPLY(z3, FIX(0.547059574)); /* (c8+c14)/2 */ |
---|
2369 | tmp11 = MULTIPLY(z4, FIX(0.399234004)); /* (c8-c14)/2 */ |
---|
2370 | |
---|
2371 | tmp25 = tmp13 - tmp10 - tmp11; |
---|
2372 | tmp26 = tmp12 + tmp10 - tmp11 - z2; |
---|
2373 | |
---|
2374 | tmp10 = MULTIPLY(z3, FIX(0.790569415)); /* (c6+c12)/2 */ |
---|
2375 | tmp11 = MULTIPLY(z4, FIX(0.353553391)); /* (c6-c12)/2 */ |
---|
2376 | |
---|
2377 | tmp21 = tmp12 + tmp10 + tmp11; |
---|
2378 | tmp24 = tmp13 - tmp10 + tmp11; |
---|
2379 | tmp11 += tmp11; |
---|
2380 | tmp22 = z1 + tmp11; /* c10 = c6-c12 */ |
---|
2381 | tmp27 = z1 - tmp11 - tmp11; /* c0 = (c6-c12)*2 */ |
---|
2382 | |
---|
2383 | /* Odd part */ |
---|
2384 | |
---|
2385 | z1 = DEQUANTIZE(inptr[DCTSIZE*1], quantptr[DCTSIZE*1]); |
---|
2386 | z2 = DEQUANTIZE(inptr[DCTSIZE*3], quantptr[DCTSIZE*3]); |
---|
2387 | z4 = DEQUANTIZE(inptr[DCTSIZE*5], quantptr[DCTSIZE*5]); |
---|
2388 | z3 = MULTIPLY(z4, FIX(1.224744871)); /* c5 */ |
---|
2389 | z4 = DEQUANTIZE(inptr[DCTSIZE*7], quantptr[DCTSIZE*7]); |
---|
2390 | |
---|
2391 | tmp13 = z2 - z4; |
---|
2392 | tmp15 = MULTIPLY(z1 + tmp13, FIX(0.831253876)); /* c9 */ |
---|
2393 | tmp11 = tmp15 + MULTIPLY(z1, FIX(0.513743148)); /* c3-c9 */ |
---|
2394 | tmp14 = tmp15 - MULTIPLY(tmp13, FIX(2.176250899)); /* c3+c9 */ |
---|
2395 | |
---|
2396 | tmp13 = MULTIPLY(z2, - FIX(0.831253876)); /* -c9 */ |
---|
2397 | tmp15 = MULTIPLY(z2, - FIX(1.344997024)); /* -c3 */ |
---|
2398 | z2 = z1 - z4; |
---|
2399 | tmp12 = z3 + MULTIPLY(z2, FIX(1.406466353)); /* c1 */ |
---|
2400 | |
---|
2401 | tmp10 = tmp12 + MULTIPLY(z4, FIX(2.457431844)) - tmp15; /* c1+c7 */ |
---|
2402 | tmp16 = tmp12 - MULTIPLY(z1, FIX(1.112434820)) + tmp13; /* c1-c13 */ |
---|
2403 | tmp12 = MULTIPLY(z2, FIX(1.224744871)) - z3; /* c5 */ |
---|
2404 | z2 = MULTIPLY(z1 + z4, FIX(0.575212477)); /* c11 */ |
---|
2405 | tmp13 += z2 + MULTIPLY(z1, FIX(0.475753014)) - z3; /* c7-c11 */ |
---|
2406 | tmp15 += z2 - MULTIPLY(z4, FIX(0.869244010)) + z3; /* c11+c13 */ |
---|
2407 | |
---|
2408 | /* Final output stage */ |
---|
2409 | |
---|
2410 | wsptr[8*0] = (int) RIGHT_SHIFT(tmp20 + tmp10, CONST_BITS-PASS1_BITS); |
---|
2411 | wsptr[8*14] = (int) RIGHT_SHIFT(tmp20 - tmp10, CONST_BITS-PASS1_BITS); |
---|
2412 | wsptr[8*1] = (int) RIGHT_SHIFT(tmp21 + tmp11, CONST_BITS-PASS1_BITS); |
---|
2413 | wsptr[8*13] = (int) RIGHT_SHIFT(tmp21 - tmp11, CONST_BITS-PASS1_BITS); |
---|
2414 | wsptr[8*2] = (int) RIGHT_SHIFT(tmp22 + tmp12, CONST_BITS-PASS1_BITS); |
---|
2415 | wsptr[8*12] = (int) RIGHT_SHIFT(tmp22 - tmp12, CONST_BITS-PASS1_BITS); |
---|
2416 | wsptr[8*3] = (int) RIGHT_SHIFT(tmp23 + tmp13, CONST_BITS-PASS1_BITS); |
---|
2417 | wsptr[8*11] = (int) RIGHT_SHIFT(tmp23 - tmp13, CONST_BITS-PASS1_BITS); |
---|
2418 | wsptr[8*4] = (int) RIGHT_SHIFT(tmp24 + tmp14, CONST_BITS-PASS1_BITS); |
---|
2419 | wsptr[8*10] = (int) RIGHT_SHIFT(tmp24 - tmp14, CONST_BITS-PASS1_BITS); |
---|
2420 | wsptr[8*5] = (int) RIGHT_SHIFT(tmp25 + tmp15, CONST_BITS-PASS1_BITS); |
---|
2421 | wsptr[8*9] = (int) RIGHT_SHIFT(tmp25 - tmp15, CONST_BITS-PASS1_BITS); |
---|
2422 | wsptr[8*6] = (int) RIGHT_SHIFT(tmp26 + tmp16, CONST_BITS-PASS1_BITS); |
---|
2423 | wsptr[8*8] = (int) RIGHT_SHIFT(tmp26 - tmp16, CONST_BITS-PASS1_BITS); |
---|
2424 | wsptr[8*7] = (int) RIGHT_SHIFT(tmp27, CONST_BITS-PASS1_BITS); |
---|
2425 | } |
---|
2426 | |
---|
2427 | /* Pass 2: process 15 rows from work array, store into output array. */ |
---|
2428 | |
---|
2429 | wsptr = workspace; |
---|
2430 | for (ctr = 0; ctr < 15; ctr++) { |
---|
2431 | outptr = output_buf[ctr] + output_col; |
---|
2432 | |
---|
2433 | /* Even part */ |
---|
2434 | |
---|
2435 | /* Add fudge factor here for final descale. */ |
---|
2436 | z1 = (INT32) wsptr[0] + (ONE << (PASS1_BITS+2)); |
---|
2437 | z1 <<= CONST_BITS; |
---|
2438 | |
---|
2439 | z2 = (INT32) wsptr[2]; |
---|
2440 | z3 = (INT32) wsptr[4]; |
---|
2441 | z4 = (INT32) wsptr[6]; |
---|
2442 | |
---|
2443 | tmp10 = MULTIPLY(z4, FIX(0.437016024)); /* c12 */ |
---|
2444 | tmp11 = MULTIPLY(z4, FIX(1.144122806)); /* c6 */ |
---|
2445 | |
---|
2446 | tmp12 = z1 - tmp10; |
---|
2447 | tmp13 = z1 + tmp11; |
---|
2448 | z1 -= (tmp11 - tmp10) << 1; /* c0 = (c6-c12)*2 */ |
---|
2449 | |
---|
2450 | z4 = z2 - z3; |
---|
2451 | z3 += z2; |
---|
2452 | tmp10 = MULTIPLY(z3, FIX(1.337628990)); /* (c2+c4)/2 */ |
---|
2453 | tmp11 = MULTIPLY(z4, FIX(0.045680613)); /* (c2-c4)/2 */ |
---|
2454 | z2 = MULTIPLY(z2, FIX(1.439773946)); /* c4+c14 */ |
---|
2455 | |
---|
2456 | tmp20 = tmp13 + tmp10 + tmp11; |
---|
2457 | tmp23 = tmp12 - tmp10 + tmp11 + z2; |
---|
2458 | |
---|
2459 | tmp10 = MULTIPLY(z3, FIX(0.547059574)); /* (c8+c14)/2 */ |
---|
2460 | tmp11 = MULTIPLY(z4, FIX(0.399234004)); /* (c8-c14)/2 */ |
---|
2461 | |
---|
2462 | tmp25 = tmp13 - tmp10 - tmp11; |
---|
2463 | tmp26 = tmp12 + tmp10 - tmp11 - z2; |
---|
2464 | |
---|
2465 | tmp10 = MULTIPLY(z3, FIX(0.790569415)); /* (c6+c12)/2 */ |
---|
2466 | tmp11 = MULTIPLY(z4, FIX(0.353553391)); /* (c6-c12)/2 */ |
---|
2467 | |
---|
2468 | tmp21 = tmp12 + tmp10 + tmp11; |
---|
2469 | tmp24 = tmp13 - tmp10 + tmp11; |
---|
2470 | tmp11 += tmp11; |
---|
2471 | tmp22 = z1 + tmp11; /* c10 = c6-c12 */ |
---|
2472 | tmp27 = z1 - tmp11 - tmp11; /* c0 = (c6-c12)*2 */ |
---|
2473 | |
---|
2474 | /* Odd part */ |
---|
2475 | |
---|
2476 | z1 = (INT32) wsptr[1]; |
---|
2477 | z2 = (INT32) wsptr[3]; |
---|
2478 | z4 = (INT32) wsptr[5]; |
---|
2479 | z3 = MULTIPLY(z4, FIX(1.224744871)); /* c5 */ |
---|
2480 | z4 = (INT32) wsptr[7]; |
---|
2481 | |
---|
2482 | tmp13 = z2 - z4; |
---|
2483 | tmp15 = MULTIPLY(z1 + tmp13, FIX(0.831253876)); /* c9 */ |
---|
2484 | tmp11 = tmp15 + MULTIPLY(z1, FIX(0.513743148)); /* c3-c9 */ |
---|
2485 | tmp14 = tmp15 - MULTIPLY(tmp13, FIX(2.176250899)); /* c3+c9 */ |
---|
2486 | |
---|
2487 | tmp13 = MULTIPLY(z2, - FIX(0.831253876)); /* -c9 */ |
---|
2488 | tmp15 = MULTIPLY(z2, - FIX(1.344997024)); /* -c3 */ |
---|
2489 | z2 = z1 - z4; |
---|
2490 | tmp12 = z3 + MULTIPLY(z2, FIX(1.406466353)); /* c1 */ |
---|
2491 | |
---|
2492 | tmp10 = tmp12 + MULTIPLY(z4, FIX(2.457431844)) - tmp15; /* c1+c7 */ |
---|
2493 | tmp16 = tmp12 - MULTIPLY(z1, FIX(1.112434820)) + tmp13; /* c1-c13 */ |
---|
2494 | tmp12 = MULTIPLY(z2, FIX(1.224744871)) - z3; /* c5 */ |
---|
2495 | z2 = MULTIPLY(z1 + z4, FIX(0.575212477)); /* c11 */ |
---|
2496 | tmp13 += z2 + MULTIPLY(z1, FIX(0.475753014)) - z3; /* c7-c11 */ |
---|
2497 | tmp15 += z2 - MULTIPLY(z4, FIX(0.869244010)) + z3; /* c11+c13 */ |
---|
2498 | |
---|
2499 | /* Final output stage */ |
---|
2500 | |
---|
2501 | outptr[0] = range_limit[(int) RIGHT_SHIFT(tmp20 + tmp10, |
---|
2502 | CONST_BITS+PASS1_BITS+3) |
---|
2503 | & RANGE_MASK]; |
---|
2504 | outptr[14] = range_limit[(int) RIGHT_SHIFT(tmp20 - tmp10, |
---|
2505 | CONST_BITS+PASS1_BITS+3) |
---|
2506 | & RANGE_MASK]; |
---|
2507 | outptr[1] = range_limit[(int) RIGHT_SHIFT(tmp21 + tmp11, |
---|
2508 | CONST_BITS+PASS1_BITS+3) |
---|
2509 | & RANGE_MASK]; |
---|
2510 | outptr[13] = range_limit[(int) RIGHT_SHIFT(tmp21 - tmp11, |
---|
2511 | CONST_BITS+PASS1_BITS+3) |
---|
2512 | & RANGE_MASK]; |
---|
2513 | outptr[2] = range_limit[(int) RIGHT_SHIFT(tmp22 + tmp12, |
---|
2514 | CONST_BITS+PASS1_BITS+3) |
---|
2515 | & RANGE_MASK]; |
---|
2516 | outptr[12] = range_limit[(int) RIGHT_SHIFT(tmp22 - tmp12, |
---|
2517 | CONST_BITS+PASS1_BITS+3) |
---|
2518 | & RANGE_MASK]; |
---|
2519 | outptr[3] = range_limit[(int) RIGHT_SHIFT(tmp23 + tmp13, |
---|
2520 | CONST_BITS+PASS1_BITS+3) |
---|
2521 | & RANGE_MASK]; |
---|
2522 | outptr[11] = range_limit[(int) RIGHT_SHIFT(tmp23 - tmp13, |
---|
2523 | CONST_BITS+PASS1_BITS+3) |
---|
2524 | & RANGE_MASK]; |
---|
2525 | outptr[4] = range_limit[(int) RIGHT_SHIFT(tmp24 + tmp14, |
---|
2526 | CONST_BITS+PASS1_BITS+3) |
---|
2527 | & RANGE_MASK]; |
---|
2528 | outptr[10] = range_limit[(int) RIGHT_SHIFT(tmp24 - tmp14, |
---|
2529 | CONST_BITS+PASS1_BITS+3) |
---|
2530 | & RANGE_MASK]; |
---|
2531 | outptr[5] = range_limit[(int) RIGHT_SHIFT(tmp25 + tmp15, |
---|
2532 | CONST_BITS+PASS1_BITS+3) |
---|
2533 | & RANGE_MASK]; |
---|
2534 | outptr[9] = range_limit[(int) RIGHT_SHIFT(tmp25 - tmp15, |
---|
2535 | CONST_BITS+PASS1_BITS+3) |
---|
2536 | & RANGE_MASK]; |
---|
2537 | outptr[6] = range_limit[(int) RIGHT_SHIFT(tmp26 + tmp16, |
---|
2538 | CONST_BITS+PASS1_BITS+3) |
---|
2539 | & RANGE_MASK]; |
---|
2540 | outptr[8] = range_limit[(int) RIGHT_SHIFT(tmp26 - tmp16, |
---|
2541 | CONST_BITS+PASS1_BITS+3) |
---|
2542 | & RANGE_MASK]; |
---|
2543 | outptr[7] = range_limit[(int) RIGHT_SHIFT(tmp27, |
---|
2544 | CONST_BITS+PASS1_BITS+3) |
---|
2545 | & RANGE_MASK]; |
---|
2546 | |
---|
2547 | wsptr += 8; /* advance pointer to next row */ |
---|
2548 | } |
---|
2549 | } |
---|
2550 | |
---|
2551 | |
---|
2552 | /* |
---|
2553 | * Perform dequantization and inverse DCT on one block of coefficients, |
---|
2554 | * producing a 16x16 output block. |
---|
2555 | * |
---|
2556 | * Optimized algorithm with 28 multiplications in the 1-D kernel. |
---|
2557 | * cK represents sqrt(2) * cos(K*pi/32). |
---|
2558 | */ |
---|
2559 | |
---|
2560 | GLOBAL(void) |
---|
2561 | jpeg_idct_16x16 (j_decompress_ptr cinfo, jpeg_component_info * compptr, |
---|
2562 | JCOEFPTR coef_block, |
---|
2563 | JSAMPARRAY output_buf, JDIMENSION output_col) |
---|
2564 | { |
---|
2565 | INT32 tmp0, tmp1, tmp2, tmp3, tmp10, tmp11, tmp12, tmp13; |
---|
2566 | INT32 tmp20, tmp21, tmp22, tmp23, tmp24, tmp25, tmp26, tmp27; |
---|
2567 | INT32 z1, z2, z3, z4; |
---|
2568 | JCOEFPTR inptr; |
---|
2569 | ISLOW_MULT_TYPE * quantptr; |
---|
2570 | int * wsptr; |
---|
2571 | JSAMPROW outptr; |
---|
2572 | JSAMPLE *range_limit = IDCT_range_limit(cinfo); |
---|
2573 | int ctr; |
---|
2574 | int workspace[8*16]; /* buffers data between passes */ |
---|
2575 | SHIFT_TEMPS |
---|
2576 | |
---|
2577 | /* Pass 1: process columns from input, store into work array. */ |
---|
2578 | |
---|
2579 | inptr = coef_block; |
---|
2580 | quantptr = (ISLOW_MULT_TYPE *) compptr->dct_table; |
---|
2581 | wsptr = workspace; |
---|
2582 | for (ctr = 0; ctr < 8; ctr++, inptr++, quantptr++, wsptr++) { |
---|
2583 | /* Even part */ |
---|
2584 | |
---|
2585 | tmp0 = DEQUANTIZE(inptr[DCTSIZE*0], quantptr[DCTSIZE*0]); |
---|
2586 | tmp0 <<= CONST_BITS; |
---|
2587 | /* Add fudge factor here for final descale. */ |
---|
2588 | tmp0 += 1 << (CONST_BITS-PASS1_BITS-1); |
---|
2589 | |
---|
2590 | z1 = DEQUANTIZE(inptr[DCTSIZE*4], quantptr[DCTSIZE*4]); |
---|
2591 | tmp1 = MULTIPLY(z1, FIX(1.306562965)); /* c4[16] = c2[8] */ |
---|
2592 | tmp2 = MULTIPLY(z1, FIX_0_541196100); /* c12[16] = c6[8] */ |
---|
2593 | |
---|
2594 | tmp10 = tmp0 + tmp1; |
---|
2595 | tmp11 = tmp0 - tmp1; |
---|
2596 | tmp12 = tmp0 + tmp2; |
---|
2597 | tmp13 = tmp0 - tmp2; |
---|
2598 | |
---|
2599 | z1 = DEQUANTIZE(inptr[DCTSIZE*2], quantptr[DCTSIZE*2]); |
---|
2600 | z2 = DEQUANTIZE(inptr[DCTSIZE*6], quantptr[DCTSIZE*6]); |
---|
2601 | z3 = z1 - z2; |
---|
2602 | z4 = MULTIPLY(z3, FIX(0.275899379)); /* c14[16] = c7[8] */ |
---|
2603 | z3 = MULTIPLY(z3, FIX(1.387039845)); /* c2[16] = c1[8] */ |
---|
2604 | |
---|
2605 | tmp0 = z3 + MULTIPLY(z2, FIX_2_562915447); /* (c6+c2)[16] = (c3+c1)[8] */ |
---|
2606 | tmp1 = z4 + MULTIPLY(z1, FIX_0_899976223); /* (c6-c14)[16] = (c3-c7)[8] */ |
---|
2607 | tmp2 = z3 - MULTIPLY(z1, FIX(0.601344887)); /* (c2-c10)[16] = (c1-c5)[8] */ |
---|
2608 | tmp3 = z4 - MULTIPLY(z2, FIX(0.509795579)); /* (c10-c14)[16] = (c5-c7)[8] */ |
---|
2609 | |
---|
2610 | tmp20 = tmp10 + tmp0; |
---|
2611 | tmp27 = tmp10 - tmp0; |
---|
2612 | tmp21 = tmp12 + tmp1; |
---|
2613 | tmp26 = tmp12 - tmp1; |
---|
2614 | tmp22 = tmp13 + tmp2; |
---|
2615 | tmp25 = tmp13 - tmp2; |
---|
2616 | tmp23 = tmp11 + tmp3; |
---|
2617 | tmp24 = tmp11 - tmp3; |
---|
2618 | |
---|
2619 | /* Odd part */ |
---|
2620 | |
---|
2621 | z1 = DEQUANTIZE(inptr[DCTSIZE*1], quantptr[DCTSIZE*1]); |
---|
2622 | z2 = DEQUANTIZE(inptr[DCTSIZE*3], quantptr[DCTSIZE*3]); |
---|
2623 | z3 = DEQUANTIZE(inptr[DCTSIZE*5], quantptr[DCTSIZE*5]); |
---|
2624 | z4 = DEQUANTIZE(inptr[DCTSIZE*7], quantptr[DCTSIZE*7]); |
---|
2625 | |
---|
2626 | tmp11 = z1 + z3; |
---|
2627 | |
---|
2628 | tmp1 = MULTIPLY(z1 + z2, FIX(1.353318001)); /* c3 */ |
---|
2629 | tmp2 = MULTIPLY(tmp11, FIX(1.247225013)); /* c5 */ |
---|
2630 | tmp3 = MULTIPLY(z1 + z4, FIX(1.093201867)); /* c7 */ |
---|
2631 | tmp10 = MULTIPLY(z1 - z4, FIX(0.897167586)); /* c9 */ |
---|
2632 | tmp11 = MULTIPLY(tmp11, FIX(0.666655658)); /* c11 */ |
---|
2633 | tmp12 = MULTIPLY(z1 - z2, FIX(0.410524528)); /* c13 */ |
---|
2634 | tmp0 = tmp1 + tmp2 + tmp3 - |
---|
2635 | MULTIPLY(z1, FIX(2.286341144)); /* c7+c5+c3-c1 */ |
---|
2636 | tmp13 = tmp10 + tmp11 + tmp12 - |
---|
2637 | MULTIPLY(z1, FIX(1.835730603)); /* c9+c11+c13-c15 */ |
---|
2638 | z1 = MULTIPLY(z2 + z3, FIX(0.138617169)); /* c15 */ |
---|
2639 | tmp1 += z1 + MULTIPLY(z2, FIX(0.071888074)); /* c9+c11-c3-c15 */ |
---|
2640 | tmp2 += z1 - MULTIPLY(z3, FIX(1.125726048)); /* c5+c7+c15-c3 */ |
---|
2641 | z1 = MULTIPLY(z3 - z2, FIX(1.407403738)); /* c1 */ |
---|
2642 | tmp11 += z1 - MULTIPLY(z3, FIX(0.766367282)); /* c1+c11-c9-c13 */ |
---|
2643 | tmp12 += z1 + MULTIPLY(z2, FIX(1.971951411)); /* c1+c5+c13-c7 */ |
---|
2644 | z2 += z4; |
---|
2645 | z1 = MULTIPLY(z2, - FIX(0.666655658)); /* -c11 */ |
---|
2646 | tmp1 += z1; |
---|
2647 | tmp3 += z1 + MULTIPLY(z4, FIX(1.065388962)); /* c3+c11+c15-c7 */ |
---|
2648 | z2 = MULTIPLY(z2, - FIX(1.247225013)); /* -c5 */ |
---|
2649 | tmp10 += z2 + MULTIPLY(z4, FIX(3.141271809)); /* c1+c5+c9-c13 */ |
---|
2650 | tmp12 += z2; |
---|
2651 | z2 = MULTIPLY(z3 + z4, - FIX(1.353318001)); /* -c3 */ |
---|
2652 | tmp2 += z2; |
---|
2653 | tmp3 += z2; |
---|
2654 | z2 = MULTIPLY(z4 - z3, FIX(0.410524528)); /* c13 */ |
---|
2655 | tmp10 += z2; |
---|
2656 | tmp11 += z2; |
---|
2657 | |
---|
2658 | /* Final output stage */ |
---|
2659 | |
---|
2660 | wsptr[8*0] = (int) RIGHT_SHIFT(tmp20 + tmp0, CONST_BITS-PASS1_BITS); |
---|
2661 | wsptr[8*15] = (int) RIGHT_SHIFT(tmp20 - tmp0, CONST_BITS-PASS1_BITS); |
---|
2662 | wsptr[8*1] = (int) RIGHT_SHIFT(tmp21 + tmp1, CONST_BITS-PASS1_BITS); |
---|
2663 | wsptr[8*14] = (int) RIGHT_SHIFT(tmp21 - tmp1, CONST_BITS-PASS1_BITS); |
---|
2664 | wsptr[8*2] = (int) RIGHT_SHIFT(tmp22 + tmp2, CONST_BITS-PASS1_BITS); |
---|
2665 | wsptr[8*13] = (int) RIGHT_SHIFT(tmp22 - tmp2, CONST_BITS-PASS1_BITS); |
---|
2666 | wsptr[8*3] = (int) RIGHT_SHIFT(tmp23 + tmp3, CONST_BITS-PASS1_BITS); |
---|
2667 | wsptr[8*12] = (int) RIGHT_SHIFT(tmp23 - tmp3, CONST_BITS-PASS1_BITS); |
---|
2668 | wsptr[8*4] = (int) RIGHT_SHIFT(tmp24 + tmp10, CONST_BITS-PASS1_BITS); |
---|
2669 | wsptr[8*11] = (int) RIGHT_SHIFT(tmp24 - tmp10, CONST_BITS-PASS1_BITS); |
---|
2670 | wsptr[8*5] = (int) RIGHT_SHIFT(tmp25 + tmp11, CONST_BITS-PASS1_BITS); |
---|
2671 | wsptr[8*10] = (int) RIGHT_SHIFT(tmp25 - tmp11, CONST_BITS-PASS1_BITS); |
---|
2672 | wsptr[8*6] = (int) RIGHT_SHIFT(tmp26 + tmp12, CONST_BITS-PASS1_BITS); |
---|
2673 | wsptr[8*9] = (int) RIGHT_SHIFT(tmp26 - tmp12, CONST_BITS-PASS1_BITS); |
---|
2674 | wsptr[8*7] = (int) RIGHT_SHIFT(tmp27 + tmp13, CONST_BITS-PASS1_BITS); |
---|
2675 | wsptr[8*8] = (int) RIGHT_SHIFT(tmp27 - tmp13, CONST_BITS-PASS1_BITS); |
---|
2676 | } |
---|
2677 | |
---|
2678 | /* Pass 2: process 16 rows from work array, store into output array. */ |
---|
2679 | |
---|
2680 | wsptr = workspace; |
---|
2681 | for (ctr = 0; ctr < 16; ctr++) { |
---|
2682 | outptr = output_buf[ctr] + output_col; |
