1 | /* |
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2 | * jfdctint.c |
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3 | * |
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4 | * Copyright (C) 1991-1996, Thomas G. Lane. |
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5 | * Modification developed 2003-2009 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 | * forward DCT (Discrete Cosine Transform). |
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11 | * |
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12 | * A 2-D DCT can be done by 1-D DCT on each row followed by 1-D DCT |
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13 | * on each column. Direct algorithms are also available, but they are |
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14 | * much more complex and seem not to be any faster when reduced to code. |
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15 | * |
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16 | * This implementation is based on an algorithm described in |
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17 | * C. Loeffler, A. Ligtenberg and G. Moschytz, "Practical Fast 1-D DCT |
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18 | * Algorithms with 11 Multiplications", Proc. Int'l. Conf. on Acoustics, |
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19 | * Speech, and Signal Processing 1989 (ICASSP '89), pp. 988-991. |
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20 | * The primary algorithm described there uses 11 multiplies and 29 adds. |
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21 | * We use their alternate method with 12 multiplies and 32 adds. |
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22 | * The advantage of this method is that no data path contains more than one |
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23 | * multiplication; this allows a very simple and accurate implementation in |
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24 | * scaled fixed-point arithmetic, with a minimal number of shifts. |
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25 | * |
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26 | * We also provide FDCT routines with various input sample block sizes for |
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27 | * direct resolution reduction or enlargement and for direct resolving the |
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28 | * common 2x1 and 1x2 subsampling cases without additional resampling: NxN |
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29 | * (N=1...16), 2NxN, and Nx2N (N=1...8) pixels for one 8x8 output DCT block. |
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30 | * |
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31 | * For N<8 we fill the remaining block coefficients with zero. |
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32 | * For N>8 we apply a partial N-point FDCT on the input samples, computing |
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33 | * just the lower 8 frequency coefficients and discarding the rest. |
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34 | * |
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35 | * We must scale the output coefficients of the N-point FDCT appropriately |
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36 | * to the standard 8-point FDCT level by 8/N per 1-D pass. This scaling |
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37 | * is folded into the constant multipliers (pass 2) and/or final/initial |
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38 | * shifting. |
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39 | * |
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40 | * CAUTION: We rely on the FIX() macro except for the N=1,2,4,8 cases |
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41 | * since there would be too many additional constants to pre-calculate. |
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42 | */ |
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43 | |
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44 | #define JPEG_INTERNALS |
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45 | #include "jinclude.h" |
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46 | #include "jpeglib.h" |
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47 | #include "jdct.h" /* Private declarations for DCT subsystem */ |
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48 | |
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49 | #ifdef DCT_ISLOW_SUPPORTED |
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50 | |
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51 | |
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52 | /* |
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53 | * This module is specialized to the case DCTSIZE = 8. |
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54 | */ |
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55 | |
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56 | #if DCTSIZE != 8 |
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57 | Sorry, this code only copes with 8x8 DCT blocks. /* deliberate syntax err */ |
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58 | #endif |
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59 | |
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60 | |
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61 | /* |
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62 | * The poop on this scaling stuff is as follows: |
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63 | * |
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64 | * Each 1-D DCT step produces outputs which are a factor of sqrt(N) |
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65 | * larger than the true DCT outputs. The final outputs are therefore |
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66 | * a factor of N larger than desired; since N=8 this can be cured by |
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67 | * a simple right shift at the end of the algorithm. The advantage of |
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68 | * this arrangement is that we save two multiplications per 1-D DCT, |
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69 | * because the y0 and y4 outputs need not be divided by sqrt(N). |
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70 | * In the IJG code, this factor of 8 is removed by the quantization step |
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71 | * (in jcdctmgr.c), NOT in this module. |
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72 | * |
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73 | * We have to do addition and subtraction of the integer inputs, which |
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74 | * is no problem, and multiplication by fractional constants, which is |
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75 | * a problem to do in integer arithmetic. We multiply all the constants |
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76 | * by CONST_SCALE and convert them to integer constants (thus retaining |
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77 | * CONST_BITS bits of precision in the constants). After doing a |
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78 | * multiplication we have to divide the product by CONST_SCALE, with proper |
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79 | * rounding, to produce the correct output. This division can be done |
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80 | * cheaply as a right shift of CONST_BITS bits. We postpone shifting |
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81 | * as long as possible so that partial sums can be added together with |
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82 | * full fractional precision. |
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83 | * |
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84 | * The outputs of the first pass are scaled up by PASS1_BITS bits so that |
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85 | * they are represented to better-than-integral precision. These outputs |
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86 | * require BITS_IN_JSAMPLE + PASS1_BITS + 3 bits; this fits in a 16-bit word |
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87 | * with the recommended scaling. (For 12-bit sample data, the intermediate |
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88 | * array is INT32 anyway.) |
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89 | * |
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90 | * To avoid overflow of the 32-bit intermediate results in pass 2, we must |
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91 | * have BITS_IN_JSAMPLE + CONST_BITS + PASS1_BITS <= 26. Error analysis |
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92 | * shows that the values given below are the most effective. |
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93 | */ |
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94 | |
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95 | #if BITS_IN_JSAMPLE == 8 |
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96 | #define CONST_BITS 13 |
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97 | #define PASS1_BITS 2 |
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98 | #else |
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99 | #define CONST_BITS 13 |
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100 | #define PASS1_BITS 1 /* lose a little precision to avoid overflow */ |
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101 | #endif |
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102 | |
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103 | /* Some C compilers fail to reduce "FIX(constant)" at compile time, thus |
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104 | * causing a lot of useless floating-point operations at run time. |
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105 | * To get around this we use the following pre-calculated constants. |
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106 | * If you change CONST_BITS you may want to add appropriate values. |
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107 | * (With a reasonable C compiler, you can just rely on the FIX() macro...) |
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108 | */ |
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109 | |
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110 | #if CONST_BITS == 13 |
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111 | #define FIX_0_298631336 ((INT32) 2446) /* FIX(0.298631336) */ |
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112 | #define FIX_0_390180644 ((INT32) 3196) /* FIX(0.390180644) */ |
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113 | #define FIX_0_541196100 ((INT32) 4433) /* FIX(0.541196100) */ |
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114 | #define FIX_0_765366865 ((INT32) 6270) /* FIX(0.765366865) */ |
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115 | #define FIX_0_899976223 ((INT32) 7373) /* FIX(0.899976223) */ |
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116 | #define FIX_1_175875602 ((INT32) 9633) /* FIX(1.175875602) */ |
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117 | #define FIX_1_501321110 ((INT32) 12299) /* FIX(1.501321110) */ |
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118 | #define FIX_1_847759065 ((INT32) 15137) /* FIX(1.847759065) */ |
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119 | #define FIX_1_961570560 ((INT32) 16069) /* FIX(1.961570560) */ |
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120 | #define FIX_2_053119869 ((INT32) 16819) /* FIX(2.053119869) */ |
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121 | #define FIX_2_562915447 ((INT32) 20995) /* FIX(2.562915447) */ |
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122 | #define FIX_3_072711026 ((INT32) 25172) /* FIX(3.072711026) */ |
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123 | #else |
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124 | #define FIX_0_298631336 FIX(0.298631336) |
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125 | #define FIX_0_390180644 FIX(0.390180644) |
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126 | #define FIX_0_541196100 FIX(0.541196100) |
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127 | #define FIX_0_765366865 FIX(0.765366865) |
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128 | #define FIX_0_899976223 FIX(0.899976223) |
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129 | #define FIX_1_175875602 FIX(1.175875602) |
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130 | #define FIX_1_501321110 FIX(1.501321110) |
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131 | #define FIX_1_847759065 FIX(1.847759065) |
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132 | #define FIX_1_961570560 FIX(1.961570560) |
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133 | #define FIX_2_053119869 FIX(2.053119869) |
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134 | #define FIX_2_562915447 FIX(2.562915447) |
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135 | #define FIX_3_072711026 FIX(3.072711026) |
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136 | #endif |
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137 | |
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138 | |
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139 | /* Multiply an INT32 variable by an INT32 constant to yield an INT32 result. |
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140 | * For 8-bit samples with the recommended scaling, all the variable |
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141 | * and constant values involved are no more than 16 bits wide, so a |
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142 | * 16x16->32 bit multiply can be used instead of a full 32x32 multiply. |
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143 | * For 12-bit samples, a full 32-bit multiplication will be needed. |
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144 | */ |
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145 | |
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146 | #if BITS_IN_JSAMPLE == 8 |
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147 | #define MULTIPLY(var,const) MULTIPLY16C16(var,const) |
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148 | #else |
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149 | #define MULTIPLY(var,const) ((var) * (const)) |
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150 | #endif |
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151 | |
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152 | |
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153 | /* |
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154 | * Perform the forward DCT on one block of samples. |
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155 | */ |
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156 | |
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157 | GLOBAL(void) |
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158 | jpeg_fdct_islow (DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col) |
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159 | { |
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160 | INT32 tmp0, tmp1, tmp2, tmp3; |
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161 | INT32 tmp10, tmp11, tmp12, tmp13; |
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162 | INT32 z1; |
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163 | DCTELEM *dataptr; |
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164 | JSAMPROW elemptr; |
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165 | int ctr; |
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166 | SHIFT_TEMPS |
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167 | |
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168 | /* Pass 1: process rows. */ |
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169 | /* Note results are scaled up by sqrt(8) compared to a true DCT; */ |
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170 | /* furthermore, we scale the results by 2**PASS1_BITS. */ |
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171 | |
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172 | dataptr = data; |
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173 | for (ctr = 0; ctr < DCTSIZE; ctr++) { |
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174 | elemptr = sample_data[ctr] + start_col; |
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175 | |
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176 | /* Even part per LL&M figure 1 --- note that published figure is faulty; |
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177 | * rotator "sqrt(2)*c1" should be "sqrt(2)*c6". |
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178 | */ |
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179 | |
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180 | tmp0 = GETJSAMPLE(elemptr[0]) + GETJSAMPLE(elemptr[7]); |
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181 | tmp1 = GETJSAMPLE(elemptr[1]) + GETJSAMPLE(elemptr[6]); |
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182 | tmp2 = GETJSAMPLE(elemptr[2]) + GETJSAMPLE(elemptr[5]); |
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183 | tmp3 = GETJSAMPLE(elemptr[3]) + GETJSAMPLE(elemptr[4]); |
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184 | |
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185 | tmp10 = tmp0 + tmp3; |
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186 | tmp12 = tmp0 - tmp3; |
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187 | tmp11 = tmp1 + tmp2; |
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188 | tmp13 = tmp1 - tmp2; |
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189 | |
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190 | tmp0 = GETJSAMPLE(elemptr[0]) - GETJSAMPLE(elemptr[7]); |
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191 | tmp1 = GETJSAMPLE(elemptr[1]) - GETJSAMPLE(elemptr[6]); |
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192 | tmp2 = GETJSAMPLE(elemptr[2]) - GETJSAMPLE(elemptr[5]); |
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193 | tmp3 = GETJSAMPLE(elemptr[3]) - GETJSAMPLE(elemptr[4]); |
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194 | |
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195 | /* Apply unsigned->signed conversion */ |
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196 | dataptr[0] = (DCTELEM) ((tmp10 + tmp11 - 8 * CENTERJSAMPLE) << PASS1_BITS); |
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197 | dataptr[4] = (DCTELEM) ((tmp10 - tmp11) << PASS1_BITS); |
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198 | |
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199 | z1 = MULTIPLY(tmp12 + tmp13, FIX_0_541196100); |
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200 | /* Add fudge factor here for final descale. */ |
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201 | z1 += ONE << (CONST_BITS-PASS1_BITS-1); |
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202 | dataptr[2] = (DCTELEM) RIGHT_SHIFT(z1 + MULTIPLY(tmp12, FIX_0_765366865), |
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203 | CONST_BITS-PASS1_BITS); |
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204 | dataptr[6] = (DCTELEM) RIGHT_SHIFT(z1 - MULTIPLY(tmp13, FIX_1_847759065), |
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205 | CONST_BITS-PASS1_BITS); |
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206 | |
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207 | /* Odd part per figure 8 --- note paper omits factor of sqrt(2). |
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208 | * cK represents sqrt(2) * cos(K*pi/16). |
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209 | * i0..i3 in the paper are tmp0..tmp3 here. |
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210 | */ |
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211 | |
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212 | tmp10 = tmp0 + tmp3; |
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213 | tmp11 = tmp1 + tmp2; |
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214 | tmp12 = tmp0 + tmp2; |
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215 | tmp13 = tmp1 + tmp3; |
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216 | z1 = MULTIPLY(tmp12 + tmp13, FIX_1_175875602); /* c3 */ |
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217 | /* Add fudge factor here for final descale. */ |
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218 | z1 += ONE << (CONST_BITS-PASS1_BITS-1); |
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219 | |
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220 | tmp0 = MULTIPLY(tmp0, FIX_1_501321110); /* c1+c3-c5-c7 */ |
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221 | tmp1 = MULTIPLY(tmp1, FIX_3_072711026); /* c1+c3+c5-c7 */ |
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222 | tmp2 = MULTIPLY(tmp2, FIX_2_053119869); /* c1+c3-c5+c7 */ |
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223 | tmp3 = MULTIPLY(tmp3, FIX_0_298631336); /* -c1+c3+c5-c7 */ |
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224 | tmp10 = MULTIPLY(tmp10, - FIX_0_899976223); /* c7-c3 */ |
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225 | tmp11 = MULTIPLY(tmp11, - FIX_2_562915447); /* -c1-c3 */ |
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226 | tmp12 = MULTIPLY(tmp12, - FIX_0_390180644); /* c5-c3 */ |
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227 | tmp13 = MULTIPLY(tmp13, - FIX_1_961570560); /* -c3-c5 */ |
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228 | |
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229 | tmp12 += z1; |
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230 | tmp13 += z1; |
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231 | |
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232 | dataptr[1] = (DCTELEM) |
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233 | RIGHT_SHIFT(tmp0 + tmp10 + tmp12, CONST_BITS-PASS1_BITS); |
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234 | dataptr[3] = (DCTELEM) |
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235 | RIGHT_SHIFT(tmp1 + tmp11 + tmp13, CONST_BITS-PASS1_BITS); |
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236 | dataptr[5] = (DCTELEM) |
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237 | RIGHT_SHIFT(tmp2 + tmp11 + tmp12, CONST_BITS-PASS1_BITS); |
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238 | dataptr[7] = (DCTELEM) |
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239 | RIGHT_SHIFT(tmp3 + tmp10 + tmp13, CONST_BITS-PASS1_BITS); |
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240 | |
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241 | dataptr += DCTSIZE; /* advance pointer to next row */ |
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242 | } |
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243 | |
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244 | /* Pass 2: process columns. |
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245 | * We remove the PASS1_BITS scaling, but leave the results scaled up |
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246 | * by an overall factor of 8. |
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247 | */ |
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248 | |
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249 | dataptr = data; |
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250 | for (ctr = DCTSIZE-1; ctr >= 0; ctr--) { |
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251 | /* Even part per LL&M figure 1 --- note that published figure is faulty; |
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252 | * rotator "sqrt(2)*c1" should be "sqrt(2)*c6". |
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253 | */ |
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254 | |
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255 | tmp0 = dataptr[DCTSIZE*0] + dataptr[DCTSIZE*7]; |
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256 | tmp1 = dataptr[DCTSIZE*1] + dataptr[DCTSIZE*6]; |
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257 | tmp2 = dataptr[DCTSIZE*2] + dataptr[DCTSIZE*5]; |
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258 | tmp3 = dataptr[DCTSIZE*3] + dataptr[DCTSIZE*4]; |
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259 | |
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260 | /* Add fudge factor here for final descale. */ |
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261 | tmp10 = tmp0 + tmp3 + (ONE << (PASS1_BITS-1)); |
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262 | tmp12 = tmp0 - tmp3; |
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263 | tmp11 = tmp1 + tmp2; |
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264 | tmp13 = tmp1 - tmp2; |
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265 | |
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266 | tmp0 = dataptr[DCTSIZE*0] - dataptr[DCTSIZE*7]; |
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267 | tmp1 = dataptr[DCTSIZE*1] - dataptr[DCTSIZE*6]; |
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268 | tmp2 = dataptr[DCTSIZE*2] - dataptr[DCTSIZE*5]; |
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269 | tmp3 = dataptr[DCTSIZE*3] - dataptr[DCTSIZE*4]; |
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270 | |
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271 | dataptr[DCTSIZE*0] = (DCTELEM) RIGHT_SHIFT(tmp10 + tmp11, PASS1_BITS); |
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272 | dataptr[DCTSIZE*4] = (DCTELEM) RIGHT_SHIFT(tmp10 - tmp11, PASS1_BITS); |
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273 | |
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274 | z1 = MULTIPLY(tmp12 + tmp13, FIX_0_541196100); |
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275 | /* Add fudge factor here for final descale. */ |
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276 | z1 += ONE << (CONST_BITS+PASS1_BITS-1); |
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277 | dataptr[DCTSIZE*2] = (DCTELEM) |
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278 | RIGHT_SHIFT(z1 + MULTIPLY(tmp12, FIX_0_765366865), CONST_BITS+PASS1_BITS); |
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279 | dataptr[DCTSIZE*6] = (DCTELEM) |
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280 | RIGHT_SHIFT(z1 - MULTIPLY(tmp13, FIX_1_847759065), CONST_BITS+PASS1_BITS); |
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281 | |
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282 | /* Odd part per figure 8 --- note paper omits factor of sqrt(2). |
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283 | * cK represents sqrt(2) * cos(K*pi/16). |
