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Rev | Author | Line No. | Line |
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4349 | Serge | 1 | |
2 | * |
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3 | * Last changed in libpng 1.6.2 [April 25, 2013] |
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4 | * Copyright (c) 1998-2013 Glenn Randers-Pehrson |
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5 | * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger) |
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6 | * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.) |
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7 | * |
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8 | * This code is released under the libpng license. |
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9 | * For conditions of distribution and use, see the disclaimer |
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10 | * and license in png.h |
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11 | */ |
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12 | |||
13 | |||
14 | |||
15 | |||
16 | |||
17 | |||
18 | /* Turn on BGR-to-RGB mapping */ |
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19 | void PNGAPI |
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20 | png_set_bgr(png_structrp png_ptr) |
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21 | { |
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22 | png_debug(1, "in png_set_bgr"); |
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23 | |||
24 | |||
25 | return; |
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26 | |||
27 | |||
28 | } |
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29 | #endif |
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30 | |||
31 | |||
32 | /* Turn on 16 bit byte swapping */ |
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33 | void PNGAPI |
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34 | png_set_swap(png_structrp png_ptr) |
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35 | { |
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36 | png_debug(1, "in png_set_swap"); |
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37 | |||
38 | |||
39 | return; |
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40 | |||
41 | |||
42 | png_ptr->transformations |= PNG_SWAP_BYTES; |
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43 | } |
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44 | #endif |
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45 | |||
46 | |||
47 | /* Turn on pixel packing */ |
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48 | void PNGAPI |
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49 | png_set_packing(png_structrp png_ptr) |
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50 | { |
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51 | png_debug(1, "in png_set_packing"); |
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52 | |||
53 | |||
54 | return; |
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55 | |||
56 | |||
57 | { |
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58 | png_ptr->transformations |= PNG_PACK; |
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59 | png_ptr->usr_bit_depth = 8; |
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60 | } |
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61 | } |
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62 | #endif |
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63 | |||
64 | |||
65 | /* Turn on packed pixel swapping */ |
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66 | void PNGAPI |
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67 | png_set_packswap(png_structrp png_ptr) |
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68 | { |
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69 | png_debug(1, "in png_set_packswap"); |
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70 | |||
71 | |||
72 | return; |
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73 | |||
74 | |||
75 | png_ptr->transformations |= PNG_PACKSWAP; |
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76 | } |
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77 | #endif |
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78 | |||
79 | |||
80 | void PNGAPI |
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81 | png_set_shift(png_structrp png_ptr, png_const_color_8p true_bits) |
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82 | { |
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83 | png_debug(1, "in png_set_shift"); |
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84 | |||
85 | |||
86 | return; |
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87 | |||
88 | |||
89 | png_ptr->shift = *true_bits; |
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90 | } |
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91 | #endif |
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92 | |||
93 | |||
94 | defined(PNG_WRITE_INTERLACING_SUPPORTED) |
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95 | int PNGAPI |
