1 |
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2 | /* pngtrans.c - transforms the data in a row (used by both readers and writers)
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3 | *
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4 | * Last changed in libpng 1.2.13 November 13, 2006
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5 | * For conditions of distribution and use, see copyright notice in png.h
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6 | * Copyright (c) 1998-2006 Glenn Randers-Pehrson
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7 | * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
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8 | * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
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9 | */
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10 |
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11 | #define PNG_INTERNAL
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12 | #include "png.h"
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13 |
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14 | #if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED)
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15 | #if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED)
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16 | /* turn on BGR-to-RGB mapping */
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17 | void PNGAPI
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18 | png_set_bgr(png_structp png_ptr)
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19 | {
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20 | png_debug(1, "in png_set_bgr\n");
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21 | if(png_ptr == NULL) return;
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22 | png_ptr->transformations |= PNG_BGR;
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23 | }
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24 | #endif
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25 |
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26 | #if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED)
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27 | /* turn on 16 bit byte swapping */
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28 | void PNGAPI
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29 | png_set_swap(png_structp png_ptr)
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30 | {
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31 | png_debug(1, "in png_set_swap\n");
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32 | if(png_ptr == NULL) return;
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33 | if (png_ptr->bit_depth == 16)
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34 | png_ptr->transformations |= PNG_SWAP_BYTES;
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35 | }
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36 | #endif
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37 |
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38 | #if defined(PNG_READ_PACK_SUPPORTED) || defined(PNG_WRITE_PACK_SUPPORTED)
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39 | /* turn on pixel packing */
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40 | void PNGAPI
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41 | png_set_packing(png_structp png_ptr)
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42 | {
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43 | png_debug(1, "in png_set_packing\n");
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44 | if(png_ptr == NULL) return;
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45 | if (png_ptr->bit_depth < 8)
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46 | {
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47 | png_ptr->transformations |= PNG_PACK;
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48 | png_ptr->usr_bit_depth = 8;
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49 | }
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50 | }
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51 | #endif
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52 |
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53 | #if defined(PNG_READ_PACKSWAP_SUPPORTED)||defined(PNG_WRITE_PACKSWAP_SUPPORTED)
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54 | /* turn on packed pixel swapping */
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55 | void PNGAPI
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56 | png_set_packswap(png_structp png_ptr)
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57 | {
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58 | png_debug(1, "in png_set_packswap\n");
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59 | if(png_ptr == NULL) return;
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60 | if (png_ptr->bit_depth < 8)
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61 | png_ptr->transformations |= PNG_PACKSWAP;
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62 | }
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63 | #endif
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64 |
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65 | #if defined(PNG_READ_SHIFT_SUPPORTED) || defined(PNG_WRITE_SHIFT_SUPPORTED)
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66 | void PNGAPI
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67 | png_set_shift(png_structp png_ptr, png_color_8p true_bits)
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68 | {
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69 | png_debug(1, "in png_set_shift\n");
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70 | if(png_ptr == NULL) return;
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71 | png_ptr->transformations |= PNG_SHIFT;
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72 | png_ptr->shift = *true_bits;
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73 | }
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74 | #endif
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75 |
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76 | #if defined(PNG_READ_INTERLACING_SUPPORTED) || \
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77 | defined(PNG_WRITE_INTERLACING_SUPPORTED)
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78 | int PNGAPI
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79 | png_set_interlace_handling(png_structp png_ptr)
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80 | {
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81 | png_debug(1, "in png_set_interlace handling\n");
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82 | if (png_ptr && png_ptr->interlaced)
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83 | {
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84 | png_ptr->transformations |= PNG_INTERLACE;
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85 | return (7);
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86 | }
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87 |
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88 | return (1);
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89 | }
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90 | #endif
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91 |
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92 | #if defined(PNG_READ_FILLER_SUPPORTED) || defined(PNG_WRITE_FILLER_SUPPORTED)
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93 | /* Add a filler byte on read, or remove a filler or alpha byte on write.
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94 | * The filler type has changed in v0.95 to allow future 2-byte fillers
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95 | * for 48-bit input data, as well as to avoid problems with some compilers
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96 | * that don't like bytes as parameters.
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97 | */
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98 | void PNGAPI
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99 | png_set_filler(png_structp png_ptr, png_uint_32 filler, int filler_loc)
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100 | {
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101 | png_debug(1, "in png_set_filler\n");
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102 | if(png_ptr == NULL) return;
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103 | png_ptr->transformations |= PNG_FILLER;
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104 | png_ptr->filler = (png_byte)filler;
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105 | if (filler_loc == PNG_FILLER_AFTER)
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106 | png_ptr->flags |= PNG_FLAG_FILLER_AFTER;
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107 | else
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108 | png_ptr->flags &= ~PNG_FLAG_FILLER_AFTER;
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109 |
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110 | /* This should probably go in the "do_read_filler" routine.