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284 | * i0..i3 in the paper are tmp0..tmp3 here. |
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285 | */ |
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286 | |
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287 | tmp10 = tmp0 + tmp3; |
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288 | tmp11 = tmp1 + tmp2; |
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289 | tmp12 = tmp0 + tmp2; |
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290 | tmp13 = tmp1 + tmp3; |
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291 | z1 = MULTIPLY(tmp12 + tmp13, FIX_1_175875602); /* c3 */ |
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292 | /* Add fudge factor here for final descale. */ |
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293 | z1 += ONE << (CONST_BITS+PASS1_BITS-1); |
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294 | |
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295 | tmp0 = MULTIPLY(tmp0, FIX_1_501321110); /* c1+c3-c5-c7 */ |
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296 | tmp1 = MULTIPLY(tmp1, FIX_3_072711026); /* c1+c3+c5-c7 */ |
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297 | tmp2 = MULTIPLY(tmp2, FIX_2_053119869); /* c1+c3-c5+c7 */ |
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298 | tmp3 = MULTIPLY(tmp3, FIX_0_298631336); /* -c1+c3+c5-c7 */ |
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299 | tmp10 = MULTIPLY(tmp10, - FIX_0_899976223); /* c7-c3 */ |
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300 | tmp11 = MULTIPLY(tmp11, - FIX_2_562915447); /* -c1-c3 */ |
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301 | tmp12 = MULTIPLY(tmp12, - FIX_0_390180644); /* c5-c3 */ |
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302 | tmp13 = MULTIPLY(tmp13, - FIX_1_961570560); /* -c3-c5 */ |
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303 | |
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304 | tmp12 += z1; |
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305 | tmp13 += z1; |
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306 | |
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307 | dataptr[DCTSIZE*1] = (DCTELEM) |
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308 | RIGHT_SHIFT(tmp0 + tmp10 + tmp12, CONST_BITS+PASS1_BITS); |
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309 | dataptr[DCTSIZE*3] = (DCTELEM) |
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310 | RIGHT_SHIFT(tmp1 + tmp11 + tmp13, CONST_BITS+PASS1_BITS); |
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311 | dataptr[DCTSIZE*5] = (DCTELEM) |
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312 | RIGHT_SHIFT(tmp2 + tmp11 + tmp12, CONST_BITS+PASS1_BITS); |
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313 | dataptr[DCTSIZE*7] = (DCTELEM) |
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314 | RIGHT_SHIFT(tmp3 + tmp10 + tmp13, CONST_BITS+PASS1_BITS); |
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315 | |
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316 | dataptr++; /* advance pointer to next column */ |
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317 | } |
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318 | } |
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319 | |
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320 | #ifdef DCT_SCALING_SUPPORTED |
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321 | |
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322 | |
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323 | /* |
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324 | * Perform the forward DCT on a 7x7 sample block. |
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325 | */ |
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326 | |
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327 | GLOBAL(void) |
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328 | jpeg_fdct_7x7 (DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col) |
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329 | { |
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330 | INT32 tmp0, tmp1, tmp2, tmp3; |
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331 | INT32 tmp10, tmp11, tmp12; |
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332 | INT32 z1, z2, z3; |
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333 | DCTELEM *dataptr; |
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334 | JSAMPROW elemptr; |
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335 | int ctr; |
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336 | SHIFT_TEMPS |
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337 | |
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338 | /* Pre-zero output coefficient block. */ |
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339 | MEMZERO(data, SIZEOF(DCTELEM) * DCTSIZE2); |
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340 | |
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341 | /* Pass 1: process rows. */ |
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342 | /* Note results are scaled up by sqrt(8) compared to a true DCT; */ |
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343 | /* furthermore, we scale the results by 2**PASS1_BITS. */ |
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344 | /* cK represents sqrt(2) * cos(K*pi/14). */ |
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345 | |
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346 | dataptr = data; |
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347 | for (ctr = 0; ctr < 7; ctr++) { |
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348 | elemptr = sample_data[ctr] + start_col; |
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349 | |
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350 | /* Even part */ |
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351 | |
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352 | tmp0 = GETJSAMPLE(elemptr[0]) + GETJSAMPLE(elemptr[6]); |
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353 | tmp1 = GETJSAMPLE(elemptr[1]) + GETJSAMPLE(elemptr[5]); |
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354 | tmp2 = GETJSAMPLE(elemptr[2]) + GETJSAMPLE(elemptr[4]); |
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355 | tmp3 = GETJSAMPLE(elemptr[3]); |
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356 | |
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357 | tmp10 = GETJSAMPLE(elemptr[0]) - GETJSAMPLE(elemptr[6]); |
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358 | tmp11 = GETJSAMPLE(elemptr[1]) - GETJSAMPLE(elemptr[5]); |
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359 | tmp12 = GETJSAMPLE(elemptr[2]) - GETJSAMPLE(elemptr[4]); |
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360 | |
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361 | z1 = tmp0 + tmp2; |
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362 | /* Apply unsigned->signed conversion */ |
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363 | dataptr[0] = (DCTELEM) |
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364 | ((z1 + tmp1 + tmp3 - 7 * CENTERJSAMPLE) << PASS1_BITS); |
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365 | tmp3 += tmp3; |
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366 | z1 -= tmp3; |
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367 | z1 -= tmp3; |
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368 | z1 = MULTIPLY(z1, FIX(0.353553391)); /* (c2+c6-c4)/2 */ |
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369 | z2 = MULTIPLY(tmp0 - tmp2, FIX(0.920609002)); /* (c2+c4-c6)/2 */ |
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370 | z3 = MULTIPLY(tmp1 - tmp2, FIX(0.314692123)); /* c6 */ |
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371 | dataptr[2] = (DCTELEM) DESCALE(z1 + z2 + z3, CONST_BITS-PASS1_BITS); |
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372 | z1 -= z2; |
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373 | z2 = MULTIPLY(tmp0 - tmp1, FIX(0.881747734)); /* c4 */ |
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374 | dataptr[4] = (DCTELEM) |
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375 | DESCALE(z2 + z3 - MULTIPLY(tmp1 - tmp3, FIX(0.707106781)), /* c2+c6-c4 */ |
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376 | CONST_BITS-PASS1_BITS); |
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377 | dataptr[6] = (DCTELEM) DESCALE(z1 + z2, CONST_BITS-PASS1_BITS); |
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378 | |
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379 | /* Odd part */ |
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380 | |
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381 | tmp1 = MULTIPLY(tmp10 + tmp11, FIX(0.935414347)); /* (c3+c1-c5)/2 */ |
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382 | tmp2 = MULTIPLY(tmp10 - tmp11, FIX(0.170262339)); /* (c3+c5-c1)/2 */ |
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383 | tmp0 = tmp1 - tmp2; |
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384 | tmp1 += tmp2; |
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385 | tmp2 = MULTIPLY(tmp11 + tmp12, - FIX(1.378756276)); /* -c1 */ |
---|
386 | tmp1 += tmp2; |
---|
387 | tmp3 = MULTIPLY(tmp10 + tmp12, FIX(0.613604268)); /* c5 */ |
---|
388 | tmp0 += tmp3; |
---|
389 | tmp2 += tmp3 + MULTIPLY(tmp12, FIX(1.870828693)); /* c3+c1-c5 */ |
---|
390 | |
---|
391 | dataptr[1] = (DCTELEM) DESCALE(tmp0, CONST_BITS-PASS1_BITS); |
---|
392 | dataptr[3] = (DCTELEM) DESCALE(tmp1, CONST_BITS-PASS1_BITS); |
---|
393 | dataptr[5] = (DCTELEM) DESCALE(tmp2, CONST_BITS-PASS1_BITS); |
---|
394 | |
---|
395 | dataptr += DCTSIZE; /* advance pointer to next row */ |
---|
396 | } |
---|
397 | |
---|
398 | /* Pass 2: process columns. |
---|
399 | * We remove the PASS1_BITS scaling, but leave the results scaled up |
---|
400 | * by an overall factor of 8. |
---|
401 | * We must also scale the output by (8/7)**2 = 64/49, which we fold |
---|
402 | * into the constant multipliers: |
---|
403 | * cK now represents sqrt(2) * cos(K*pi/14) * 64/49. |
---|
404 | */ |
---|
405 | |
---|
406 | dataptr = data; |
---|
407 | for (ctr = 0; ctr < 7; ctr++) { |
---|
408 | /* Even part */ |
---|
409 | |
---|
410 | tmp0 = dataptr[DCTSIZE*0] + dataptr[DCTSIZE*6]; |
---|
411 | tmp1 = dataptr[DCTSIZE*1] + dataptr[DCTSIZE*5]; |
---|
412 | tmp2 = dataptr[DCTSIZE*2] + dataptr[DCTSIZE*4]; |
---|
413 | tmp3 = dataptr[DCTSIZE*3]; |
---|
414 | |
---|
415 | tmp10 = dataptr[DCTSIZE*0] - dataptr[DCTSIZE*6]; |
---|
416 | tmp11 = dataptr[DCTSIZE*1] - dataptr[DCTSIZE*5]; |
---|
417 | tmp12 = dataptr[DCTSIZE*2] - dataptr[DCTSIZE*4]; |
---|
418 | |
---|
419 | z1 = tmp0 + tmp2; |
---|
420 | dataptr[DCTSIZE*0] = (DCTELEM) |
---|
421 | DESCALE(MULTIPLY(z1 + tmp1 + tmp3, FIX(1.306122449)), /* 64/49 */ |
---|
422 | CONST_BITS+PASS1_BITS); |
---|
423 | tmp3 += tmp3; |
---|
424 | z1 -= tmp3; |
---|
425 | z1 -= tmp3; |
---|
426 | z1 = MULTIPLY(z1, FIX(0.461784020)); /* (c2+c6-c4)/2 */ |
---|
427 | z2 = MULTIPLY(tmp0 - tmp2, FIX(1.202428084)); /* (c2+c4-c6)/2 */ |
---|
428 | z3 = MULTIPLY(tmp1 - tmp2, FIX(0.411026446)); /* c6 */ |
---|
429 | dataptr[DCTSIZE*2] = (DCTELEM) DESCALE(z1 + z2 + z3, CONST_BITS+PASS1_BITS); |
---|
430 | z1 -= z2; |
---|
431 | z2 = MULTIPLY(tmp0 - tmp1, FIX(1.151670509)); /* c4 */ |
---|
432 | dataptr[DCTSIZE*4] = (DCTELEM) |
---|
433 | DESCALE(z2 + z3 - MULTIPLY(tmp1 - tmp3, FIX(0.923568041)), /* c2+c6-c4 */ |
---|
434 | CONST_BITS+PASS1_BITS); |
---|
435 | dataptr[DCTSIZE*6] = (DCTELEM) DESCALE(z1 + z2, CONST_BITS+PASS1_BITS); |
---|
436 | |
---|
437 | /* Odd part */ |
---|
438 | |
---|
439 | tmp1 = MULTIPLY(tmp10 + tmp11, FIX(1.221765677)); /* (c3+c1-c5)/2 */ |
---|
440 | tmp2 = MULTIPLY(tmp10 - tmp11, FIX(0.222383464)); /* (c3+c5-c1)/2 */ |
---|
441 | tmp0 = tmp1 - tmp2; |
---|
442 | tmp1 += tmp2; |
---|
443 | tmp2 = MULTIPLY(tmp11 + tmp12, - FIX(1.800824523)); /* -c1 */ |
---|
444 | tmp1 += tmp2; |
---|
445 | tmp3 = MULTIPLY(tmp10 + tmp12, FIX(0.801442310)); /* c5 */ |
---|
446 | tmp0 += tmp3; |
---|
447 | tmp2 += tmp3 + MULTIPLY(tmp12, FIX(2.443531355)); /* c3+c1-c5 */ |
---|
448 | |
---|
449 | dataptr[DCTSIZE*1] = (DCTELEM) DESCALE(tmp0, CONST_BITS+PASS1_BITS); |
---|
450 | dataptr[DCTSIZE*3] = (DCTELEM) DESCALE(tmp1, CONST_BITS+PASS1_BITS); |
---|
451 | dataptr[DCTSIZE*5] = (DCTELEM) DESCALE(tmp2, CONST_BITS+PASS1_BITS); |
---|
452 | |
---|
453 | dataptr++; /* advance pointer to next column */ |
---|
454 | } |
---|
455 | } |
---|
456 | |
---|
457 | |
---|
458 | /* |
---|
459 | * Perform the forward DCT on a 6x6 sample block. |
---|
460 | */ |
---|
461 | |
---|
462 | GLOBAL(void) |
---|
463 | jpeg_fdct_6x6 (DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col) |
---|
464 | { |
---|
465 | INT32 tmp0, tmp1, tmp2; |
---|
466 | INT32 tmp10, tmp11, tmp12; |
---|
467 | DCTELEM *dataptr; |
---|
468 | JSAMPROW elemptr; |
---|
469 | int ctr; |
---|
470 | SHIFT_TEMPS |
---|
471 | |
---|
472 | /* Pre-zero output coefficient block. */ |
---|
473 | MEMZERO(data, SIZEOF(DCTELEM) * DCTSIZE2); |
---|
474 | |
---|
475 | /* Pass 1: process rows. */ |
---|
476 | /* Note results are scaled up by sqrt(8) compared to a true DCT; */ |
---|
477 | /* furthermore, we scale the results by 2**PASS1_BITS. */ |
---|
478 | /* cK represents sqrt(2) * cos(K*pi/12). */ |
---|
479 | |
---|
480 | dataptr = data; |
---|
481 | for (ctr = 0; ctr < 6; ctr++) { |
---|
482 | elemptr = sample_data[ctr] + start_col; |
---|
483 | |
---|
484 | /* Even part */ |
---|
485 | |
---|
486 | tmp0 = GETJSAMPLE(elemptr[0]) + GETJSAMPLE(elemptr[5]); |
---|
487 | tmp11 = GETJSAMPLE(elemptr[1]) + GETJSAMPLE(elemptr[4]); |
---|
488 | tmp2 = GETJSAMPLE(elemptr[2]) + GETJSAMPLE(elemptr[3]); |
---|
489 | |
---|
490 | tmp10 = tmp0 + tmp2; |
---|
491 | tmp12 = tmp0 - tmp2; |
---|
492 | |
---|
493 | tmp0 = GETJSAMPLE(elemptr[0]) - GETJSAMPLE(elemptr[5]); |
---|
494 | tmp1 = GETJSAMPLE(elemptr[1]) - GETJSAMPLE(elemptr[4]); |
---|
495 | tmp2 = GETJSAMPLE(elemptr[2]) - GETJSAMPLE(elemptr[3]); |
---|
496 | |
---|
497 | /* Apply unsigned->signed conversion */ |
---|
498 | dataptr[0] = (DCTELEM) |
---|
499 | ((tmp10 + tmp11 - 6 * CENTERJSAMPLE) << PASS1_BITS); |
---|
500 | dataptr[2] = (DCTELEM) |
---|
501 | DESCALE(MULTIPLY(tmp12, FIX(1.224744871)), /* c2 */ |
---|
502 | CONST_BITS-PASS1_BITS); |
---|
503 | dataptr[4] = (DCTELEM) |
---|
504 | DESCALE(MULTIPLY(tmp10 - tmp11 - tmp11, FIX(0.707106781)), /* c4 */ |
---|
505 | CONST_BITS-PASS1_BITS); |
---|
506 | |
---|
507 | /* Odd part */ |
---|
508 | |
---|
509 | tmp10 = DESCALE(MULTIPLY(tmp0 + tmp2, FIX(0.366025404)), /* c5 */ |
---|
510 | CONST_BITS-PASS1_BITS); |
---|
511 | |
---|
512 | dataptr[1] = (DCTELEM) (tmp10 + ((tmp0 + tmp1) << PASS1_BITS)); |
---|
513 | dataptr[3] = (DCTELEM) ((tmp0 - tmp1 - tmp2) << PASS1_BITS); |
---|
514 | dataptr[5] = (DCTELEM) (tmp10 + ((tmp2 - tmp1) << PASS1_BITS)); |
---|
515 | |
---|
516 | dataptr += DCTSIZE; /* advance pointer to next row */ |
---|
517 | } |
---|
518 | |
---|
519 | /* Pass 2: process columns. |
---|
520 | * We remove the PASS1_BITS scaling, but leave the results scaled up |
---|
521 | * by an overall factor of 8. |
---|
522 | * We must also scale the output by (8/6)**2 = 16/9, which we fold |
---|
523 | * into the constant multipliers: |
---|
524 | * cK now represents sqrt(2) * cos(K*pi/12) * 16/9. |
---|
525 | */ |
---|
526 | |
---|
527 | dataptr = data; |
---|
528 | for (ctr = 0; ctr < 6; ctr++) { |
---|
529 | /* Even part */ |
---|
530 | |
---|
531 | tmp0 = dataptr[DCTSIZE*0] + dataptr[DCTSIZE*5]; |
---|
532 | tmp11 = dataptr[DCTSIZE*1] + dataptr[DCTSIZE*4]; |
---|
533 | tmp2 = dataptr[DCTSIZE*2] + dataptr[DCTSIZE*3]; |
---|
534 | |
---|
535 | tmp10 = tmp0 + tmp2; |
---|
536 | tmp12 = tmp0 - tmp2; |
---|
537 | |
---|
538 | tmp0 = dataptr[DCTSIZE*0] - dataptr[DCTSIZE*5]; |
---|
539 | tmp1 = dataptr[DCTSIZE*1] - dataptr[DCTSIZE*4]; |
---|
540 | tmp2 = dataptr[DCTSIZE*2] - dataptr[DCTSIZE*3]; |
---|
541 | |
---|
542 | dataptr[DCTSIZE*0] = (DCTELEM) |
---|
543 | DESCALE(MULTIPLY(tmp10 + tmp11, FIX(1.777777778)), /* 16/9 */ |
---|
544 | CONST_BITS+PASS1_BITS); |
---|
545 | dataptr[DCTSIZE*2] = (DCTELEM) |
---|
546 | DESCALE(MULTIPLY(tmp12, FIX(2.177324216)), /* c2 */ |
---|
547 | CONST_BITS+PASS1_BITS); |
---|
548 | dataptr[DCTSIZE*4] = (DCTELEM) |
---|
549 | DESCALE(MULTIPLY(tmp10 - tmp11 - tmp11, FIX(1.257078722)), /* c4 */ |
---|
550 | CONST_BITS+PASS1_BITS); |
---|
551 | |
---|
552 | /* Odd part */ |
---|
553 | |
---|
554 | tmp10 = MULTIPLY(tmp0 + tmp2, FIX(0.650711829)); /* c5 */ |
---|
555 | |
---|
556 | dataptr[DCTSIZE*1] = (DCTELEM) |
---|
557 | DESCALE(tmp10 + MULTIPLY(tmp0 + tmp1, FIX(1.777777778)), /* 16/9 */ |
---|
558 | CONST_BITS+PASS1_BITS); |
---|
559 | dataptr[DCTSIZE*3] = (DCTELEM) |
---|
560 | DESCALE(MULTIPLY(tmp0 - tmp1 - tmp2, FIX(1.777777778)), /* 16/9 */ |
---|
561 | CONST_BITS+PASS1_BITS); |
---|
562 | dataptr[DCTSIZE*5] = (DCTELEM) |
---|
563 | DESCALE(tmp10 + MULTIPLY(tmp2 - tmp1, FIX(1.777777778)), /* 16/9 */ |
---|
564 | CONST_BITS+PASS1_BITS); |
---|
565 | |
---|
566 | dataptr++; /* advance pointer to next column */ |
---|
567 | } |
---|
568 | } |
---|
569 | |
---|
570 | |
---|
571 | /* |
---|
572 | * Perform the forward DCT on a 5x5 sample block. |
---|
573 | */ |
---|
574 | |
---|
575 | GLOBAL(void) |
---|
576 | jpeg_fdct_5x5 (DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col) |
---|
577 | { |
---|
578 | INT32 tmp0, tmp1, tmp2; |
---|
579 | INT32 tmp10, tmp11; |
---|
580 | DCTELEM *dataptr; |
---|
581 | JSAMPROW elemptr; |
---|
582 | int ctr; |
---|
583 | SHIFT_TEMPS |
---|
584 | |
---|
585 | /* Pre-zero output coefficient block. */ |
---|
586 | MEMZERO(data, SIZEOF(DCTELEM) * DCTSIZE2); |
---|
587 | |
---|
588 | /* Pass 1: process rows. */ |
---|
589 | /* Note results are scaled up by sqrt(8) compared to a true DCT; */ |
---|
590 | /* furthermore, we scale the results by 2**PASS1_BITS. */ |
---|
591 | /* We scale the results further by 2 as part of output adaption */ |
---|
592 | /* scaling for different DCT size. */ |
---|
593 | /* cK represents sqrt(2) * cos(K*pi/10). */ |
---|
594 | |
---|
595 | dataptr = data; |
---|
596 | for (ctr = 0; ctr < 5; ctr++) { |
---|
597 | elemptr = sample_data[ctr] + start_col; |
---|
598 | |
---|
599 | /* Even part */ |
---|
600 | |
---|
601 | tmp0 = GETJSAMPLE(elemptr[0]) + GETJSAMPLE(elemptr[4]); |
---|
602 | tmp1 = GETJSAMPLE(elemptr[1]) + GETJSAMPLE(elemptr[3]); |
---|
603 | tmp2 = GETJSAMPLE(elemptr[2]); |
---|
604 | |
---|
605 | tmp10 = tmp0 + tmp1; |
---|
606 | tmp11 = tmp0 - tmp1; |
---|
607 | |
---|
608 | tmp0 = GETJSAMPLE(elemptr[0]) - GETJSAMPLE(elemptr[4]); |
---|
609 | tmp1 = GETJSAMPLE(elemptr[1]) - GETJSAMPLE(elemptr[3]); |
---|
610 | |
---|
611 | /* Apply unsigned->signed conversion */ |
---|
612 | dataptr[0] = (DCTELEM) |
---|
613 | ((tmp10 + tmp2 - 5 * CENTERJSAMPLE) << (PASS1_BITS+1)); |
---|
614 | tmp11 = MULTIPLY(tmp11, FIX(0.790569415)); /* (c2+c4)/2 */ |
---|
615 | tmp10 -= tmp2 << 2; |
---|
616 | tmp10 = MULTIPLY(tmp10, FIX(0.353553391)); /* (c2-c4)/2 */ |
---|
617 | dataptr[2] = (DCTELEM) DESCALE(tmp11 + tmp10, CONST_BITS-PASS1_BITS-1); |
---|
618 | dataptr[4] = (DCTELEM) DESCALE(tmp11 - tmp10, CONST_BITS-PASS1_BITS-1); |
---|
619 | |
---|
620 | /* Odd part */ |
---|
621 | |
---|
622 | tmp10 = MULTIPLY(tmp0 + tmp1, FIX(0.831253876)); /* c3 */ |
---|
623 | |
---|
624 | dataptr[1] = (DCTELEM) |
---|
625 | DESCALE(tmp10 + MULTIPLY(tmp0, FIX(0.513743148)), /* c1-c3 */ |
---|
626 | CONST_BITS-PASS1_BITS-1); |
---|
627 | dataptr[3] = (DCTELEM) |
---|
628 | DESCALE(tmp10 - MULTIPLY(tmp1, FIX(2.176250899)), /* c1+c3 */ |
---|
629 | CONST_BITS-PASS1_BITS-1); |
---|
630 | |
---|
631 | dataptr += DCTSIZE; /* advance pointer to next row */ |
---|
632 | } |
---|
633 | |
---|
634 | /* Pass 2: process columns. |
---|
635 | * We remove the PASS1_BITS scaling, but leave the results scaled up |
---|
636 | * by an overall factor of 8. |
---|
637 | * We must also scale the output by (8/5)**2 = 64/25, which we partially |
---|
638 | * fold into the constant multipliers (other part was done in pass 1): |
---|
639 | * cK now represents sqrt(2) * cos(K*pi/10) * 32/25. |
---|
640 | */ |
---|
641 | |
---|
642 | dataptr = data; |
---|
643 | for (ctr = 0; ctr < 5; ctr++) { |
---|
644 | /* Even part */ |
---|
645 | |
---|
646 | tmp0 = dataptr[DCTSIZE*0] + dataptr[DCTSIZE*4]; |
---|
647 | tmp1 = dataptr[DCTSIZE*1] + dataptr[DCTSIZE*3]; |
---|
648 | tmp2 = dataptr[DCTSIZE*2]; |
---|
649 | |
---|
650 | tmp10 = tmp0 + tmp1; |
---|
651 | tmp11 = tmp0 - tmp1; |
---|
652 | |
---|
653 | tmp0 = dataptr[DCTSIZE*0] - dataptr[DCTSIZE*4]; |
---|
654 | tmp1 = dataptr[DCTSIZE*1] - dataptr[DCTSIZE*3]; |
---|
655 | |
---|
656 | dataptr[DCTSIZE*0] = (DCTELEM) |
---|
657 | DESCALE(MULTIPLY(tmp10 + tmp2, FIX(1.28)), /* 32/25 */ |
---|
658 | CONST_BITS+PASS1_BITS); |
---|
659 | tmp11 = MULTIPLY(tmp11, FIX(1.011928851)); /* (c2+c4)/2 */ |
---|
660 | tmp10 -= tmp2 << 2; |
---|
661 | tmp10 = MULTIPLY(tmp10, FIX(0.452548340)); /* (c2-c4)/2 */ |
---|
662 | dataptr[DCTSIZE*2] = (DCTELEM) DESCALE(tmp11 + tmp10, CONST_BITS+PASS1_BITS); |
---|
663 | dataptr[DCTSIZE*4] = (DCTELEM) DESCALE(tmp11 - tmp10, CONST_BITS+PASS1_BITS); |
---|
664 | |
---|
665 | /* Odd part */ |
---|
666 | |
---|
667 | tmp10 = MULTIPLY(tmp0 + tmp1, FIX(1.064004961)); /* c3 */ |
---|
668 | |
---|
669 | dataptr[DCTSIZE*1] = (DCTELEM) |
---|
670 | DESCALE(tmp10 + MULTIPLY(tmp0, FIX(0.657591230)), /* c1-c3 */ |
---|
671 | CONST_BITS+PASS1_BITS); |
---|
672 | dataptr[DCTSIZE*3] = (DCTELEM) |
---|
673 | DESCALE(tmp10 - MULTIPLY(tmp1, FIX(2.785601151)), /* c1+c3 */ |
---|
674 | CONST_BITS+PASS1_BITS); |
---|
675 | |
---|
676 | dataptr++; /* advance pointer to next column */ |
---|
677 | } |
---|
678 | } |
---|
679 | |
---|
680 | |
---|
681 | /* |
---|
682 | * Perform the forward DCT on a 4x4 sample block. |
---|
683 | */ |
---|
684 | |
---|
685 | GLOBAL(void) |
---|
686 | jpeg_fdct_4x4 (DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col) |
---|
687 | { |
---|
688 | INT32 tmp0, tmp1; |
---|
689 | INT32 tmp10, tmp11; |
---|
690 | DCTELEM *dataptr; |
---|
691 | JSAMPROW elemptr; |
---|
692 | int ctr; |
---|
693 | SHIFT_TEMPS |
---|
694 | |
---|
695 | /* Pre-zero output coefficient block. */ |
---|
696 | MEMZERO(data, SIZEOF(DCTELEM) * DCTSIZE2); |
---|
697 | |
---|
698 | /* Pass 1: process rows. */ |
---|
699 | /* Note results are scaled up by sqrt(8) compared to a true DCT; */ |
---|
700 | /* furthermore, we scale the results by 2**PASS1_BITS. */ |
---|
701 | /* We must also scale the output by (8/4)**2 = 2**2, which we add here. */ |
---|
702 | /* cK represents sqrt(2) * cos(K*pi/16) [refers to 8-point FDCT]. */ |
---|
703 | |
---|
704 | dataptr = data; |
---|
705 | for (ctr = 0; ctr < 4; ctr++) { |
---|
706 | elemptr = sample_data[ctr] + start_col; |
---|
707 | |
---|
708 | /* Even part */ |
---|
709 | |
---|
710 | tmp0 = GETJSAMPLE(elemptr[0]) + GETJSAMPLE(elemptr[3]); |
---|
711 | tmp1 = GETJSAMPLE(elemptr[1]) + GETJSAMPLE(elemptr[2]); |
---|
712 | |
---|
713 | tmp10 = GETJSAMPLE(elemptr[0]) - GETJSAMPLE(elemptr[3]); |
---|
714 | tmp11 = GETJSAMPLE(elemptr[1]) - GETJSAMPLE(elemptr[2]); |
---|
715 | |
---|
716 | /* Apply unsigned->signed conversion */ |
---|
717 | dataptr[0] = (DCTELEM) |
---|
718 | ((tmp0 + tmp1 - 4 * CENTERJSAMPLE) << (PASS1_BITS+2)); |
---|
719 | dataptr[2] = (DCTELEM) ((tmp0 - tmp1) << (PASS1_BITS+2)); |
---|
720 | |
---|
721 | /* Odd part */ |
---|
722 | |
---|
723 | tmp0 = MULTIPLY(tmp10 + tmp11, FIX_0_541196100); /* c6 */ |
---|
724 | /* Add fudge factor here for final descale. */ |
---|
725 | tmp0 += ONE << (CONST_BITS-PASS1_BITS-3); |
---|
726 | |
---|
727 | dataptr[1] = (DCTELEM) |
---|
728 | RIGHT_SHIFT(tmp0 + MULTIPLY(tmp10, FIX_0_765366865), /* c2-c6 */ |
---|
729 | CONST_BITS-PASS1_BITS-2); |
---|
730 | dataptr[3] = (DCTELEM) |
---|
731 | RIGHT_SHIFT(tmp0 - MULTIPLY(tmp11, FIX_1_847759065), /* c2+c6 */ |
---|
732 | CONST_BITS-PASS1_BITS-2); |
---|
733 | |
---|
734 | dataptr += DCTSIZE; /* advance pointer to next row */ |
---|
735 | } |
---|
736 | |
---|
737 | /* Pass 2: process columns. |
---|
738 | * We remove the PASS1_BITS scaling, but leave the results scaled up |
---|
739 | * by an overall factor of 8. |
---|
740 | */ |
---|
741 | |
---|
742 | dataptr = data; |
---|
743 | for (ctr = 0; ctr < 4; ctr++) { |
---|
744 | /* Even part */ |
---|
745 | |
---|
746 | /* Add fudge factor here for final descale. */ |
---|
747 | tmp0 = dataptr[DCTSIZE*0] + dataptr[DCTSIZE*3] + (ONE << (PASS1_BITS-1)); |
---|
748 | tmp1 = dataptr[DCTSIZE*1] + dataptr[DCTSIZE*2]; |
---|
749 | |
---|
750 | tmp10 = dataptr[DCTSIZE*0] - dataptr[DCTSIZE*3]; |
---|
751 | tmp11 = dataptr[DCTSIZE*1] - dataptr[DCTSIZE*2]; |
---|
752 | |
---|
753 | dataptr[DCTSIZE*0] = (DCTELEM) RIGHT_SHIFT(tmp0 + tmp1, PASS1_BITS); |
---|
754 | dataptr[DCTSIZE*2] = (DCTELEM) RIGHT_SHIFT(tmp0 - tmp1, PASS1_BITS); |
---|
755 | |
---|
756 | /* Odd part */ |
---|
757 | |
---|
758 | tmp0 = MULTIPLY(tmp10 + tmp11, FIX_0_541196100); /* c6 */ |
---|
759 | /* Add fudge factor here for final descale. */ |
---|
760 | tmp0 += ONE << (CONST_BITS+PASS1_BITS-1); |
---|
761 | |
---|
762 | dataptr[DCTSIZE*1] = (DCTELEM) |
---|
763 | RIGHT_SHIFT(tmp0 + MULTIPLY(tmp10, FIX_0_765366865), /* c2-c6 */ |
---|
764 | CONST_BITS+PASS1_BITS); |
---|
765 | dataptr[DCTSIZE*3] = (DCTELEM) |
---|
766 | RIGHT_SHIFT(tmp0 - MULTIPLY(tmp11, FIX_1_847759065), /* c2+c6 */ |
---|
767 | CONST_BITS+PASS1_BITS); |
---|
768 | |
---|
769 | dataptr++; /* advance pointer to next column */ |
---|
770 | } |
---|
771 | } |
---|
772 | |
---|
773 | |
---|
774 | /* |
---|
775 | * Perform the forward DCT on a 3x3 sample block. |
---|
776 | */ |
---|
777 | |
---|
778 | GLOBAL(void) |
---|
779 | jpeg_fdct_3x3 (DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col) |
---|
780 | { |
---|
781 | INT32 tmp0, tmp1, tmp2; |
---|
782 | DCTELEM *dataptr; |
---|
783 | JSAMPROW elemptr; |
---|
784 | int ctr; |
---|
785 | SHIFT_TEMPS |
---|
786 | |
---|
787 | /* Pre-zero output coefficient block. */ |
---|
788 | MEMZERO(data, SIZEOF(DCTELEM) * DCTSIZE2); |
---|
789 | |
---|
790 | /* Pass 1: process rows. */ |
---|
791 | /* Note results are scaled up by sqrt(8) compared to a true DCT; */ |
---|
792 | /* furthermore, we scale the results by 2**PASS1_BITS. */ |
---|
793 | /* We scale the results further by 2**2 as part of output adaption */ |
---|
794 | /* scaling for different DCT size. */ |
---|
795 | /* cK represents sqrt(2) * cos(K*pi/6). */ |
---|
796 | |
---|
797 | dataptr = data; |
---|
798 | for (ctr = 0; ctr < 3; ctr++) { |
---|
799 | elemptr = sample_data[ctr] + start_col; |
---|
800 | |
---|
801 | /* Even part */ |
---|
802 | |
---|
803 | tmp0 = GETJSAMPLE(elemptr[0]) + GETJSAMPLE(elemptr[2]); |
---|
804 | tmp1 = GETJSAMPLE(elemptr[1]); |
---|
805 | |
---|
806 | tmp2 = GETJSAMPLE(elemptr[0]) - GETJSAMPLE(elemptr[2]); |
---|
807 | |
---|
808 | /* Apply unsigned->signed conversion */ |
---|
809 | dataptr[0] = (DCTELEM) |
---|
810 | ((tmp0 + tmp1 - 3 * CENTERJSAMPLE) << (PASS1_BITS+2)); |
---|
811 | dataptr[2] = (DCTELEM) |
---|
