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Rev | Author | Line No. | Line |
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96 | giacomo | 1 | |
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 | * libpng 1.2.5 - October 3, 2002 |
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5 | * For conditions of distribution and use, see copyright notice in png.h |
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6 | * Copyright (c) 1998-2002 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 | |||
11 | #define PNG_INTERNAL |
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12 | #include "png.h" |
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13 | |||
14 | #if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED) |
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15 | /* turn on BGR-to-RGB mapping */ |
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16 | void PNGAPI |
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17 | png_set_bgr(png_structp png_ptr) |
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18 | { |
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19 | png_debug(1, "in png_set_bgr\n"); |
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20 | png_ptr->transformations |= PNG_BGR; |
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21 | } |
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22 | #endif |
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23 | |||
24 | #if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED) |
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25 | /* turn on 16 bit byte swapping */ |
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26 | void PNGAPI |
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27 | png_set_swap(png_structp png_ptr) |
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28 | { |
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29 | png_debug(1, "in png_set_swap\n"); |
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30 | if (png_ptr->bit_depth == 16) |
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31 | png_ptr->transformations |= PNG_SWAP_BYTES; |
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32 | } |
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33 | #endif |
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34 | |||
35 | #if defined(PNG_READ_PACK_SUPPORTED) || defined(PNG_WRITE_PACK_SUPPORTED) |
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36 | /* turn on pixel packing */ |
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37 | void PNGAPI |
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38 | png_set_packing(png_structp png_ptr) |
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39 | { |
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40 | png_debug(1, "in png_set_packing\n"); |
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41 | if (png_ptr->bit_depth < 8) |
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42 | { |
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43 | png_ptr->transformations |= PNG_PACK; |
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44 | png_ptr->usr_bit_depth = 8; |
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45 | } |
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46 | } |
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47 | #endif |
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48 | |||
49 | #if defined(PNG_READ_PACKSWAP_SUPPORTED)||defined(PNG_WRITE_PACKSWAP_SUPPORTED) |
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50 | /* turn on packed pixel swapping */ |
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51 | void PNGAPI |
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52 | png_set_packswap(png_structp png_ptr) |
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53 | { |
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54 | png_debug(1, "in png_set_packswap\n"); |
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55 | if (png_ptr->bit_depth < 8) |
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56 | png_ptr->transformations |= PNG_PACKSWAP; |
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57 | } |
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58 | #endif |
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59 | |||
60 | #if defined(PNG_READ_SHIFT_SUPPORTED) || defined(PNG_WRITE_SHIFT_SUPPORTED) |
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61 | void PNGAPI |
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62 | png_set_shift(png_structp png_ptr, png_color_8p true_bits) |
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63 | { |
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64 | png_debug(1, "in png_set_shift\n"); |
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65 | png_ptr->transformations |= PNG_SHIFT; |
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66 | png_ptr->shift = *true_bits; |
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67 | } |