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96 | png_set_interlace_handling(png_structrp png_ptr) |
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97 | { |
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98 | png_debug(1, "in png_set_interlace handling"); |
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99 | |||
100 | |||
101 | { |
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102 | png_ptr->transformations |= PNG_INTERLACE; |
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103 | return (7); |
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104 | } |
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105 | |||
106 | |||
107 | } |
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108 | #endif |
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109 | |||
110 | |||
111 | /* Add a filler byte on read, or remove a filler or alpha byte on write. |
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112 | * The filler type has changed in v0.95 to allow future 2-byte fillers |
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113 | * for 48-bit input data, as well as to avoid problems with some compilers |
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114 | * that don't like bytes as parameters. |
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115 | */ |
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116 | void PNGAPI |
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117 | png_set_filler(png_structrp png_ptr, png_uint_32 filler, int filler_loc) |
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118 | { |
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119 | png_debug(1, "in png_set_filler"); |
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120 | |||
121 | |||
122 | return; |
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123 | |||
124 | |||
125 | * operation and therefore to do more checking here for a valid call. |
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126 | */ |
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127 | if (png_ptr->mode & PNG_IS_READ_STRUCT) |
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128 | { |
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129 | # ifdef PNG_READ_FILLER_SUPPORTED |
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130 | /* On read png_set_filler is always valid, regardless of the base PNG |
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131 | * format, because other transformations can give a format where the |
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132 | * filler code can execute (basically an 8 or 16-bit component RGB or G |
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133 | * format.) |
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134 | * |
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135 | * NOTE: usr_channels is not used by the read code! (This has led to |
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136 | * confusion in the past.) The filler is only used in the read code. |
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137 | */ |
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138 | png_ptr->filler = (png_uint_16)filler; |
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139 | # else |
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140 | png_app_error(png_ptr, "png_set_filler not supported on read"); |
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141 | PNG_UNUSED(filler) /* not used in the write case */ |
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142 | return; |
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143 | # endif |
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144 | } |
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145 | |||
146 | |||
147 | { |
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148 | # ifdef PNG_WRITE_FILLER_SUPPORTED |
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149 | /* On write the usr_channels parameter must be set correctly at the |
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150 | * start to record the number of channels in the app-supplied data. |
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151 | */ |
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152 | switch (png_ptr->color_type) |
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153 | { |
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154 | case PNG_COLOR_TYPE_RGB: |
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155 | png_ptr->usr_channels = 4; |
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156 | break; |
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157 | |||
158 | |||
159 | if (png_ptr->bit_depth >= 8) |
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160 | { |
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161 | png_ptr->usr_channels = 2; |
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162 | break; |
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163 | } |
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164 | |||
165 | |||
166 | { |
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167 | /* There simply isn't any code in libpng to strip out bits |