---|
2683 | |
---|
2684 | /* Even part */ |
---|
2685 | |
---|
2686 | /* Add fudge factor here for final descale. */ |
---|
2687 | tmp0 = (INT32) wsptr[0] + (ONE << (PASS1_BITS+2)); |
---|
2688 | tmp0 <<= CONST_BITS; |
---|
2689 | |
---|
2690 | z1 = (INT32) wsptr[4]; |
---|
2691 | tmp1 = MULTIPLY(z1, FIX(1.306562965)); /* c4[16] = c2[8] */ |
---|
2692 | tmp2 = MULTIPLY(z1, FIX_0_541196100); /* c12[16] = c6[8] */ |
---|
2693 | |
---|
2694 | tmp10 = tmp0 + tmp1; |
---|
2695 | tmp11 = tmp0 - tmp1; |
---|
2696 | tmp12 = tmp0 + tmp2; |
---|
2697 | tmp13 = tmp0 - tmp2; |
---|
2698 | |
---|
2699 | z1 = (INT32) wsptr[2]; |
---|
2700 | z2 = (INT32) wsptr[6]; |
---|
2701 | z3 = z1 - z2; |
---|
2702 | z4 = MULTIPLY(z3, FIX(0.275899379)); /* c14[16] = c7[8] */ |
---|
2703 | z3 = MULTIPLY(z3, FIX(1.387039845)); /* c2[16] = c1[8] */ |
---|
2704 | |
---|
2705 | tmp0 = z3 + MULTIPLY(z2, FIX_2_562915447); /* (c6+c2)[16] = (c3+c1)[8] */ |
---|
2706 | tmp1 = z4 + MULTIPLY(z1, FIX_0_899976223); /* (c6-c14)[16] = (c3-c7)[8] */ |
---|
2707 | tmp2 = z3 - MULTIPLY(z1, FIX(0.601344887)); /* (c2-c10)[16] = (c1-c5)[8] */ |
---|
2708 | tmp3 = z4 - MULTIPLY(z2, FIX(0.509795579)); /* (c10-c14)[16] = (c5-c7)[8] */ |
---|
2709 | |
---|
2710 | tmp20 = tmp10 + tmp0; |
---|
2711 | tmp27 = tmp10 - tmp0; |
---|
2712 | tmp21 = tmp12 + tmp1; |
---|
2713 | tmp26 = tmp12 - tmp1; |
---|
2714 | tmp22 = tmp13 + tmp2; |
---|
2715 | tmp25 = tmp13 - tmp2; |
---|
2716 | tmp23 = tmp11 + tmp3; |
---|
2717 | tmp24 = tmp11 - tmp3; |
---|
2718 | |
---|
2719 | /* Odd part */ |
---|
2720 | |
---|
2721 | z1 = (INT32) wsptr[1]; |
---|
2722 | z2 = (INT32) wsptr[3]; |
---|
2723 | z3 = (INT32) wsptr[5]; |
---|
2724 | z4 = (INT32) wsptr[7]; |
---|
2725 | |
---|
2726 | tmp11 = z1 + z3; |
---|
2727 | |
---|
2728 | tmp1 = MULTIPLY(z1 + z2, FIX(1.353318001)); /* c3 */ |
---|
2729 | tmp2 = MULTIPLY(tmp11, FIX(1.247225013)); /* c5 */ |
---|
2730 | tmp3 = MULTIPLY(z1 + z4, FIX(1.093201867)); /* c7 */ |
---|
2731 | tmp10 = MULTIPLY(z1 - z4, FIX(0.897167586)); /* c9 */ |
---|
2732 | tmp11 = MULTIPLY(tmp11, FIX(0.666655658)); /* c11 */ |
---|
2733 | tmp12 = MULTIPLY(z1 - z2, FIX(0.410524528)); /* c13 */ |
---|
2734 | tmp0 = tmp1 + tmp2 + tmp3 - |
---|
2735 | MULTIPLY(z1, FIX(2.286341144)); /* c7+c5+c3-c1 */ |
---|
2736 | tmp13 = tmp10 + tmp11 + tmp12 - |
---|
2737 | MULTIPLY(z1, FIX(1.835730603)); /* c9+c11+c13-c15 */ |
---|
2738 | z1 = MULTIPLY(z2 + z3, FIX(0.138617169)); /* c15 */ |
---|
2739 | tmp1 += z1 + MULTIPLY(z2, FIX(0.071888074)); /* c9+c11-c3-c15 */ |
---|
2740 | tmp2 += z1 - MULTIPLY(z3, FIX(1.125726048)); /* c5+c7+c15-c3 */ |
---|
2741 | z1 = MULTIPLY(z3 - z2, FIX(1.407403738)); /* c1 */ |
---|
2742 | tmp11 += z1 - MULTIPLY(z3, FIX(0.766367282)); /* c1+c11-c9-c13 */ |
---|
2743 | tmp12 += z1 + MULTIPLY(z2, FIX(1.971951411)); /* c1+c5+c13-c7 */ |
---|
2744 | z2 += z4; |
---|
2745 | z1 = MULTIPLY(z2, - FIX(0.666655658)); /* -c11 */ |
---|
2746 | tmp1 += z1; |
---|
2747 | tmp3 += z1 + MULTIPLY(z4, FIX(1.065388962)); /* c3+c11+c15-c7 */ |
---|
2748 | z2 = MULTIPLY(z2, - FIX(1.247225013)); /* -c5 */ |
---|
2749 | tmp10 += z2 + MULTIPLY(z4, FIX(3.141271809)); /* c1+c5+c9-c13 */ |
---|
2750 | tmp12 += z2; |
---|
2751 | z2 = MULTIPLY(z3 + z4, - FIX(1.353318001)); /* -c3 */ |
---|
2752 | tmp2 += z2; |
---|
2753 | tmp3 += z2; |
---|
2754 | z2 = MULTIPLY(z4 - z3, FIX(0.410524528)); /* c13 */ |
---|
2755 | tmp10 += z2; |
---|
2756 | tmp11 += z2; |
---|
2757 | |
---|
2758 | /* Final output stage */ |
---|
2759 | |
---|
2760 | outptr[0] = range_limit[(int) RIGHT_SHIFT(tmp20 + tmp0, |
---|
2761 | CONST_BITS+PASS1_BITS+3) |
---|
2762 | & RANGE_MASK]; |
---|
2763 | outptr[15] = range_limit[(int) RIGHT_SHIFT(tmp20 - tmp0, |
---|
2764 | CONST_BITS+PASS1_BITS+3) |
---|
2765 | & RANGE_MASK]; |
---|
2766 | outptr[1] = range_limit[(int) RIGHT_SHIFT(tmp21 + tmp1, |
---|
2767 | CONST_BITS+PASS1_BITS+3) |
---|
2768 | & RANGE_MASK]; |
---|
2769 | outptr[14] = range_limit[(int) RIGHT_SHIFT(tmp21 - tmp1, |
---|
2770 | CONST_BITS+PASS1_BITS+3) |
---|
2771 | & RANGE_MASK]; |
---|
2772 | outptr[2] = range_limit[(int) RIGHT_SHIFT(tmp22 + tmp2, |
---|
2773 | CONST_BITS+PASS1_BITS+3) |
---|
2774 | & RANGE_MASK]; |
---|
2775 | outptr[13] = range_limit[(int) RIGHT_SHIFT(tmp22 - tmp2, |
---|
2776 | CONST_BITS+PASS1_BITS+3) |
---|
2777 | & RANGE_MASK]; |
---|
2778 | outptr[3] = range_limit[(int) RIGHT_SHIFT(tmp23 + tmp3, |
---|
2779 | CONST_BITS+PASS1_BITS+3) |
---|
2780 | & RANGE_MASK]; |
---|
2781 | outptr[12] = range_limit[(int) RIGHT_SHIFT(tmp23 - tmp3, |
---|
2782 | CONST_BITS+PASS1_BITS+3) |
---|
2783 | & RANGE_MASK]; |
---|
2784 | outptr[4] = range_limit[(int) RIGHT_SHIFT(tmp24 + tmp10, |
---|
2785 | CONST_BITS+PASS1_BITS+3) |
---|
2786 | & RANGE_MASK]; |
---|
2787 | outptr[11] = range_limit[(int) RIGHT_SHIFT(tmp24 - tmp10, |
---|
2788 | CONST_BITS+PASS1_BITS+3) |
---|
2789 | & RANGE_MASK]; |
---|
2790 | outptr[5] = range_limit[(int) RIGHT_SHIFT(tmp25 + tmp11, |
---|
2791 | CONST_BITS+PASS1_BITS+3) |
---|
2792 | & RANGE_MASK]; |
---|
2793 | outptr[10] = range_limit[(int) RIGHT_SHIFT(tmp25 - tmp11, |
---|
2794 | CONST_BITS+PASS1_BITS+3) |
---|
2795 | & RANGE_MASK]; |
---|
2796 | outptr[6] = range_limit[(int) RIGHT_SHIFT(tmp26 + tmp12, |
---|
2797 | CONST_BITS+PASS1_BITS+3) |
---|
2798 | & RANGE_MASK]; |
---|
2799 | outptr[9] = range_limit[(int) RIGHT_SHIFT(tmp26 - tmp12, |
---|
2800 | CONST_BITS+PASS1_BITS+3) |
---|
2801 | & RANGE_MASK]; |
---|
2802 | outptr[7] = range_limit[(int) RIGHT_SHIFT(tmp27 + tmp13, |
---|
2803 | CONST_BITS+PASS1_BITS+3) |
---|
2804 | & RANGE_MASK]; |
---|
2805 | outptr[8] = range_limit[(int) RIGHT_SHIFT(tmp27 - tmp13, |
---|
2806 | CONST_BITS+PASS1_BITS+3) |
---|
2807 | & RANGE_MASK]; |
---|
2808 | |
---|
2809 | wsptr += 8; /* advance pointer to next row */ |
---|
2810 | } |
---|
2811 | } |
---|
2812 | |
---|
2813 | |
---|
2814 | /* |
---|
2815 | * Perform dequantization and inverse DCT on one block of coefficients, |
---|
2816 | * producing a 16x8 output block. |
---|
2817 | * |
---|
2818 | * 8-point IDCT in pass 1 (columns), 16-point in pass 2 (rows). |
---|
2819 | */ |
---|
2820 | |
---|
2821 | GLOBAL(void) |
---|
2822 | jpeg_idct_16x8 (j_decompress_ptr cinfo, jpeg_component_info * compptr, |
---|
2823 | JCOEFPTR coef_block, |
---|
2824 | JSAMPARRAY output_buf, JDIMENSION output_col) |
---|
2825 | { |
---|
2826 | INT32 tmp0, tmp1, tmp2, tmp3, tmp10, tmp11, tmp12, tmp13; |
---|
2827 | INT32 tmp20, tmp21, tmp22, tmp23, tmp24, tmp25, tmp26, tmp27; |
---|
2828 | INT32 z1, z2, z3, z4; |
---|
2829 | JCOEFPTR inptr; |
---|
2830 | ISLOW_MULT_TYPE * quantptr; |
---|
2831 | int * wsptr; |
---|
2832 | JSAMPROW outptr; |
---|
2833 | JSAMPLE *range_limit = IDCT_range_limit(cinfo); |
---|
2834 | int ctr; |
---|
2835 | int workspace[8*8]; /* buffers data between passes */ |
---|
2836 | SHIFT_TEMPS |
---|
2837 | |
---|
2838 | /* Pass 1: process columns from input, store into work array. */ |
---|
2839 | /* Note results are scaled up by sqrt(8) compared to a true IDCT; */ |
---|
2840 | /* furthermore, we scale the results by 2**PASS1_BITS. */ |
---|
2841 | |
---|
2842 | inptr = coef_block; |
---|
2843 | quantptr = (ISLOW_MULT_TYPE *) compptr->dct_table; |
---|
2844 | wsptr = workspace; |
---|
2845 | for (ctr = DCTSIZE; ctr > 0; ctr--) { |
---|
2846 | /* Due to quantization, we will usually find that many of the input |
---|
2847 | * coefficients are zero, especially the AC terms. We can exploit this |
---|
2848 | * by short-circuiting the IDCT calculation for any column in which all |
---|
2849 | * the AC terms are zero. In that case each output is equal to the |
---|
2850 | * DC coefficient (with scale factor as needed). |
---|
2851 | * With typical images and quantization tables, half or more of the |
---|
2852 | * column DCT calculations can be simplified this way. |
---|
2853 | */ |
---|
2854 | |
---|
2855 | if (inptr[DCTSIZE*1] == 0 && inptr[DCTSIZE*2] == 0 && |
---|
2856 | inptr[DCTSIZE*3] == 0 && inptr[DCTSIZE*4] == 0 && |
---|
2857 | inptr[DCTSIZE*5] == 0 && inptr[DCTSIZE*6] == 0 && |
---|
2858 | inptr[DCTSIZE*7] == 0) { |
---|
2859 | /* AC terms all zero */ |
---|
2860 | int dcval = DEQUANTIZE(inptr[DCTSIZE*0], quantptr[DCTSIZE*0]) << PASS1_BITS; |
---|
2861 | |
---|
2862 | wsptr[DCTSIZE*0] = dcval; |
---|
2863 | wsptr[DCTSIZE*1] = dcval; |
---|
2864 | wsptr[DCTSIZE*2] = dcval; |
---|
2865 | wsptr[DCTSIZE*3] = dcval; |
---|
2866 | wsptr[DCTSIZE*4] = dcval; |
---|
2867 | wsptr[DCTSIZE*5] = dcval; |
---|
2868 | wsptr[DCTSIZE*6] = dcval; |
---|
2869 | wsptr[DCTSIZE*7] = dcval; |
---|
2870 | |
---|
2871 | inptr++; /* advance pointers to next column */ |
---|
2872 | quantptr++; |
---|
2873 | wsptr++; |
---|
2874 | continue; |
---|
2875 | } |
---|
2876 | |
---|
2877 | /* Even part: reverse the even part of the forward DCT. */ |
---|
2878 | /* The rotator is sqrt(2)*c(-6). */ |
---|
2879 | |
---|
2880 | z2 = DEQUANTIZE(inptr[DCTSIZE*2], quantptr[DCTSIZE*2]); |
---|
2881 | z3 = DEQUANTIZE(inptr[DCTSIZE*6], quantptr[DCTSIZE*6]); |
---|
2882 | |
---|
2883 | z1 = MULTIPLY(z2 + z3, FIX_0_541196100); |
---|
2884 | tmp2 = z1 + MULTIPLY(z2, FIX_0_765366865); |
---|
2885 | tmp3 = z1 - MULTIPLY(z3, FIX_1_847759065); |
---|
2886 | |
---|
2887 | z2 = DEQUANTIZE(inptr[DCTSIZE*0], quantptr[DCTSIZE*0]); |
---|
2888 | z3 = DEQUANTIZE(inptr[DCTSIZE*4], quantptr[DCTSIZE*4]); |
---|
2889 | z2 <<= CONST_BITS; |
---|
2890 | z3 <<= CONST_BITS; |
---|
2891 | /* Add fudge factor here for final descale. */ |
---|
2892 | z2 += ONE << (CONST_BITS-PASS1_BITS-1); |
---|
2893 | |
---|
2894 | tmp0 = z2 + z3; |
---|
2895 | tmp1 = z2 - z3; |
---|
2896 | |
---|
2897 | tmp10 = tmp0 + tmp2; |
---|
2898 | tmp13 = tmp0 - tmp2; |
---|
2899 | tmp11 = tmp1 + tmp3; |
---|
2900 | tmp12 = tmp1 - tmp3; |
---|
2901 | |
---|
2902 | /* Odd part per figure 8; the matrix is unitary and hence its |
---|
2903 | * transpose is its inverse. i0..i3 are y7,y5,y3,y1 respectively. |
---|
2904 | */ |
---|
2905 | |
---|
2906 | tmp0 = DEQUANTIZE(inptr[DCTSIZE*7], quantptr[DCTSIZE*7]); |
---|
2907 | tmp1 = DEQUANTIZE(inptr[DCTSIZE*5], quantptr[DCTSIZE*5]); |
---|
2908 | tmp2 = DEQUANTIZE(inptr[DCTSIZE*3], quantptr[DCTSIZE*3]); |
---|
2909 | tmp3 = DEQUANTIZE(inptr[DCTSIZE*1], quantptr[DCTSIZE*1]); |
---|
2910 | |
---|
2911 | z2 = tmp0 + tmp2; |
---|
2912 | z3 = tmp1 + tmp3; |
---|
2913 | |
---|
2914 | z1 = MULTIPLY(z2 + z3, FIX_1_175875602); /* sqrt(2) * c3 */ |
---|
2915 | z2 = MULTIPLY(z2, - FIX_1_961570560); /* sqrt(2) * (-c3-c5) */ |
---|
2916 | z3 = MULTIPLY(z3, - FIX_0_390180644); /* sqrt(2) * (c5-c3) */ |
---|
2917 | z2 += z1; |
---|
2918 | z3 += z1; |
---|
2919 | |
---|
2920 | z1 = MULTIPLY(tmp0 + tmp3, - FIX_0_899976223); /* sqrt(2) * (c7-c3) */ |
---|
2921 | tmp0 = MULTIPLY(tmp0, FIX_0_298631336); /* sqrt(2) * (-c1+c3+c5-c7) */ |
---|
2922 | tmp3 = MULTIPLY(tmp3, FIX_1_501321110); /* sqrt(2) * ( c1+c3-c5-c7) */ |
---|
2923 | tmp0 += z1 + z2; |
---|
2924 | tmp3 += z1 + z3; |
---|
2925 | |
---|
2926 | z1 = MULTIPLY(tmp1 + tmp2, - FIX_2_562915447); /* sqrt(2) * (-c1-c3) */ |
---|
2927 | tmp1 = MULTIPLY(tmp1, FIX_2_053119869); /* sqrt(2) * ( c1+c3-c5+c7) */ |
---|
2928 | tmp2 = MULTIPLY(tmp2, FIX_3_072711026); /* sqrt(2) * ( c1+c3+c5-c7) */ |
---|
2929 | tmp1 += z1 + z3; |
---|
2930 | tmp2 += z1 + z2; |
---|
2931 | |
---|
2932 | /* Final output stage: inputs are tmp10..tmp13, tmp0..tmp3 */ |
---|
2933 | |
---|
2934 | wsptr[DCTSIZE*0] = (int) RIGHT_SHIFT(tmp10 + tmp3, CONST_BITS-PASS1_BITS); |
---|
2935 | wsptr[DCTSIZE*7] = (int) RIGHT_SHIFT(tmp10 - tmp3, CONST_BITS-PASS1_BITS); |
---|
2936 | wsptr[DCTSIZE*1] = (int) RIGHT_SHIFT(tmp11 + tmp2, CONST_BITS-PASS1_BITS); |
---|
2937 | wsptr[DCTSIZE*6] = (int) RIGHT_SHIFT(tmp11 - tmp2, CONST_BITS-PASS1_BITS); |
---|
2938 | wsptr[DCTSIZE*2] = (int) RIGHT_SHIFT(tmp12 + tmp1, CONST_BITS-PASS1_BITS); |
---|
2939 | wsptr[DCTSIZE*5] = (int) RIGHT_SHIFT(tmp12 - tmp1, CONST_BITS-PASS1_BITS); |
---|
2940 | wsptr[DCTSIZE*3] = (int) RIGHT_SHIFT(tmp13 + tmp0, CONST_BITS-PASS1_BITS); |
---|
2941 | wsptr[DCTSIZE*4] = (int) RIGHT_SHIFT(tmp13 - tmp0, CONST_BITS-PASS1_BITS); |
---|
2942 | |
---|
2943 | inptr++; /* advance pointers to next column */ |
---|
2944 | quantptr++; |
---|
2945 | wsptr++; |
---|
2946 | } |
---|
2947 | |
---|
2948 | /* Pass 2: process 8 rows from work array, store into output array. |
---|
2949 | * 16-point IDCT kernel, cK represents sqrt(2) * cos(K*pi/32). |
---|
2950 | */ |
---|
2951 | wsptr = workspace; |
---|
2952 | for (ctr = 0; ctr < 8; ctr++) { |
---|
2953 | outptr = output_buf[ctr] + output_col; |
---|
2954 | |
---|
2955 | /* Even part */ |
---|
2956 | |
---|
2957 | /* Add fudge factor here for final descale. */ |
---|
2958 | tmp0 = (INT32) wsptr[0] + (ONE << (PASS1_BITS+2)); |
---|
2959 | tmp0 <<= CONST_BITS; |
---|
2960 | |
---|
2961 | z1 = (INT32) wsptr[4]; |
---|
2962 | tmp1 = MULTIPLY(z1, FIX(1.306562965)); /* c4[16] = c2[8] */ |
---|
2963 | tmp2 = MULTIPLY(z1, FIX_0_541196100); /* c12[16] = c6[8] */ |
---|
2964 | |
---|
2965 | tmp10 = tmp0 + tmp1; |
---|
2966 | tmp11 = tmp0 - tmp1; |
---|
2967 | tmp12 = tmp0 + tmp2; |
---|
2968 | tmp13 = tmp0 - tmp2; |
---|
2969 | |
---|
2970 | z1 = (INT32) wsptr[2]; |
---|
2971 | z2 = (INT32) wsptr[6]; |
---|
2972 | z3 = z1 - z2; |
---|
2973 | z4 = MULTIPLY(z3, FIX(0.275899379)); /* c14[16] = c7[8] */ |
---|
2974 | z3 = MULTIPLY(z3, FIX(1.387039845)); /* c2[16] = c1[8] */ |
---|
2975 | |
---|
2976 | tmp0 = z3 + MULTIPLY(z2, FIX_2_562915447); /* (c6+c2)[16] = (c3+c1)[8] */ |
---|
2977 | tmp1 = z4 + MULTIPLY(z1, FIX_0_899976223); /* (c6-c14)[16] = (c3-c7)[8] */ |
---|
2978 | tmp2 = z3 - MULTIPLY(z1, FIX(0.601344887)); /* (c2-c10)[16] = (c1-c5)[8] */ |
---|
2979 | tmp3 = z4 - MULTIPLY(z2, FIX(0.509795579)); /* (c10-c14)[16] = (c5-c7)[8] */ |
---|
2980 | |
---|
2981 | tmp20 = tmp10 + tmp0; |
---|
2982 | tmp27 = tmp10 - tmp0; |
---|
2983 | tmp21 = tmp12 + tmp1; |
---|
2984 | tmp26 = tmp12 - tmp1; |
---|
2985 | tmp22 = tmp13 + tmp2; |
---|
2986 | tmp25 = tmp13 - tmp2; |
---|
2987 | tmp23 = tmp11 + tmp3; |
---|
2988 | tmp24 = tmp11 - tmp3; |
---|
2989 | |
---|
2990 | /* Odd part */ |
---|
2991 | |
---|
2992 | z1 = (INT32) wsptr[1]; |
---|
2993 | z2 = (INT32) wsptr[3]; |
---|
2994 | z3 = (INT32) wsptr[5]; |
---|
2995 | z4 = (INT32) wsptr[7]; |
---|
2996 | |
---|
2997 | tmp11 = z1 + z3; |
---|
2998 | |
---|
2999 | tmp1 = MULTIPLY(z1 + z2, FIX(1.353318001)); /* c3 */ |
---|
3000 | tmp2 = MULTIPLY(tmp11, FIX(1.247225013)); /* c5 */ |
---|
3001 | tmp3 = MULTIPLY(z1 + z4, FIX(1.093201867)); /* c7 */ |
---|
3002 | tmp10 = MULTIPLY(z1 - z4, FIX(0.897167586)); /* c9 */ |
---|
3003 | tmp11 = MULTIPLY(tmp11, FIX(0.666655658)); /* c11 */ |
---|
3004 | tmp12 = MULTIPLY(z1 - z2, FIX(0.410524528)); /* c13 */ |
---|
3005 | tmp0 = tmp1 + tmp2 + tmp3 - |
---|
3006 | MULTIPLY(z1, FIX(2.286341144)); /* c7+c5+c3-c1 */ |
---|
3007 | tmp13 = tmp10 + tmp11 + tmp12 - |
---|
3008 | MULTIPLY(z1, FIX(1.835730603)); /* c9+c11+c13-c15 */ |
---|
3009 | z1 = MULTIPLY(z2 + z3, FIX(0.138617169)); /* c15 */ |
---|
3010 | tmp1 += z1 + MULTIPLY(z2, FIX(0.071888074)); /* c9+c11-c3-c15 */ |
---|
3011 | tmp2 += z1 - MULTIPLY(z3, FIX(1.125726048)); /* c5+c7+c15-c3 */ |
---|
3012 | z1 = MULTIPLY(z3 - z2, FIX(1.407403738)); /* c1 */ |
---|
3013 | tmp11 += z1 - MULTIPLY(z3, FIX(0.766367282)); /* c1+c11-c9-c13 */ |
---|
3014 | tmp12 += z1 + MULTIPLY(z2, FIX(1.971951411)); /* c1+c5+c13-c7 */ |
---|
3015 | z2 += z4; |
---|
3016 | z1 = MULTIPLY(z2, - FIX(0.666655658)); /* -c11 */ |
---|
3017 | tmp1 += z1; |