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68 | #endif |
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69 | |||
70 | #if defined(PNG_READ_INTERLACING_SUPPORTED) || \ |
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71 | defined(PNG_WRITE_INTERLACING_SUPPORTED) |
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72 | int PNGAPI |
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73 | png_set_interlace_handling(png_structp png_ptr) |
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74 | { |
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75 | png_debug(1, "in png_set_interlace handling\n"); |
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76 | if (png_ptr->interlaced) |
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77 | { |
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78 | png_ptr->transformations |= PNG_INTERLACE; |
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79 | return (7); |
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80 | } |
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81 | |||
82 | return (1); |
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83 | } |
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84 | #endif |
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85 | |||
86 | #if defined(PNG_READ_FILLER_SUPPORTED) || defined(PNG_WRITE_FILLER_SUPPORTED) |
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87 | /* Add a filler byte on read, or remove a filler or alpha byte on write. |
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88 | * The filler type has changed in v0.95 to allow future 2-byte fillers |
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89 | * for 48-bit input data, as well as to avoid problems with some compilers |
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90 | * that don't like bytes as parameters. |
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91 | */ |
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92 | void PNGAPI |
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93 | png_set_filler(png_structp png_ptr, png_uint_32 filler, int filler_loc) |
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94 | { |
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95 | png_debug(1, "in png_set_filler\n"); |
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96 | png_ptr->transformations |= PNG_FILLER; |
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97 | png_ptr->filler = (png_byte)filler; |
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98 | if (filler_loc == PNG_FILLER_AFTER) |
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99 | png_ptr->flags |= PNG_FLAG_FILLER_AFTER; |
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100 | else |
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101 | png_ptr->flags &= ~PNG_FLAG_FILLER_AFTER; |
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102 | |||
103 | /* This should probably go in the "do_filler" routine. |
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104 | * I attempted to do that in libpng-1.0.1a but that caused problems |
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105 | * so I restored it in libpng-1.0.2a |
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106 | */ |
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107 | |||
108 | if (png_ptr->color_type == PNG_COLOR_TYPE_RGB) |
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109 | { |
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110 | png_ptr->usr_channels = 4; |
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111 | } |
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112 | |||
113 | /* Also I added this in libpng-1.0.2a (what happens when we expand |
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114 | * a less-than-8-bit grayscale to GA? */ |
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115 | |||
116 | if (png_ptr->color_type == PNG_COLOR_TYPE_GRAY && png_ptr->bit_depth >= 8) |
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117 | { |
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118 | png_ptr->usr_channels = 2; |
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119 | } |
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120 | } |
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121 | #endif |
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122 | |||
123 | #if defined(PNG_READ_SWAP_ALPHA_SUPPORTED) || \ |
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124 | defined(PNG_WRITE_SWAP_ALPHA_SUPPORTED) |
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125 | void PNGAPI |
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126 | png_set_swap_alpha(png_structp png_ptr) |
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127 | { |
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128 | png_debug(1, "in png_set_swap_alpha\n"); |
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129 | png_ptr->transformations |= PNG_SWAP_ALPHA; |