812 | DESCALE(MULTIPLY(tmp0 - tmp1 - tmp1, FIX(0.707106781)), /* c2 */ |
---|
813 | CONST_BITS-PASS1_BITS-2); |
---|
814 | |
---|
815 | /* Odd part */ |
---|
816 | |
---|
817 | dataptr[1] = (DCTELEM) |
---|
818 | DESCALE(MULTIPLY(tmp2, FIX(1.224744871)), /* c1 */ |
---|
819 | CONST_BITS-PASS1_BITS-2); |
---|
820 | |
---|
821 | dataptr += DCTSIZE; /* advance pointer to next row */ |
---|
822 | } |
---|
823 | |
---|
824 | /* Pass 2: process columns. |
---|
825 | * We remove the PASS1_BITS scaling, but leave the results scaled up |
---|
826 | * by an overall factor of 8. |
---|
827 | * We must also scale the output by (8/3)**2 = 64/9, which we partially |
---|
828 | * fold into the constant multipliers (other part was done in pass 1): |
---|
829 | * cK now represents sqrt(2) * cos(K*pi/6) * 16/9. |
---|
830 | */ |
---|
831 | |
---|
832 | dataptr = data; |
---|
833 | for (ctr = 0; ctr < 3; ctr++) { |
---|
834 | /* Even part */ |
---|
835 | |
---|
836 | tmp0 = dataptr[DCTSIZE*0] + dataptr[DCTSIZE*2]; |
---|
837 | tmp1 = dataptr[DCTSIZE*1]; |
---|
838 | |
---|
839 | tmp2 = dataptr[DCTSIZE*0] - dataptr[DCTSIZE*2]; |
---|
840 | |
---|
841 | dataptr[DCTSIZE*0] = (DCTELEM) |
---|
842 | DESCALE(MULTIPLY(tmp0 + tmp1, FIX(1.777777778)), /* 16/9 */ |
---|
843 | CONST_BITS+PASS1_BITS); |
---|
844 | dataptr[DCTSIZE*2] = (DCTELEM) |
---|
845 | DESCALE(MULTIPLY(tmp0 - tmp1 - tmp1, FIX(1.257078722)), /* c2 */ |
---|
846 | CONST_BITS+PASS1_BITS); |
---|
847 | |
---|
848 | /* Odd part */ |
---|
849 | |
---|
850 | dataptr[DCTSIZE*1] = (DCTELEM) |
---|
851 | DESCALE(MULTIPLY(tmp2, FIX(2.177324216)), /* c1 */ |
---|
852 | CONST_BITS+PASS1_BITS); |
---|
853 | |
---|
854 | dataptr++; /* advance pointer to next column */ |
---|
855 | } |
---|
856 | } |
---|
857 | |
---|
858 | |
---|
859 | /* |
---|
860 | * Perform the forward DCT on a 2x2 sample block. |
---|
861 | */ |
---|
862 | |
---|
863 | GLOBAL(void) |
---|
864 | jpeg_fdct_2x2 (DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col) |
---|
865 | { |
---|
866 | INT32 tmp0, tmp1, tmp2, tmp3; |
---|
867 | JSAMPROW elemptr; |
---|
868 | |
---|
869 | /* Pre-zero output coefficient block. */ |
---|
870 | MEMZERO(data, SIZEOF(DCTELEM) * DCTSIZE2); |
---|
871 | |
---|
872 | /* Pass 1: process rows. */ |
---|
873 | /* Note results are scaled up by sqrt(8) compared to a true DCT. */ |
---|
874 | |
---|
875 | /* Row 0 */ |
---|
876 | elemptr = sample_data[0] + start_col; |
---|
877 | |
---|
878 | tmp0 = GETJSAMPLE(elemptr[0]) + GETJSAMPLE(elemptr[1]); |
---|
879 | tmp1 = GETJSAMPLE(elemptr[0]) - GETJSAMPLE(elemptr[1]); |
---|
880 | |
---|
881 | /* Row 1 */ |
---|
882 | elemptr = sample_data[1] + start_col; |
---|
883 | |
---|
884 | tmp2 = GETJSAMPLE(elemptr[0]) + GETJSAMPLE(elemptr[1]); |
---|
885 | tmp3 = GETJSAMPLE(elemptr[0]) - GETJSAMPLE(elemptr[1]); |
---|
886 | |
---|
887 | /* Pass 2: process columns. |
---|
888 | * We leave the results scaled up by an overall factor of 8. |
---|
889 | * We must also scale the output by (8/2)**2 = 2**4. |
---|
890 | */ |
---|
891 | |
---|
892 | /* Column 0 */ |
---|
893 | /* Apply unsigned->signed conversion */ |
---|
894 | data[DCTSIZE*0] = (DCTELEM) ((tmp0 + tmp2 - 4 * CENTERJSAMPLE) << 4); |
---|
895 | data[DCTSIZE*1] = (DCTELEM) ((tmp0 - tmp2) << 4); |
---|
896 | |
---|
897 | /* Column 1 */ |
---|
898 | data[DCTSIZE*0+1] = (DCTELEM) ((tmp1 + tmp3) << 4); |
---|
899 | data[DCTSIZE*1+1] = (DCTELEM) ((tmp1 - tmp3) << 4); |
---|
900 | } |
---|
901 | |
---|
902 | |
---|
903 | /* |
---|
904 | * Perform the forward DCT on a 1x1 sample block. |
---|
905 | */ |
---|
906 | |
---|
907 | GLOBAL(void) |
---|
908 | jpeg_fdct_1x1 (DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col) |
---|
909 | { |
---|
910 | /* Pre-zero output coefficient block. */ |
---|
911 | MEMZERO(data, SIZEOF(DCTELEM) * DCTSIZE2); |
---|
912 | |
---|
913 | /* We leave the result scaled up by an overall factor of 8. */ |
---|
914 | /* We must also scale the output by (8/1)**2 = 2**6. */ |
---|
915 | /* Apply unsigned->signed conversion */ |
---|
916 | data[0] = (DCTELEM) |
---|
917 | ((GETJSAMPLE(sample_data[0][start_col]) - CENTERJSAMPLE) << 6); |
---|
918 | } |
---|
919 | |
---|
920 | |
---|
921 | /* |
---|
922 | * Perform the forward DCT on a 9x9 sample block. |
---|
923 | */ |
---|
924 | |
---|
925 | GLOBAL(void) |
---|
926 | jpeg_fdct_9x9 (DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col) |
---|
927 | { |
---|
928 | INT32 tmp0, tmp1, tmp2, tmp3, tmp4; |
---|
929 | INT32 tmp10, tmp11, tmp12, tmp13; |
---|
930 | INT32 z1, z2; |
---|
931 | DCTELEM workspace[8]; |
---|
932 | DCTELEM *dataptr; |
---|
933 | DCTELEM *wsptr; |
---|
934 | JSAMPROW elemptr; |
---|
935 | int ctr; |
---|
936 | SHIFT_TEMPS |
---|
937 | |
---|
938 | /* Pass 1: process rows. */ |
---|
939 | /* Note results are scaled up by sqrt(8) compared to a true DCT; */ |
---|
940 | /* we scale the results further by 2 as part of output adaption */ |
---|
941 | /* scaling for different DCT size. */ |
---|
942 | /* cK represents sqrt(2) * cos(K*pi/18). */ |
---|
943 | |
---|
944 | dataptr = data; |
---|
945 | ctr = 0; |
---|
946 | for (;;) { |
---|
947 | elemptr = sample_data[ctr] + start_col; |
---|
948 | |
---|
949 | /* Even part */ |
---|
950 | |
---|
951 | tmp0 = GETJSAMPLE(elemptr[0]) + GETJSAMPLE(elemptr[8]); |
---|
952 | tmp1 = GETJSAMPLE(elemptr[1]) + GETJSAMPLE(elemptr[7]); |
---|
953 | tmp2 = GETJSAMPLE(elemptr[2]) + GETJSAMPLE(elemptr[6]); |
---|
954 | tmp3 = GETJSAMPLE(elemptr[3]) + GETJSAMPLE(elemptr[5]); |
---|
955 | tmp4 = GETJSAMPLE(elemptr[4]); |
---|
956 | |
---|
957 | tmp10 = GETJSAMPLE(elemptr[0]) - GETJSAMPLE(elemptr[8]); |
---|
958 | tmp11 = GETJSAMPLE(elemptr[1]) - GETJSAMPLE(elemptr[7]); |
---|
959 | tmp12 = GETJSAMPLE(elemptr[2]) - GETJSAMPLE(elemptr[6]); |
---|
960 | tmp13 = GETJSAMPLE(elemptr[3]) - GETJSAMPLE(elemptr[5]); |
---|
961 | |
---|
962 | z1 = tmp0 + tmp2 + tmp3; |
---|
963 | z2 = tmp1 + tmp4; |
---|
964 | /* Apply unsigned->signed conversion */ |
---|
965 | dataptr[0] = (DCTELEM) ((z1 + z2 - 9 * CENTERJSAMPLE) << 1); |
---|
966 | dataptr[6] = (DCTELEM) |
---|
967 | DESCALE(MULTIPLY(z1 - z2 - z2, FIX(0.707106781)), /* c6 */ |
---|
968 | CONST_BITS-1); |
---|
969 | z1 = MULTIPLY(tmp0 - tmp2, FIX(1.328926049)); /* c2 */ |
---|
970 | z2 = MULTIPLY(tmp1 - tmp4 - tmp4, FIX(0.707106781)); /* c6 */ |
---|
971 | dataptr[2] = (DCTELEM) |
---|
972 | DESCALE(MULTIPLY(tmp2 - tmp3, FIX(1.083350441)) /* c4 */ |
---|
973 | + z1 + z2, CONST_BITS-1); |
---|
974 | dataptr[4] = (DCTELEM) |
---|
975 | DESCALE(MULTIPLY(tmp3 - tmp0, FIX(0.245575608)) /* c8 */ |
---|
976 | + z1 - z2, CONST_BITS-1); |
---|
977 | |
---|
978 | /* Odd part */ |
---|
979 | |
---|
980 | dataptr[3] = (DCTELEM) |
---|
981 | DESCALE(MULTIPLY(tmp10 - tmp12 - tmp13, FIX(1.224744871)), /* c3 */ |
---|
982 | CONST_BITS-1); |
---|
983 | |
---|
984 | tmp11 = MULTIPLY(tmp11, FIX(1.224744871)); /* c3 */ |
---|
985 | tmp0 = MULTIPLY(tmp10 + tmp12, FIX(0.909038955)); /* c5 */ |
---|
986 | tmp1 = MULTIPLY(tmp10 + tmp13, FIX(0.483689525)); /* c7 */ |
---|
987 | |
---|
988 | dataptr[1] = (DCTELEM) DESCALE(tmp11 + tmp0 + tmp1, CONST_BITS-1); |
---|
989 | |
---|
990 | tmp2 = MULTIPLY(tmp12 - tmp13, FIX(1.392728481)); /* c1 */ |
---|
991 | |
---|
992 | dataptr[5] = (DCTELEM) DESCALE(tmp0 - tmp11 - tmp2, CONST_BITS-1); |
---|
993 | dataptr[7] = (DCTELEM) DESCALE(tmp1 - tmp11 + tmp2, CONST_BITS-1); |
---|
994 | |
---|
995 | ctr++; |
---|
996 | |
---|
997 | if (ctr != DCTSIZE) { |
---|
998 | if (ctr == 9) |
---|
999 | break; /* Done. */ |
---|
1000 | dataptr += DCTSIZE; /* advance pointer to next row */ |
---|
1001 | } else |
---|
1002 | dataptr = workspace; /* switch pointer to extended workspace */ |
---|
1003 | } |
---|
1004 | |
---|
1005 | /* Pass 2: process columns. |
---|
1006 | * We leave the results scaled up by an overall factor of 8. |
---|
1007 | * We must also scale the output by (8/9)**2 = 64/81, which we partially |
---|
1008 | * fold into the constant multipliers and final/initial shifting: |
---|
1009 | * cK now represents sqrt(2) * cos(K*pi/18) * 128/81. |
---|
1010 | */ |
---|
1011 | |
---|
1012 | dataptr = data; |
---|
1013 | wsptr = workspace; |
---|
1014 | for (ctr = DCTSIZE-1; ctr >= 0; ctr--) { |
---|
1015 | /* Even part */ |
---|
1016 | |
---|
1017 | tmp0 = dataptr[DCTSIZE*0] + wsptr[DCTSIZE*0]; |
---|
1018 | tmp1 = dataptr[DCTSIZE*1] + dataptr[DCTSIZE*7]; |
---|
1019 | tmp2 = dataptr[DCTSIZE*2] + dataptr[DCTSIZE*6]; |
---|
1020 | tmp3 = dataptr[DCTSIZE*3] + dataptr[DCTSIZE*5]; |
---|
1021 | tmp4 = dataptr[DCTSIZE*4]; |
---|
1022 | |
---|
1023 | tmp10 = dataptr[DCTSIZE*0] - wsptr[DCTSIZE*0]; |
---|
1024 | tmp11 = dataptr[DCTSIZE*1] - dataptr[DCTSIZE*7]; |
---|
1025 | tmp12 = dataptr[DCTSIZE*2] - dataptr[DCTSIZE*6]; |
---|
1026 | tmp13 = dataptr[DCTSIZE*3] - dataptr[DCTSIZE*5]; |
---|
1027 | |
---|
1028 | z1 = tmp0 + tmp2 + tmp3; |
---|
1029 | z2 = tmp1 + tmp4; |
---|
1030 | dataptr[DCTSIZE*0] = (DCTELEM) |
---|
1031 | DESCALE(MULTIPLY(z1 + z2, FIX(1.580246914)), /* 128/81 */ |
---|
1032 | CONST_BITS+2); |
---|
1033 | dataptr[DCTSIZE*6] = (DCTELEM) |
---|
1034 | DESCALE(MULTIPLY(z1 - z2 - z2, FIX(1.117403309)), /* c6 */ |
---|
1035 | CONST_BITS+2); |
---|
1036 | z1 = MULTIPLY(tmp0 - tmp2, FIX(2.100031287)); /* c2 */ |
---|
1037 | z2 = MULTIPLY(tmp1 - tmp4 - tmp4, FIX(1.117403309)); /* c6 */ |
---|
1038 | dataptr[DCTSIZE*2] = (DCTELEM) |
---|
1039 | DESCALE(MULTIPLY(tmp2 - tmp3, FIX(1.711961190)) /* c4 */ |
---|
1040 | + z1 + z2, CONST_BITS+2); |
---|
1041 | dataptr[DCTSIZE*4] = (DCTELEM) |
---|
1042 | DESCALE(MULTIPLY(tmp3 - tmp0, FIX(0.388070096)) /* c8 */ |
---|
1043 | + z1 - z2, CONST_BITS+2); |
---|
1044 | |
---|
1045 | /* Odd part */ |
---|
1046 | |
---|
1047 | dataptr[DCTSIZE*3] = (DCTELEM) |
---|
1048 | DESCALE(MULTIPLY(tmp10 - tmp12 - tmp13, FIX(1.935399303)), /* c3 */ |
---|
1049 | CONST_BITS+2); |
---|
1050 | |
---|
1051 | tmp11 = MULTIPLY(tmp11, FIX(1.935399303)); /* c3 */ |
---|
1052 | tmp0 = MULTIPLY(tmp10 + tmp12, FIX(1.436506004)); /* c5 */ |
---|
1053 | tmp1 = MULTIPLY(tmp10 + tmp13, FIX(0.764348879)); /* c7 */ |
---|
1054 | |
---|
1055 | dataptr[DCTSIZE*1] = (DCTELEM) |
---|
1056 | DESCALE(tmp11 + tmp0 + tmp1, CONST_BITS+2); |
---|
1057 | |
---|
1058 | tmp2 = MULTIPLY(tmp12 - tmp13, FIX(2.200854883)); /* c1 */ |
---|
1059 | |
---|
1060 | dataptr[DCTSIZE*5] = (DCTELEM) |
---|
1061 | DESCALE(tmp0 - tmp11 - tmp2, CONST_BITS+2); |
---|
1062 | dataptr[DCTSIZE*7] = (DCTELEM) |
---|
1063 | DESCALE(tmp1 - tmp11 + tmp2, CONST_BITS+2); |
---|
1064 | |
---|
1065 | dataptr++; /* advance pointer to next column */ |
---|
1066 | wsptr++; /* advance pointer to next column */ |
---|
1067 | } |
---|
1068 | } |
---|
1069 | |
---|
1070 | |
---|
1071 | /* |
---|
1072 | * Perform the forward DCT on a 10x10 sample block. |
---|
1073 | */ |
---|
1074 | |
---|
1075 | GLOBAL(void) |
---|
1076 | jpeg_fdct_10x10 (DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col) |
---|
1077 | { |
---|
1078 | INT32 tmp0, tmp1, tmp2, tmp3, tmp4; |
---|
1079 | INT32 tmp10, tmp11, tmp12, tmp13, tmp14; |
---|
1080 | DCTELEM workspace[8*2]; |
---|
1081 | DCTELEM *dataptr; |
---|
1082 | DCTELEM *wsptr; |
---|
1083 | JSAMPROW elemptr; |
---|
1084 | int ctr; |
---|
1085 | SHIFT_TEMPS |
---|
1086 | |
---|
1087 | /* Pass 1: process rows. */ |
---|
1088 | /* Note results are scaled up by sqrt(8) compared to a true DCT; */ |
---|
1089 | /* we scale the results further by 2 as part of output adaption */ |
---|
1090 | /* scaling for different DCT size. */ |
---|
1091 | /* cK represents sqrt(2) * cos(K*pi/20). */ |
---|
1092 | |
---|
1093 | dataptr = data; |
---|
1094 | ctr = 0; |
---|
1095 | for (;;) { |
---|
1096 | elemptr = sample_data[ctr] + start_col; |
---|
1097 | |
---|
1098 | /* Even part */ |
---|
1099 | |
---|
1100 | tmp0 = GETJSAMPLE(elemptr[0]) + GETJSAMPLE(elemptr[9]); |
---|
1101 | tmp1 = GETJSAMPLE(elemptr[1]) + GETJSAMPLE(elemptr[8]); |
---|
1102 | tmp12 = GETJSAMPLE(elemptr[2]) + GETJSAMPLE(elemptr[7]); |
---|
1103 | tmp3 = GETJSAMPLE(elemptr[3]) + GETJSAMPLE(elemptr[6]); |
---|
1104 | tmp4 = GETJSAMPLE(elemptr[4]) + GETJSAMPLE(elemptr[5]); |
---|
1105 | |
---|
1106 | tmp10 = tmp0 + tmp4; |
---|
1107 | tmp13 = tmp0 - tmp4; |
---|
1108 | tmp11 = tmp1 + tmp3; |
---|
1109 | tmp14 = tmp1 - tmp3; |
---|
1110 | |
---|
1111 | tmp0 = GETJSAMPLE(elemptr[0]) - GETJSAMPLE(elemptr[9]); |
---|
1112 | tmp1 = GETJSAMPLE(elemptr[1]) - GETJSAMPLE(elemptr[8]); |
---|
1113 | tmp2 = GETJSAMPLE(elemptr[2]) - GETJSAMPLE(elemptr[7]); |
---|
1114 | tmp3 = GETJSAMPLE(elemptr[3]) - GETJSAMPLE(elemptr[6]); |
---|
1115 | tmp4 = GETJSAMPLE(elemptr[4]) - GETJSAMPLE(elemptr[5]); |
---|
1116 | |
---|
1117 | /* Apply unsigned->signed conversion */ |
---|
1118 | dataptr[0] = (DCTELEM) |
---|
1119 | ((tmp10 + tmp11 + tmp12 - 10 * CENTERJSAMPLE) << 1); |
---|
1120 | tmp12 += tmp12; |
---|
1121 | dataptr[4] = (DCTELEM) |
---|
1122 | DESCALE(MULTIPLY(tmp10 - tmp12, FIX(1.144122806)) - /* c4 */ |
---|
1123 | MULTIPLY(tmp11 - tmp12, FIX(0.437016024)), /* c8 */ |
---|
1124 | CONST_BITS-1); |
---|
1125 | tmp10 = MULTIPLY(tmp13 + tmp14, FIX(0.831253876)); /* c6 */ |
---|
1126 | dataptr[2] = (DCTELEM) |
---|
1127 | DESCALE(tmp10 + MULTIPLY(tmp13, FIX(0.513743148)), /* c2-c6 */ |
---|
1128 | CONST_BITS-1); |
---|
1129 | dataptr[6] = (DCTELEM) |
---|
1130 | DESCALE(tmp10 - MULTIPLY(tmp14, FIX(2.176250899)), /* c2+c6 */ |
---|
1131 | CONST_BITS-1); |
---|
1132 | |
---|
1133 | /* Odd part */ |
---|
1134 | |
---|
1135 | tmp10 = tmp0 + tmp4; |
---|
1136 | tmp11 = tmp1 - tmp3; |
---|
1137 | dataptr[5] = (DCTELEM) ((tmp10 - tmp11 - tmp2) << 1); |
---|
1138 | tmp2 <<= CONST_BITS; |
---|
1139 | dataptr[1] = (DCTELEM) |
---|
1140 | DESCALE(MULTIPLY(tmp0, FIX(1.396802247)) + /* c1 */ |
---|
1141 | MULTIPLY(tmp1, FIX(1.260073511)) + tmp2 + /* c3 */ |
---|
1142 | MULTIPLY(tmp3, FIX(0.642039522)) + /* c7 */ |
---|
1143 | MULTIPLY(tmp4, FIX(0.221231742)), /* c9 */ |
---|
1144 | CONST_BITS-1); |
---|
1145 | tmp12 = MULTIPLY(tmp0 - tmp4, FIX(0.951056516)) - /* (c3+c7)/2 */ |
---|
1146 | MULTIPLY(tmp1 + tmp3, FIX(0.587785252)); /* (c1-c9)/2 */ |
---|
1147 | tmp13 = MULTIPLY(tmp10 + tmp11, FIX(0.309016994)) + /* (c3-c7)/2 */ |
---|
1148 | (tmp11 << (CONST_BITS - 1)) - tmp2; |
---|
1149 | dataptr[3] = (DCTELEM) DESCALE(tmp12 + tmp13, CONST_BITS-1); |
---|
1150 | dataptr[7] = (DCTELEM) DESCALE(tmp12 - tmp13, CONST_BITS-1); |
---|
1151 | |
---|
1152 | ctr++; |
---|
1153 | |
---|
1154 | if (ctr != DCTSIZE) { |
---|
1155 | if (ctr == 10) |
---|
1156 | break; /* Done. */ |
---|
1157 | dataptr += DCTSIZE; /* advance pointer to next row */ |
---|
1158 | } else |
---|
1159 | dataptr = workspace; /* switch pointer to extended workspace */ |
---|
1160 | } |
---|
1161 | |
---|
1162 | /* Pass 2: process columns. |
---|
1163 | * We leave the results scaled up by an overall factor of 8. |
---|
1164 | * We must also scale the output by (8/10)**2 = 16/25, which we partially |
---|
1165 | * fold into the constant multipliers and final/initial shifting: |
---|
1166 | * cK now represents sqrt(2) * cos(K*pi/20) * 32/25. |
---|
1167 | */ |
---|
1168 | |
---|
1169 | dataptr = data; |
---|
1170 | wsptr = workspace; |
---|
1171 | for (ctr = DCTSIZE-1; ctr >= 0; ctr--) { |
---|
1172 | /* Even part */ |
---|
1173 | |
---|
1174 | tmp0 = dataptr[DCTSIZE*0] + wsptr[DCTSIZE*1]; |
---|
1175 | tmp1 = dataptr[DCTSIZE*1] + wsptr[DCTSIZE*0]; |
---|
1176 | tmp12 = dataptr[DCTSIZE*2] + dataptr[DCTSIZE*7]; |
---|
1177 | tmp3 = dataptr[DCTSIZE*3] + dataptr[DCTSIZE*6]; |
---|
1178 | tmp4 = dataptr[DCTSIZE*4] + dataptr[DCTSIZE*5]; |
---|
1179 | |
---|
1180 | tmp10 = tmp0 + tmp4; |
---|
1181 | tmp13 = tmp0 - tmp4; |
---|
1182 | tmp11 = tmp1 + tmp3; |
---|
1183 | tmp14 = tmp1 - tmp3; |
---|
1184 | |
---|
1185 | tmp0 = dataptr[DCTSIZE*0] - wsptr[DCTSIZE*1]; |
---|
1186 | tmp1 = dataptr[DCTSIZE*1] - wsptr[DCTSIZE*0]; |
---|
1187 | tmp2 = dataptr[DCTSIZE*2] - dataptr[DCTSIZE*7]; |
---|
1188 | tmp3 = dataptr[DCTSIZE*3] - dataptr[DCTSIZE*6]; |
---|
1189 | tmp4 = dataptr[DCTSIZE*4] - dataptr[DCTSIZE*5]; |
---|
1190 | |
---|
1191 | dataptr[DCTSIZE*0] = (DCTELEM) |
---|
1192 | DESCALE(MULTIPLY(tmp10 + tmp11 + tmp12, FIX(1.28)), /* 32/25 */ |
---|
1193 | CONST_BITS+2); |
---|
1194 | tmp12 += tmp12; |
---|
1195 | dataptr[DCTSIZE*4] = (DCTELEM) |
---|
1196 | DESCALE(MULTIPLY(tmp10 - tmp12, FIX(1.464477191)) - /* c4 */ |
---|
1197 | MULTIPLY(tmp11 - tmp12, FIX(0.559380511)), /* c8 */ |
---|
1198 | CONST_BITS+2); |
---|
1199 | tmp10 = MULTIPLY(tmp13 + tmp14, FIX(1.064004961)); /* c6 */ |
---|
1200 | dataptr[DCTSIZE*2] = (DCTELEM) |
---|
1201 | DESCALE(tmp10 + MULTIPLY(tmp13, FIX(0.657591230)), /* c2-c6 */ |
---|
1202 | CONST_BITS+2); |
---|
1203 | dataptr[DCTSIZE*6] = (DCTELEM) |
---|
1204 | DESCALE(tmp10 - MULTIPLY(tmp14, FIX(2.785601151)), /* c2+c6 */ |
---|
1205 | CONST_BITS+2); |
---|
1206 | |
---|
1207 | /* Odd part */ |
---|
1208 | |
---|
1209 | tmp10 = tmp0 + tmp4; |
---|
1210 | tmp11 = tmp1 - tmp3; |
---|
1211 | dataptr[DCTSIZE*5] = (DCTELEM) |
---|
1212 | DESCALE(MULTIPLY(tmp10 - tmp11 - tmp2, FIX(1.28)), /* 32/25 */ |
---|
1213 | CONST_BITS+2); |
---|
1214 | tmp2 = MULTIPLY(tmp2, FIX(1.28)); /* 32/25 */ |
---|
1215 | dataptr[DCTSIZE*1] = (DCTELEM) |
---|
1216 | DESCALE(MULTIPLY(tmp0, FIX(1.787906876)) + /* c1 */ |
---|
1217 | MULTIPLY(tmp1, FIX(1.612894094)) + tmp2 + /* c3 */ |
---|
1218 | MULTIPLY(tmp3, FIX(0.821810588)) + /* c7 */ |
---|
1219 | MULTIPLY(tmp4, FIX(0.283176630)), /* c9 */ |
---|
1220 | CONST_BITS+2); |
---|
1221 | tmp12 = MULTIPLY(tmp0 - tmp4, FIX(1.217352341)) - /* (c3+c7)/2 */ |
---|
1222 | MULTIPLY(tmp1 + tmp3, FIX(0.752365123)); /* (c1-c9)/2 */ |
---|
1223 | tmp13 = MULTIPLY(tmp10 + tmp11, FIX(0.395541753)) + /* (c3-c7)/2 */ |
---|
1224 | MULTIPLY(tmp11, FIX(0.64)) - tmp2; /* 16/25 */ |
---|
1225 | dataptr[DCTSIZE*3] = (DCTELEM) DESCALE(tmp12 + tmp13, CONST_BITS+2); |
---|
1226 | dataptr[DCTSIZE*7] = (DCTELEM) DESCALE(tmp12 - tmp13, CONST_BITS+2); |
---|
1227 | |
---|
1228 | dataptr++; /* advance pointer to next column */ |
---|
1229 | wsptr++; /* advance pointer to next column */ |
---|
1230 | } |
---|
1231 | } |
---|
1232 | |
---|
1233 | |
---|
1234 | /* |
---|
1235 | * Perform the forward DCT on an 11x11 sample block. |
---|
1236 | */ |
---|
1237 | |
---|
1238 | GLOBAL(void) |
---|
1239 | jpeg_fdct_11x11 (DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col) |
---|
1240 | { |
---|
1241 | INT32 tmp0, tmp1, tmp2, tmp3, tmp4, tmp5; |
---|
1242 | INT32 tmp10, tmp11, tmp12, tmp13, tmp14; |
---|
1243 | INT32 z1, z2, z3; |
---|
1244 | DCTELEM workspace[8*3]; |
---|
1245 | DCTELEM *dataptr; |
---|
1246 | DCTELEM *wsptr; |
---|
1247 | JSAMPROW elemptr; |
---|
1248 | int ctr; |
---|
1249 | SHIFT_TEMPS |
---|
1250 | |
---|
1251 | /* Pass 1: process rows. */ |
---|
1252 | /* Note results are scaled up by sqrt(8) compared to a true DCT; */ |
---|
1253 | /* we scale the results further by 2 as part of output adaption */ |
---|
1254 | /* scaling for different DCT size. */ |
---|
1255 | /* cK represents sqrt(2) * cos(K*pi/22). */ |
---|
1256 | |
---|
1257 | dataptr = data; |
---|
1258 | ctr = 0; |
---|
1259 | for (;;) { |
---|
1260 | elemptr = sample_data[ctr] + start_col; |
---|
1261 | |
---|
1262 | /* Even part */ |
---|
1263 | |
---|
1264 | tmp0 = GETJSAMPLE(elemptr[0]) + GETJSAMPLE(elemptr[10]); |
---|
1265 | tmp1 = GETJSAMPLE(elemptr[1]) + GETJSAMPLE(elemptr[9]); |
---|
1266 | tmp2 = GETJSAMPLE(elemptr[2]) + GETJSAMPLE(elemptr[8]); |
---|
1267 | tmp3 = GETJSAMPLE(elemptr[3]) + GETJSAMPLE(elemptr[7]); |
---|
1268 | tmp4 = GETJSAMPLE(elemptr[4]) + GETJSAMPLE(elemptr[6]); |
---|
1269 | tmp5 = GETJSAMPLE(elemptr[5]); |
---|
1270 | |
---|
1271 | tmp10 = GETJSAMPLE(elemptr[0]) - GETJSAMPLE(elemptr[10]); |
---|
1272 | tmp11 = GETJSAMPLE(elemptr[1]) - GETJSAMPLE(elemptr[9]); |
---|
1273 | tmp12 = GETJSAMPLE(elemptr[2]) - GETJSAMPLE(elemptr[8]); |
---|
1274 | tmp13 = GETJSAMPLE(elemptr[3]) - GETJSAMPLE(elemptr[7]); |
---|
1275 | tmp14 = GETJSAMPLE(elemptr[4]) - GETJSAMPLE(elemptr[6]); |
---|
1276 | |
---|
1277 | /* Apply unsigned->signed conversion */ |
---|
1278 | dataptr[0] = (DCTELEM) |
---|
1279 | ((tmp0 + tmp1 + tmp2 + tmp3 + tmp4 + tmp5 - 11 * CENTERJSAMPLE) << 1); |
---|
1280 | tmp5 += tmp5; |
---|
1281 | tmp0 -= tmp5; |
---|
1282 | tmp1 -= tmp5; |
---|
1283 | tmp2 -= tmp5; |
---|
1284 | tmp3 -= tmp5; |
---|
1285 | tmp4 -= tmp5; |
---|
1286 | z1 = MULTIPLY(tmp0 + tmp3, FIX(1.356927976)) + /* c2 */ |
---|
1287 | MULTIPLY(tmp2 + tmp4, FIX(0.201263574)); /* c10 */ |
---|
1288 | z2 = MULTIPLY(tmp1 - tmp3, FIX(0.926112931)); /* c6 */ |
---|
1289 | z3 = MULTIPLY(tmp0 - tmp1, FIX(1.189712156)); /* c4 */ |
---|
1290 | dataptr[2] = (DCTELEM) |
---|
1291 | DESCALE(z1 + z2 - MULTIPLY(tmp3, FIX(1.018300590)) /* c2+c8-c6 */ |
---|
1292 | - MULTIPLY(tmp4, FIX(1.390975730)), /* c4+c10 */ |
---|
1293 | CONST_BITS-1); |
---|
1294 | dataptr[4] = (DCTELEM) |
---|
1295 | DESCALE(z2 + z3 + MULTIPLY(tmp1, FIX(0.062335650)) /* c4-c6-c10 */ |
---|
1296 | - MULTIPLY(tmp2, FIX(1.356927976)) /* c2 */ |
---|
1297 | + MULTIPLY(tmp4, FIX(0.587485545)), /* c8 */ |
---|
1298 | CONST_BITS-1); |
---|
1299 | dataptr[6] = (DCTELEM) |
---|
1300 | DESCALE(z1 + z3 - MULTIPLY(tmp0, FIX(1.620527200)) /* c2+c4-c6 */ |
---|
1301 | - MULTIPLY(tmp2, FIX(0.788749120)), /* c8+c10 */ |
---|
1302 | CONST_BITS-1); |
---|
1303 | |
---|
1304 | /* Odd part */ |
---|
1305 | |
---|
1306 | tmp1 = MULTIPLY(tmp10 + tmp11, FIX(1.286413905)); /* c3 */ |
---|
1307 | tmp2 = MULTIPLY(tmp10 + tmp12, FIX(1.068791298)); /* c5 */ |
---|
1308 | tmp3 = MULTIPLY(tmp10 + tmp13, FIX(0.764581576)); /* c7 */ |
---|
1309 | tmp0 = tmp1 + tmp2 + tmp3 - MULTIPLY(tmp10, FIX(1.719967871)) /* c7+c5+c3-c1 */ |
---|
1310 | + MULTIPLY(tmp14, FIX(0.398430003)); /* c9 */ |
---|
1311 | tmp4 = MULTIPLY(tmp11 + tmp12, - FIX(0.764581576)); /* -c7 */ |
---|
1312 | tmp5 = MULTIPLY(tmp11 + tmp13, - FIX(1.399818907)); /* -c1 */ |
---|
1313 | tmp1 += tmp4 + tmp5 + MULTIPLY(tmp11, FIX(1.276416582)) /* c9+c7+c1-c3 */ |
---|
1314 | - MULTIPLY(tmp14, FIX(1.068791298)); /* c5 */ |
---|
1315 | tmp10 = MULTIPLY(tmp12 + tmp13, FIX(0.398430003)); /* c9 */ |
---|
1316 | tmp2 += tmp4 + tmp10 - MULTIPLY(tmp12, FIX(1.989053629)) /* c9+c5+c3-c7 */ |
---|
1317 | + MULTIPLY(tmp14, FIX(1.399818907)); /* c1 */ |
---|
1318 | tmp3 += tmp5 + tmp10 + MULTIPLY(tmp13, FIX(1.305598626)) /* c1+c5-c9-c7 */ |
---|
1319 | - MULTIPLY(tmp14, FIX(1.286413905)); /* c3 */ |
---|
1320 | |
---|
1321 | dataptr[1] = (DCTELEM) DESCALE(tmp0, CONST_BITS-1); |
---|
1322 | dataptr[3] = (DCTELEM) DESCALE(tmp1, CONST_BITS-1); |
---|
1323 | dataptr[5] = (DCTELEM) DESCALE(tmp2, CONST_BITS-1); |
---|
1324 | dataptr[7] = (DCTELEM) DESCALE(tmp3, CONST_BITS-1); |
---|
1325 | |
---|
1326 | ctr++; |
---|
1327 | |
---|
1328 | if (ctr != DCTSIZE) { |
---|
1329 | if (ctr == 11) |
---|
1330 | break; /* Done. */ |
---|
1331 | dataptr += DCTSIZE; /* advance pointer to next row */ |
---|
1332 | } else |
---|
1333 | dataptr = workspace; /* switch pointer to extended workspace */ |
---|
1334 | } |
---|
1335 | |
---|
1336 | /* Pass 2: process columns. |
---|
1337 | * We leave the results scaled up by an overall factor of 8. |
---|
1338 | * We must also scale the output by (8/11)**2 = 64/121, which we partially |
---|
1339 | * fold into the constant multipliers and final/initial shifting: |
---|
1340 | * cK now represents sqrt(2) * cos(K*pi/22) * 128/121. |
---|
1341 | */ |
---|
1342 | |
---|
1343 | dataptr = data; |
---|
1344 | wsptr = workspace; |
---|
1345 | for (ctr = DCTSIZE-1; ctr >= 0; ctr--) { |
---|
1346 | /* Even part */ |
---|
1347 | |
---|
1348 | tmp0 = dataptr[DCTSIZE*0] + wsptr[DCTSIZE*2]; |
---|
1349 | tmp1 = dataptr[DCTSIZE*1] + wsptr[DCTSIZE*1]; |
---|
1350 | tmp2 = dataptr[DCTSIZE*2] + wsptr[DCTSIZE*0]; |
---|
1351 | tmp3 = dataptr[DCTSIZE*3] + dataptr[DCTSIZE*7]; |
---|
1352 | tmp4 = dataptr[DCTSIZE*4] + dataptr[DCTSIZE*6]; |
---|
1353 | tmp5 = dataptr[DCTSIZE*5]; |
---|
1354 | |
---|
1355 | tmp10 = dataptr[DCTSIZE*0] - wsptr[DCTSIZE*2]; |
---|
1356 | tmp11 = dataptr[DCTSIZE*1] - wsptr[DCTSIZE*1]; |
---|
1357 | tmp12 = dataptr[DCTSIZE*2] - wsptr[DCTSIZE*0]; |
---|
1358 | tmp13 = dataptr[DCTSIZE*3] - dataptr[DCTSIZE*7]; |
---|
1359 | tmp14 = dataptr[DCTSIZE*4] - dataptr[DCTSIZE*6]; |
---|
1360 | |
---|
1361 | dataptr[DCTSIZE*0] = (DCTELEM) |
---|
1362 | DESCALE(MULTIPLY(tmp0 + tmp1 + tmp2 + tmp3 + tmp4 + tmp5, |
---|
1363 | FIX(1.057851240)), /* 128/121 */ |
---|
1364 | CONST_BITS+2); |
---|
1365 | tmp5 += tmp5; |
---|
1366 | tmp0 -= tmp5; |
---|
1367 | tmp1 -= tmp5; |
---|
1368 | tmp2 -= tmp5; |
---|
1369 | tmp3 -= tmp5; |
---|
1370 | tmp4 -= tmp5; |
---|
1371 | z1 = MULTIPLY(tmp0 + tmp3, FIX(1.435427942)) + /* c2 */ |
---|
1372 | MULTIPLY(tmp2 + tmp4, FIX(0.212906922)); /* c10 */ |
---|
1373 | z2 = MULTIPLY(tmp1 - tmp3, FIX(0.979689713)); /* c6 */ |
---|
1374 | z3 = MULTIPLY(tmp0 - tmp1, FIX(1.258538479)); /* c4 */ |
---|
1375 | dataptr[DCTSIZE*2] = (DCTELEM) |
---|
1376 | DESCALE(z1 + z2 - MULTIPLY(tmp3, FIX(1.077210542)) /* c2+c8-c6 */ |
---|
1377 | - MULTIPLY(tmp4, FIX(1.471445400)), /* c4+c10 */ |
---|
1378 | CONST_BITS+2); |
---|
1379 | dataptr[DCTSIZE*4] = (DCTELEM) |
---|
1380 | DESCALE(z2 + z3 + MULTIPLY(tmp1, FIX(0.065941844)) /* c4-c6-c10 */ |
---|
1381 | - MULTIPLY(tmp2, FIX(1.435427942)) /* c2 */ |
---|
1382 | + MULTIPLY(tmp4, FIX(0.621472312)), /* c8 */ |
---|
1383 | CONST_BITS+2); |
---|
1384 | dataptr[DCTSIZE*6] = (DCTELEM) |
---|
1385 | DESCALE(z1 + z3 - MULTIPLY(tmp0, FIX(1.714276708)) /* c2+c4-c6 */ |
---|
1386 | - MULTIPLY(tmp2, FIX(0.834379234)), /* c8+c10 */ |
---|
1387 | CONST_BITS+2); |
---|
1388 | |
---|
1389 | /* Odd part */ |
---|
1390 | |
---|
1391 | tmp1 = MULTIPLY(tmp10 + tmp11, FIX(1.360834544)); /* c3 */ |
---|
1392 | tmp2 = MULTIPLY(tmp10 + tmp12, FIX(1.130622199)); /* c5 */ |
---|
1393 | tmp3 = MULTIPLY(tmp10 + tmp13, FIX(0.808813568)); /* c7 */ |
---|
1394 | tmp0 = tmp1 + tmp2 + tmp3 - MULTIPLY(tmp10, FIX(1.819470145)) /* c7+c5+c3-c1 */ |
---|
1395 | + MULTIPLY(tmp14, FIX(0.421479672)); /* c9 */ |
---|
1396 | tmp4 = MULTIPLY(tmp11 + tmp12, - FIX(0.808813568)); /* -c7 */ |
---|
1397 | tmp5 = MULTIPLY(tmp11 + tmp13, - FIX(1.480800167)); /* -c1 */ |
---|
1398 | tmp1 += tmp4 + tmp5 + MULTIPLY(tmp11, FIX(1.350258864)) /* c9+c7+c1-c3 */ |
---|
1399 | - MULTIPLY(tmp14, FIX(1.130622199)); /* c5 */ |
---|
1400 | tmp10 = MULTIPLY(tmp12 + tmp13, FIX(0.421479672)); /* c9 */ |
---|
1401 | tmp2 += tmp4 + tmp10 - MULTIPLY(tmp12, FIX(2.104122847)) /* c9+c5+c3-c7 */ |
---|
1402 | + MULTIPLY(tmp14, FIX(1.480800167)); /* c1 */ |
---|
1403 | tmp3 += tmp5 + tmp10 + MULTIPLY(tmp13, FIX(1.381129125)) /* c1+c5-c9-c7 */ |
---|
1404 | - MULTIPLY(tmp14, FIX(1.360834544)); /* c3 */ |
---|
1405 | |
---|
1406 | dataptr[DCTSIZE*1] = (DCTELEM) DESCALE(tmp0, CONST_BITS+2); |
---|
1407 | dataptr[DCTSIZE*3] = (DCTELEM) DESCALE(tmp1, CONST_BITS+2); |
---|
1408 | dataptr[DCTSIZE*5] = (DCTELEM) DESCALE(tmp2, CONST_BITS+2); |
---|
1409 | dataptr[DCTSIZE*7] = (DCTELEM) DESCALE(tmp3, CONST_BITS+2); |
---|
1410 | |
---|
1411 | dataptr++; /* advance pointer to next column */ |
---|
1412 | wsptr++; /* advance pointer to next column */ |
---|
1413 | } |
---|
1414 | } |
---|
1415 | |
---|
1416 | |
---|
1417 | /* |
---|
1418 | * Perform the forward DCT on a 12x12 sample block. |
---|
1419 | */ |
---|
1420 | |
---|
1421 | GLOBAL(void) |
---|