---|
3018 | tmp3 += z1 + MULTIPLY(z4, FIX(1.065388962)); /* c3+c11+c15-c7 */ |
---|
3019 | z2 = MULTIPLY(z2, - FIX(1.247225013)); /* -c5 */ |
---|
3020 | tmp10 += z2 + MULTIPLY(z4, FIX(3.141271809)); /* c1+c5+c9-c13 */ |
---|
3021 | tmp12 += z2; |
---|
3022 | z2 = MULTIPLY(z3 + z4, - FIX(1.353318001)); /* -c3 */ |
---|
3023 | tmp2 += z2; |
---|
3024 | tmp3 += z2; |
---|
3025 | z2 = MULTIPLY(z4 - z3, FIX(0.410524528)); /* c13 */ |
---|
3026 | tmp10 += z2; |
---|
3027 | tmp11 += z2; |
---|
3028 | |
---|
3029 | /* Final output stage */ |
---|
3030 | |
---|
3031 | outptr[0] = range_limit[(int) RIGHT_SHIFT(tmp20 + tmp0, |
---|
3032 | CONST_BITS+PASS1_BITS+3) |
---|
3033 | & RANGE_MASK]; |
---|
3034 | outptr[15] = range_limit[(int) RIGHT_SHIFT(tmp20 - tmp0, |
---|
3035 | CONST_BITS+PASS1_BITS+3) |
---|
3036 | & RANGE_MASK]; |
---|
3037 | outptr[1] = range_limit[(int) RIGHT_SHIFT(tmp21 + tmp1, |
---|
3038 | CONST_BITS+PASS1_BITS+3) |
---|
3039 | & RANGE_MASK]; |
---|
3040 | outptr[14] = range_limit[(int) RIGHT_SHIFT(tmp21 - tmp1, |
---|
3041 | CONST_BITS+PASS1_BITS+3) |
---|
3042 | & RANGE_MASK]; |
---|
3043 | outptr[2] = range_limit[(int) RIGHT_SHIFT(tmp22 + tmp2, |
---|
3044 | CONST_BITS+PASS1_BITS+3) |
---|
3045 | & RANGE_MASK]; |
---|
3046 | outptr[13] = range_limit[(int) RIGHT_SHIFT(tmp22 - tmp2, |
---|
3047 | CONST_BITS+PASS1_BITS+3) |
---|
3048 | & RANGE_MASK]; |
---|
3049 | outptr[3] = range_limit[(int) RIGHT_SHIFT(tmp23 + tmp3, |
---|
3050 | CONST_BITS+PASS1_BITS+3) |
---|
3051 | & RANGE_MASK]; |
---|
3052 | outptr[12] = range_limit[(int) RIGHT_SHIFT(tmp23 - tmp3, |
---|
3053 | CONST_BITS+PASS1_BITS+3) |
---|
3054 | & RANGE_MASK]; |
---|
3055 | outptr[4] = range_limit[(int) RIGHT_SHIFT(tmp24 + tmp10, |
---|
3056 | CONST_BITS+PASS1_BITS+3) |
---|
3057 | & RANGE_MASK]; |
---|
3058 | outptr[11] = range_limit[(int) RIGHT_SHIFT(tmp24 - tmp10, |
---|
3059 | CONST_BITS+PASS1_BITS+3) |
---|
3060 | & RANGE_MASK]; |
---|
3061 | outptr[5] = range_limit[(int) RIGHT_SHIFT(tmp25 + tmp11, |
---|
3062 | CONST_BITS+PASS1_BITS+3) |
---|
3063 | & RANGE_MASK]; |
---|
3064 | outptr[10] = range_limit[(int) RIGHT_SHIFT(tmp25 - tmp11, |
---|
3065 | CONST_BITS+PASS1_BITS+3) |
---|
3066 | & RANGE_MASK]; |
---|
3067 | outptr[6] = range_limit[(int) RIGHT_SHIFT(tmp26 + tmp12, |
---|
3068 | CONST_BITS+PASS1_BITS+3) |
---|
3069 | & RANGE_MASK]; |
---|
3070 | outptr[9] = range_limit[(int) RIGHT_SHIFT(tmp26 - tmp12, |
---|
3071 | CONST_BITS+PASS1_BITS+3) |
---|
3072 | & RANGE_MASK]; |
---|
3073 | outptr[7] = range_limit[(int) RIGHT_SHIFT(tmp27 + tmp13, |
---|
3074 | CONST_BITS+PASS1_BITS+3) |
---|
3075 | & RANGE_MASK]; |
---|
3076 | outptr[8] = range_limit[(int) RIGHT_SHIFT(tmp27 - tmp13, |
---|
3077 | CONST_BITS+PASS1_BITS+3) |
---|
3078 | & RANGE_MASK]; |
---|
3079 | |
---|
3080 | wsptr += 8; /* advance pointer to next row */ |
---|
3081 | } |
---|
3082 | } |
---|
3083 | |
---|
3084 | |
---|
3085 | /* |
---|
3086 | * Perform dequantization and inverse DCT on one block of coefficients, |
---|
3087 | * producing a 14x7 output block. |
---|
3088 | * |
---|
3089 | * 7-point IDCT in pass 1 (columns), 14-point in pass 2 (rows). |
---|
3090 | */ |
---|
3091 | |
---|
3092 | GLOBAL(void) |
---|
3093 | jpeg_idct_14x7 (j_decompress_ptr cinfo, jpeg_component_info * compptr, |
---|
3094 | JCOEFPTR coef_block, |
---|
3095 | JSAMPARRAY output_buf, JDIMENSION output_col) |
---|
3096 | { |
---|
3097 | INT32 tmp10, tmp11, tmp12, tmp13, tmp14, tmp15, tmp16; |
---|
3098 | INT32 tmp20, tmp21, tmp22, tmp23, tmp24, tmp25, tmp26; |
---|
3099 | INT32 z1, z2, z3, z4; |
---|
3100 | JCOEFPTR inptr; |
---|
3101 | ISLOW_MULT_TYPE * quantptr; |
---|
3102 | int * wsptr; |
---|
3103 | JSAMPROW outptr; |
---|
3104 | JSAMPLE *range_limit = IDCT_range_limit(cinfo); |
---|
3105 | int ctr; |
---|
3106 | int workspace[8*7]; /* buffers data between passes */ |
---|
3107 | SHIFT_TEMPS |
---|
3108 | |
---|
3109 | /* Pass 1: process columns from input, store into work array. |
---|
3110 | * 7-point IDCT kernel, cK represents sqrt(2) * cos(K*pi/14). |
---|
3111 | */ |
---|
3112 | inptr = coef_block; |
---|
3113 | quantptr = (ISLOW_MULT_TYPE *) compptr->dct_table; |
---|
3114 | wsptr = workspace; |
---|
3115 | for (ctr = 0; ctr < 8; ctr++, inptr++, quantptr++, wsptr++) { |
---|
3116 | /* Even part */ |
---|
3117 | |
---|
3118 | tmp23 = DEQUANTIZE(inptr[DCTSIZE*0], quantptr[DCTSIZE*0]); |
---|
3119 | tmp23 <<= CONST_BITS; |
---|
3120 | /* Add fudge factor here for final descale. */ |
---|
3121 | tmp23 += ONE << (CONST_BITS-PASS1_BITS-1); |
---|
3122 | |
---|
3123 | z1 = DEQUANTIZE(inptr[DCTSIZE*2], quantptr[DCTSIZE*2]); |
---|
3124 | z2 = DEQUANTIZE(inptr[DCTSIZE*4], quantptr[DCTSIZE*4]); |
---|
3125 | z3 = DEQUANTIZE(inptr[DCTSIZE*6], quantptr[DCTSIZE*6]); |
---|
3126 | |
---|
3127 | tmp20 = MULTIPLY(z2 - z3, FIX(0.881747734)); /* c4 */ |
---|
3128 | tmp22 = MULTIPLY(z1 - z2, FIX(0.314692123)); /* c6 */ |
---|
3129 | tmp21 = tmp20 + tmp22 + tmp23 - MULTIPLY(z2, FIX(1.841218003)); /* c2+c4-c6 */ |
---|
3130 | tmp10 = z1 + z3; |
---|
3131 | z2 -= tmp10; |
---|
3132 | tmp10 = MULTIPLY(tmp10, FIX(1.274162392)) + tmp23; /* c2 */ |
---|
3133 | tmp20 += tmp10 - MULTIPLY(z3, FIX(0.077722536)); /* c2-c4-c6 */ |
---|
3134 | tmp22 += tmp10 - MULTIPLY(z1, FIX(2.470602249)); /* c2+c4+c6 */ |
---|
3135 | tmp23 += MULTIPLY(z2, FIX(1.414213562)); /* c0 */ |
---|
3136 | |
---|
3137 | /* Odd part */ |
---|
3138 | |
---|
3139 | z1 = DEQUANTIZE(inptr[DCTSIZE*1], quantptr[DCTSIZE*1]); |
---|
3140 | z2 = DEQUANTIZE(inptr[DCTSIZE*3], quantptr[DCTSIZE*3]); |
---|
3141 | z3 = DEQUANTIZE(inptr[DCTSIZE*5], quantptr[DCTSIZE*5]); |
---|
3142 | |
---|
3143 | tmp11 = MULTIPLY(z1 + z2, FIX(0.935414347)); /* (c3+c1-c5)/2 */ |
---|
3144 | tmp12 = MULTIPLY(z1 - z2, FIX(0.170262339)); /* (c3+c5-c1)/2 */ |
---|
3145 | tmp10 = tmp11 - tmp12; |
---|
3146 | tmp11 += tmp12; |
---|
3147 | tmp12 = MULTIPLY(z2 + z3, - FIX(1.378756276)); /* -c1 */ |
---|
3148 | tmp11 += tmp12; |
---|
3149 | z2 = MULTIPLY(z1 + z3, FIX(0.613604268)); /* c5 */ |
---|
3150 | tmp10 += z2; |
---|
3151 | tmp12 += z2 + MULTIPLY(z3, FIX(1.870828693)); /* c3+c1-c5 */ |
---|
3152 | |
---|
3153 | /* Final output stage */ |
---|
3154 | |
---|
3155 | wsptr[8*0] = (int) RIGHT_SHIFT(tmp20 + tmp10, CONST_BITS-PASS1_BITS); |
---|
3156 | wsptr[8*6] = (int) RIGHT_SHIFT(tmp20 - tmp10, CONST_BITS-PASS1_BITS); |
---|
3157 | wsptr[8*1] = (int) RIGHT_SHIFT(tmp21 + tmp11, CONST_BITS-PASS1_BITS); |
---|
3158 | wsptr[8*5] = (int) RIGHT_SHIFT(tmp21 - tmp11, CONST_BITS-PASS1_BITS); |
---|
3159 | wsptr[8*2] = (int) RIGHT_SHIFT(tmp22 + tmp12, CONST_BITS-PASS1_BITS); |
---|
3160 | wsptr[8*4] = (int) RIGHT_SHIFT(tmp22 - tmp12, CONST_BITS-PASS1_BITS); |
---|
3161 | wsptr[8*3] = (int) RIGHT_SHIFT(tmp23, CONST_BITS-PASS1_BITS); |
---|
3162 | } |
---|
3163 | |
---|
3164 | /* Pass 2: process 7 rows from work array, store into output array. |
---|
3165 | * 14-point IDCT kernel, cK represents sqrt(2) * cos(K*pi/28). |
---|
3166 | */ |
---|
3167 | wsptr = workspace; |
---|
3168 | for (ctr = 0; ctr < 7; ctr++) { |
---|
3169 | outptr = output_buf[ctr] + output_col; |
---|
3170 | |
---|
3171 | /* Even part */ |
---|
3172 | |
---|
3173 | /* Add fudge factor here for final descale. */ |
---|
3174 | z1 = (INT32) wsptr[0] + (ONE << (PASS1_BITS+2)); |
---|
3175 | z1 <<= CONST_BITS; |
---|
3176 | z4 = (INT32) wsptr[4]; |
---|
3177 | z2 = MULTIPLY(z4, FIX(1.274162392)); /* c4 */ |
---|
3178 | z3 = MULTIPLY(z4, FIX(0.314692123)); /* c12 */ |
---|
3179 | z4 = MULTIPLY(z4, FIX(0.881747734)); /* c8 */ |
---|
3180 | |
---|
3181 | tmp10 = z1 + z2; |
---|
3182 | tmp11 = z1 + z3; |
---|
3183 | tmp12 = z1 - z4; |
---|
3184 | |
---|
3185 | tmp23 = z1 - ((z2 + z3 - z4) << 1); /* c0 = (c4+c12-c8)*2 */ |
---|
3186 | |
---|
3187 | z1 = (INT32) wsptr[2]; |
---|
3188 | z2 = (INT32) wsptr[6]; |
---|
3189 | |
---|
3190 | z3 = MULTIPLY(z1 + z2, FIX(1.105676686)); /* c6 */ |
---|
3191 | |
---|
3192 | tmp13 = z3 + MULTIPLY(z1, FIX(0.273079590)); /* c2-c6 */ |
---|
3193 | tmp14 = z3 - MULTIPLY(z2, FIX(1.719280954)); /* c6+c10 */ |
---|
3194 | tmp15 = MULTIPLY(z1, FIX(0.613604268)) - /* c10 */ |
---|
3195 | MULTIPLY(z2, FIX(1.378756276)); /* c2 */ |
---|
3196 | |
---|
3197 | tmp20 = tmp10 + tmp13; |
---|
3198 | tmp26 = tmp10 - tmp13; |
---|
3199 | tmp21 = tmp11 + tmp14; |
---|
3200 | tmp25 = tmp11 - tmp14; |
---|
3201 | tmp22 = tmp12 + tmp15; |
---|
3202 | tmp24 = tmp12 - tmp15; |
---|
3203 | |
---|
3204 | /* Odd part */ |
---|
3205 | |
---|
3206 | z1 = (INT32) wsptr[1]; |
---|
3207 | z2 = (INT32) wsptr[3]; |
---|
3208 | z3 = (INT32) wsptr[5]; |
---|
3209 | z4 = (INT32) wsptr[7]; |
---|
3210 | z4 <<= CONST_BITS; |
---|
3211 | |
---|
3212 | tmp14 = z1 + z3; |
---|
3213 | tmp11 = MULTIPLY(z1 + z2, FIX(1.334852607)); /* c3 */ |
---|
3214 | tmp12 = MULTIPLY(tmp14, FIX(1.197448846)); /* c5 */ |
---|
3215 | tmp10 = tmp11 + tmp12 + z4 - MULTIPLY(z1, FIX(1.126980169)); /* c3+c5-c1 */ |
---|
3216 | tmp14 = MULTIPLY(tmp14, FIX(0.752406978)); /* c9 */ |
---|
3217 | tmp16 = tmp14 - MULTIPLY(z1, FIX(1.061150426)); /* c9+c11-c13 */ |
---|
3218 | z1 -= z2; |
---|
3219 | tmp15 = MULTIPLY(z1, FIX(0.467085129)) - z4; /* c11 */ |
---|
3220 | tmp16 += tmp15; |
---|
3221 | tmp13 = MULTIPLY(z2 + z3, - FIX(0.158341681)) - z4; /* -c13 */ |
---|
3222 | tmp11 += tmp13 - MULTIPLY(z2, FIX(0.424103948)); /* c3-c9-c13 */ |
---|
3223 | tmp12 += tmp13 - MULTIPLY(z3, FIX(2.373959773)); /* c3+c5-c13 */ |
---|
3224 | tmp13 = MULTIPLY(z3 - z2, FIX(1.405321284)); /* c1 */ |
---|
3225 | tmp14 += tmp13 + z4 - MULTIPLY(z3, FIX(1.6906431334)); /* c1+c9-c11 */ |
---|
3226 | tmp15 += tmp13 + MULTIPLY(z2, FIX(0.674957567)); /* c1+c11-c5 */ |
---|
3227 | |
---|
3228 | tmp13 = ((z1 - z3) << CONST_BITS) + z4; |
---|
3229 | |
---|
3230 | /* Final output stage */ |
---|
3231 | |
---|
3232 | outptr[0] = range_limit[(int) RIGHT_SHIFT(tmp20 + tmp10, |
---|
3233 | CONST_BITS+PASS1_BITS+3) |
---|
3234 | & RANGE_MASK]; |
---|
3235 | outptr[13] = range_limit[(int) RIGHT_SHIFT(tmp20 - tmp10, |
---|
3236 | CONST_BITS+PASS1_BITS+3) |
---|
3237 | & RANGE_MASK]; |
---|
3238 | outptr[1] = range_limit[(int) RIGHT_SHIFT(tmp21 + tmp11, |
---|
3239 | CONST_BITS+PASS1_BITS+3) |
---|
3240 | & RANGE_MASK]; |
---|
3241 | outptr[12] = range_limit[(int) RIGHT_SHIFT(tmp21 - tmp11, |
---|
3242 | CONST_BITS+PASS1_BITS+3) |
---|
3243 | & RANGE_MASK]; |
---|
3244 | outptr[2] = range_limit[(int) RIGHT_SHIFT(tmp22 + tmp12, |
---|
3245 | CONST_BITS+PASS1_BITS+3) |
---|
3246 | & RANGE_MASK]; |
---|
3247 | outptr[11] = range_limit[(int) RIGHT_SHIFT(tmp22 - tmp12, |
---|
3248 | CONST_BITS+PASS1_BITS+3) |
---|
3249 | & RANGE_MASK]; |
---|
3250 | outptr[3] = range_limit[(int) RIGHT_SHIFT(tmp23 + tmp13, |
---|
3251 | CONST_BITS+PASS1_BITS+3) |
---|
3252 | & RANGE_MASK]; |
---|
3253 | outptr[10] = range_limit[(int) RIGHT_SHIFT(tmp23 - tmp13, |
---|
3254 | CONST_BITS+PASS1_BITS+3) |
---|
3255 | & RANGE_MASK]; |
---|
3256 | outptr[4] = range_limit[(int) RIGHT_SHIFT(tmp24 + tmp14, |
---|
3257 | CONST_BITS+PASS1_BITS+3) |
---|
3258 | & RANGE_MASK]; |
---|
3259 | outptr[9] = range_limit[(int) RIGHT_SHIFT(tmp24 - tmp14, |
---|
3260 | CONST_BITS+PASS1_BITS+3) |
---|
3261 | & RANGE_MASK]; |
---|
3262 | outptr[5] = range_limit[(int) RIGHT_SHIFT(tmp25 + tmp15, |
---|
3263 | CONST_BITS+PASS1_BITS+3) |
---|
3264 | & RANGE_MASK]; |
---|
3265 | outptr[8] = range_limit[(int) RIGHT_SHIFT(tmp25 - tmp15, |
---|
3266 | CONST_BITS+PASS1_BITS+3) |
---|
3267 | & RANGE_MASK]; |
---|
3268 | outptr[6] = range_limit[(int) RIGHT_SHIFT(tmp26 + tmp16, |
---|
3269 | CONST_BITS+PASS1_BITS+3) |
---|
3270 | & RANGE_MASK]; |
---|
3271 | outptr[7] = range_limit[(int) RIGHT_SHIFT(tmp26 - tmp16, |
---|
3272 | CONST_BITS+PASS1_BITS+3) |
---|
3273 | & RANGE_MASK]; |
---|
3274 | |
---|
3275 | wsptr += 8; /* advance pointer to next row */ |
---|
3276 | } |
---|
3277 | } |
---|
3278 | |
---|
3279 | |
---|
3280 | /* |
---|
3281 | * Perform dequantization and inverse DCT on one block of coefficients, |
---|
3282 | * producing a 12x6 output block. |
---|
3283 | * |
---|
3284 | * 6-point IDCT in pass 1 (columns), 12-point in pass 2 (rows). |
---|
3285 | */ |
---|
3286 | |
---|
3287 | GLOBAL(void) |
---|
3288 | jpeg_idct_12x6 (j_decompress_ptr cinfo, jpeg_component_info * compptr, |
---|
3289 | JCOEFPTR coef_block, |
---|
3290 | JSAMPARRAY output_buf, JDIMENSION output_col) |
---|
3291 | { |
---|
3292 | INT32 tmp10, tmp11, tmp12, tmp13, tmp14, tmp15; |
---|
3293 | INT32 tmp20, tmp21, tmp22, tmp23, tmp24, tmp25; |
---|
3294 | INT32 z1, z2, z3, z4; |
---|
3295 | JCOEFPTR inptr; |
---|
3296 | ISLOW_MULT_TYPE * quantptr; |
---|
3297 | int * wsptr; |
---|
3298 | JSAMPROW outptr; |
---|
3299 | JSAMPLE *range_limit = IDCT_range_limit(cinfo); |
---|
3300 | int ctr; |
---|
3301 | int workspace[8*6]; /* buffers data between passes */ |
---|
3302 | SHIFT_TEMPS |
---|
3303 | |
---|
3304 | /* Pass 1: process columns from input, store into work array. |
---|
3305 | * 6-point IDCT kernel, cK represents sqrt(2) * cos(K*pi/12). |
---|
3306 | */ |
---|
3307 | inptr = coef_block; |
---|
3308 | quantptr = (ISLOW_MULT_TYPE *) compptr->dct_table; |
---|
3309 | wsptr = workspace; |
---|
3310 | for (ctr = 0; ctr < 8; ctr++, inptr++, quantptr++, wsptr++) { |
---|
3311 | /* Even part */ |
---|
3312 | |
---|
3313 | tmp10 = DEQUANTIZE(inptr[DCTSIZE*0], quantptr[DCTSIZE*0]); |
---|
3314 | tmp10 <<= CONST_BITS; |
---|
3315 | /* Add fudge factor here for final descale. */ |
---|
3316 | tmp10 += ONE << (CONST_BITS-PASS1_BITS-1); |
---|
3317 | tmp12 = DEQUANTIZE(inptr[DCTSIZE*4], quantptr[DCTSIZE*4]); |
---|
3318 | tmp20 = MULTIPLY(tmp12, FIX(0.707106781)); /* c4 */ |
---|
3319 | tmp11 = tmp10 + tmp20; |
---|
3320 | tmp21 = RIGHT_SHIFT(tmp10 - tmp20 - tmp20, CONST_BITS-PASS1_BITS); |
---|
3321 | tmp20 = DEQUANTIZE(inptr[DCTSIZE*2], quantptr[DCTSIZE*2]); |
---|
3322 | tmp10 = MULTIPLY(tmp20, FIX(1.224744871)); /* c2 */ |
---|
3323 | tmp20 = tmp11 + tmp10; |
---|
3324 | tmp22 = tmp11 - tmp10; |
---|
3325 | |
---|
3326 | /* Odd part */ |
---|
3327 | |
---|
3328 | z1 = DEQUANTIZE(inptr[DCTSIZE*1], quantptr[DCTSIZE*1]); |
---|
3329 | z2 = DEQUANTIZE(inptr[DCTSIZE*3], quantptr[DCTSIZE*3]); |
---|
3330 | z3 = DEQUANTIZE(inptr[DCTSIZE*5], quantptr[DCTSIZE*5]); |
---|
3331 | tmp11 = MULTIPLY(z1 + z3, FIX(0.366025404)); /* c5 */ |
---|
3332 | tmp10 = tmp11 + ((z1 + z2) << CONST_BITS); |
---|
3333 | tmp12 = tmp11 + ((z3 - z2) << CONST_BITS); |
---|
3334 | tmp11 = (z1 - z2 - z3) << PASS1_BITS; |
---|
3335 | |
---|
3336 | /* Final output stage */ |
---|
3337 | |
---|
3338 | wsptr[8*0] = (int) RIGHT_SHIFT(tmp20 + tmp10, CONST_BITS-PASS1_BITS); |
---|
3339 | wsptr[8*5] = (int) RIGHT_SHIFT(tmp20 - tmp10, CONST_BITS-PASS1_BITS); |
---|
3340 | wsptr[8*1] = (int) (tmp21 + tmp11); |
---|
3341 | wsptr[8*4] = (int) (tmp21 - tmp11); |
---|
3342 | wsptr[8*2] = (int) RIGHT_SHIFT(tmp22 + tmp12, CONST_BITS-PASS1_BITS); |
---|
3343 | wsptr[8*3] = (int) RIGHT_SHIFT(tmp22 - tmp12, CONST_BITS-PASS1_BITS); |
---|
3344 | } |
---|
3345 | |
---|
3346 | /* Pass 2: process 6 rows from work array, store into output array. |
---|
3347 | * 12-point IDCT kernel, cK represents sqrt(2) * cos(K*pi/24). |
---|
3348 | */ |
---|
3349 | wsptr = workspace; |
---|
3350 | for (ctr = 0; ctr < 6; ctr++) { |
---|
3351 | outptr = output_buf[ctr] + output_col; |
---|
3352 | |
---|
3353 | /* Even part */ |
---|
3354 | |
---|
3355 | /* Add fudge factor here for final descale. */ |
---|
3356 | z3 = (INT32) wsptr[0] + (ONE << (PASS1_BITS+2)); |
---|
3357 | z3 <<= CONST_BITS; |