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168 | * from bytes when the components are less than a byte in |
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169 | * size! |
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170 | */ |
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171 | png_app_error(png_ptr, |
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172 | "png_set_filler is invalid for low bit depth gray output"); |
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173 | return; |
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174 | } |
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175 | |||
176 | |||
177 | png_app_error(png_ptr, |
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178 | "png_set_filler: inappropriate color type"); |
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179 | return; |
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180 | } |
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181 | # else |
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182 | png_app_error(png_ptr, "png_set_filler not supported on write"); |
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183 | return; |
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184 | # endif |
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185 | } |
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186 | |||
187 | |||
188 | * and the flag to say where the filler channel is. |
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189 | */ |
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190 | png_ptr->transformations |= PNG_FILLER; |
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191 | |||
192 | |||
193 | png_ptr->flags |= PNG_FLAG_FILLER_AFTER; |
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194 | |||
195 | |||
196 | png_ptr->flags &= ~PNG_FLAG_FILLER_AFTER; |
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197 | } |
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198 | |||
199 | |||
200 | void PNGAPI |
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201 | png_set_add_alpha(png_structrp png_ptr, png_uint_32 filler, int filler_loc) |
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202 | { |
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203 | png_debug(1, "in png_set_add_alpha"); |
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204 | |||
205 | |||
206 | return; |
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207 | |||
208 | |||
209 | /* The above may fail to do anything. */ |
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210 | if (png_ptr->transformations & PNG_FILLER) |
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211 | png_ptr->transformations |= PNG_ADD_ALPHA; |
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212 | } |
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213 | |||
214 | |||
215 | |||
216 | |||
217 | defined(PNG_WRITE_SWAP_ALPHA_SUPPORTED) |
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218 | void PNGAPI |
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219 | png_set_swap_alpha(png_structrp png_ptr) |
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220 | { |
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221 | png_debug(1, "in png_set_swap_alpha"); |
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222 | |||
223 | |||
224 | return; |
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225 | |||
226 | |||
227 | } |
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228 | #endif |
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229 | |||
230 | |||
231 | defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED) |
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232 | void PNGAPI |
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233 | png_set_invert_alpha(png_structrp png_ptr) |
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234 | { |
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235 | png_debug(1, "in png_set_invert_alpha"); |
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236 | |||
237 | |||
238 | return; |
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239 | |||
240 | |||
241 | } |
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242 | #endif |
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243 | |||
244 | |||
245 | void PNGAPI |
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246 | png_set_invert_mono(png_structrp png_ptr) |
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247 | { |
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248 | png_debug(1, "in png_set_invert_mono"); |
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249 | |||
250 | |||
251 | return; |
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252 | |||
253 | |||
254 | } |
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255 | |||
256 | |||
257 | void /* PRIVATE */ |
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258 | png_do_invert(png_row_infop row_info, png_bytep row) |
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259 | { |
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260 | png_debug(1, "in png_do_invert"); |
