1 | /* |
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2 | * jcmaster.c |
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3 | * |
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4 | * Copyright (C) 1991-1997, Thomas G. Lane. |
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5 | * Modified 2003-2011 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 master control logic for the JPEG compressor. |
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10 | * These routines are concerned with parameter validation, initial setup, |
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11 | * and inter-pass control (determining the number of passes and the work |
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12 | * to be done in each pass). |
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13 | */ |
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14 | |
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15 | #define JPEG_INTERNALS |
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16 | #include "jinclude.h" |
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17 | #include "jpeglib.h" |
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18 | |
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19 | |
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20 | /* Private state */ |
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21 | |
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22 | typedef enum { |
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23 | main_pass, /* input data, also do first output step */ |
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24 | huff_opt_pass, /* Huffman code optimization pass */ |
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25 | output_pass /* data output pass */ |
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26 | } c_pass_type; |
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27 | |
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28 | typedef struct { |
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29 | struct jpeg_comp_master pub; /* public fields */ |
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30 | |
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31 | c_pass_type pass_type; /* the type of the current pass */ |
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32 | |
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33 | int pass_number; /* # of passes completed */ |
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34 | int total_passes; /* total # of passes needed */ |
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35 | |
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36 | int scan_number; /* current index in scan_info[] */ |
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37 | } my_comp_master; |
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38 | |
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39 | typedef my_comp_master * my_master_ptr; |
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40 | |
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41 | |
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42 | /* |
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43 | * Support routines that do various essential calculations. |
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44 | */ |
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45 | |
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46 | /* |
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47 | * Compute JPEG image dimensions and related values. |
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48 | * NOTE: this is exported for possible use by application. |
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49 | * Hence it mustn't do anything that can't be done twice. |
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50 | */ |
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51 | |
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52 | GLOBAL(void) |
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53 | jpeg_calc_jpeg_dimensions (j_compress_ptr cinfo) |
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54 | /* Do computations that are needed before master selection phase */ |
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55 | { |
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56 | #ifdef DCT_SCALING_SUPPORTED |
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57 | |
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58 | /* Sanity check on input image dimensions to prevent overflow in |
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59 | * following calculation. |
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60 | * We do check jpeg_width and jpeg_height in initial_setup below, |
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61 | * but image_width and image_height can come from arbitrary data, |
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62 | * and we need some space for multiplication by block_size. |
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63 | */ |
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64 | if (((long) cinfo->image_width >> 24) || ((long) cinfo->image_height >> 24)) |
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65 | ERREXIT1(cinfo, JERR_IMAGE_TOO_BIG, (unsigned int) JPEG_MAX_DIMENSION); |
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66 | |
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67 | /* Compute actual JPEG image dimensions and DCT scaling choices. */ |
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68 | if (cinfo->scale_num >= cinfo->scale_denom * cinfo->block_size) { |
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69 | /* Provide block_size/1 scaling */ |
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70 | cinfo->jpeg_width = cinfo->image_width * cinfo->block_size; |
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71 | cinfo->jpeg_height = cinfo->image_height * cinfo->block_size; |
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72 | cinfo->min_DCT_h_scaled_size = 1; |
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73 | cinfo->min_DCT_v_scaled_size = 1; |
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74 | } else if (cinfo->scale_num * 2 >= cinfo->scale_denom * cinfo->block_size) { |
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75 | /* Provide block_size/2 scaling */ |
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76 | cinfo->jpeg_width = (JDIMENSION) |
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77 | jdiv_round_up((long) cinfo->image_width * cinfo->block_size, 2L); |
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78 | cinfo->jpeg_height = (JDIMENSION) |
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79 | jdiv_round_up((long) cinfo->image_height * cinfo->block_size, 2L); |
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80 | cinfo->min_DCT_h_scaled_size = 2; |
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81 | cinfo->min_DCT_v_scaled_size = 2; |
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82 | } else if (cinfo->scale_num * 3 >= cinfo->scale_denom * cinfo->block_size) { |