1422 | jpeg_fdct_12x12 (DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col) |
---|
1423 | { |
---|
1424 | INT32 tmp0, tmp1, tmp2, tmp3, tmp4, tmp5; |
---|
1425 | INT32 tmp10, tmp11, tmp12, tmp13, tmp14, tmp15; |
---|
1426 | DCTELEM workspace[8*4]; |
---|
1427 | DCTELEM *dataptr; |
---|
1428 | DCTELEM *wsptr; |
---|
1429 | JSAMPROW elemptr; |
---|
1430 | int ctr; |
---|
1431 | SHIFT_TEMPS |
---|
1432 | |
---|
1433 | /* Pass 1: process rows. */ |
---|
1434 | /* Note results are scaled up by sqrt(8) compared to a true DCT. */ |
---|
1435 | /* cK represents sqrt(2) * cos(K*pi/24). */ |
---|
1436 | |
---|
1437 | dataptr = data; |
---|
1438 | ctr = 0; |
---|
1439 | for (;;) { |
---|
1440 | elemptr = sample_data[ctr] + start_col; |
---|
1441 | |
---|
1442 | /* Even part */ |
---|
1443 | |
---|
1444 | tmp0 = GETJSAMPLE(elemptr[0]) + GETJSAMPLE(elemptr[11]); |
---|
1445 | tmp1 = GETJSAMPLE(elemptr[1]) + GETJSAMPLE(elemptr[10]); |
---|
1446 | tmp2 = GETJSAMPLE(elemptr[2]) + GETJSAMPLE(elemptr[9]); |
---|
1447 | tmp3 = GETJSAMPLE(elemptr[3]) + GETJSAMPLE(elemptr[8]); |
---|
1448 | tmp4 = GETJSAMPLE(elemptr[4]) + GETJSAMPLE(elemptr[7]); |
---|
1449 | tmp5 = GETJSAMPLE(elemptr[5]) + GETJSAMPLE(elemptr[6]); |
---|
1450 | |
---|
1451 | tmp10 = tmp0 + tmp5; |
---|
1452 | tmp13 = tmp0 - tmp5; |
---|
1453 | tmp11 = tmp1 + tmp4; |
---|
1454 | tmp14 = tmp1 - tmp4; |
---|
1455 | tmp12 = tmp2 + tmp3; |
---|
1456 | tmp15 = tmp2 - tmp3; |
---|
1457 | |
---|
1458 | tmp0 = GETJSAMPLE(elemptr[0]) - GETJSAMPLE(elemptr[11]); |
---|
1459 | tmp1 = GETJSAMPLE(elemptr[1]) - GETJSAMPLE(elemptr[10]); |
---|
1460 | tmp2 = GETJSAMPLE(elemptr[2]) - GETJSAMPLE(elemptr[9]); |
---|
1461 | tmp3 = GETJSAMPLE(elemptr[3]) - GETJSAMPLE(elemptr[8]); |
---|
1462 | tmp4 = GETJSAMPLE(elemptr[4]) - GETJSAMPLE(elemptr[7]); |
---|
1463 | tmp5 = GETJSAMPLE(elemptr[5]) - GETJSAMPLE(elemptr[6]); |
---|
1464 | |
---|
1465 | /* Apply unsigned->signed conversion */ |
---|
1466 | dataptr[0] = (DCTELEM) (tmp10 + tmp11 + tmp12 - 12 * CENTERJSAMPLE); |
---|
1467 | dataptr[6] = (DCTELEM) (tmp13 - tmp14 - tmp15); |
---|
1468 | dataptr[4] = (DCTELEM) |
---|
1469 | DESCALE(MULTIPLY(tmp10 - tmp12, FIX(1.224744871)), /* c4 */ |
---|
1470 | CONST_BITS); |
---|
1471 | dataptr[2] = (DCTELEM) |
---|
1472 | DESCALE(tmp14 - tmp15 + MULTIPLY(tmp13 + tmp15, FIX(1.366025404)), /* c2 */ |
---|
1473 | CONST_BITS); |
---|
1474 | |
---|
1475 | /* Odd part */ |
---|
1476 | |
---|
1477 | tmp10 = MULTIPLY(tmp1 + tmp4, FIX_0_541196100); /* c9 */ |
---|
1478 | tmp14 = tmp10 + MULTIPLY(tmp1, FIX_0_765366865); /* c3-c9 */ |
---|
1479 | tmp15 = tmp10 - MULTIPLY(tmp4, FIX_1_847759065); /* c3+c9 */ |
---|
1480 | tmp12 = MULTIPLY(tmp0 + tmp2, FIX(1.121971054)); /* c5 */ |
---|
1481 | tmp13 = MULTIPLY(tmp0 + tmp3, FIX(0.860918669)); /* c7 */ |
---|
1482 | tmp10 = tmp12 + tmp13 + tmp14 - MULTIPLY(tmp0, FIX(0.580774953)) /* c5+c7-c1 */ |
---|
1483 | + MULTIPLY(tmp5, FIX(0.184591911)); /* c11 */ |
---|
1484 | tmp11 = MULTIPLY(tmp2 + tmp3, - FIX(0.184591911)); /* -c11 */ |
---|
1485 | tmp12 += tmp11 - tmp15 - MULTIPLY(tmp2, FIX(2.339493912)) /* c1+c5-c11 */ |
---|
1486 | + MULTIPLY(tmp5, FIX(0.860918669)); /* c7 */ |
---|
1487 | tmp13 += tmp11 - tmp14 + MULTIPLY(tmp3, FIX(0.725788011)) /* c1+c11-c7 */ |
---|
1488 | - MULTIPLY(tmp5, FIX(1.121971054)); /* c5 */ |
---|
1489 | tmp11 = tmp15 + MULTIPLY(tmp0 - tmp3, FIX(1.306562965)) /* c3 */ |
---|
1490 | - MULTIPLY(tmp2 + tmp5, FIX_0_541196100); /* c9 */ |
---|
1491 | |
---|
1492 | dataptr[1] = (DCTELEM) DESCALE(tmp10, CONST_BITS); |
---|
1493 | dataptr[3] = (DCTELEM) DESCALE(tmp11, CONST_BITS); |
---|
1494 | dataptr[5] = (DCTELEM) DESCALE(tmp12, CONST_BITS); |
---|
1495 | dataptr[7] = (DCTELEM) DESCALE(tmp13, CONST_BITS); |
---|
1496 | |
---|
1497 | ctr++; |
---|
1498 | |
---|
1499 | if (ctr != DCTSIZE) { |
---|
1500 | if (ctr == 12) |
---|
1501 | break; /* Done. */ |
---|
1502 | dataptr += DCTSIZE; /* advance pointer to next row */ |
---|
1503 | } else |
---|
1504 | dataptr = workspace; /* switch pointer to extended workspace */ |
---|
1505 | } |
---|
1506 | |
---|
1507 | /* Pass 2: process columns. |
---|
1508 | * We leave the results scaled up by an overall factor of 8. |
---|
1509 | * We must also scale the output by (8/12)**2 = 4/9, which we partially |
---|
1510 | * fold into the constant multipliers and final shifting: |
---|
1511 | * cK now represents sqrt(2) * cos(K*pi/24) * 8/9. |
---|
1512 | */ |
---|
1513 | |
---|
1514 | dataptr = data; |
---|
1515 | wsptr = workspace; |
---|
1516 | for (ctr = DCTSIZE-1; ctr >= 0; ctr--) { |
---|
1517 | /* Even part */ |
---|
1518 | |
---|
1519 | tmp0 = dataptr[DCTSIZE*0] + wsptr[DCTSIZE*3]; |
---|
1520 | tmp1 = dataptr[DCTSIZE*1] + wsptr[DCTSIZE*2]; |
---|
1521 | tmp2 = dataptr[DCTSIZE*2] + wsptr[DCTSIZE*1]; |
---|
1522 | tmp3 = dataptr[DCTSIZE*3] + wsptr[DCTSIZE*0]; |
---|
1523 | tmp4 = dataptr[DCTSIZE*4] + dataptr[DCTSIZE*7]; |
---|
1524 | tmp5 = dataptr[DCTSIZE*5] + dataptr[DCTSIZE*6]; |
---|
1525 | |
---|
1526 | tmp10 = tmp0 + tmp5; |
---|
1527 | tmp13 = tmp0 - tmp5; |
---|
1528 | tmp11 = tmp1 + tmp4; |
---|
1529 | tmp14 = tmp1 - tmp4; |
---|
1530 | tmp12 = tmp2 + tmp3; |
---|
1531 | tmp15 = tmp2 - tmp3; |
---|
1532 | |
---|
1533 | tmp0 = dataptr[DCTSIZE*0] - wsptr[DCTSIZE*3]; |
---|
1534 | tmp1 = dataptr[DCTSIZE*1] - wsptr[DCTSIZE*2]; |
---|
1535 | tmp2 = dataptr[DCTSIZE*2] - wsptr[DCTSIZE*1]; |
---|
1536 | tmp3 = dataptr[DCTSIZE*3] - wsptr[DCTSIZE*0]; |
---|
1537 | tmp4 = dataptr[DCTSIZE*4] - dataptr[DCTSIZE*7]; |
---|
1538 | tmp5 = dataptr[DCTSIZE*5] - dataptr[DCTSIZE*6]; |
---|
1539 | |
---|
1540 | dataptr[DCTSIZE*0] = (DCTELEM) |
---|
1541 | DESCALE(MULTIPLY(tmp10 + tmp11 + tmp12, FIX(0.888888889)), /* 8/9 */ |
---|
1542 | CONST_BITS+1); |
---|
1543 | dataptr[DCTSIZE*6] = (DCTELEM) |
---|
1544 | DESCALE(MULTIPLY(tmp13 - tmp14 - tmp15, FIX(0.888888889)), /* 8/9 */ |
---|
1545 | CONST_BITS+1); |
---|
1546 | dataptr[DCTSIZE*4] = (DCTELEM) |
---|
1547 | DESCALE(MULTIPLY(tmp10 - tmp12, FIX(1.088662108)), /* c4 */ |
---|
1548 | CONST_BITS+1); |
---|
1549 | dataptr[DCTSIZE*2] = (DCTELEM) |
---|
1550 | DESCALE(MULTIPLY(tmp14 - tmp15, FIX(0.888888889)) + /* 8/9 */ |
---|
1551 | MULTIPLY(tmp13 + tmp15, FIX(1.214244803)), /* c2 */ |
---|
1552 | CONST_BITS+1); |
---|
1553 | |
---|
1554 | /* Odd part */ |
---|
1555 | |
---|
1556 | tmp10 = MULTIPLY(tmp1 + tmp4, FIX(0.481063200)); /* c9 */ |
---|
1557 | tmp14 = tmp10 + MULTIPLY(tmp1, FIX(0.680326102)); /* c3-c9 */ |
---|
1558 | tmp15 = tmp10 - MULTIPLY(tmp4, FIX(1.642452502)); /* c3+c9 */ |
---|
1559 | tmp12 = MULTIPLY(tmp0 + tmp2, FIX(0.997307603)); /* c5 */ |
---|
1560 | tmp13 = MULTIPLY(tmp0 + tmp3, FIX(0.765261039)); /* c7 */ |
---|
1561 | tmp10 = tmp12 + tmp13 + tmp14 - MULTIPLY(tmp0, FIX(0.516244403)) /* c5+c7-c1 */ |
---|
1562 | + MULTIPLY(tmp5, FIX(0.164081699)); /* c11 */ |
---|
1563 | tmp11 = MULTIPLY(tmp2 + tmp3, - FIX(0.164081699)); /* -c11 */ |
---|
1564 | tmp12 += tmp11 - tmp15 - MULTIPLY(tmp2, FIX(2.079550144)) /* c1+c5-c11 */ |
---|
1565 | + MULTIPLY(tmp5, FIX(0.765261039)); /* c7 */ |
---|
1566 | tmp13 += tmp11 - tmp14 + MULTIPLY(tmp3, FIX(0.645144899)) /* c1+c11-c7 */ |
---|
1567 | - MULTIPLY(tmp5, FIX(0.997307603)); /* c5 */ |
---|
1568 | tmp11 = tmp15 + MULTIPLY(tmp0 - tmp3, FIX(1.161389302)) /* c3 */ |
---|
1569 | - MULTIPLY(tmp2 + tmp5, FIX(0.481063200)); /* c9 */ |
---|
1570 | |
---|
1571 | dataptr[DCTSIZE*1] = (DCTELEM) DESCALE(tmp10, CONST_BITS+1); |
---|
1572 | dataptr[DCTSIZE*3] = (DCTELEM) DESCALE(tmp11, CONST_BITS+1); |
---|
1573 | dataptr[DCTSIZE*5] = (DCTELEM) DESCALE(tmp12, CONST_BITS+1); |
---|
1574 | dataptr[DCTSIZE*7] = (DCTELEM) DESCALE(tmp13, CONST_BITS+1); |
---|
1575 | |
---|
1576 | dataptr++; /* advance pointer to next column */ |
---|
1577 | wsptr++; /* advance pointer to next column */ |
---|
1578 | } |
---|
1579 | } |
---|
1580 | |
---|
1581 | |
---|
1582 | /* |
---|
1583 | * Perform the forward DCT on a 13x13 sample block. |
---|
1584 | */ |
---|
1585 | |
---|
1586 | GLOBAL(void) |
---|
1587 | jpeg_fdct_13x13 (DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col) |
---|
1588 | { |
---|
1589 | INT32 tmp0, tmp1, tmp2, tmp3, tmp4, tmp5, tmp6; |
---|
1590 | INT32 tmp10, tmp11, tmp12, tmp13, tmp14, tmp15; |
---|
1591 | INT32 z1, z2; |
---|
1592 | DCTELEM workspace[8*5]; |
---|
1593 | DCTELEM *dataptr; |
---|
1594 | DCTELEM *wsptr; |
---|
1595 | JSAMPROW elemptr; |
---|
1596 | int ctr; |
---|
1597 | SHIFT_TEMPS |
---|
1598 | |
---|
1599 | /* Pass 1: process rows. */ |
---|
1600 | /* Note results are scaled up by sqrt(8) compared to a true DCT. */ |
---|
1601 | /* cK represents sqrt(2) * cos(K*pi/26). */ |
---|
1602 | |
---|
1603 | dataptr = data; |
---|
1604 | ctr = 0; |
---|
1605 | for (;;) { |
---|
1606 | elemptr = sample_data[ctr] + start_col; |
---|
1607 | |
---|
1608 | /* Even part */ |
---|
1609 | |
---|
1610 | tmp0 = GETJSAMPLE(elemptr[0]) + GETJSAMPLE(elemptr[12]); |
---|
1611 | tmp1 = GETJSAMPLE(elemptr[1]) + GETJSAMPLE(elemptr[11]); |
---|
1612 | tmp2 = GETJSAMPLE(elemptr[2]) + GETJSAMPLE(elemptr[10]); |
---|
1613 | tmp3 = GETJSAMPLE(elemptr[3]) + GETJSAMPLE(elemptr[9]); |
---|
1614 | tmp4 = GETJSAMPLE(elemptr[4]) + GETJSAMPLE(elemptr[8]); |
---|
1615 | tmp5 = GETJSAMPLE(elemptr[5]) + GETJSAMPLE(elemptr[7]); |
---|
1616 | tmp6 = GETJSAMPLE(elemptr[6]); |
---|
1617 | |
---|
1618 | tmp10 = GETJSAMPLE(elemptr[0]) - GETJSAMPLE(elemptr[12]); |
---|
1619 | tmp11 = GETJSAMPLE(elemptr[1]) - GETJSAMPLE(elemptr[11]); |
---|
1620 | tmp12 = GETJSAMPLE(elemptr[2]) - GETJSAMPLE(elemptr[10]); |
---|
1621 | tmp13 = GETJSAMPLE(elemptr[3]) - GETJSAMPLE(elemptr[9]); |
---|
1622 | tmp14 = GETJSAMPLE(elemptr[4]) - GETJSAMPLE(elemptr[8]); |
---|
1623 | tmp15 = GETJSAMPLE(elemptr[5]) - GETJSAMPLE(elemptr[7]); |
---|
1624 | |
---|
1625 | /* Apply unsigned->signed conversion */ |
---|
1626 | dataptr[0] = (DCTELEM) |
---|
1627 | (tmp0 + tmp1 + tmp2 + tmp3 + tmp4 + tmp5 + tmp6 - 13 * CENTERJSAMPLE); |
---|
1628 | tmp6 += tmp6; |
---|
1629 | tmp0 -= tmp6; |
---|
1630 | tmp1 -= tmp6; |
---|
1631 | tmp2 -= tmp6; |
---|
1632 | tmp3 -= tmp6; |
---|
1633 | tmp4 -= tmp6; |
---|
1634 | tmp5 -= tmp6; |
---|
1635 | dataptr[2] = (DCTELEM) |
---|
1636 | DESCALE(MULTIPLY(tmp0, FIX(1.373119086)) + /* c2 */ |
---|
1637 | MULTIPLY(tmp1, FIX(1.058554052)) + /* c6 */ |
---|
1638 | MULTIPLY(tmp2, FIX(0.501487041)) - /* c10 */ |
---|
1639 | MULTIPLY(tmp3, FIX(0.170464608)) - /* c12 */ |
---|
1640 | MULTIPLY(tmp4, FIX(0.803364869)) - /* c8 */ |
---|
1641 | MULTIPLY(tmp5, FIX(1.252223920)), /* c4 */ |
---|
1642 | CONST_BITS); |
---|
1643 | z1 = MULTIPLY(tmp0 - tmp2, FIX(1.155388986)) - /* (c4+c6)/2 */ |
---|
1644 | MULTIPLY(tmp3 - tmp4, FIX(0.435816023)) - /* (c2-c10)/2 */ |
---|
1645 | MULTIPLY(tmp1 - tmp5, FIX(0.316450131)); /* (c8-c12)/2 */ |
---|
1646 | z2 = MULTIPLY(tmp0 + tmp2, FIX(0.096834934)) - /* (c4-c6)/2 */ |
---|
1647 | MULTIPLY(tmp3 + tmp4, FIX(0.937303064)) + /* (c2+c10)/2 */ |
---|
1648 | MULTIPLY(tmp1 + tmp5, FIX(0.486914739)); /* (c8+c12)/2 */ |
---|
1649 | |
---|
1650 | dataptr[4] = (DCTELEM) DESCALE(z1 + z2, CONST_BITS); |
---|
1651 | dataptr[6] = (DCTELEM) DESCALE(z1 - z2, CONST_BITS); |
---|
1652 | |
---|
1653 | /* Odd part */ |
---|
1654 | |
---|
1655 | tmp1 = MULTIPLY(tmp10 + tmp11, FIX(1.322312651)); /* c3 */ |
---|
1656 | tmp2 = MULTIPLY(tmp10 + tmp12, FIX(1.163874945)); /* c5 */ |
---|
1657 | tmp3 = MULTIPLY(tmp10 + tmp13, FIX(0.937797057)) + /* c7 */ |
---|
1658 | MULTIPLY(tmp14 + tmp15, FIX(0.338443458)); /* c11 */ |
---|
1659 | tmp0 = tmp1 + tmp2 + tmp3 - |
---|
1660 | MULTIPLY(tmp10, FIX(2.020082300)) + /* c3+c5+c7-c1 */ |
---|
1661 | MULTIPLY(tmp14, FIX(0.318774355)); /* c9-c11 */ |
---|
1662 | tmp4 = MULTIPLY(tmp14 - tmp15, FIX(0.937797057)) - /* c7 */ |
---|
1663 | MULTIPLY(tmp11 + tmp12, FIX(0.338443458)); /* c11 */ |
---|
1664 | tmp5 = MULTIPLY(tmp11 + tmp13, - FIX(1.163874945)); /* -c5 */ |
---|
1665 | tmp1 += tmp4 + tmp5 + |
---|
1666 | MULTIPLY(tmp11, FIX(0.837223564)) - /* c5+c9+c11-c3 */ |
---|
1667 | MULTIPLY(tmp14, FIX(2.341699410)); /* c1+c7 */ |
---|
1668 | tmp6 = MULTIPLY(tmp12 + tmp13, - FIX(0.657217813)); /* -c9 */ |
---|
1669 | tmp2 += tmp4 + tmp6 - |
---|
1670 | MULTIPLY(tmp12, FIX(1.572116027)) + /* c1+c5-c9-c11 */ |
---|
1671 | MULTIPLY(tmp15, FIX(2.260109708)); /* c3+c7 */ |
---|
1672 | tmp3 += tmp5 + tmp6 + |
---|
1673 | MULTIPLY(tmp13, FIX(2.205608352)) - /* c3+c5+c9-c7 */ |
---|
1674 | MULTIPLY(tmp15, FIX(1.742345811)); /* c1+c11 */ |
---|
1675 | |
---|
1676 | dataptr[1] = (DCTELEM) DESCALE(tmp0, CONST_BITS); |
---|
1677 | dataptr[3] = (DCTELEM) DESCALE(tmp1, CONST_BITS); |
---|
1678 | dataptr[5] = (DCTELEM) DESCALE(tmp2, CONST_BITS); |
---|
1679 | dataptr[7] = (DCTELEM) DESCALE(tmp3, CONST_BITS); |
---|
1680 | |
---|
1681 | ctr++; |
---|
1682 | |
---|
1683 | if (ctr != DCTSIZE) { |
---|
1684 | if (ctr == 13) |
---|
1685 | break; /* Done. */ |
---|
1686 | dataptr += DCTSIZE; /* advance pointer to next row */ |
---|
1687 | } else |
---|
1688 | dataptr = workspace; /* switch pointer to extended workspace */ |
---|
1689 | } |
---|
1690 | |
---|
1691 | /* Pass 2: process columns. |
---|
1692 | * We leave the results scaled up by an overall factor of 8. |
---|
1693 | * We must also scale the output by (8/13)**2 = 64/169, which we partially |
---|
1694 | * fold into the constant multipliers and final shifting: |
---|
1695 | * cK now represents sqrt(2) * cos(K*pi/26) * 128/169. |
---|
1696 | */ |
---|
1697 | |
---|
1698 | dataptr = data; |
---|
1699 | wsptr = workspace; |
---|
1700 | for (ctr = DCTSIZE-1; ctr >= 0; ctr--) { |
---|
1701 | /* Even part */ |
---|
1702 | |
---|
1703 | tmp0 = dataptr[DCTSIZE*0] + wsptr[DCTSIZE*4]; |
---|
1704 | tmp1 = dataptr[DCTSIZE*1] + wsptr[DCTSIZE*3]; |
---|
1705 | tmp2 = dataptr[DCTSIZE*2] + wsptr[DCTSIZE*2]; |
---|
1706 | tmp3 = dataptr[DCTSIZE*3] + wsptr[DCTSIZE*1]; |
---|
1707 | tmp4 = dataptr[DCTSIZE*4] + wsptr[DCTSIZE*0]; |
---|
1708 | tmp5 = dataptr[DCTSIZE*5] + dataptr[DCTSIZE*7]; |
---|
1709 | tmp6 = dataptr[DCTSIZE*6]; |
---|
1710 | |
---|
1711 | tmp10 = dataptr[DCTSIZE*0] - wsptr[DCTSIZE*4]; |
---|
1712 | tmp11 = dataptr[DCTSIZE*1] - wsptr[DCTSIZE*3]; |
---|
1713 | tmp12 = dataptr[DCTSIZE*2] - wsptr[DCTSIZE*2]; |
---|
1714 | tmp13 = dataptr[DCTSIZE*3] - wsptr[DCTSIZE*1]; |
---|
1715 | tmp14 = dataptr[DCTSIZE*4] - wsptr[DCTSIZE*0]; |
---|
1716 | tmp15 = dataptr[DCTSIZE*5] - dataptr[DCTSIZE*7]; |
---|
1717 | |
---|
1718 | dataptr[DCTSIZE*0] = (DCTELEM) |
---|
1719 | DESCALE(MULTIPLY(tmp0 + tmp1 + tmp2 + tmp3 + tmp4 + tmp5 + tmp6, |
---|
1720 | FIX(0.757396450)), /* 128/169 */ |
---|
1721 | CONST_BITS+1); |
---|
1722 | tmp6 += tmp6; |
---|
1723 | tmp0 -= tmp6; |
---|
1724 | tmp1 -= tmp6; |
---|
1725 | tmp2 -= tmp6; |
---|
1726 | tmp3 -= tmp6; |
---|
1727 | tmp4 -= tmp6; |
---|
1728 | tmp5 -= tmp6; |
---|
1729 | dataptr[DCTSIZE*2] = (DCTELEM) |
---|
1730 | DESCALE(MULTIPLY(tmp0, FIX(1.039995521)) + /* c2 */ |
---|
1731 | MULTIPLY(tmp1, FIX(0.801745081)) + /* c6 */ |
---|
1732 | MULTIPLY(tmp2, FIX(0.379824504)) - /* c10 */ |
---|
1733 | MULTIPLY(tmp3, FIX(0.129109289)) - /* c12 */ |
---|
1734 | MULTIPLY(tmp4, FIX(0.608465700)) - /* c8 */ |
---|
1735 | MULTIPLY(tmp5, FIX(0.948429952)), /* c4 */ |
---|
1736 | CONST_BITS+1); |
---|
1737 | z1 = MULTIPLY(tmp0 - tmp2, FIX(0.875087516)) - /* (c4+c6)/2 */ |
---|
1738 | MULTIPLY(tmp3 - tmp4, FIX(0.330085509)) - /* (c2-c10)/2 */ |
---|
1739 | MULTIPLY(tmp1 - tmp5, FIX(0.239678205)); /* (c8-c12)/2 */ |
---|
1740 | z2 = MULTIPLY(tmp0 + tmp2, FIX(0.073342435)) - /* (c4-c6)/2 */ |
---|
1741 | MULTIPLY(tmp3 + tmp4, FIX(0.709910013)) + /* (c2+c10)/2 */ |
---|
1742 | MULTIPLY(tmp1 + tmp5, FIX(0.368787494)); /* (c8+c12)/2 */ |
---|
1743 | |
---|
1744 | dataptr[DCTSIZE*4] = (DCTELEM) DESCALE(z1 + z2, CONST_BITS+1); |
---|
1745 | dataptr[DCTSIZE*6] = (DCTELEM) DESCALE(z1 - z2, CONST_BITS+1); |
---|
1746 | |
---|
1747 | /* Odd part */ |
---|
1748 | |
---|
1749 | tmp1 = MULTIPLY(tmp10 + tmp11, FIX(1.001514908)); /* c3 */ |
---|
1750 | tmp2 = MULTIPLY(tmp10 + tmp12, FIX(0.881514751)); /* c5 */ |
---|
1751 | tmp3 = MULTIPLY(tmp10 + tmp13, FIX(0.710284161)) + /* c7 */ |
---|
1752 | MULTIPLY(tmp14 + tmp15, FIX(0.256335874)); /* c11 */ |
---|
1753 | tmp0 = tmp1 + tmp2 + tmp3 - |
---|
1754 | MULTIPLY(tmp10, FIX(1.530003162)) + /* c3+c5+c7-c1 */ |
---|
1755 | MULTIPLY(tmp14, FIX(0.241438564)); /* c9-c11 */ |
---|
1756 | tmp4 = MULTIPLY(tmp14 - tmp15, FIX(0.710284161)) - /* c7 */ |
---|
1757 | MULTIPLY(tmp11 + tmp12, FIX(0.256335874)); /* c11 */ |
---|
1758 | tmp5 = MULTIPLY(tmp11 + tmp13, - FIX(0.881514751)); /* -c5 */ |
---|
1759 | tmp1 += tmp4 + tmp5 + |
---|
1760 | MULTIPLY(tmp11, FIX(0.634110155)) - /* c5+c9+c11-c3 */ |
---|
1761 | MULTIPLY(tmp14, FIX(1.773594819)); /* c1+c7 */ |
---|
1762 | tmp6 = MULTIPLY(tmp12 + tmp13, - FIX(0.497774438)); /* -c9 */ |
---|
1763 | tmp2 += tmp4 + tmp6 - |
---|
1764 | MULTIPLY(tmp12, FIX(1.190715098)) + /* c1+c5-c9-c11 */ |
---|
1765 | MULTIPLY(tmp15, FIX(1.711799069)); /* c3+c7 */ |
---|
1766 | tmp3 += tmp5 + tmp6 + |
---|
1767 | MULTIPLY(tmp13, FIX(1.670519935)) - /* c3+c5+c9-c7 */ |
---|
1768 | MULTIPLY(tmp15, FIX(1.319646532)); /* c1+c11 */ |
---|
1769 | |
---|
1770 | dataptr[DCTSIZE*1] = (DCTELEM) DESCALE(tmp0, CONST_BITS+1); |
---|
1771 | dataptr[DCTSIZE*3] = (DCTELEM) DESCALE(tmp1, CONST_BITS+1); |
---|
1772 | dataptr[DCTSIZE*5] = (DCTELEM) DESCALE(tmp2, CONST_BITS+1); |
---|
1773 | dataptr[DCTSIZE*7] = (DCTELEM) DESCALE(tmp3, CONST_BITS+1); |
---|
1774 | |
---|
1775 | dataptr++; /* advance pointer to next column */ |
---|
1776 | wsptr++; /* advance pointer to next column */ |
---|
1777 | } |
---|
1778 | } |
---|
1779 | |
---|
1780 | |
---|
1781 | /* |
---|
1782 | * Perform the forward DCT on a 14x14 sample block. |
---|
1783 | */ |
---|
1784 | |
---|
1785 | GLOBAL(void) |
---|
1786 | jpeg_fdct_14x14 (DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col) |
---|
1787 | { |
---|
1788 | INT32 tmp0, tmp1, tmp2, tmp3, tmp4, tmp5, tmp6; |
---|
1789 | INT32 tmp10, tmp11, tmp12, tmp13, tmp14, tmp15, tmp16; |
---|
1790 | DCTELEM workspace[8*6]; |
---|
1791 | DCTELEM *dataptr; |
---|
1792 | DCTELEM *wsptr; |
---|
1793 | JSAMPROW elemptr; |
---|
1794 | int ctr; |
---|
1795 | SHIFT_TEMPS |
---|
1796 | |
---|
1797 | /* Pass 1: process rows. */ |
---|
1798 | /* Note results are scaled up by sqrt(8) compared to a true DCT. */ |
---|
1799 | /* cK represents sqrt(2) * cos(K*pi/28). */ |
---|
1800 | |
---|
1801 | dataptr = data; |
---|
1802 | ctr = 0; |
---|
1803 | for (;;) { |
---|
1804 | elemptr = sample_data[ctr] + start_col; |
---|
1805 | |
---|
1806 | /* Even part */ |
---|
1807 | |
---|
1808 | tmp0 = GETJSAMPLE(elemptr[0]) + GETJSAMPLE(elemptr[13]); |
---|
1809 | tmp1 = GETJSAMPLE(elemptr[1]) + GETJSAMPLE(elemptr[12]); |
---|
1810 | tmp2 = GETJSAMPLE(elemptr[2]) + GETJSAMPLE(elemptr[11]); |
---|
1811 | tmp13 = GETJSAMPLE(elemptr[3]) + GETJSAMPLE(elemptr[10]); |
---|
1812 | tmp4 = GETJSAMPLE(elemptr[4]) + GETJSAMPLE(elemptr[9]); |
---|
1813 | tmp5 = GETJSAMPLE(elemptr[5]) + GETJSAMPLE(elemptr[8]); |
---|
1814 | tmp6 = GETJSAMPLE(elemptr[6]) + GETJSAMPLE(elemptr[7]); |
---|
1815 | |
---|
1816 | tmp10 = tmp0 + tmp6; |
---|
1817 | tmp14 = tmp0 - tmp6; |
---|
1818 | tmp11 = tmp1 + tmp5; |
---|
1819 | tmp15 = tmp1 - tmp5; |
---|
1820 | tmp12 = tmp2 + tmp4; |
---|
1821 | tmp16 = tmp2 - tmp4; |
---|
1822 | |
---|
1823 | tmp0 = GETJSAMPLE(elemptr[0]) - GETJSAMPLE(elemptr[13]); |
---|
1824 | tmp1 = GETJSAMPLE(elemptr[1]) - GETJSAMPLE(elemptr[12]); |
---|
1825 | tmp2 = GETJSAMPLE(elemptr[2]) - GETJSAMPLE(elemptr[11]); |
---|
1826 | tmp3 = GETJSAMPLE(elemptr[3]) - GETJSAMPLE(elemptr[10]); |
---|
1827 | tmp4 = GETJSAMPLE(elemptr[4]) - GETJSAMPLE(elemptr[9]); |
---|
1828 | tmp5 = GETJSAMPLE(elemptr[5]) - GETJSAMPLE(elemptr[8]); |
---|
1829 | tmp6 = GETJSAMPLE(elemptr[6]) - GETJSAMPLE(elemptr[7]); |
---|
1830 | |
---|
1831 | /* Apply unsigned->signed conversion */ |
---|
1832 | dataptr[0] = (DCTELEM) |
---|
1833 | (tmp10 + tmp11 + tmp12 + tmp13 - 14 * CENTERJSAMPLE); |
---|
1834 | tmp13 += tmp13; |
---|
1835 | dataptr[4] = (DCTELEM) |
---|
1836 | DESCALE(MULTIPLY(tmp10 - tmp13, FIX(1.274162392)) + /* c4 */ |
---|
1837 | MULTIPLY(tmp11 - tmp13, FIX(0.314692123)) - /* c12 */ |
---|
1838 | MULTIPLY(tmp12 - tmp13, FIX(0.881747734)), /* c8 */ |
---|
1839 | CONST_BITS); |
---|
1840 | |
---|
1841 | tmp10 = MULTIPLY(tmp14 + tmp15, FIX(1.105676686)); /* c6 */ |
---|
1842 | |
---|
1843 | dataptr[2] = (DCTELEM) |
---|
1844 | DESCALE(tmp10 + MULTIPLY(tmp14, FIX(0.273079590)) /* c2-c6 */ |
---|
1845 | + MULTIPLY(tmp16, FIX(0.613604268)), /* c10 */ |
---|
1846 | CONST_BITS); |
---|
1847 | dataptr[6] = (DCTELEM) |
---|
1848 | DESCALE(tmp10 - MULTIPLY(tmp15, FIX(1.719280954)) /* c6+c10 */ |
---|
1849 | - MULTIPLY(tmp16, FIX(1.378756276)), /* c2 */ |
---|
1850 | CONST_BITS); |
---|
1851 | |
---|
1852 | /* Odd part */ |
---|
1853 | |
---|
1854 | tmp10 = tmp1 + tmp2; |
---|
1855 | tmp11 = tmp5 - tmp4; |
---|
1856 | dataptr[7] = (DCTELEM) (tmp0 - tmp10 + tmp3 - tmp11 - tmp6); |
---|
1857 | tmp3 <<= CONST_BITS; |
---|
1858 | tmp10 = MULTIPLY(tmp10, - FIX(0.158341681)); /* -c13 */ |
---|
1859 | tmp11 = MULTIPLY(tmp11, FIX(1.405321284)); /* c1 */ |
---|
1860 | tmp10 += tmp11 - tmp3; |
---|
1861 | tmp11 = MULTIPLY(tmp0 + tmp2, FIX(1.197448846)) + /* c5 */ |
---|
1862 | MULTIPLY(tmp4 + tmp6, FIX(0.752406978)); /* c9 */ |
---|
1863 | dataptr[5] = (DCTELEM) |
---|
1864 | DESCALE(tmp10 + tmp11 - MULTIPLY(tmp2, FIX(2.373959773)) /* c3+c5-c13 */ |
---|
1865 | + MULTIPLY(tmp4, FIX(1.119999435)), /* c1+c11-c9 */ |
---|
1866 | CONST_BITS); |
---|
1867 | tmp12 = MULTIPLY(tmp0 + tmp1, FIX(1.334852607)) + /* c3 */ |
---|
1868 | MULTIPLY(tmp5 - tmp6, FIX(0.467085129)); /* c11 */ |
---|
1869 | dataptr[3] = (DCTELEM) |
---|
1870 | DESCALE(tmp10 + tmp12 - MULTIPLY(tmp1, FIX(0.424103948)) /* c3-c9-c13 */ |
---|
1871 | - MULTIPLY(tmp5, FIX(3.069855259)), /* c1+c5+c11 */ |
---|
1872 | CONST_BITS); |
---|
1873 | dataptr[1] = (DCTELEM) |
---|
1874 | DESCALE(tmp11 + tmp12 + tmp3 + tmp6 - |
---|
1875 | MULTIPLY(tmp0 + tmp6, FIX(1.126980169)), /* c3+c5-c1 */ |
---|
1876 | CONST_BITS); |
---|
1877 | |
---|
1878 | ctr++; |
---|
1879 | |
---|
1880 | if (ctr != DCTSIZE) { |
---|
1881 | if (ctr == 14) |
---|
1882 | break; /* Done. */ |
---|
1883 | dataptr += DCTSIZE; /* advance pointer to next row */ |
---|
1884 | } else |
---|
1885 | dataptr = workspace; /* switch pointer to extended workspace */ |
---|
1886 | } |
---|
1887 | |
---|
1888 | /* Pass 2: process columns. |
---|
1889 | * We leave the results scaled up by an overall factor of 8. |
---|
1890 | * We must also scale the output by (8/14)**2 = 16/49, which we partially |
---|
1891 | * fold into the constant multipliers and final shifting: |
---|
1892 | * cK now represents sqrt(2) * cos(K*pi/28) * 32/49. |
---|
1893 | */ |
---|
1894 | |
---|
1895 | dataptr = data; |
---|
1896 | wsptr = workspace; |
---|
1897 | for (ctr = DCTSIZE-1; ctr >= 0; ctr--) { |
---|
1898 | /* Even part */ |
---|
1899 | |
---|
1900 | tmp0 = dataptr[DCTSIZE*0] + wsptr[DCTSIZE*5]; |
---|
1901 | tmp1 = dataptr[DCTSIZE*1] + wsptr[DCTSIZE*4]; |
---|
1902 | tmp2 = dataptr[DCTSIZE*2] + wsptr[DCTSIZE*3]; |
---|
1903 | tmp13 = dataptr[DCTSIZE*3] + wsptr[DCTSIZE*2]; |
---|
1904 | tmp4 = dataptr[DCTSIZE*4] + wsptr[DCTSIZE*1]; |
---|
1905 | tmp5 = dataptr[DCTSIZE*5] + wsptr[DCTSIZE*0]; |
---|
1906 | tmp6 = dataptr[DCTSIZE*6] + dataptr[DCTSIZE*7]; |
---|
1907 | |
---|
1908 | tmp10 = tmp0 + tmp6; |
---|
1909 | tmp14 = tmp0 - tmp6; |
---|
1910 | tmp11 = tmp1 + tmp5; |
---|
1911 | tmp15 = tmp1 - tmp5; |
---|
1912 | tmp12 = tmp2 + tmp4; |
---|
1913 | tmp16 = tmp2 - tmp4; |
---|
1914 | |
---|
1915 | tmp0 = dataptr[DCTSIZE*0] - wsptr[DCTSIZE*5]; |
---|
1916 | tmp1 = dataptr[DCTSIZE*1] - wsptr[DCTSIZE*4]; |
---|
1917 | tmp2 = dataptr[DCTSIZE*2] - wsptr[DCTSIZE*3]; |
---|
1918 | tmp3 = dataptr[DCTSIZE*3] - wsptr[DCTSIZE*2]; |
---|
1919 | tmp4 = dataptr[DCTSIZE*4] - wsptr[DCTSIZE*1]; |
---|
1920 | tmp5 = dataptr[DCTSIZE*5] - wsptr[DCTSIZE*0]; |
---|
1921 | tmp6 = dataptr[DCTSIZE*6] - dataptr[DCTSIZE*7]; |
---|
1922 | |
---|
1923 | dataptr[DCTSIZE*0] = (DCTELEM) |
---|
1924 | DESCALE(MULTIPLY(tmp10 + tmp11 + tmp12 + tmp13, |
---|
1925 | FIX(0.653061224)), /* 32/49 */ |
---|
1926 | CONST_BITS+1); |
---|
1927 | tmp13 += tmp13; |
---|
1928 | dataptr[DCTSIZE*4] = (DCTELEM) |
---|
1929 | DESCALE(MULTIPLY(tmp10 - tmp13, FIX(0.832106052)) + /* c4 */ |
---|
1930 | MULTIPLY(tmp11 - tmp13, FIX(0.205513223)) - /* c12 */ |
---|
1931 | MULTIPLY(tmp12 - tmp13, FIX(0.575835255)), /* c8 */ |
---|
1932 | CONST_BITS+1); |
---|
1933 | |
---|
1934 | tmp10 = MULTIPLY(tmp14 + tmp15, FIX(0.722074570)); /* c6 */ |
---|
1935 | |
---|
1936 | dataptr[DCTSIZE*2] = (DCTELEM) |
---|
1937 | DESCALE(tmp10 + MULTIPLY(tmp14, FIX(0.178337691)) /* c2-c6 */ |
---|
1938 | + MULTIPLY(tmp16, FIX(0.400721155)), /* c10 */ |
---|
1939 | CONST_BITS+1); |
---|
1940 | dataptr[DCTSIZE*6] = (DCTELEM) |
---|
1941 | DESCALE(tmp10 - MULTIPLY(tmp15, FIX(1.122795725)) /* c6+c10 */ |
---|
1942 | - MULTIPLY(tmp16, FIX(0.900412262)), /* c2 */ |
---|
1943 | CONST_BITS+1); |
---|
1944 | |
---|
1945 | /* Odd part */ |
---|
1946 | |
---|
1947 | tmp10 = tmp1 + tmp2; |
---|
1948 | tmp11 = tmp5 - tmp4; |
---|
1949 | dataptr[DCTSIZE*7] = (DCTELEM) |
---|
1950 | DESCALE(MULTIPLY(tmp0 - tmp10 + tmp3 - tmp11 - tmp6, |
---|
1951 | FIX(0.653061224)), /* 32/49 */ |
---|
1952 | CONST_BITS+1); |
---|
1953 | tmp3 = MULTIPLY(tmp3 , FIX(0.653061224)); /* 32/49 */ |
---|
1954 | tmp10 = MULTIPLY(tmp10, - FIX(0.103406812)); /* -c13 */ |
---|
1955 | tmp11 = MULTIPLY(tmp11, FIX(0.917760839)); /* c1 */ |
---|
1956 | tmp10 += tmp11 - tmp3; |
---|
1957 | tmp11 = MULTIPLY(tmp0 + tmp2, FIX(0.782007410)) + /* c5 */ |
---|
1958 | MULTIPLY(tmp4 + tmp6, FIX(0.491367823)); /* c9 */ |
---|
1959 | dataptr[DCTSIZE*5] = (DCTELEM) |
---|
1960 | DESCALE(tmp10 + tmp11 - MULTIPLY(tmp2, FIX(1.550341076)) /* c3+c5-c13 */ |
---|
1961 | + MULTIPLY(tmp4, FIX(0.731428202)), /* c1+c11-c9 */ |
---|
1962 | CONST_BITS+1); |
---|
1963 | tmp12 = MULTIPLY(tmp0 + tmp1, FIX(0.871740478)) + /* c3 */ |
---|
1964 | MULTIPLY(tmp5 - tmp6, FIX(0.305035186)); /* c11 */ |
---|
1965 | dataptr[DCTSIZE*3] = (DCTELEM) |
---|
1966 | DESCALE(tmp10 + tmp12 - MULTIPLY(tmp1, FIX(0.276965844)) /* c3-c9-c13 */ |
---|
1967 | - MULTIPLY(tmp5, FIX(2.004803435)), /* c1+c5+c11 */ |
---|
1968 | CONST_BITS+1); |
---|
1969 | dataptr[DCTSIZE*1] = (DCTELEM) |
---|
1970 | DESCALE(tmp11 + tmp12 + tmp3 |
---|
1971 | - MULTIPLY(tmp0, FIX(0.735987049)) /* c3+c5-c1 */ |
---|
1972 | - MULTIPLY(tmp6, FIX(0.082925825)), /* c9-c11-c13 */ |
---|
1973 | CONST_BITS+1); |
---|
1974 | |
---|
1975 | dataptr++; /* advance pointer to next column */ |
---|
1976 | wsptr++; /* advance pointer to next column */ |
---|
1977 | } |
---|
1978 | } |
---|
1979 | |
---|
1980 | |
---|
1981 | /* |
---|
1982 | * Perform the forward DCT on a 15x15 sample block. |
---|
1983 | */ |
---|
1984 | |
---|
1985 | GLOBAL(void) |
---|
1986 | jpeg_fdct_15x15 (DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col) |
---|
1987 | { |
---|
1988 | INT32 tmp0, tmp1, tmp2, tmp3, tmp4, tmp5, tmp6, tmp7; |
---|
1989 | INT32 tmp10, tmp11, tmp12, tmp13, tmp14, tmp15, tmp16; |
---|
1990 | INT32 z1, z2, z3; |
---|
1991 | DCTELEM workspace[8*7]; |
---|
1992 | DCTELEM *dataptr; |
---|
1993 | DCTELEM *wsptr; |
---|
1994 | JSAMPROW elemptr; |
---|
1995 | int ctr; |