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261 | |||
262 | |||
263 | * if (row_info->bit_depth == 1 && |
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264 | */ |
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265 | if (row_info->color_type == PNG_COLOR_TYPE_GRAY) |
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266 | { |
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267 | png_bytep rp = row; |
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268 | png_size_t i; |
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269 | png_size_t istop = row_info->rowbytes; |
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270 | |||
271 | |||
272 | { |
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273 | *rp = (png_byte)(~(*rp)); |
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274 | rp++; |
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275 | } |
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276 | } |
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277 | |||
278 | |||
279 | row_info->bit_depth == 8) |
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280 | { |
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281 | png_bytep rp = row; |
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282 | png_size_t i; |
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283 | png_size_t istop = row_info->rowbytes; |
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284 | |||
285 | |||
286 | { |
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287 | *rp = (png_byte)(~(*rp)); |
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288 | rp += 2; |
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289 | } |
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290 | } |
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291 | |||
292 | |||
293 | else if (row_info->color_type == PNG_COLOR_TYPE_GRAY_ALPHA && |
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294 | row_info->bit_depth == 16) |
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295 | { |
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296 | png_bytep rp = row; |
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297 | png_size_t i; |
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298 | png_size_t istop = row_info->rowbytes; |
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299 | |||
300 | |||
301 | { |
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302 | *rp = (png_byte)(~(*rp)); |
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303 | *(rp + 1) = (png_byte)(~(*(rp + 1))); |
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304 | rp += 4; |
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305 | } |
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306 | } |
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307 | #endif |
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308 | } |
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309 | #endif |
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310 | |||
311 | |||
312 | #if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED) |
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313 | /* Swaps byte order on 16 bit depth images */ |
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314 | void /* PRIVATE */ |
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315 | png_do_swap(png_row_infop row_info, png_bytep row) |
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316 | { |
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317 | png_debug(1, "in png_do_swap"); |
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318 | |||
319 | |||
320 | { |
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321 | png_bytep rp = row; |
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322 | png_uint_32 i; |
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323 | png_uint_32 istop= row_info->width * row_info->channels; |
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324 | |||
325 | |||
326 | { |
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327 | png_byte t = *rp; |
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328 | *rp = *(rp + 1); |
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329 | *(rp + 1) = t; |
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330 | } |
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331 | } |
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332 | } |
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333 | #endif |
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334 | #endif |
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335 | |||
336 | |||
337 | static PNG_CONST png_byte onebppswaptable[256] = { |
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338 | 0x00, 0x80, 0x40, 0xC0, 0x20, 0xA0, 0x60, 0xE0, |
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339 | 0x10, 0x90, 0x50, 0xD0, 0x30, 0xB0, 0x70, 0xF0, |
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340 | 0x08, 0x88, 0x48, 0xC8, 0x28, 0xA8, 0x68, 0xE8, |
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341 | 0x18, 0x98, 0x58, 0xD8, 0x38, 0xB8, 0x78, 0xF8, |