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83 | /* Provide block_size/3 scaling */ |
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84 | cinfo->jpeg_width = (JDIMENSION) |
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85 | jdiv_round_up((long) cinfo->image_width * cinfo->block_size, 3L); |
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86 | cinfo->jpeg_height = (JDIMENSION) |
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87 | jdiv_round_up((long) cinfo->image_height * cinfo->block_size, 3L); |
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88 | cinfo->min_DCT_h_scaled_size = 3; |
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89 | cinfo->min_DCT_v_scaled_size = 3; |
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90 | } else if (cinfo->scale_num * 4 >= cinfo->scale_denom * cinfo->block_size) { |
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91 | /* Provide block_size/4 scaling */ |
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92 | cinfo->jpeg_width = (JDIMENSION) |
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93 | jdiv_round_up((long) cinfo->image_width * cinfo->block_size, 4L); |
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94 | cinfo->jpeg_height = (JDIMENSION) |
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95 | jdiv_round_up((long) cinfo->image_height * cinfo->block_size, 4L); |
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96 | cinfo->min_DCT_h_scaled_size = 4; |
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97 | cinfo->min_DCT_v_scaled_size = 4; |
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98 | } else if (cinfo->scale_num * 5 >= cinfo->scale_denom * cinfo->block_size) { |
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99 | /* Provide block_size/5 scaling */ |
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100 | cinfo->jpeg_width = (JDIMENSION) |
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101 | jdiv_round_up((long) cinfo->image_width * cinfo->block_size, 5L); |
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102 | cinfo->jpeg_height = (JDIMENSION) |
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103 | jdiv_round_up((long) cinfo->image_height * cinfo->block_size, 5L); |
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104 | cinfo->min_DCT_h_scaled_size = 5; |
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105 | cinfo->min_DCT_v_scaled_size = 5; |
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106 | } else if (cinfo->scale_num * 6 >= cinfo->scale_denom * cinfo->block_size) { |
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107 | /* Provide block_size/6 scaling */ |
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108 | cinfo->jpeg_width = (JDIMENSION) |
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109 | jdiv_round_up((long) cinfo->image_width * cinfo->block_size, 6L); |
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110 | cinfo->jpeg_height = (JDIMENSION) |
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111 | jdiv_round_up((long) cinfo->image_height * cinfo->block_size, 6L); |
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112 | cinfo->min_DCT_h_scaled_size = 6; |
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113 | cinfo->min_DCT_v_scaled_size = 6; |
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114 | } else if (cinfo->scale_num * 7 >= cinfo->scale_denom * cinfo->block_size) { |
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115 | /* Provide block_size/7 scaling */ |
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116 | cinfo->jpeg_width = (JDIMENSION) |
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117 | jdiv_round_up((long) cinfo->image_width * cinfo->block_size, 7L); |
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118 | cinfo->jpeg_height = (JDIMENSION) |
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119 | jdiv_round_up((long) cinfo->image_height * cinfo->block_size, 7L); |
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120 | cinfo->min_DCT_h_scaled_size = 7; |
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121 | cinfo->min_DCT_v_scaled_size = 7; |
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122 | } else if (cinfo->scale_num * 8 >= cinfo->scale_denom * cinfo->block_size) { |
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123 | /* Provide block_size/8 scaling */ |
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124 | cinfo->jpeg_width = (JDIMENSION) |
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125 | jdiv_round_up((long) cinfo->image_width * cinfo->block_size, 8L); |
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126 | cinfo->jpeg_height = (JDIMENSION) |
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127 | jdiv_round_up((long) cinfo->image_height * cinfo->block_size, 8L); |
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128 | cinfo->min_DCT_h_scaled_size = 8; |
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129 | cinfo->min_DCT_v_scaled_size = 8; |
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130 | } else if (cinfo->scale_num * 9 >= cinfo->scale_denom * cinfo->block_size) { |
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131 | /* Provide block_size/9 scaling */ |
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132 | cinfo->jpeg_width = (JDIMENSION) |
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133 | jdiv_round_up((long) cinfo->image_width * cinfo->block_size, 9L); |
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134 | cinfo->jpeg_height = (JDIMENSION) |
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135 | jdiv_round_up((long) cinfo->image_height * cinfo->block_size, 9L); |
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136 | cinfo->min_DCT_h_scaled_size = 9; |
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137 | cinfo->min_DCT_v_scaled_size = 9; |
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138 | } else if (cinfo->scale_num * 10 >= cinfo->scale_denom * cinfo->block_size) { |
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139 | /* Provide block_size/10 scaling */ |
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140 | cinfo->jpeg_width = (JDIMENSION) |
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141 | jdiv_round_up((long) cinfo->image_width * cinfo->block_size, 10L); |
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142 | cinfo->jpeg_height = (JDIMENSION) |
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143 | jdiv_round_up((long) cinfo->image_height * cinfo->block_size, 10L); |
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144 | cinfo->min_DCT_h_scaled_size = 10; |
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145 | cinfo->min_DCT_v_scaled_size = 10; |
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146 | } else if (cinfo->scale_num * 11 >= cinfo->scale_denom * cinfo->block_size) { |
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147 | /* Provide block_size/11 scaling */ |
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148 | cinfo->jpeg_width = (JDIMENSION) |