---|
3358 | |
---|
3359 | z4 = (INT32) wsptr[4]; |
---|
3360 | z4 = MULTIPLY(z4, FIX(1.224744871)); /* c4 */ |
---|
3361 | |
---|
3362 | tmp10 = z3 + z4; |
---|
3363 | tmp11 = z3 - z4; |
---|
3364 | |
---|
3365 | z1 = (INT32) wsptr[2]; |
---|
3366 | z4 = MULTIPLY(z1, FIX(1.366025404)); /* c2 */ |
---|
3367 | z1 <<= CONST_BITS; |
---|
3368 | z2 = (INT32) wsptr[6]; |
---|
3369 | z2 <<= CONST_BITS; |
---|
3370 | |
---|
3371 | tmp12 = z1 - z2; |
---|
3372 | |
---|
3373 | tmp21 = z3 + tmp12; |
---|
3374 | tmp24 = z3 - tmp12; |
---|
3375 | |
---|
3376 | tmp12 = z4 + z2; |
---|
3377 | |
---|
3378 | tmp20 = tmp10 + tmp12; |
---|
3379 | tmp25 = tmp10 - tmp12; |
---|
3380 | |
---|
3381 | tmp12 = z4 - z1 - z2; |
---|
3382 | |
---|
3383 | tmp22 = tmp11 + tmp12; |
---|
3384 | tmp23 = tmp11 - tmp12; |
---|
3385 | |
---|
3386 | /* Odd part */ |
---|
3387 | |
---|
3388 | z1 = (INT32) wsptr[1]; |
---|
3389 | z2 = (INT32) wsptr[3]; |
---|
3390 | z3 = (INT32) wsptr[5]; |
---|
3391 | z4 = (INT32) wsptr[7]; |
---|
3392 | |
---|
3393 | tmp11 = MULTIPLY(z2, FIX(1.306562965)); /* c3 */ |
---|
3394 | tmp14 = MULTIPLY(z2, - FIX_0_541196100); /* -c9 */ |
---|
3395 | |
---|
3396 | tmp10 = z1 + z3; |
---|
3397 | tmp15 = MULTIPLY(tmp10 + z4, FIX(0.860918669)); /* c7 */ |
---|
3398 | tmp12 = tmp15 + MULTIPLY(tmp10, FIX(0.261052384)); /* c5-c7 */ |
---|
3399 | tmp10 = tmp12 + tmp11 + MULTIPLY(z1, FIX(0.280143716)); /* c1-c5 */ |
---|
3400 | tmp13 = MULTIPLY(z3 + z4, - FIX(1.045510580)); /* -(c7+c11) */ |
---|
3401 | tmp12 += tmp13 + tmp14 - MULTIPLY(z3, FIX(1.478575242)); /* c1+c5-c7-c11 */ |
---|
3402 | tmp13 += tmp15 - tmp11 + MULTIPLY(z4, FIX(1.586706681)); /* c1+c11 */ |
---|
3403 | tmp15 += tmp14 - MULTIPLY(z1, FIX(0.676326758)) - /* c7-c11 */ |
---|
3404 | MULTIPLY(z4, FIX(1.982889723)); /* c5+c7 */ |
---|
3405 | |
---|
3406 | z1 -= z4; |
---|
3407 | z2 -= z3; |
---|
3408 | z3 = MULTIPLY(z1 + z2, FIX_0_541196100); /* c9 */ |
---|
3409 | tmp11 = z3 + MULTIPLY(z1, FIX_0_765366865); /* c3-c9 */ |
---|
3410 | tmp14 = z3 - MULTIPLY(z2, FIX_1_847759065); /* c3+c9 */ |
---|
3411 | |
---|
3412 | /* Final output stage */ |
---|
3413 | |
---|
3414 | outptr[0] = range_limit[(int) RIGHT_SHIFT(tmp20 + tmp10, |
---|
3415 | CONST_BITS+PASS1_BITS+3) |
---|
3416 | & RANGE_MASK]; |
---|
3417 | outptr[11] = range_limit[(int) RIGHT_SHIFT(tmp20 - tmp10, |
---|
3418 | CONST_BITS+PASS1_BITS+3) |
---|
3419 | & RANGE_MASK]; |
---|
3420 | outptr[1] = range_limit[(int) RIGHT_SHIFT(tmp21 + tmp11, |
---|
3421 | CONST_BITS+PASS1_BITS+3) |
---|
3422 | & RANGE_MASK]; |
---|
3423 | outptr[10] = range_limit[(int) RIGHT_SHIFT(tmp21 - tmp11, |
---|
3424 | CONST_BITS+PASS1_BITS+3) |
---|
3425 | & RANGE_MASK]; |
---|
3426 | outptr[2] = range_limit[(int) RIGHT_SHIFT(tmp22 + tmp12, |
---|
3427 | CONST_BITS+PASS1_BITS+3) |
---|
3428 | & RANGE_MASK]; |
---|
3429 | outptr[9] = range_limit[(int) RIGHT_SHIFT(tmp22 - tmp12, |
---|
3430 | CONST_BITS+PASS1_BITS+3) |
---|
3431 | & RANGE_MASK]; |
---|
3432 | outptr[3] = range_limit[(int) RIGHT_SHIFT(tmp23 + tmp13, |
---|
3433 | CONST_BITS+PASS1_BITS+3) |
---|
3434 | & RANGE_MASK]; |
---|
3435 | outptr[8] = range_limit[(int) RIGHT_SHIFT(tmp23 - tmp13, |
---|
3436 | CONST_BITS+PASS1_BITS+3) |
---|
3437 | & RANGE_MASK]; |
---|
3438 | outptr[4] = range_limit[(int) RIGHT_SHIFT(tmp24 + tmp14, |
---|
3439 | CONST_BITS+PASS1_BITS+3) |
---|
3440 | & RANGE_MASK]; |
---|
3441 | outptr[7] = range_limit[(int) RIGHT_SHIFT(tmp24 - tmp14, |
---|
3442 | CONST_BITS+PASS1_BITS+3) |
---|
3443 | & RANGE_MASK]; |
---|
3444 | outptr[5] = range_limit[(int) RIGHT_SHIFT(tmp25 + tmp15, |
---|
3445 | CONST_BITS+PASS1_BITS+3) |
---|
3446 | & RANGE_MASK]; |
---|
3447 | outptr[6] = range_limit[(int) RIGHT_SHIFT(tmp25 - tmp15, |
---|
3448 | CONST_BITS+PASS1_BITS+3) |
---|
3449 | & RANGE_MASK]; |
---|
3450 | |
---|
3451 | wsptr += 8; /* advance pointer to next row */ |
---|
3452 | } |
---|
3453 | } |
---|
3454 | |
---|
3455 | |
---|
3456 | /* |
---|
3457 | * Perform dequantization and inverse DCT on one block of coefficients, |
---|
3458 | * producing a 10x5 output block. |
---|
3459 | * |
---|
3460 | * 5-point IDCT in pass 1 (columns), 10-point in pass 2 (rows). |
---|
3461 | */ |
---|
3462 | |
---|
3463 | GLOBAL(void) |
---|
3464 | jpeg_idct_10x5 (j_decompress_ptr cinfo, jpeg_component_info * compptr, |
---|
3465 | JCOEFPTR coef_block, |
---|
3466 | JSAMPARRAY output_buf, JDIMENSION output_col) |
---|
3467 | { |
---|
3468 | INT32 tmp10, tmp11, tmp12, tmp13, tmp14; |
---|
3469 | INT32 tmp20, tmp21, tmp22, tmp23, tmp24; |
---|
3470 | INT32 z1, z2, z3, z4; |
---|
3471 | JCOEFPTR inptr; |
---|
3472 | ISLOW_MULT_TYPE * quantptr; |
---|
3473 | int * wsptr; |
---|
3474 | JSAMPROW outptr; |
---|
3475 | JSAMPLE *range_limit = IDCT_range_limit(cinfo); |
---|
3476 | int ctr; |
---|
3477 | int workspace[8*5]; /* buffers data between passes */ |
---|
3478 | SHIFT_TEMPS |
---|
3479 | |
---|
3480 | /* Pass 1: process columns from input, store into work array. |
---|
3481 | * 5-point IDCT kernel, cK represents sqrt(2) * cos(K*pi/10). |
---|
3482 | */ |
---|
3483 | inptr = coef_block; |
---|
3484 | quantptr = (ISLOW_MULT_TYPE *) compptr->dct_table; |
---|
3485 | wsptr = workspace; |
---|
3486 | for (ctr = 0; ctr < 8; ctr++, inptr++, quantptr++, wsptr++) { |
---|
3487 | /* Even part */ |
---|
3488 | |
---|
3489 | tmp12 = DEQUANTIZE(inptr[DCTSIZE*0], quantptr[DCTSIZE*0]); |
---|
3490 | tmp12 <<= CONST_BITS; |
---|
3491 | /* Add fudge factor here for final descale. */ |
---|
3492 | tmp12 += ONE << (CONST_BITS-PASS1_BITS-1); |
---|
3493 | tmp13 = DEQUANTIZE(inptr[DCTSIZE*2], quantptr[DCTSIZE*2]); |
---|
3494 | tmp14 = DEQUANTIZE(inptr[DCTSIZE*4], quantptr[DCTSIZE*4]); |
---|
3495 | z1 = MULTIPLY(tmp13 + tmp14, FIX(0.790569415)); /* (c2+c4)/2 */ |
---|
3496 | z2 = MULTIPLY(tmp13 - tmp14, FIX(0.353553391)); /* (c2-c4)/2 */ |
---|
3497 | z3 = tmp12 + z2; |
---|
3498 | tmp10 = z3 + z1; |
---|
3499 | tmp11 = z3 - z1; |
---|
3500 | tmp12 -= z2 << 2; |
---|
3501 | |
---|
3502 | /* Odd part */ |
---|
3503 | |
---|
3504 | z2 = DEQUANTIZE(inptr[DCTSIZE*1], quantptr[DCTSIZE*1]); |
---|
3505 | z3 = DEQUANTIZE(inptr[DCTSIZE*3], quantptr[DCTSIZE*3]); |
---|
3506 | |
---|
3507 | z1 = MULTIPLY(z2 + z3, FIX(0.831253876)); /* c3 */ |
---|
3508 | tmp13 = z1 + MULTIPLY(z2, FIX(0.513743148)); /* c1-c3 */ |
---|
3509 | tmp14 = z1 - MULTIPLY(z3, FIX(2.176250899)); /* c1+c3 */ |
---|
3510 | |
---|
3511 | /* Final output stage */ |
---|
3512 | |
---|
3513 | wsptr[8*0] = (int) RIGHT_SHIFT(tmp10 + tmp13, CONST_BITS-PASS1_BITS); |
---|
3514 | wsptr[8*4] = (int) RIGHT_SHIFT(tmp10 - tmp13, CONST_BITS-PASS1_BITS); |
---|
3515 | wsptr[8*1] = (int) RIGHT_SHIFT(tmp11 + tmp14, CONST_BITS-PASS1_BITS); |
---|
3516 | wsptr[8*3] = (int) RIGHT_SHIFT(tmp11 - tmp14, CONST_BITS-PASS1_BITS); |
---|
3517 | wsptr[8*2] = (int) RIGHT_SHIFT(tmp12, CONST_BITS-PASS1_BITS); |
---|
3518 | } |
---|
3519 | |
---|
3520 | /* Pass 2: process 5 rows from work array, store into output array. |
---|
3521 | * 10-point IDCT kernel, cK represents sqrt(2) * cos(K*pi/20). |
---|
3522 | */ |
---|
3523 | wsptr = workspace; |
---|
3524 | for (ctr = 0; ctr < 5; ctr++) { |
---|
3525 | outptr = output_buf[ctr] + output_col; |
---|
3526 | |
---|
3527 | /* Even part */ |
---|
3528 | |
---|
3529 | /* Add fudge factor here for final descale. */ |
---|
3530 | z3 = (INT32) wsptr[0] + (ONE << (PASS1_BITS+2)); |
---|
3531 | z3 <<= CONST_BITS; |
---|
3532 | z4 = (INT32) wsptr[4]; |
---|
3533 | z1 = MULTIPLY(z4, FIX(1.144122806)); /* c4 */ |
---|
3534 | z2 = MULTIPLY(z4, FIX(0.437016024)); /* c8 */ |
---|
3535 | tmp10 = z3 + z1; |
---|
3536 | tmp11 = z3 - z2; |
---|
3537 | |
---|
3538 | tmp22 = z3 - ((z1 - z2) << 1); /* c0 = (c4-c8)*2 */ |
---|
3539 | |
---|
3540 | z2 = (INT32) wsptr[2]; |
---|
3541 | z3 = (INT32) wsptr[6]; |
---|
3542 | |
---|
3543 | z1 = MULTIPLY(z2 + z3, FIX(0.831253876)); /* c6 */ |
---|
3544 | tmp12 = z1 + MULTIPLY(z2, FIX(0.513743148)); /* c2-c6 */ |
---|
3545 | tmp13 = z1 - MULTIPLY(z3, FIX(2.176250899)); /* c2+c6 */ |
---|
3546 | |
---|
3547 | tmp20 = tmp10 + tmp12; |
---|
3548 | tmp24 = tmp10 - tmp12; |
---|
3549 | tmp21 = tmp11 + tmp13; |
---|
3550 | tmp23 = tmp11 - tmp13; |
---|
3551 | |
---|
3552 | /* Odd part */ |
---|
3553 | |
---|
3554 | z1 = (INT32) wsptr[1]; |
---|
3555 | z2 = (INT32) wsptr[3]; |
---|
3556 | z3 = (INT32) wsptr[5]; |
---|
3557 | z3 <<= CONST_BITS; |
---|
3558 | z4 = (INT32) wsptr[7]; |
---|
3559 | |
---|
3560 | tmp11 = z2 + z4; |
---|
3561 | tmp13 = z2 - z4; |
---|
3562 | |
---|
3563 | tmp12 = MULTIPLY(tmp13, FIX(0.309016994)); /* (c3-c7)/2 */ |
---|
3564 | |
---|
3565 | z2 = MULTIPLY(tmp11, FIX(0.951056516)); /* (c3+c7)/2 */ |
---|
3566 | z4 = z3 + tmp12; |
---|
3567 | |
---|
3568 | tmp10 = MULTIPLY(z1, FIX(1.396802247)) + z2 + z4; /* c1 */ |
---|
3569 | tmp14 = MULTIPLY(z1, FIX(0.221231742)) - z2 + z4; /* c9 */ |
---|
3570 | |
---|
3571 | z2 = MULTIPLY(tmp11, FIX(0.587785252)); /* (c1-c9)/2 */ |
---|
3572 | z4 = z3 - tmp12 - (tmp13 << (CONST_BITS - 1)); |
---|
3573 | |
---|
3574 | tmp12 = ((z1 - tmp13) << CONST_BITS) - z3; |
---|
3575 | |
---|
3576 | tmp11 = MULTIPLY(z1, FIX(1.260073511)) - z2 - z4; /* c3 */ |
---|
3577 | tmp13 = MULTIPLY(z1, FIX(0.642039522)) - z2 + z4; /* c7 */ |
---|
3578 | |
---|
3579 | /* Final output stage */ |
---|
3580 | |
---|
3581 | outptr[0] = range_limit[(int) RIGHT_SHIFT(tmp20 + tmp10, |
---|
3582 | CONST_BITS+PASS1_BITS+3) |
---|
3583 | & RANGE_MASK]; |
---|
3584 | outptr[9] = range_limit[(int) RIGHT_SHIFT(tmp20 - tmp10, |
---|
3585 | CONST_BITS+PASS1_BITS+3) |
---|
3586 | & RANGE_MASK]; |
---|
3587 | outptr[1] = range_limit[(int) RIGHT_SHIFT(tmp21 + tmp11, |
---|
3588 | CONST_BITS+PASS1_BITS+3) |
---|
3589 | & RANGE_MASK]; |
---|
3590 | outptr[8] = range_limit[(int) RIGHT_SHIFT(tmp21 - tmp11, |
---|
3591 | CONST_BITS+PASS1_BITS+3) |
---|
3592 | & RANGE_MASK]; |
---|
3593 | outptr[2] = range_limit[(int) RIGHT_SHIFT(tmp22 + tmp12, |
---|
3594 | CONST_BITS+PASS1_BITS+3) |
---|
3595 | & RANGE_MASK]; |
---|
3596 | outptr[7] = range_limit[(int) RIGHT_SHIFT(tmp22 - tmp12, |
---|
3597 | CONST_BITS+PASS1_BITS+3) |
---|
3598 | & RANGE_MASK]; |
---|
3599 | outptr[3] = range_limit[(int) RIGHT_SHIFT(tmp23 + tmp13, |
---|
3600 | CONST_BITS+PASS1_BITS+3) |
---|
3601 | & RANGE_MASK]; |
---|
3602 | outptr[6] = range_limit[(int) RIGHT_SHIFT(tmp23 - tmp13, |
---|
3603 | CONST_BITS+PASS1_BITS+3) |
---|
3604 | & RANGE_MASK]; |
---|
3605 | outptr[4] = range_limit[(int) RIGHT_SHIFT(tmp24 + tmp14, |
---|
3606 | CONST_BITS+PASS1_BITS+3) |
---|
3607 | & RANGE_MASK]; |
---|
3608 | outptr[5] = range_limit[(int) RIGHT_SHIFT(tmp24 - tmp14, |
---|
3609 | CONST_BITS+PASS1_BITS+3) |
---|
3610 | & RANGE_MASK]; |
---|
3611 | |
---|
3612 | wsptr += 8; /* advance pointer to next row */ |
---|
3613 | } |
---|
3614 | } |
---|
3615 | |
---|
3616 | |
---|
3617 | /* |
---|
3618 | * Perform dequantization and inverse DCT on one block of coefficients, |
---|
3619 | * producing a 8x4 output block. |
---|
3620 | * |
---|
3621 | * 4-point IDCT in pass 1 (columns), 8-point in pass 2 (rows). |
---|
3622 | */ |
---|
3623 | |
---|
3624 | GLOBAL(void) |
---|
3625 | jpeg_idct_8x4 (j_decompress_ptr cinfo, jpeg_component_info * compptr, |
---|
3626 | JCOEFPTR coef_block, |
---|
3627 | JSAMPARRAY output_buf, JDIMENSION output_col) |
---|
3628 | { |
---|
3629 | INT32 tmp0, tmp1, tmp2, tmp3; |
---|
3630 | INT32 tmp10, tmp11, tmp12, tmp13; |
---|
3631 | INT32 z1, z2, z3; |
---|
3632 | JCOEFPTR inptr; |
---|
3633 | ISLOW_MULT_TYPE * quantptr; |
---|
3634 | int * wsptr; |
---|
3635 | JSAMPROW outptr; |
---|
3636 | JSAMPLE *range_limit = IDCT_range_limit(cinfo); |
---|
3637 | int ctr; |
---|
3638 | int workspace[8*4]; /* buffers data between passes */ |
---|
3639 | SHIFT_TEMPS |
---|
3640 | |
---|
3641 | /* Pass 1: process columns from input, store into work array. |
---|
3642 | * 4-point IDCT kernel, cK represents sqrt(2) * cos(K*pi/16). |
---|
3643 | */ |
---|
3644 | inptr = coef_block; |
---|
3645 | quantptr = (ISLOW_MULT_TYPE *) compptr->dct_table; |
---|
3646 | wsptr = workspace; |
---|
3647 | for (ctr = 0; ctr < 8; ctr++, inptr++, quantptr++, wsptr++) { |
---|
3648 | /* Even part */ |
---|
3649 | |
---|
3650 | tmp0 = DEQUANTIZE(inptr[DCTSIZE*0], quantptr[DCTSIZE*0]); |
---|
3651 | tmp2 = DEQUANTIZE(inptr[DCTSIZE*2], quantptr[DCTSIZE*2]); |
---|
3652 | |
---|
3653 | tmp10 = (tmp0 + tmp2) << PASS1_BITS; |
---|
3654 | tmp12 = (tmp0 - tmp2) << PASS1_BITS; |
---|
3655 | |
---|
3656 | /* Odd part */ |
---|
3657 | /* Same rotation as in the even part of the 8x8 LL&M IDCT */ |
---|
3658 | |
---|
3659 | z2 = DEQUANTIZE(inptr[DCTSIZE*1], quantptr[DCTSIZE*1]); |
---|
3660 | z3 = DEQUANTIZE(inptr[DCTSIZE*3], quantptr[DCTSIZE*3]); |
---|
3661 | |
---|
3662 | z1 = MULTIPLY(z2 + z3, FIX_0_541196100); /* c6 */ |
---|
3663 | /* Add fudge factor here for final descale. */ |
---|
3664 | z1 += ONE << (CONST_BITS-PASS1_BITS-1); |
---|
3665 | tmp0 = RIGHT_SHIFT(z1 + MULTIPLY(z2, FIX_0_765366865), /* c2-c6 */ |
---|
3666 | CONST_BITS-PASS1_BITS); |
---|
3667 | tmp2 = RIGHT_SHIFT(z1 - MULTIPLY(z3, FIX_1_847759065), /* c2+c6 */ |
---|
3668 | CONST_BITS-PASS1_BITS); |
---|
3669 | |
---|
3670 | /* Final output stage */ |
---|
3671 | |
---|
3672 | wsptr[8*0] = (int) (tmp10 + tmp0); |
---|
3673 | wsptr[8*3] = (int) (tmp10 - tmp0); |
---|
3674 | wsptr[8*1] = (int) (tmp12 + tmp2); |
---|
3675 | wsptr[8*2] = (int) (tmp12 - tmp2); |
---|
3676 | } |
---|
3677 | |
---|
3678 | /* Pass 2: process rows from work array, store into output array. */ |
---|
3679 | /* Note that we must descale the results by a factor of 8 == 2**3, */ |
---|
3680 | /* and also undo the PASS1_BITS scaling. */ |
---|
3681 | |
---|
3682 | wsptr = workspace; |
---|
3683 | for (ctr = 0; ctr < 4; ctr++) { |
---|
3684 | outptr = output_buf[ctr] + output_col; |
---|
3685 | |
---|
3686 | /* Even part: reverse the even part of the forward DCT. */ |
---|
3687 | /* The rotator is sqrt(2)*c(-6). */ |
---|
3688 | |
---|
3689 | z2 = (INT32) wsptr[2]; |
---|
3690 | z3 = (INT32) wsptr[6]; |
---|
3691 | |
---|
3692 | z1 = MULTIPLY(z2 + z3, FIX_0_541196100); |
---|
3693 | tmp2 = z1 + MULTIPLY(z2, FIX_0_765366865); |
---|
3694 | tmp3 = z1 - MULTIPLY(z3, FIX_1_847759065); |
---|
3695 | |
---|
3696 | /* Add fudge factor here for final descale. */ |
---|
3697 | z2 = (INT32) wsptr[0] + (ONE << (PASS1_BITS+2)); |
---|
3698 | z3 = (INT32) wsptr[4]; |
---|
3699 | |
---|
3700 | tmp0 = (z2 + z3) << CONST_BITS; |
---|
3701 | tmp1 = (z2 - z3) << CONST_BITS; |
---|
3702 | |
---|
3703 | tmp10 = tmp0 + tmp2; |
---|
3704 | tmp13 = tmp0 - tmp2; |
---|
3705 | tmp11 = tmp1 + tmp3; |
---|
3706 | tmp12 = tmp1 - tmp3; |
---|
3707 | |
---|
3708 | /* Odd part per figure 8; the matrix is unitary and hence its |
---|
3709 | * transpose is its inverse. i0..i3 are y7,y5,y3,y1 respectively. |
---|
3710 | */ |
---|
3711 | |
---|
3712 | tmp0 = (INT32) wsptr[7]; |
---|
3713 | tmp1 = (INT32) wsptr[5]; |
---|
3714 | tmp2 = (INT32) wsptr[3]; |
---|
3715 | tmp3 = (INT32) wsptr[1]; |
---|
3716 | |
---|
3717 | z2 = tmp0 + tmp2; |
---|
3718 | z3 = tmp1 + tmp3; |
---|
3719 | |
---|
3720 | z1 = MULTIPLY(z2 + z3, FIX_1_175875602); /* sqrt(2) * c3 */ |
---|
3721 | z2 = MULTIPLY(z2, - FIX_1_961570560); /* sqrt(2) * (-c3-c5) */ |
---|
3722 | z3 = MULTIPLY(z3, - FIX_0_390180644); /* sqrt(2) * (c5-c3) */ |
---|
3723 | z2 += z1; |
---|
3724 | z3 += z1; |
---|
3725 | |
---|
3726 | z1 = MULTIPLY(tmp0 + tmp3, - FIX_0_899976223); /* sqrt(2) * (c7-c3) */ |
---|