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342 | 0x04, 0x84, 0x44, 0xC4, 0x24, 0xA4, 0x64, 0xE4, |
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343 | 0x14, 0x94, 0x54, 0xD4, 0x34, 0xB4, 0x74, 0xF4, |
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344 | 0x0C, 0x8C, 0x4C, 0xCC, 0x2C, 0xAC, 0x6C, 0xEC, |
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345 | 0x1C, 0x9C, 0x5C, 0xDC, 0x3C, 0xBC, 0x7C, 0xFC, |
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346 | 0x02, 0x82, 0x42, 0xC2, 0x22, 0xA2, 0x62, 0xE2, |
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347 | 0x12, 0x92, 0x52, 0xD2, 0x32, 0xB2, 0x72, 0xF2, |
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348 | 0x0A, 0x8A, 0x4A, 0xCA, 0x2A, 0xAA, 0x6A, 0xEA, |
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349 | 0x1A, 0x9A, 0x5A, 0xDA, 0x3A, 0xBA, 0x7A, 0xFA, |
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350 | 0x06, 0x86, 0x46, 0xC6, 0x26, 0xA6, 0x66, 0xE6, |
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351 | 0x16, 0x96, 0x56, 0xD6, 0x36, 0xB6, 0x76, 0xF6, |
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352 | 0x0E, 0x8E, 0x4E, 0xCE, 0x2E, 0xAE, 0x6E, 0xEE, |
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353 | 0x1E, 0x9E, 0x5E, 0xDE, 0x3E, 0xBE, 0x7E, 0xFE, |
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354 | 0x01, 0x81, 0x41, 0xC1, 0x21, 0xA1, 0x61, 0xE1, |
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355 | 0x11, 0x91, 0x51, 0xD1, 0x31, 0xB1, 0x71, 0xF1, |
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356 | 0x09, 0x89, 0x49, 0xC9, 0x29, 0xA9, 0x69, 0xE9, |
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357 | 0x19, 0x99, 0x59, 0xD9, 0x39, 0xB9, 0x79, 0xF9, |
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358 | 0x05, 0x85, 0x45, 0xC5, 0x25, 0xA5, 0x65, 0xE5, |
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359 | 0x15, 0x95, 0x55, 0xD5, 0x35, 0xB5, 0x75, 0xF5, |
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360 | 0x0D, 0x8D, 0x4D, 0xCD, 0x2D, 0xAD, 0x6D, 0xED, |
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361 | 0x1D, 0x9D, 0x5D, 0xDD, 0x3D, 0xBD, 0x7D, 0xFD, |
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362 | 0x03, 0x83, 0x43, 0xC3, 0x23, 0xA3, 0x63, 0xE3, |
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363 | 0x13, 0x93, 0x53, 0xD3, 0x33, 0xB3, 0x73, 0xF3, |
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364 | 0x0B, 0x8B, 0x4B, 0xCB, 0x2B, 0xAB, 0x6B, 0xEB, |
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365 | 0x1B, 0x9B, 0x5B, 0xDB, 0x3B, 0xBB, 0x7B, 0xFB, |
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366 | 0x07, 0x87, 0x47, 0xC7, 0x27, 0xA7, 0x67, 0xE7, |
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367 | 0x17, 0x97, 0x57, 0xD7, 0x37, 0xB7, 0x77, 0xF7, |
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368 | 0x0F, 0x8F, 0x4F, 0xCF, 0x2F, 0xAF, 0x6F, 0xEF, |
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369 | 0x1F, 0x9F, 0x5F, 0xDF, 0x3F, 0xBF, 0x7F, 0xFF |
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370 | }; |
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371 | |||
372 | |||
373 | 0x00, 0x40, 0x80, 0xC0, 0x10, 0x50, 0x90, 0xD0, |
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374 | 0x20, 0x60, 0xA0, 0xE0, 0x30, 0x70, 0xB0, 0xF0, |
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375 | 0x04, 0x44, 0x84, 0xC4, 0x14, 0x54, 0x94, 0xD4, |
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376 | 0x24, 0x64, 0xA4, 0xE4, 0x34, 0x74, 0xB4, 0xF4, |
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377 | 0x08, 0x48, 0x88, 0xC8, 0x18, 0x58, 0x98, 0xD8, |
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378 | 0x28, 0x68, 0xA8, 0xE8, 0x38, 0x78, 0xB8, 0xF8, |
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379 | 0x0C, 0x4C, 0x8C, 0xCC, 0x1C, 0x5C, 0x9C, 0xDC, |
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380 | 0x2C, 0x6C, 0xAC, 0xEC, 0x3C, 0x7C, 0xBC, 0xFC, |
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381 | 0x01, 0x41, 0x81, 0xC1, 0x11, 0x51, 0x91, 0xD1, |
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382 | 0x21, 0x61, 0xA1, 0xE1, 0x31, 0x71, 0xB1, 0xF1, |
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383 | 0x05, 0x45, 0x85, 0xC5, 0x15, 0x55, 0x95, 0xD5, |
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384 | 0x25, 0x65, 0xA5, 0xE5, 0x35, 0x75, 0xB5, 0xF5, |
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385 | 0x09, 0x49, 0x89, 0xC9, 0x19, 0x59, 0x99, 0xD9, |
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386 | 0x29, 0x69, 0xA9, 0xE9, 0x39, 0x79, 0xB9, 0xF9, |
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387 | 0x0D, 0x4D, 0x8D, 0xCD, 0x1D, 0x5D, 0x9D, 0xDD, |
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388 | 0x2D, 0x6D, 0xAD, 0xED, 0x3D, 0x7D, 0xBD, 0xFD, |
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389 | 0x02, 0x42, 0x82, 0xC2, 0x12, 0x52, 0x92, 0xD2, |
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390 | 0x22, 0x62, 0xA2, 0xE2, 0x32, 0x72, 0xB2, 0xF2, |
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391 | 0x06, 0x46, 0x86, 0xC6, 0x16, 0x56, 0x96, 0xD6, |