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111 | * I attempted to do that in libpng-1.0.1a but that caused problems
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112 | * so I restored it in libpng-1.0.2a
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113 | */
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114 |
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115 | if (png_ptr->color_type == PNG_COLOR_TYPE_RGB)
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116 | {
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117 | png_ptr->usr_channels = 4;
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118 | }
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119 |
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120 | /* Also I added this in libpng-1.0.2a (what happens when we expand
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121 | * a less-than-8-bit grayscale to GA? */
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122 |
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123 | if (png_ptr->color_type == PNG_COLOR_TYPE_GRAY && png_ptr->bit_depth >= 8)
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124 | {
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125 | png_ptr->usr_channels = 2;
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126 | }
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127 | }
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128 |
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129 | #if !defined(PNG_1_0_X)
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130 | /* Added to libpng-1.2.7 */
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131 | void PNGAPI
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132 | png_set_add_alpha(png_structp png_ptr, png_uint_32 filler, int filler_loc)
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133 | {
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134 | png_debug(1, "in png_set_add_alpha\n");
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135 | if(png_ptr == NULL) return;
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136 | png_set_filler(png_ptr, filler, filler_loc);
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137 | png_ptr->transformations |= PNG_ADD_ALPHA;
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138 | }
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139 | #endif
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140 |
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141 | #endif
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142 |
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143 | #if defined(PNG_READ_SWAP_ALPHA_SUPPORTED) || \
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144 | defined(PNG_WRITE_SWAP_ALPHA_SUPPORTED)
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145 | void PNGAPI
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146 | png_set_swap_alpha(png_structp png_ptr)
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147 | {
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148 | png_debug(1, "in png_set_swap_alpha\n");
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149 | if(png_ptr == NULL) return;
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150 | png_ptr->transformations |= PNG_SWAP_ALPHA;
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151 | }
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152 | #endif
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153 |
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154 | #if defined(PNG_READ_INVERT_ALPHA_SUPPORTED) || \
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155 | defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED)
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156 | void PNGAPI
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157 | png_set_invert_alpha(png_structp png_ptr)
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158 | {
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159 | png_debug(1, "in png_set_invert_alpha\n");
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160 | if(png_ptr == NULL) return;
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161 | png_ptr->transformations |= PNG_INVERT_ALPHA;
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162 | }
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163 | #endif
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164 |
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165 | #if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED)