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130 | } |
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131 | #endif |
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132 | |||
133 | #if defined(PNG_READ_INVERT_ALPHA_SUPPORTED) || \ |
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134 | defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED) |
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135 | void PNGAPI |
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136 | png_set_invert_alpha(png_structp png_ptr) |
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137 | { |
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138 | png_debug(1, "in png_set_invert_alpha\n"); |
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139 | png_ptr->transformations |= PNG_INVERT_ALPHA; |
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140 | } |
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141 | #endif |
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142 | |||
143 | #if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED) |
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144 | void PNGAPI |
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145 | png_set_invert_mono(png_structp png_ptr) |
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146 | { |
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147 | png_debug(1, "in png_set_invert_mono\n"); |
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148 | png_ptr->transformations |= PNG_INVERT_MONO; |
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149 | } |
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150 | |||
151 | /* invert monochrome grayscale data */ |
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152 | void /* PRIVATE */ |
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153 | png_do_invert(png_row_infop row_info, png_bytep row) |
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154 | { |
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155 | png_debug(1, "in png_do_invert\n"); |
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156 | /* This test removed from libpng version 1.0.13 and 1.2.0: |
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157 | * if (row_info->bit_depth == 1 && |
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158 | */ |
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159 | #if defined(PNG_USELESS_TESTS_SUPPORTED) |
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160 | if (row == NULL || row_info == NULL) |
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161 | return; |
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162 | #endif |
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163 | if (row_info->color_type == PNG_COLOR_TYPE_GRAY) |
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164 | { |
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165 | png_bytep rp = row; |
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166 | png_uint_32 i; |
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167 | png_uint_32 istop = row_info->rowbytes; |
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168 | |||
169 | for (i = 0; i < istop; i++) |
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170 | { |
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171 | *rp = (png_byte)(~(*rp)); |
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172 | rp++; |
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173 | } |
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174 | } |
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175 | else if (row_info->color_type == PNG_COLOR_TYPE_GRAY_ALPHA && |
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176 | row_info->bit_depth == 8) |
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177 | { |
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178 | png_bytep rp = row; |
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179 | png_uint_32 i; |
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180 | png_uint_32 istop = row_info->rowbytes; |
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181 | |||
182 | for (i = 0; i < istop; i+=2) |
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183 | { |
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184 | *rp = (png_byte)(~(*rp)); |
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185 | rp+=2; |
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186 | } |
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187 | } |
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188 | else if (row_info->color_type == PNG_COLOR_TYPE_GRAY_ALPHA && |
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189 | row_info->bit_depth == 16) |
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190 | { |
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191 | png_bytep rp = row; |
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192 | png_uint_32 i; |
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193 | png_uint_32 istop = row_info->rowbytes; |