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392 | 0x26, 0x66, 0xA6, 0xE6, 0x36, 0x76, 0xB6, 0xF6, |
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393 | 0x0A, 0x4A, 0x8A, 0xCA, 0x1A, 0x5A, 0x9A, 0xDA, |
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394 | 0x2A, 0x6A, 0xAA, 0xEA, 0x3A, 0x7A, 0xBA, 0xFA, |
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395 | 0x0E, 0x4E, 0x8E, 0xCE, 0x1E, 0x5E, 0x9E, 0xDE, |
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396 | 0x2E, 0x6E, 0xAE, 0xEE, 0x3E, 0x7E, 0xBE, 0xFE, |
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397 | 0x03, 0x43, 0x83, 0xC3, 0x13, 0x53, 0x93, 0xD3, |
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398 | 0x23, 0x63, 0xA3, 0xE3, 0x33, 0x73, 0xB3, 0xF3, |
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399 | 0x07, 0x47, 0x87, 0xC7, 0x17, 0x57, 0x97, 0xD7, |
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400 | 0x27, 0x67, 0xA7, 0xE7, 0x37, 0x77, 0xB7, 0xF7, |
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401 | 0x0B, 0x4B, 0x8B, 0xCB, 0x1B, 0x5B, 0x9B, 0xDB, |
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402 | 0x2B, 0x6B, 0xAB, 0xEB, 0x3B, 0x7B, 0xBB, 0xFB, |
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403 | 0x0F, 0x4F, 0x8F, 0xCF, 0x1F, 0x5F, 0x9F, 0xDF, |
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404 | 0x2F, 0x6F, 0xAF, 0xEF, 0x3F, 0x7F, 0xBF, 0xFF |
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405 | }; |
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406 | |||
407 | |||
408 | 0x00, 0x10, 0x20, 0x30, 0x40, 0x50, 0x60, 0x70, |
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409 | 0x80, 0x90, 0xA0, 0xB0, 0xC0, 0xD0, 0xE0, 0xF0, |
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410 | 0x01, 0x11, 0x21, 0x31, 0x41, 0x51, 0x61, 0x71, |
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411 | 0x81, 0x91, 0xA1, 0xB1, 0xC1, 0xD1, 0xE1, 0xF1, |
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412 | 0x02, 0x12, 0x22, 0x32, 0x42, 0x52, 0x62, 0x72, |
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413 | 0x82, 0x92, 0xA2, 0xB2, 0xC2, 0xD2, 0xE2, 0xF2, |
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414 | 0x03, 0x13, 0x23, 0x33, 0x43, 0x53, 0x63, 0x73, |
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415 | 0x83, 0x93, 0xA3, 0xB3, 0xC3, 0xD3, 0xE3, 0xF3, |
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416 | 0x04, 0x14, 0x24, 0x34, 0x44, 0x54, 0x64, 0x74, |
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417 | 0x84, 0x94, 0xA4, 0xB4, 0xC4, 0xD4, 0xE4, 0xF4, |
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418 | 0x05, 0x15, 0x25, 0x35, 0x45, 0x55, 0x65, 0x75, |
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419 | 0x85, 0x95, 0xA5, 0xB5, 0xC5, 0xD5, 0xE5, 0xF5, |
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420 | 0x06, 0x16, 0x26, 0x36, 0x46, 0x56, 0x66, 0x76, |
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421 | 0x86, 0x96, 0xA6, 0xB6, 0xC6, 0xD6, 0xE6, 0xF6, |
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422 | 0x07, 0x17, 0x27, 0x37, 0x47, 0x57, 0x67, 0x77, |
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423 | 0x87, 0x97, 0xA7, 0xB7, 0xC7, 0xD7, 0xE7, 0xF7, |
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424 | 0x08, 0x18, 0x28, 0x38, 0x48, 0x58, 0x68, 0x78, |
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425 | 0x88, 0x98, 0xA8, 0xB8, 0xC8, 0xD8, 0xE8, 0xF8, |
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426 | 0x09, 0x19, 0x29, 0x39, 0x49, 0x59, 0x69, 0x79, |
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427 | 0x89, 0x99, 0xA9, 0xB9, 0xC9, 0xD9, 0xE9, 0xF9, |
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428 | 0x0A, 0x1A, 0x2A, 0x3A, 0x4A, 0x5A, 0x6A, 0x7A, |
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429 | 0x8A, 0x9A, 0xAA, 0xBA, 0xCA, 0xDA, 0xEA, 0xFA, |
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430 | 0x0B, 0x1B, 0x2B, 0x3B, 0x4B, 0x5B, 0x6B, 0x7B, |
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431 | 0x8B, 0x9B, 0xAB, 0xBB, 0xCB, 0xDB, 0xEB, 0xFB, |
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432 | 0x0C, 0x1C, 0x2C, 0x3C, 0x4C, 0x5C, 0x6C, 0x7C, |
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433 | 0x8C, 0x9C, 0xAC, 0xBC, 0xCC, 0xDC, 0xEC, 0xFC, |
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434 | 0x0D, 0x1D, 0x2D, 0x3D, 0x4D, 0x5D, 0x6D, 0x7D, |
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435 | 0x8D, 0x9D, 0xAD, 0xBD, 0xCD, 0xDD, 0xED, 0xFD, |
||
436 | 0x0E, 0x1E, 0x2E, 0x3E, 0x4E, 0x5E, 0x6E, 0x7E, |
||
437 | 0x8E, 0x9E, 0xAE, 0xBE, 0xCE, 0xDE, 0xEE, 0xFE, |
||
438 | 0x0F, 0x1F, 0x2F, 0x3F, 0x4F, 0x5F, 0x6F, 0x7F, |
||
439 | 0x8F, 0x9F, 0xAF, 0xBF, 0xCF, 0xDF, 0xEF, 0xFF |
||
440 | }; |
||
441 | |||
442 | |||
443 | void /* PRIVATE */ |
||
444 | png_do_packswap(png_row_infop row_info, png_bytep row) |
||
445 | { |
||
446 | png_debug(1, "in png_do_packswap"); |
||
447 | |||
448 | |||
449 | { |
||
450 | png_bytep rp; |
||
451 | png_const_bytep end, table; |
||
452 | |||
453 | |||
454 | |||
455 | |||
456 | table = onebppswaptable; |
||
457 | |||
458 | |||