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166 | void PNGAPI
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167 | png_set_invert_mono(png_structp png_ptr)
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168 | {
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169 | png_debug(1, "in png_set_invert_mono\n");
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170 | if(png_ptr == NULL) return;
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171 | png_ptr->transformations |= PNG_INVERT_MONO;
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172 | }
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173 |
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174 | /* invert monochrome grayscale data */
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175 | void /* PRIVATE */
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176 | png_do_invert(png_row_infop row_info, png_bytep row)
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177 | {
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178 | png_debug(1, "in png_do_invert\n");
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179 | /* This test removed from libpng version 1.0.13 and 1.2.0:
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180 | * if (row_info->bit_depth == 1 &&
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181 | */
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182 | #if defined(PNG_USELESS_TESTS_SUPPORTED)
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183 | if (row == NULL || row_info == NULL)
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184 | return;
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185 | #endif
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186 | if (row_info->color_type == PNG_COLOR_TYPE_GRAY)
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187 | {
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188 | png_bytep rp = row;
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189 | png_uint_32 i;
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190 | png_uint_32 istop = row_info->rowbytes;
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191 |
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192 | for (i = 0; i < istop; i++)
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193 | {
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194 | *rp = (png_byte)(~(*rp));
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195 | rp++;
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196 | }
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197 | }
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198 | else if (row_info->color_type == PNG_COLOR_TYPE_GRAY_ALPHA &&
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199 | row_info->bit_depth == 8)
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200 | {
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201 | png_bytep rp = row;
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202 | png_uint_32 i;
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203 | png_uint_32 istop = row_info->rowbytes;
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204 |
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205 | for (i = 0; i < istop; i+=2)
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206 | {
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207 | *rp = (png_byte)(~(*rp));
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208 | rp+=2;
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209 | }
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210 | }
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211 | else if (row_info->color_type == PNG_COLOR_TYPE_GRAY_ALPHA &&
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212 | row_info->bit_depth == 16)
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213 | {
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214 | png_bytep rp = row;
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215 | png_uint_32 i;
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216 | png_uint_32 istop = row_info->rowbytes;
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217 |
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218 | for (i = 0; i < istop; i+=4)
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219 | {
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220 | *rp = (png_byte)(~(*rp));
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221 | *(rp+1) = (png_byte)(~(*(rp+1)));
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222 | rp+=4;