3727 | tmp0 = MULTIPLY(tmp0, FIX_0_298631336); /* sqrt(2) * (-c1+c3+c5-c7) */ |
---|
3728 | tmp3 = MULTIPLY(tmp3, FIX_1_501321110); /* sqrt(2) * ( c1+c3-c5-c7) */ |
---|
3729 | tmp0 += z1 + z2; |
---|
3730 | tmp3 += z1 + z3; |
---|
3731 | |
---|
3732 | z1 = MULTIPLY(tmp1 + tmp2, - FIX_2_562915447); /* sqrt(2) * (-c1-c3) */ |
---|
3733 | tmp1 = MULTIPLY(tmp1, FIX_2_053119869); /* sqrt(2) * ( c1+c3-c5+c7) */ |
---|
3734 | tmp2 = MULTIPLY(tmp2, FIX_3_072711026); /* sqrt(2) * ( c1+c3+c5-c7) */ |
---|
3735 | tmp1 += z1 + z3; |
---|
3736 | tmp2 += z1 + z2; |
---|
3737 | |
---|
3738 | /* Final output stage: inputs are tmp10..tmp13, tmp0..tmp3 */ |
---|
3739 | |
---|
3740 | outptr[0] = range_limit[(int) RIGHT_SHIFT(tmp10 + tmp3, |
---|
3741 | CONST_BITS+PASS1_BITS+3) |
---|
3742 | & RANGE_MASK]; |
---|
3743 | outptr[7] = range_limit[(int) RIGHT_SHIFT(tmp10 - tmp3, |
---|
3744 | CONST_BITS+PASS1_BITS+3) |
---|
3745 | & RANGE_MASK]; |
---|
3746 | outptr[1] = range_limit[(int) RIGHT_SHIFT(tmp11 + tmp2, |
---|
3747 | CONST_BITS+PASS1_BITS+3) |
---|
3748 | & RANGE_MASK]; |
---|
3749 | outptr[6] = range_limit[(int) RIGHT_SHIFT(tmp11 - tmp2, |
---|
3750 | CONST_BITS+PASS1_BITS+3) |
---|
3751 | & RANGE_MASK]; |
---|
3752 | outptr[2] = range_limit[(int) RIGHT_SHIFT(tmp12 + tmp1, |
---|
3753 | CONST_BITS+PASS1_BITS+3) |
---|
3754 | & RANGE_MASK]; |
---|
3755 | outptr[5] = range_limit[(int) RIGHT_SHIFT(tmp12 - tmp1, |
---|
3756 | CONST_BITS+PASS1_BITS+3) |
---|
3757 | & RANGE_MASK]; |
---|
3758 | outptr[3] = range_limit[(int) RIGHT_SHIFT(tmp13 + tmp0, |
---|
3759 | CONST_BITS+PASS1_BITS+3) |
---|
3760 | & RANGE_MASK]; |
---|
3761 | outptr[4] = range_limit[(int) RIGHT_SHIFT(tmp13 - tmp0, |
---|
3762 | CONST_BITS+PASS1_BITS+3) |
---|
3763 | & RANGE_MASK]; |
---|
3764 | |
---|
3765 | wsptr += DCTSIZE; /* advance pointer to next row */ |
---|
3766 | } |
---|
3767 | } |
---|
3768 | |
---|
3769 | |
---|
3770 | /* |
---|
3771 | * Perform dequantization and inverse DCT on one block of coefficients, |
---|
3772 | * producing a reduced-size 6x3 output block. |
---|
3773 | * |
---|
3774 | * 3-point IDCT in pass 1 (columns), 6-point in pass 2 (rows). |
---|
3775 | */ |
---|
3776 | |
---|
3777 | GLOBAL(void) |
---|
3778 | jpeg_idct_6x3 (j_decompress_ptr cinfo, jpeg_component_info * compptr, |
---|
3779 | JCOEFPTR coef_block, |
---|
3780 | JSAMPARRAY output_buf, JDIMENSION output_col) |
---|
3781 | { |
---|
3782 | INT32 tmp0, tmp1, tmp2, tmp10, tmp11, tmp12; |
---|
3783 | INT32 z1, z2, z3; |
---|
3784 | JCOEFPTR inptr; |
---|
3785 | ISLOW_MULT_TYPE * quantptr; |
---|
3786 | int * wsptr; |
---|
3787 | JSAMPROW outptr; |
---|
3788 | JSAMPLE *range_limit = IDCT_range_limit(cinfo); |
---|
3789 | int ctr; |
---|
3790 | int workspace[6*3]; /* buffers data between passes */ |
---|
3791 | SHIFT_TEMPS |
---|
3792 | |
---|
3793 | /* Pass 1: process columns from input, store into work array. |
---|
3794 | * 3-point IDCT kernel, cK represents sqrt(2) * cos(K*pi/6). |
---|
3795 | */ |
---|
3796 | inptr = coef_block; |
---|
3797 | quantptr = (ISLOW_MULT_TYPE *) compptr->dct_table; |
---|
3798 | wsptr = workspace; |
---|
3799 | for (ctr = 0; ctr < 6; ctr++, inptr++, quantptr++, wsptr++) { |
---|
3800 | /* Even part */ |
---|
3801 | |
---|
3802 | tmp0 = DEQUANTIZE(inptr[DCTSIZE*0], quantptr[DCTSIZE*0]); |
---|
3803 | tmp0 <<= CONST_BITS; |
---|
3804 | /* Add fudge factor here for final descale. */ |
---|
3805 | tmp0 += ONE << (CONST_BITS-PASS1_BITS-1); |
---|
3806 | tmp2 = DEQUANTIZE(inptr[DCTSIZE*2], quantptr[DCTSIZE*2]); |
---|
3807 | tmp12 = MULTIPLY(tmp2, FIX(0.707106781)); /* c2 */ |
---|
3808 | tmp10 = tmp0 + tmp12; |
---|
3809 | tmp2 = tmp0 - tmp12 - tmp12; |
---|
3810 | |
---|
3811 | /* Odd part */ |
---|
3812 | |
---|
3813 | tmp12 = DEQUANTIZE(inptr[DCTSIZE*1], quantptr[DCTSIZE*1]); |
---|
3814 | tmp0 = MULTIPLY(tmp12, FIX(1.224744871)); /* c1 */ |
---|
3815 | |
---|
3816 | /* Final output stage */ |
---|
3817 | |
---|
3818 | wsptr[6*0] = (int) RIGHT_SHIFT(tmp10 + tmp0, CONST_BITS-PASS1_BITS); |
---|
3819 | wsptr[6*2] = (int) RIGHT_SHIFT(tmp10 - tmp0, CONST_BITS-PASS1_BITS); |
---|
3820 | wsptr[6*1] = (int) RIGHT_SHIFT(tmp2, CONST_BITS-PASS1_BITS); |
---|
3821 | } |
---|
3822 | |
---|
3823 | /* Pass 2: process 3 rows from work array, store into output array. |
---|
3824 | * 6-point IDCT kernel, cK represents sqrt(2) * cos(K*pi/12). |
---|
3825 | */ |
---|
3826 | wsptr = workspace; |
---|
3827 | for (ctr = 0; ctr < 3; ctr++) { |
---|
3828 | outptr = output_buf[ctr] + output_col; |
---|
3829 | |
---|
3830 | /* Even part */ |
---|
3831 | |
---|
3832 | /* Add fudge factor here for final descale. */ |
---|
3833 | tmp0 = (INT32) wsptr[0] + (ONE << (PASS1_BITS+2)); |
---|
3834 | tmp0 <<= CONST_BITS; |
---|
3835 | tmp2 = (INT32) wsptr[4]; |
---|
3836 | tmp10 = MULTIPLY(tmp2, FIX(0.707106781)); /* c4 */ |
---|
3837 | tmp1 = tmp0 + tmp10; |
---|
3838 | tmp11 = tmp0 - tmp10 - tmp10; |
---|
3839 | tmp10 = (INT32) wsptr[2]; |
---|
3840 | tmp0 = MULTIPLY(tmp10, FIX(1.224744871)); /* c2 */ |
---|
3841 | tmp10 = tmp1 + tmp0; |
---|
3842 | tmp12 = tmp1 - tmp0; |
---|
3843 | |
---|
3844 | /* Odd part */ |
---|
3845 | |
---|
3846 | z1 = (INT32) wsptr[1]; |
---|
3847 | z2 = (INT32) wsptr[3]; |
---|
3848 | z3 = (INT32) wsptr[5]; |
---|
3849 | tmp1 = MULTIPLY(z1 + z3, FIX(0.366025404)); /* c5 */ |
---|
3850 | tmp0 = tmp1 + ((z1 + z2) << CONST_BITS); |
---|
3851 | tmp2 = tmp1 + ((z3 - z2) << CONST_BITS); |
---|
3852 | tmp1 = (z1 - z2 - z3) << CONST_BITS; |
---|
3853 | |
---|
3854 | /* Final output stage */ |
---|
3855 | |
---|
3856 | outptr[0] = range_limit[(int) RIGHT_SHIFT(tmp10 + tmp0, |
---|
3857 | CONST_BITS+PASS1_BITS+3) |
---|
3858 | & RANGE_MASK]; |
---|
3859 | outptr[5] = range_limit[(int) RIGHT_SHIFT(tmp10 - tmp0, |
---|
3860 | CONST_BITS+PASS1_BITS+3) |
---|
3861 | & RANGE_MASK]; |
---|
3862 | outptr[1] = range_limit[(int) RIGHT_SHIFT(tmp11 + tmp1, |
---|
3863 | CONST_BITS+PASS1_BITS+3) |
---|
3864 | & RANGE_MASK]; |
---|
3865 | outptr[4] = range_limit[(int) RIGHT_SHIFT(tmp11 - tmp1, |
---|
3866 | CONST_BITS+PASS1_BITS+3) |
---|
3867 | & RANGE_MASK]; |
---|
3868 | outptr[2] = range_limit[(int) RIGHT_SHIFT(tmp12 + tmp2, |
---|
3869 | CONST_BITS+PASS1_BITS+3) |
---|
3870 | & RANGE_MASK]; |
---|
3871 | outptr[3] = range_limit[(int) RIGHT_SHIFT(tmp12 - tmp2, |
---|
3872 | CONST_BITS+PASS1_BITS+3) |
---|
3873 | & RANGE_MASK]; |
---|
3874 | |
---|
3875 | wsptr += 6; /* advance pointer to next row */ |
---|
3876 | } |
---|
3877 | } |
---|
3878 | |
---|
3879 | |
---|
3880 | /* |
---|
3881 | * Perform dequantization and inverse DCT on one block of coefficients, |
---|
3882 | * producing a 4x2 output block. |
---|
3883 | * |
---|
3884 | * 2-point IDCT in pass 1 (columns), 4-point in pass 2 (rows). |
---|
3885 | */ |
---|
3886 | |
---|
3887 | GLOBAL(void) |
---|
3888 | jpeg_idct_4x2 (j_decompress_ptr cinfo, jpeg_component_info * compptr, |
---|
3889 | JCOEFPTR coef_block, |
---|
3890 | JSAMPARRAY output_buf, JDIMENSION output_col) |
---|
3891 | { |
---|
3892 | INT32 tmp0, tmp2, tmp10, tmp12; |
---|
3893 | INT32 z1, z2, z3; |
---|
3894 | JCOEFPTR inptr; |
---|
3895 | ISLOW_MULT_TYPE * quantptr; |
---|
3896 | INT32 * wsptr; |
---|
3897 | JSAMPROW outptr; |
---|
3898 | JSAMPLE *range_limit = IDCT_range_limit(cinfo); |
---|
3899 | int ctr; |
---|
3900 | INT32 workspace[4*2]; /* buffers data between passes */ |
---|
3901 | SHIFT_TEMPS |
---|
3902 | |
---|
3903 | /* Pass 1: process columns from input, store into work array. */ |
---|
3904 | |
---|
3905 | inptr = coef_block; |
---|
3906 | quantptr = (ISLOW_MULT_TYPE *) compptr->dct_table; |
---|
3907 | wsptr = workspace; |
---|
3908 | for (ctr = 0; ctr < 4; ctr++, inptr++, quantptr++, wsptr++) { |
---|
3909 | /* Even part */ |
---|
3910 | |
---|
3911 | tmp10 = DEQUANTIZE(inptr[DCTSIZE*0], quantptr[DCTSIZE*0]); |
---|
3912 | |
---|
3913 | /* Odd part */ |
---|
3914 | |
---|
3915 | tmp0 = DEQUANTIZE(inptr[DCTSIZE*1], quantptr[DCTSIZE*1]); |
---|
3916 | |
---|
3917 | /* Final output stage */ |
---|
3918 | |
---|
3919 | wsptr[4*0] = tmp10 + tmp0; |
---|
3920 | wsptr[4*1] = tmp10 - tmp0; |
---|
3921 | } |
---|
3922 | |
---|
3923 | /* Pass 2: process 2 rows from work array, store into output array. |
---|
3924 | * 4-point IDCT kernel, |
---|
3925 | * cK represents sqrt(2) * cos(K*pi/16) [refers to 8-point IDCT]. |
---|
3926 | */ |
---|
3927 | wsptr = workspace; |
---|
3928 | for (ctr = 0; ctr < 2; ctr++) { |
---|
3929 | outptr = output_buf[ctr] + output_col; |
---|
3930 | |
---|
3931 | /* Even part */ |
---|
3932 | |
---|
3933 | /* Add fudge factor here for final descale. */ |
---|
3934 | tmp0 = wsptr[0] + (ONE << 2); |
---|
3935 | tmp2 = wsptr[2]; |
---|
3936 | |
---|
3937 | tmp10 = (tmp0 + tmp2) << CONST_BITS; |
---|
3938 | tmp12 = (tmp0 - tmp2) << CONST_BITS; |
---|
3939 | |
---|
3940 | /* Odd part */ |
---|
3941 | /* Same rotation as in the even part of the 8x8 LL&M IDCT */ |
---|
3942 | |
---|
3943 | z2 = wsptr[1]; |
---|
3944 | z3 = wsptr[3]; |
---|
3945 | |
---|
3946 | z1 = MULTIPLY(z2 + z3, FIX_0_541196100); /* c6 */ |
---|
3947 | tmp0 = z1 + MULTIPLY(z2, FIX_0_765366865); /* c2-c6 */ |
---|
3948 | tmp2 = z1 - MULTIPLY(z3, FIX_1_847759065); /* c2+c6 */ |
---|
3949 | |
---|
3950 | /* Final output stage */ |
---|
3951 | |
---|
3952 | outptr[0] = range_limit[(int) RIGHT_SHIFT(tmp10 + tmp0, |
---|
3953 | CONST_BITS+3) |
---|
3954 | & RANGE_MASK]; |
---|
3955 | outptr[3] = range_limit[(int) RIGHT_SHIFT(tmp10 - tmp0, |
---|
3956 | CONST_BITS+3) |
---|
3957 | & RANGE_MASK]; |
---|
3958 | outptr[1] = range_limit[(int) RIGHT_SHIFT(tmp12 + tmp2, |
---|
3959 | CONST_BITS+3) |
---|
3960 | & RANGE_MASK]; |
---|
3961 | outptr[2] = range_limit[(int) RIGHT_SHIFT(tmp12 - tmp2, |
---|
3962 | CONST_BITS+3) |
---|
3963 | & RANGE_MASK]; |
---|
3964 | |
---|
3965 | wsptr += 4; /* advance pointer to next row */ |
---|
3966 | } |
---|
3967 | } |
---|
3968 | |
---|
3969 | |
---|
3970 | /* |
---|
3971 | * Perform dequantization and inverse DCT on one block of coefficients, |
---|
3972 | * producing a 2x1 output block. |
---|
3973 | * |
---|
3974 | * 1-point IDCT in pass 1 (columns), 2-point in pass 2 (rows). |
---|
3975 | */ |
---|
3976 | |
---|
3977 | GLOBAL(void) |
---|
3978 | jpeg_idct_2x1 (j_decompress_ptr cinfo, jpeg_component_info * compptr, |
---|
3979 | JCOEFPTR coef_block, |
---|
3980 | JSAMPARRAY output_buf, JDIMENSION output_col) |
---|
3981 | { |
---|
3982 | INT32 tmp0, tmp10; |
---|
3983 | ISLOW_MULT_TYPE * quantptr; |
---|
3984 | JSAMPROW outptr; |
---|
3985 | JSAMPLE *range_limit = IDCT_range_limit(cinfo); |
---|
3986 | SHIFT_TEMPS |
---|
3987 | |
---|
3988 | /* Pass 1: empty. */ |
---|
3989 | |
---|
3990 | /* Pass 2: process 1 row from input, store into output array. */ |
---|
3991 | |
---|
3992 | quantptr = (ISLOW_MULT_TYPE *) compptr->dct_table; |
---|
3993 | outptr = output_buf[0] + output_col; |
---|
3994 | |
---|
3995 | /* Even part */ |
---|
3996 | |
---|
3997 | tmp10 = DEQUANTIZE(coef_block[0], quantptr[0]); |
---|
3998 | /* Add fudge factor here for final descale. */ |
---|
3999 | tmp10 += ONE << 2; |
---|
4000 | |
---|
4001 | /* Odd part */ |
---|
4002 | |
---|
4003 | tmp0 = DEQUANTIZE(coef_block[1], quantptr[1]); |
---|
4004 | |
---|
4005 | /* Final output stage */ |
---|
4006 | |
---|
4007 | outptr[0] = range_limit[(int) RIGHT_SHIFT(tmp10 + tmp0, 3) & RANGE_MASK]; |
---|
4008 | outptr[1] = range_limit[(int) RIGHT_SHIFT(tmp10 - tmp0, 3) & RANGE_MASK]; |
---|
4009 | } |
---|
4010 | |
---|
4011 | |
---|
4012 | /* |
---|
4013 | * Perform dequantization and inverse DCT on one block of coefficients, |
---|
4014 | * producing a 8x16 output block. |
---|
4015 | * |
---|
4016 | * 16-point IDCT in pass 1 (columns), 8-point in pass 2 (rows). |
---|
4017 | */ |
---|
4018 | |
---|
4019 | GLOBAL(void) |
---|
4020 | jpeg_idct_8x16 (j_decompress_ptr cinfo, jpeg_component_info * compptr, |
---|
4021 | JCOEFPTR coef_block, |
---|
4022 | JSAMPARRAY output_buf, JDIMENSION output_col) |
---|
4023 | { |
---|
4024 | INT32 tmp0, tmp1, tmp2, tmp3, tmp10, tmp11, tmp12, tmp13; |
---|
4025 | INT32 tmp20, tmp21, tmp22, tmp23, tmp24, tmp25, tmp26, tmp27; |
---|
4026 | INT32 z1, z2, z3, z4; |
---|
4027 | JCOEFPTR inptr; |
---|
4028 | ISLOW_MULT_TYPE * quantptr; |
---|
4029 | int * wsptr; |
---|
4030 | JSAMPROW outptr; |
---|
4031 | JSAMPLE *range_limit = IDCT_range_limit(cinfo); |
---|
4032 | int ctr; |
---|
4033 | int workspace[8*16]; /* buffers data between passes */ |
---|
4034 | SHIFT_TEMPS |
---|
4035 | |
---|
4036 | /* Pass 1: process columns from input, store into work array. |
---|
4037 | * 16-point IDCT kernel, cK represents sqrt(2) * cos(K*pi/32). |
---|
4038 | */ |
---|
4039 | inptr = coef_block; |
---|
4040 | quantptr = (ISLOW_MULT_TYPE *) compptr->dct_table; |
---|
4041 | wsptr = workspace; |
---|
4042 | for (ctr = 0; ctr < 8; ctr++, inptr++, quantptr++, wsptr++) { |
---|
4043 | /* Even part */ |
---|
4044 | |
---|
4045 | tmp0 = DEQUANTIZE(inptr[DCTSIZE*0], quantptr[DCTSIZE*0]); |
---|
4046 | tmp0 <<= CONST_BITS; |
---|
4047 | /* Add fudge factor here for final descale. */ |
---|
4048 | tmp0 += ONE << (CONST_BITS-PASS1_BITS-1); |
---|
4049 | |
---|
4050 | z1 = DEQUANTIZE(inptr[DCTSIZE*4], quantptr[DCTSIZE*4]); |
---|
4051 | tmp1 = MULTIPLY(z1, FIX(1.306562965)); /* c4[16] = c2[8] */ |
---|
4052 | tmp2 = MULTIPLY(z1, FIX_0_541196100); /* c12[16] = c6[8] */ |
---|
4053 | |
---|
4054 | tmp10 = tmp0 + tmp1; |
---|
4055 | tmp11 = tmp0 - tmp1; |
---|
4056 | tmp12 = tmp0 + tmp2; |
---|
4057 | tmp13 = tmp0 - tmp2; |
---|
4058 | |
---|
4059 | z1 = DEQUANTIZE(inptr[DCTSIZE*2], quantptr[DCTSIZE*2]); |
---|
4060 | z2 = DEQUANTIZE(inptr[DCTSIZE*6], quantptr[DCTSIZE*6]); |
---|
4061 | z3 = z1 - z2; |
---|
4062 | z4 = MULTIPLY(z3, FIX(0.275899379)); /* c14[16] = c7[8] */ |
---|
4063 | z3 = MULTIPLY(z3, FIX(1.387039845)); /* c2[16] = c1[8] */ |
---|
4064 | |
---|
4065 | tmp0 = z3 + MULTIPLY(z2, FIX_2_562915447); /* (c6+c2)[16] = (c3+c1)[8] */ |
---|
4066 | tmp1 = z4 + MULTIPLY(z1, FIX_0_899976223); /* (c6-c14)[16] = (c3-c7)[8] */ |
---|
4067 | tmp2 = z3 - MULTIPLY(z1, FIX(0.601344887)); /* (c2-c10)[16] = (c1-c5)[8] */ |
---|
4068 | tmp3 = z4 - MULTIPLY(z2, FIX(0.509795579)); /* (c10-c14)[16] = (c5-c7)[8] */ |
---|
4069 | |
---|
4070 | tmp20 = tmp10 + tmp0; |
---|
4071 | tmp27 = tmp10 - tmp0; |
---|
4072 | tmp21 = tmp12 + tmp1; |
---|
4073 | tmp26 = tmp12 - tmp1; |
---|
4074 | tmp22 = tmp13 + tmp2; |
---|
4075 | tmp25 = tmp13 - tmp2; |
---|
4076 | tmp23 = tmp11 + tmp3; |
---|
4077 | tmp24 = tmp11 - tmp3; |
---|
4078 | |
---|
4079 | /* Odd part */ |
---|
4080 | |
---|
4081 | z1 = DEQUANTIZE(inptr[DCTSIZE*1], quantptr[DCTSIZE*1]); |
---|
4082 | z2 = DEQUANTIZE(inptr[DCTSIZE*3], quantptr[DCTSIZE*3]); |
---|
4083 | z3 = DEQUANTIZE(inptr[DCTSIZE*5], quantptr[DCTSIZE*5]); |
---|
4084 | z4 = DEQUANTIZE(inptr[DCTSIZE*7], quantptr[DCTSIZE*7]); |
---|
4085 | |
---|
4086 | tmp11 = z1 + z3; |
---|
4087 | |
---|
4088 | tmp1 = MULTIPLY(z1 + z2, FIX(1.353318001)); /* c3 */ |
---|
4089 | tmp2 = MULTIPLY(tmp11, FIX(1.247225013)); /* c5 */ |
---|
4090 | tmp3 = MULTIPLY(z1 + z4, FIX(1.093201867)); /* c7 */ |
---|
4091 | tmp10 = MULTIPLY(z1 - z4, FIX(0.897167586)); /* c9 */ |
---|
4092 | tmp11 = MULTIPLY(tmp11, FIX(0.666655658)); /* c11 */ |
---|
4093 | tmp12 = MULTIPLY(z1 - z2, FIX(0.410524528)); /* c13 */ |
---|
4094 | tmp0 = tmp1 + tmp2 + tmp3 - |
---|
4095 | MULTIPLY(z1, FIX(2.286341144)); /* c7+c5+c3-c1 */ |
---|
4096 | tmp13 = tmp10 + tmp11 + tmp12 - |
---|
4097 | MULTIPLY(z1, FIX(1.835730603)); /* c9+c11+c13-c15 */ |
---|