459 | table = twobppswaptable; |
||
460 | |||
461 | |||
462 | table = fourbppswaptable; |
||
463 | |||
464 | |||
465 | return; |
||
466 | |||
467 | |||
468 | *rp = table[*rp]; |
||
469 | } |
||
470 | } |
||
471 | #endif /* PNG_READ_PACKSWAP_SUPPORTED or PNG_WRITE_PACKSWAP_SUPPORTED */ |
||
472 | |||
473 | |||
474 | defined(PNG_READ_STRIP_ALPHA_SUPPORTED) |
||
475 | /* Remove a channel - this used to be 'png_do_strip_filler' but it used a |
||
476 | * somewhat weird combination of flags to determine what to do. All the calls |
||
477 | * to png_do_strip_filler are changed in 1.5.2 to call this instead with the |
||
478 | * correct arguments. |
||
479 | * |
||
480 | * The routine isn't general - the channel must be the channel at the start or |
||
481 | * end (not in the middle) of each pixel. |
||
482 | */ |
||
483 | void /* PRIVATE */ |
||
484 | png_do_strip_channel(png_row_infop row_info, png_bytep row, int at_start) |
||
485 | { |
||
486 | png_bytep sp = row; /* source pointer */ |
||
487 | png_bytep dp = row; /* destination pointer */ |
||
488 | png_bytep ep = row + row_info->rowbytes; /* One beyond end of row */ |
||
489 | |||
490 | |||
491 | * it is copied to. ep always points just beyond the end of the row, so |
||
492 | * the loop simply copies (channels-1) channels until sp reaches ep. |
||
493 | * |
||
494 | * at_start: 0 -- convert AG, XG, ARGB, XRGB, AAGG, XXGG, etc. |
||
495 | * nonzero -- convert GA, GX, RGBA, RGBX, GGAA, RRGGBBXX, etc. |
||
496 | */ |
||
497 | |||
498 | |||
499 | if (row_info->channels == 2) |
||
500 | { |
||
501 | if (row_info->bit_depth == 8) |
||
502 | { |
||
503 | if (at_start) /* Skip initial filler */ |
||
504 | ++sp; |
||
505 | else /* Skip initial channel and, for sp, the filler */ |
||
506 | sp += 2, ++dp; |
||
507 | |||
508 | |||
509 | while (sp < ep) |
||
510 | *dp++ = *sp, sp += 2; |
||
511 | |||
512 | |||
513 | } |
||
514 | |||
515 | |||
516 | { |
||
517 | if (at_start) /* Skip initial filler */ |
||
518 | sp += 2; |
||
519 | else /* Skip initial channel and, for sp, the filler */ |
||
520 | sp += 4, dp += 2; |
||
521 | |||
522 | |||
523 | *dp++ = *sp++, *dp++ = *sp, sp += 3; |
||
524 | |||
525 | |||
526 | } |
||
527 | |||
528 | |||
529 | return; /* bad bit depth */ |
||
530 | |||
531 | |||
532 | |||
533 | |||
534 | if (row_info->color_type == PNG_COLOR_TYPE_GRAY_ALPHA) |
||
535 | row_info->color_type = PNG_COLOR_TYPE_GRAY; |
||
536 | } |
||
537 | |||
538 | |||
539 | else if (row_info->channels == 4) |
||
540 | { |
||
541 | if (row_info->bit_depth == 8) |
||
542 | { |
||
543 | if (at_start) /* Skip initial filler */ |
||
544 | ++sp; |
||
545 | else /* Skip initial channels and, for sp, the filler */ |
||
546 | sp += 4, dp += 3; |
||
547 | |||
548 | |||
549 | while (sp < ep) |
||
550 | *dp++ = *sp++, *dp++ = *sp++, *dp++ = *sp, sp += 2; |
||
551 | |||
552 | |||
553 | } |
||
554 | |||
555 | |||
556 | { |
||
557 | if (at_start) /* Skip initial filler */ |
||
558 | sp += 2; |
||
559 | else /* Skip initial channels and, for sp, the filler */ |
||
560 | sp += 8, dp += 6; |
||
561 | |||
562 | |||
563 | { |
||
564 | /* Copy 6 bytes, skip 2 */ |
||
565 | *dp++ = *sp++, *dp++ = *sp++; |
||
566 | *dp++ = *sp++, *dp++ = *sp++; |
||
567 | *dp++ = *sp++, *dp++ = *sp, sp += 3; |
||
568 | } |
||
569 | |||
570 | |||
571 | } |
||
572 | |||
573 | |||
574 | return; /* bad bit depth */ |
||
575 | |||
576 | |||
577 | |||
578 | |||
579 | if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA) |
||
580 | row_info->color_type = PNG_COLOR_TYPE_RGB; |
||
581 | } |
||
582 | |||
583 | |||
584 | return; /* The filler channel has gone already */ |
||
585 | |||
586 | |||
587 | row_info->rowbytes = dp-row; |
||
588 | } |
||
589 | #endif |
||
590 | |||
591 | |||
592 | /* Swaps red and blue bytes within a pixel */ |
||
593 | void /* PRIVATE */ |
||
594 | png_do_bgr(png_row_infop row_info, png_bytep row) |
||
595 | { |
||
596 | png_debug(1, "in png_do_bgr"); |
||
597 | |||
598 | |||
599 | { |
||
600 | png_uint_32 row_width = row_info->width; |
||
601 | if (row_info->bit_depth == 8) |
||
602 | { |
||
603 | if (row_info->color_type == PNG_COLOR_TYPE_RGB) |
||
604 | { |
||
605 | png_bytep rp; |
||
606 | png_uint_32 i; |
||
607 | |||
608 | |||
609 | { |
||
610 | png_byte save = *rp; |
||
611 | *rp = *(rp + 2); |
||
612 | *(rp + 2) = save; |
||
613 | } |
||
614 | } |
||
615 | |||
616 | |||
617 | { |
||
618 | png_bytep rp; |
||
619 | png_uint_32 i; |
||
620 | |||
621 | |||
622 | { |
||
623 | png_byte save = *rp; |
||
624 | *rp = *(rp + 2); |
||
625 | *(rp + 2) = save; |
||
626 | } |
||
627 | } |
||
628 | } |
||
629 | |||
630 | |||
631 | else if (row_info->bit_depth == 16) |
||
632 | { |
||
633 | if (row_info->color_type == PNG_COLOR_TYPE_RGB) |
||
634 | { |
||
635 | png_bytep rp; |
||
636 | png_uint_32 i; |
||
637 | |||
638 | |||
639 | { |
||
640 | png_byte save = *rp; |
||
641 | *rp = *(rp + 4); |
||
642 | *(rp + 4) = save; |
||
643 | save = *(rp + 1); |
||
644 | *(rp + 1) = *(rp + 5); |
||
645 | *(rp + 5) = save; |
||
646 | } |
||
647 | } |
||
648 | |||
649 | |||
650 | { |
||
651 | png_bytep rp; |
||
652 | png_uint_32 i; |
||
653 | |||
654 | |||
655 | { |
||
656 | png_byte save = *rp; |