---|
1996 | SHIFT_TEMPS |
---|
1997 | |
---|
1998 | /* Pass 1: process rows. */ |
---|
1999 | /* Note results are scaled up by sqrt(8) compared to a true DCT. */ |
---|
2000 | /* cK represents sqrt(2) * cos(K*pi/30). */ |
---|
2001 | |
---|
2002 | dataptr = data; |
---|
2003 | ctr = 0; |
---|
2004 | for (;;) { |
---|
2005 | elemptr = sample_data[ctr] + start_col; |
---|
2006 | |
---|
2007 | /* Even part */ |
---|
2008 | |
---|
2009 | tmp0 = GETJSAMPLE(elemptr[0]) + GETJSAMPLE(elemptr[14]); |
---|
2010 | tmp1 = GETJSAMPLE(elemptr[1]) + GETJSAMPLE(elemptr[13]); |
---|
2011 | tmp2 = GETJSAMPLE(elemptr[2]) + GETJSAMPLE(elemptr[12]); |
---|
2012 | tmp3 = GETJSAMPLE(elemptr[3]) + GETJSAMPLE(elemptr[11]); |
---|
2013 | tmp4 = GETJSAMPLE(elemptr[4]) + GETJSAMPLE(elemptr[10]); |
---|
2014 | tmp5 = GETJSAMPLE(elemptr[5]) + GETJSAMPLE(elemptr[9]); |
---|
2015 | tmp6 = GETJSAMPLE(elemptr[6]) + GETJSAMPLE(elemptr[8]); |
---|
2016 | tmp7 = GETJSAMPLE(elemptr[7]); |
---|
2017 | |
---|
2018 | tmp10 = GETJSAMPLE(elemptr[0]) - GETJSAMPLE(elemptr[14]); |
---|
2019 | tmp11 = GETJSAMPLE(elemptr[1]) - GETJSAMPLE(elemptr[13]); |
---|
2020 | tmp12 = GETJSAMPLE(elemptr[2]) - GETJSAMPLE(elemptr[12]); |
---|
2021 | tmp13 = GETJSAMPLE(elemptr[3]) - GETJSAMPLE(elemptr[11]); |
---|
2022 | tmp14 = GETJSAMPLE(elemptr[4]) - GETJSAMPLE(elemptr[10]); |
---|
2023 | tmp15 = GETJSAMPLE(elemptr[5]) - GETJSAMPLE(elemptr[9]); |
---|
2024 | tmp16 = GETJSAMPLE(elemptr[6]) - GETJSAMPLE(elemptr[8]); |
---|
2025 | |
---|
2026 | z1 = tmp0 + tmp4 + tmp5; |
---|
2027 | z2 = tmp1 + tmp3 + tmp6; |
---|
2028 | z3 = tmp2 + tmp7; |
---|
2029 | /* Apply unsigned->signed conversion */ |
---|
2030 | dataptr[0] = (DCTELEM) (z1 + z2 + z3 - 15 * CENTERJSAMPLE); |
---|
2031 | z3 += z3; |
---|
2032 | dataptr[6] = (DCTELEM) |
---|
2033 | DESCALE(MULTIPLY(z1 - z3, FIX(1.144122806)) - /* c6 */ |
---|
2034 | MULTIPLY(z2 - z3, FIX(0.437016024)), /* c12 */ |
---|
2035 | CONST_BITS); |
---|
2036 | tmp2 += ((tmp1 + tmp4) >> 1) - tmp7 - tmp7; |
---|
2037 | z1 = MULTIPLY(tmp3 - tmp2, FIX(1.531135173)) - /* c2+c14 */ |
---|
2038 | MULTIPLY(tmp6 - tmp2, FIX(2.238241955)); /* c4+c8 */ |
---|
2039 | z2 = MULTIPLY(tmp5 - tmp2, FIX(0.798468008)) - /* c8-c14 */ |
---|
2040 | MULTIPLY(tmp0 - tmp2, FIX(0.091361227)); /* c2-c4 */ |
---|
2041 | z3 = MULTIPLY(tmp0 - tmp3, FIX(1.383309603)) + /* c2 */ |
---|
2042 | MULTIPLY(tmp6 - tmp5, FIX(0.946293579)) + /* c8 */ |
---|
2043 | MULTIPLY(tmp1 - tmp4, FIX(0.790569415)); /* (c6+c12)/2 */ |
---|
2044 | |
---|
2045 | dataptr[2] = (DCTELEM) DESCALE(z1 + z3, CONST_BITS); |
---|
2046 | dataptr[4] = (DCTELEM) DESCALE(z2 + z3, CONST_BITS); |
---|
2047 | |
---|
2048 | /* Odd part */ |
---|
2049 | |
---|
2050 | tmp2 = MULTIPLY(tmp10 - tmp12 - tmp13 + tmp15 + tmp16, |
---|
2051 | FIX(1.224744871)); /* c5 */ |
---|
2052 | tmp1 = MULTIPLY(tmp10 - tmp14 - tmp15, FIX(1.344997024)) + /* c3 */ |
---|
2053 | MULTIPLY(tmp11 - tmp13 - tmp16, FIX(0.831253876)); /* c9 */ |
---|
2054 | tmp12 = MULTIPLY(tmp12, FIX(1.224744871)); /* c5 */ |
---|
2055 | tmp4 = MULTIPLY(tmp10 - tmp16, FIX(1.406466353)) + /* c1 */ |
---|
2056 | MULTIPLY(tmp11 + tmp14, FIX(1.344997024)) + /* c3 */ |
---|
2057 | MULTIPLY(tmp13 + tmp15, FIX(0.575212477)); /* c11 */ |
---|
2058 | tmp0 = MULTIPLY(tmp13, FIX(0.475753014)) - /* c7-c11 */ |
---|
2059 | MULTIPLY(tmp14, FIX(0.513743148)) + /* c3-c9 */ |
---|
2060 | MULTIPLY(tmp16, FIX(1.700497885)) + tmp4 + tmp12; /* c1+c13 */ |
---|
2061 | tmp3 = MULTIPLY(tmp10, - FIX(0.355500862)) - /* -(c1-c7) */ |
---|
2062 | MULTIPLY(tmp11, FIX(2.176250899)) - /* c3+c9 */ |
---|
2063 | MULTIPLY(tmp15, FIX(0.869244010)) + tmp4 - tmp12; /* c11+c13 */ |
---|
2064 | |
---|
2065 | dataptr[1] = (DCTELEM) DESCALE(tmp0, CONST_BITS); |
---|
2066 | dataptr[3] = (DCTELEM) DESCALE(tmp1, CONST_BITS); |
---|
2067 | dataptr[5] = (DCTELEM) DESCALE(tmp2, CONST_BITS); |
---|
2068 | dataptr[7] = (DCTELEM) DESCALE(tmp3, CONST_BITS); |
---|
2069 | |
---|
2070 | ctr++; |
---|
2071 | |
---|
2072 | if (ctr != DCTSIZE) { |
---|
2073 | if (ctr == 15) |
---|
2074 | break; /* Done. */ |
---|
2075 | dataptr += DCTSIZE; /* advance pointer to next row */ |
---|
2076 | } else |
---|
2077 | dataptr = workspace; /* switch pointer to extended workspace */ |
---|
2078 | } |
---|
2079 | |
---|
2080 | /* Pass 2: process columns. |
---|
2081 | * We leave the results scaled up by an overall factor of 8. |
---|
2082 | * We must also scale the output by (8/15)**2 = 64/225, which we partially |
---|
2083 | * fold into the constant multipliers and final shifting: |
---|
2084 | * cK now represents sqrt(2) * cos(K*pi/30) * 256/225. |
---|
2085 | */ |
---|
2086 | |
---|
2087 | dataptr = data; |
---|
2088 | wsptr = workspace; |
---|
2089 | for (ctr = DCTSIZE-1; ctr >= 0; ctr--) { |
---|
2090 | /* Even part */ |
---|
2091 | |
---|
2092 | tmp0 = dataptr[DCTSIZE*0] + wsptr[DCTSIZE*6]; |
---|
2093 | tmp1 = dataptr[DCTSIZE*1] + wsptr[DCTSIZE*5]; |
---|
2094 | tmp2 = dataptr[DCTSIZE*2] + wsptr[DCTSIZE*4]; |
---|
2095 | tmp3 = dataptr[DCTSIZE*3] + wsptr[DCTSIZE*3]; |
---|
2096 | tmp4 = dataptr[DCTSIZE*4] + wsptr[DCTSIZE*2]; |
---|
2097 | tmp5 = dataptr[DCTSIZE*5] + wsptr[DCTSIZE*1]; |
---|
2098 | tmp6 = dataptr[DCTSIZE*6] + wsptr[DCTSIZE*0]; |
---|
2099 | tmp7 = dataptr[DCTSIZE*7]; |
---|
2100 | |
---|
2101 | tmp10 = dataptr[DCTSIZE*0] - wsptr[DCTSIZE*6]; |
---|
2102 | tmp11 = dataptr[DCTSIZE*1] - wsptr[DCTSIZE*5]; |
---|
2103 | tmp12 = dataptr[DCTSIZE*2] - wsptr[DCTSIZE*4]; |
---|
2104 | tmp13 = dataptr[DCTSIZE*3] - wsptr[DCTSIZE*3]; |
---|
2105 | tmp14 = dataptr[DCTSIZE*4] - wsptr[DCTSIZE*2]; |
---|
2106 | tmp15 = dataptr[DCTSIZE*5] - wsptr[DCTSIZE*1]; |
---|
2107 | tmp16 = dataptr[DCTSIZE*6] - wsptr[DCTSIZE*0]; |
---|
2108 | |
---|
2109 | z1 = tmp0 + tmp4 + tmp5; |
---|
2110 | z2 = tmp1 + tmp3 + tmp6; |
---|
2111 | z3 = tmp2 + tmp7; |
---|
2112 | dataptr[DCTSIZE*0] = (DCTELEM) |
---|
2113 | DESCALE(MULTIPLY(z1 + z2 + z3, FIX(1.137777778)), /* 256/225 */ |
---|
2114 | CONST_BITS+2); |
---|
2115 | z3 += z3; |
---|
2116 | dataptr[DCTSIZE*6] = (DCTELEM) |
---|
2117 | DESCALE(MULTIPLY(z1 - z3, FIX(1.301757503)) - /* c6 */ |
---|
2118 | MULTIPLY(z2 - z3, FIX(0.497227121)), /* c12 */ |
---|
2119 | CONST_BITS+2); |
---|
2120 | tmp2 += ((tmp1 + tmp4) >> 1) - tmp7 - tmp7; |
---|
2121 | z1 = MULTIPLY(tmp3 - tmp2, FIX(1.742091575)) - /* c2+c14 */ |
---|
2122 | MULTIPLY(tmp6 - tmp2, FIX(2.546621957)); /* c4+c8 */ |
---|
2123 | z2 = MULTIPLY(tmp5 - tmp2, FIX(0.908479156)) - /* c8-c14 */ |
---|
2124 | MULTIPLY(tmp0 - tmp2, FIX(0.103948774)); /* c2-c4 */ |
---|
2125 | z3 = MULTIPLY(tmp0 - tmp3, FIX(1.573898926)) + /* c2 */ |
---|
2126 | MULTIPLY(tmp6 - tmp5, FIX(1.076671805)) + /* c8 */ |
---|
2127 | MULTIPLY(tmp1 - tmp4, FIX(0.899492312)); /* (c6+c12)/2 */ |
---|
2128 | |
---|
2129 | dataptr[DCTSIZE*2] = (DCTELEM) DESCALE(z1 + z3, CONST_BITS+2); |
---|
2130 | dataptr[DCTSIZE*4] = (DCTELEM) DESCALE(z2 + z3, CONST_BITS+2); |
---|
2131 | |
---|
2132 | /* Odd part */ |
---|
2133 | |
---|
2134 | tmp2 = MULTIPLY(tmp10 - tmp12 - tmp13 + tmp15 + tmp16, |
---|
2135 | FIX(1.393487498)); /* c5 */ |
---|
2136 | tmp1 = MULTIPLY(tmp10 - tmp14 - tmp15, FIX(1.530307725)) + /* c3 */ |
---|
2137 | MULTIPLY(tmp11 - tmp13 - tmp16, FIX(0.945782187)); /* c9 */ |
---|
2138 | tmp12 = MULTIPLY(tmp12, FIX(1.393487498)); /* c5 */ |
---|
2139 | tmp4 = MULTIPLY(tmp10 - tmp16, FIX(1.600246161)) + /* c1 */ |
---|
2140 | MULTIPLY(tmp11 + tmp14, FIX(1.530307725)) + /* c3 */ |
---|
2141 | MULTIPLY(tmp13 + tmp15, FIX(0.654463974)); /* c11 */ |
---|
2142 | tmp0 = MULTIPLY(tmp13, FIX(0.541301207)) - /* c7-c11 */ |
---|
2143 | MULTIPLY(tmp14, FIX(0.584525538)) + /* c3-c9 */ |
---|
2144 | MULTIPLY(tmp16, FIX(1.934788705)) + tmp4 + tmp12; /* c1+c13 */ |
---|
2145 | tmp3 = MULTIPLY(tmp10, - FIX(0.404480980)) - /* -(c1-c7) */ |
---|
2146 | MULTIPLY(tmp11, FIX(2.476089912)) - /* c3+c9 */ |
---|
2147 | MULTIPLY(tmp15, FIX(0.989006518)) + tmp4 - tmp12; /* c11+c13 */ |
---|
2148 | |
---|
2149 | dataptr[DCTSIZE*1] = (DCTELEM) DESCALE(tmp0, CONST_BITS+2); |
---|
2150 | dataptr[DCTSIZE*3] = (DCTELEM) DESCALE(tmp1, CONST_BITS+2); |
---|
2151 | dataptr[DCTSIZE*5] = (DCTELEM) DESCALE(tmp2, CONST_BITS+2); |
---|
2152 | dataptr[DCTSIZE*7] = (DCTELEM) DESCALE(tmp3, CONST_BITS+2); |
---|
2153 | |
---|
2154 | dataptr++; /* advance pointer to next column */ |
---|
2155 | wsptr++; /* advance pointer to next column */ |
---|
2156 | } |
---|
2157 | } |
---|
2158 | |
---|
2159 | |
---|
2160 | /* |
---|
2161 | * Perform the forward DCT on a 16x16 sample block. |
---|
2162 | */ |
---|
2163 | |
---|
2164 | GLOBAL(void) |
---|
2165 | jpeg_fdct_16x16 (DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col) |
---|
2166 | { |
---|
2167 | INT32 tmp0, tmp1, tmp2, tmp3, tmp4, tmp5, tmp6, tmp7; |
---|
2168 | INT32 tmp10, tmp11, tmp12, tmp13, tmp14, tmp15, tmp16, tmp17; |
---|
2169 | DCTELEM workspace[DCTSIZE2]; |
---|
2170 | DCTELEM *dataptr; |
---|
2171 | DCTELEM *wsptr; |
---|
2172 | JSAMPROW elemptr; |
---|
2173 | int ctr; |
---|
2174 | SHIFT_TEMPS |
---|
2175 | |
---|
2176 | /* Pass 1: process rows. */ |
---|
2177 | /* Note results are scaled up by sqrt(8) compared to a true DCT; */ |
---|
2178 | /* furthermore, we scale the results by 2**PASS1_BITS. */ |
---|
2179 | /* cK represents sqrt(2) * cos(K*pi/32). */ |
---|
2180 | |
---|
2181 | dataptr = data; |
---|
2182 | ctr = 0; |
---|
2183 | for (;;) { |
---|
2184 | elemptr = sample_data[ctr] + start_col; |
---|
2185 | |
---|
2186 | /* Even part */ |
---|
2187 | |
---|
2188 | tmp0 = GETJSAMPLE(elemptr[0]) + GETJSAMPLE(elemptr[15]); |
---|
2189 | tmp1 = GETJSAMPLE(elemptr[1]) + GETJSAMPLE(elemptr[14]); |
---|
2190 | tmp2 = GETJSAMPLE(elemptr[2]) + GETJSAMPLE(elemptr[13]); |
---|
2191 | tmp3 = GETJSAMPLE(elemptr[3]) + GETJSAMPLE(elemptr[12]); |
---|
2192 | tmp4 = GETJSAMPLE(elemptr[4]) + GETJSAMPLE(elemptr[11]); |
---|
2193 | tmp5 = GETJSAMPLE(elemptr[5]) + GETJSAMPLE(elemptr[10]); |
---|
2194 | tmp6 = GETJSAMPLE(elemptr[6]) + GETJSAMPLE(elemptr[9]); |
---|
2195 | tmp7 = GETJSAMPLE(elemptr[7]) + GETJSAMPLE(elemptr[8]); |
---|
2196 | |
---|
2197 | tmp10 = tmp0 + tmp7; |
---|
2198 | tmp14 = tmp0 - tmp7; |
---|
2199 | tmp11 = tmp1 + tmp6; |
---|
2200 | tmp15 = tmp1 - tmp6; |
---|
2201 | tmp12 = tmp2 + tmp5; |
---|
2202 | tmp16 = tmp2 - tmp5; |
---|
2203 | tmp13 = tmp3 + tmp4; |
---|
2204 | tmp17 = tmp3 - tmp4; |
---|
2205 | |
---|
2206 | tmp0 = GETJSAMPLE(elemptr[0]) - GETJSAMPLE(elemptr[15]); |
---|
2207 | tmp1 = GETJSAMPLE(elemptr[1]) - GETJSAMPLE(elemptr[14]); |
---|
2208 | tmp2 = GETJSAMPLE(elemptr[2]) - GETJSAMPLE(elemptr[13]); |
---|
2209 | tmp3 = GETJSAMPLE(elemptr[3]) - GETJSAMPLE(elemptr[12]); |
---|
2210 | tmp4 = GETJSAMPLE(elemptr[4]) - GETJSAMPLE(elemptr[11]); |
---|
2211 | tmp5 = GETJSAMPLE(elemptr[5]) - GETJSAMPLE(elemptr[10]); |
---|
2212 | tmp6 = GETJSAMPLE(elemptr[6]) - GETJSAMPLE(elemptr[9]); |
---|
2213 | tmp7 = GETJSAMPLE(elemptr[7]) - GETJSAMPLE(elemptr[8]); |
---|
2214 | |
---|
2215 | /* Apply unsigned->signed conversion */ |
---|
2216 | dataptr[0] = (DCTELEM) |
---|
2217 | ((tmp10 + tmp11 + tmp12 + tmp13 - 16 * CENTERJSAMPLE) << PASS1_BITS); |
---|
2218 | dataptr[4] = (DCTELEM) |
---|
2219 | DESCALE(MULTIPLY(tmp10 - tmp13, FIX(1.306562965)) + /* c4[16] = c2[8] */ |
---|
2220 | MULTIPLY(tmp11 - tmp12, FIX_0_541196100), /* c12[16] = c6[8] */ |
---|
2221 | CONST_BITS-PASS1_BITS); |
---|
2222 | |
---|
2223 | tmp10 = MULTIPLY(tmp17 - tmp15, FIX(0.275899379)) + /* c14[16] = c7[8] */ |
---|
2224 | MULTIPLY(tmp14 - tmp16, FIX(1.387039845)); /* c2[16] = c1[8] */ |
---|
2225 | |
---|
2226 | dataptr[2] = (DCTELEM) |
---|
2227 | DESCALE(tmp10 + MULTIPLY(tmp15, FIX(1.451774982)) /* c6+c14 */ |
---|
2228 | + MULTIPLY(tmp16, FIX(2.172734804)), /* c2+c10 */ |
---|
2229 | CONST_BITS-PASS1_BITS); |
---|
2230 | dataptr[6] = (DCTELEM) |
---|
2231 | DESCALE(tmp10 - MULTIPLY(tmp14, FIX(0.211164243)) /* c2-c6 */ |
---|
2232 | - MULTIPLY(tmp17, FIX(1.061594338)), /* c10+c14 */ |
---|
2233 | CONST_BITS-PASS1_BITS); |
---|
2234 | |
---|
2235 | /* Odd part */ |
---|
2236 | |
---|
2237 | tmp11 = MULTIPLY(tmp0 + tmp1, FIX(1.353318001)) + /* c3 */ |
---|
2238 | MULTIPLY(tmp6 - tmp7, FIX(0.410524528)); /* c13 */ |
---|
2239 | tmp12 = MULTIPLY(tmp0 + tmp2, FIX(1.247225013)) + /* c5 */ |
---|
2240 | MULTIPLY(tmp5 + tmp7, FIX(0.666655658)); /* c11 */ |
---|
2241 | tmp13 = MULTIPLY(tmp0 + tmp3, FIX(1.093201867)) + /* c7 */ |
---|
2242 | MULTIPLY(tmp4 - tmp7, FIX(0.897167586)); /* c9 */ |
---|
2243 | tmp14 = MULTIPLY(tmp1 + tmp2, FIX(0.138617169)) + /* c15 */ |
---|
2244 | MULTIPLY(tmp6 - tmp5, FIX(1.407403738)); /* c1 */ |
---|
2245 | tmp15 = MULTIPLY(tmp1 + tmp3, - FIX(0.666655658)) + /* -c11 */ |
---|
2246 | MULTIPLY(tmp4 + tmp6, - FIX(1.247225013)); /* -c5 */ |
---|
2247 | tmp16 = MULTIPLY(tmp2 + tmp3, - FIX(1.353318001)) + /* -c3 */ |
---|
2248 | MULTIPLY(tmp5 - tmp4, FIX(0.410524528)); /* c13 */ |
---|
2249 | tmp10 = tmp11 + tmp12 + tmp13 - |
---|
2250 | MULTIPLY(tmp0, FIX(2.286341144)) + /* c7+c5+c3-c1 */ |
---|
2251 | MULTIPLY(tmp7, FIX(0.779653625)); /* c15+c13-c11+c9 */ |
---|
2252 | tmp11 += tmp14 + tmp15 + MULTIPLY(tmp1, FIX(0.071888074)) /* c9-c3-c15+c11 */ |
---|
2253 | - MULTIPLY(tmp6, FIX(1.663905119)); /* c7+c13+c1-c5 */ |
---|
2254 | tmp12 += tmp14 + tmp16 - MULTIPLY(tmp2, FIX(1.125726048)) /* c7+c5+c15-c3 */ |
---|
2255 | + MULTIPLY(tmp5, FIX(1.227391138)); /* c9-c11+c1-c13 */ |
---|
2256 | tmp13 += tmp15 + tmp16 + MULTIPLY(tmp3, FIX(1.065388962)) /* c15+c3+c11-c7 */ |
---|
2257 | + MULTIPLY(tmp4, FIX(2.167985692)); /* c1+c13+c5-c9 */ |
---|
2258 | |
---|
2259 | dataptr[1] = (DCTELEM) DESCALE(tmp10, CONST_BITS-PASS1_BITS); |
---|
2260 | dataptr[3] = (DCTELEM) DESCALE(tmp11, CONST_BITS-PASS1_BITS); |
---|
2261 | dataptr[5] = (DCTELEM) DESCALE(tmp12, CONST_BITS-PASS1_BITS); |
---|
2262 | dataptr[7] = (DCTELEM) DESCALE(tmp13, CONST_BITS-PASS1_BITS); |
---|
2263 | |
---|
2264 | ctr++; |
---|
2265 | |
---|
2266 | if (ctr != DCTSIZE) { |
---|
2267 | if (ctr == DCTSIZE * 2) |
---|
2268 | break; /* Done. */ |
---|
2269 | dataptr += DCTSIZE; /* advance pointer to next row */ |
---|
2270 | } else |
---|
2271 | dataptr = workspace; /* switch pointer to extended workspace */ |
---|
2272 | } |
---|
2273 | |
---|
2274 | /* Pass 2: process columns. |
---|
2275 | * We remove the PASS1_BITS scaling, but leave the results scaled up |
---|
2276 | * by an overall factor of 8. |
---|
2277 | * We must also scale the output by (8/16)**2 = 1/2**2. |
---|
2278 | */ |
---|
2279 | |
---|
2280 | dataptr = data; |
---|
2281 | wsptr = workspace; |
---|
2282 | for (ctr = DCTSIZE-1; ctr >= 0; ctr--) { |
---|
2283 | /* Even part */ |
---|
2284 | |
---|
2285 | tmp0 = dataptr[DCTSIZE*0] + wsptr[DCTSIZE*7]; |
---|
2286 | tmp1 = dataptr[DCTSIZE*1] + wsptr[DCTSIZE*6]; |
---|
2287 | tmp2 = dataptr[DCTSIZE*2] + wsptr[DCTSIZE*5]; |
---|
2288 | tmp3 = dataptr[DCTSIZE*3] + wsptr[DCTSIZE*4]; |
---|
2289 | tmp4 = dataptr[DCTSIZE*4] + wsptr[DCTSIZE*3]; |
---|
2290 | tmp5 = dataptr[DCTSIZE*5] + wsptr[DCTSIZE*2]; |
---|
2291 | tmp6 = dataptr[DCTSIZE*6] + wsptr[DCTSIZE*1]; |
---|
2292 | tmp7 = dataptr[DCTSIZE*7] + wsptr[DCTSIZE*0]; |
---|
2293 | |
---|
2294 | tmp10 = tmp0 + tmp7; |
---|
2295 | tmp14 = tmp0 - tmp7; |
---|
2296 | tmp11 = tmp1 + tmp6; |
---|
2297 | tmp15 = tmp1 - tmp6; |
---|
2298 | tmp12 = tmp2 + tmp5; |
---|
2299 | tmp16 = tmp2 - tmp5; |
---|
2300 | tmp13 = tmp3 + tmp4; |
---|
2301 | tmp17 = tmp3 - tmp4; |
---|
2302 | |
---|
2303 | tmp0 = dataptr[DCTSIZE*0] - wsptr[DCTSIZE*7]; |
---|
2304 | tmp1 = dataptr[DCTSIZE*1] - wsptr[DCTSIZE*6]; |
---|
2305 | tmp2 = dataptr[DCTSIZE*2] - wsptr[DCTSIZE*5]; |
---|
2306 | tmp3 = dataptr[DCTSIZE*3] - wsptr[DCTSIZE*4]; |
---|
2307 | tmp4 = dataptr[DCTSIZE*4] - wsptr[DCTSIZE*3]; |
---|
2308 | tmp5 = dataptr[DCTSIZE*5] - wsptr[DCTSIZE*2]; |
---|
2309 | tmp6 = dataptr[DCTSIZE*6] - wsptr[DCTSIZE*1]; |
---|
2310 | tmp7 = dataptr[DCTSIZE*7] - wsptr[DCTSIZE*0]; |
---|
2311 | |
---|
2312 | dataptr[DCTSIZE*0] = (DCTELEM) |
---|
2313 | DESCALE(tmp10 + tmp11 + tmp12 + tmp13, PASS1_BITS+2); |
---|
2314 | dataptr[DCTSIZE*4] = (DCTELEM) |
---|
2315 | DESCALE(MULTIPLY(tmp10 - tmp13, FIX(1.306562965)) + /* c4[16] = c2[8] */ |
---|
2316 | MULTIPLY(tmp11 - tmp12, FIX_0_541196100), /* c12[16] = c6[8] */ |
---|
2317 | CONST_BITS+PASS1_BITS+2); |
---|
2318 | |
---|
2319 | tmp10 = MULTIPLY(tmp17 - tmp15, FIX(0.275899379)) + /* c14[16] = c7[8] */ |
---|
2320 | MULTIPLY(tmp14 - tmp16, FIX(1.387039845)); /* c2[16] = c1[8] */ |
---|
2321 | |
---|
2322 | dataptr[DCTSIZE*2] = (DCTELEM) |
---|
2323 | DESCALE(tmp10 + MULTIPLY(tmp15, FIX(1.451774982)) /* c6+c14 */ |
---|
2324 | + MULTIPLY(tmp16, FIX(2.172734804)), /* c2+10 */ |
---|
2325 | CONST_BITS+PASS1_BITS+2); |
---|
2326 | dataptr[DCTSIZE*6] = (DCTELEM) |
---|
2327 | DESCALE(tmp10 - MULTIPLY(tmp14, FIX(0.211164243)) /* c2-c6 */ |
---|
2328 | - MULTIPLY(tmp17, FIX(1.061594338)), /* c10+c14 */ |
---|
2329 | CONST_BITS+PASS1_BITS+2); |
---|
2330 | |
---|
2331 | /* Odd part */ |
---|
2332 | |
---|
2333 | tmp11 = MULTIPLY(tmp0 + tmp1, FIX(1.353318001)) + /* c3 */ |
---|
2334 | MULTIPLY(tmp6 - tmp7, FIX(0.410524528)); /* c13 */ |
---|
2335 | tmp12 = MULTIPLY(tmp0 + tmp2, FIX(1.247225013)) + /* c5 */ |
---|
2336 | MULTIPLY(tmp5 + tmp7, FIX(0.666655658)); /* c11 */ |
---|
2337 | tmp13 = MULTIPLY(tmp0 + tmp3, FIX(1.093201867)) + /* c7 */ |
---|
2338 | MULTIPLY(tmp4 - tmp7, FIX(0.897167586)); /* c9 */ |
---|
2339 | tmp14 = MULTIPLY(tmp1 + tmp2, FIX(0.138617169)) + /* c15 */ |
---|
2340 | MULTIPLY(tmp6 - tmp5, FIX(1.407403738)); /* c1 */ |
---|
2341 | tmp15 = MULTIPLY(tmp1 + tmp3, - FIX(0.666655658)) + /* -c11 */ |
---|
2342 | MULTIPLY(tmp4 + tmp6, - FIX(1.247225013)); /* -c5 */ |
---|
2343 | tmp16 = MULTIPLY(tmp2 + tmp3, - FIX(1.353318001)) + /* -c3 */ |
---|
2344 | MULTIPLY(tmp5 - tmp4, FIX(0.410524528)); /* c13 */ |
---|
2345 | tmp10 = tmp11 + tmp12 + tmp13 - |
---|
2346 | MULTIPLY(tmp0, FIX(2.286341144)) + /* c7+c5+c3-c1 */ |
---|
2347 | MULTIPLY(tmp7, FIX(0.779653625)); /* c15+c13-c11+c9 */ |
---|
2348 | tmp11 += tmp14 + tmp15 + MULTIPLY(tmp1, FIX(0.071888074)) /* c9-c3-c15+c11 */ |
---|
2349 | - MULTIPLY(tmp6, FIX(1.663905119)); /* c7+c13+c1-c5 */ |
---|
2350 | tmp12 += tmp14 + tmp16 - MULTIPLY(tmp2, FIX(1.125726048)) /* c7+c5+c15-c3 */ |
---|
2351 | + MULTIPLY(tmp5, FIX(1.227391138)); /* c9-c11+c1-c13 */ |
---|
2352 | tmp13 += tmp15 + tmp16 + MULTIPLY(tmp3, FIX(1.065388962)) /* c15+c3+c11-c7 */ |
---|
2353 | + MULTIPLY(tmp4, FIX(2.167985692)); /* c1+c13+c5-c9 */ |
---|
2354 | |
---|
2355 | dataptr[DCTSIZE*1] = (DCTELEM) DESCALE(tmp10, CONST_BITS+PASS1_BITS+2); |
---|
2356 | dataptr[DCTSIZE*3] = (DCTELEM) DESCALE(tmp11, CONST_BITS+PASS1_BITS+2); |
---|
2357 | dataptr[DCTSIZE*5] = (DCTELEM) DESCALE(tmp12, CONST_BITS+PASS1_BITS+2); |
---|
2358 | dataptr[DCTSIZE*7] = (DCTELEM) DESCALE(tmp13, CONST_BITS+PASS1_BITS+2); |
---|
2359 | |
---|
2360 | dataptr++; /* advance pointer to next column */ |
---|
2361 | wsptr++; /* advance pointer to next column */ |
---|
2362 | } |
---|
2363 | } |
---|
2364 | |
---|
2365 | |
---|
2366 | /* |
---|
2367 | * Perform the forward DCT on a 16x8 sample block. |
---|
2368 | * |
---|
2369 | * 16-point FDCT in pass 1 (rows), 8-point in pass 2 (columns). |
---|
2370 | */ |
---|
2371 | |
---|
2372 | GLOBAL(void) |
---|
2373 | jpeg_fdct_16x8 (DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col) |
---|
2374 | { |
---|
2375 | INT32 tmp0, tmp1, tmp2, tmp3, tmp4, tmp5, tmp6, tmp7; |
---|
2376 | INT32 tmp10, tmp11, tmp12, tmp13, tmp14, tmp15, tmp16, tmp17; |
---|
2377 | INT32 z1; |
---|
2378 | DCTELEM *dataptr; |
---|
2379 | JSAMPROW elemptr; |
---|
2380 | int ctr; |
---|
2381 | SHIFT_TEMPS |
---|
2382 | |
---|
2383 | /* Pass 1: process rows. */ |
---|
2384 | /* Note results are scaled up by sqrt(8) compared to a true DCT; */ |
---|
2385 | /* furthermore, we scale the results by 2**PASS1_BITS. */ |
---|
2386 | /* 16-point FDCT kernel, cK represents sqrt(2) * cos(K*pi/32). */ |
---|
2387 | |
---|
2388 | dataptr = data; |
---|
2389 | ctr = 0; |
---|
2390 | for (ctr = 0; ctr < DCTSIZE; ctr++) { |
---|
2391 | elemptr = sample_data[ctr] + start_col; |
---|
2392 | |
---|
2393 | /* Even part */ |
---|
2394 | |
---|
2395 | tmp0 = GETJSAMPLE(elemptr[0]) + GETJSAMPLE(elemptr[15]); |
---|
2396 | tmp1 = GETJSAMPLE(elemptr[1]) + GETJSAMPLE(elemptr[14]); |
---|
2397 | tmp2 = GETJSAMPLE(elemptr[2]) + GETJSAMPLE(elemptr[13]); |
---|
2398 | tmp3 = GETJSAMPLE(elemptr[3]) + GETJSAMPLE(elemptr[12]); |
---|
2399 | tmp4 = GETJSAMPLE(elemptr[4]) + GETJSAMPLE(elemptr[11]); |
---|
2400 | tmp5 = GETJSAMPLE(elemptr[5]) + GETJSAMPLE(elemptr[10]); |
---|
2401 | tmp6 = GETJSAMPLE(elemptr[6]) + GETJSAMPLE(elemptr[9]); |
---|
2402 | tmp7 = GETJSAMPLE(elemptr[7]) + GETJSAMPLE(elemptr[8]); |
---|
2403 | |
---|
2404 | tmp10 = tmp0 + tmp7; |
---|
2405 | tmp14 = tmp0 - tmp7; |
---|
2406 | tmp11 = tmp1 + tmp6; |
---|
2407 | tmp15 = tmp1 - tmp6; |
---|
2408 | tmp12 = tmp2 + tmp5; |
---|
2409 | tmp16 = tmp2 - tmp5; |
---|
2410 | tmp13 = tmp3 + tmp4; |
---|
2411 | tmp17 = tmp3 - tmp4; |
---|
2412 | |
---|
2413 | tmp0 = GETJSAMPLE(elemptr[0]) - GETJSAMPLE(elemptr[15]); |
---|
2414 | tmp1 = GETJSAMPLE(elemptr[1]) - GETJSAMPLE(elemptr[14]); |
---|
2415 | tmp2 = GETJSAMPLE(elemptr[2]) - GETJSAMPLE(elemptr[13]); |
---|
2416 | tmp3 = GETJSAMPLE(elemptr[3]) - GETJSAMPLE(elemptr[12]); |
---|
2417 | tmp4 = GETJSAMPLE(elemptr[4]) - GETJSAMPLE(elemptr[11]); |
---|
2418 | tmp5 = GETJSAMPLE(elemptr[5]) - GETJSAMPLE(elemptr[10]); |
---|
2419 | tmp6 = GETJSAMPLE(elemptr[6]) - GETJSAMPLE(elemptr[9]); |
---|
2420 | tmp7 = GETJSAMPLE(elemptr[7]) - GETJSAMPLE(elemptr[8]); |
---|
2421 | |
---|
2422 | /* Apply unsigned->signed conversion */ |
---|
2423 | dataptr[0] = (DCTELEM) |
---|
2424 | ((tmp10 + tmp11 + tmp12 + tmp13 - 16 * CENTERJSAMPLE) << PASS1_BITS); |
---|
2425 | dataptr[4] = (DCTELEM) |
---|
2426 | DESCALE(MULTIPLY(tmp10 - tmp13, FIX(1.306562965)) + /* c4[16] = c2[8] */ |
---|
2427 | MULTIPLY(tmp11 - tmp12, FIX_0_541196100), /* c12[16] = c6[8] */ |
---|
2428 | CONST_BITS-PASS1_BITS); |
---|
2429 | |
---|
2430 | tmp10 = MULTIPLY(tmp17 - tmp15, FIX(0.275899379)) + /* c14[16] = c7[8] */ |
---|
2431 | MULTIPLY(tmp14 - tmp16, FIX(1.387039845)); /* c2[16] = c1[8] */ |
---|
2432 | |
---|
2433 | dataptr[2] = (DCTELEM) |
---|
2434 | DESCALE(tmp10 + MULTIPLY(tmp15, FIX(1.451774982)) /* c6+c14 */ |
---|
2435 | + MULTIPLY(tmp16, FIX(2.172734804)), /* c2+c10 */ |
---|
2436 | CONST_BITS-PASS1_BITS); |
---|
2437 | dataptr[6] = (DCTELEM) |
---|
2438 | DESCALE(tmp10 - MULTIPLY(tmp14, FIX(0.211164243)) /* c2-c6 */ |
---|
2439 | - MULTIPLY(tmp17, FIX(1.061594338)), /* c10+c14 */ |
---|
2440 | CONST_BITS-PASS1_BITS); |
---|
2441 | |
---|
2442 | /* Odd part */ |
---|
2443 | |
---|
2444 | tmp11 = MULTIPLY(tmp0 + tmp1, FIX(1.353318001)) + /* c3 */ |
---|
2445 | MULTIPLY(tmp6 - tmp7, FIX(0.410524528)); /* c13 */ |
---|
2446 | tmp12 = MULTIPLY(tmp0 + tmp2, FIX(1.247225013)) + /* c5 */ |
---|
2447 | MULTIPLY(tmp5 + tmp7, FIX(0.666655658)); /* c11 */ |
---|
2448 | tmp13 = MULTIPLY(tmp0 + tmp3, FIX(1.093201867)) + /* c7 */ |
---|
2449 | MULTIPLY(tmp4 - tmp7, FIX(0.897167586)); /* c9 */ |
---|
2450 | tmp14 = MULTIPLY(tmp1 + tmp2, FIX(0.138617169)) + /* c15 */ |
---|
2451 | MULTIPLY(tmp6 - tmp5, FIX(1.407403738)); /* c1 */ |
---|
2452 | tmp15 = MULTIPLY(tmp1 + tmp3, - FIX(0.666655658)) + /* -c11 */ |
---|
2453 | MULTIPLY(tmp4 + tmp6, - FIX(1.247225013)); /* -c5 */ |
---|
2454 | tmp16 = MULTIPLY(tmp2 + tmp3, - FIX(1.353318001)) + /* -c3 */ |
---|
2455 | MULTIPLY(tmp5 - tmp4, FIX(0.410524528)); /* c13 */ |
---|
2456 | tmp10 = tmp11 + tmp12 + tmp13 - |
---|
2457 | MULTIPLY(tmp0, FIX(2.286341144)) + /* c7+c5+c3-c1 */ |
---|
2458 | MULTIPLY(tmp7, FIX(0.779653625)); /* c15+c13-c11+c9 */ |
---|
2459 | tmp11 += tmp14 + tmp15 + MULTIPLY(tmp1, FIX(0.071888074)) /* c9-c3-c15+c11 */ |
---|
2460 | - MULTIPLY(tmp6, FIX(1.663905119)); /* c7+c13+c1-c5 */ |
---|
2461 | tmp12 += tmp14 + tmp16 - MULTIPLY(tmp2, FIX(1.125726048)) /* c7+c5+c15-c3 */ |
---|
2462 | + MULTIPLY(tmp5, FIX(1.227391138)); /* c9-c11+c1-c13 */ |
---|
2463 | tmp13 += tmp15 + tmp16 + MULTIPLY(tmp3, FIX(1.065388962)) /* c15+c3+c11-c7 */ |
---|
2464 | + MULTIPLY(tmp4, FIX(2.167985692)); /* c1+c13+c5-c9 */ |
---|
2465 | |
---|
2466 | dataptr[1] = (DCTELEM) DESCALE(tmp10, CONST_BITS-PASS1_BITS); |
---|
2467 | dataptr[3] = (DCTELEM) DESCALE(tmp11, CONST_BITS-PASS1_BITS); |
---|
2468 | dataptr[5] = (DCTELEM) DESCALE(tmp12, CONST_BITS-PASS1_BITS); |
---|
2469 | dataptr[7] = (DCTELEM) DESCALE(tmp13, CONST_BITS-PASS1_BITS); |
---|
2470 | |
---|
2471 | dataptr += DCTSIZE; /* advance pointer to next row */ |
---|
2472 | } |
---|
2473 | |
---|
2474 | /* Pass 2: process columns. |
---|
2475 | * We remove the PASS1_BITS scaling, but leave the results scaled up |
---|
2476 | * by an overall factor of 8. |
---|
2477 | * We must also scale the output by 8/16 = 1/2. |
---|
2478 | */ |
---|
2479 | |
---|
2480 | dataptr = data; |
---|
2481 | for (ctr = DCTSIZE-1; ctr >= 0; ctr--) { |
---|
2482 | /* Even part per LL&M figure 1 --- note that published figure is faulty; |
---|
2483 | * rotator "sqrt(2)*c1" should be "sqrt(2)*c6". |
---|
2484 | */ |
---|
2485 | |
---|
2486 | tmp0 = dataptr[DCTSIZE*0] + dataptr[DCTSIZE*7]; |
---|
2487 | tmp1 = dataptr[DCTSIZE*1] + dataptr[DCTSIZE*6]; |
---|
2488 | tmp2 = dataptr[DCTSIZE*2] + dataptr[DCTSIZE*5]; |
---|
2489 | tmp3 = dataptr[DCTSIZE*3] + dataptr[DCTSIZE*4]; |
---|
2490 | |
---|
2491 | tmp10 = tmp0 + tmp3; |
---|
2492 | tmp12 = tmp0 - tmp3; |
---|
2493 | tmp11 = tmp1 + tmp2; |
---|
2494 | tmp13 = tmp1 - tmp2; |
---|
2495 | |
---|
2496 | tmp0 = dataptr[DCTSIZE*0] - dataptr[DCTSIZE*7]; |
---|
2497 | tmp1 = dataptr[DCTSIZE*1] - dataptr[DCTSIZE*6]; |
---|
2498 | tmp2 = dataptr[DCTSIZE*2] - dataptr[DCTSIZE*5]; |
---|
2499 | tmp3 = dataptr[DCTSIZE*3] - dataptr[DCTSIZE*4]; |
---|
2500 | |
---|
2501 | dataptr[DCTSIZE*0] = (DCTELEM) DESCALE(tmp10 + tmp11, PASS1_BITS+1); |
---|
2502 | dataptr[DCTSIZE*4] = (DCTELEM) DESCALE(tmp10 - tmp11, PASS1_BITS+1); |
---|
2503 | |
---|
2504 | z1 = MULTIPLY(tmp12 + tmp13, FIX_0_541196100); |
---|
2505 | dataptr[DCTSIZE*2] = (DCTELEM) DESCALE(z1 + MULTIPLY(tmp12, FIX_0_765366865), |
---|
2506 | CONST_BITS+PASS1_BITS+1); |
---|
2507 | dataptr[DCTSIZE*6] = (DCTELEM) DESCALE(z1 - MULTIPLY(tmp13, FIX_1_847759065), |
---|
2508 | CONST_BITS+PASS1_BITS+1); |
---|
2509 | |
---|
2510 | /* Odd part per figure 8 --- note paper omits factor of sqrt(2). |
---|
2511 | * 8-point FDCT kernel, cK represents sqrt(2) * cos(K*pi/16). |
---|
2512 | * i0..i3 in the paper are tmp0..tmp3 here. |
---|
2513 | */ |
---|
2514 | |
---|
2515 | tmp10 = tmp0 + tmp3; |
---|
2516 | tmp11 = tmp1 + tmp2; |
---|
2517 | tmp12 = tmp0 + tmp2; |
---|
2518 | tmp13 = tmp1 + tmp3; |
---|
2519 | z1 = MULTIPLY(tmp12 + tmp13, FIX_1_175875602); /* c3 */ |
---|
2520 | |
---|
2521 | tmp0 = MULTIPLY(tmp0, FIX_1_501321110); /* c1+c3-c5-c7 */ |
---|
2522 | tmp1 = MULTIPLY(tmp1, FIX_3_072711026); /* c1+c3+c5-c7 */ |
---|
2523 | tmp2 = MULTIPLY(tmp2, FIX_2_053119869); /* c1+c3-c5+c7 */ |
---|
2524 | tmp3 = MULTIPLY(tmp3, FIX_0_298631336); /* -c1+c3+c5-c7 */ |
---|
2525 | tmp10 = MULTIPLY(tmp10, - FIX_0_899976223); /* c7-c3 */ |
---|
2526 | tmp11 = MULTIPLY(tmp11, - FIX_2_562915447); /* -c1-c3 */ |
---|
2527 | tmp12 = MULTIPLY(tmp12, - FIX_0_390180644); /* c5-c3 */ |
---|