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194 | |||
195 | for (i = 0; i < istop; i+=4) |
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196 | { |
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197 | *rp = (png_byte)(~(*rp)); |
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198 | *(rp+1) = (png_byte)(~(*(rp+1))); |
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199 | rp+=4; |
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200 | } |
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201 | } |
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202 | } |
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203 | #endif |
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204 | |||
205 | #if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED) |
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206 | /* swaps byte order on 16 bit depth images */ |
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207 | void /* PRIVATE */ |
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208 | png_do_swap(png_row_infop row_info, png_bytep row) |
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209 | { |
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210 | png_debug(1, "in png_do_swap\n"); |
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211 | if ( |
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212 | #if defined(PNG_USELESS_TESTS_SUPPORTED) |
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213 | row != NULL && row_info != NULL && |
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214 | #endif |
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215 | row_info->bit_depth == 16) |
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216 | { |
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217 | png_bytep rp = row; |
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218 | png_uint_32 i; |
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219 | png_uint_32 istop= row_info->width * row_info->channels; |
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220 | |||
221 | for (i = 0; i < istop; i++, rp += 2) |
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222 | { |
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223 | png_byte t = *rp; |
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224 | *rp = *(rp + 1); |
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225 | *(rp + 1) = t; |
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226 | } |
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227 | } |
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228 | } |
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229 | #endif |
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230 | |||
231 | #if defined(PNG_READ_PACKSWAP_SUPPORTED)||defined(PNG_WRITE_PACKSWAP_SUPPORTED) |
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232 | static png_byte onebppswaptable[256] = { |
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233 | 0x00, 0x80, 0x40, 0xC0, 0x20, 0xA0, 0x60, 0xE0, |
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234 | 0x10, 0x90, 0x50, 0xD0, 0x30, 0xB0, 0x70, 0xF0, |
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235 | 0x08, 0x88, 0x48, 0xC8, 0x28, 0xA8, 0x68, 0xE8, |
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236 | 0x18, 0x98, 0x58, 0xD8, 0x38, 0xB8, 0x78, 0xF8, |
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237 | 0x04, 0x84, 0x44, 0xC4, 0x24, 0xA4, 0x64, 0xE4, |
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238 | 0x14, 0x94, 0x54, 0xD4, 0x34, 0xB4, 0x74, 0xF4, |
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239 | 0x0C, 0x8C, 0x4C, 0xCC, 0x2C, 0xAC, 0x6C, 0xEC, |
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240 | 0x1C, 0x9C, 0x5C, 0xDC, 0x3C, 0xBC, 0x7C, 0xFC, |
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241 | 0x02, 0x82, 0x42, 0xC2, 0x22, 0xA2, 0x62, 0xE2, |
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242 | 0x12, 0x92, 0x52, 0xD2, 0x32, 0xB2, 0x72, 0xF2, |
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243 | 0x0A, 0x8A, 0x4A, 0xCA, 0x2A, 0xAA, 0x6A, 0xEA, |
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244 | 0x1A, 0x9A, 0x5A, 0xDA, 0x3A, 0xBA, 0x7A, 0xFA, |
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245 | 0x06, 0x86, 0x46, 0xC6, 0x26, 0xA6, 0x66, 0xE6, |
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246 | 0x16, 0x96, 0x56, 0xD6, 0x36, 0xB6, 0x76, 0xF6, |
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247 | 0x0E, 0x8E, 0x4E, 0xCE, 0x2E, 0xAE, 0x6E, 0xEE, |
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248 | 0x1E, 0x9E, 0x5E, 0xDE, 0x3E, 0xBE, 0x7E, 0xFE, |
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249 | 0x01, 0x81, 0x41, 0xC1, 0x21, 0xA1, 0x61, 0xE1, |
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250 | 0x11, 0x91, 0x51, 0xD1, 0x31, 0xB1, 0x71, 0xF1, |
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251 | 0x09, 0x89, 0x49, 0xC9, 0x29, 0xA9, 0x69, 0xE9, |