4098 | z1 = MULTIPLY(z2 + z3, FIX(0.138617169)); /* c15 */ |
---|
4099 | tmp1 += z1 + MULTIPLY(z2, FIX(0.071888074)); /* c9+c11-c3-c15 */ |
---|
4100 | tmp2 += z1 - MULTIPLY(z3, FIX(1.125726048)); /* c5+c7+c15-c3 */ |
---|
4101 | z1 = MULTIPLY(z3 - z2, FIX(1.407403738)); /* c1 */ |
---|
4102 | tmp11 += z1 - MULTIPLY(z3, FIX(0.766367282)); /* c1+c11-c9-c13 */ |
---|
4103 | tmp12 += z1 + MULTIPLY(z2, FIX(1.971951411)); /* c1+c5+c13-c7 */ |
---|
4104 | z2 += z4; |
---|
4105 | z1 = MULTIPLY(z2, - FIX(0.666655658)); /* -c11 */ |
---|
4106 | tmp1 += z1; |
---|
4107 | tmp3 += z1 + MULTIPLY(z4, FIX(1.065388962)); /* c3+c11+c15-c7 */ |
---|
4108 | z2 = MULTIPLY(z2, - FIX(1.247225013)); /* -c5 */ |
---|
4109 | tmp10 += z2 + MULTIPLY(z4, FIX(3.141271809)); /* c1+c5+c9-c13 */ |
---|
4110 | tmp12 += z2; |
---|
4111 | z2 = MULTIPLY(z3 + z4, - FIX(1.353318001)); /* -c3 */ |
---|
4112 | tmp2 += z2; |
---|
4113 | tmp3 += z2; |
---|
4114 | z2 = MULTIPLY(z4 - z3, FIX(0.410524528)); /* c13 */ |
---|
4115 | tmp10 += z2; |
---|
4116 | tmp11 += z2; |
---|
4117 | |
---|
4118 | /* Final output stage */ |
---|
4119 | |
---|
4120 | wsptr[8*0] = (int) RIGHT_SHIFT(tmp20 + tmp0, CONST_BITS-PASS1_BITS); |
---|
4121 | wsptr[8*15] = (int) RIGHT_SHIFT(tmp20 - tmp0, CONST_BITS-PASS1_BITS); |
---|
4122 | wsptr[8*1] = (int) RIGHT_SHIFT(tmp21 + tmp1, CONST_BITS-PASS1_BITS); |
---|
4123 | wsptr[8*14] = (int) RIGHT_SHIFT(tmp21 - tmp1, CONST_BITS-PASS1_BITS); |
---|
4124 | wsptr[8*2] = (int) RIGHT_SHIFT(tmp22 + tmp2, CONST_BITS-PASS1_BITS); |
---|
4125 | wsptr[8*13] = (int) RIGHT_SHIFT(tmp22 - tmp2, CONST_BITS-PASS1_BITS); |
---|
4126 | wsptr[8*3] = (int) RIGHT_SHIFT(tmp23 + tmp3, CONST_BITS-PASS1_BITS); |
---|
4127 | wsptr[8*12] = (int) RIGHT_SHIFT(tmp23 - tmp3, CONST_BITS-PASS1_BITS); |
---|
4128 | wsptr[8*4] = (int) RIGHT_SHIFT(tmp24 + tmp10, CONST_BITS-PASS1_BITS); |
---|
4129 | wsptr[8*11] = (int) RIGHT_SHIFT(tmp24 - tmp10, CONST_BITS-PASS1_BITS); |
---|
4130 | wsptr[8*5] = (int) RIGHT_SHIFT(tmp25 + tmp11, CONST_BITS-PASS1_BITS); |
---|
4131 | wsptr[8*10] = (int) RIGHT_SHIFT(tmp25 - tmp11, CONST_BITS-PASS1_BITS); |
---|
4132 | wsptr[8*6] = (int) RIGHT_SHIFT(tmp26 + tmp12, CONST_BITS-PASS1_BITS); |
---|
4133 | wsptr[8*9] = (int) RIGHT_SHIFT(tmp26 - tmp12, CONST_BITS-PASS1_BITS); |
---|
4134 | wsptr[8*7] = (int) RIGHT_SHIFT(tmp27 + tmp13, CONST_BITS-PASS1_BITS); |
---|
4135 | wsptr[8*8] = (int) RIGHT_SHIFT(tmp27 - tmp13, CONST_BITS-PASS1_BITS); |
---|
4136 | } |
---|
4137 | |
---|
4138 | /* Pass 2: process rows from work array, store into output array. */ |
---|
4139 | /* Note that we must descale the results by a factor of 8 == 2**3, */ |
---|
4140 | /* and also undo the PASS1_BITS scaling. */ |
---|
4141 | |
---|
4142 | wsptr = workspace; |
---|
4143 | for (ctr = 0; ctr < 16; ctr++) { |
---|
4144 | outptr = output_buf[ctr] + output_col; |
---|
4145 | |
---|
4146 | /* Even part: reverse the even part of the forward DCT. */ |
---|
4147 | /* The rotator is sqrt(2)*c(-6). */ |
---|
4148 | |
---|
4149 | z2 = (INT32) wsptr[2]; |
---|
4150 | z3 = (INT32) wsptr[6]; |
---|
4151 | |
---|
4152 | z1 = MULTIPLY(z2 + z3, FIX_0_541196100); |
---|
4153 | tmp2 = z1 + MULTIPLY(z2, FIX_0_765366865); |
---|
4154 | tmp3 = z1 - MULTIPLY(z3, FIX_1_847759065); |
---|
4155 | |
---|
4156 | /* Add fudge factor here for final descale. */ |
---|
4157 | z2 = (INT32) wsptr[0] + (ONE << (PASS1_BITS+2)); |
---|
4158 | z3 = (INT32) wsptr[4]; |
---|
4159 | |
---|
4160 | tmp0 = (z2 + z3) << CONST_BITS; |
---|
4161 | tmp1 = (z2 - z3) << CONST_BITS; |
---|
4162 | |
---|
4163 | tmp10 = tmp0 + tmp2; |
---|
4164 | tmp13 = tmp0 - tmp2; |
---|
4165 | tmp11 = tmp1 + tmp3; |
---|
4166 | tmp12 = tmp1 - tmp3; |
---|
4167 | |
---|
4168 | /* Odd part per figure 8; the matrix is unitary and hence its |
---|
4169 | * transpose is its inverse. i0..i3 are y7,y5,y3,y1 respectively. |
---|
4170 | */ |
---|
4171 | |
---|
4172 | tmp0 = (INT32) wsptr[7]; |
---|
4173 | tmp1 = (INT32) wsptr[5]; |
---|
4174 | tmp2 = (INT32) wsptr[3]; |
---|
4175 | tmp3 = (INT32) wsptr[1]; |
---|
4176 | |
---|
4177 | z2 = tmp0 + tmp2; |
---|
4178 | z3 = tmp1 + tmp3; |
---|
4179 | |
---|
4180 | z1 = MULTIPLY(z2 + z3, FIX_1_175875602); /* sqrt(2) * c3 */ |
---|
4181 | z2 = MULTIPLY(z2, - FIX_1_961570560); /* sqrt(2) * (-c3-c5) */ |
---|
4182 | z3 = MULTIPLY(z3, - FIX_0_390180644); /* sqrt(2) * (c5-c3) */ |
---|
4183 | z2 += z1; |
---|
4184 | z3 += z1; |
---|
4185 | |
---|
4186 | z1 = MULTIPLY(tmp0 + tmp3, - FIX_0_899976223); /* sqrt(2) * (c7-c3) */ |
---|
4187 | tmp0 = MULTIPLY(tmp0, FIX_0_298631336); /* sqrt(2) * (-c1+c3+c5-c7) */ |
---|
4188 | tmp3 = MULTIPLY(tmp3, FIX_1_501321110); /* sqrt(2) * ( c1+c3-c5-c7) */ |
---|
4189 | tmp0 += z1 + z2; |
---|
4190 | tmp3 += z1 + z3; |
---|
4191 | |
---|
4192 | z1 = MULTIPLY(tmp1 + tmp2, - FIX_2_562915447); /* sqrt(2) * (-c1-c3) */ |
---|
4193 | tmp1 = MULTIPLY(tmp1, FIX_2_053119869); /* sqrt(2) * ( c1+c3-c5+c7) */ |
---|
4194 | tmp2 = MULTIPLY(tmp2, FIX_3_072711026); /* sqrt(2) * ( c1+c3+c5-c7) */ |
---|
4195 | tmp1 += z1 + z3; |
---|
4196 | tmp2 += z1 + z2; |
---|
4197 | |
---|
4198 | /* Final output stage: inputs are tmp10..tmp13, tmp0..tmp3 */ |
---|
4199 | |
---|
4200 | outptr[0] = range_limit[(int) RIGHT_SHIFT(tmp10 + tmp3, |
---|
4201 | CONST_BITS+PASS1_BITS+3) |
---|
4202 | & RANGE_MASK]; |
---|
4203 | outptr[7] = range_limit[(int) RIGHT_SHIFT(tmp10 - tmp3, |
---|
4204 | CONST_BITS+PASS1_BITS+3) |
---|
4205 | & RANGE_MASK]; |
---|
4206 | outptr[1] = range_limit[(int) RIGHT_SHIFT(tmp11 + tmp2, |
---|
4207 | CONST_BITS+PASS1_BITS+3) |
---|
4208 | & RANGE_MASK]; |
---|
4209 | outptr[6] = range_limit[(int) RIGHT_SHIFT(tmp11 - tmp2, |
---|
4210 | CONST_BITS+PASS1_BITS+3) |
---|
4211 | & RANGE_MASK]; |
---|
4212 | outptr[2] = range_limit[(int) RIGHT_SHIFT(tmp12 + tmp1, |
---|
4213 | CONST_BITS+PASS1_BITS+3) |
---|
4214 | & RANGE_MASK]; |
---|
4215 | outptr[5] = range_limit[(int) RIGHT_SHIFT(tmp12 - tmp1, |
---|
4216 | CONST_BITS+PASS1_BITS+3) |
---|
4217 | & RANGE_MASK]; |
---|
4218 | outptr[3] = range_limit[(int) RIGHT_SHIFT(tmp13 + tmp0, |
---|
4219 | CONST_BITS+PASS1_BITS+3) |
---|
4220 | & RANGE_MASK]; |
---|
4221 | outptr[4] = range_limit[(int) RIGHT_SHIFT(tmp13 - tmp0, |
---|
4222 | CONST_BITS+PASS1_BITS+3) |
---|
4223 | & RANGE_MASK]; |
---|
4224 | |
---|
4225 | wsptr += DCTSIZE; /* advance pointer to next row */ |
---|
4226 | } |
---|
4227 | } |
---|
4228 | |
---|
4229 | |
---|
4230 | /* |
---|
4231 | * Perform dequantization and inverse DCT on one block of coefficients, |
---|
4232 | * producing a 7x14 output block. |
---|
4233 | * |
---|
4234 | * 14-point IDCT in pass 1 (columns), 7-point in pass 2 (rows). |
---|
4235 | */ |
---|
4236 | |
---|
4237 | GLOBAL(void) |
---|
4238 | jpeg_idct_7x14 (j_decompress_ptr cinfo, jpeg_component_info * compptr, |
---|
4239 | JCOEFPTR coef_block, |
---|
4240 | JSAMPARRAY output_buf, JDIMENSION output_col) |
---|
4241 | { |
---|
4242 | INT32 tmp10, tmp11, tmp12, tmp13, tmp14, tmp15, tmp16; |
---|
4243 | INT32 tmp20, tmp21, tmp22, tmp23, tmp24, tmp25, tmp26; |
---|
4244 | INT32 z1, z2, z3, z4; |
---|
4245 | JCOEFPTR inptr; |
---|
4246 | ISLOW_MULT_TYPE * quantptr; |
---|
4247 | int * wsptr; |
---|
4248 | JSAMPROW outptr; |
---|
4249 | JSAMPLE *range_limit = IDCT_range_limit(cinfo); |
---|
4250 | int ctr; |
---|
4251 | int workspace[7*14]; /* buffers data between passes */ |
---|
4252 | SHIFT_TEMPS |
---|
4253 | |
---|
4254 | /* Pass 1: process columns from input, store into work array. |
---|
4255 | * 14-point IDCT kernel, cK represents sqrt(2) * cos(K*pi/28). |
---|
4256 | */ |
---|
4257 | inptr = coef_block; |
---|
4258 | quantptr = (ISLOW_MULT_TYPE *) compptr->dct_table; |
---|
4259 | wsptr = workspace; |
---|
4260 | for (ctr = 0; ctr < 7; ctr++, inptr++, quantptr++, wsptr++) { |
---|
4261 | /* Even part */ |
---|
4262 | |
---|
4263 | z1 = DEQUANTIZE(inptr[DCTSIZE*0], quantptr[DCTSIZE*0]); |
---|
4264 | z1 <<= CONST_BITS; |
---|
4265 | /* Add fudge factor here for final descale. */ |
---|
4266 | z1 += ONE << (CONST_BITS-PASS1_BITS-1); |
---|
4267 | z4 = DEQUANTIZE(inptr[DCTSIZE*4], quantptr[DCTSIZE*4]); |
---|
4268 | z2 = MULTIPLY(z4, FIX(1.274162392)); /* c4 */ |
---|
4269 | z3 = MULTIPLY(z4, FIX(0.314692123)); /* c12 */ |
---|
4270 | z4 = MULTIPLY(z4, FIX(0.881747734)); /* c8 */ |
---|
4271 | |
---|
4272 | tmp10 = z1 + z2; |
---|
4273 | tmp11 = z1 + z3; |
---|
4274 | tmp12 = z1 - z4; |
---|
4275 | |
---|
4276 | tmp23 = RIGHT_SHIFT(z1 - ((z2 + z3 - z4) << 1), /* c0 = (c4+c12-c8)*2 */ |
---|
4277 | CONST_BITS-PASS1_BITS); |
---|
4278 | |
---|
4279 | z1 = DEQUANTIZE(inptr[DCTSIZE*2], quantptr[DCTSIZE*2]); |
---|
4280 | z2 = DEQUANTIZE(inptr[DCTSIZE*6], quantptr[DCTSIZE*6]); |
---|
4281 | |
---|
4282 | z3 = MULTIPLY(z1 + z2, FIX(1.105676686)); /* c6 */ |
---|
4283 | |
---|
4284 | tmp13 = z3 + MULTIPLY(z1, FIX(0.273079590)); /* c2-c6 */ |
---|
4285 | tmp14 = z3 - MULTIPLY(z2, FIX(1.719280954)); /* c6+c10 */ |
---|
4286 | tmp15 = MULTIPLY(z1, FIX(0.613604268)) - /* c10 */ |
---|
4287 | MULTIPLY(z2, FIX(1.378756276)); /* c2 */ |
---|
4288 | |
---|
4289 | tmp20 = tmp10 + tmp13; |
---|
4290 | tmp26 = tmp10 - tmp13; |
---|
4291 | tmp21 = tmp11 + tmp14; |
---|
4292 | tmp25 = tmp11 - tmp14; |
---|
4293 | tmp22 = tmp12 + tmp15; |
---|
4294 | tmp24 = tmp12 - tmp15; |
---|
4295 | |
---|
4296 | /* Odd part */ |
---|
4297 | |
---|
4298 | z1 = DEQUANTIZE(inptr[DCTSIZE*1], quantptr[DCTSIZE*1]); |
---|
4299 | z2 = DEQUANTIZE(inptr[DCTSIZE*3], quantptr[DCTSIZE*3]); |
---|
4300 | z3 = DEQUANTIZE(inptr[DCTSIZE*5], quantptr[DCTSIZE*5]); |
---|
4301 | z4 = DEQUANTIZE(inptr[DCTSIZE*7], quantptr[DCTSIZE*7]); |
---|
4302 | tmp13 = z4 << CONST_BITS; |
---|
4303 | |
---|
4304 | tmp14 = z1 + z3; |
---|
4305 | tmp11 = MULTIPLY(z1 + z2, FIX(1.334852607)); /* c3 */ |
---|
4306 | tmp12 = MULTIPLY(tmp14, FIX(1.197448846)); /* c5 */ |
---|
4307 | tmp10 = tmp11 + tmp12 + tmp13 - MULTIPLY(z1, FIX(1.126980169)); /* c3+c5-c1 */ |
---|
4308 | tmp14 = MULTIPLY(tmp14, FIX(0.752406978)); /* c9 */ |
---|
4309 | tmp16 = tmp14 - MULTIPLY(z1, FIX(1.061150426)); /* c9+c11-c13 */ |
---|
4310 | z1 -= z2; |
---|
4311 | tmp15 = MULTIPLY(z1, FIX(0.467085129)) - tmp13; /* c11 */ |
---|
4312 | tmp16 += tmp15; |
---|
4313 | z1 += z4; |
---|
4314 | z4 = MULTIPLY(z2 + z3, - FIX(0.158341681)) - tmp13; /* -c13 */ |
---|
4315 | tmp11 += z4 - MULTIPLY(z2, FIX(0.424103948)); /* c3-c9-c13 */ |
---|
4316 | tmp12 += z4 - MULTIPLY(z3, FIX(2.373959773)); /* c3+c5-c13 */ |
---|
4317 | z4 = MULTIPLY(z3 - z2, FIX(1.405321284)); /* c1 */ |
---|
4318 | tmp14 += z4 + tmp13 - MULTIPLY(z3, FIX(1.6906431334)); /* c1+c9-c11 */ |
---|
4319 | tmp15 += z4 + MULTIPLY(z2, FIX(0.674957567)); /* c1+c11-c5 */ |
---|
4320 | |
---|
4321 | tmp13 = (z1 - z3) << PASS1_BITS; |
---|
4322 | |
---|
4323 | /* Final output stage */ |
---|
4324 | |
---|
4325 | wsptr[7*0] = (int) RIGHT_SHIFT(tmp20 + tmp10, CONST_BITS-PASS1_BITS); |
---|
4326 | wsptr[7*13] = (int) RIGHT_SHIFT(tmp20 - tmp10, CONST_BITS-PASS1_BITS); |
---|
4327 | wsptr[7*1] = (int) RIGHT_SHIFT(tmp21 + tmp11, CONST_BITS-PASS1_BITS); |
---|
4328 | wsptr[7*12] = (int) RIGHT_SHIFT(tmp21 - tmp11, CONST_BITS-PASS1_BITS); |
---|
4329 | wsptr[7*2] = (int) RIGHT_SHIFT(tmp22 + tmp12, CONST_BITS-PASS1_BITS); |
---|
4330 | wsptr[7*11] = (int) RIGHT_SHIFT(tmp22 - tmp12, CONST_BITS-PASS1_BITS); |
---|
4331 | wsptr[7*3] = (int) (tmp23 + tmp13); |
---|
4332 | wsptr[7*10] = (int) (tmp23 - tmp13); |
---|
4333 | wsptr[7*4] = (int) RIGHT_SHIFT(tmp24 + tmp14, CONST_BITS-PASS1_BITS); |
---|
4334 | wsptr[7*9] = (int) RIGHT_SHIFT(tmp24 - tmp14, CONST_BITS-PASS1_BITS); |
---|
4335 | wsptr[7*5] = (int) RIGHT_SHIFT(tmp25 + tmp15, CONST_BITS-PASS1_BITS); |
---|
4336 | wsptr[7*8] = (int) RIGHT_SHIFT(tmp25 - tmp15, CONST_BITS-PASS1_BITS); |
---|
4337 | wsptr[7*6] = (int) RIGHT_SHIFT(tmp26 + tmp16, CONST_BITS-PASS1_BITS); |
---|
4338 | wsptr[7*7] = (int) RIGHT_SHIFT(tmp26 - tmp16, CONST_BITS-PASS1_BITS); |
---|
4339 | } |
---|
4340 | |
---|
4341 | /* Pass 2: process 14 rows from work array, store into output array. |
---|
4342 | * 7-point IDCT kernel, cK represents sqrt(2) * cos(K*pi/14). |
---|
4343 | */ |
---|
4344 | wsptr = workspace; |
---|
4345 | for (ctr = 0; ctr < 14; ctr++) { |
---|
4346 | outptr = output_buf[ctr] + output_col; |
---|
4347 | |
---|
4348 | /* Even part */ |
---|
4349 | |
---|
4350 | /* Add fudge factor here for final descale. */ |
---|
4351 | tmp23 = (INT32) wsptr[0] + (ONE << (PASS1_BITS+2)); |
---|
4352 | tmp23 <<= CONST_BITS; |
---|
4353 | |
---|
4354 | z1 = (INT32) wsptr[2]; |
---|
4355 | z2 = (INT32) wsptr[4]; |
---|
4356 | z3 = (INT32) wsptr[6]; |
---|
4357 | |
---|
4358 | tmp20 = MULTIPLY(z2 - z3, FIX(0.881747734)); /* c4 */ |
---|
4359 | tmp22 = MULTIPLY(z1 - z2, FIX(0.314692123)); /* c6 */ |
---|
4360 | tmp21 = tmp20 + tmp22 + tmp23 - MULTIPLY(z2, FIX(1.841218003)); /* c2+c4-c6 */ |
---|
4361 | tmp10 = z1 + z3; |
---|
4362 | z2 -= tmp10; |
---|
4363 | tmp10 = MULTIPLY(tmp10, FIX(1.274162392)) + tmp23; /* c2 */ |
---|
4364 | tmp20 += tmp10 - MULTIPLY(z3, FIX(0.077722536)); /* c2-c4-c6 */ |
---|
4365 | tmp22 += tmp10 - MULTIPLY(z1, FIX(2.470602249)); /* c2+c4+c6 */ |
---|
4366 | tmp23 += MULTIPLY(z2, FIX(1.414213562)); /* c0 */ |
---|
4367 | |
---|
4368 | /* Odd part */ |
---|
4369 | |
---|
4370 | z1 = (INT32) wsptr[1]; |
---|
4371 | z2 = (INT32) wsptr[3]; |
---|
4372 | z3 = (INT32) wsptr[5]; |
---|
4373 | |
---|
4374 | tmp11 = MULTIPLY(z1 + z2, FIX(0.935414347)); /* (c3+c1-c5)/2 */ |
---|
4375 | tmp12 = MULTIPLY(z1 - z2, FIX(0.170262339)); /* (c3+c5-c1)/2 */ |
---|
4376 | tmp10 = tmp11 - tmp12; |
---|
4377 | tmp11 += tmp12; |
---|
4378 | tmp12 = MULTIPLY(z2 + z3, - FIX(1.378756276)); /* -c1 */ |
---|
4379 | tmp11 += tmp12; |
---|
4380 | z2 = MULTIPLY(z1 + z3, FIX(0.613604268)); /* c5 */ |
---|
4381 | tmp10 += z2; |
---|
4382 | tmp12 += z2 + MULTIPLY(z3, FIX(1.870828693)); /* c3+c1-c5 */ |
---|
4383 | |
---|
4384 | /* Final output stage */ |
---|
4385 | |
---|
4386 | outptr[0] = range_limit[(int) RIGHT_SHIFT(tmp20 + tmp10, |
---|
4387 | CONST_BITS+PASS1_BITS+3) |
---|
4388 | & RANGE_MASK]; |
---|
4389 | outptr[6] = range_limit[(int) RIGHT_SHIFT(tmp20 - tmp10, |
---|
4390 | CONST_BITS+PASS1_BITS+3) |
---|
4391 | & RANGE_MASK]; |
---|
4392 | outptr[1] = range_limit[(int) RIGHT_SHIFT(tmp21 + tmp11, |
---|
4393 | CONST_BITS+PASS1_BITS+3) |
---|
4394 | & RANGE_MASK]; |
---|
4395 | outptr[5] = range_limit[(int) RIGHT_SHIFT(tmp21 - tmp11, |
---|
4396 | CONST_BITS+PASS1_BITS+3) |
---|
4397 | & RANGE_MASK]; |
---|
4398 | outptr[2] = range_limit[(int) RIGHT_SHIFT(tmp22 + tmp12, |
---|
4399 | CONST_BITS+PASS1_BITS+3) |
---|
4400 | & RANGE_MASK]; |
---|
4401 | outptr[4] = range_limit[(int) RIGHT_SHIFT(tmp22 - tmp12, |
---|
4402 | CONST_BITS+PASS1_BITS+3) |
---|
4403 | & RANGE_MASK]; |
---|
4404 | outptr[3] = range_limit[(int) RIGHT_SHIFT(tmp23, |
---|
4405 | CONST_BITS+PASS1_BITS+3) |
---|
4406 | & RANGE_MASK]; |
---|
4407 | |
---|
4408 | wsptr += 7; /* advance pointer to next row */ |
---|
4409 | } |
---|
4410 | } |
---|
4411 | |
---|
4412 | |
---|
4413 | /* |
---|
4414 | * Perform dequantization and inverse DCT on one block of coefficients, |
---|
4415 | * producing a 6x12 output block. |
---|
4416 | * |
---|
4417 | * 12-point IDCT in pass 1 (columns), 6-point in pass 2 (rows). |
---|
4418 | */ |
---|
4419 | |
---|
4420 | GLOBAL(void) |
---|
4421 | jpeg_idct_6x12 (j_decompress_ptr cinfo, jpeg_component_info * compptr, |
---|
4422 | JCOEFPTR coef_block, |
---|
4423 | JSAMPARRAY output_buf, JDIMENSION output_col) |
---|