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223 | }
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224 | }
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225 | }
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226 | #endif
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227 |
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228 | #if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED)
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229 | /* swaps byte order on 16 bit depth images */
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230 | void /* PRIVATE */
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231 | png_do_swap(png_row_infop row_info, png_bytep row)
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232 | {
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233 | png_debug(1, "in png_do_swap\n");
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234 | if (
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235 | #if defined(PNG_USELESS_TESTS_SUPPORTED)
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236 | row != NULL && row_info != NULL &&
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237 | #endif
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238 | row_info->bit_depth == 16)
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239 | {
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240 | png_bytep rp = row;
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241 | png_uint_32 i;
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242 | png_uint_32 istop= row_info->width * row_info->channels;
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243 |
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244 | for (i = 0; i < istop; i++, rp += 2)
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245 | {
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246 | png_byte t = *rp;
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247 | *rp = *(rp + 1);
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248 | *(rp + 1) = t;
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249 | }
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250 | }
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251 | }
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252 | #endif
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253 |
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254 | #if defined(PNG_READ_PACKSWAP_SUPPORTED)||defined(PNG_WRITE_PACKSWAP_SUPPORTED)
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255 | // BT: removed PNG_CONST, since const was already present
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256 | const static png_byte onebppswaptable[256] = {
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257 | 0x00, 0x80, 0x40, 0xC0, 0x20, 0xA0, 0x60, 0xE0,
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258 | 0x10, 0x90, 0x50, 0xD0, 0x30, 0xB0, 0x70, 0xF0,
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259 | 0x08, 0x88, 0x48, 0xC8, 0x28, 0xA8, 0x68, 0xE8,
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260 | 0x18, 0x98, 0x58, 0xD8, 0x38, 0xB8, 0x78, 0xF8,
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261 | 0x04, 0x84, 0x44, 0xC4, 0x24, 0xA4, 0x64, 0xE4,
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262 | 0x14, 0x94, 0x54, 0xD4, 0x34, 0xB4, 0x74, 0xF4,
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263 | 0x0C, 0x8C, 0x4C, 0xCC, 0x2C, 0xAC, 0x6C, 0xEC,
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264 | 0x1C, 0x9C, 0x5C, 0xDC, 0x3C, 0xBC, 0x7C, 0xFC,
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265 | 0x02, 0x82, 0x42, 0xC2, 0x22, 0xA2, 0x62, 0xE2,
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266 | 0x12, 0x92, 0x52, 0xD2, 0x32, 0xB2, 0x72, 0xF2,
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267 | 0x0A, 0x8A, 0x4A, 0xCA, 0x2A, 0xAA, 0x6A, 0xEA,
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268 | 0x1A, 0x9A, 0x5A, 0xDA, 0x3A, 0xBA, 0x7A, 0xFA,
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269 | 0x06, 0x86, 0x46, 0xC6, 0x26, 0xA6, 0x66, 0xE6,
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270 | 0x16, 0x96, 0x56, 0xD6, 0x36, 0xB6, 0x76, 0xF6,
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271 | 0x0E, 0x8E, 0x4E, 0xCE, 0x2E, 0xAE, 0x6E, 0xEE,
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272 | 0x1E, 0x9E, 0x5E, 0xDE, 0x3E, 0xBE, 0x7E, 0xFE,
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273 | 0x01, 0x81, 0x41, 0xC1, 0x21, 0xA1, 0x61, 0xE1,