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149 | jdiv_round_up((long) cinfo->image_width * cinfo->block_size, 11L); |
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150 | cinfo->jpeg_height = (JDIMENSION) |
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151 | jdiv_round_up((long) cinfo->image_height * cinfo->block_size, 11L); |
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152 | cinfo->min_DCT_h_scaled_size = 11; |
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153 | cinfo->min_DCT_v_scaled_size = 11; |
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154 | } else if (cinfo->scale_num * 12 >= cinfo->scale_denom * cinfo->block_size) { |
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155 | /* Provide block_size/12 scaling */ |
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156 | cinfo->jpeg_width = (JDIMENSION) |
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157 | jdiv_round_up((long) cinfo->image_width * cinfo->block_size, 12L); |
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158 | cinfo->jpeg_height = (JDIMENSION) |
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159 | jdiv_round_up((long) cinfo->image_height * cinfo->block_size, 12L); |
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160 | cinfo->min_DCT_h_scaled_size = 12; |
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161 | cinfo->min_DCT_v_scaled_size = 12; |
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162 | } else if (cinfo->scale_num * 13 >= cinfo->scale_denom * cinfo->block_size) { |
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163 | /* Provide block_size/13 scaling */ |
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164 | cinfo->jpeg_width = (JDIMENSION) |
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165 | jdiv_round_up((long) cinfo->image_width * cinfo->block_size, 13L); |
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166 | cinfo->jpeg_height = (JDIMENSION) |
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167 | jdiv_round_up((long) cinfo->image_height * cinfo->block_size, 13L); |
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168 | cinfo->min_DCT_h_scaled_size = 13; |
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169 | cinfo->min_DCT_v_scaled_size = 13; |
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170 | } else if (cinfo->scale_num * 14 >= cinfo->scale_denom * cinfo->block_size) { |
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171 | /* Provide block_size/14 scaling */ |
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172 | cinfo->jpeg_width = (JDIMENSION) |
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173 | jdiv_round_up((long) cinfo->image_width * cinfo->block_size, 14L); |
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174 | cinfo->jpeg_height = (JDIMENSION) |
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175 | jdiv_round_up((long) cinfo->image_height * cinfo->block_size, 14L); |
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176 | cinfo->min_DCT_h_scaled_size = 14; |
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177 | cinfo->min_DCT_v_scaled_size = 14; |
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178 | } else if (cinfo->scale_num * 15 >= cinfo->scale_denom * cinfo->block_size) { |
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179 | /* Provide block_size/15 scaling */ |
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180 | cinfo->jpeg_width = (JDIMENSION) |
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181 | jdiv_round_up((long) cinfo->image_width * cinfo->block_size, 15L); |
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182 | cinfo->jpeg_height = (JDIMENSION) |
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183 | jdiv_round_up((long) cinfo->image_height * cinfo->block_size, 15L); |
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184 | cinfo->min_DCT_h_scaled_size = 15; |
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185 | cinfo->min_DCT_v_scaled_size = 15; |
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186 | } else { |
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187 | /* Provide block_size/16 scaling */ |
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188 | cinfo->jpeg_width = (JDIMENSION) |
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189 | jdiv_round_up((long) cinfo->image_width * cinfo->block_size, 16L); |
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190 | cinfo->jpeg_height = (JDIMENSION) |
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191 | jdiv_round_up((long) cinfo->image_height * cinfo->block_size, 16L); |
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192 | cinfo->min_DCT_h_scaled_size = 16; |
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193 | cinfo->min_DCT_v_scaled_size = 16; |
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194 | } |
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195 | |
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196 | #else /* !DCT_SCALING_SUPPORTED */ |
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197 | |
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198 | /* Hardwire it to "no scaling" */ |
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199 | cinfo->jpeg_width = cinfo->image_width; |
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200 | cinfo->jpeg_height = cinfo->image_height; |
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201 | cinfo->min_DCT_h_scaled_size = DCTSIZE; |
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202 | cinfo->min_DCT_v_scaled_size = DCTSIZE; |
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203 | |
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204 | #endif /* DCT_SCALING_SUPPORTED */ |
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205 | } |
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206 | |
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207 | |
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208 | LOCAL(void) |
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209 | jpeg_calc_trans_dimensions (j_compress_ptr cinfo) |
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210 | { |
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211 | if (cinfo->min_DCT_h_scaled_size != cinfo->min_DCT_v_scaled_size) |
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212 | ERREXIT2(cinfo, JERR_BAD_DCTSIZE, |
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213 | cinfo->min_DCT_h_scaled_size, cinfo->min_DCT_v_scaled_size); |
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214 | |
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215 | cinfo->block_size = cinfo->min_DCT_h_scaled_size; |
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216 | } |
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217 | |
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218 | |
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219 | LOCAL(void) |
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220 | initial_setup (j_compress_ptr cinfo, boolean transcode_only) |