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252 | 0x19, 0x99, 0x59, 0xD9, 0x39, 0xB9, 0x79, 0xF9, |
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253 | 0x05, 0x85, 0x45, 0xC5, 0x25, 0xA5, 0x65, 0xE5, |
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254 | 0x15, 0x95, 0x55, 0xD5, 0x35, 0xB5, 0x75, 0xF5, |
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255 | 0x0D, 0x8D, 0x4D, 0xCD, 0x2D, 0xAD, 0x6D, 0xED, |
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256 | 0x1D, 0x9D, 0x5D, 0xDD, 0x3D, 0xBD, 0x7D, 0xFD, |
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257 | 0x03, 0x83, 0x43, 0xC3, 0x23, 0xA3, 0x63, 0xE3, |
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258 | 0x13, 0x93, 0x53, 0xD3, 0x33, 0xB3, 0x73, 0xF3, |
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259 | 0x0B, 0x8B, 0x4B, 0xCB, 0x2B, 0xAB, 0x6B, 0xEB, |
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260 | 0x1B, 0x9B, 0x5B, 0xDB, 0x3B, 0xBB, 0x7B, 0xFB, |
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261 | 0x07, 0x87, 0x47, 0xC7, 0x27, 0xA7, 0x67, 0xE7, |
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262 | 0x17, 0x97, 0x57, 0xD7, 0x37, 0xB7, 0x77, 0xF7, |
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263 | 0x0F, 0x8F, 0x4F, 0xCF, 0x2F, 0xAF, 0x6F, 0xEF, |
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264 | 0x1F, 0x9F, 0x5F, 0xDF, 0x3F, 0xBF, 0x7F, 0xFF |
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265 | }; |
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266 | |||
267 | static png_byte twobppswaptable[256] = { |
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268 | 0x00, 0x40, 0x80, 0xC0, 0x10, 0x50, 0x90, 0xD0, |
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269 | 0x20, 0x60, 0xA0, 0xE0, 0x30, 0x70, 0xB0, 0xF0, |
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270 | 0x04, 0x44, 0x84, 0xC4, 0x14, 0x54, 0x94, 0xD4, |
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271 | 0x24, 0x64, 0xA4, 0xE4, 0x34, 0x74, 0xB4, 0xF4, |
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272 | 0x08, 0x48, 0x88, 0xC8, 0x18, 0x58, 0x98, 0xD8, |
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273 | 0x28, 0x68, 0xA8, 0xE8, 0x38, 0x78, 0xB8, 0xF8, |
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274 | 0x0C, 0x4C, 0x8C, 0xCC, 0x1C, 0x5C, 0x9C, 0xDC, |
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275 | 0x2C, 0x6C, 0xAC, 0xEC, 0x3C, 0x7C, 0xBC, 0xFC, |
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276 | 0x01, 0x41, 0x81, 0xC1, 0x11, 0x51, 0x91, 0xD1, |
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277 | 0x21, 0x61, 0xA1, 0xE1, 0x31, 0x71, 0xB1, 0xF1, |
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278 | 0x05, 0x45, 0x85, 0xC5, 0x15, 0x55, 0x95, 0xD5, |
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279 | 0x25, 0x65, 0xA5, 0xE5, 0x35, 0x75, 0xB5, 0xF5, |
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280 | 0x09, 0x49, 0x89, 0xC9, 0x19, 0x59, 0x99, 0xD9, |
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281 | 0x29, 0x69, 0xA9, 0xE9, 0x39, 0x79, 0xB9, 0xF9, |
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282 | 0x0D, 0x4D, 0x8D, 0xCD, 0x1D, 0x5D, 0x9D, 0xDD, |
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283 | 0x2D, 0x6D, 0xAD, 0xED, 0x3D, 0x7D, 0xBD, 0xFD, |
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284 | 0x02, 0x42, 0x82, 0xC2, 0x12, 0x52, 0x92, 0xD2, |
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285 | 0x22, 0x62, 0xA2, 0xE2, 0x32, 0x72, 0xB2, 0xF2, |
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286 | 0x06, 0x46, 0x86, 0xC6, 0x16, 0x56, 0x96, 0xD6, |
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287 | 0x26, 0x66, 0xA6, 0xE6, 0x36, 0x76, 0xB6, 0xF6, |
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288 | 0x0A, 0x4A, 0x8A, 0xCA, 0x1A, 0x5A, 0x9A, 0xDA, |
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289 | 0x2A, 0x6A, 0xAA, 0xEA, 0x3A, 0x7A, 0xBA, 0xFA, |
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290 | 0x0E, 0x4E, 0x8E, 0xCE, 0x1E, 0x5E, 0x9E, 0xDE, |
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291 | 0x2E, 0x6E, 0xAE, 0xEE, 0x3E, 0x7E, 0xBE, 0xFE, |
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292 | 0x03, 0x43, 0x83, 0xC3, 0x13, 0x53, 0x93, 0xD3, |
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293 | 0x23, 0x63, 0xA3, 0xE3, 0x33, 0x73, 0xB3, 0xF3, |
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294 | 0x07, 0x47, 0x87, 0xC7, 0x17, 0x57, 0x97, 0xD7, |
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295 | 0x27, 0x67, 0xA7, 0xE7, 0x37, 0x77, 0xB7, 0xF7, |
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296 | 0x0B, 0x4B, 0x8B, 0xCB, 0x1B, 0x5B, 0x9B, 0xDB, |
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297 | 0x2B, 0x6B, 0xAB, 0xEB, 0x3B, 0x7B, 0xBB, 0xFB, |
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298 | 0x0F, 0x4F, 0x8F, 0xCF, 0x1F, 0x5F, 0x9F, 0xDF, |