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274 | 0x11, 0x91, 0x51, 0xD1, 0x31, 0xB1, 0x71, 0xF1,
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275 | 0x09, 0x89, 0x49, 0xC9, 0x29, 0xA9, 0x69, 0xE9,
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276 | 0x19, 0x99, 0x59, 0xD9, 0x39, 0xB9, 0x79, 0xF9,
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277 | 0x05, 0x85, 0x45, 0xC5, 0x25, 0xA5, 0x65, 0xE5,
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278 | 0x15, 0x95, 0x55, 0xD5, 0x35, 0xB5, 0x75, 0xF5,
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279 | 0x0D, 0x8D, 0x4D, 0xCD, 0x2D, 0xAD, 0x6D, 0xED,
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280 | 0x1D, 0x9D, 0x5D, 0xDD, 0x3D, 0xBD, 0x7D, 0xFD,
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281 | 0x03, 0x83, 0x43, 0xC3, 0x23, 0xA3, 0x63, 0xE3,
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282 | 0x13, 0x93, 0x53, 0xD3, 0x33, 0xB3, 0x73, 0xF3,
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283 | 0x0B, 0x8B, 0x4B, 0xCB, 0x2B, 0xAB, 0x6B, 0xEB,
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284 | 0x1B, 0x9B, 0x5B, 0xDB, 0x3B, 0xBB, 0x7B, 0xFB,
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285 | 0x07, 0x87, 0x47, 0xC7, 0x27, 0xA7, 0x67, 0xE7,
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286 | 0x17, 0x97, 0x57, 0xD7, 0x37, 0xB7, 0x77, 0xF7,
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287 | 0x0F, 0x8F, 0x4F, 0xCF, 0x2F, 0xAF, 0x6F, 0xEF,
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288 | 0x1F, 0x9F, 0x5F, 0xDF, 0x3F, 0xBF, 0x7F, 0xFF
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289 | };
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290 |
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291 | // BT: removed PNG_CONST, since const was already present
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292 | const static png_byte twobppswaptable[256] = {
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293 | 0x00, 0x40, 0x80, 0xC0, 0x10, 0x50, 0x90, 0xD0,
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294 | 0x20, 0x60, 0xA0, 0xE0, 0x30, 0x70, 0xB0, 0xF0,
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295 | 0x04, 0x44, 0x84, 0xC4, 0x14, 0x54, 0x94, 0xD4,
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296 | 0x24, 0x64, 0xA4, 0xE4, 0x34, 0x74, 0xB4, 0xF4,
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297 | 0x08, 0x48, 0x88, 0xC8, 0x18, 0x58, 0x98, 0xD8,
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298 | 0x28, 0x68, 0xA8, 0xE8, 0x38, 0x78, 0xB8, 0xF8,
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299 | 0x0C, 0x4C, 0x8C, 0xCC, 0x1C, 0x5C, 0x9C, 0xDC,
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300 | 0x2C, 0x6C, 0xAC, 0xEC, 0x3C, 0x7C, 0xBC, 0xFC,
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301 | 0x01, 0x41, 0x81, 0xC1, 0x11, 0x51, 0x91, 0xD1,
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302 | 0x21, 0x61, 0xA1, 0xE1, 0x31, 0x71, 0xB1, 0xF1,
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303 | 0x05, 0x45, 0x85, 0xC5, 0x15, 0x55, 0x95, 0xD5,
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304 | 0x25, 0x65, 0xA5, 0xE5, 0x35, 0x75, 0xB5, 0xF5,
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305 | 0x09, 0x49, 0x89, 0xC9, 0x19, 0x59, 0x99, 0xD9,
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306 | 0x29, 0x69, 0xA9, 0xE9, 0x39, 0x79, 0xB9, 0xF9,
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307 | 0x0D, 0x4D, 0x8D, 0xCD, 0x1D, 0x5D, 0x9D, 0xDD,
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308 | 0x2D, 0x6D, 0xAD, 0xED, 0x3D, 0x7D, 0xBD, 0xFD,
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309 | 0x02, 0x42, 0x82, 0xC2, 0x12, 0x52, 0x92, 0xD2,
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310 | 0x22, 0x62, 0xA2, 0xE2, 0x32, 0x72, 0xB2, 0xF2,
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311 | 0x06, 0x46, 0x86, 0xC6, 0x16, 0x56, 0x96, 0xD6,
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312 | 0x26, 0x66, 0xA6, 0xE6, 0x36, 0x76, 0xB6, 0xF6,
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313 | 0x0A, 0x4A, 0x8A, 0xCA, 0x1A, 0x5A, 0x9A, 0xDA,
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314 | 0x2A, 0x6A, 0xAA, 0xEA, 0x3A, 0x7A, 0xBA, 0xFA,
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315 | 0x0E, 0x4E, 0x8E, 0xCE, 0x1E, 0x5E, 0x9E, 0xDE,
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316 | 0x2E, 0x6E, 0xAE, 0xEE, 0x3E, 0x7E, 0xBE, 0xFE,
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317 | 0x03, 0x43, 0x83, 0xC3, 0x13, 0x53, 0x93, 0xD3,