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221 | /* Do computations that are needed before master selection phase */ |
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222 | { |
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223 | int ci, ssize; |
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224 | jpeg_component_info *compptr; |
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225 | long samplesperrow; |
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226 | JDIMENSION jd_samplesperrow; |
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227 | |
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228 | if (transcode_only) |
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229 | jpeg_calc_trans_dimensions(cinfo); |
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230 | else |
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231 | jpeg_calc_jpeg_dimensions(cinfo); |
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232 | |
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233 | /* Sanity check on block_size */ |
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234 | if (cinfo->block_size < 1 || cinfo->block_size > 16) |
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235 | ERREXIT2(cinfo, JERR_BAD_DCTSIZE, cinfo->block_size, cinfo->block_size); |
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236 | |
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237 | /* Derive natural_order from block_size */ |
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238 | switch (cinfo->block_size) { |
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239 | case 2: cinfo->natural_order = jpeg_natural_order2; break; |
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240 | case 3: cinfo->natural_order = jpeg_natural_order3; break; |
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241 | case 4: cinfo->natural_order = jpeg_natural_order4; break; |
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242 | case 5: cinfo->natural_order = jpeg_natural_order5; break; |
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243 | case 6: cinfo->natural_order = jpeg_natural_order6; break; |
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244 | case 7: cinfo->natural_order = jpeg_natural_order7; break; |
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245 | default: cinfo->natural_order = jpeg_natural_order; break; |
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246 | } |
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247 | |
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248 | /* Derive lim_Se from block_size */ |
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249 | cinfo->lim_Se = cinfo->block_size < DCTSIZE ? |
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250 | cinfo->block_size * cinfo->block_size - 1 : DCTSIZE2-1; |
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251 | |
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252 | /* Sanity check on image dimensions */ |
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253 | if (cinfo->jpeg_height <= 0 || cinfo->jpeg_width <= 0 || |
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254 | cinfo->num_components <= 0 || cinfo->input_components <= 0) |
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255 | ERREXIT(cinfo, JERR_EMPTY_IMAGE); |
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256 | |
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257 | /* Make sure image isn't bigger than I can handle */ |
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258 | if ((long) cinfo->jpeg_height > (long) JPEG_MAX_DIMENSION || |
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259 | (long) cinfo->jpeg_width > (long) JPEG_MAX_DIMENSION) |
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260 | ERREXIT1(cinfo, JERR_IMAGE_TOO_BIG, (unsigned int) JPEG_MAX_DIMENSION); |
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261 | |
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262 | /* Width of an input scanline must be representable as JDIMENSION. */ |
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263 | samplesperrow = (long) cinfo->image_width * (long) cinfo->input_components; |
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264 | jd_samplesperrow = (JDIMENSION) samplesperrow; |
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265 | if ((long) jd_samplesperrow != samplesperrow) |
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266 | ERREXIT(cinfo, JERR_WIDTH_OVERFLOW); |
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267 | |
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268 | /* For now, precision must match compiled-in value... */ |
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269 | if (cinfo->data_precision != BITS_IN_JSAMPLE) |
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270 | ERREXIT1(cinfo, JERR_BAD_PRECISION, cinfo->data_precision); |
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271 | |
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272 | /* Check that number of components won't exceed internal array sizes */ |
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273 | if (cinfo->num_components > MAX_COMPONENTS) |
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274 | ERREXIT2(cinfo, JERR_COMPONENT_COUNT, cinfo->num_components, |
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275 | MAX_COMPONENTS); |
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276 | |
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277 | /* Compute maximum sampling factors; check factor validity */ |
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278 | cinfo->max_h_samp_factor = 1; |
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279 | cinfo->max_v_samp_factor = 1; |
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280 | for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components; |
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281 | ci++, compptr++) { |
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282 | if (compptr->h_samp_factor<=0 || compptr->h_samp_factor>MAX_SAMP_FACTOR || |
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283 | compptr->v_samp_factor<=0 || compptr->v_samp_factor>MAX_SAMP_FACTOR) |
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284 | ERREXIT(cinfo, JERR_BAD_SAMPLING); |
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285 | cinfo->max_h_samp_factor = MAX(cinfo->max_h_samp_factor, |
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286 | compptr->h_samp_factor); |
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287 | cinfo->max_v_samp_factor = MAX(cinfo->max_v_samp_factor, |
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288 | compptr->v_samp_factor); |
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289 | } |
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290 | |
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291 | /* Compute dimensions of components */ |
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292 | for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components; |
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293 | ci++, compptr++) { |