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299 | 0x2F, 0x6F, 0xAF, 0xEF, 0x3F, 0x7F, 0xBF, 0xFF |
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300 | }; |
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301 | |||
302 | static png_byte fourbppswaptable[256] = { |
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303 | 0x00, 0x10, 0x20, 0x30, 0x40, 0x50, 0x60, 0x70, |
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304 | 0x80, 0x90, 0xA0, 0xB0, 0xC0, 0xD0, 0xE0, 0xF0, |
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305 | 0x01, 0x11, 0x21, 0x31, 0x41, 0x51, 0x61, 0x71, |
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306 | 0x81, 0x91, 0xA1, 0xB1, 0xC1, 0xD1, 0xE1, 0xF1, |
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307 | 0x02, 0x12, 0x22, 0x32, 0x42, 0x52, 0x62, 0x72, |
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308 | 0x82, 0x92, 0xA2, 0xB2, 0xC2, 0xD2, 0xE2, 0xF2, |
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309 | 0x03, 0x13, 0x23, 0x33, 0x43, 0x53, 0x63, 0x73, |
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310 | 0x83, 0x93, 0xA3, 0xB3, 0xC3, 0xD3, 0xE3, 0xF3, |
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311 | 0x04, 0x14, 0x24, 0x34, 0x44, 0x54, 0x64, 0x74, |
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312 | 0x84, 0x94, 0xA4, 0xB4, 0xC4, 0xD4, 0xE4, 0xF4, |
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313 | 0x05, 0x15, 0x25, 0x35, 0x45, 0x55, 0x65, 0x75, |
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314 | 0x85, 0x95, 0xA5, 0xB5, 0xC5, 0xD5, 0xE5, 0xF5, |
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315 | 0x06, 0x16, 0x26, 0x36, 0x46, 0x56, 0x66, 0x76, |
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316 | 0x86, 0x96, 0xA6, 0xB6, 0xC6, 0xD6, 0xE6, 0xF6, |
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317 | 0x07, 0x17, 0x27, 0x37, 0x47, 0x57, 0x67, 0x77, |
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318 | 0x87, 0x97, 0xA7, 0xB7, 0xC7, 0xD7, 0xE7, 0xF7, |
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319 | 0x08, 0x18, 0x28, 0x38, 0x48, 0x58, 0x68, 0x78, |
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320 | 0x88, 0x98, 0xA8, 0xB8, 0xC8, 0xD8, 0xE8, 0xF8, |
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321 | 0x09, 0x19, 0x29, 0x39, 0x49, 0x59, 0x69, 0x79, |
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322 | 0x89, 0x99, 0xA9, 0xB9, 0xC9, 0xD9, 0xE9, 0xF9, |
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323 | 0x0A, 0x1A, 0x2A, 0x3A, 0x4A, 0x5A, 0x6A, 0x7A, |
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324 | 0x8A, 0x9A, 0xAA, 0xBA, 0xCA, 0xDA, 0xEA, 0xFA, |
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325 | 0x0B, 0x1B, 0x2B, 0x3B, 0x4B, 0x5B, 0x6B, 0x7B, |
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326 | 0x8B, 0x9B, 0xAB, 0xBB, 0xCB, 0xDB, 0xEB, 0xFB, |
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327 | 0x0C, 0x1C, 0x2C, 0x3C, 0x4C, 0x5C, 0x6C, 0x7C, |
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328 | 0x8C, 0x9C, 0xAC, 0xBC, 0xCC, 0xDC, 0xEC, 0xFC, |
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329 | 0x0D, 0x1D, 0x2D, 0x3D, 0x4D, 0x5D, 0x6D, 0x7D, |
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330 | 0x8D, 0x9D, 0xAD, 0xBD, 0xCD, 0xDD, 0xED, 0xFD, |
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331 | 0x0E, 0x1E, 0x2E, 0x3E, 0x4E, 0x5E, 0x6E, 0x7E, |
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332 | 0x8E, 0x9E, 0xAE, 0xBE, 0xCE, 0xDE, 0xEE, 0xFE, |
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333 | 0x0F, 0x1F, 0x2F, 0x3F, 0x4F, 0x5F, 0x6F, 0x7F, |
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334 | 0x8F, 0x9F, 0xAF, 0xBF, 0xCF, 0xDF, 0xEF, 0xFF |
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335 | }; |
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336 | |||
337 | /* swaps pixel packing order within bytes */ |
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338 | void /* PRIVATE */ |
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339 | png_do_packswap(png_row_infop row_info, png_bytep row) |
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340 | { |
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341 | png_debug(1, "in png_do_packswap\n"); |
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342 | if ( |
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343 | #if defined(PNG_USELESS_TESTS_SUPPORTED) |
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344 | row != NULL && row_info != NULL && |
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345 | #endif |
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346 | row_info->bit_depth < 8) |
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347 | { |
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348 | png_bytep rp, end, table; |
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349 | |||
350 | end = row + row_info->rowbytes; |
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351 | |||