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318 | 0x23, 0x63, 0xA3, 0xE3, 0x33, 0x73, 0xB3, 0xF3,
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319 | 0x07, 0x47, 0x87, 0xC7, 0x17, 0x57, 0x97, 0xD7,
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320 | 0x27, 0x67, 0xA7, 0xE7, 0x37, 0x77, 0xB7, 0xF7,
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321 | 0x0B, 0x4B, 0x8B, 0xCB, 0x1B, 0x5B, 0x9B, 0xDB,
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322 | 0x2B, 0x6B, 0xAB, 0xEB, 0x3B, 0x7B, 0xBB, 0xFB,
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323 | 0x0F, 0x4F, 0x8F, 0xCF, 0x1F, 0x5F, 0x9F, 0xDF,
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324 | 0x2F, 0x6F, 0xAF, 0xEF, 0x3F, 0x7F, 0xBF, 0xFF
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325 | };
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326 |
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327 | // BT: removed PNG_CONST, since const was already present
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328 | const static png_byte fourbppswaptable[256] = {
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329 | 0x00, 0x10, 0x20, 0x30, 0x40, 0x50, 0x60, 0x70,
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330 | 0x80, 0x90, 0xA0, 0xB0, 0xC0, 0xD0, 0xE0, 0xF0,
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331 | 0x01, 0x11, 0x21, 0x31, 0x41, 0x51, 0x61, 0x71,
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332 | 0x81, 0x91, 0xA1, 0xB1, 0xC1, 0xD1, 0xE1, 0xF1,
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333 | 0x02, 0x12, 0x22, 0x32, 0x42, 0x52, 0x62, 0x72,
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334 | 0x82, 0x92, 0xA2, 0xB2, 0xC2, 0xD2, 0xE2, 0xF2,
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335 | 0x03, 0x13, 0x23, 0x33, 0x43, 0x53, 0x63, 0x73,
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336 | 0x83, 0x93, 0xA3, 0xB3, 0xC3, 0xD3, 0xE3, 0xF3,
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337 | 0x04, 0x14, 0x24, 0x34, 0x44, 0x54, 0x64, 0x74,
|
---|
338 | 0x84, 0x94, 0xA4, 0xB4, 0xC4, 0xD4, 0xE4, 0xF4,
|
---|
339 | 0x05, 0x15, 0x25, 0x35, 0x45, 0x55, 0x65, 0x75,
|
---|
340 | 0x85, 0x95, 0xA5, 0xB5, 0xC5, 0xD5, 0xE5, 0xF5,
|
---|
341 | 0x06, 0x16, 0x26, 0x36, 0x46, 0x56, 0x66, 0x76,
|
---|
342 | 0x86, 0x96, 0xA6, 0xB6, 0xC6, 0xD6, 0xE6, 0xF6,
|
---|
343 | 0x07, 0x17, 0x27, 0x37, 0x47, 0x57, 0x67, 0x77,
|
---|
344 | 0x87, 0x97, 0xA7, 0xB7, 0xC7, 0xD7, 0xE7, 0xF7,
|
---|
345 | 0x08, 0x18, 0x28, 0x38, 0x48, 0x58, 0x68, 0x78,
|
---|
346 | 0x88, 0x98, 0xA8, 0xB8, 0xC8, 0xD8, 0xE8, 0xF8,
|
---|
347 | 0x09, 0x19, 0x29, 0x39, 0x49, 0x59, 0x69, 0x79,
|
---|
348 | 0x89, 0x99, 0xA9, 0xB9, 0xC9, 0xD9, 0xE9, 0xF9,
|
---|
349 | 0x0A, 0x1A, 0x2A, 0x3A, 0x4A, 0x5A, 0x6A, 0x7A,
|
---|
350 | 0x8A, 0x9A, 0xAA, 0xBA, 0xCA, 0xDA, 0xEA, 0xFA,
|
---|
351 | 0x0B, 0x1B, 0x2B, 0x3B, 0x4B, 0x5B, 0x6B, 0x7B,
|
---|
352 | 0x8B, 0x9B, 0xAB, 0xBB, 0xCB, 0xDB, 0xEB, 0xFB,
|
---|
353 | 0x0C, 0x1C, 0x2C, 0x3C, 0x4C, 0x5C, 0x6C, 0x7C,
|
---|
354 | 0x8C, 0x9C, 0xAC, 0xBC, 0xCC, 0xDC, 0xEC, 0xFC,
|
---|
355 | 0x0D, 0x1D, 0x2D, 0x3D, 0x4D, 0x5D, 0x6D, 0x7D,
|
---|
356 | 0x8D, 0x9D, 0xAD, 0xBD, 0xCD, 0xDD, 0xED, 0xFD,
|
---|
357 | 0x0E, 0x1E, 0x2E, 0x3E, 0x4E, 0x5E, 0x6E, 0x7E,
|
---|
358 | 0x8E, 0x9E, 0xAE, 0xBE, 0xCE, 0xDE, 0xEE, 0xFE,
|
---|
359 | 0x0F, 0x1F, 0x2F, 0x3F, 0x4F, 0x5F, 0x6F, 0x7F,
|
---|
360 | 0x8F, 0x9F, 0xAF, 0xBF, 0xCF, 0xDF, 0xEF, 0xFF
|
---|
361 | };
|
---|
362 |
|
---|
363 | /* swaps pixel packing order within bytes */
|
---|
364 | void /* PRIVATE */
|
---|
365 | png_do_packswap(png_row_infop row_info, png_bytep row)
|
---|
366 | {
|
---|
367 | png_debug(1, "in png_do_packswap\n");
|
---|
368 | if (
|
---|
369 | #if defined(PNG_USELESS_TESTS_SUPPORTED)
|
---|
370 | row != NULL && row_info != NULL &&
|
---|
371 | #endif
|
---|
372 | row_info->bit_depth < 8)
|
---|
373 | {
|
---|
374 | png_bytep rp, end, table;
|
---|
375 |
|
---|
376 | end = row + row_info->rowbytes;
|
---|
377 |
|
---|
378 | if (row_info->bit_depth == 1)
|
---|
379 | table = (png_bytep)onebppswaptable;
|
---|
380 | else if (row_info->bit_depth == 2)
|
---|
381 | table = (png_bytep)twobppswaptable;
|
---|
382 | else if (row_info->bit_depth == 4)
|
---|
383 | table = (png_bytep)fourbppswaptable;
|
---|
384 | else
|
---|
385 | return;
|
---|
386 |
|
---|
387 | for (rp = row; rp < end; rp++)
|
---|
388 | *rp = table[*rp];
|
---|
389 | }
|
---|
390 | }
|
---|
391 | #endif /* PNG_READ_PACKSWAP_SUPPORTED or PNG_WRITE_PACKSWAP_SUPPORTED */
|
---|
392 |
|
---|