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294 | /* Fill in the correct component_index value; don't rely on application */ |
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295 | compptr->component_index = ci; |
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296 | /* In selecting the actual DCT scaling for each component, we try to |
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297 | * scale down the chroma components via DCT scaling rather than downsampling. |
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298 | * This saves time if the downsampler gets to use 1:1 scaling. |
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299 | * Note this code adapts subsampling ratios which are powers of 2. |
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300 | */ |
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301 | ssize = 1; |
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302 | #ifdef DCT_SCALING_SUPPORTED |
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303 | while (cinfo->min_DCT_h_scaled_size * ssize <= |
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304 | (cinfo->do_fancy_downsampling ? DCTSIZE : DCTSIZE / 2) && |
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305 | (cinfo->max_h_samp_factor % (compptr->h_samp_factor * ssize * 2)) == 0) { |
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306 | ssize = ssize * 2; |
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307 | } |
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308 | #endif |
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309 | compptr->DCT_h_scaled_size = cinfo->min_DCT_h_scaled_size * ssize; |
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310 | ssize = 1; |
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311 | #ifdef DCT_SCALING_SUPPORTED |
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312 | while (cinfo->min_DCT_v_scaled_size * ssize <= |
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313 | (cinfo->do_fancy_downsampling ? DCTSIZE : DCTSIZE / 2) && |
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314 | (cinfo->max_v_samp_factor % (compptr->v_samp_factor * ssize * 2)) == 0) { |
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315 | ssize = ssize * 2; |
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316 | } |
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317 | #endif |
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318 | compptr->DCT_v_scaled_size = cinfo->min_DCT_v_scaled_size * ssize; |
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319 | |
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320 | /* We don't support DCT ratios larger than 2. */ |
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321 | if (compptr->DCT_h_scaled_size > compptr->DCT_v_scaled_size * 2) |
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322 | compptr->DCT_h_scaled_size = compptr->DCT_v_scaled_size * 2; |
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323 | else if (compptr->DCT_v_scaled_size > compptr->DCT_h_scaled_size * 2) |
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324 | compptr->DCT_v_scaled_size = compptr->DCT_h_scaled_size * 2; |
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325 | |
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326 | /* Size in DCT blocks */ |
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327 | compptr->width_in_blocks = (JDIMENSION) |
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328 | jdiv_round_up((long) cinfo->jpeg_width * (long) compptr->h_samp_factor, |
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329 | (long) (cinfo->max_h_samp_factor * cinfo->block_size)); |
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330 | compptr->height_in_blocks = (JDIMENSION) |
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331 | jdiv_round_up((long) cinfo->jpeg_height * (long) compptr->v_samp_factor, |
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332 | (long) (cinfo->max_v_samp_factor * cinfo->block_size)); |
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333 | /* Size in samples */ |
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334 | compptr->downsampled_width = (JDIMENSION) |
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335 | jdiv_round_up((long) cinfo->jpeg_width * |
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336 | (long) (compptr->h_samp_factor * compptr->DCT_h_scaled_size), |
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337 | (long) (cinfo->max_h_samp_factor * cinfo->block_size)); |
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338 | compptr->downsampled_height = (JDIMENSION) |
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339 | jdiv_round_up((long) cinfo->jpeg_height * |
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340 | (long) (compptr->v_samp_factor * compptr->DCT_v_scaled_size), |
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341 | (long) (cinfo->max_v_samp_factor * cinfo->block_size)); |
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342 | /* Mark component needed (this flag isn't actually used for compression) */ |
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343 | compptr->component_needed = TRUE; |
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344 | } |
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345 | |
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346 | /* Compute number of fully interleaved MCU rows (number of times that |
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347 | * main controller will call coefficient controller). |
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348 | */ |
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349 | cinfo->total_iMCU_rows = (JDIMENSION) |
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350 | jdiv_round_up((long) cinfo->jpeg_height, |
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351 | (long) (cinfo->max_v_samp_factor * cinfo->block_size)); |
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352 | } |
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353 | |
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354 | |
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355 | #ifdef C_MULTISCAN_FILES_SUPPORTED |
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356 | |
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357 | LOCAL(void) |
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358 | validate_script (j_compress_ptr cinfo) |
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359 | /* Verify that the scan script in cinfo->scan_info[] is valid; also |
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360 | * determine whether it uses progressive JPEG, and set cinfo->progressive_mode. |
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361 | */ |
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362 | { |
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363 | const jpeg_scan_info * scanptr; |
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364 | int scanno, ncomps, ci, coefi, thisi; |