4424 | { |
---|
4425 | INT32 tmp10, tmp11, tmp12, tmp13, tmp14, tmp15; |
---|
4426 | INT32 tmp20, tmp21, tmp22, tmp23, tmp24, tmp25; |
---|
4427 | INT32 z1, z2, z3, z4; |
---|
4428 | JCOEFPTR inptr; |
---|
4429 | ISLOW_MULT_TYPE * quantptr; |
---|
4430 | int * wsptr; |
---|
4431 | JSAMPROW outptr; |
---|
4432 | JSAMPLE *range_limit = IDCT_range_limit(cinfo); |
---|
4433 | int ctr; |
---|
4434 | int workspace[6*12]; /* buffers data between passes */ |
---|
4435 | SHIFT_TEMPS |
---|
4436 | |
---|
4437 | /* Pass 1: process columns from input, store into work array. |
---|
4438 | * 12-point IDCT kernel, cK represents sqrt(2) * cos(K*pi/24). |
---|
4439 | */ |
---|
4440 | inptr = coef_block; |
---|
4441 | quantptr = (ISLOW_MULT_TYPE *) compptr->dct_table; |
---|
4442 | wsptr = workspace; |
---|
4443 | for (ctr = 0; ctr < 6; ctr++, inptr++, quantptr++, wsptr++) { |
---|
4444 | /* Even part */ |
---|
4445 | |
---|
4446 | z3 = DEQUANTIZE(inptr[DCTSIZE*0], quantptr[DCTSIZE*0]); |
---|
4447 | z3 <<= CONST_BITS; |
---|
4448 | /* Add fudge factor here for final descale. */ |
---|
4449 | z3 += ONE << (CONST_BITS-PASS1_BITS-1); |
---|
4450 | |
---|
4451 | z4 = DEQUANTIZE(inptr[DCTSIZE*4], quantptr[DCTSIZE*4]); |
---|
4452 | z4 = MULTIPLY(z4, FIX(1.224744871)); /* c4 */ |
---|
4453 | |
---|
4454 | tmp10 = z3 + z4; |
---|
4455 | tmp11 = z3 - z4; |
---|
4456 | |
---|
4457 | z1 = DEQUANTIZE(inptr[DCTSIZE*2], quantptr[DCTSIZE*2]); |
---|
4458 | z4 = MULTIPLY(z1, FIX(1.366025404)); /* c2 */ |
---|
4459 | z1 <<= CONST_BITS; |
---|
4460 | z2 = DEQUANTIZE(inptr[DCTSIZE*6], quantptr[DCTSIZE*6]); |
---|
4461 | z2 <<= CONST_BITS; |
---|
4462 | |
---|
4463 | tmp12 = z1 - z2; |
---|
4464 | |
---|
4465 | tmp21 = z3 + tmp12; |
---|
4466 | tmp24 = z3 - tmp12; |
---|
4467 | |
---|
4468 | tmp12 = z4 + z2; |
---|
4469 | |
---|
4470 | tmp20 = tmp10 + tmp12; |
---|
4471 | tmp25 = tmp10 - tmp12; |
---|
4472 | |
---|
4473 | tmp12 = z4 - z1 - z2; |
---|
4474 | |
---|
4475 | tmp22 = tmp11 + tmp12; |
---|
4476 | tmp23 = tmp11 - tmp12; |
---|
4477 | |
---|
4478 | /* Odd part */ |
---|
4479 | |
---|
4480 | z1 = DEQUANTIZE(inptr[DCTSIZE*1], quantptr[DCTSIZE*1]); |
---|
4481 | z2 = DEQUANTIZE(inptr[DCTSIZE*3], quantptr[DCTSIZE*3]); |
---|
4482 | z3 = DEQUANTIZE(inptr[DCTSIZE*5], quantptr[DCTSIZE*5]); |
---|
4483 | z4 = DEQUANTIZE(inptr[DCTSIZE*7], quantptr[DCTSIZE*7]); |
---|
4484 | |
---|
4485 | tmp11 = MULTIPLY(z2, FIX(1.306562965)); /* c3 */ |
---|
4486 | tmp14 = MULTIPLY(z2, - FIX_0_541196100); /* -c9 */ |
---|
4487 | |
---|
4488 | tmp10 = z1 + z3; |
---|
4489 | tmp15 = MULTIPLY(tmp10 + z4, FIX(0.860918669)); /* c7 */ |
---|
4490 | tmp12 = tmp15 + MULTIPLY(tmp10, FIX(0.261052384)); /* c5-c7 */ |
---|
4491 | tmp10 = tmp12 + tmp11 + MULTIPLY(z1, FIX(0.280143716)); /* c1-c5 */ |
---|
4492 | tmp13 = MULTIPLY(z3 + z4, - FIX(1.045510580)); /* -(c7+c11) */ |
---|
4493 | tmp12 += tmp13 + tmp14 - MULTIPLY(z3, FIX(1.478575242)); /* c1+c5-c7-c11 */ |
---|
4494 | tmp13 += tmp15 - tmp11 + MULTIPLY(z4, FIX(1.586706681)); /* c1+c11 */ |
---|
4495 | tmp15 += tmp14 - MULTIPLY(z1, FIX(0.676326758)) - /* c7-c11 */ |
---|
4496 | MULTIPLY(z4, FIX(1.982889723)); /* c5+c7 */ |
---|
4497 | |
---|
4498 | z1 -= z4; |
---|
4499 | z2 -= z3; |
---|
4500 | z3 = MULTIPLY(z1 + z2, FIX_0_541196100); /* c9 */ |
---|
4501 | tmp11 = z3 + MULTIPLY(z1, FIX_0_765366865); /* c3-c9 */ |
---|
4502 | tmp14 = z3 - MULTIPLY(z2, FIX_1_847759065); /* c3+c9 */ |
---|
4503 | |
---|
4504 | /* Final output stage */ |
---|
4505 | |
---|
4506 | wsptr[6*0] = (int) RIGHT_SHIFT(tmp20 + tmp10, CONST_BITS-PASS1_BITS); |
---|
4507 | wsptr[6*11] = (int) RIGHT_SHIFT(tmp20 - tmp10, CONST_BITS-PASS1_BITS); |
---|
4508 | wsptr[6*1] = (int) RIGHT_SHIFT(tmp21 + tmp11, CONST_BITS-PASS1_BITS); |
---|
4509 | wsptr[6*10] = (int) RIGHT_SHIFT(tmp21 - tmp11, CONST_BITS-PASS1_BITS); |
---|
4510 | wsptr[6*2] = (int) RIGHT_SHIFT(tmp22 + tmp12, CONST_BITS-PASS1_BITS); |
---|
4511 | wsptr[6*9] = (int) RIGHT_SHIFT(tmp22 - tmp12, CONST_BITS-PASS1_BITS); |
---|
4512 | wsptr[6*3] = (int) RIGHT_SHIFT(tmp23 + tmp13, CONST_BITS-PASS1_BITS); |
---|
4513 | wsptr[6*8] = (int) RIGHT_SHIFT(tmp23 - tmp13, CONST_BITS-PASS1_BITS); |
---|
4514 | wsptr[6*4] = (int) RIGHT_SHIFT(tmp24 + tmp14, CONST_BITS-PASS1_BITS); |
---|
4515 | wsptr[6*7] = (int) RIGHT_SHIFT(tmp24 - tmp14, CONST_BITS-PASS1_BITS); |
---|
4516 | wsptr[6*5] = (int) RIGHT_SHIFT(tmp25 + tmp15, CONST_BITS-PASS1_BITS); |
---|
4517 | wsptr[6*6] = (int) RIGHT_SHIFT(tmp25 - tmp15, CONST_BITS-PASS1_BITS); |
---|
4518 | } |
---|
4519 | |
---|
4520 | /* Pass 2: process 12 rows from work array, store into output array. |
---|
4521 | * 6-point IDCT kernel, cK represents sqrt(2) * cos(K*pi/12). |
---|
4522 | */ |
---|
4523 | wsptr = workspace; |
---|
4524 | for (ctr = 0; ctr < 12; ctr++) { |
---|
4525 | outptr = output_buf[ctr] + output_col; |
---|
4526 | |
---|
4527 | /* Even part */ |
---|
4528 | |
---|
4529 | /* Add fudge factor here for final descale. */ |
---|
4530 | tmp10 = (INT32) wsptr[0] + (ONE << (PASS1_BITS+2)); |
---|
4531 | tmp10 <<= CONST_BITS; |
---|
4532 | tmp12 = (INT32) wsptr[4]; |
---|
4533 | tmp20 = MULTIPLY(tmp12, FIX(0.707106781)); /* c4 */ |
---|
4534 | tmp11 = tmp10 + tmp20; |
---|
4535 | tmp21 = tmp10 - tmp20 - tmp20; |
---|
4536 | tmp20 = (INT32) wsptr[2]; |
---|
4537 | tmp10 = MULTIPLY(tmp20, FIX(1.224744871)); /* c2 */ |
---|
4538 | tmp20 = tmp11 + tmp10; |
---|
4539 | tmp22 = tmp11 - tmp10; |
---|
4540 | |
---|
4541 | /* Odd part */ |
---|
4542 | |
---|
4543 | z1 = (INT32) wsptr[1]; |
---|
4544 | z2 = (INT32) wsptr[3]; |
---|
4545 | z3 = (INT32) wsptr[5]; |
---|
4546 | tmp11 = MULTIPLY(z1 + z3, FIX(0.366025404)); /* c5 */ |
---|
4547 | tmp10 = tmp11 + ((z1 + z2) << CONST_BITS); |
---|
4548 | tmp12 = tmp11 + ((z3 - z2) << CONST_BITS); |
---|
4549 | tmp11 = (z1 - z2 - z3) << CONST_BITS; |
---|
4550 | |
---|
4551 | /* Final output stage */ |
---|
4552 | |
---|
4553 | outptr[0] = range_limit[(int) RIGHT_SHIFT(tmp20 + tmp10, |
---|
4554 | CONST_BITS+PASS1_BITS+3) |
---|
4555 | & RANGE_MASK]; |
---|
4556 | outptr[5] = range_limit[(int) RIGHT_SHIFT(tmp20 - tmp10, |
---|
4557 | CONST_BITS+PASS1_BITS+3) |
---|
4558 | & RANGE_MASK]; |
---|
4559 | outptr[1] = range_limit[(int) RIGHT_SHIFT(tmp21 + tmp11, |
---|
4560 | CONST_BITS+PASS1_BITS+3) |
---|
4561 | & RANGE_MASK]; |
---|
4562 | outptr[4] = range_limit[(int) RIGHT_SHIFT(tmp21 - tmp11, |
---|
4563 | CONST_BITS+PASS1_BITS+3) |
---|
4564 | & RANGE_MASK]; |
---|
4565 | outptr[2] = range_limit[(int) RIGHT_SHIFT(tmp22 + tmp12, |
---|
4566 | CONST_BITS+PASS1_BITS+3) |
---|
4567 | & RANGE_MASK]; |
---|
4568 | outptr[3] = range_limit[(int) RIGHT_SHIFT(tmp22 - tmp12, |
---|
4569 | CONST_BITS+PASS1_BITS+3) |
---|
4570 | & RANGE_MASK]; |
---|
4571 | |
---|
4572 | wsptr += 6; /* advance pointer to next row */ |
---|
4573 | } |
---|
4574 | } |
---|
4575 | |
---|
4576 | |
---|
4577 | /* |
---|
4578 | * Perform dequantization and inverse DCT on one block of coefficients, |
---|
4579 | * producing a 5x10 output block. |
---|
4580 | * |
---|
4581 | * 10-point IDCT in pass 1 (columns), 5-point in pass 2 (rows). |
---|
4582 | */ |
---|
4583 | |
---|
4584 | GLOBAL(void) |
---|
4585 | jpeg_idct_5x10 (j_decompress_ptr cinfo, jpeg_component_info * compptr, |
---|
4586 | JCOEFPTR coef_block, |
---|
4587 | JSAMPARRAY output_buf, JDIMENSION output_col) |
---|
4588 | { |
---|
4589 | INT32 tmp10, tmp11, tmp12, tmp13, tmp14; |
---|
4590 | INT32 tmp20, tmp21, tmp22, tmp23, tmp24; |
---|
4591 | INT32 z1, z2, z3, z4, z5; |
---|
4592 | JCOEFPTR inptr; |
---|
4593 | ISLOW_MULT_TYPE * quantptr; |
---|
4594 | int * wsptr; |
---|
4595 | JSAMPROW outptr; |
---|
4596 | JSAMPLE *range_limit = IDCT_range_limit(cinfo); |
---|
4597 | int ctr; |
---|
4598 | int workspace[5*10]; /* buffers data between passes */ |
---|
4599 | SHIFT_TEMPS |
---|
4600 | |
---|
4601 | /* Pass 1: process columns from input, store into work array. |
---|
4602 | * 10-point IDCT kernel, cK represents sqrt(2) * cos(K*pi/20). |
---|
4603 | */ |
---|
4604 | inptr = coef_block; |
---|
4605 | quantptr = (ISLOW_MULT_TYPE *) compptr->dct_table; |
---|
4606 | wsptr = workspace; |
---|
4607 | for (ctr = 0; ctr < 5; ctr++, inptr++, quantptr++, wsptr++) { |
---|
4608 | /* Even part */ |
---|
4609 | |
---|
4610 | z3 = DEQUANTIZE(inptr[DCTSIZE*0], quantptr[DCTSIZE*0]); |
---|
4611 | z3 <<= CONST_BITS; |
---|
4612 | /* Add fudge factor here for final descale. */ |
---|
4613 | z3 += ONE << (CONST_BITS-PASS1_BITS-1); |
---|
4614 | z4 = DEQUANTIZE(inptr[DCTSIZE*4], quantptr[DCTSIZE*4]); |
---|
4615 | z1 = MULTIPLY(z4, FIX(1.144122806)); /* c4 */ |
---|
4616 | z2 = MULTIPLY(z4, FIX(0.437016024)); /* c8 */ |
---|
4617 | tmp10 = z3 + z1; |
---|
4618 | tmp11 = z3 - z2; |
---|
4619 | |
---|
4620 | tmp22 = RIGHT_SHIFT(z3 - ((z1 - z2) << 1), /* c0 = (c4-c8)*2 */ |
---|
4621 | CONST_BITS-PASS1_BITS); |
---|
4622 | |
---|
4623 | z2 = DEQUANTIZE(inptr[DCTSIZE*2], quantptr[DCTSIZE*2]); |
---|
4624 | z3 = DEQUANTIZE(inptr[DCTSIZE*6], quantptr[DCTSIZE*6]); |
---|
4625 | |
---|
4626 | z1 = MULTIPLY(z2 + z3, FIX(0.831253876)); /* c6 */ |
---|
4627 | tmp12 = z1 + MULTIPLY(z2, FIX(0.513743148)); /* c2-c6 */ |
---|
4628 | tmp13 = z1 - MULTIPLY(z3, FIX(2.176250899)); /* c2+c6 */ |
---|
4629 | |
---|
4630 | tmp20 = tmp10 + tmp12; |
---|
4631 | tmp24 = tmp10 - tmp12; |
---|
4632 | tmp21 = tmp11 + tmp13; |
---|
4633 | tmp23 = tmp11 - tmp13; |
---|
4634 | |
---|
4635 | /* Odd part */ |
---|
4636 | |
---|
4637 | z1 = DEQUANTIZE(inptr[DCTSIZE*1], quantptr[DCTSIZE*1]); |
---|
4638 | z2 = DEQUANTIZE(inptr[DCTSIZE*3], quantptr[DCTSIZE*3]); |
---|
4639 | z3 = DEQUANTIZE(inptr[DCTSIZE*5], quantptr[DCTSIZE*5]); |
---|
4640 | z4 = DEQUANTIZE(inptr[DCTSIZE*7], quantptr[DCTSIZE*7]); |
---|
4641 | |
---|
4642 | tmp11 = z2 + z4; |
---|
4643 | tmp13 = z2 - z4; |
---|
4644 | |
---|
4645 | tmp12 = MULTIPLY(tmp13, FIX(0.309016994)); /* (c3-c7)/2 */ |
---|
4646 | z5 = z3 << CONST_BITS; |
---|
4647 | |
---|
4648 | z2 = MULTIPLY(tmp11, FIX(0.951056516)); /* (c3+c7)/2 */ |
---|
4649 | z4 = z5 + tmp12; |
---|
4650 | |
---|
4651 | tmp10 = MULTIPLY(z1, FIX(1.396802247)) + z2 + z4; /* c1 */ |
---|
4652 | tmp14 = MULTIPLY(z1, FIX(0.221231742)) - z2 + z4; /* c9 */ |
---|
4653 | |
---|
4654 | z2 = MULTIPLY(tmp11, FIX(0.587785252)); /* (c1-c9)/2 */ |
---|
4655 | z4 = z5 - tmp12 - (tmp13 << (CONST_BITS - 1)); |
---|
4656 | |
---|
4657 | tmp12 = (z1 - tmp13 - z3) << PASS1_BITS; |
---|
4658 | |
---|
4659 | tmp11 = MULTIPLY(z1, FIX(1.260073511)) - z2 - z4; /* c3 */ |
---|
4660 | tmp13 = MULTIPLY(z1, FIX(0.642039522)) - z2 + z4; /* c7 */ |
---|
4661 | |
---|
4662 | /* Final output stage */ |
---|
4663 | |
---|
4664 | wsptr[5*0] = (int) RIGHT_SHIFT(tmp20 + tmp10, CONST_BITS-PASS1_BITS); |
---|
4665 | wsptr[5*9] = (int) RIGHT_SHIFT(tmp20 - tmp10, CONST_BITS-PASS1_BITS); |
---|
4666 | wsptr[5*1] = (int) RIGHT_SHIFT(tmp21 + tmp11, CONST_BITS-PASS1_BITS); |
---|
4667 | wsptr[5*8] = (int) RIGHT_SHIFT(tmp21 - tmp11, CONST_BITS-PASS1_BITS); |
---|
4668 | wsptr[5*2] = (int) (tmp22 + tmp12); |
---|
4669 | wsptr[5*7] = (int) (tmp22 - tmp12); |
---|
4670 | wsptr[5*3] = (int) RIGHT_SHIFT(tmp23 + tmp13, CONST_BITS-PASS1_BITS); |
---|
4671 | wsptr[5*6] = (int) RIGHT_SHIFT(tmp23 - tmp13, CONST_BITS-PASS1_BITS); |
---|
4672 | wsptr[5*4] = (int) RIGHT_SHIFT(tmp24 + tmp14, CONST_BITS-PASS1_BITS); |
---|
4673 | wsptr[5*5] = (int) RIGHT_SHIFT(tmp24 - tmp14, CONST_BITS-PASS1_BITS); |
---|
4674 | } |
---|
4675 | |
---|
4676 | /* Pass 2: process 10 rows from work array, store into output array. |
---|
4677 | * 5-point IDCT kernel, cK represents sqrt(2) * cos(K*pi/10). |
---|
4678 | */ |
---|
4679 | wsptr = workspace; |
---|
4680 | for (ctr = 0; ctr < 10; ctr++) { |
---|
4681 | outptr = output_buf[ctr] + output_col; |
---|
4682 | |
---|
4683 | /* Even part */ |
---|
4684 | |
---|
4685 | /* Add fudge factor here for final descale. */ |
---|
4686 | tmp12 = (INT32) wsptr[0] + (ONE << (PASS1_BITS+2)); |
---|
4687 | tmp12 <<= CONST_BITS; |
---|
4688 | tmp13 = (INT32) wsptr[2]; |
---|
4689 | tmp14 = (INT32) wsptr[4]; |
---|
4690 | z1 = MULTIPLY(tmp13 + tmp14, FIX(0.790569415)); /* (c2+c4)/2 */ |
---|
4691 | z2 = MULTIPLY(tmp13 - tmp14, FIX(0.353553391)); /* (c2-c4)/2 */ |
---|
4692 | z3 = tmp12 + z2; |
---|
4693 | tmp10 = z3 + z1; |
---|
4694 | tmp11 = z3 - z1; |
---|
4695 | tmp12 -= z2 << 2; |
---|
4696 | |
---|
4697 | /* Odd part */ |
---|
4698 | |
---|
4699 | z2 = (INT32) wsptr[1]; |
---|
4700 | z3 = (INT32) wsptr[3]; |
---|
4701 | |
---|
4702 | z1 = MULTIPLY(z2 + z3, FIX(0.831253876)); /* c3 */ |
---|
4703 | tmp13 = z1 + MULTIPLY(z2, FIX(0.513743148)); /* c1-c3 */ |
---|
4704 | tmp14 = z1 - MULTIPLY(z3, FIX(2.176250899)); /* c1+c3 */ |
---|
4705 | |
---|
4706 | /* Final output stage */ |
---|
4707 | |
---|
4708 | outptr[0] = range_limit[(int) RIGHT_SHIFT(tmp10 + tmp13, |
---|
4709 | CONST_BITS+PASS1_BITS+3) |
---|
4710 | & RANGE_MASK]; |
---|
4711 | outptr[4] = range_limit[(int) RIGHT_SHIFT(tmp10 - tmp13, |
---|
4712 | CONST_BITS+PASS1_BITS+3) |
---|
4713 | & RANGE_MASK]; |
---|
4714 | outptr[1] = range_limit[(int) RIGHT_SHIFT(tmp11 + tmp14, |
---|
4715 | CONST_BITS+PASS1_BITS+3) |
---|
4716 | & RANGE_MASK]; |
---|
4717 | outptr[3] = range_limit[(int) RIGHT_SHIFT(tmp11 - tmp14, |
---|
4718 | CONST_BITS+PASS1_BITS+3) |
---|
4719 | & RANGE_MASK]; |
---|
4720 | outptr[2] = range_limit[(int) RIGHT_SHIFT(tmp12, |
---|
4721 | CONST_BITS+PASS1_BITS+3) |
---|
4722 | & RANGE_MASK]; |
---|
4723 | |
---|
4724 | wsptr += 5; /* advance pointer to next row */ |
---|
4725 | } |
---|
4726 | } |
---|
4727 | |
---|
4728 | |
---|
4729 | /* |
---|
4730 | * Perform dequantization and inverse DCT on one block of coefficients, |
---|
4731 | * producing a 4x8 output block. |
---|
4732 | * |
---|
4733 | * 8-point IDCT in pass 1 (columns), 4-point in pass 2 (rows). |
---|
4734 | */ |
---|
4735 | |
---|
4736 | GLOBAL(void) |
---|
4737 | jpeg_idct_4x8 (j_decompress_ptr cinfo, jpeg_component_info * compptr, |
---|
4738 | JCOEFPTR coef_block, |
---|
4739 | JSAMPARRAY output_buf, JDIMENSION output_col) |
---|
4740 | { |
---|
4741 | INT32 tmp0, tmp1, tmp2, tmp3; |
---|
4742 | INT32 tmp10, tmp11, tmp12, tmp13; |
---|
4743 | INT32 z1, z2, z3; |
---|
4744 | JCOEFPTR inptr; |
---|
4745 | ISLOW_MULT_TYPE * quantptr; |
---|
4746 | int * wsptr; |
---|
4747 | JSAMPROW outptr; |
---|
4748 | JSAMPLE *range_limit = IDCT_range_limit(cinfo); |
---|
4749 | int ctr; |
---|
4750 | int workspace[4*8]; /* buffers data between passes */ |
---|
4751 | SHIFT_TEMPS |
---|
4752 | |
---|
4753 | /* Pass 1: process columns from input, store into work array. */ |
---|
4754 | /* Note results are scaled up by sqrt(8) compared to a true IDCT; */ |
---|
4755 | /* furthermore, we scale the results by 2**PASS1_BITS. */ |
---|
4756 | |
---|
4757 | inptr = coef_block; |
---|
4758 | quantptr = (ISLOW_MULT_TYPE *) compptr->dct_table; |
---|
4759 | wsptr = workspace; |
---|
4760 | for (ctr = 4; ctr > 0; ctr--) { |
---|
4761 | /* Due to quantization, we will usually find that many of the input |
---|
4762 | * coefficients are zero, especially the AC terms. We can exploit this |
---|
4763 | * by short-circuiting the IDCT calculation for any column in which all |
---|
4764 | * the AC terms are zero. In that case each output is equal to the |
---|
4765 | * DC coefficient (with scale factor as needed). |
---|
4766 | * With typical images and quantization tables, half or more of the |
---|
4767 | * column DCT calculations can be simplified this way. |
---|
4768 | */ |
---|
4769 | |
---|