393 | #if defined(PNG_WRITE_FILLER_SUPPORTED) || \
|
---|
394 | defined(PNG_READ_STRIP_ALPHA_SUPPORTED)
|
---|
395 | /* remove filler or alpha byte(s) */
|
---|
396 | void /* PRIVATE */
|
---|
397 | png_do_strip_filler(png_row_infop row_info, png_bytep row, png_uint_32 flags)
|
---|
398 | {
|
---|
399 | png_debug(1, "in png_do_strip_filler\n");
|
---|
400 | #if defined(PNG_USELESS_TESTS_SUPPORTED)
|
---|
401 | if (row != NULL && row_info != NULL)
|
---|
402 | #endif
|
---|
403 | {
|
---|
404 | png_bytep sp=row;
|
---|
405 | png_bytep dp=row;
|
---|
406 | png_uint_32 row_width=row_info->width;
|
---|
407 | png_uint_32 i;
|
---|
408 |
|
---|
409 | if ((row_info->color_type == PNG_COLOR_TYPE_RGB ||
|
---|
410 | (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA &&
|
---|
411 | (flags & PNG_FLAG_STRIP_ALPHA))) &&
|
---|
412 | row_info->channels == 4)
|
---|
413 | {
|
---|
414 | if (row_info->bit_depth == 8)
|
---|
415 | {
|
---|
416 | /* This converts from RGBX or RGBA to RGB */
|
---|
417 | if (flags & PNG_FLAG_FILLER_AFTER)
|
---|
418 | {
|
---|
419 | dp+=3; sp+=4;
|
---|
420 | for (i = 1; i < row_width; i++)
|
---|
421 | {
|
---|
422 | *dp++ = *sp++;
|
---|
423 | *dp++ = *sp++;
|
---|
424 | *dp++ = *sp++;
|
---|
425 | sp++;
|
---|
426 | }
|
---|
427 | }
|
---|
428 | /* This converts from XRGB or ARGB to RGB */
|
---|
429 | else
|
---|
430 | {
|
---|
431 | for (i = 0; i < row_width; i++)
|
---|
432 | {
|
---|
433 | sp++;
|
---|
434 | *dp++ = *sp++;
|
---|
435 | *dp++ = *sp++;
|
---|
436 | *dp++ = *sp++;
|
---|
437 | }
|
---|
438 | }
|
---|
439 | row_info->pixel_depth = 24;
|
---|
440 | row_info->rowbytes = row_width * 3;
|
---|
441 | }
|
---|
442 | else /* if (row_info->bit_depth == 16) */
|
---|
443 | {
|
---|
444 | if (flags & PNG_FLAG_FILLER_AFTER)
|
---|
445 | {
|
---|
446 | /* This converts from RRGGBBXX or RRGGBBAA to RRGGBB */
|
---|
447 | sp += 8; dp += 6;
|
---|
448 | for (i = 1; i < row_width; i++)
|
---|
449 | {
|
---|
450 | /* This could be (although png_memcpy is probably slower):
|
---|
451 | png_memcpy(dp, sp, 6);
|
---|
452 | sp += 8;
|
---|
453 | dp += 6;
|
---|
454 | */
|
---|
455 |
|
---|
456 | *dp++ = *sp++;
|
---|
457 | *dp++ = *sp++;
|
---|
458 | *dp++ = *sp++;
|
---|
459 | *dp++ = *sp++;
|
---|
460 | *dp++ = *sp++;
|
---|
461 | *dp++ = *sp++;
|
---|
462 | sp += 2;
|
---|
463 | }
|
---|
464 | }
|
---|
465 | else
|
---|
466 | {
|
---|
467 | /* This converts from XXRRGGBB or AARRGGBB to RRGGBB */
|
---|
468 | for (i = 0; i < row_width; i++)
|
---|
469 | {
|
---|
470 | /* This could be (although png_memcpy is probably slower):
|
---|
471 | png_memcpy(dp, sp, 6);
|
---|
472 | sp += 8;
|
---|
473 | dp += 6;
|
---|
474 | */
|
---|
475 |
|
---|
476 | sp+=2;
|
---|
477 | *dp++ = *sp++;
|
---|
478 | *dp++ = *sp++;
|
---|
479 | *dp++ = *sp++;
|
---|
480 | *dp++ = *sp++;
|
---|
481 | *dp++ = *sp++;
|
---|
482 | *dp++ = *sp++;
|
---|
483 | }
|
---|
484 | }
|
---|
485 | row_info->pixel_depth = 48;
|
---|
486 | row_info->rowbytes = row_width * 6;
|
---|
487 | }
|
---|
488 | row_info->channels = 3;
|
---|
489 | }
|
---|
490 | else if ((row_info->color_type == PNG_COLOR_TYPE_GRAY ||
|
---|
491 | (row_info->color_type == PNG_COLOR_TYPE_GRAY_ALPHA &&
|
---|
492 | (flags & PNG_FLAG_STRIP_ALPHA))) &&
|
---|
493 | row_info->channels == 2)
|
---|
494 | {
|
---|
495 | if (row_info->bit_depth == 8)
|
---|
496 | {
|
---|
497 | /* This converts from GX or GA to G */
|
---|
498 | if (flags & PNG_FLAG_FILLER_AFTER)
|
---|
499 | {
|
---|
500 | for (i = 0; i < row_width; i++)
|
---|
501 | {
|
---|
502 | *dp++ = *sp++;
|
---|
503 | sp++;
|
---|
504 | }
|
---|
505 | }
|
---|
506 | /* This converts from XG or AG to G */
|
---|
507 | else
|
---|
508 | {
|
---|
509 | for (i = 0; i < row_width; i++)
|
---|
510 | {
|
---|
511 | sp++;
|
---|
512 | *dp++ = *sp++;
|
---|
513 | }
|
---|
514 | }
|
---|
515 | row_info->pixel_depth = 8;
|
---|
516 | row_info->rowbytes = row_width;
|
---|
517 | }
|
---|
518 | else /* if (row_info->bit_depth == 16) */
|
---|
519 | {
|
---|
520 | if (flags & PNG_FLAG_FILLER_AFTER)
|
---|
521 | {
|
---|
522 | /* This converts from GGXX or GGAA to GG */
|
---|
523 | sp += 4; dp += 2;
|
---|
524 | for (i = 1; i < row_width; i++)
|
---|
525 | {
|
---|
526 | *dp++ = *sp++;
|
---|
527 | *dp++ = *sp++;
|
---|
528 | sp += 2;
|
---|
529 | }
|
---|
530 | }
|
---|
531 | else
|
---|
532 | {
|
---|
533 | /* This converts from XXGG or AAGG to GG */
|
---|
534 | for (i = 0; i < row_width; i++)
|
---|
535 | {
|
---|
536 | sp += 2;
|
---|
537 | *dp++ = *sp++;
|
---|
538 | *dp++ = *sp++;
|
---|
539 | }
|
---|