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365 | int Ss, Se, Ah, Al; |
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366 | boolean component_sent[MAX_COMPONENTS]; |
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367 | #ifdef C_PROGRESSIVE_SUPPORTED |
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368 | int * last_bitpos_ptr; |
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369 | int last_bitpos[MAX_COMPONENTS][DCTSIZE2]; |
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370 | /* -1 until that coefficient has been seen; then last Al for it */ |
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371 | #endif |
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372 | |
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373 | if (cinfo->num_scans <= 0) |
---|
374 | ERREXIT1(cinfo, JERR_BAD_SCAN_SCRIPT, 0); |
---|
375 | |
---|
376 | /* For sequential JPEG, all scans must have Ss=0, Se=DCTSIZE2-1; |
---|
377 | * for progressive JPEG, no scan can have this. |
---|
378 | */ |
---|
379 | scanptr = cinfo->scan_info; |
---|
380 | if (scanptr->Ss != 0 || scanptr->Se != DCTSIZE2-1) { |
---|
381 | #ifdef C_PROGRESSIVE_SUPPORTED |
---|
382 | cinfo->progressive_mode = TRUE; |
---|
383 | last_bitpos_ptr = & last_bitpos[0][0]; |
---|
384 | for (ci = 0; ci < cinfo->num_components; ci++) |
---|
385 | for (coefi = 0; coefi < DCTSIZE2; coefi++) |
---|
386 | *last_bitpos_ptr++ = -1; |
---|
387 | #else |
---|
388 | ERREXIT(cinfo, JERR_NOT_COMPILED); |
---|
389 | #endif |
---|
390 | } else { |
---|
391 | cinfo->progressive_mode = FALSE; |
---|
392 | for (ci = 0; ci < cinfo->num_components; ci++) |
---|
393 | component_sent[ci] = FALSE; |
---|
394 | } |
---|
395 | |
---|
396 | for (scanno = 1; scanno <= cinfo->num_scans; scanptr++, scanno++) { |
---|
397 | /* Validate component indexes */ |
---|
398 | ncomps = scanptr->comps_in_scan; |
---|
399 | if (ncomps <= 0 || ncomps > MAX_COMPS_IN_SCAN) |
---|
400 | ERREXIT2(cinfo, JERR_COMPONENT_COUNT, ncomps, MAX_COMPS_IN_SCAN); |
---|
401 | for (ci = 0; ci < ncomps; ci++) { |
---|
402 | thisi = scanptr->component_index[ci]; |
---|
403 | if (thisi < 0 || thisi >= cinfo->num_components) |
---|
404 | ERREXIT1(cinfo, JERR_BAD_SCAN_SCRIPT, scanno); |
---|
405 | /* Components must appear in SOF order within each scan */ |
---|
406 | if (ci > 0 && thisi <= scanptr->component_index[ci-1]) |
---|
407 | ERREXIT1(cinfo, JERR_BAD_SCAN_SCRIPT, scanno); |
---|
408 | } |
---|
409 | /* Validate progression parameters */ |
---|
410 | Ss = scanptr->Ss; |
---|
411 | Se = scanptr->Se; |
---|
412 | Ah = scanptr->Ah; |
---|
413 | Al = scanptr->Al; |
---|
414 | if (cinfo->progressive_mode) { |
---|
415 | #ifdef C_PROGRESSIVE_SUPPORTED |
---|
416 | /* The JPEG spec simply gives the ranges 0..13 for Ah and Al, but that |
---|
417 | * seems wrong: the upper bound ought to depend on data precision. |
---|
418 | * Perhaps they really meant 0..N+1 for N-bit precision. |
---|
419 | * Here we allow 0..10 for 8-bit data; Al larger than 10 results in |
---|
420 | * out-of-range reconstructed DC values during the first DC scan, |
---|
421 | * which might cause problems for some decoders. |
---|
422 | */ |
---|
423 | #if BITS_IN_JSAMPLE == 8 |
---|
424 | #define MAX_AH_AL 10 |
---|
425 | #else |
---|
426 | #define MAX_AH_AL 13 |
---|
427 | #endif |
---|
428 | if (Ss < 0 || Ss >= DCTSIZE2 || Se < Ss || Se >= DCTSIZE2 || |
---|
429 | Ah < 0 || Ah > MAX_AH_AL || Al < 0 || Al > MAX_AH_AL) |
---|
430 | ERREXIT1(cinfo, JERR_BAD_PROG_SCRIPT, scanno); |
---|
431 | if (Ss == 0) { |
---|
432 | if (Se != 0) /* DC and AC together not OK */ |
---|
433 | ERREXIT1(cinfo, JERR_BAD_PROG_SCRIPT, scanno); |
---|
434 | } else { |
---|
435 | if (ncomps != 1) /* AC scans must be for only one component */ |
---|
436 | ERREXIT1(cinfo, JERR_BAD_PROG_SCRIPT, scanno); |
---|
437 | } |
---|
438 | for (ci = 0; ci < ncomps; ci++) { |
---|
439 | last_bitpos_ptr = & last_bitpos[scanptr->component_index[ci]][0]; |
---|
440 | if (Ss != 0 && last_bitpos_ptr[0] < 0) /* AC without prior DC scan */ |
---|
441 | ERREXIT1(cinfo, JERR_BAD_PROG_SCRIPT, scanno); |
---|
442 | for (coefi = Ss; coefi <= Se; coefi++) { |
---|
443 | if (last_bitpos_ptr[coefi] < 0) { |
---|
444 | /* first scan of this coefficient */ |
---|
445 | if (Ah != 0) |
---|
446 | ERREXIT1(cinfo, JERR_BAD_PROG_SCRIPT, scanno); |
---|
447 | } else { |
---|
448 | /* not first scan */ |
---|
449 | if (Ah != last_bitpos_ptr[coefi] || Al != Ah-1) |
---|
450 | ERREXIT1(cinfo, JERR_BAD_PROG_SCRIPT, scanno); |
---|
451 | } |
---|
452 | last_bitpos_ptr[coefi] = Al; |
---|
453 | } |
---|
454 | } |
---|
455 | #endif |
---|
456 | } else { |
---|
457 | /* For sequential JPEG, all progression parameters must be these: */ |
---|
458 | if (Ss != 0 || Se != DCTSIZE2-1 || Ah != 0 || Al != 0) |
---|
459 | ERREXIT1(cinfo, JERR_BAD_PROG_SCRIPT, scanno); |
---|
460 | /* Make sure components are not sent twice */ |
---|
461 | for (ci = 0; ci < ncomps; ci++) { |
---|
462 | thisi = scanptr->component_index[ci]; |
---|
463 | if (component_sent[thisi]) |
---|
464 | ERREXIT1(cinfo, JERR_BAD_SCAN_SCRIPT, scanno); |
---|
465 | component_sent[thisi] = TRUE; |
---|
466 | } |
---|
467 | } |
---|
468 | } |
---|
469 | |
---|
470 | /* Now verify that everything got sent. */ |
---|
471 | if (cinfo->progressive_mode) { |
---|
472 | #ifdef C_PROGRESSIVE_SUPPORTED |
---|
473 | /* For progressive mode, we only check that at least some DC data |
---|
474 | * got sent for each component; the spec does not require that all bits |
---|
475 | * of all coefficients be transmitted. Would it be wiser to enforce |
---|
476 | * transmission of all coefficient bits?? |
---|
477 | */ |
---|
478 | for (ci = 0; ci < cinfo->num_components; ci++) { |
---|
479 | if (last_bitpos[ci][0] < 0) |
---|
480 | ERREXIT(cinfo, JERR_MISSING_DATA); |
---|
481 | } |
---|
482 | #endif |
---|
483 | } else { |
---|
484 | for (ci = 0; ci < cinfo->num_components; ci++) { |
---|
485 | if (! component_sent[ci]) |
---|
486 | ERREXIT(cinfo, JERR_MISSING_DATA); |
---|
487 | } |
---|
488 | } |
---|
489 | } |
---|
490 | |
---|
491 | |
---|
492 | LOCAL(void) |
---|
493 | reduce_script (j_compress_ptr cinfo) |
---|
494 | /* Adapt scan script for use with reduced block size; |
---|
495 | * assume that script has been validated before. |
---|
496 | */ |
---|
497 | { |
---|
498 | jpeg_scan_info * scanptr; |
---|
499 | int idxout, idxin; |
---|
500 | |
---|
501 | /* Circumvent const declaration for this function */ |
---|
502 | scanptr = (jpeg_scan_info *) cinfo->scan_info; |
---|
503 | idxout = 0; |
---|
504 | |
---|
505 | for (idxin = 0; idxin < cinfo->num_scans; idxin++) { |
---|
506 | /* After skipping, idxout becomes smaller than idxin */ |
---|
507 | if (idxin != idxout) |
---|
508 | /* Copy rest of data; |
---|
509 | * note we stay in given chunk of allocated memory. |
---|
510 | */ |
---|
511 | scanptr[idxout] = scanptr[idxin]; |
---|
512 | if (scanptr[idxout].Ss > cinfo->lim_Se) |
---|
513 | /* Entire scan out of range - skip this entry */ |
---|
514 | continue; |
---|
515 | if (scanptr[idxout].Se > cinfo->lim_Se) |
---|
516 | /* Limit scan to end of block */ |