4770 | if (inptr[DCTSIZE*1] == 0 && inptr[DCTSIZE*2] == 0 && |
---|
4771 | inptr[DCTSIZE*3] == 0 && inptr[DCTSIZE*4] == 0 && |
---|
4772 | inptr[DCTSIZE*5] == 0 && inptr[DCTSIZE*6] == 0 && |
---|
4773 | inptr[DCTSIZE*7] == 0) { |
---|
4774 | /* AC terms all zero */ |
---|
4775 | int dcval = DEQUANTIZE(inptr[DCTSIZE*0], quantptr[DCTSIZE*0]) << PASS1_BITS; |
---|
4776 | |
---|
4777 | wsptr[4*0] = dcval; |
---|
4778 | wsptr[4*1] = dcval; |
---|
4779 | wsptr[4*2] = dcval; |
---|
4780 | wsptr[4*3] = dcval; |
---|
4781 | wsptr[4*4] = dcval; |
---|
4782 | wsptr[4*5] = dcval; |
---|
4783 | wsptr[4*6] = dcval; |
---|
4784 | wsptr[4*7] = dcval; |
---|
4785 | |
---|
4786 | inptr++; /* advance pointers to next column */ |
---|
4787 | quantptr++; |
---|
4788 | wsptr++; |
---|
4789 | continue; |
---|
4790 | } |
---|
4791 | |
---|
4792 | /* Even part: reverse the even part of the forward DCT. */ |
---|
4793 | /* The rotator is sqrt(2)*c(-6). */ |
---|
4794 | |
---|
4795 | z2 = DEQUANTIZE(inptr[DCTSIZE*2], quantptr[DCTSIZE*2]); |
---|
4796 | z3 = DEQUANTIZE(inptr[DCTSIZE*6], quantptr[DCTSIZE*6]); |
---|
4797 | |
---|
4798 | z1 = MULTIPLY(z2 + z3, FIX_0_541196100); |
---|
4799 | tmp2 = z1 + MULTIPLY(z2, FIX_0_765366865); |
---|
4800 | tmp3 = z1 - MULTIPLY(z3, FIX_1_847759065); |
---|
4801 | |
---|
4802 | z2 = DEQUANTIZE(inptr[DCTSIZE*0], quantptr[DCTSIZE*0]); |
---|
4803 | z3 = DEQUANTIZE(inptr[DCTSIZE*4], quantptr[DCTSIZE*4]); |
---|
4804 | z2 <<= CONST_BITS; |
---|
4805 | z3 <<= CONST_BITS; |
---|
4806 | /* Add fudge factor here for final descale. */ |
---|
4807 | z2 += ONE << (CONST_BITS-PASS1_BITS-1); |
---|
4808 | |
---|
4809 | tmp0 = z2 + z3; |
---|
4810 | tmp1 = z2 - z3; |
---|
4811 | |
---|
4812 | tmp10 = tmp0 + tmp2; |
---|
4813 | tmp13 = tmp0 - tmp2; |
---|
4814 | tmp11 = tmp1 + tmp3; |
---|
4815 | tmp12 = tmp1 - tmp3; |
---|
4816 | |
---|
4817 | /* Odd part per figure 8; the matrix is unitary and hence its |
---|
4818 | * transpose is its inverse. i0..i3 are y7,y5,y3,y1 respectively. |
---|
4819 | */ |
---|
4820 | |
---|
4821 | tmp0 = DEQUANTIZE(inptr[DCTSIZE*7], quantptr[DCTSIZE*7]); |
---|
4822 | tmp1 = DEQUANTIZE(inptr[DCTSIZE*5], quantptr[DCTSIZE*5]); |
---|
4823 | tmp2 = DEQUANTIZE(inptr[DCTSIZE*3], quantptr[DCTSIZE*3]); |
---|
4824 | tmp3 = DEQUANTIZE(inptr[DCTSIZE*1], quantptr[DCTSIZE*1]); |
---|
4825 | |
---|
4826 | z2 = tmp0 + tmp2; |
---|
4827 | z3 = tmp1 + tmp3; |
---|
4828 | |
---|
4829 | z1 = MULTIPLY(z2 + z3, FIX_1_175875602); /* sqrt(2) * c3 */ |
---|
4830 | z2 = MULTIPLY(z2, - FIX_1_961570560); /* sqrt(2) * (-c3-c5) */ |
---|
4831 | z3 = MULTIPLY(z3, - FIX_0_390180644); /* sqrt(2) * (c5-c3) */ |
---|
4832 | z2 += z1; |
---|
4833 | z3 += z1; |
---|
4834 | |
---|
4835 | z1 = MULTIPLY(tmp0 + tmp3, - FIX_0_899976223); /* sqrt(2) * (c7-c3) */ |
---|
4836 | tmp0 = MULTIPLY(tmp0, FIX_0_298631336); /* sqrt(2) * (-c1+c3+c5-c7) */ |
---|
4837 | tmp3 = MULTIPLY(tmp3, FIX_1_501321110); /* sqrt(2) * ( c1+c3-c5-c7) */ |
---|
4838 | tmp0 += z1 + z2; |
---|
4839 | tmp3 += z1 + z3; |
---|
4840 | |
---|
4841 | z1 = MULTIPLY(tmp1 + tmp2, - FIX_2_562915447); /* sqrt(2) * (-c1-c3) */ |
---|
4842 | tmp1 = MULTIPLY(tmp1, FIX_2_053119869); /* sqrt(2) * ( c1+c3-c5+c7) */ |
---|
4843 | tmp2 = MULTIPLY(tmp2, FIX_3_072711026); /* sqrt(2) * ( c1+c3+c5-c7) */ |
---|
4844 | tmp1 += z1 + z3; |
---|
4845 | tmp2 += z1 + z2; |
---|
4846 | |
---|
4847 | /* Final output stage: inputs are tmp10..tmp13, tmp0..tmp3 */ |
---|
4848 | |
---|
4849 | wsptr[4*0] = (int) RIGHT_SHIFT(tmp10 + tmp3, CONST_BITS-PASS1_BITS); |
---|
4850 | wsptr[4*7] = (int) RIGHT_SHIFT(tmp10 - tmp3, CONST_BITS-PASS1_BITS); |
---|
4851 | wsptr[4*1] = (int) RIGHT_SHIFT(tmp11 + tmp2, CONST_BITS-PASS1_BITS); |
---|
4852 | wsptr[4*6] = (int) RIGHT_SHIFT(tmp11 - tmp2, CONST_BITS-PASS1_BITS); |
---|
4853 | wsptr[4*2] = (int) RIGHT_SHIFT(tmp12 + tmp1, CONST_BITS-PASS1_BITS); |
---|
4854 | wsptr[4*5] = (int) RIGHT_SHIFT(tmp12 - tmp1, CONST_BITS-PASS1_BITS); |
---|
4855 | wsptr[4*3] = (int) RIGHT_SHIFT(tmp13 + tmp0, CONST_BITS-PASS1_BITS); |
---|
4856 | wsptr[4*4] = (int) RIGHT_SHIFT(tmp13 - tmp0, CONST_BITS-PASS1_BITS); |
---|
4857 | |
---|
4858 | inptr++; /* advance pointers to next column */ |
---|
4859 | quantptr++; |
---|
4860 | wsptr++; |
---|
4861 | } |
---|
4862 | |
---|
4863 | /* Pass 2: process 8 rows from work array, store into output array. |
---|
4864 | * 4-point IDCT kernel, cK represents sqrt(2) * cos(K*pi/16). |
---|
4865 | */ |
---|
4866 | wsptr = workspace; |
---|
4867 | for (ctr = 0; ctr < 8; ctr++) { |
---|
4868 | outptr = output_buf[ctr] + output_col; |
---|
4869 | |
---|
4870 | /* Even part */ |
---|
4871 | |
---|
4872 | /* Add fudge factor here for final descale. */ |
---|
4873 | tmp0 = (INT32) wsptr[0] + (ONE << (PASS1_BITS+2)); |
---|
4874 | tmp2 = (INT32) wsptr[2]; |
---|
4875 | |
---|
4876 | tmp10 = (tmp0 + tmp2) << CONST_BITS; |
---|
4877 | tmp12 = (tmp0 - tmp2) << CONST_BITS; |
---|
4878 | |
---|
4879 | /* Odd part */ |
---|
4880 | /* Same rotation as in the even part of the 8x8 LL&M IDCT */ |
---|
4881 | |
---|
4882 | z2 = (INT32) wsptr[1]; |
---|
4883 | z3 = (INT32) wsptr[3]; |
---|
4884 | |
---|
4885 | z1 = MULTIPLY(z2 + z3, FIX_0_541196100); /* c6 */ |
---|
4886 | tmp0 = z1 + MULTIPLY(z2, FIX_0_765366865); /* c2-c6 */ |
---|
4887 | tmp2 = z1 - MULTIPLY(z3, FIX_1_847759065); /* c2+c6 */ |
---|
4888 | |
---|
4889 | /* Final output stage */ |
---|
4890 | |
---|
4891 | outptr[0] = range_limit[(int) RIGHT_SHIFT(tmp10 + tmp0, |
---|
4892 | CONST_BITS+PASS1_BITS+3) |
---|
4893 | & RANGE_MASK]; |
---|
4894 | outptr[3] = range_limit[(int) RIGHT_SHIFT(tmp10 - tmp0, |
---|
4895 | CONST_BITS+PASS1_BITS+3) |
---|
4896 | & RANGE_MASK]; |
---|
4897 | outptr[1] = range_limit[(int) RIGHT_SHIFT(tmp12 + tmp2, |
---|
4898 | CONST_BITS+PASS1_BITS+3) |
---|
4899 | & RANGE_MASK]; |
---|
4900 | outptr[2] = range_limit[(int) RIGHT_SHIFT(tmp12 - tmp2, |
---|
4901 | CONST_BITS+PASS1_BITS+3) |
---|
4902 | & RANGE_MASK]; |
---|
4903 | |
---|
4904 | wsptr += 4; /* advance pointer to next row */ |
---|
4905 | } |
---|
4906 | } |
---|
4907 | |
---|
4908 | |
---|
4909 | /* |
---|
4910 | * Perform dequantization and inverse DCT on one block of coefficients, |
---|
4911 | * producing a reduced-size 3x6 output block. |
---|
4912 | * |
---|
4913 | * 6-point IDCT in pass 1 (columns), 3-point in pass 2 (rows). |
---|
4914 | */ |
---|
4915 | |
---|
4916 | GLOBAL(void) |
---|
4917 | jpeg_idct_3x6 (j_decompress_ptr cinfo, jpeg_component_info * compptr, |
---|
4918 | JCOEFPTR coef_block, |
---|
4919 | JSAMPARRAY output_buf, JDIMENSION output_col) |
---|
4920 | { |
---|
4921 | INT32 tmp0, tmp1, tmp2, tmp10, tmp11, tmp12; |
---|
4922 | INT32 z1, z2, z3; |
---|
4923 | JCOEFPTR inptr; |
---|
4924 | ISLOW_MULT_TYPE * quantptr; |
---|
4925 | int * wsptr; |
---|
4926 | JSAMPROW outptr; |
---|
4927 | JSAMPLE *range_limit = IDCT_range_limit(cinfo); |
---|
4928 | int ctr; |
---|
4929 | int workspace[3*6]; /* buffers data between passes */ |
---|
4930 | SHIFT_TEMPS |
---|
4931 | |
---|
4932 | /* Pass 1: process columns from input, store into work array. |
---|
4933 | * 6-point IDCT kernel, cK represents sqrt(2) * cos(K*pi/12). |
---|
4934 | */ |
---|
4935 | inptr = coef_block; |
---|
4936 | quantptr = (ISLOW_MULT_TYPE *) compptr->dct_table; |
---|
4937 | wsptr = workspace; |
---|
4938 | for (ctr = 0; ctr < 3; ctr++, inptr++, quantptr++, wsptr++) { |
---|
4939 | /* Even part */ |
---|
4940 | |
---|
4941 | tmp0 = DEQUANTIZE(inptr[DCTSIZE*0], quantptr[DCTSIZE*0]); |
---|
4942 | tmp0 <<= CONST_BITS; |
---|
4943 | /* Add fudge factor here for final descale. */ |
---|
4944 | tmp0 += ONE << (CONST_BITS-PASS1_BITS-1); |
---|
4945 | tmp2 = DEQUANTIZE(inptr[DCTSIZE*4], quantptr[DCTSIZE*4]); |
---|
4946 | tmp10 = MULTIPLY(tmp2, FIX(0.707106781)); /* c4 */ |
---|
4947 | tmp1 = tmp0 + tmp10; |
---|
4948 | tmp11 = RIGHT_SHIFT(tmp0 - tmp10 - tmp10, CONST_BITS-PASS1_BITS); |
---|
4949 | tmp10 = DEQUANTIZE(inptr[DCTSIZE*2], quantptr[DCTSIZE*2]); |
---|
4950 | tmp0 = MULTIPLY(tmp10, FIX(1.224744871)); /* c2 */ |
---|
4951 | tmp10 = tmp1 + tmp0; |
---|
4952 | tmp12 = tmp1 - tmp0; |
---|
4953 | |
---|
4954 | /* Odd part */ |
---|
4955 | |
---|
4956 | z1 = DEQUANTIZE(inptr[DCTSIZE*1], quantptr[DCTSIZE*1]); |
---|
4957 | z2 = DEQUANTIZE(inptr[DCTSIZE*3], quantptr[DCTSIZE*3]); |
---|
4958 | z3 = DEQUANTIZE(inptr[DCTSIZE*5], quantptr[DCTSIZE*5]); |
---|
4959 | tmp1 = MULTIPLY(z1 + z3, FIX(0.366025404)); /* c5 */ |
---|
4960 | tmp0 = tmp1 + ((z1 + z2) << CONST_BITS); |
---|
4961 | tmp2 = tmp1 + ((z3 - z2) << CONST_BITS); |
---|
4962 | tmp1 = (z1 - z2 - z3) << PASS1_BITS; |
---|
4963 | |
---|
4964 | /* Final output stage */ |
---|
4965 | |
---|
4966 | wsptr[3*0] = (int) RIGHT_SHIFT(tmp10 + tmp0, CONST_BITS-PASS1_BITS); |
---|
4967 | wsptr[3*5] = (int) RIGHT_SHIFT(tmp10 - tmp0, CONST_BITS-PASS1_BITS); |
---|
4968 | wsptr[3*1] = (int) (tmp11 + tmp1); |
---|
4969 | wsptr[3*4] = (int) (tmp11 - tmp1); |
---|
4970 | wsptr[3*2] = (int) RIGHT_SHIFT(tmp12 + tmp2, CONST_BITS-PASS1_BITS); |
---|
4971 | wsptr[3*3] = (int) RIGHT_SHIFT(tmp12 - tmp2, CONST_BITS-PASS1_BITS); |
---|
4972 | } |
---|
4973 | |
---|
4974 | /* Pass 2: process 6 rows from work array, store into output array. |
---|
4975 | * 3-point IDCT kernel, cK represents sqrt(2) * cos(K*pi/6). |
---|
4976 | */ |
---|
4977 | wsptr = workspace; |
---|
4978 | for (ctr = 0; ctr < 6; ctr++) { |
---|
4979 | outptr = output_buf[ctr] + output_col; |
---|
4980 | |
---|
4981 | /* Even part */ |
---|
4982 | |
---|
4983 | /* Add fudge factor here for final descale. */ |
---|
4984 | tmp0 = (INT32) wsptr[0] + (ONE << (PASS1_BITS+2)); |
---|
4985 | tmp0 <<= CONST_BITS; |
---|
4986 | tmp2 = (INT32) wsptr[2]; |
---|
4987 | tmp12 = MULTIPLY(tmp2, FIX(0.707106781)); /* c2 */ |
---|
4988 | tmp10 = tmp0 + tmp12; |
---|
4989 | tmp2 = tmp0 - tmp12 - tmp12; |
---|
4990 | |
---|
4991 | /* Odd part */ |
---|
4992 | |
---|
4993 | tmp12 = (INT32) wsptr[1]; |
---|
4994 | tmp0 = MULTIPLY(tmp12, FIX(1.224744871)); /* c1 */ |
---|
4995 | |
---|
4996 | /* Final output stage */ |
---|
4997 | |
---|
4998 | outptr[0] = range_limit[(int) RIGHT_SHIFT(tmp10 + tmp0, |
---|
4999 | CONST_BITS+PASS1_BITS+3) |
---|
5000 | & RANGE_MASK]; |
---|
5001 | outptr[2] = range_limit[(int) RIGHT_SHIFT(tmp10 - tmp0, |
---|
5002 | CONST_BITS+PASS1_BITS+3) |
---|
5003 | & RANGE_MASK]; |
---|
5004 | outptr[1] = range_limit[(int) RIGHT_SHIFT(tmp2, |
---|
5005 | CONST_BITS+PASS1_BITS+3) |
---|
5006 | & RANGE_MASK]; |
---|
5007 | |
---|
5008 | wsptr += 3; /* advance pointer to next row */ |
---|
5009 | } |
---|
5010 | } |
---|
5011 | |
---|
5012 | |
---|
5013 | /* |
---|
5014 | * Perform dequantization and inverse DCT on one block of coefficients, |
---|
5015 | * producing a 2x4 output block. |
---|
5016 | * |
---|
5017 | * 4-point IDCT in pass 1 (columns), 2-point in pass 2 (rows). |
---|
5018 | */ |
---|
5019 | |
---|
5020 | GLOBAL(void) |
---|
5021 | jpeg_idct_2x4 (j_decompress_ptr cinfo, jpeg_component_info * compptr, |
---|
5022 | JCOEFPTR coef_block, |
---|
5023 | JSAMPARRAY output_buf, JDIMENSION output_col) |
---|
5024 | { |
---|
5025 | INT32 tmp0, tmp2, tmp10, tmp12; |
---|
5026 | INT32 z1, z2, z3; |
---|
5027 | JCOEFPTR inptr; |
---|
5028 | ISLOW_MULT_TYPE * quantptr; |
---|
5029 | INT32 * wsptr; |
---|
5030 | JSAMPROW outptr; |
---|
5031 | JSAMPLE *range_limit = IDCT_range_limit(cinfo); |
---|
5032 | int ctr; |
---|
5033 | INT32 workspace[2*4]; /* buffers data between passes */ |
---|
5034 | SHIFT_TEMPS |
---|
5035 | |
---|
5036 | /* Pass 1: process columns from input, store into work array. |
---|
5037 | * 4-point IDCT kernel, |
---|
5038 | * cK represents sqrt(2) * cos(K*pi/16) [refers to 8-point IDCT]. |
---|
5039 | */ |
---|
5040 | inptr = coef_block; |
---|
5041 | quantptr = (ISLOW_MULT_TYPE *) compptr->dct_table; |
---|
5042 | wsptr = workspace; |
---|
5043 | for (ctr = 0; ctr < 2; ctr++, inptr++, quantptr++, wsptr++) { |
---|
5044 | /* Even part */ |
---|
5045 | |
---|
5046 | tmp0 = DEQUANTIZE(inptr[DCTSIZE*0], quantptr[DCTSIZE*0]); |
---|
5047 | tmp2 = DEQUANTIZE(inptr[DCTSIZE*2], quantptr[DCTSIZE*2]); |
---|
5048 | |
---|
5049 | tmp10 = (tmp0 + tmp2) << CONST_BITS; |
---|
5050 | tmp12 = (tmp0 - tmp2) << CONST_BITS; |
---|
5051 | |
---|
5052 | /* Odd part */ |
---|
5053 | /* Same rotation as in the even part of the 8x8 LL&M IDCT */ |
---|
5054 | |
---|
5055 | z2 = DEQUANTIZE(inptr[DCTSIZE*1], quantptr[DCTSIZE*1]); |
---|
5056 | z3 = DEQUANTIZE(inptr[DCTSIZE*3], quantptr[DCTSIZE*3]); |
---|
5057 | |
---|
5058 | z1 = MULTIPLY(z2 + z3, FIX_0_541196100); /* c6 */ |
---|
5059 | tmp0 = z1 + MULTIPLY(z2, FIX_0_765366865); /* c2-c6 */ |
---|
5060 | tmp2 = z1 - MULTIPLY(z3, FIX_1_847759065); /* c2+c6 */ |
---|
5061 | |
---|
5062 | /* Final output stage */ |
---|
5063 | |
---|
5064 | wsptr[2*0] = tmp10 + tmp0; |
---|
5065 | wsptr[2*3] = tmp10 - tmp0; |
---|
5066 | wsptr[2*1] = tmp12 + tmp2; |
---|
5067 | wsptr[2*2] = tmp12 - tmp2; |
---|
5068 | } |
---|
5069 | |
---|
5070 | /* Pass 2: process 4 rows from work array, store into output array. */ |
---|
5071 | |
---|
5072 | wsptr = workspace; |
---|
5073 | for (ctr = 0; ctr < 4; ctr++) { |
---|
5074 | outptr = output_buf[ctr] + output_col; |
---|
5075 | |
---|
5076 | /* Even part */ |
---|
5077 | |
---|
5078 | /* Add fudge factor here for final descale. */ |
---|
5079 | tmp10 = wsptr[0] + (ONE << (CONST_BITS+2)); |
---|
5080 | |
---|
5081 | /* Odd part */ |
---|
5082 | |
---|
5083 | tmp0 = wsptr[1]; |
---|
5084 | |
---|
5085 | /* Final output stage */ |
---|
5086 | |
---|
5087 | outptr[0] = range_limit[(int) RIGHT_SHIFT(tmp10 + tmp0, CONST_BITS+3) |
---|
5088 | & RANGE_MASK]; |
---|
5089 | outptr[1] = range_limit[(int) RIGHT_SHIFT(tmp10 - tmp0, CONST_BITS+3) |
---|
5090 | & RANGE_MASK]; |
---|
5091 | |
---|
5092 | wsptr += 2; /* advance pointer to next row */ |
---|
5093 | } |
---|
5094 | } |
---|
5095 | |
---|
5096 | |
---|
5097 | /* |
---|
5098 | * Perform dequantization and inverse DCT on one block of coefficients, |
---|
5099 | * producing a 1x2 output block. |
---|
5100 | * |
---|
5101 | * 2-point IDCT in pass 1 (columns), 1-point in pass 2 (rows). |
---|
5102 | */ |
---|
5103 | |
---|
5104 | GLOBAL(void) |
---|
5105 | jpeg_idct_1x2 (j_decompress_ptr cinfo, jpeg_component_info * compptr, |
---|
5106 | JCOEFPTR coef_block, |
---|
5107 | JSAMPARRAY output_buf, JDIMENSION output_col) |
---|
5108 | { |
---|
5109 | INT32 tmp0, tmp10; |
---|
5110 | ISLOW_MULT_TYPE * quantptr; |
---|
5111 | JSAMPLE *range_limit = IDCT_range_limit(cinfo); |
---|
5112 | SHIFT_TEMPS |
---|
5113 | |
---|
5114 | /* Process 1 column from input, store into output array. */ |
---|
5115 | |
---|
5116 | quantptr = (ISLOW_MULT_TYPE *) compptr->dct_table; |
---|
5117 | |
---|
5118 | /* Even part */ |
---|
5119 | |
---|
5120 | tmp10 = DEQUANTIZE(coef_block[DCTSIZE*0], quantptr[DCTSIZE*0]); |
---|
5121 | /* Add fudge factor here for final descale. */ |
---|
5122 | tmp10 += ONE << 2; |
---|
5123 | |
---|
5124 | /* Odd part */ |
---|
5125 | |
---|
5126 | tmp0 = DEQUANTIZE(coef_block[DCTSIZE*1], quantptr[DCTSIZE*1]); |
---|
5127 | |
---|
5128 | /* Final output stage */ |
---|
5129 | |
---|
5130 | output_buf[0][output_col] = range_limit[(int) RIGHT_SHIFT(tmp10 + tmp0, 3) |
---|
5131 | & RANGE_MASK]; |
---|
5132 | output_buf[1][output_col] = range_limit[(int) RIGHT_SHIFT(tmp10 - tmp0, 3) |
---|
5133 | & RANGE_MASK]; |
---|
5134 | } |
---|
5135 | |
---|
5136 | #endif /* IDCT_SCALING_SUPPORTED */ |
---|
5137 | #endif /* DCT_ISLOW_SUPPORTED */ |
---|