2528 | tmp13 = MULTIPLY(tmp13, - FIX_1_961570560); /* -c3-c5 */ |
---|
2529 | |
---|
2530 | tmp12 += z1; |
---|
2531 | tmp13 += z1; |
---|
2532 | |
---|
2533 | dataptr[DCTSIZE*1] = (DCTELEM) DESCALE(tmp0 + tmp10 + tmp12, |
---|
2534 | CONST_BITS+PASS1_BITS+1); |
---|
2535 | dataptr[DCTSIZE*3] = (DCTELEM) DESCALE(tmp1 + tmp11 + tmp13, |
---|
2536 | CONST_BITS+PASS1_BITS+1); |
---|
2537 | dataptr[DCTSIZE*5] = (DCTELEM) DESCALE(tmp2 + tmp11 + tmp12, |
---|
2538 | CONST_BITS+PASS1_BITS+1); |
---|
2539 | dataptr[DCTSIZE*7] = (DCTELEM) DESCALE(tmp3 + tmp10 + tmp13, |
---|
2540 | CONST_BITS+PASS1_BITS+1); |
---|
2541 | |
---|
2542 | dataptr++; /* advance pointer to next column */ |
---|
2543 | } |
---|
2544 | } |
---|
2545 | |
---|
2546 | |
---|
2547 | /* |
---|
2548 | * Perform the forward DCT on a 14x7 sample block. |
---|
2549 | * |
---|
2550 | * 14-point FDCT in pass 1 (rows), 7-point in pass 2 (columns). |
---|
2551 | */ |
---|
2552 | |
---|
2553 | GLOBAL(void) |
---|
2554 | jpeg_fdct_14x7 (DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col) |
---|
2555 | { |
---|
2556 | INT32 tmp0, tmp1, tmp2, tmp3, tmp4, tmp5, tmp6; |
---|
2557 | INT32 tmp10, tmp11, tmp12, tmp13, tmp14, tmp15, tmp16; |
---|
2558 | INT32 z1, z2, z3; |
---|
2559 | DCTELEM *dataptr; |
---|
2560 | JSAMPROW elemptr; |
---|
2561 | int ctr; |
---|
2562 | SHIFT_TEMPS |
---|
2563 | |
---|
2564 | /* Zero bottom row of output coefficient block. */ |
---|
2565 | MEMZERO(&data[DCTSIZE*7], SIZEOF(DCTELEM) * DCTSIZE); |
---|
2566 | |
---|
2567 | /* Pass 1: process rows. */ |
---|
2568 | /* Note results are scaled up by sqrt(8) compared to a true DCT; */ |
---|
2569 | /* furthermore, we scale the results by 2**PASS1_BITS. */ |
---|
2570 | /* 14-point FDCT kernel, cK represents sqrt(2) * cos(K*pi/28). */ |
---|
2571 | |
---|
2572 | dataptr = data; |
---|
2573 | for (ctr = 0; ctr < 7; ctr++) { |
---|
2574 | elemptr = sample_data[ctr] + start_col; |
---|
2575 | |
---|
2576 | /* Even part */ |
---|
2577 | |
---|
2578 | tmp0 = GETJSAMPLE(elemptr[0]) + GETJSAMPLE(elemptr[13]); |
---|
2579 | tmp1 = GETJSAMPLE(elemptr[1]) + GETJSAMPLE(elemptr[12]); |
---|
2580 | tmp2 = GETJSAMPLE(elemptr[2]) + GETJSAMPLE(elemptr[11]); |
---|
2581 | tmp13 = GETJSAMPLE(elemptr[3]) + GETJSAMPLE(elemptr[10]); |
---|
2582 | tmp4 = GETJSAMPLE(elemptr[4]) + GETJSAMPLE(elemptr[9]); |
---|
2583 | tmp5 = GETJSAMPLE(elemptr[5]) + GETJSAMPLE(elemptr[8]); |
---|
2584 | tmp6 = GETJSAMPLE(elemptr[6]) + GETJSAMPLE(elemptr[7]); |
---|
2585 | |
---|
2586 | tmp10 = tmp0 + tmp6; |
---|
2587 | tmp14 = tmp0 - tmp6; |
---|
2588 | tmp11 = tmp1 + tmp5; |
---|
2589 | tmp15 = tmp1 - tmp5; |
---|
2590 | tmp12 = tmp2 + tmp4; |
---|
2591 | tmp16 = tmp2 - tmp4; |
---|
2592 | |
---|
2593 | tmp0 = GETJSAMPLE(elemptr[0]) - GETJSAMPLE(elemptr[13]); |
---|
2594 | tmp1 = GETJSAMPLE(elemptr[1]) - GETJSAMPLE(elemptr[12]); |
---|
2595 | tmp2 = GETJSAMPLE(elemptr[2]) - GETJSAMPLE(elemptr[11]); |
---|
2596 | tmp3 = GETJSAMPLE(elemptr[3]) - GETJSAMPLE(elemptr[10]); |
---|
2597 | tmp4 = GETJSAMPLE(elemptr[4]) - GETJSAMPLE(elemptr[9]); |
---|
2598 | tmp5 = GETJSAMPLE(elemptr[5]) - GETJSAMPLE(elemptr[8]); |
---|
2599 | tmp6 = GETJSAMPLE(elemptr[6]) - GETJSAMPLE(elemptr[7]); |
---|
2600 | |
---|
2601 | /* Apply unsigned->signed conversion */ |
---|
2602 | dataptr[0] = (DCTELEM) |
---|
2603 | ((tmp10 + tmp11 + tmp12 + tmp13 - 14 * CENTERJSAMPLE) << PASS1_BITS); |
---|
2604 | tmp13 += tmp13; |
---|
2605 | dataptr[4] = (DCTELEM) |
---|
2606 | DESCALE(MULTIPLY(tmp10 - tmp13, FIX(1.274162392)) + /* c4 */ |
---|
2607 | MULTIPLY(tmp11 - tmp13, FIX(0.314692123)) - /* c12 */ |
---|
2608 | MULTIPLY(tmp12 - tmp13, FIX(0.881747734)), /* c8 */ |
---|
2609 | CONST_BITS-PASS1_BITS); |
---|
2610 | |
---|
2611 | tmp10 = MULTIPLY(tmp14 + tmp15, FIX(1.105676686)); /* c6 */ |
---|
2612 | |
---|
2613 | dataptr[2] = (DCTELEM) |
---|
2614 | DESCALE(tmp10 + MULTIPLY(tmp14, FIX(0.273079590)) /* c2-c6 */ |
---|
2615 | + MULTIPLY(tmp16, FIX(0.613604268)), /* c10 */ |
---|
2616 | CONST_BITS-PASS1_BITS); |
---|
2617 | dataptr[6] = (DCTELEM) |
---|
2618 | DESCALE(tmp10 - MULTIPLY(tmp15, FIX(1.719280954)) /* c6+c10 */ |
---|
2619 | - MULTIPLY(tmp16, FIX(1.378756276)), /* c2 */ |
---|
2620 | CONST_BITS-PASS1_BITS); |
---|
2621 | |
---|
2622 | /* Odd part */ |
---|
2623 | |
---|
2624 | tmp10 = tmp1 + tmp2; |
---|
2625 | tmp11 = tmp5 - tmp4; |
---|
2626 | dataptr[7] = (DCTELEM) ((tmp0 - tmp10 + tmp3 - tmp11 - tmp6) << PASS1_BITS); |
---|
2627 | tmp3 <<= CONST_BITS; |
---|
2628 | tmp10 = MULTIPLY(tmp10, - FIX(0.158341681)); /* -c13 */ |
---|
2629 | tmp11 = MULTIPLY(tmp11, FIX(1.405321284)); /* c1 */ |
---|
2630 | tmp10 += tmp11 - tmp3; |
---|
2631 | tmp11 = MULTIPLY(tmp0 + tmp2, FIX(1.197448846)) + /* c5 */ |
---|
2632 | MULTIPLY(tmp4 + tmp6, FIX(0.752406978)); /* c9 */ |
---|
2633 | dataptr[5] = (DCTELEM) |
---|
2634 | DESCALE(tmp10 + tmp11 - MULTIPLY(tmp2, FIX(2.373959773)) /* c3+c5-c13 */ |
---|
2635 | + MULTIPLY(tmp4, FIX(1.119999435)), /* c1+c11-c9 */ |
---|
2636 | CONST_BITS-PASS1_BITS); |
---|
2637 | tmp12 = MULTIPLY(tmp0 + tmp1, FIX(1.334852607)) + /* c3 */ |
---|
2638 | MULTIPLY(tmp5 - tmp6, FIX(0.467085129)); /* c11 */ |
---|
2639 | dataptr[3] = (DCTELEM) |
---|
2640 | DESCALE(tmp10 + tmp12 - MULTIPLY(tmp1, FIX(0.424103948)) /* c3-c9-c13 */ |
---|
2641 | - MULTIPLY(tmp5, FIX(3.069855259)), /* c1+c5+c11 */ |
---|
2642 | CONST_BITS-PASS1_BITS); |
---|
2643 | dataptr[1] = (DCTELEM) |
---|
2644 | DESCALE(tmp11 + tmp12 + tmp3 + tmp6 - |
---|
2645 | MULTIPLY(tmp0 + tmp6, FIX(1.126980169)), /* c3+c5-c1 */ |
---|
2646 | CONST_BITS-PASS1_BITS); |
---|
2647 | |
---|
2648 | dataptr += DCTSIZE; /* advance pointer to next row */ |
---|
2649 | } |
---|
2650 | |
---|
2651 | /* Pass 2: process columns. |
---|
2652 | * We remove the PASS1_BITS scaling, but leave the results scaled up |
---|
2653 | * by an overall factor of 8. |
---|
2654 | * We must also scale the output by (8/14)*(8/7) = 32/49, which we |
---|
2655 | * partially fold into the constant multipliers and final shifting: |
---|
2656 | * 7-point FDCT kernel, cK represents sqrt(2) * cos(K*pi/14) * 64/49. |
---|
2657 | */ |
---|
2658 | |
---|
2659 | dataptr = data; |
---|
2660 | for (ctr = DCTSIZE-1; ctr >= 0; ctr--) { |
---|
2661 | /* Even part */ |
---|
2662 | |
---|
2663 | tmp0 = dataptr[DCTSIZE*0] + dataptr[DCTSIZE*6]; |
---|
2664 | tmp1 = dataptr[DCTSIZE*1] + dataptr[DCTSIZE*5]; |
---|
2665 | tmp2 = dataptr[DCTSIZE*2] + dataptr[DCTSIZE*4]; |
---|
2666 | tmp3 = dataptr[DCTSIZE*3]; |
---|
2667 | |
---|
2668 | tmp10 = dataptr[DCTSIZE*0] - dataptr[DCTSIZE*6]; |
---|
2669 | tmp11 = dataptr[DCTSIZE*1] - dataptr[DCTSIZE*5]; |
---|
2670 | tmp12 = dataptr[DCTSIZE*2] - dataptr[DCTSIZE*4]; |
---|
2671 | |
---|
2672 | z1 = tmp0 + tmp2; |
---|
2673 | dataptr[DCTSIZE*0] = (DCTELEM) |
---|
2674 | DESCALE(MULTIPLY(z1 + tmp1 + tmp3, FIX(1.306122449)), /* 64/49 */ |
---|
2675 | CONST_BITS+PASS1_BITS+1); |
---|
2676 | tmp3 += tmp3; |
---|
2677 | z1 -= tmp3; |
---|
2678 | z1 -= tmp3; |
---|
2679 | z1 = MULTIPLY(z1, FIX(0.461784020)); /* (c2+c6-c4)/2 */ |
---|
2680 | z2 = MULTIPLY(tmp0 - tmp2, FIX(1.202428084)); /* (c2+c4-c6)/2 */ |
---|
2681 | z3 = MULTIPLY(tmp1 - tmp2, FIX(0.411026446)); /* c6 */ |
---|
2682 | dataptr[DCTSIZE*2] = (DCTELEM) DESCALE(z1 + z2 + z3, CONST_BITS+PASS1_BITS+1); |
---|
2683 | z1 -= z2; |
---|
2684 | z2 = MULTIPLY(tmp0 - tmp1, FIX(1.151670509)); /* c4 */ |
---|
2685 | dataptr[DCTSIZE*4] = (DCTELEM) |
---|
2686 | DESCALE(z2 + z3 - MULTIPLY(tmp1 - tmp3, FIX(0.923568041)), /* c2+c6-c4 */ |
---|
2687 | CONST_BITS+PASS1_BITS+1); |
---|
2688 | dataptr[DCTSIZE*6] = (DCTELEM) DESCALE(z1 + z2, CONST_BITS+PASS1_BITS+1); |
---|
2689 | |
---|
2690 | /* Odd part */ |
---|
2691 | |
---|
2692 | tmp1 = MULTIPLY(tmp10 + tmp11, FIX(1.221765677)); /* (c3+c1-c5)/2 */ |
---|
2693 | tmp2 = MULTIPLY(tmp10 - tmp11, FIX(0.222383464)); /* (c3+c5-c1)/2 */ |
---|
2694 | tmp0 = tmp1 - tmp2; |
---|
2695 | tmp1 += tmp2; |
---|
2696 | tmp2 = MULTIPLY(tmp11 + tmp12, - FIX(1.800824523)); /* -c1 */ |
---|
2697 | tmp1 += tmp2; |
---|
2698 | tmp3 = MULTIPLY(tmp10 + tmp12, FIX(0.801442310)); /* c5 */ |
---|
2699 | tmp0 += tmp3; |
---|
2700 | tmp2 += tmp3 + MULTIPLY(tmp12, FIX(2.443531355)); /* c3+c1-c5 */ |
---|
2701 | |
---|
2702 | dataptr[DCTSIZE*1] = (DCTELEM) DESCALE(tmp0, CONST_BITS+PASS1_BITS+1); |
---|
2703 | dataptr[DCTSIZE*3] = (DCTELEM) DESCALE(tmp1, CONST_BITS+PASS1_BITS+1); |
---|
2704 | dataptr[DCTSIZE*5] = (DCTELEM) DESCALE(tmp2, CONST_BITS+PASS1_BITS+1); |
---|
2705 | |
---|
2706 | dataptr++; /* advance pointer to next column */ |
---|
2707 | } |
---|
2708 | } |
---|
2709 | |
---|
2710 | |
---|
2711 | /* |
---|
2712 | * Perform the forward DCT on a 12x6 sample block. |
---|
2713 | * |
---|
2714 | * 12-point FDCT in pass 1 (rows), 6-point in pass 2 (columns). |
---|
2715 | */ |
---|
2716 | |
---|
2717 | GLOBAL(void) |
---|
2718 | jpeg_fdct_12x6 (DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col) |
---|
2719 | { |
---|
2720 | INT32 tmp0, tmp1, tmp2, tmp3, tmp4, tmp5; |
---|
2721 | INT32 tmp10, tmp11, tmp12, tmp13, tmp14, tmp15; |
---|
2722 | DCTELEM *dataptr; |
---|
2723 | JSAMPROW elemptr; |
---|
2724 | int ctr; |
---|
2725 | SHIFT_TEMPS |
---|
2726 | |
---|
2727 | /* Zero 2 bottom rows of output coefficient block. */ |
---|
2728 | MEMZERO(&data[DCTSIZE*6], SIZEOF(DCTELEM) * DCTSIZE * 2); |
---|
2729 | |
---|
2730 | /* Pass 1: process rows. */ |
---|
2731 | /* Note results are scaled up by sqrt(8) compared to a true DCT; */ |
---|
2732 | /* furthermore, we scale the results by 2**PASS1_BITS. */ |
---|
2733 | /* 12-point FDCT kernel, cK represents sqrt(2) * cos(K*pi/24). */ |
---|
2734 | |
---|
2735 | dataptr = data; |
---|
2736 | for (ctr = 0; ctr < 6; ctr++) { |
---|
2737 | elemptr = sample_data[ctr] + start_col; |
---|
2738 | |
---|
2739 | /* Even part */ |
---|
2740 | |
---|
2741 | tmp0 = GETJSAMPLE(elemptr[0]) + GETJSAMPLE(elemptr[11]); |
---|
2742 | tmp1 = GETJSAMPLE(elemptr[1]) + GETJSAMPLE(elemptr[10]); |
---|
2743 | tmp2 = GETJSAMPLE(elemptr[2]) + GETJSAMPLE(elemptr[9]); |
---|
2744 | tmp3 = GETJSAMPLE(elemptr[3]) + GETJSAMPLE(elemptr[8]); |
---|
2745 | tmp4 = GETJSAMPLE(elemptr[4]) + GETJSAMPLE(elemptr[7]); |
---|
2746 | tmp5 = GETJSAMPLE(elemptr[5]) + GETJSAMPLE(elemptr[6]); |
---|
2747 | |
---|
2748 | tmp10 = tmp0 + tmp5; |
---|
2749 | tmp13 = tmp0 - tmp5; |
---|
2750 | tmp11 = tmp1 + tmp4; |
---|
2751 | tmp14 = tmp1 - tmp4; |
---|
2752 | tmp12 = tmp2 + tmp3; |
---|
2753 | tmp15 = tmp2 - tmp3; |
---|
2754 | |
---|
2755 | tmp0 = GETJSAMPLE(elemptr[0]) - GETJSAMPLE(elemptr[11]); |
---|
2756 | tmp1 = GETJSAMPLE(elemptr[1]) - GETJSAMPLE(elemptr[10]); |
---|
2757 | tmp2 = GETJSAMPLE(elemptr[2]) - GETJSAMPLE(elemptr[9]); |
---|
2758 | tmp3 = GETJSAMPLE(elemptr[3]) - GETJSAMPLE(elemptr[8]); |
---|
2759 | tmp4 = GETJSAMPLE(elemptr[4]) - GETJSAMPLE(elemptr[7]); |
---|
2760 | tmp5 = GETJSAMPLE(elemptr[5]) - GETJSAMPLE(elemptr[6]); |
---|
2761 | |
---|
2762 | /* Apply unsigned->signed conversion */ |
---|
2763 | dataptr[0] = (DCTELEM) |
---|
2764 | ((tmp10 + tmp11 + tmp12 - 12 * CENTERJSAMPLE) << PASS1_BITS); |
---|
2765 | dataptr[6] = (DCTELEM) ((tmp13 - tmp14 - tmp15) << PASS1_BITS); |
---|
2766 | dataptr[4] = (DCTELEM) |
---|
2767 | DESCALE(MULTIPLY(tmp10 - tmp12, FIX(1.224744871)), /* c4 */ |
---|
2768 | CONST_BITS-PASS1_BITS); |
---|
2769 | dataptr[2] = (DCTELEM) |
---|
2770 | DESCALE(tmp14 - tmp15 + MULTIPLY(tmp13 + tmp15, FIX(1.366025404)), /* c2 */ |
---|
2771 | CONST_BITS-PASS1_BITS); |
---|
2772 | |
---|
2773 | /* Odd part */ |
---|
2774 | |
---|
2775 | tmp10 = MULTIPLY(tmp1 + tmp4, FIX_0_541196100); /* c9 */ |
---|
2776 | tmp14 = tmp10 + MULTIPLY(tmp1, FIX_0_765366865); /* c3-c9 */ |
---|
2777 | tmp15 = tmp10 - MULTIPLY(tmp4, FIX_1_847759065); /* c3+c9 */ |
---|
2778 | tmp12 = MULTIPLY(tmp0 + tmp2, FIX(1.121971054)); /* c5 */ |
---|
2779 | tmp13 = MULTIPLY(tmp0 + tmp3, FIX(0.860918669)); /* c7 */ |
---|
2780 | tmp10 = tmp12 + tmp13 + tmp14 - MULTIPLY(tmp0, FIX(0.580774953)) /* c5+c7-c1 */ |
---|
2781 | + MULTIPLY(tmp5, FIX(0.184591911)); /* c11 */ |
---|
2782 | tmp11 = MULTIPLY(tmp2 + tmp3, - FIX(0.184591911)); /* -c11 */ |
---|
2783 | tmp12 += tmp11 - tmp15 - MULTIPLY(tmp2, FIX(2.339493912)) /* c1+c5-c11 */ |
---|
2784 | + MULTIPLY(tmp5, FIX(0.860918669)); /* c7 */ |
---|
2785 | tmp13 += tmp11 - tmp14 + MULTIPLY(tmp3, FIX(0.725788011)) /* c1+c11-c7 */ |
---|
2786 | - MULTIPLY(tmp5, FIX(1.121971054)); /* c5 */ |
---|
2787 | tmp11 = tmp15 + MULTIPLY(tmp0 - tmp3, FIX(1.306562965)) /* c3 */ |
---|
2788 | - MULTIPLY(tmp2 + tmp5, FIX_0_541196100); /* c9 */ |
---|
2789 | |
---|
2790 | dataptr[1] = (DCTELEM) DESCALE(tmp10, CONST_BITS-PASS1_BITS); |
---|
2791 | dataptr[3] = (DCTELEM) DESCALE(tmp11, CONST_BITS-PASS1_BITS); |
---|
2792 | dataptr[5] = (DCTELEM) DESCALE(tmp12, CONST_BITS-PASS1_BITS); |
---|
2793 | dataptr[7] = (DCTELEM) DESCALE(tmp13, CONST_BITS-PASS1_BITS); |
---|
2794 | |
---|
2795 | dataptr += DCTSIZE; /* advance pointer to next row */ |
---|
2796 | } |
---|
2797 | |
---|
2798 | /* Pass 2: process columns. |
---|
2799 | * We remove the PASS1_BITS scaling, but leave the results scaled up |
---|
2800 | * by an overall factor of 8. |
---|
2801 | * We must also scale the output by (8/12)*(8/6) = 8/9, which we |
---|
2802 | * partially fold into the constant multipliers and final shifting: |
---|
2803 | * 6-point FDCT kernel, cK represents sqrt(2) * cos(K*pi/12) * 16/9. |
---|
2804 | */ |
---|
2805 | |
---|
2806 | dataptr = data; |
---|
2807 | for (ctr = DCTSIZE-1; ctr >= 0; ctr--) { |
---|
2808 | /* Even part */ |
---|
2809 | |
---|
2810 | tmp0 = dataptr[DCTSIZE*0] + dataptr[DCTSIZE*5]; |
---|
2811 | tmp11 = dataptr[DCTSIZE*1] + dataptr[DCTSIZE*4]; |
---|
2812 | tmp2 = dataptr[DCTSIZE*2] + dataptr[DCTSIZE*3]; |
---|
2813 | |
---|
2814 | tmp10 = tmp0 + tmp2; |
---|
2815 | tmp12 = tmp0 - tmp2; |
---|
2816 | |
---|
2817 | tmp0 = dataptr[DCTSIZE*0] - dataptr[DCTSIZE*5]; |
---|
2818 | tmp1 = dataptr[DCTSIZE*1] - dataptr[DCTSIZE*4]; |
---|
2819 | tmp2 = dataptr[DCTSIZE*2] - dataptr[DCTSIZE*3]; |
---|
2820 | |
---|
2821 | dataptr[DCTSIZE*0] = (DCTELEM) |
---|
2822 | DESCALE(MULTIPLY(tmp10 + tmp11, FIX(1.777777778)), /* 16/9 */ |
---|
2823 | CONST_BITS+PASS1_BITS+1); |
---|
2824 | dataptr[DCTSIZE*2] = (DCTELEM) |
---|
2825 | DESCALE(MULTIPLY(tmp12, FIX(2.177324216)), /* c2 */ |
---|
2826 | CONST_BITS+PASS1_BITS+1); |
---|
2827 | dataptr[DCTSIZE*4] = (DCTELEM) |
---|
2828 | DESCALE(MULTIPLY(tmp10 - tmp11 - tmp11, FIX(1.257078722)), /* c4 */ |
---|
2829 | CONST_BITS+PASS1_BITS+1); |
---|
2830 | |
---|
2831 | /* Odd part */ |
---|
2832 | |
---|
2833 | tmp10 = MULTIPLY(tmp0 + tmp2, FIX(0.650711829)); /* c5 */ |
---|
2834 | |
---|
2835 | dataptr[DCTSIZE*1] = (DCTELEM) |
---|
2836 | DESCALE(tmp10 + MULTIPLY(tmp0 + tmp1, FIX(1.777777778)), /* 16/9 */ |
---|
2837 | CONST_BITS+PASS1_BITS+1); |
---|
2838 | dataptr[DCTSIZE*3] = (DCTELEM) |
---|
2839 | DESCALE(MULTIPLY(tmp0 - tmp1 - tmp2, FIX(1.777777778)), /* 16/9 */ |
---|
2840 | CONST_BITS+PASS1_BITS+1); |
---|
2841 | dataptr[DCTSIZE*5] = (DCTELEM) |
---|
2842 | DESCALE(tmp10 + MULTIPLY(tmp2 - tmp1, FIX(1.777777778)), /* 16/9 */ |
---|
2843 | CONST_BITS+PASS1_BITS+1); |
---|
2844 | |
---|
2845 | dataptr++; /* advance pointer to next column */ |
---|
2846 | } |
---|
2847 | } |
---|
2848 | |
---|
2849 | |
---|
2850 | /* |
---|
2851 | * Perform the forward DCT on a 10x5 sample block. |
---|
2852 | * |
---|
2853 | * 10-point FDCT in pass 1 (rows), 5-point in pass 2 (columns). |
---|
2854 | */ |
---|
2855 | |
---|
2856 | GLOBAL(void) |
---|
2857 | jpeg_fdct_10x5 (DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col) |
---|
2858 | { |
---|
2859 | INT32 tmp0, tmp1, tmp2, tmp3, tmp4; |
---|
2860 | INT32 tmp10, tmp11, tmp12, tmp13, tmp14; |
---|
2861 | DCTELEM *dataptr; |
---|
2862 | JSAMPROW elemptr; |
---|
2863 | int ctr; |
---|
2864 | SHIFT_TEMPS |
---|
2865 | |
---|
2866 | /* Zero 3 bottom rows of output coefficient block. */ |
---|
2867 | MEMZERO(&data[DCTSIZE*5], SIZEOF(DCTELEM) * DCTSIZE * 3); |
---|
2868 | |
---|
2869 | /* Pass 1: process rows. */ |
---|
2870 | /* Note results are scaled up by sqrt(8) compared to a true DCT; */ |
---|
2871 | /* furthermore, we scale the results by 2**PASS1_BITS. */ |
---|
2872 | /* 10-point FDCT kernel, cK represents sqrt(2) * cos(K*pi/20). */ |
---|
2873 | |
---|
2874 | dataptr = data; |
---|
2875 | for (ctr = 0; ctr < 5; ctr++) { |
---|
2876 | elemptr = sample_data[ctr] + start_col; |
---|
2877 | |
---|
2878 | /* Even part */ |
---|
2879 | |
---|
2880 | tmp0 = GETJSAMPLE(elemptr[0]) + GETJSAMPLE(elemptr[9]); |
---|
2881 | tmp1 = GETJSAMPLE(elemptr[1]) + GETJSAMPLE(elemptr[8]); |
---|
2882 | tmp12 = GETJSAMPLE(elemptr[2]) + GETJSAMPLE(elemptr[7]); |
---|
2883 | tmp3 = GETJSAMPLE(elemptr[3]) + GETJSAMPLE(elemptr[6]); |
---|
2884 | tmp4 = GETJSAMPLE(elemptr[4]) + GETJSAMPLE(elemptr[5]); |
---|
2885 | |
---|
2886 | tmp10 = tmp0 + tmp4; |
---|
2887 | tmp13 = tmp0 - tmp4; |
---|
2888 | tmp11 = tmp1 + tmp3; |
---|
2889 | tmp14 = tmp1 - tmp3; |
---|
2890 | |
---|
2891 | tmp0 = GETJSAMPLE(elemptr[0]) - GETJSAMPLE(elemptr[9]); |
---|
2892 | tmp1 = GETJSAMPLE(elemptr[1]) - GETJSAMPLE(elemptr[8]); |
---|
2893 | tmp2 = GETJSAMPLE(elemptr[2]) - GETJSAMPLE(elemptr[7]); |
---|
2894 | tmp3 = GETJSAMPLE(elemptr[3]) - GETJSAMPLE(elemptr[6]); |
---|
2895 | tmp4 = GETJSAMPLE(elemptr[4]) - GETJSAMPLE(elemptr[5]); |
---|
2896 | |
---|
2897 | /* Apply unsigned->signed conversion */ |
---|
2898 | dataptr[0] = (DCTELEM) |
---|
2899 | ((tmp10 + tmp11 + tmp12 - 10 * CENTERJSAMPLE) << PASS1_BITS); |
---|
2900 | tmp12 += tmp12; |
---|
2901 | dataptr[4] = (DCTELEM) |
---|
2902 | DESCALE(MULTIPLY(tmp10 - tmp12, FIX(1.144122806)) - /* c4 */ |
---|
2903 | MULTIPLY(tmp11 - tmp12, FIX(0.437016024)), /* c8 */ |
---|
2904 | CONST_BITS-PASS1_BITS); |
---|
2905 | tmp10 = MULTIPLY(tmp13 + tmp14, FIX(0.831253876)); /* c6 */ |
---|
2906 | dataptr[2] = (DCTELEM) |
---|
2907 | DESCALE(tmp10 + MULTIPLY(tmp13, FIX(0.513743148)), /* c2-c6 */ |
---|
2908 | CONST_BITS-PASS1_BITS); |
---|
2909 | dataptr[6] = (DCTELEM) |
---|
2910 | DESCALE(tmp10 - MULTIPLY(tmp14, FIX(2.176250899)), /* c2+c6 */ |
---|
2911 | CONST_BITS-PASS1_BITS); |
---|
2912 | |
---|
2913 | /* Odd part */ |
---|
2914 | |
---|
2915 | tmp10 = tmp0 + tmp4; |
---|
2916 | tmp11 = tmp1 - tmp3; |
---|
2917 | dataptr[5] = (DCTELEM) ((tmp10 - tmp11 - tmp2) << PASS1_BITS); |
---|
2918 | tmp2 <<= CONST_BITS; |
---|
2919 | dataptr[1] = (DCTELEM) |
---|
2920 | DESCALE(MULTIPLY(tmp0, FIX(1.396802247)) + /* c1 */ |
---|
2921 | MULTIPLY(tmp1, FIX(1.260073511)) + tmp2 + /* c3 */ |
---|
2922 | MULTIPLY(tmp3, FIX(0.642039522)) + /* c7 */ |
---|
2923 | MULTIPLY(tmp4, FIX(0.221231742)), /* c9 */ |
---|
2924 | CONST_BITS-PASS1_BITS); |
---|
2925 | tmp12 = MULTIPLY(tmp0 - tmp4, FIX(0.951056516)) - /* (c3+c7)/2 */ |
---|
2926 | MULTIPLY(tmp1 + tmp3, FIX(0.587785252)); /* (c1-c9)/2 */ |
---|
2927 | tmp13 = MULTIPLY(tmp10 + tmp11, FIX(0.309016994)) + /* (c3-c7)/2 */ |
---|
2928 | (tmp11 << (CONST_BITS - 1)) - tmp2; |
---|
2929 | dataptr[3] = (DCTELEM) DESCALE(tmp12 + tmp13, CONST_BITS-PASS1_BITS); |
---|
2930 | dataptr[7] = (DCTELEM) DESCALE(tmp12 - tmp13, CONST_BITS-PASS1_BITS); |
---|
2931 | |
---|
2932 | dataptr += DCTSIZE; /* advance pointer to next row */ |
---|
2933 | } |
---|
2934 | |
---|
2935 | /* Pass 2: process columns. |
---|
2936 | * We remove the PASS1_BITS scaling, but leave the results scaled up |
---|
2937 | * by an overall factor of 8. |
---|
2938 | * We must also scale the output by (8/10)*(8/5) = 32/25, which we |
---|
2939 | * fold into the constant multipliers: |
---|
2940 | * 5-point FDCT kernel, cK represents sqrt(2) * cos(K*pi/10) * 32/25. |
---|
2941 | */ |
---|
2942 | |
---|
2943 | dataptr = data; |
---|
2944 | for (ctr = DCTSIZE-1; ctr >= 0; ctr--) { |
---|
2945 | /* Even part */ |
---|
2946 | |
---|
2947 | tmp0 = dataptr[DCTSIZE*0] + dataptr[DCTSIZE*4]; |
---|
2948 | tmp1 = dataptr[DCTSIZE*1] + dataptr[DCTSIZE*3]; |
---|
2949 | tmp2 = dataptr[DCTSIZE*2]; |
---|
2950 | |
---|
2951 | tmp10 = tmp0 + tmp1; |
---|
2952 | tmp11 = tmp0 - tmp1; |
---|
2953 | |
---|
2954 | tmp0 = dataptr[DCTSIZE*0] - dataptr[DCTSIZE*4]; |
---|
2955 | tmp1 = dataptr[DCTSIZE*1] - dataptr[DCTSIZE*3]; |
---|
2956 | |
---|
2957 | dataptr[DCTSIZE*0] = (DCTELEM) |
---|
2958 | DESCALE(MULTIPLY(tmp10 + tmp2, FIX(1.28)), /* 32/25 */ |
---|
2959 | CONST_BITS+PASS1_BITS); |
---|
2960 | tmp11 = MULTIPLY(tmp11, FIX(1.011928851)); /* (c2+c4)/2 */ |
---|
2961 | tmp10 -= tmp2 << 2; |
---|
2962 | tmp10 = MULTIPLY(tmp10, FIX(0.452548340)); /* (c2-c4)/2 */ |
---|
2963 | dataptr[DCTSIZE*2] = (DCTELEM) DESCALE(tmp11 + tmp10, CONST_BITS+PASS1_BITS); |
---|
2964 | dataptr[DCTSIZE*4] = (DCTELEM) DESCALE(tmp11 - tmp10, CONST_BITS+PASS1_BITS); |
---|
2965 | |
---|
2966 | /* Odd part */ |
---|
2967 | |
---|
2968 | tmp10 = MULTIPLY(tmp0 + tmp1, FIX(1.064004961)); /* c3 */ |
---|
2969 | |
---|
2970 | dataptr[DCTSIZE*1] = (DCTELEM) |
---|
2971 | DESCALE(tmp10 + MULTIPLY(tmp0, FIX(0.657591230)), /* c1-c3 */ |
---|
2972 | CONST_BITS+PASS1_BITS); |
---|
2973 | dataptr[DCTSIZE*3] = (DCTELEM) |
---|
2974 | DESCALE(tmp10 - MULTIPLY(tmp1, FIX(2.785601151)), /* c1+c3 */ |
---|
2975 | CONST_BITS+PASS1_BITS); |
---|
2976 | |
---|
2977 | dataptr++; /* advance pointer to next column */ |
---|
2978 | } |
---|
2979 | } |
---|
2980 | |
---|
2981 | |
---|
2982 | /* |
---|
2983 | * Perform the forward DCT on an 8x4 sample block. |
---|
2984 | * |
---|
2985 | * 8-point FDCT in pass 1 (rows), 4-point in pass 2 (columns). |
---|
2986 | */ |
---|
2987 | |
---|
2988 | GLOBAL(void) |
---|
2989 | jpeg_fdct_8x4 (DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col) |
---|
2990 | { |
---|
2991 | INT32 tmp0, tmp1, tmp2, tmp3; |
---|
2992 | INT32 tmp10, tmp11, tmp12, tmp13; |
---|
2993 | INT32 z1; |
---|
2994 | DCTELEM *dataptr; |
---|
2995 | JSAMPROW elemptr; |
---|
2996 | int ctr; |
---|
2997 | SHIFT_TEMPS |
---|
2998 | |
---|
2999 | /* Zero 4 bottom rows of output coefficient block. */ |
---|
3000 | MEMZERO(&data[DCTSIZE*4], SIZEOF(DCTELEM) * DCTSIZE * 4); |
---|
3001 | |
---|
3002 | /* Pass 1: process rows. */ |
---|
3003 | /* Note results are scaled up by sqrt(8) compared to a true DCT; */ |
---|
3004 | /* furthermore, we scale the results by 2**PASS1_BITS. */ |
---|
3005 | /* We must also scale the output by 8/4 = 2, which we add here. */ |
---|
3006 | |
---|
3007 | dataptr = data; |
---|
3008 | for (ctr = 0; ctr < 4; ctr++) { |
---|
3009 | elemptr = sample_data[ctr] + start_col; |
---|
3010 | |
---|
3011 | /* Even part per LL&M figure 1 --- note that published figure is faulty; |
---|
3012 | * rotator "sqrt(2)*c1" should be "sqrt(2)*c6". |
---|
3013 | */ |
---|
3014 | |
---|
3015 | tmp0 = GETJSAMPLE(elemptr[0]) + GETJSAMPLE(elemptr[7]); |
---|
3016 | tmp1 = GETJSAMPLE(elemptr[1]) + GETJSAMPLE(elemptr[6]); |
---|
3017 | tmp2 = GETJSAMPLE(elemptr[2]) + GETJSAMPLE(elemptr[5]); |
---|
3018 | tmp3 = GETJSAMPLE(elemptr[3]) + GETJSAMPLE(elemptr[4]); |
---|
3019 | |
---|
3020 | tmp10 = tmp0 + tmp3; |
---|
3021 | tmp12 = tmp0 - tmp3; |
---|
3022 | tmp11 = tmp1 + tmp2; |
---|
3023 | tmp13 = tmp1 - tmp2; |
---|
3024 | |
---|
3025 | tmp0 = GETJSAMPLE(elemptr[0]) - GETJSAMPLE(elemptr[7]); |
---|
3026 | tmp1 = GETJSAMPLE(elemptr[1]) - GETJSAMPLE(elemptr[6]); |
---|
3027 | tmp2 = GETJSAMPLE(elemptr[2]) - GETJSAMPLE(elemptr[5]); |
---|
3028 | tmp3 = GETJSAMPLE(elemptr[3]) - GETJSAMPLE(elemptr[4]); |
---|
3029 | |
---|
3030 | /* Apply unsigned->signed conversion */ |
---|
3031 | dataptr[0] = (DCTELEM) |
---|
3032 | ((tmp10 + tmp11 - 8 * CENTERJSAMPLE) << (PASS1_BITS+1)); |
---|
3033 | dataptr[4] = (DCTELEM) ((tmp10 - tmp11) << (PASS1_BITS+1)); |
---|
3034 | |
---|
3035 | z1 = MULTIPLY(tmp12 + tmp13, FIX_0_541196100); |
---|
3036 | /* Add fudge factor here for final descale. */ |
---|
3037 | z1 += ONE << (CONST_BITS-PASS1_BITS-2); |
---|
3038 | dataptr[2] = (DCTELEM) RIGHT_SHIFT(z1 + MULTIPLY(tmp12, FIX_0_765366865), |
---|
3039 | CONST_BITS-PASS1_BITS-1); |
---|
3040 | dataptr[6] = (DCTELEM) RIGHT_SHIFT(z1 - MULTIPLY(tmp13, FIX_1_847759065), |
---|
3041 | CONST_BITS-PASS1_BITS-1); |
---|
3042 | |
---|
3043 | /* Odd part per figure 8 --- note paper omits factor of sqrt(2). |
---|
3044 | * 8-point FDCT kernel, cK represents sqrt(2) * cos(K*pi/16). |
---|
3045 | * i0..i3 in the paper are tmp0..tmp3 here. |
---|
3046 | */ |
---|
3047 | |
---|
3048 | tmp10 = tmp0 + tmp3; |
---|
3049 | tmp11 = tmp1 + tmp2; |
---|
3050 | tmp12 = tmp0 + tmp2; |
---|
3051 | tmp13 = tmp1 + tmp3; |
---|
3052 | z1 = MULTIPLY(tmp12 + tmp13, FIX_1_175875602); /* c3 */ |
---|
3053 | /* Add fudge factor here for final descale. */ |
---|
3054 | z1 += ONE << (CONST_BITS-PASS1_BITS-2); |
---|
3055 | |
---|
3056 | tmp0 = MULTIPLY(tmp0, FIX_1_501321110); /* c1+c3-c5-c7 */ |
---|
3057 | tmp1 = MULTIPLY(tmp1, FIX_3_072711026); /* c1+c3+c5-c7 */ |
---|
3058 | tmp2 = MULTIPLY(tmp2, FIX_2_053119869); /* c1+c3-c5+c7 */ |
---|
3059 | tmp3 = MULTIPLY(tmp3, FIX_0_298631336); /* -c1+c3+c5-c7 */ |
---|
3060 | tmp10 = MULTIPLY(tmp10, - FIX_0_899976223); /* c7-c3 */ |
---|
3061 | tmp11 = MULTIPLY(tmp11, - FIX_2_562915447); /* -c1-c3 */ |
---|
3062 | tmp12 = MULTIPLY(tmp12, - FIX_0_390180644); /* c5-c3 */ |
---|
3063 | tmp13 = MULTIPLY(tmp13, - FIX_1_961570560); /* -c3-c5 */ |
---|
3064 | |
---|
3065 | tmp12 += z1; |
---|
3066 | tmp13 += z1; |
---|
3067 | |
---|
3068 | dataptr[1] = (DCTELEM) |
---|
3069 | RIGHT_SHIFT(tmp0 + tmp10 + tmp12, CONST_BITS-PASS1_BITS-1); |
---|
3070 | dataptr[3] = (DCTELEM) |
---|
3071 | RIGHT_SHIFT(tmp1 + tmp11 + tmp13, CONST_BITS-PASS1_BITS-1); |
---|
3072 | dataptr[5] = (DCTELEM) |
---|
3073 | RIGHT_SHIFT(tmp2 + tmp11 + tmp12, CONST_BITS-PASS1_BITS-1); |
---|
3074 | dataptr[7] = (DCTELEM) |
---|
3075 | RIGHT_SHIFT(tmp3 + tmp10 + tmp13, CONST_BITS-PASS1_BITS-1); |
---|
3076 | |
---|
3077 | dataptr += DCTSIZE; /* advance pointer to next row */ |
---|
3078 | } |
---|
3079 | |
---|
3080 | /* Pass 2: process columns. |
---|
3081 | * We remove the PASS1_BITS scaling, but leave the results scaled up |
---|
3082 | * by an overall factor of 8. |
---|
3083 | * 4-point FDCT kernel, cK represents sqrt(2) * cos(K*pi/16). |
---|
3084 | */ |
---|
3085 | |
---|
3086 | dataptr = data; |
---|
3087 | for (ctr = DCTSIZE-1; ctr >= 0; ctr--) { |
---|
3088 | /* Even part */ |
---|
3089 | |
---|
3090 | /* Add fudge factor here for final descale. */ |
---|
3091 | tmp0 = dataptr[DCTSIZE*0] + dataptr[DCTSIZE*3] + (ONE << (PASS1_BITS-1)); |
---|
3092 | tmp1 = dataptr[DCTSIZE*1] + dataptr[DCTSIZE*2]; |
---|
3093 | |
---|
3094 | tmp10 = dataptr[DCTSIZE*0] - dataptr[DCTSIZE*3]; |
---|
3095 | tmp11 = dataptr[DCTSIZE*1] - dataptr[DCTSIZE*2]; |
---|
3096 | |
---|
3097 | dataptr[DCTSIZE*0] = (DCTELEM) RIGHT_SHIFT(tmp0 + tmp1, PASS1_BITS); |
---|
3098 | dataptr[DCTSIZE*2] = (DCTELEM) RIGHT_SHIFT(tmp0 - tmp1, PASS1_BITS); |
---|
3099 | |
---|
3100 | /* Odd part */ |
---|
3101 | |
---|
3102 | tmp0 = MULTIPLY(tmp10 + tmp11, FIX_0_541196100); /* c6 */ |
---|
3103 | /* Add fudge factor here for final descale. */ |
---|
3104 | tmp0 += ONE << (CONST_BITS+PASS1_BITS-1); |
---|
3105 | |
---|
3106 | dataptr[DCTSIZE*1] = (DCTELEM) |
---|
3107 | RIGHT_SHIFT(tmp0 + MULTIPLY(tmp10, FIX_0_765366865), /* c2-c6 */ |
---|
3108 | CONST_BITS+PASS1_BITS); |
---|
3109 | dataptr[DCTSIZE*3] = (DCTELEM) |
---|
3110 | RIGHT_SHIFT(tmp0 - MULTIPLY(tmp11, FIX_1_847759065), /* c2+c6 */ |