---|
517 | scanptr[idxout].Se = cinfo->lim_Se; |
---|
518 | idxout++; |
---|
519 | } |
---|
520 | |
---|
521 | cinfo->num_scans = idxout; |
---|
522 | } |
---|
523 | |
---|
524 | #endif /* C_MULTISCAN_FILES_SUPPORTED */ |
---|
525 | |
---|
526 | |
---|
527 | LOCAL(void) |
---|
528 | select_scan_parameters (j_compress_ptr cinfo) |
---|
529 | /* Set up the scan parameters for the current scan */ |
---|
530 | { |
---|
531 | int ci; |
---|
532 | |
---|
533 | #ifdef C_MULTISCAN_FILES_SUPPORTED |
---|
534 | if (cinfo->scan_info != NULL) { |
---|
535 | /* Prepare for current scan --- the script is already validated */ |
---|
536 | my_master_ptr master = (my_master_ptr) cinfo->master; |
---|
537 | const jpeg_scan_info * scanptr = cinfo->scan_info + master->scan_number; |
---|
538 | |
---|
539 | cinfo->comps_in_scan = scanptr->comps_in_scan; |
---|
540 | for (ci = 0; ci < scanptr->comps_in_scan; ci++) { |
---|
541 | cinfo->cur_comp_info[ci] = |
---|
542 | &cinfo->comp_info[scanptr->component_index[ci]]; |
---|
543 | } |
---|
544 | if (cinfo->progressive_mode) { |
---|
545 | cinfo->Ss = scanptr->Ss; |
---|
546 | cinfo->Se = scanptr->Se; |
---|
547 | cinfo->Ah = scanptr->Ah; |
---|
548 | cinfo->Al = scanptr->Al; |
---|
549 | return; |
---|
550 | } |
---|
551 | } |
---|
552 | else |
---|
553 | #endif |
---|
554 | { |
---|
555 | /* Prepare for single sequential-JPEG scan containing all components */ |
---|
556 | if (cinfo->num_components > MAX_COMPS_IN_SCAN) |
---|
557 | ERREXIT2(cinfo, JERR_COMPONENT_COUNT, cinfo->num_components, |
---|
558 | MAX_COMPS_IN_SCAN); |
---|
559 | cinfo->comps_in_scan = cinfo->num_components; |
---|
560 | for (ci = 0; ci < cinfo->num_components; ci++) { |
---|
561 | cinfo->cur_comp_info[ci] = &cinfo->comp_info[ci]; |
---|
562 | } |
---|
563 | } |
---|
564 | cinfo->Ss = 0; |
---|
565 | cinfo->Se = cinfo->block_size * cinfo->block_size - 1; |
---|
566 | cinfo->Ah = 0; |
---|
567 | cinfo->Al = 0; |
---|
568 | } |
---|
569 | |
---|
570 | |
---|
571 | LOCAL(void) |
---|
572 | per_scan_setup (j_compress_ptr cinfo) |
---|
573 | /* Do computations that are needed before processing a JPEG scan */ |
---|
574 | /* cinfo->comps_in_scan and cinfo->cur_comp_info[] are already set */ |
---|
575 | { |
---|
576 | int ci, mcublks, tmp; |
---|
577 | jpeg_component_info *compptr; |
---|
578 | |
---|
579 | if (cinfo->comps_in_scan == 1) { |
---|
580 | |
---|
581 | /* Noninterleaved (single-component) scan */ |
---|
582 | compptr = cinfo->cur_comp_info[0]; |
---|
583 | |
---|
584 | /* Overall image size in MCUs */ |
---|
585 | cinfo->MCUs_per_row = compptr->width_in_blocks; |
---|
586 | cinfo->MCU_rows_in_scan = compptr->height_in_blocks; |
---|
587 | |
---|
588 | /* For noninterleaved scan, always one block per MCU */ |
---|
589 | compptr->MCU_width = 1; |
---|
590 | compptr->MCU_height = 1; |
---|
591 | compptr->MCU_blocks = 1; |
---|
592 | compptr->MCU_sample_width = compptr->DCT_h_scaled_size; |
---|
593 | compptr->last_col_width = 1; |
---|
594 | /* For noninterleaved scans, it is convenient to define last_row_height |
---|
595 | * as the number of block rows present in the last iMCU row. |
---|
596 | */ |
---|
597 | tmp = (int) (compptr->height_in_blocks % compptr->v_samp_factor); |
---|
598 | if (tmp == 0) tmp = compptr->v_samp_factor; |
---|
599 | compptr->last_row_height = tmp; |
---|
600 | |
---|
601 | /* Prepare array describing MCU composition */ |
---|
602 | cinfo->blocks_in_MCU = 1; |
---|
603 | cinfo->MCU_membership[0] = 0; |
---|
604 | |
---|
605 | } else { |
---|
606 | |
---|
607 | /* Interleaved (multi-component) scan */ |
---|
608 | if (cinfo->comps_in_scan <= 0 || cinfo->comps_in_scan > MAX_COMPS_IN_SCAN) |
---|
609 | ERREXIT2(cinfo, JERR_COMPONENT_COUNT, cinfo->comps_in_scan, |
---|
610 | MAX_COMPS_IN_SCAN); |
---|
611 | |
---|
612 | /* Overall image size in MCUs */ |
---|
613 | cinfo->MCUs_per_row = (JDIMENSION) |
---|
614 | jdiv_round_up((long) cinfo->jpeg_width, |
---|
615 | (long) (cinfo->max_h_samp_factor * cinfo->block_size)); |
---|
616 | cinfo->MCU_rows_in_scan = (JDIMENSION) |
---|
617 | jdiv_round_up((long) cinfo->jpeg_height, |
---|
618 | (long) (cinfo->max_v_samp_factor * cinfo->block_size)); |
---|
619 | |
---|
620 | cinfo->blocks_in_MCU = 0; |
---|
621 | |
---|
622 | for (ci = 0; ci < cinfo->comps_in_scan; ci++) { |
---|
623 | compptr = cinfo->cur_comp_info[ci]; |
---|
624 | /* Sampling factors give # of blocks of component in each MCU */ |
---|
625 | compptr->MCU_width = compptr->h_samp_factor; |
---|
626 | compptr->MCU_height = compptr->v_samp_factor; |
---|
627 | compptr->MCU_blocks = compptr->MCU_width * compptr->MCU_height; |
---|
628 | compptr->MCU_sample_width = compptr->MCU_width * compptr->DCT_h_scaled_size; |
---|
629 | /* Figure number of non-dummy blocks in last MCU column & row */ |
---|
630 | tmp = (int) (compptr->width_in_blocks % compptr->MCU_width); |
---|
631 | if (tmp == 0) tmp = compptr->MCU_width; |
---|
632 | compptr->last_col_width = tmp; |
---|
633 | tmp = (int) (compptr->height_in_blocks % compptr->MCU_height); |
---|
634 | if (tmp == 0) tmp = compptr->MCU_height; |
---|
635 | compptr->last_row_height = tmp; |
---|
636 | /* Prepare array describing MCU composition */ |
---|
637 | mcublks = compptr->MCU_blocks; |
---|
638 | if (cinfo->blocks_in_MCU + mcublks > C_MAX_BLOCKS_IN_MCU) |
---|
639 | ERREXIT(cinfo, JERR_BAD_MCU_SIZE); |
---|
640 | while (mcublks-- > 0) { |
---|
641 | cinfo->MCU_membership[cinfo->blocks_in_MCU++] = ci; |
---|
642 | } |
---|
643 | } |
---|
644 | |
---|
645 | } |
---|
646 | |
---|
647 | /* Convert restart specified in rows to actual MCU count. */ |
---|
648 | /* Note that count must fit in 16 bits, so we provide limiting. */ |
---|
649 | if (cinfo->restart_in_rows > 0) { |
---|
650 | long nominal = (long) cinfo->restart_in_rows * (long) cinfo->MCUs_per_row; |
---|
651 | cinfo->restart_interval = (unsigned int) MIN(nominal, 65535L); |
---|
652 | } |
---|
653 | } |
---|
654 | |
---|
655 | |
---|
656 | /* |
---|
657 | * Per-pass setup. |
---|
658 | * This is called at the beginning of each pass. We determine which modules |
---|
659 | * will be active during this pass and give them appropriate start_pass calls. |
---|
660 | * We also set is_last_pass to indicate whether any more passes will be |
---|
661 | * required. |
---|
662 | */ |
---|
663 | |
---|
664 | METHODDEF(void) |
---|
665 | prepare_for_pass (j_compress_ptr cinfo) |
---|
666 | { |
---|
667 | my_master_ptr master = (my_master_ptr) cinfo->master; |
---|
668 | |
---|
669 | switch (master->pass_type) { |
---|
670 | case main_pass: |
---|
671 | /* Initial pass: will collect input data, and do either Huffman |
---|
672 | * optimization or data output for the first scan. |
---|
673 | */ |
---|
674 | select_scan_parameters(cinfo); |
---|
675 | per_scan_setup(cinfo); |
---|
676 | if (! cinfo->raw_data_in) { |
---|
677 | (*cinfo->cconvert->start_pass) (cinfo); |
---|
678 | (*cinfo->downsample->start_pass) (cinfo); |
---|
679 | (*cinfo->prep->start_pass) (cinfo, JBUF_PASS_THRU); |
---|
680 | } |
---|
681 | (*cinfo->fdct->start_pass) (cinfo); |
---|
682 | (*cinfo->entropy->start_pass) (cinfo, cinfo->optimize_coding); |