540 | }
|
---|
541 | row_info->pixel_depth = 16;
|
---|
542 | row_info->rowbytes = row_width * 2;
|
---|
543 | }
|
---|
544 | row_info->channels = 1;
|
---|
545 | }
|
---|
546 | if (flags & PNG_FLAG_STRIP_ALPHA)
|
---|
547 | row_info->color_type &= ~PNG_COLOR_MASK_ALPHA;
|
---|
548 | }
|
---|
549 | }
|
---|
550 | #endif
|
---|
551 |
|
---|
552 | #if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED)
|
---|
553 | /* swaps red and blue bytes within a pixel */
|
---|
554 | void /* PRIVATE */
|
---|
555 | png_do_bgr(png_row_infop row_info, png_bytep row)
|
---|
556 | {
|
---|
557 | png_debug(1, "in png_do_bgr\n");
|
---|
558 | if (
|
---|
559 | #if defined(PNG_USELESS_TESTS_SUPPORTED)
|
---|
560 | row != NULL && row_info != NULL &&
|
---|
561 | #endif
|
---|
562 | (row_info->color_type & PNG_COLOR_MASK_COLOR))
|
---|
563 | {
|
---|
564 | png_uint_32 row_width = row_info->width;
|
---|
565 | if (row_info->bit_depth == 8)
|
---|
566 | {
|
---|
567 | if (row_info->color_type == PNG_COLOR_TYPE_RGB)
|
---|
568 | {
|
---|
569 | png_bytep rp;
|
---|
570 | png_uint_32 i;
|
---|
571 |
|
---|
572 | for (i = 0, rp = row; i < row_width; i++, rp += 3)
|
---|
573 | {
|
---|
574 | png_byte save = *rp;
|
---|
575 | *rp = *(rp + 2);
|
---|
576 | *(rp + 2) = save;
|
---|
577 | }
|
---|
578 | }
|
---|
579 | else if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA)
|
---|
580 | {
|
---|
581 | png_bytep rp;
|
---|
582 | png_uint_32 i;
|
---|
583 |
|
---|
584 | for (i = 0, rp = row; i < row_width; i++, rp += 4)
|
---|
585 | {
|
---|
586 | png_byte save = *rp;
|
---|
587 | *rp = *(rp + 2);
|
---|
588 | *(rp + 2) = save;
|
---|
589 | }
|
---|
590 | }
|
---|
591 | }
|
---|
592 | else if (row_info->bit_depth == 16)
|
---|
593 | {
|
---|
594 | if (row_info->color_type == PNG_COLOR_TYPE_RGB)
|
---|
595 | {
|
---|
596 | png_bytep rp;
|
---|
597 | png_uint_32 i;
|
---|
598 |
|
---|
599 | for (i = 0, rp = row; i < row_width; i++, rp += 6)
|
---|
600 | {
|
---|
601 | png_byte save = *rp;
|
---|
602 | *rp = *(rp + 4);
|
---|
603 | *(rp + 4) = save;
|
---|
604 | save = *(rp + 1);
|
---|
605 | *(rp + 1) = *(rp + 5);
|
---|
606 | *(rp + 5) = save;
|
---|
607 | }
|
---|
608 | }
|
---|
609 | else if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA)
|
---|
610 | {
|
---|
611 | png_bytep rp;
|
---|
612 | png_uint_32 i;
|
---|
613 |
|
---|
614 | for (i = 0, rp = row; i < row_width; i++, rp += 8)
|
---|
615 | {
|
---|
616 | png_byte save = *rp;
|
---|
617 | *rp = *(rp + 4);
|
---|
618 | *(rp + 4) = save;
|
---|
619 | save = *(rp + 1);
|
---|
620 | *(rp + 1) = *(rp + 5);
|
---|
621 | *(rp + 5) = save;
|
---|
622 | }
|
---|
623 | }
|
---|
624 | }
|
---|
625 | }
|
---|
626 | }
|
---|
627 | #endif /* PNG_READ_BGR_SUPPORTED or PNG_WRITE_BGR_SUPPORTED */
|
---|
628 |
|
---|
629 | #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \
|
---|
630 | defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) || \
|
---|
631 | defined(PNG_LEGACY_SUPPORTED)
|
---|
632 | void PNGAPI
|
---|
633 | png_set_user_transform_info(png_structp png_ptr, png_voidp
|
---|
634 | user_transform_ptr, int user_transform_depth, int user_transform_channels)
|
---|
635 | {
|
---|
636 | png_debug(1, "in png_set_user_transform_info\n");
|
---|
637 | if(png_ptr == NULL) return;
|
---|
638 | #if defined(PNG_USER_TRANSFORM_PTR_SUPPORTED)
|
---|
639 | png_ptr->user_transform_ptr = user_transform_ptr;
|
---|
640 | png_ptr->user_transform_depth = (png_byte)user_transform_depth;
|
---|
641 | png_ptr->user_transform_channels = (png_byte)user_transform_channels;
|
---|
642 | #else
|
---|
643 | if(user_transform_ptr || user_transform_depth || user_transform_channels)
|
---|
644 | png_warning(png_ptr,
|
---|
645 | "This version of libpng does not support user transform info");
|
---|
646 | #endif
|
---|
647 | }
|
---|
648 | #endif
|
---|
649 |
|
---|
650 | /* This function returns a pointer to the user_transform_ptr associated with
|
---|
651 | * the user transform functions. The application should free any memory
|
---|
652 | * associated with this pointer before png_write_destroy and png_read_destroy
|
---|
653 | * are called.
|
---|
654 | */
|
---|
655 | png_voidp PNGAPI
|
---|
656 | png_get_user_transform_ptr(png_structp png_ptr)
|
---|
657 | {
|
---|
658 | #if defined(PNG_USER_TRANSFORM_PTR_SUPPORTED)
|
---|
659 | if (png_ptr == NULL) return (NULL);
|
---|
660 | return ((png_voidp)png_ptr->user_transform_ptr);
|
---|
661 | #else
|
---|
662 | return (NULL);
|
---|
663 | #endif
|
---|
664 | }
|
---|
665 | #endif /* PNG_READ_SUPPORTED || PNG_WRITE_SUPPORTED */
|
---|