---|
3111 | CONST_BITS+PASS1_BITS); |
---|
3112 | |
---|
3113 | dataptr++; /* advance pointer to next column */ |
---|
3114 | } |
---|
3115 | } |
---|
3116 | |
---|
3117 | |
---|
3118 | /* |
---|
3119 | * Perform the forward DCT on a 6x3 sample block. |
---|
3120 | * |
---|
3121 | * 6-point FDCT in pass 1 (rows), 3-point in pass 2 (columns). |
---|
3122 | */ |
---|
3123 | |
---|
3124 | GLOBAL(void) |
---|
3125 | jpeg_fdct_6x3 (DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col) |
---|
3126 | { |
---|
3127 | INT32 tmp0, tmp1, tmp2; |
---|
3128 | INT32 tmp10, tmp11, tmp12; |
---|
3129 | DCTELEM *dataptr; |
---|
3130 | JSAMPROW elemptr; |
---|
3131 | int ctr; |
---|
3132 | SHIFT_TEMPS |
---|
3133 | |
---|
3134 | /* Pre-zero output coefficient block. */ |
---|
3135 | MEMZERO(data, SIZEOF(DCTELEM) * DCTSIZE2); |
---|
3136 | |
---|
3137 | /* Pass 1: process rows. */ |
---|
3138 | /* Note results are scaled up by sqrt(8) compared to a true DCT; */ |
---|
3139 | /* furthermore, we scale the results by 2**PASS1_BITS. */ |
---|
3140 | /* We scale the results further by 2 as part of output adaption */ |
---|
3141 | /* scaling for different DCT size. */ |
---|
3142 | /* 6-point FDCT kernel, cK represents sqrt(2) * cos(K*pi/12). */ |
---|
3143 | |
---|
3144 | dataptr = data; |
---|
3145 | for (ctr = 0; ctr < 3; ctr++) { |
---|
3146 | elemptr = sample_data[ctr] + start_col; |
---|
3147 | |
---|
3148 | /* Even part */ |
---|
3149 | |
---|
3150 | tmp0 = GETJSAMPLE(elemptr[0]) + GETJSAMPLE(elemptr[5]); |
---|
3151 | tmp11 = GETJSAMPLE(elemptr[1]) + GETJSAMPLE(elemptr[4]); |
---|
3152 | tmp2 = GETJSAMPLE(elemptr[2]) + GETJSAMPLE(elemptr[3]); |
---|
3153 | |
---|
3154 | tmp10 = tmp0 + tmp2; |
---|
3155 | tmp12 = tmp0 - tmp2; |
---|
3156 | |
---|
3157 | tmp0 = GETJSAMPLE(elemptr[0]) - GETJSAMPLE(elemptr[5]); |
---|
3158 | tmp1 = GETJSAMPLE(elemptr[1]) - GETJSAMPLE(elemptr[4]); |
---|
3159 | tmp2 = GETJSAMPLE(elemptr[2]) - GETJSAMPLE(elemptr[3]); |
---|
3160 | |
---|
3161 | /* Apply unsigned->signed conversion */ |
---|
3162 | dataptr[0] = (DCTELEM) |
---|
3163 | ((tmp10 + tmp11 - 6 * CENTERJSAMPLE) << (PASS1_BITS+1)); |
---|
3164 | dataptr[2] = (DCTELEM) |
---|
3165 | DESCALE(MULTIPLY(tmp12, FIX(1.224744871)), /* c2 */ |
---|
3166 | CONST_BITS-PASS1_BITS-1); |
---|
3167 | dataptr[4] = (DCTELEM) |
---|
3168 | DESCALE(MULTIPLY(tmp10 - tmp11 - tmp11, FIX(0.707106781)), /* c4 */ |
---|
3169 | CONST_BITS-PASS1_BITS-1); |
---|
3170 | |
---|
3171 | /* Odd part */ |
---|
3172 | |
---|
3173 | tmp10 = DESCALE(MULTIPLY(tmp0 + tmp2, FIX(0.366025404)), /* c5 */ |
---|
3174 | CONST_BITS-PASS1_BITS-1); |
---|
3175 | |
---|
3176 | dataptr[1] = (DCTELEM) (tmp10 + ((tmp0 + tmp1) << (PASS1_BITS+1))); |
---|
3177 | dataptr[3] = (DCTELEM) ((tmp0 - tmp1 - tmp2) << (PASS1_BITS+1)); |
---|
3178 | dataptr[5] = (DCTELEM) (tmp10 + ((tmp2 - tmp1) << (PASS1_BITS+1))); |
---|
3179 | |
---|
3180 | dataptr += DCTSIZE; /* advance pointer to next row */ |
---|
3181 | } |
---|
3182 | |
---|
3183 | /* Pass 2: process columns. |
---|
3184 | * We remove the PASS1_BITS scaling, but leave the results scaled up |
---|
3185 | * by an overall factor of 8. |
---|
3186 | * We must also scale the output by (8/6)*(8/3) = 32/9, which we partially |
---|
3187 | * fold into the constant multipliers (other part was done in pass 1): |
---|
3188 | * 3-point FDCT kernel, cK represents sqrt(2) * cos(K*pi/6) * 16/9. |
---|
3189 | */ |
---|
3190 | |
---|
3191 | dataptr = data; |
---|
3192 | for (ctr = 0; ctr < 6; ctr++) { |
---|
3193 | /* Even part */ |
---|
3194 | |
---|
3195 | tmp0 = dataptr[DCTSIZE*0] + dataptr[DCTSIZE*2]; |
---|
3196 | tmp1 = dataptr[DCTSIZE*1]; |
---|
3197 | |
---|
3198 | tmp2 = dataptr[DCTSIZE*0] - dataptr[DCTSIZE*2]; |
---|
3199 | |
---|
3200 | dataptr[DCTSIZE*0] = (DCTELEM) |
---|
3201 | DESCALE(MULTIPLY(tmp0 + tmp1, FIX(1.777777778)), /* 16/9 */ |
---|
3202 | CONST_BITS+PASS1_BITS); |
---|
3203 | dataptr[DCTSIZE*2] = (DCTELEM) |
---|
3204 | DESCALE(MULTIPLY(tmp0 - tmp1 - tmp1, FIX(1.257078722)), /* c2 */ |
---|
3205 | CONST_BITS+PASS1_BITS); |
---|
3206 | |
---|
3207 | /* Odd part */ |
---|
3208 | |
---|
3209 | dataptr[DCTSIZE*1] = (DCTELEM) |
---|
3210 | DESCALE(MULTIPLY(tmp2, FIX(2.177324216)), /* c1 */ |
---|
3211 | CONST_BITS+PASS1_BITS); |
---|
3212 | |
---|
3213 | dataptr++; /* advance pointer to next column */ |
---|
3214 | } |
---|
3215 | } |
---|
3216 | |
---|
3217 | |
---|
3218 | /* |
---|
3219 | * Perform the forward DCT on a 4x2 sample block. |
---|
3220 | * |
---|
3221 | * 4-point FDCT in pass 1 (rows), 2-point in pass 2 (columns). |
---|
3222 | */ |
---|
3223 | |
---|
3224 | GLOBAL(void) |
---|
3225 | jpeg_fdct_4x2 (DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col) |
---|
3226 | { |
---|
3227 | INT32 tmp0, tmp1; |
---|
3228 | INT32 tmp10, tmp11; |
---|
3229 | DCTELEM *dataptr; |
---|
3230 | JSAMPROW elemptr; |
---|
3231 | int ctr; |
---|
3232 | SHIFT_TEMPS |
---|
3233 | |
---|
3234 | /* Pre-zero output coefficient block. */ |
---|
3235 | MEMZERO(data, SIZEOF(DCTELEM) * DCTSIZE2); |
---|
3236 | |
---|
3237 | /* Pass 1: process rows. */ |
---|
3238 | /* Note results are scaled up by sqrt(8) compared to a true DCT; */ |
---|
3239 | /* furthermore, we scale the results by 2**PASS1_BITS. */ |
---|
3240 | /* We must also scale the output by (8/4)*(8/2) = 2**3, which we add here. */ |
---|
3241 | /* 4-point FDCT kernel, */ |
---|
3242 | /* cK represents sqrt(2) * cos(K*pi/16) [refers to 8-point FDCT]. */ |
---|
3243 | |
---|
3244 | dataptr = data; |
---|
3245 | for (ctr = 0; ctr < 2; ctr++) { |
---|
3246 | elemptr = sample_data[ctr] + start_col; |
---|
3247 | |
---|
3248 | /* Even part */ |
---|
3249 | |
---|
3250 | tmp0 = GETJSAMPLE(elemptr[0]) + GETJSAMPLE(elemptr[3]); |
---|
3251 | tmp1 = GETJSAMPLE(elemptr[1]) + GETJSAMPLE(elemptr[2]); |
---|
3252 | |
---|
3253 | tmp10 = GETJSAMPLE(elemptr[0]) - GETJSAMPLE(elemptr[3]); |
---|
3254 | tmp11 = GETJSAMPLE(elemptr[1]) - GETJSAMPLE(elemptr[2]); |
---|
3255 | |
---|
3256 | /* Apply unsigned->signed conversion */ |
---|
3257 | dataptr[0] = (DCTELEM) |
---|
3258 | ((tmp0 + tmp1 - 4 * CENTERJSAMPLE) << (PASS1_BITS+3)); |
---|
3259 | dataptr[2] = (DCTELEM) ((tmp0 - tmp1) << (PASS1_BITS+3)); |
---|
3260 | |
---|
3261 | /* Odd part */ |
---|
3262 | |
---|
3263 | tmp0 = MULTIPLY(tmp10 + tmp11, FIX_0_541196100); /* c6 */ |
---|
3264 | /* Add fudge factor here for final descale. */ |
---|
3265 | tmp0 += ONE << (CONST_BITS-PASS1_BITS-4); |
---|
3266 | |
---|
3267 | dataptr[1] = (DCTELEM) |
---|
3268 | RIGHT_SHIFT(tmp0 + MULTIPLY(tmp10, FIX_0_765366865), /* c2-c6 */ |
---|
3269 | CONST_BITS-PASS1_BITS-3); |
---|
3270 | dataptr[3] = (DCTELEM) |
---|
3271 | RIGHT_SHIFT(tmp0 - MULTIPLY(tmp11, FIX_1_847759065), /* c2+c6 */ |
---|
3272 | CONST_BITS-PASS1_BITS-3); |
---|
3273 | |
---|
3274 | dataptr += DCTSIZE; /* advance pointer to next row */ |
---|
3275 | } |
---|
3276 | |
---|
3277 | /* Pass 2: process columns. |
---|
3278 | * We remove the PASS1_BITS scaling, but leave the results scaled up |
---|
3279 | * by an overall factor of 8. |
---|
3280 | */ |
---|
3281 | |
---|
3282 | dataptr = data; |
---|
3283 | for (ctr = 0; ctr < 4; ctr++) { |
---|
3284 | /* Even part */ |
---|
3285 | |
---|
3286 | /* Add fudge factor here for final descale. */ |
---|
3287 | tmp0 = dataptr[DCTSIZE*0] + (ONE << (PASS1_BITS-1)); |
---|
3288 | tmp1 = dataptr[DCTSIZE*1]; |
---|
3289 | |
---|
3290 | dataptr[DCTSIZE*0] = (DCTELEM) RIGHT_SHIFT(tmp0 + tmp1, PASS1_BITS); |
---|
3291 | |
---|
3292 | /* Odd part */ |
---|
3293 | |
---|
3294 | dataptr[DCTSIZE*1] = (DCTELEM) RIGHT_SHIFT(tmp0 - tmp1, PASS1_BITS); |
---|
3295 | |
---|
3296 | dataptr++; /* advance pointer to next column */ |
---|
3297 | } |
---|
3298 | } |
---|
3299 | |
---|
3300 | |
---|
3301 | /* |
---|
3302 | * Perform the forward DCT on a 2x1 sample block. |
---|
3303 | * |
---|
3304 | * 2-point FDCT in pass 1 (rows), 1-point in pass 2 (columns). |
---|
3305 | */ |
---|
3306 | |
---|
3307 | GLOBAL(void) |
---|
3308 | jpeg_fdct_2x1 (DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col) |
---|
3309 | { |
---|
3310 | INT32 tmp0, tmp1; |
---|
3311 | JSAMPROW elemptr; |
---|
3312 | |
---|
3313 | /* Pre-zero output coefficient block. */ |
---|
3314 | MEMZERO(data, SIZEOF(DCTELEM) * DCTSIZE2); |
---|
3315 | |
---|
3316 | elemptr = sample_data[0] + start_col; |
---|
3317 | |
---|
3318 | tmp0 = GETJSAMPLE(elemptr[0]); |
---|
3319 | tmp1 = GETJSAMPLE(elemptr[1]); |
---|
3320 | |
---|
3321 | /* We leave the results scaled up by an overall factor of 8. |
---|
3322 | * We must also scale the output by (8/2)*(8/1) = 2**5. |
---|
3323 | */ |
---|
3324 | |
---|
3325 | /* Even part */ |
---|
3326 | /* Apply unsigned->signed conversion */ |
---|
3327 | data[0] = (DCTELEM) ((tmp0 + tmp1 - 2 * CENTERJSAMPLE) << 5); |
---|
3328 | |
---|
3329 | /* Odd part */ |
---|
3330 | data[1] = (DCTELEM) ((tmp0 - tmp1) << 5); |
---|
3331 | } |
---|
3332 | |
---|
3333 | |
---|
3334 | /* |
---|
3335 | * Perform the forward DCT on an 8x16 sample block. |
---|
3336 | * |
---|
3337 | * 8-point FDCT in pass 1 (rows), 16-point in pass 2 (columns). |
---|
3338 | */ |
---|
3339 | |
---|
3340 | GLOBAL(void) |
---|
3341 | jpeg_fdct_8x16 (DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col) |
---|
3342 | { |
---|
3343 | INT32 tmp0, tmp1, tmp2, tmp3, tmp4, tmp5, tmp6, tmp7; |
---|
3344 | INT32 tmp10, tmp11, tmp12, tmp13, tmp14, tmp15, tmp16, tmp17; |
---|
3345 | INT32 z1; |
---|
3346 | DCTELEM workspace[DCTSIZE2]; |
---|
3347 | DCTELEM *dataptr; |
---|
3348 | DCTELEM *wsptr; |
---|
3349 | JSAMPROW elemptr; |
---|
3350 | int ctr; |
---|
3351 | SHIFT_TEMPS |
---|
3352 | |
---|
3353 | /* Pass 1: process rows. */ |
---|
3354 | /* Note results are scaled up by sqrt(8) compared to a true DCT; */ |
---|
3355 | /* furthermore, we scale the results by 2**PASS1_BITS. */ |
---|
3356 | |
---|
3357 | dataptr = data; |
---|
3358 | ctr = 0; |
---|
3359 | for (;;) { |
---|
3360 | elemptr = sample_data[ctr] + start_col; |
---|
3361 | |
---|
3362 | /* Even part per LL&M figure 1 --- note that published figure is faulty; |
---|
3363 | * rotator "sqrt(2)*c1" should be "sqrt(2)*c6". |
---|
3364 | */ |
---|
3365 | |
---|
3366 | tmp0 = GETJSAMPLE(elemptr[0]) + GETJSAMPLE(elemptr[7]); |
---|
3367 | tmp1 = GETJSAMPLE(elemptr[1]) + GETJSAMPLE(elemptr[6]); |
---|
3368 | tmp2 = GETJSAMPLE(elemptr[2]) + GETJSAMPLE(elemptr[5]); |
---|
3369 | tmp3 = GETJSAMPLE(elemptr[3]) + GETJSAMPLE(elemptr[4]); |
---|
3370 | |
---|
3371 | tmp10 = tmp0 + tmp3; |
---|
3372 | tmp12 = tmp0 - tmp3; |
---|
3373 | tmp11 = tmp1 + tmp2; |
---|
3374 | tmp13 = tmp1 - tmp2; |
---|
3375 | |
---|
3376 | tmp0 = GETJSAMPLE(elemptr[0]) - GETJSAMPLE(elemptr[7]); |
---|
3377 | tmp1 = GETJSAMPLE(elemptr[1]) - GETJSAMPLE(elemptr[6]); |
---|
3378 | tmp2 = GETJSAMPLE(elemptr[2]) - GETJSAMPLE(elemptr[5]); |
---|
3379 | tmp3 = GETJSAMPLE(elemptr[3]) - GETJSAMPLE(elemptr[4]); |
---|
3380 | |
---|
3381 | /* Apply unsigned->signed conversion */ |
---|
3382 | dataptr[0] = (DCTELEM) ((tmp10 + tmp11 - 8 * CENTERJSAMPLE) << PASS1_BITS); |
---|
3383 | dataptr[4] = (DCTELEM) ((tmp10 - tmp11) << PASS1_BITS); |
---|
3384 | |
---|
3385 | z1 = MULTIPLY(tmp12 + tmp13, FIX_0_541196100); |
---|
3386 | dataptr[2] = (DCTELEM) DESCALE(z1 + MULTIPLY(tmp12, FIX_0_765366865), |
---|
3387 | CONST_BITS-PASS1_BITS); |
---|
3388 | dataptr[6] = (DCTELEM) DESCALE(z1 - MULTIPLY(tmp13, FIX_1_847759065), |
---|
3389 | CONST_BITS-PASS1_BITS); |
---|
3390 | |
---|
3391 | /* Odd part per figure 8 --- note paper omits factor of sqrt(2). |
---|
3392 | * 8-point FDCT kernel, cK represents sqrt(2) * cos(K*pi/16). |
---|
3393 | * i0..i3 in the paper are tmp0..tmp3 here. |
---|
3394 | */ |
---|
3395 | |
---|
3396 | tmp10 = tmp0 + tmp3; |
---|
3397 | tmp11 = tmp1 + tmp2; |
---|
3398 | tmp12 = tmp0 + tmp2; |
---|
3399 | tmp13 = tmp1 + tmp3; |
---|
3400 | z1 = MULTIPLY(tmp12 + tmp13, FIX_1_175875602); /* c3 */ |
---|
3401 | |
---|
3402 | tmp0 = MULTIPLY(tmp0, FIX_1_501321110); /* c1+c3-c5-c7 */ |
---|
3403 | tmp1 = MULTIPLY(tmp1, FIX_3_072711026); /* c1+c3+c5-c7 */ |
---|
3404 | tmp2 = MULTIPLY(tmp2, FIX_2_053119869); /* c1+c3-c5+c7 */ |
---|
3405 | tmp3 = MULTIPLY(tmp3, FIX_0_298631336); /* -c1+c3+c5-c7 */ |
---|
3406 | tmp10 = MULTIPLY(tmp10, - FIX_0_899976223); /* c7-c3 */ |
---|
3407 | tmp11 = MULTIPLY(tmp11, - FIX_2_562915447); /* -c1-c3 */ |
---|
3408 | tmp12 = MULTIPLY(tmp12, - FIX_0_390180644); /* c5-c3 */ |
---|
3409 | tmp13 = MULTIPLY(tmp13, - FIX_1_961570560); /* -c3-c5 */ |
---|
3410 | |
---|
3411 | tmp12 += z1; |
---|
3412 | tmp13 += z1; |
---|
3413 | |
---|
3414 | dataptr[1] = (DCTELEM) DESCALE(tmp0 + tmp10 + tmp12, CONST_BITS-PASS1_BITS); |
---|
3415 | dataptr[3] = (DCTELEM) DESCALE(tmp1 + tmp11 + tmp13, CONST_BITS-PASS1_BITS); |
---|
3416 | dataptr[5] = (DCTELEM) DESCALE(tmp2 + tmp11 + tmp12, CONST_BITS-PASS1_BITS); |
---|
3417 | dataptr[7] = (DCTELEM) DESCALE(tmp3 + tmp10 + tmp13, CONST_BITS-PASS1_BITS); |
---|
3418 | |
---|
3419 | ctr++; |
---|
3420 | |
---|
3421 | if (ctr != DCTSIZE) { |
---|
3422 | if (ctr == DCTSIZE * 2) |
---|
3423 | break; /* Done. */ |
---|
3424 | dataptr += DCTSIZE; /* advance pointer to next row */ |
---|
3425 | } else |
---|
3426 | dataptr = workspace; /* switch pointer to extended workspace */ |
---|
3427 | } |
---|
3428 | |
---|
3429 | /* Pass 2: process columns. |
---|
3430 | * We remove the PASS1_BITS scaling, but leave the results scaled up |
---|
3431 | * by an overall factor of 8. |
---|
3432 | * We must also scale the output by 8/16 = 1/2. |
---|
3433 | * 16-point FDCT kernel, cK represents sqrt(2) * cos(K*pi/32). |
---|
3434 | */ |
---|
3435 | |
---|
3436 | dataptr = data; |
---|
3437 | wsptr = workspace; |
---|
3438 | for (ctr = DCTSIZE-1; ctr >= 0; ctr--) { |
---|
3439 | /* Even part */ |
---|
3440 | |
---|
3441 | tmp0 = dataptr[DCTSIZE*0] + wsptr[DCTSIZE*7]; |
---|
3442 | tmp1 = dataptr[DCTSIZE*1] + wsptr[DCTSIZE*6]; |
---|
3443 | tmp2 = dataptr[DCTSIZE*2] + wsptr[DCTSIZE*5]; |
---|
3444 | tmp3 = dataptr[DCTSIZE*3] + wsptr[DCTSIZE*4]; |
---|
3445 | tmp4 = dataptr[DCTSIZE*4] + wsptr[DCTSIZE*3]; |
---|
3446 | tmp5 = dataptr[DCTSIZE*5] + wsptr[DCTSIZE*2]; |
---|
3447 | tmp6 = dataptr[DCTSIZE*6] + wsptr[DCTSIZE*1]; |
---|
3448 | tmp7 = dataptr[DCTSIZE*7] + wsptr[DCTSIZE*0]; |
---|
3449 | |
---|
3450 | tmp10 = tmp0 + tmp7; |
---|
3451 | tmp14 = tmp0 - tmp7; |
---|
3452 | tmp11 = tmp1 + tmp6; |
---|
3453 | tmp15 = tmp1 - tmp6; |
---|
3454 | tmp12 = tmp2 + tmp5; |
---|
3455 | tmp16 = tmp2 - tmp5; |
---|
3456 | tmp13 = tmp3 + tmp4; |
---|
3457 | tmp17 = tmp3 - tmp4; |
---|
3458 | |
---|
3459 | tmp0 = dataptr[DCTSIZE*0] - wsptr[DCTSIZE*7]; |
---|
3460 | tmp1 = dataptr[DCTSIZE*1] - wsptr[DCTSIZE*6]; |
---|
3461 | tmp2 = dataptr[DCTSIZE*2] - wsptr[DCTSIZE*5]; |
---|
3462 | tmp3 = dataptr[DCTSIZE*3] - wsptr[DCTSIZE*4]; |
---|
3463 | tmp4 = dataptr[DCTSIZE*4] - wsptr[DCTSIZE*3]; |
---|
3464 | tmp5 = dataptr[DCTSIZE*5] - wsptr[DCTSIZE*2]; |
---|
3465 | tmp6 = dataptr[DCTSIZE*6] - wsptr[DCTSIZE*1]; |
---|
3466 | tmp7 = dataptr[DCTSIZE*7] - wsptr[DCTSIZE*0]; |
---|
3467 | |
---|
3468 | dataptr[DCTSIZE*0] = (DCTELEM) |
---|
3469 | DESCALE(tmp10 + tmp11 + tmp12 + tmp13, PASS1_BITS+1); |
---|
3470 | dataptr[DCTSIZE*4] = (DCTELEM) |
---|
3471 | DESCALE(MULTIPLY(tmp10 - tmp13, FIX(1.306562965)) + /* c4[16] = c2[8] */ |
---|
3472 | MULTIPLY(tmp11 - tmp12, FIX_0_541196100), /* c12[16] = c6[8] */ |
---|
3473 | CONST_BITS+PASS1_BITS+1); |
---|
3474 | |
---|
3475 | tmp10 = MULTIPLY(tmp17 - tmp15, FIX(0.275899379)) + /* c14[16] = c7[8] */ |
---|
3476 | MULTIPLY(tmp14 - tmp16, FIX(1.387039845)); /* c2[16] = c1[8] */ |
---|
3477 | |
---|
3478 | dataptr[DCTSIZE*2] = (DCTELEM) |
---|
3479 | DESCALE(tmp10 + MULTIPLY(tmp15, FIX(1.451774982)) /* c6+c14 */ |
---|
3480 | + MULTIPLY(tmp16, FIX(2.172734804)), /* c2+c10 */ |
---|
3481 | CONST_BITS+PASS1_BITS+1); |
---|
3482 | dataptr[DCTSIZE*6] = (DCTELEM) |
---|
3483 | DESCALE(tmp10 - MULTIPLY(tmp14, FIX(0.211164243)) /* c2-c6 */ |
---|
3484 | - MULTIPLY(tmp17, FIX(1.061594338)), /* c10+c14 */ |
---|
3485 | CONST_BITS+PASS1_BITS+1); |
---|
3486 | |
---|
3487 | /* Odd part */ |
---|
3488 | |
---|
3489 | tmp11 = MULTIPLY(tmp0 + tmp1, FIX(1.353318001)) + /* c3 */ |
---|
3490 | MULTIPLY(tmp6 - tmp7, FIX(0.410524528)); /* c13 */ |
---|
3491 | tmp12 = MULTIPLY(tmp0 + tmp2, FIX(1.247225013)) + /* c5 */ |
---|
3492 | MULTIPLY(tmp5 + tmp7, FIX(0.666655658)); /* c11 */ |
---|
3493 | tmp13 = MULTIPLY(tmp0 + tmp3, FIX(1.093201867)) + /* c7 */ |
---|
3494 | MULTIPLY(tmp4 - tmp7, FIX(0.897167586)); /* c9 */ |
---|
3495 | tmp14 = MULTIPLY(tmp1 + tmp2, FIX(0.138617169)) + /* c15 */ |
---|
3496 | MULTIPLY(tmp6 - tmp5, FIX(1.407403738)); /* c1 */ |
---|
3497 | tmp15 = MULTIPLY(tmp1 + tmp3, - FIX(0.666655658)) + /* -c11 */ |
---|
3498 | MULTIPLY(tmp4 + tmp6, - FIX(1.247225013)); /* -c5 */ |
---|
3499 | tmp16 = MULTIPLY(tmp2 + tmp3, - FIX(1.353318001)) + /* -c3 */ |
---|
3500 | MULTIPLY(tmp5 - tmp4, FIX(0.410524528)); /* c13 */ |
---|
3501 | tmp10 = tmp11 + tmp12 + tmp13 - |
---|
3502 | MULTIPLY(tmp0, FIX(2.286341144)) + /* c7+c5+c3-c1 */ |
---|
3503 | MULTIPLY(tmp7, FIX(0.779653625)); /* c15+c13-c11+c9 */ |
---|
3504 | tmp11 += tmp14 + tmp15 + MULTIPLY(tmp1, FIX(0.071888074)) /* c9-c3-c15+c11 */ |
---|
3505 | - MULTIPLY(tmp6, FIX(1.663905119)); /* c7+c13+c1-c5 */ |
---|
3506 | tmp12 += tmp14 + tmp16 - MULTIPLY(tmp2, FIX(1.125726048)) /* c7+c5+c15-c3 */ |
---|
3507 | + MULTIPLY(tmp5, FIX(1.227391138)); /* c9-c11+c1-c13 */ |
---|
3508 | tmp13 += tmp15 + tmp16 + MULTIPLY(tmp3, FIX(1.065388962)) /* c15+c3+c11-c7 */ |
---|
3509 | + MULTIPLY(tmp4, FIX(2.167985692)); /* c1+c13+c5-c9 */ |
---|
3510 | |
---|
3511 | dataptr[DCTSIZE*1] = (DCTELEM) DESCALE(tmp10, CONST_BITS+PASS1_BITS+1); |
---|
3512 | dataptr[DCTSIZE*3] = (DCTELEM) DESCALE(tmp11, CONST_BITS+PASS1_BITS+1); |
---|
3513 | dataptr[DCTSIZE*5] = (DCTELEM) DESCALE(tmp12, CONST_BITS+PASS1_BITS+1); |
---|
3514 | dataptr[DCTSIZE*7] = (DCTELEM) DESCALE(tmp13, CONST_BITS+PASS1_BITS+1); |
---|
3515 | |
---|
3516 | dataptr++; /* advance pointer to next column */ |
---|
3517 | wsptr++; /* advance pointer to next column */ |
---|
3518 | } |
---|
3519 | } |
---|
3520 | |
---|
3521 | |
---|
3522 | /* |
---|
3523 | * Perform the forward DCT on a 7x14 sample block. |
---|
3524 | * |
---|
3525 | * 7-point FDCT in pass 1 (rows), 14-point in pass 2 (columns). |
---|
3526 | */ |
---|
3527 | |
---|
3528 | GLOBAL(void) |
---|
3529 | jpeg_fdct_7x14 (DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col) |
---|
3530 | { |
---|
3531 | INT32 tmp0, tmp1, tmp2, tmp3, tmp4, tmp5, tmp6; |
---|
3532 | INT32 tmp10, tmp11, tmp12, tmp13, tmp14, tmp15, tmp16; |
---|
3533 | INT32 z1, z2, z3; |
---|
3534 | DCTELEM workspace[8*6]; |
---|
3535 | DCTELEM *dataptr; |
---|
3536 | DCTELEM *wsptr; |
---|
3537 | JSAMPROW elemptr; |
---|
3538 | int ctr; |
---|
3539 | SHIFT_TEMPS |
---|
3540 | |
---|
3541 | /* Pre-zero output coefficient block. */ |
---|
3542 | MEMZERO(data, SIZEOF(DCTELEM) * DCTSIZE2); |
---|
3543 | |
---|
3544 | /* Pass 1: process rows. */ |
---|
3545 | /* Note results are scaled up by sqrt(8) compared to a true DCT; */ |
---|
3546 | /* furthermore, we scale the results by 2**PASS1_BITS. */ |
---|
3547 | /* 7-point FDCT kernel, cK represents sqrt(2) * cos(K*pi/14). */ |
---|
3548 | |
---|
3549 | dataptr = data; |
---|
3550 | ctr = 0; |
---|
3551 | for (;;) { |
---|
3552 | elemptr = sample_data[ctr] + start_col; |
---|
3553 | |
---|
3554 | /* Even part */ |
---|
3555 | |
---|
3556 | tmp0 = GETJSAMPLE(elemptr[0]) + GETJSAMPLE(elemptr[6]); |
---|
3557 | tmp1 = GETJSAMPLE(elemptr[1]) + GETJSAMPLE(elemptr[5]); |
---|
3558 | tmp2 = GETJSAMPLE(elemptr[2]) + GETJSAMPLE(elemptr[4]); |
---|
3559 | tmp3 = GETJSAMPLE(elemptr[3]); |
---|
3560 | |
---|
3561 | tmp10 = GETJSAMPLE(elemptr[0]) - GETJSAMPLE(elemptr[6]); |
---|
3562 | tmp11 = GETJSAMPLE(elemptr[1]) - GETJSAMPLE(elemptr[5]); |
---|
3563 | tmp12 = GETJSAMPLE(elemptr[2]) - GETJSAMPLE(elemptr[4]); |
---|
3564 | |
---|
3565 | z1 = tmp0 + tmp2; |
---|
3566 | /* Apply unsigned->signed conversion */ |
---|
3567 | dataptr[0] = (DCTELEM) |
---|
3568 | ((z1 + tmp1 + tmp3 - 7 * CENTERJSAMPLE) << PASS1_BITS); |
---|
3569 | tmp3 += tmp3; |
---|
3570 | z1 -= tmp3; |
---|
3571 | z1 -= tmp3; |
---|
3572 | z1 = MULTIPLY(z1, FIX(0.353553391)); /* (c2+c6-c4)/2 */ |
---|
3573 | z2 = MULTIPLY(tmp0 - tmp2, FIX(0.920609002)); /* (c2+c4-c6)/2 */ |
---|
3574 | z3 = MULTIPLY(tmp1 - tmp2, FIX(0.314692123)); /* c6 */ |
---|
3575 | dataptr[2] = (DCTELEM) DESCALE(z1 + z2 + z3, CONST_BITS-PASS1_BITS); |
---|
3576 | z1 -= z2; |
---|
3577 | z2 = MULTIPLY(tmp0 - tmp1, FIX(0.881747734)); /* c4 */ |
---|
3578 | dataptr[4] = (DCTELEM) |
---|
3579 | DESCALE(z2 + z3 - MULTIPLY(tmp1 - tmp3, FIX(0.707106781)), /* c2+c6-c4 */ |
---|
3580 | CONST_BITS-PASS1_BITS); |
---|
3581 | dataptr[6] = (DCTELEM) DESCALE(z1 + z2, CONST_BITS-PASS1_BITS); |
---|
3582 | |
---|
3583 | /* Odd part */ |
---|
3584 | |
---|
3585 | tmp1 = MULTIPLY(tmp10 + tmp11, FIX(0.935414347)); /* (c3+c1-c5)/2 */ |
---|
3586 | tmp2 = MULTIPLY(tmp10 - tmp11, FIX(0.170262339)); /* (c3+c5-c1)/2 */ |
---|
3587 | tmp0 = tmp1 - tmp2; |
---|
3588 | tmp1 += tmp2; |
---|
3589 | tmp2 = MULTIPLY(tmp11 + tmp12, - FIX(1.378756276)); /* -c1 */ |
---|
3590 | tmp1 += tmp2; |
---|
3591 | tmp3 = MULTIPLY(tmp10 + tmp12, FIX(0.613604268)); /* c5 */ |
---|
3592 | tmp0 += tmp3; |
---|
3593 | tmp2 += tmp3 + MULTIPLY(tmp12, FIX(1.870828693)); /* c3+c1-c5 */ |
---|
3594 | |
---|
3595 | dataptr[1] = (DCTELEM) DESCALE(tmp0, CONST_BITS-PASS1_BITS); |
---|
3596 | dataptr[3] = (DCTELEM) DESCALE(tmp1, CONST_BITS-PASS1_BITS); |
---|
3597 | dataptr[5] = (DCTELEM) DESCALE(tmp2, CONST_BITS-PASS1_BITS); |
---|
3598 | |
---|
3599 | ctr++; |
---|
3600 | |
---|
3601 | if (ctr != DCTSIZE) { |
---|
3602 | if (ctr == 14) |
---|
3603 | break; /* Done. */ |
---|
3604 | dataptr += DCTSIZE; /* advance pointer to next row */ |
---|
3605 | } else |
---|
3606 | dataptr = workspace; /* switch pointer to extended workspace */ |
---|
3607 | } |
---|
3608 | |
---|
3609 | /* Pass 2: process columns. |
---|
3610 | * We remove the PASS1_BITS scaling, but leave the results scaled up |
---|
3611 | * by an overall factor of 8. |
---|
3612 | * We must also scale the output by (8/7)*(8/14) = 32/49, which we |
---|
3613 | * fold into the constant multipliers: |
---|
3614 | * 14-point FDCT kernel, cK represents sqrt(2) * cos(K*pi/28) * 32/49. |
---|
3615 | */ |
---|
3616 | |
---|
3617 | dataptr = data; |
---|
3618 | wsptr = workspace; |
---|
3619 | for (ctr = 0; ctr < 7; ctr++) { |
---|
3620 | /* Even part */ |
---|
3621 | |
---|
3622 | tmp0 = dataptr[DCTSIZE*0] + wsptr[DCTSIZE*5]; |
---|
3623 | tmp1 = dataptr[DCTSIZE*1] + wsptr[DCTSIZE*4]; |
---|
3624 | tmp2 = dataptr[DCTSIZE*2] + wsptr[DCTSIZE*3]; |
---|
3625 | tmp13 = dataptr[DCTSIZE*3] + wsptr[DCTSIZE*2]; |
---|
3626 | tmp4 = dataptr[DCTSIZE*4] + wsptr[DCTSIZE*1]; |
---|
3627 | tmp5 = dataptr[DCTSIZE*5] + wsptr[DCTSIZE*0]; |
---|
3628 | tmp6 = dataptr[DCTSIZE*6] + dataptr[DCTSIZE*7]; |
---|
3629 | |
---|
3630 | tmp10 = tmp0 + tmp6; |
---|
3631 | tmp14 = tmp0 - tmp6; |
---|
3632 | tmp11 = tmp1 + tmp5; |
---|
3633 | tmp15 = tmp1 - tmp5; |
---|
3634 | tmp12 = tmp2 + tmp4; |
---|
3635 | tmp16 = tmp2 - tmp4; |
---|
3636 | |
---|
3637 | tmp0 = dataptr[DCTSIZE*0] - wsptr[DCTSIZE*5]; |
---|
3638 | tmp1 = dataptr[DCTSIZE*1] - wsptr[DCTSIZE*4]; |
---|
3639 | tmp2 = dataptr[DCTSIZE*2] - wsptr[DCTSIZE*3]; |
---|
3640 | tmp3 = dataptr[DCTSIZE*3] - wsptr[DCTSIZE*2]; |
---|
3641 | tmp4 = dataptr[DCTSIZE*4] - wsptr[DCTSIZE*1]; |
---|
3642 | tmp5 = dataptr[DCTSIZE*5] - wsptr[DCTSIZE*0]; |
---|
3643 | tmp6 = dataptr[DCTSIZE*6] - dataptr[DCTSIZE*7]; |
---|
3644 | |
---|
3645 | dataptr[DCTSIZE*0] = (DCTELEM) |
---|
3646 | DESCALE(MULTIPLY(tmp10 + tmp11 + tmp12 + tmp13, |
---|
3647 | FIX(0.653061224)), /* 32/49 */ |
---|
3648 | CONST_BITS+PASS1_BITS); |
---|
3649 | tmp13 += tmp13; |
---|
3650 | dataptr[DCTSIZE*4] = (DCTELEM) |
---|
3651 | DESCALE(MULTIPLY(tmp10 - tmp13, FIX(0.832106052)) + /* c4 */ |
---|
3652 | MULTIPLY(tmp11 - tmp13, FIX(0.205513223)) - /* c12 */ |
---|
3653 | MULTIPLY(tmp12 - tmp13, FIX(0.575835255)), /* c8 */ |
---|
3654 | CONST_BITS+PASS1_BITS); |
---|
3655 | |
---|
3656 | tmp10 = MULTIPLY(tmp14 + tmp15, FIX(0.722074570)); /* c6 */ |
---|
3657 | |
---|
3658 | dataptr[DCTSIZE*2] = (DCTELEM) |
---|
3659 | DESCALE(tmp10 + MULTIPLY(tmp14, FIX(0.178337691)) /* c2-c6 */ |
---|
3660 | + MULTIPLY(tmp16, FIX(0.400721155)), /* c10 */ |
---|
3661 | CONST_BITS+PASS1_BITS); |
---|
3662 | dataptr[DCTSIZE*6] = (DCTELEM) |
---|
3663 | DESCALE(tmp10 - MULTIPLY(tmp15, FIX(1.122795725)) /* c6+c10 */ |
---|
3664 | - MULTIPLY(tmp16, FIX(0.900412262)), /* c2 */ |
---|
3665 | CONST_BITS+PASS1_BITS); |
---|
3666 | |
---|
3667 | /* Odd part */ |
---|
3668 | |
---|
3669 | tmp10 = tmp1 + tmp2; |
---|
3670 | tmp11 = tmp5 - tmp4; |
---|
3671 | dataptr[DCTSIZE*7] = (DCTELEM) |
---|
3672 | DESCALE(MULTIPLY(tmp0 - tmp10 + tmp3 - tmp11 - tmp6, |
---|
3673 | FIX(0.653061224)), /* 32/49 */ |
---|
3674 | CONST_BITS+PASS1_BITS); |
---|
3675 | tmp3 = MULTIPLY(tmp3 , FIX(0.653061224)); /* 32/49 */ |
---|
3676 | tmp10 = MULTIPLY(tmp10, - FIX(0.103406812)); /* -c13 */ |
---|
3677 | tmp11 = MULTIPLY(tmp11, FIX(0.917760839)); /* c1 */ |
---|
3678 | tmp10 += tmp11 - tmp3; |
---|
3679 | tmp11 = MULTIPLY(tmp0 + tmp2, FIX(0.782007410)) + /* c5 */ |
---|
3680 | MULTIPLY(tmp4 + tmp6, FIX(0.491367823)); /* c9 */ |
---|
3681 | dataptr[DCTSIZE*5] = (DCTELEM) |
---|
3682 | DESCALE(tmp10 + tmp11 - MULTIPLY(tmp2, FIX(1.550341076)) /* c3+c5-c13 */ |
---|
3683 | + MULTIPLY(tmp4, FIX(0.731428202)), /* c1+c11-c9 */ |
---|
3684 | CONST_BITS+PASS1_BITS); |
---|
3685 | tmp12 = MULTIPLY(tmp0 + tmp1, FIX(0.871740478)) + /* c3 */ |
---|
3686 | MULTIPLY(tmp5 - tmp6, FIX(0.305035186)); /* c11 */ |
---|
3687 | dataptr[DCTSIZE*3] = (DCTELEM) |
---|
3688 | DESCALE(tmp10 + tmp12 - MULTIPLY(tmp1, FIX(0.276965844)) /* c3-c9-c13 */ |
---|
3689 | - MULTIPLY(tmp5, FIX(2.004803435)), /* c1+c5+c11 */ |
---|
3690 | CONST_BITS+PASS1_BITS); |
---|
3691 | dataptr[DCTSIZE*1] = (DCTELEM) |
---|
3692 | DESCALE(tmp11 + tmp12 + tmp3 |
---|
3693 | - MULTIPLY(tmp0, FIX(0.735987049)) /* c3+c5-c1 */ |
---|
3694 | - MULTIPLY(tmp6, FIX(0.082925825)), /* c9-c11-c13 */ |
---|
3695 | CONST_BITS+PASS1_BITS); |
---|
3696 | |
---|
3697 | dataptr++; /* advance pointer to next column */ |
---|
3698 | wsptr++; /* advance pointer to next column */ |
---|
3699 | } |
---|
3700 | } |
---|
3701 | |
---|
3702 | |
---|
3703 | /* |
---|
3704 | * Perform the forward DCT on a 6x12 sample block. |
---|
3705 | * |
---|
3706 | * 6-point FDCT in pass 1 (rows), 12-point in pass 2 (columns). |
---|
3707 | */ |
---|
3708 | |
---|
3709 | GLOBAL(void) |
---|
3710 | jpeg_fdct_6x12 (DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col) |
---|
3711 | { |
---|
3712 | INT32 tmp0, tmp1, tmp2, tmp3, tmp4, tmp5; |
---|
3713 | INT32 tmp10, tmp11, tmp12, tmp13, tmp14, tmp15; |
---|
3714 | DCTELEM workspace[8*4]; |
---|
3715 | DCTELEM *dataptr; |
---|
3716 | DCTELEM *wsptr; |
---|
3717 | JSAMPROW elemptr; |
---|
3718 | int ctr; |
---|
3719 | SHIFT_TEMPS |
---|
3720 | |
---|
3721 | /* Pre-zero output coefficient block. */ |
---|
3722 | MEMZERO(data, SIZEOF(DCTELEM) * DCTSIZE2); |
---|
3723 | |
---|
3724 | /* Pass 1: process rows. */ |
---|