||
657 | *rp = *(rp + 4); |
||
658 | *(rp + 4) = save; |
||
659 | save = *(rp + 1); |
||
660 | *(rp + 1) = *(rp + 5); |
||
661 | *(rp + 5) = save; |
||
662 | } |
||
663 | } |
||
664 | } |
||
665 | #endif |
||
666 | } |
||
667 | } |
||
668 | #endif /* PNG_READ_BGR_SUPPORTED or PNG_WRITE_BGR_SUPPORTED */ |
||
669 | |||
670 | |||
671 | defined(PNG_WRITE_CHECK_FOR_INVALID_INDEX_SUPPORTED) |
||
672 | /* Added at libpng-1.5.10 */ |
||
673 | void /* PRIVATE */ |
||
674 | png_do_check_palette_indexes(png_structrp png_ptr, png_row_infop row_info) |
||
675 | { |
||
676 | if (png_ptr->num_palette < (1 << row_info->bit_depth) && |
||
677 | png_ptr->num_palette > 0) /* num_palette can be 0 in MNG files */ |
||
678 | { |
||
679 | /* Calculations moved outside switch in an attempt to stop different |
||
680 | * compiler warnings. 'padding' is in *bits* within the last byte, it is |
||
681 | * an 'int' because pixel_depth becomes an 'int' in the expression below, |
||
682 | * and this calculation is used because it avoids warnings that other |
||
683 | * forms produced on either GCC or MSVC. |
||
684 | */ |
||
685 | int padding = (-row_info->pixel_depth * row_info->width) & 7; |
||
686 | png_bytep rp = png_ptr->row_buf + row_info->rowbytes; |
||
687 | |||
688 | |||
689 | { |
||
690 | case 1: |
||
691 | { |
||
692 | /* in this case, all bytes must be 0 so we don't need |
||
693 | * to unpack the pixels except for the rightmost one. |
||
694 | */ |
||
695 | for (; rp > png_ptr->row_buf; rp--) |
||
696 | { |
||
697 | if (*rp >> padding != 0) |
||
698 | png_ptr->num_palette_max = 1; |
||
699 | padding = 0; |
||
700 | } |
||
701 | |||
702 | |||
703 | } |
||
704 | |||
705 | |||
706 | { |
||
707 | for (; rp > png_ptr->row_buf; rp--) |
||
708 | { |
||
709 | int i = ((*rp >> padding) & 0x03); |
||
710 | |||
711 | |||
712 | png_ptr->num_palette_max = i; |
||
713 | |||
714 | |||
715 | |||
716 | |||
717 | png_ptr->num_palette_max = i; |
||
718 | |||
719 | |||
720 | |||
721 | |||
722 | png_ptr->num_palette_max = i; |
||
723 | |||
724 | |||
725 | |||
726 | |||
727 | png_ptr->num_palette_max = i; |
||
728 | |||
729 | |||
730 | } |
||
731 | |||
732 | |||
733 | } |
||
734 | |||
735 | |||
736 | { |
||
737 | for (; rp > png_ptr->row_buf; rp--) |
||
738 | { |
||
739 | int i = ((*rp >> padding) & 0x0f); |
||
740 | |||
741 | |||
742 | png_ptr->num_palette_max = i; |
||
743 | |||
744 | |||
745 | |||
746 | |||
747 | png_ptr->num_palette_max = i; |
||
748 | |||
749 | |||
750 | } |
||
751 | |||
752 | |||
753 | } |
||
754 | |||
755 | |||
756 | { |
||
757 | for (; rp > png_ptr->row_buf; rp--) |
||
758 | { |
||
759 | if (*rp > png_ptr->num_palette_max) |
||
760 | png_ptr->num_palette_max = (int) *rp; |
||
761 | } |
||
762 | |||
763 | |||
764 | } |
||
765 | |||
766 | |||
767 | break; |
||
768 | } |
||
769 | } |
||
770 | } |
||
771 | #endif /* PNG_CHECK_FOR_INVALID_INDEX_SUPPORTED */ |
||
772 | |||
773 | |||
774 | defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) |
||
775 | #ifdef PNG_USER_TRANSFORM_PTR_SUPPORTED |
||
776 | void PNGAPI |
||
777 | png_set_user_transform_info(png_structrp png_ptr, png_voidp |
||
778 | user_transform_ptr, int user_transform_depth, int user_transform_channels) |
||
779 | { |
||
780 | png_debug(1, "in png_set_user_transform_info"); |
||
781 | |||
782 | |||
783 | return; |
||
784 | |||
785 | |||
786 | if ((png_ptr->mode & PNG_IS_READ_STRUCT) != 0 && |
||
787 | (png_ptr->flags & PNG_FLAG_ROW_INIT) != 0) |
||
788 | { |
||
789 | png_app_error(png_ptr, |
||
790 | "info change after png_start_read_image or png_read_update_info"); |
||
791 | return; |
||
792 | } |
||
793 | #endif |
||
794 | |||
795 | |||
796 | png_ptr->user_transform_depth = (png_byte)user_transform_depth; |
||
797 | png_ptr->user_transform_channels = (png_byte)user_transform_channels; |
||
798 | } |
||
799 | #endif |
||
800 | |||
801 | |||
802 | * the user transform functions. The application should free any memory |
||
803 | * associated with this pointer before png_write_destroy and png_read_destroy |
||
804 | * are called. |
||
805 | */ |
||
806 | #ifdef PNG_USER_TRANSFORM_PTR_SUPPORTED |
||
807 | png_voidp PNGAPI |
||
808 | png_get_user_transform_ptr(png_const_structrp png_ptr) |
||
809 | { |
||
810 | if (png_ptr == NULL) |
||
811 | return (NULL); |
||
812 | |||
813 | |||
814 | } |
||
815 | #endif |
||
816 | |||
817 | |||
818 | png_uint_32 PNGAPI |
||
819 | png_get_current_row_number(png_const_structrp png_ptr) |
||
820 | { |
||
821 | /* See the comments in png.h - this is the sub-image row when reading and |
||
822 | * interlaced image. |
||
823 | */ |
||
824 | if (png_ptr != NULL) |
||
825 | return png_ptr->row_number; |
||
826 | |||
827 | |||
828 | } |
||
829 | |||
830 | |||
831 | png_get_current_pass_number(png_const_structrp png_ptr) |
||
832 | { |
||
833 | if (png_ptr != NULL) |
||
834 | return png_ptr->pass; |
||
835 | return 8; /* invalid */ |
||
836 | } |
||
837 | #endif /* PNG_USER_TRANSFORM_INFO_SUPPORTED */ |
||
838 | #endif /* PNG_READ_USER_TRANSFORM_SUPPORTED || |
||
839 | PNG_WRITE_USER_TRANSFORM_SUPPORTED */ |
||
840 | #endif /* PNG_READ_SUPPORTED || PNG_WRITE_SUPPORTED */><>>>>>>>>>>>>>>>>>> |
||
841 |