---|
683 | (*cinfo->coef->start_pass) (cinfo, |
---|
684 | (master->total_passes > 1 ? |
---|
685 | JBUF_SAVE_AND_PASS : JBUF_PASS_THRU)); |
---|
686 | (*cinfo->main->start_pass) (cinfo, JBUF_PASS_THRU); |
---|
687 | if (cinfo->optimize_coding) { |
---|
688 | /* No immediate data output; postpone writing frame/scan headers */ |
---|
689 | master->pub.call_pass_startup = FALSE; |
---|
690 | } else { |
---|
691 | /* Will write frame/scan headers at first jpeg_write_scanlines call */ |
---|
692 | master->pub.call_pass_startup = TRUE; |
---|
693 | } |
---|
694 | break; |
---|
695 | #ifdef ENTROPY_OPT_SUPPORTED |
---|
696 | case huff_opt_pass: |
---|
697 | /* Do Huffman optimization for a scan after the first one. */ |
---|
698 | select_scan_parameters(cinfo); |
---|
699 | per_scan_setup(cinfo); |
---|
700 | if (cinfo->Ss != 0 || cinfo->Ah == 0) { |
---|
701 | (*cinfo->entropy->start_pass) (cinfo, TRUE); |
---|
702 | (*cinfo->coef->start_pass) (cinfo, JBUF_CRANK_DEST); |
---|
703 | master->pub.call_pass_startup = FALSE; |
---|
704 | break; |
---|
705 | } |
---|
706 | /* Special case: Huffman DC refinement scans need no Huffman table |
---|
707 | * and therefore we can skip the optimization pass for them. |
---|
708 | */ |
---|
709 | master->pass_type = output_pass; |
---|
710 | master->pass_number++; |
---|
711 | /*FALLTHROUGH*/ |
---|
712 | #endif |
---|
713 | case output_pass: |
---|
714 | /* Do a data-output pass. */ |
---|
715 | /* We need not repeat per-scan setup if prior optimization pass did it. */ |
---|
716 | if (! cinfo->optimize_coding) { |
---|
717 | select_scan_parameters(cinfo); |
---|
718 | per_scan_setup(cinfo); |
---|
719 | } |
---|
720 | (*cinfo->entropy->start_pass) (cinfo, FALSE); |
---|
721 | (*cinfo->coef->start_pass) (cinfo, JBUF_CRANK_DEST); |
---|
722 | /* We emit frame/scan headers now */ |
---|
723 | if (master->scan_number == 0) |
---|
724 | (*cinfo->marker->write_frame_header) (cinfo); |
---|
725 | (*cinfo->marker->write_scan_header) (cinfo); |
---|
726 | master->pub.call_pass_startup = FALSE; |
---|
727 | break; |
---|
728 | default: |
---|
729 | ERREXIT(cinfo, JERR_NOT_COMPILED); |
---|
730 | } |
---|
731 | |
---|
732 | master->pub.is_last_pass = (master->pass_number == master->total_passes-1); |
---|
733 | |
---|
734 | /* Set up progress monitor's pass info if present */ |
---|
735 | if (cinfo->progress != NULL) { |
---|
736 | cinfo->progress->completed_passes = master->pass_number; |
---|
737 | cinfo->progress->total_passes = master->total_passes; |
---|
738 | } |
---|
739 | } |
---|
740 | |
---|
741 | |
---|
742 | /* |
---|
743 | * Special start-of-pass hook. |
---|
744 | * This is called by jpeg_write_scanlines if call_pass_startup is TRUE. |
---|
745 | * In single-pass processing, we need this hook because we don't want to |
---|
746 | * write frame/scan headers during jpeg_start_compress; we want to let the |
---|
747 | * application write COM markers etc. between jpeg_start_compress and the |
---|
748 | * jpeg_write_scanlines loop. |
---|
749 | * In multi-pass processing, this routine is not used. |
---|
750 | */ |
---|
751 | |
---|
752 | METHODDEF(void) |
---|
753 | pass_startup (j_compress_ptr cinfo) |
---|
754 | { |
---|
755 | cinfo->master->call_pass_startup = FALSE; /* reset flag so call only once */ |
---|
756 | |
---|
757 | (*cinfo->marker->write_frame_header) (cinfo); |
---|
758 | (*cinfo->marker->write_scan_header) (cinfo); |
---|
759 | } |
---|
760 | |
---|
761 | |
---|
762 | /* |
---|
763 | * Finish up at end of pass. |
---|
764 | */ |
---|
765 | |
---|
766 | METHODDEF(void) |
---|
767 | finish_pass_master (j_compress_ptr cinfo) |
---|
768 | { |
---|
769 | my_master_ptr master = (my_master_ptr) cinfo->master; |
---|
770 | |
---|
771 | /* The entropy coder always needs an end-of-pass call, |
---|
772 | * either to analyze statistics or to flush its output buffer. |
---|
773 | */ |
---|
774 | (*cinfo->entropy->finish_pass) (cinfo); |
---|
775 | |
---|
776 | /* Update state for next pass */ |
---|
777 | switch (master->pass_type) { |
---|
778 | case main_pass: |
---|
779 | /* next pass is either output of scan 0 (after optimization) |
---|
780 | * or output of scan 1 (if no optimization). |
---|
781 | */ |
---|
782 | master->pass_type = output_pass; |
---|
783 | if (! cinfo->optimize_coding) |
---|
784 | master->scan_number++; |
---|
785 | break; |
---|
786 | case huff_opt_pass: |
---|
787 | /* next pass is always output of current scan */ |
---|
788 | master->pass_type = output_pass; |
---|
789 | break; |
---|
790 | case output_pass: |
---|
791 | /* next pass is either optimization or output of next scan */ |
---|
792 | if (cinfo->optimize_coding) |
---|
793 | master->pass_type = huff_opt_pass; |
---|
794 | master->scan_number++; |
---|
795 | break; |
---|
796 | } |
---|
797 | |
---|
798 | master->pass_number++; |
---|
799 | } |
---|
800 | |
---|
801 | |
---|
802 | /* |
---|
803 | * Initialize master compression control. |
---|
804 | */ |
---|
805 | |
---|
806 | GLOBAL(void) |
---|
807 | jinit_c_master_control (j_compress_ptr cinfo, boolean transcode_only) |
---|
808 | { |
---|
809 | my_master_ptr master; |
---|
810 | |
---|
811 | master = (my_master_ptr) |
---|
812 | (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE, |
---|
813 | SIZEOF(my_comp_master)); |
---|
814 | cinfo->master = (struct jpeg_comp_master *) master; |
---|
815 | master->pub.prepare_for_pass = prepare_for_pass; |
---|
816 | master->pub.pass_startup = pass_startup; |
---|
817 | master->pub.finish_pass = finish_pass_master; |
---|
818 | master->pub.is_last_pass = FALSE; |
---|
819 | |
---|
820 | /* Validate parameters, determine derived values */ |
---|
821 | initial_setup(cinfo, transcode_only); |
---|
822 | |
---|
823 | if (cinfo->scan_info != NULL) { |
---|
824 | #ifdef C_MULTISCAN_FILES_SUPPORTED |
---|
825 | validate_script(cinfo); |
---|
826 | if (cinfo->block_size < DCTSIZE) |
---|
827 | reduce_script(cinfo); |
---|
828 | #else |
---|
829 | ERREXIT(cinfo, JERR_NOT_COMPILED); |
---|
830 | #endif |
---|
831 | } else { |
---|
832 | cinfo->progressive_mode = FALSE; |
---|
833 | cinfo->num_scans = 1; |
---|
834 | } |
---|
835 | |
---|
836 | if ((cinfo->progressive_mode || cinfo->block_size < DCTSIZE) && |
---|
837 | !cinfo->arith_code) /* TEMPORARY HACK ??? */ |
---|
838 | /* assume default tables no good for progressive or downscale mode */ |
---|
839 | cinfo->optimize_coding = TRUE; |
---|
840 | |
---|
841 | /* Initialize my private state */ |
---|
842 | if (transcode_only) { |
---|
843 | /* no main pass in transcoding */ |
---|
844 | if (cinfo->optimize_coding) |
---|
845 | master->pass_type = huff_opt_pass; |
---|
846 | else |
---|
847 | master->pass_type = output_pass; |
---|
848 | } else { |
---|
849 | /* for normal compression, first pass is always this type: */ |
---|
850 | master->pass_type = main_pass; |
---|
851 | } |
---|
852 | master->scan_number = 0; |
---|
853 | master->pass_number = 0; |
---|
854 | if (cinfo->optimize_coding) |
---|
855 | master->total_passes = cinfo->num_scans * 2; |
---|
856 | else |
---|
857 | master->total_passes = cinfo->num_scans; |
---|
858 | } |
---|