3725 | /* Note results are scaled up by sqrt(8) compared to a true DCT; */ |
---|
3726 | /* furthermore, we scale the results by 2**PASS1_BITS. */ |
---|
3727 | /* 6-point FDCT kernel, cK represents sqrt(2) * cos(K*pi/12). */ |
---|
3728 | |
---|
3729 | dataptr = data; |
---|
3730 | ctr = 0; |
---|
3731 | for (;;) { |
---|
3732 | elemptr = sample_data[ctr] + start_col; |
---|
3733 | |
---|
3734 | /* Even part */ |
---|
3735 | |
---|
3736 | tmp0 = GETJSAMPLE(elemptr[0]) + GETJSAMPLE(elemptr[5]); |
---|
3737 | tmp11 = GETJSAMPLE(elemptr[1]) + GETJSAMPLE(elemptr[4]); |
---|
3738 | tmp2 = GETJSAMPLE(elemptr[2]) + GETJSAMPLE(elemptr[3]); |
---|
3739 | |
---|
3740 | tmp10 = tmp0 + tmp2; |
---|
3741 | tmp12 = tmp0 - tmp2; |
---|
3742 | |
---|
3743 | tmp0 = GETJSAMPLE(elemptr[0]) - GETJSAMPLE(elemptr[5]); |
---|
3744 | tmp1 = GETJSAMPLE(elemptr[1]) - GETJSAMPLE(elemptr[4]); |
---|
3745 | tmp2 = GETJSAMPLE(elemptr[2]) - GETJSAMPLE(elemptr[3]); |
---|
3746 | |
---|
3747 | /* Apply unsigned->signed conversion */ |
---|
3748 | dataptr[0] = (DCTELEM) |
---|
3749 | ((tmp10 + tmp11 - 6 * CENTERJSAMPLE) << PASS1_BITS); |
---|
3750 | dataptr[2] = (DCTELEM) |
---|
3751 | DESCALE(MULTIPLY(tmp12, FIX(1.224744871)), /* c2 */ |
---|
3752 | CONST_BITS-PASS1_BITS); |
---|
3753 | dataptr[4] = (DCTELEM) |
---|
3754 | DESCALE(MULTIPLY(tmp10 - tmp11 - tmp11, FIX(0.707106781)), /* c4 */ |
---|
3755 | CONST_BITS-PASS1_BITS); |
---|
3756 | |
---|
3757 | /* Odd part */ |
---|
3758 | |
---|
3759 | tmp10 = DESCALE(MULTIPLY(tmp0 + tmp2, FIX(0.366025404)), /* c5 */ |
---|
3760 | CONST_BITS-PASS1_BITS); |
---|
3761 | |
---|
3762 | dataptr[1] = (DCTELEM) (tmp10 + ((tmp0 + tmp1) << PASS1_BITS)); |
---|
3763 | dataptr[3] = (DCTELEM) ((tmp0 - tmp1 - tmp2) << PASS1_BITS); |
---|
3764 | dataptr[5] = (DCTELEM) (tmp10 + ((tmp2 - tmp1) << PASS1_BITS)); |
---|
3765 | |
---|
3766 | ctr++; |
---|
3767 | |
---|
3768 | if (ctr != DCTSIZE) { |
---|
3769 | if (ctr == 12) |
---|
3770 | break; /* Done. */ |
---|
3771 | dataptr += DCTSIZE; /* advance pointer to next row */ |
---|
3772 | } else |
---|
3773 | dataptr = workspace; /* switch pointer to extended workspace */ |
---|
3774 | } |
---|
3775 | |
---|
3776 | /* Pass 2: process columns. |
---|
3777 | * We remove the PASS1_BITS scaling, but leave the results scaled up |
---|
3778 | * by an overall factor of 8. |
---|
3779 | * We must also scale the output by (8/6)*(8/12) = 8/9, which we |
---|
3780 | * fold into the constant multipliers: |
---|
3781 | * 12-point FDCT kernel, cK represents sqrt(2) * cos(K*pi/24) * 8/9. |
---|
3782 | */ |
---|
3783 | |
---|
3784 | dataptr = data; |
---|
3785 | wsptr = workspace; |
---|
3786 | for (ctr = 0; ctr < 6; ctr++) { |
---|
3787 | /* Even part */ |
---|
3788 | |
---|
3789 | tmp0 = dataptr[DCTSIZE*0] + wsptr[DCTSIZE*3]; |
---|
3790 | tmp1 = dataptr[DCTSIZE*1] + wsptr[DCTSIZE*2]; |
---|
3791 | tmp2 = dataptr[DCTSIZE*2] + wsptr[DCTSIZE*1]; |
---|
3792 | tmp3 = dataptr[DCTSIZE*3] + wsptr[DCTSIZE*0]; |
---|
3793 | tmp4 = dataptr[DCTSIZE*4] + dataptr[DCTSIZE*7]; |
---|
3794 | tmp5 = dataptr[DCTSIZE*5] + dataptr[DCTSIZE*6]; |
---|
3795 | |
---|
3796 | tmp10 = tmp0 + tmp5; |
---|
3797 | tmp13 = tmp0 - tmp5; |
---|
3798 | tmp11 = tmp1 + tmp4; |
---|
3799 | tmp14 = tmp1 - tmp4; |
---|
3800 | tmp12 = tmp2 + tmp3; |
---|
3801 | tmp15 = tmp2 - tmp3; |
---|
3802 | |
---|
3803 | tmp0 = dataptr[DCTSIZE*0] - wsptr[DCTSIZE*3]; |
---|
3804 | tmp1 = dataptr[DCTSIZE*1] - wsptr[DCTSIZE*2]; |
---|
3805 | tmp2 = dataptr[DCTSIZE*2] - wsptr[DCTSIZE*1]; |
---|
3806 | tmp3 = dataptr[DCTSIZE*3] - wsptr[DCTSIZE*0]; |
---|
3807 | tmp4 = dataptr[DCTSIZE*4] - dataptr[DCTSIZE*7]; |
---|
3808 | tmp5 = dataptr[DCTSIZE*5] - dataptr[DCTSIZE*6]; |
---|
3809 | |
---|
3810 | dataptr[DCTSIZE*0] = (DCTELEM) |
---|
3811 | DESCALE(MULTIPLY(tmp10 + tmp11 + tmp12, FIX(0.888888889)), /* 8/9 */ |
---|
3812 | CONST_BITS+PASS1_BITS); |
---|
3813 | dataptr[DCTSIZE*6] = (DCTELEM) |
---|
3814 | DESCALE(MULTIPLY(tmp13 - tmp14 - tmp15, FIX(0.888888889)), /* 8/9 */ |
---|
3815 | CONST_BITS+PASS1_BITS); |
---|
3816 | dataptr[DCTSIZE*4] = (DCTELEM) |
---|
3817 | DESCALE(MULTIPLY(tmp10 - tmp12, FIX(1.088662108)), /* c4 */ |
---|
3818 | CONST_BITS+PASS1_BITS); |
---|
3819 | dataptr[DCTSIZE*2] = (DCTELEM) |
---|
3820 | DESCALE(MULTIPLY(tmp14 - tmp15, FIX(0.888888889)) + /* 8/9 */ |
---|
3821 | MULTIPLY(tmp13 + tmp15, FIX(1.214244803)), /* c2 */ |
---|
3822 | CONST_BITS+PASS1_BITS); |
---|
3823 | |
---|
3824 | /* Odd part */ |
---|
3825 | |
---|
3826 | tmp10 = MULTIPLY(tmp1 + tmp4, FIX(0.481063200)); /* c9 */ |
---|
3827 | tmp14 = tmp10 + MULTIPLY(tmp1, FIX(0.680326102)); /* c3-c9 */ |
---|
3828 | tmp15 = tmp10 - MULTIPLY(tmp4, FIX(1.642452502)); /* c3+c9 */ |
---|
3829 | tmp12 = MULTIPLY(tmp0 + tmp2, FIX(0.997307603)); /* c5 */ |
---|
3830 | tmp13 = MULTIPLY(tmp0 + tmp3, FIX(0.765261039)); /* c7 */ |
---|
3831 | tmp10 = tmp12 + tmp13 + tmp14 - MULTIPLY(tmp0, FIX(0.516244403)) /* c5+c7-c1 */ |
---|
3832 | + MULTIPLY(tmp5, FIX(0.164081699)); /* c11 */ |
---|
3833 | tmp11 = MULTIPLY(tmp2 + tmp3, - FIX(0.164081699)); /* -c11 */ |
---|
3834 | tmp12 += tmp11 - tmp15 - MULTIPLY(tmp2, FIX(2.079550144)) /* c1+c5-c11 */ |
---|
3835 | + MULTIPLY(tmp5, FIX(0.765261039)); /* c7 */ |
---|
3836 | tmp13 += tmp11 - tmp14 + MULTIPLY(tmp3, FIX(0.645144899)) /* c1+c11-c7 */ |
---|
3837 | - MULTIPLY(tmp5, FIX(0.997307603)); /* c5 */ |
---|
3838 | tmp11 = tmp15 + MULTIPLY(tmp0 - tmp3, FIX(1.161389302)) /* c3 */ |
---|
3839 | - MULTIPLY(tmp2 + tmp5, FIX(0.481063200)); /* c9 */ |
---|
3840 | |
---|
3841 | dataptr[DCTSIZE*1] = (DCTELEM) DESCALE(tmp10, CONST_BITS+PASS1_BITS); |
---|
3842 | dataptr[DCTSIZE*3] = (DCTELEM) DESCALE(tmp11, CONST_BITS+PASS1_BITS); |
---|
3843 | dataptr[DCTSIZE*5] = (DCTELEM) DESCALE(tmp12, CONST_BITS+PASS1_BITS); |
---|
3844 | dataptr[DCTSIZE*7] = (DCTELEM) DESCALE(tmp13, CONST_BITS+PASS1_BITS); |
---|
3845 | |
---|
3846 | dataptr++; /* advance pointer to next column */ |
---|
3847 | wsptr++; /* advance pointer to next column */ |
---|
3848 | } |
---|
3849 | } |
---|
3850 | |
---|
3851 | |
---|
3852 | /* |
---|
3853 | * Perform the forward DCT on a 5x10 sample block. |
---|
3854 | * |
---|
3855 | * 5-point FDCT in pass 1 (rows), 10-point in pass 2 (columns). |
---|
3856 | */ |
---|
3857 | |
---|
3858 | GLOBAL(void) |
---|
3859 | jpeg_fdct_5x10 (DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col) |
---|
3860 | { |
---|
3861 | INT32 tmp0, tmp1, tmp2, tmp3, tmp4; |
---|
3862 | INT32 tmp10, tmp11, tmp12, tmp13, tmp14; |
---|
3863 | DCTELEM workspace[8*2]; |
---|
3864 | DCTELEM *dataptr; |
---|
3865 | DCTELEM *wsptr; |
---|
3866 | JSAMPROW elemptr; |
---|
3867 | int ctr; |
---|
3868 | SHIFT_TEMPS |
---|
3869 | |
---|
3870 | /* Pre-zero output coefficient block. */ |
---|
3871 | MEMZERO(data, SIZEOF(DCTELEM) * DCTSIZE2); |
---|
3872 | |
---|
3873 | /* Pass 1: process rows. */ |
---|
3874 | /* Note results are scaled up by sqrt(8) compared to a true DCT; */ |
---|
3875 | /* furthermore, we scale the results by 2**PASS1_BITS. */ |
---|
3876 | /* 5-point FDCT kernel, cK represents sqrt(2) * cos(K*pi/10). */ |
---|
3877 | |
---|
3878 | dataptr = data; |
---|
3879 | ctr = 0; |
---|
3880 | for (;;) { |
---|
3881 | elemptr = sample_data[ctr] + start_col; |
---|
3882 | |
---|
3883 | /* Even part */ |
---|
3884 | |
---|
3885 | tmp0 = GETJSAMPLE(elemptr[0]) + GETJSAMPLE(elemptr[4]); |
---|
3886 | tmp1 = GETJSAMPLE(elemptr[1]) + GETJSAMPLE(elemptr[3]); |
---|
3887 | tmp2 = GETJSAMPLE(elemptr[2]); |
---|
3888 | |
---|
3889 | tmp10 = tmp0 + tmp1; |
---|
3890 | tmp11 = tmp0 - tmp1; |
---|
3891 | |
---|
3892 | tmp0 = GETJSAMPLE(elemptr[0]) - GETJSAMPLE(elemptr[4]); |
---|
3893 | tmp1 = GETJSAMPLE(elemptr[1]) - GETJSAMPLE(elemptr[3]); |
---|
3894 | |
---|
3895 | /* Apply unsigned->signed conversion */ |
---|
3896 | dataptr[0] = (DCTELEM) |
---|
3897 | ((tmp10 + tmp2 - 5 * CENTERJSAMPLE) << PASS1_BITS); |
---|
3898 | tmp11 = MULTIPLY(tmp11, FIX(0.790569415)); /* (c2+c4)/2 */ |
---|
3899 | tmp10 -= tmp2 << 2; |
---|
3900 | tmp10 = MULTIPLY(tmp10, FIX(0.353553391)); /* (c2-c4)/2 */ |
---|
3901 | dataptr[2] = (DCTELEM) DESCALE(tmp11 + tmp10, CONST_BITS-PASS1_BITS); |
---|
3902 | dataptr[4] = (DCTELEM) DESCALE(tmp11 - tmp10, CONST_BITS-PASS1_BITS); |
---|
3903 | |
---|
3904 | /* Odd part */ |
---|
3905 | |
---|
3906 | tmp10 = MULTIPLY(tmp0 + tmp1, FIX(0.831253876)); /* c3 */ |
---|
3907 | |
---|
3908 | dataptr[1] = (DCTELEM) |
---|
3909 | DESCALE(tmp10 + MULTIPLY(tmp0, FIX(0.513743148)), /* c1-c3 */ |
---|
3910 | CONST_BITS-PASS1_BITS); |
---|
3911 | dataptr[3] = (DCTELEM) |
---|
3912 | DESCALE(tmp10 - MULTIPLY(tmp1, FIX(2.176250899)), /* c1+c3 */ |
---|
3913 | CONST_BITS-PASS1_BITS); |
---|
3914 | |
---|
3915 | ctr++; |
---|
3916 | |
---|
3917 | if (ctr != DCTSIZE) { |
---|
3918 | if (ctr == 10) |
---|
3919 | break; /* Done. */ |
---|
3920 | dataptr += DCTSIZE; /* advance pointer to next row */ |
---|
3921 | } else |
---|
3922 | dataptr = workspace; /* switch pointer to extended workspace */ |
---|
3923 | } |
---|
3924 | |
---|
3925 | /* Pass 2: process columns. |
---|
3926 | * We remove the PASS1_BITS scaling, but leave the results scaled up |
---|
3927 | * by an overall factor of 8. |
---|
3928 | * We must also scale the output by (8/5)*(8/10) = 32/25, which we |
---|
3929 | * fold into the constant multipliers: |
---|
3930 | * 10-point FDCT kernel, cK represents sqrt(2) * cos(K*pi/20) * 32/25. |
---|
3931 | */ |
---|
3932 | |
---|
3933 | dataptr = data; |
---|
3934 | wsptr = workspace; |
---|
3935 | for (ctr = 0; ctr < 5; ctr++) { |
---|
3936 | /* Even part */ |
---|
3937 | |
---|
3938 | tmp0 = dataptr[DCTSIZE*0] + wsptr[DCTSIZE*1]; |
---|
3939 | tmp1 = dataptr[DCTSIZE*1] + wsptr[DCTSIZE*0]; |
---|
3940 | tmp12 = dataptr[DCTSIZE*2] + dataptr[DCTSIZE*7]; |
---|
3941 | tmp3 = dataptr[DCTSIZE*3] + dataptr[DCTSIZE*6]; |
---|
3942 | tmp4 = dataptr[DCTSIZE*4] + dataptr[DCTSIZE*5]; |
---|
3943 | |
---|
3944 | tmp10 = tmp0 + tmp4; |
---|
3945 | tmp13 = tmp0 - tmp4; |
---|
3946 | tmp11 = tmp1 + tmp3; |
---|
3947 | tmp14 = tmp1 - tmp3; |
---|
3948 | |
---|
3949 | tmp0 = dataptr[DCTSIZE*0] - wsptr[DCTSIZE*1]; |
---|
3950 | tmp1 = dataptr[DCTSIZE*1] - wsptr[DCTSIZE*0]; |
---|
3951 | tmp2 = dataptr[DCTSIZE*2] - dataptr[DCTSIZE*7]; |
---|
3952 | tmp3 = dataptr[DCTSIZE*3] - dataptr[DCTSIZE*6]; |
---|
3953 | tmp4 = dataptr[DCTSIZE*4] - dataptr[DCTSIZE*5]; |
---|
3954 | |
---|
3955 | dataptr[DCTSIZE*0] = (DCTELEM) |
---|
3956 | DESCALE(MULTIPLY(tmp10 + tmp11 + tmp12, FIX(1.28)), /* 32/25 */ |
---|
3957 | CONST_BITS+PASS1_BITS); |
---|
3958 | tmp12 += tmp12; |
---|
3959 | dataptr[DCTSIZE*4] = (DCTELEM) |
---|
3960 | DESCALE(MULTIPLY(tmp10 - tmp12, FIX(1.464477191)) - /* c4 */ |
---|
3961 | MULTIPLY(tmp11 - tmp12, FIX(0.559380511)), /* c8 */ |
---|
3962 | CONST_BITS+PASS1_BITS); |
---|
3963 | tmp10 = MULTIPLY(tmp13 + tmp14, FIX(1.064004961)); /* c6 */ |
---|
3964 | dataptr[DCTSIZE*2] = (DCTELEM) |
---|
3965 | DESCALE(tmp10 + MULTIPLY(tmp13, FIX(0.657591230)), /* c2-c6 */ |
---|
3966 | CONST_BITS+PASS1_BITS); |
---|
3967 | dataptr[DCTSIZE*6] = (DCTELEM) |
---|
3968 | DESCALE(tmp10 - MULTIPLY(tmp14, FIX(2.785601151)), /* c2+c6 */ |
---|
3969 | CONST_BITS+PASS1_BITS); |
---|
3970 | |
---|
3971 | /* Odd part */ |
---|
3972 | |
---|
3973 | tmp10 = tmp0 + tmp4; |
---|
3974 | tmp11 = tmp1 - tmp3; |
---|
3975 | dataptr[DCTSIZE*5] = (DCTELEM) |
---|
3976 | DESCALE(MULTIPLY(tmp10 - tmp11 - tmp2, FIX(1.28)), /* 32/25 */ |
---|
3977 | CONST_BITS+PASS1_BITS); |
---|
3978 | tmp2 = MULTIPLY(tmp2, FIX(1.28)); /* 32/25 */ |
---|
3979 | dataptr[DCTSIZE*1] = (DCTELEM) |
---|
3980 | DESCALE(MULTIPLY(tmp0, FIX(1.787906876)) + /* c1 */ |
---|
3981 | MULTIPLY(tmp1, FIX(1.612894094)) + tmp2 + /* c3 */ |
---|
3982 | MULTIPLY(tmp3, FIX(0.821810588)) + /* c7 */ |
---|
3983 | MULTIPLY(tmp4, FIX(0.283176630)), /* c9 */ |
---|
3984 | CONST_BITS+PASS1_BITS); |
---|
3985 | tmp12 = MULTIPLY(tmp0 - tmp4, FIX(1.217352341)) - /* (c3+c7)/2 */ |
---|
3986 | MULTIPLY(tmp1 + tmp3, FIX(0.752365123)); /* (c1-c9)/2 */ |
---|
3987 | tmp13 = MULTIPLY(tmp10 + tmp11, FIX(0.395541753)) + /* (c3-c7)/2 */ |
---|
3988 | MULTIPLY(tmp11, FIX(0.64)) - tmp2; /* 16/25 */ |
---|
3989 | dataptr[DCTSIZE*3] = (DCTELEM) DESCALE(tmp12 + tmp13, CONST_BITS+PASS1_BITS); |
---|
3990 | dataptr[DCTSIZE*7] = (DCTELEM) DESCALE(tmp12 - tmp13, CONST_BITS+PASS1_BITS); |
---|
3991 | |
---|
3992 | dataptr++; /* advance pointer to next column */ |
---|
3993 | wsptr++; /* advance pointer to next column */ |
---|
3994 | } |
---|
3995 | } |
---|
3996 | |
---|
3997 | |
---|
3998 | /* |
---|
3999 | * Perform the forward DCT on a 4x8 sample block. |
---|
4000 | * |
---|
4001 | * 4-point FDCT in pass 1 (rows), 8-point in pass 2 (columns). |
---|
4002 | */ |
---|
4003 | |
---|
4004 | GLOBAL(void) |
---|
4005 | jpeg_fdct_4x8 (DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col) |
---|
4006 | { |
---|
4007 | INT32 tmp0, tmp1, tmp2, tmp3; |
---|
4008 | INT32 tmp10, tmp11, tmp12, tmp13; |
---|
4009 | INT32 z1; |
---|
4010 | DCTELEM *dataptr; |
---|
4011 | JSAMPROW elemptr; |
---|
4012 | int ctr; |
---|
4013 | SHIFT_TEMPS |
---|
4014 | |
---|
4015 | /* Pre-zero output coefficient block. */ |
---|
4016 | MEMZERO(data, SIZEOF(DCTELEM) * DCTSIZE2); |
---|
4017 | |
---|
4018 | /* Pass 1: process rows. */ |
---|
4019 | /* Note results are scaled up by sqrt(8) compared to a true DCT; */ |
---|
4020 | /* furthermore, we scale the results by 2**PASS1_BITS. */ |
---|
4021 | /* We must also scale the output by 8/4 = 2, which we add here. */ |
---|
4022 | /* 4-point FDCT kernel, cK represents sqrt(2) * cos(K*pi/16). */ |
---|
4023 | |
---|
4024 | dataptr = data; |
---|
4025 | for (ctr = 0; ctr < DCTSIZE; ctr++) { |
---|
4026 | elemptr = sample_data[ctr] + start_col; |
---|
4027 | |
---|
4028 | /* Even part */ |
---|
4029 | |
---|
4030 | tmp0 = GETJSAMPLE(elemptr[0]) + GETJSAMPLE(elemptr[3]); |
---|
4031 | tmp1 = GETJSAMPLE(elemptr[1]) + GETJSAMPLE(elemptr[2]); |
---|
4032 | |
---|
4033 | tmp10 = GETJSAMPLE(elemptr[0]) - GETJSAMPLE(elemptr[3]); |
---|
4034 | tmp11 = GETJSAMPLE(elemptr[1]) - GETJSAMPLE(elemptr[2]); |
---|
4035 | |
---|
4036 | /* Apply unsigned->signed conversion */ |
---|
4037 | dataptr[0] = (DCTELEM) |
---|
4038 | ((tmp0 + tmp1 - 4 * CENTERJSAMPLE) << (PASS1_BITS+1)); |
---|
4039 | dataptr[2] = (DCTELEM) ((tmp0 - tmp1) << (PASS1_BITS+1)); |
---|
4040 | |
---|
4041 | /* Odd part */ |
---|
4042 | |
---|
4043 | tmp0 = MULTIPLY(tmp10 + tmp11, FIX_0_541196100); /* c6 */ |
---|
4044 | /* Add fudge factor here for final descale. */ |
---|
4045 | tmp0 += ONE << (CONST_BITS-PASS1_BITS-2); |
---|
4046 | |
---|
4047 | dataptr[1] = (DCTELEM) |
---|
4048 | RIGHT_SHIFT(tmp0 + MULTIPLY(tmp10, FIX_0_765366865), /* c2-c6 */ |
---|
4049 | CONST_BITS-PASS1_BITS-1); |
---|
4050 | dataptr[3] = (DCTELEM) |
---|
4051 | RIGHT_SHIFT(tmp0 - MULTIPLY(tmp11, FIX_1_847759065), /* c2+c6 */ |
---|
4052 | CONST_BITS-PASS1_BITS-1); |
---|
4053 | |
---|
4054 | dataptr += DCTSIZE; /* advance pointer to next row */ |
---|
4055 | } |
---|
4056 | |
---|
4057 | /* Pass 2: process columns. |
---|
4058 | * We remove the PASS1_BITS scaling, but leave the results scaled up |
---|
4059 | * by an overall factor of 8. |
---|
4060 | */ |
---|
4061 | |
---|
4062 | dataptr = data; |
---|
4063 | for (ctr = 0; ctr < 4; ctr++) { |
---|
4064 | /* Even part per LL&M figure 1 --- note that published figure is faulty; |
---|
4065 | * rotator "sqrt(2)*c1" should be "sqrt(2)*c6". |
---|
4066 | */ |
---|
4067 | |
---|
4068 | tmp0 = dataptr[DCTSIZE*0] + dataptr[DCTSIZE*7]; |
---|
4069 | tmp1 = dataptr[DCTSIZE*1] + dataptr[DCTSIZE*6]; |
---|
4070 | tmp2 = dataptr[DCTSIZE*2] + dataptr[DCTSIZE*5]; |
---|
4071 | tmp3 = dataptr[DCTSIZE*3] + dataptr[DCTSIZE*4]; |
---|
4072 | |
---|
4073 | /* Add fudge factor here for final descale. */ |
---|
4074 | tmp10 = tmp0 + tmp3 + (ONE << (PASS1_BITS-1)); |
---|
4075 | tmp12 = tmp0 - tmp3; |
---|
4076 | tmp11 = tmp1 + tmp2; |
---|
4077 | tmp13 = tmp1 - tmp2; |
---|
4078 | |
---|
4079 | tmp0 = dataptr[DCTSIZE*0] - dataptr[DCTSIZE*7]; |
---|
4080 | tmp1 = dataptr[DCTSIZE*1] - dataptr[DCTSIZE*6]; |
---|
4081 | tmp2 = dataptr[DCTSIZE*2] - dataptr[DCTSIZE*5]; |
---|
4082 | tmp3 = dataptr[DCTSIZE*3] - dataptr[DCTSIZE*4]; |
---|
4083 | |
---|
4084 | dataptr[DCTSIZE*0] = (DCTELEM) RIGHT_SHIFT(tmp10 + tmp11, PASS1_BITS); |
---|
4085 | dataptr[DCTSIZE*4] = (DCTELEM) RIGHT_SHIFT(tmp10 - tmp11, PASS1_BITS); |
---|
4086 | |
---|
4087 | z1 = MULTIPLY(tmp12 + tmp13, FIX_0_541196100); |
---|
4088 | /* Add fudge factor here for final descale. */ |
---|
4089 | z1 += ONE << (CONST_BITS+PASS1_BITS-1); |
---|
4090 | dataptr[DCTSIZE*2] = (DCTELEM) |
---|
4091 | RIGHT_SHIFT(z1 + MULTIPLY(tmp12, FIX_0_765366865), CONST_BITS+PASS1_BITS); |
---|
4092 | dataptr[DCTSIZE*6] = (DCTELEM) |
---|
4093 | RIGHT_SHIFT(z1 - MULTIPLY(tmp13, FIX_1_847759065), CONST_BITS+PASS1_BITS); |
---|
4094 | |
---|
4095 | /* Odd part per figure 8 --- note paper omits factor of sqrt(2). |
---|
4096 | * 8-point FDCT kernel, cK represents sqrt(2) * cos(K*pi/16). |
---|
4097 | * i0..i3 in the paper are tmp0..tmp3 here. |
---|
4098 | */ |
---|
4099 | |
---|
4100 | tmp10 = tmp0 + tmp3; |
---|
4101 | tmp11 = tmp1 + tmp2; |
---|
4102 | tmp12 = tmp0 + tmp2; |
---|
4103 | tmp13 = tmp1 + tmp3; |
---|
4104 | z1 = MULTIPLY(tmp12 + tmp13, FIX_1_175875602); /* c3 */ |
---|
4105 | /* Add fudge factor here for final descale. */ |
---|
4106 | z1 += ONE << (CONST_BITS+PASS1_BITS-1); |
---|
4107 | |
---|
4108 | tmp0 = MULTIPLY(tmp0, FIX_1_501321110); /* c1+c3-c5-c7 */ |
---|
4109 | tmp1 = MULTIPLY(tmp1, FIX_3_072711026); /* c1+c3+c5-c7 */ |
---|
4110 | tmp2 = MULTIPLY(tmp2, FIX_2_053119869); /* c1+c3-c5+c7 */ |
---|
4111 | tmp3 = MULTIPLY(tmp3, FIX_0_298631336); /* -c1+c3+c5-c7 */ |
---|
4112 | tmp10 = MULTIPLY(tmp10, - FIX_0_899976223); /* c7-c3 */ |
---|
4113 | tmp11 = MULTIPLY(tmp11, - FIX_2_562915447); /* -c1-c3 */ |
---|
4114 | tmp12 = MULTIPLY(tmp12, - FIX_0_390180644); /* c5-c3 */ |
---|
4115 | tmp13 = MULTIPLY(tmp13, - FIX_1_961570560); /* -c3-c5 */ |
---|
4116 | |
---|
4117 | tmp12 += z1; |
---|
4118 | tmp13 += z1; |
---|
4119 | |
---|
4120 | dataptr[DCTSIZE*1] = (DCTELEM) |
---|
4121 | RIGHT_SHIFT(tmp0 + tmp10 + tmp12, CONST_BITS+PASS1_BITS); |
---|
4122 | dataptr[DCTSIZE*3] = (DCTELEM) |
---|
4123 | RIGHT_SHIFT(tmp1 + tmp11 + tmp13, CONST_BITS+PASS1_BITS); |
---|
4124 | dataptr[DCTSIZE*5] = (DCTELEM) |
---|
4125 | RIGHT_SHIFT(tmp2 + tmp11 + tmp12, CONST_BITS+PASS1_BITS); |
---|
4126 | dataptr[DCTSIZE*7] = (DCTELEM) |
---|
4127 | RIGHT_SHIFT(tmp3 + tmp10 + tmp13, CONST_BITS+PASS1_BITS); |
---|
4128 | |
---|
4129 | dataptr++; /* advance pointer to next column */ |
---|
4130 | } |
---|
4131 | } |
---|
4132 | |
---|
4133 | |
---|
4134 | /* |
---|
4135 | * Perform the forward DCT on a 3x6 sample block. |
---|
4136 | * |
---|
4137 | * 3-point FDCT in pass 1 (rows), 6-point in pass 2 (columns). |
---|
4138 | */ |
---|
4139 | |
---|
4140 | GLOBAL(void) |
---|
4141 | jpeg_fdct_3x6 (DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col) |
---|
4142 | { |
---|
4143 | INT32 tmp0, tmp1, tmp2; |
---|
4144 | INT32 tmp10, tmp11, tmp12; |
---|
4145 | DCTELEM *dataptr; |
---|
4146 | JSAMPROW elemptr; |
---|
4147 | int ctr; |
---|
4148 | SHIFT_TEMPS |
---|
4149 | |
---|
4150 | /* Pre-zero output coefficient block. */ |
---|
4151 | MEMZERO(data, SIZEOF(DCTELEM) * DCTSIZE2); |
---|
4152 | |
---|
4153 | /* Pass 1: process rows. */ |
---|
4154 | /* Note results are scaled up by sqrt(8) compared to a true DCT; */ |
---|
4155 | /* furthermore, we scale the results by 2**PASS1_BITS. */ |
---|
4156 | /* We scale the results further by 2 as part of output adaption */ |
---|
4157 | /* scaling for different DCT size. */ |
---|
4158 | /* 3-point FDCT kernel, cK represents sqrt(2) * cos(K*pi/6). */ |
---|
4159 | |
---|
4160 | dataptr = data; |
---|
4161 | for (ctr = 0; ctr < 6; ctr++) { |
---|
4162 | elemptr = sample_data[ctr] + start_col; |
---|
4163 | |
---|
4164 | /* Even part */ |
---|
4165 | |
---|
4166 | tmp0 = GETJSAMPLE(elemptr[0]) + GETJSAMPLE(elemptr[2]); |
---|
4167 | tmp1 = GETJSAMPLE(elemptr[1]); |
---|
4168 | |
---|
4169 | tmp2 = GETJSAMPLE(elemptr[0]) - GETJSAMPLE(elemptr[2]); |
---|
4170 | |
---|
4171 | /* Apply unsigned->signed conversion */ |
---|
4172 | dataptr[0] = (DCTELEM) |
---|
4173 | ((tmp0 + tmp1 - 3 * CENTERJSAMPLE) << (PASS1_BITS+1)); |
---|
4174 | dataptr[2] = (DCTELEM) |
---|
4175 | DESCALE(MULTIPLY(tmp0 - tmp1 - tmp1, FIX(0.707106781)), /* c2 */ |
---|
4176 | CONST_BITS-PASS1_BITS-1); |
---|
4177 | |
---|
4178 | /* Odd part */ |
---|
4179 | |
---|
4180 | dataptr[1] = (DCTELEM) |
---|
4181 | DESCALE(MULTIPLY(tmp2, FIX(1.224744871)), /* c1 */ |
---|
4182 | CONST_BITS-PASS1_BITS-1); |
---|
4183 | |
---|
4184 | dataptr += DCTSIZE; /* advance pointer to next row */ |
---|
4185 | } |
---|
4186 | |
---|
4187 | /* Pass 2: process columns. |
---|
4188 | * We remove the PASS1_BITS scaling, but leave the results scaled up |
---|
4189 | * by an overall factor of 8. |
---|
4190 | * We must also scale the output by (8/6)*(8/3) = 32/9, which we partially |
---|
4191 | * fold into the constant multipliers (other part was done in pass 1): |
---|
4192 | * 6-point FDCT kernel, cK represents sqrt(2) * cos(K*pi/12) * 16/9. |
---|
4193 | */ |
---|
4194 | |
---|
4195 | dataptr = data; |
---|
4196 | for (ctr = 0; ctr < 3; ctr++) { |
---|
4197 | /* Even part */ |
---|
4198 | |
---|
4199 | tmp0 = dataptr[DCTSIZE*0] + dataptr[DCTSIZE*5]; |
---|
4200 | tmp11 = dataptr[DCTSIZE*1] + dataptr[DCTSIZE*4]; |
---|
4201 | tmp2 = dataptr[DCTSIZE*2] + dataptr[DCTSIZE*3]; |
---|
4202 | |
---|
4203 | tmp10 = tmp0 + tmp2; |
---|
4204 | tmp12 = tmp0 - tmp2; |
---|
4205 | |
---|
4206 | tmp0 = dataptr[DCTSIZE*0] - dataptr[DCTSIZE*5]; |
---|
4207 | tmp1 = dataptr[DCTSIZE*1] - dataptr[DCTSIZE*4]; |
---|
4208 | tmp2 = dataptr[DCTSIZE*2] - dataptr[DCTSIZE*3]; |
---|
4209 | |
---|
4210 | dataptr[DCTSIZE*0] = (DCTELEM) |
---|
4211 | DESCALE(MULTIPLY(tmp10 + tmp11, FIX(1.777777778)), /* 16/9 */ |
---|
4212 | CONST_BITS+PASS1_BITS); |
---|
4213 | dataptr[DCTSIZE*2] = (DCTELEM) |
---|
4214 | DESCALE(MULTIPLY(tmp12, FIX(2.177324216)), /* c2 */ |
---|
4215 | CONST_BITS+PASS1_BITS); |
---|
4216 | dataptr[DCTSIZE*4] = (DCTELEM) |
---|
4217 | DESCALE(MULTIPLY(tmp10 - tmp11 - tmp11, FIX(1.257078722)), /* c4 */ |
---|
4218 | CONST_BITS+PASS1_BITS); |
---|
4219 | |
---|
4220 | /* Odd part */ |
---|
4221 | |
---|
4222 | tmp10 = MULTIPLY(tmp0 + tmp2, FIX(0.650711829)); /* c5 */ |
---|
4223 | |
---|
4224 | dataptr[DCTSIZE*1] = (DCTELEM) |
---|
4225 | DESCALE(tmp10 + MULTIPLY(tmp0 + tmp1, FIX(1.777777778)), /* 16/9 */ |
---|
4226 | CONST_BITS+PASS1_BITS); |
---|
4227 | dataptr[DCTSIZE*3] = (DCTELEM) |
---|
4228 | DESCALE(MULTIPLY(tmp0 - tmp1 - tmp2, FIX(1.777777778)), /* 16/9 */ |
---|
4229 | CONST_BITS+PASS1_BITS); |
---|
4230 | dataptr[DCTSIZE*5] = (DCTELEM) |
---|
4231 | DESCALE(tmp10 + MULTIPLY(tmp2 - tmp1, FIX(1.777777778)), /* 16/9 */ |
---|
4232 | CONST_BITS+PASS1_BITS); |
---|
4233 | |
---|
4234 | dataptr++; /* advance pointer to next column */ |
---|
4235 | } |
---|
4236 | } |
---|
4237 | |
---|
4238 | |
---|
4239 | /* |
---|
4240 | * Perform the forward DCT on a 2x4 sample block. |
---|
4241 | * |
---|
4242 | * 2-point FDCT in pass 1 (rows), 4-point in pass 2 (columns). |
---|
4243 | */ |
---|
4244 | |
---|
4245 | GLOBAL(void) |
---|
4246 | jpeg_fdct_2x4 (DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col) |
---|
4247 | { |
---|
4248 | INT32 tmp0, tmp1; |
---|
4249 | INT32 tmp10, tmp11; |
---|
4250 | DCTELEM *dataptr; |
---|
4251 | JSAMPROW elemptr; |
---|
4252 | int ctr; |
---|
4253 | SHIFT_TEMPS |
---|
4254 | |
---|
4255 | /* Pre-zero output coefficient block. */ |
---|
4256 | MEMZERO(data, SIZEOF(DCTELEM) * DCTSIZE2); |
---|
4257 | |
---|
4258 | /* Pass 1: process rows. */ |
---|
4259 | /* Note results are scaled up by sqrt(8) compared to a true DCT. */ |
---|
4260 | /* We must also scale the output by (8/2)*(8/4) = 2**3, which we add here. */ |
---|
4261 | |
---|
4262 | dataptr = data; |
---|
4263 | for (ctr = 0; ctr < 4; ctr++) { |
---|
4264 | elemptr = sample_data[ctr] + start_col; |
---|
4265 | |
---|
4266 | /* Even part */ |
---|
4267 | |
---|
4268 | tmp0 = GETJSAMPLE(elemptr[0]); |
---|
4269 | tmp1 = GETJSAMPLE(elemptr[1]); |
---|
4270 | |
---|
4271 | /* Apply unsigned->signed conversion */ |
---|
4272 | dataptr[0] = (DCTELEM) ((tmp0 + tmp1 - 2 * CENTERJSAMPLE) << 3); |
---|
4273 | |
---|
4274 | /* Odd part */ |
---|
4275 | |
---|
4276 | dataptr[1] = (DCTELEM) ((tmp0 - tmp1) << 3); |
---|
4277 | |
---|
4278 | dataptr += DCTSIZE; /* advance pointer to next row */ |
---|
4279 | } |
---|
4280 | |
---|
4281 | /* Pass 2: process columns. |
---|
4282 | * We leave the results scaled up by an overall factor of 8. |
---|
4283 | * 4-point FDCT kernel, |
---|
4284 | * cK represents sqrt(2) * cos(K*pi/16) [refers to 8-point FDCT]. |
---|
4285 | */ |
---|
4286 | |
---|
4287 | dataptr = data; |
---|
4288 | for (ctr = 0; ctr < 2; ctr++) { |
---|
4289 | /* Even part */ |
---|
4290 | |
---|
4291 | tmp0 = dataptr[DCTSIZE*0] + dataptr[DCTSIZE*3]; |
---|
4292 | tmp1 = dataptr[DCTSIZE*1] + dataptr[DCTSIZE*2]; |
---|
4293 | |
---|
4294 | tmp10 = dataptr[DCTSIZE*0] - dataptr[DCTSIZE*3]; |
---|
4295 | tmp11 = dataptr[DCTSIZE*1] - dataptr[DCTSIZE*2]; |
---|
4296 | |
---|
4297 | dataptr[DCTSIZE*0] = (DCTELEM) (tmp0 + tmp1); |
---|
4298 | dataptr[DCTSIZE*2] = (DCTELEM) (tmp0 - tmp1); |
---|
4299 | |
---|
4300 | /* Odd part */ |
---|
4301 | |
---|
4302 | tmp0 = MULTIPLY(tmp10 + tmp11, FIX_0_541196100); /* c6 */ |
---|
4303 | /* Add fudge factor here for final descale. */ |
---|
4304 | tmp0 += ONE << (CONST_BITS-1); |
---|
4305 | |
---|
4306 | dataptr[DCTSIZE*1] = (DCTELEM) |
---|
4307 | RIGHT_SHIFT(tmp0 + MULTIPLY(tmp10, FIX_0_765366865), /* c2-c6 */ |
---|
4308 | CONST_BITS); |
---|
4309 | dataptr[DCTSIZE*3] = (DCTELEM) |
---|
4310 | RIGHT_SHIFT(tmp0 - MULTIPLY(tmp11, FIX_1_847759065), /* c2+c6 */ |
---|
4311 | CONST_BITS); |
---|
4312 | |
---|
4313 | dataptr++; /* advance pointer to next column */ |
---|
4314 | } |
---|
4315 | } |
---|
4316 | |
---|
4317 | |
---|
4318 | /* |
---|
4319 | * Perform the forward DCT on a 1x2 sample block. |
---|
4320 | * |
---|
4321 | * 1-point FDCT in pass 1 (rows), 2-point in pass 2 (columns). |
---|
4322 | */ |
---|
4323 | |
---|
4324 | GLOBAL(void) |
---|
4325 | jpeg_fdct_1x2 (DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col) |
---|
4326 | { |
---|
4327 | INT32 tmp0, tmp1; |
---|
4328 | |
---|
4329 | /* Pre-zero output coefficient block. */ |
---|
4330 | MEMZERO(data, SIZEOF(DCTELEM) * DCTSIZE2); |
---|
4331 | |
---|
4332 | tmp0 = GETJSAMPLE(sample_data[0][start_col]); |
---|
4333 | tmp1 = GETJSAMPLE(sample_data[1][start_col]); |
---|
4334 | |
---|
4335 | /* We leave the results scaled up by an overall factor of 8. |
---|
4336 | * We must also scale the output by (8/1)*(8/2) = 2**5. |
---|
4337 | */ |
---|
4338 | |
---|
4339 | /* Even part */ |
---|
4340 | /* Apply unsigned->signed conversion */ |
---|
4341 | data[DCTSIZE*0] = (DCTELEM) ((tmp0 + tmp1 - 2 * CENTERJSAMPLE) << 5); |
---|
4342 | |
---|
4343 | /* Odd part */ |
---|
4344 | data[DCTSIZE*1] = (DCTELEM) ((tmp0 - tmp1) << 5); |
---|
4345 | } |
---|
4346 | |
---|
4347 | #endif /* DCT_SCALING_SUPPORTED */ |
---|
4348 | #endif /* DCT_ISLOW_SUPPORTED */ |
---|