352 | if (row_info->bit_depth == 1) |
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353 | table = onebppswaptable; |
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354 | else if (row_info->bit_depth == 2) |
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355 | table = twobppswaptable; |
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356 | else if (row_info->bit_depth == 4) |
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357 | table = fourbppswaptable; |
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358 | else |
||
359 | return; |
||
360 | |||
361 | for (rp = row; rp < end; rp++) |
||
362 | *rp = table[*rp]; |
||
363 | } |
||
364 | } |
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365 | #endif /* PNG_READ_PACKSWAP_SUPPORTED or PNG_WRITE_PACKSWAP_SUPPORTED */ |
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366 | |||
367 | #if defined(PNG_WRITE_FILLER_SUPPORTED) || \ |
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368 | defined(PNG_READ_STRIP_ALPHA_SUPPORTED) |
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369 | /* remove filler or alpha byte(s) */ |
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370 | void /* PRIVATE */ |
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371 | png_do_strip_filler(png_row_infop row_info, png_bytep row, png_uint_32 flags) |
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372 | { |
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373 | png_debug(1, "in png_do_strip_filler\n"); |
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374 | #if defined(PNG_USELESS_TESTS_SUPPORTED) |
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375 | if (row != NULL && row_info != NULL) |
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376 | #endif |
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377 | { |
||
378 | /* |
||
379 | if (row_info->color_type == PNG_COLOR_TYPE_RGB || |
||
380 | row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA) |
||
381 | */ |
||
382 | png_bytep sp=row; |
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383 | png_bytep dp=row; |
||
384 | png_uint_32 row_width=row_info->width; |
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385 | png_uint_32 i; |
||
386 | |||
387 | if (row_info->channels == 4) |
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388 | { |
||
389 | if (row_info->bit_depth == 8) |
||
390 | { |
||
391 | /* This converts from RGBX or RGBA to RGB */ |
||
392 | if (flags & PNG_FLAG_FILLER_AFTER) |
||
393 | { |
||
394 | dp+=3; sp+=4; |
||
395 | for (i = 1; i < row_width; i++) |
||
396 | { |
||
397 | *dp++ = *sp++; |
||
398 | *dp++ = *sp++; |
||
399 | *dp++ = *sp++; |
||
400 | sp++; |
||
401 | } |
||
402 | } |
||
403 | /* This converts from XRGB or ARGB to RGB */ |
||
404 | else |
||
405 | { |
||
406 | for (i = 0; i < row_width; i++) |
||
407 | { |
||
408 | sp++; |
||
409 | *dp++ = *sp++; |
||
410 | *dp++ = *sp++; |
||
411 | *dp++ = *sp++; |
||
412 | } |
||
413 | } |
||
414 | row_info->pixel_depth = 24; |
||
415 | row_info->rowbytes = row_width * 3; |
||
416 | } |
||
417 | else /* if (row_info->bit_depth == 16) */ |
||
418 | { |
||
419 | if (flags & PNG_FLAG_FILLER_AFTER) |
||
420 | { |
||
421 | /* This converts from RRGGBBXX or RRGGBBAA to RRGGBB */ |
||
422 | sp += 8; dp += 6; |
||
423 | for (i = 1; i < row_width; i++) |
||
424 | { |
||
425 | /* This could be (although png_memcpy is probably slower): |
||
426 | png_memcpy(dp, sp, 6); |
||
427 | sp += 8; |
||
428 | dp += 6; |
||
429 | */ |
||
430 | |||
431 | *dp++ = *sp++; |
||
432 | *dp++ = *sp++; |
||
433 | *dp++ = *sp++; |
||
434 | *dp++ = *sp++; |
||
435 | *dp++ = *sp++; |
||
436 | *dp++ = *sp++; |
||
437 | sp += 2; |
||
438 | } |
||
439 | } |
||
440 | else |
||
441 | { |
||
442 | /* This converts from XXRRGGBB or AARRGGBB to RRGGBB */ |
||
443 | for (i = 0; i < row_width; i++) |
||
444 | { |
||
445 | /* This could be (although png_memcpy is probably slower): |
||
446 | png_memcpy(dp, sp, 6); |
||
447 | sp += 8; |
||
448 | dp += 6; |
||
449 | */ |
||
450 | |||
451 | sp+=2; |
||
452 | *dp++ = *sp++; |
||
453 | *dp++ = *sp++; |
||
454 | *dp++ = *sp++; |
||
455 | *dp++ = *sp++; |
||
456 | *dp++ = *sp++; |
||
457 | *dp++ = *sp++; |
||
458 | } |
||
459 | } |
||
460 | row_info->pixel_depth = 48; |
||
461 | row_info->rowbytes = row_width * 6; |
||
462 | } |
||
463 | row_info->channels = 3; |
||
464 | row_info->color_type &= ~PNG_COLOR_MASK_ALPHA; |
||
465 | } |
||
466 | /* |
||
467 | else if (row_info->color_type == PNG_COLOR_TYPE_GRAY || |
||
468 | row_info->color_type == PNG_COLOR_TYPE_GRAY_ALPHA) |
||
469 | */ |
||
470 | else if (row_info->channels == 2) |
||
471 | { |
||
472 | if (row_info->bit_depth == 8) |
||
473 | { |
||
474 | /* This converts from GX or GA to G */ |
||
475 | if (flags & PNG_FLAG_FILLER_AFTER) |
||
476 | { |
||
477 | for (i = 0; i < row_width; i++) |
||
478 | { |
||
479 | *dp++ = *sp++; |
||
480 | sp++; |
||
481 | } |
||
482 | } |
||
483 | /* This converts from XG or AG to G */ |
||
484 | else |
||
485 | { |
||
486 | for (i = 0; i < row_width; i++) |
||
487 | { |
||
488 | sp++; |
||
489 | *dp++ = *sp++; |
||
490 | } |
||
491 | } |
||
492 | row_info->pixel_depth = 8; |
||
493 | row_info->rowbytes = row_width; |
||
494 | } |
||
495 | else /* if (row_info->bit_depth == 16) */ |
||
496 | { |
||
497 | if (flags & PNG_FLAG_FILLER_AFTER) |
||
498 | { |
||
499 | /* This converts from GGXX or GGAA to GG */ |
||
500 | sp += 4; dp += 2; |
||
501 | for (i = 1; i < row_width; i++) |
||
502 | { |
||
503 | *dp++ = *sp++; |
||
504 | *dp++ = *sp++; |
||
505 | sp += 2; |
||
506 | } |
||
507 | } |
||
508 | else |
||
509 | { |
||
510 | /* This converts from XXGG or AAGG to GG */ |
||
511 | for (i = 0; i < row_width; i++) |
||
512 | { |
||
513 | sp += 2; |
||
514 | *dp++ = *sp++; |
||
515 | *dp++ = *sp++; |
||
516 | } |
||
517 | } |
||
518 | row_info->pixel_depth = 16; |
||
519 | row_info->rowbytes = row_width * 2; |
||
520 | } |
||
521 | row_info->channels = 1; |
||
522 | row_info->color_type &= ~PNG_COLOR_MASK_ALPHA; |
||
523 | } |
||
524 | } |
||
525 | } |
||
526 | #endif |
||
527 | |||
528 | #if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED) |
||
529 | /* swaps red and blue bytes within a pixel */ |
||
530 | void /* PRIVATE */ |
||
531 | png_do_bgr(png_row_infop row_info, png_bytep row) |
||
532 | { |
||
533 | png_debug(1, "in png_do_bgr\n"); |
||
534 | if ( |
||
535 | #if defined(PNG_USELESS_TESTS_SUPPORTED) |
||
536 | row != NULL && row_info != NULL && |
||
537 | #endif |
||
538 | (row_info->color_type & PNG_COLOR_MASK_COLOR)) |
||
539 | { |
||
540 | png_uint_32 row_width = row_info->width; |
||
541 | if (row_info->bit_depth == 8) |
||
542 | { |
||
543 | if (row_info->color_type == PNG_COLOR_TYPE_RGB) |
||
544 | { |
||
545 | png_bytep rp; |
||
546 | png_uint_32 i; |
||
547 | |||
548 | for (i = 0, rp = row; i < row_width; i++, rp += 3) |
||
549 | { |
||
550 | png_byte save = *rp; |
||
551 | *rp = *(rp + 2); |
||
552 | *(rp + 2) = save; |
||
553 | } |
||
554 | } |
||
555 | else if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA) |
||
556 | { |
||
557 | png_bytep rp; |
||
558 | png_uint_32 i; |
||
559 | |||
560 | for (i = 0, rp = row; i < row_width; i++, rp += 4) |
||
561 | { |
||
562 | png_byte save = *rp; |
||
563 | *rp = *(rp + 2); |
||
564 | *(rp + 2) = save; |
||
565 | } |
||
566 | } |
||
567 | } |
||
568 | else if (row_info->bit_depth == 16) |
||
569 | { |
||
570 | if (row_info->color_type == PNG_COLOR_TYPE_RGB) |
||
571 | { |
||
572 | png_bytep rp; |
||
573 | png_uint_32 i; |
||
574 | |||
575 | for (i = 0, rp = row; i < row_width; i++, rp += 6) |
||
576 | { |
||
577 | png_byte save = *rp; |
||
578 | *rp = *(rp + 4); |
||
579 | *(rp + 4) = save; |
||
580 | save = *(rp + 1); |
||
581 | *(rp + 1) = *(rp + 5); |
||
582 | *(rp + 5) = save; |
||
583 | } |
||
584 | } |
||
585 | else if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA) |
||
586 | { |
||
587 | png_bytep rp; |
||
588 | png_uint_32 i; |
||
589 | |||
590 | for (i = 0, rp = row; i < row_width; i++, rp += 8) |
||
591 | { |
||
592 | png_byte save = *rp; |
||
593 | *rp = *(rp + 4); |
||
594 | *(rp + 4) = save; |
||
595 | save = *(rp + 1); |
||
596 | *(rp + 1) = *(rp + 5); |
||
597 | *(rp + 5) = save; |
||
598 | } |
||
599 | } |
||
600 | } |
||
601 | } |
||
602 | } |
||
603 | #endif /* PNG_READ_BGR_SUPPORTED or PNG_WRITE_BGR_SUPPORTED */ |
||
604 | |||
605 | #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \ |
||
606 | defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) || \ |
||
607 | defined(PNG_LEGACY_SUPPORTED) |
||
608 | void PNGAPI |
||
609 | png_set_user_transform_info(png_structp png_ptr, png_voidp |
||
610 | user_transform_ptr, int user_transform_depth, int user_transform_channels) |
||
611 | { |
||
612 | png_debug(1, "in png_set_user_transform_info\n"); |
||
613 | #if defined(PNG_USER_TRANSFORM_PTR_SUPPORTED) |
||
614 | png_ptr->user_transform_ptr = user_transform_ptr; |
||
615 | png_ptr->user_transform_depth = (png_byte)user_transform_depth; |
||
616 | png_ptr->user_transform_channels = (png_byte)user_transform_channels; |
||
617 | #else |
||
618 | if(user_transform_ptr || user_transform_depth || user_transform_channels) |
||
619 | png_warning(png_ptr, |
||
620 | "This version of libpng does not support user transform info"); |
||
621 | #endif |
||
622 | } |
||
623 | #endif |
||
624 | |||
625 | /* This function returns a pointer to the user_transform_ptr associated with |
||
626 | * the user transform functions. The application should free any memory |
||
627 | * associated with this pointer before png_write_destroy and png_read_destroy |
||
628 | * are called. |
||
629 | */ |
||
630 | png_voidp PNGAPI |
||
631 | png_get_user_transform_ptr(png_structp png_ptr) |
||
632 | { |
||
633 | #if defined(PNG_USER_TRANSFORM_PTR_SUPPORTED) |
||
634 | return ((png_voidp)png_ptr->user_transform_ptr); |
||
635 | #else |
||
636 | if(png_ptr) |
||
637 | return (NULL); |
||
638 | return (NULL); |
||
639 | #endif |
||
640 | } |