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Rev | Author | Line No. | Line |
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1897 | serge | 1 | |
2 | * |
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3 | * Last changed in libpng 1.5.1 [February 3, 2011] |
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4 | * Copyright (c) 1998-2011 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_structp 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_structp 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_structp 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_structp 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_structp 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_structp 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_structp 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 | png_ptr->filler = (png_uint_16)filler; |
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126 | |||
127 | |||
128 | png_ptr->flags |= PNG_FLAG_FILLER_AFTER; |
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129 | |||
130 | |||
131 | png_ptr->flags &= ~PNG_FLAG_FILLER_AFTER; |
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132 | |||
133 | |||
134 | * I attempted to do that in libpng-1.0.1a but that caused problems |
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135 | * so I restored it in libpng-1.0.2a |
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136 | */ |
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137 | |||
138 | |||
139 | { |
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140 | png_ptr->usr_channels = 4; |
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141 | } |
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142 | |||
143 | |||
144 | * a less-than-8-bit grayscale to GA?) */ |
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145 | |||
146 | |||
147 | { |
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148 | png_ptr->usr_channels = 2; |
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149 | } |
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150 | } |
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151 | |||
152 | |||
153 | void PNGAPI |
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154 | png_set_add_alpha(png_structp png_ptr, png_uint_32 filler, int filler_loc) |
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155 | { |
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156 | png_debug(1, "in png_set_add_alpha"); |
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157 | |||
158 | |||
159 | return; |
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160 | |||
161 | |||
162 | png_ptr->transformations |= PNG_ADD_ALPHA; |
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163 | } |
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164 | |||
165 | |||
166 | |||
167 | |||
168 | defined(PNG_WRITE_SWAP_ALPHA_SUPPORTED) |
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169 | void PNGAPI |
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170 | png_set_swap_alpha(png_structp png_ptr) |
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171 | { |
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172 | png_debug(1, "in png_set_swap_alpha"); |
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173 | |||
174 | |||
175 | return; |
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176 | |||
177 | |||
178 | } |
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179 | #endif |
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180 | |||
181 | |||
182 | defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED) |
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183 | void PNGAPI |
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184 | png_set_invert_alpha(png_structp png_ptr) |
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185 | { |
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186 | png_debug(1, "in png_set_invert_alpha"); |
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187 | |||
188 | |||
189 | return; |
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190 | |||
191 | |||
192 | } |
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193 | #endif |
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194 | |||
195 | |||
196 | void PNGAPI |
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197 | png_set_invert_mono(png_structp png_ptr) |
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198 | { |
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199 | png_debug(1, "in png_set_invert_mono"); |
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200 | |||
201 | |||
202 | return; |
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203 | |||
204 | |||
205 | } |
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206 | |||
207 | |||
208 | void /* PRIVATE */ |
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209 | png_do_invert(png_row_infop row_info, png_bytep row) |
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210 | { |
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211 | png_debug(1, "in png_do_invert"); |
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212 | |||
213 | |||
214 | * if (row_info->bit_depth == 1 && |
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215 | */ |
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216 | if (row_info->color_type == PNG_COLOR_TYPE_GRAY) |
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217 | { |
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218 | png_bytep rp = row; |
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219 | png_size_t i; |
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220 | png_size_t istop = row_info->rowbytes; |
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221 | |||
222 | |||
223 | { |
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224 | *rp = (png_byte)(~(*rp)); |
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225 | rp++; |
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226 | } |
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227 | } |
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228 | |||
229 | |||
230 | row_info->bit_depth == 8) |
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231 | { |
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232 | png_bytep rp = row; |
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233 | png_size_t i; |
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234 | png_size_t istop = row_info->rowbytes; |
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235 | |||
236 | |||
237 | { |
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238 | *rp = (png_byte)(~(*rp)); |
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239 | rp += 2; |
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240 | } |
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241 | } |
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242 | |||
243 | |||
244 | else if (row_info->color_type == PNG_COLOR_TYPE_GRAY_ALPHA && |
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245 | row_info->bit_depth == 16) |
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246 | { |
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247 | png_bytep rp = row; |
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248 | png_size_t i; |
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249 | png_size_t istop = row_info->rowbytes; |
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250 | |||
251 | |||
252 | { |
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253 | *rp = (png_byte)(~(*rp)); |
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254 | *(rp + 1) = (png_byte)(~(*(rp + 1))); |
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255 | rp += 4; |
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256 | } |
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257 | } |
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258 | #endif |
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259 | } |
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260 | #endif |
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261 | |||
262 | |||
263 | #if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED) |
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264 | /* Swaps byte order on 16 bit depth images */ |
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265 | void /* PRIVATE */ |
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266 | png_do_swap(png_row_infop row_info, png_bytep row) |
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267 | { |
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268 | png_debug(1, "in png_do_swap"); |
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269 | |||
270 | |||
271 | { |
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272 | png_bytep rp = row; |
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273 | png_uint_32 i; |
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274 | png_uint_32 istop= row_info->width * row_info->channels; |
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275 | |||
276 | |||
277 | { |
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278 | png_byte t = *rp; |
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279 | *rp = *(rp + 1); |
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280 | *(rp + 1) = t; |
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281 | } |
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282 | } |
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283 | } |
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284 | #endif |
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285 | #endif |
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286 | |||
287 | |||
288 | static PNG_CONST png_byte onebppswaptable[256] = { |
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289 | 0x00, 0x80, 0x40, 0xC0, 0x20, 0xA0, 0x60, 0xE0, |
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290 | 0x10, 0x90, 0x50, 0xD0, 0x30, 0xB0, 0x70, 0xF0, |
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291 | 0x08, 0x88, 0x48, 0xC8, 0x28, 0xA8, 0x68, 0xE8, |
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292 | 0x18, 0x98, 0x58, 0xD8, 0x38, 0xB8, 0x78, 0xF8, |
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293 | 0x04, 0x84, 0x44, 0xC4, 0x24, 0xA4, 0x64, 0xE4, |
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294 | 0x14, 0x94, 0x54, 0xD4, 0x34, 0xB4, 0x74, 0xF4, |
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295 | 0x0C, 0x8C, 0x4C, 0xCC, 0x2C, 0xAC, 0x6C, 0xEC, |
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296 | 0x1C, 0x9C, 0x5C, 0xDC, 0x3C, 0xBC, 0x7C, 0xFC, |
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297 | 0x02, 0x82, 0x42, 0xC2, 0x22, 0xA2, 0x62, 0xE2, |
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298 | 0x12, 0x92, 0x52, 0xD2, 0x32, 0xB2, 0x72, 0xF2, |
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299 | 0x0A, 0x8A, 0x4A, 0xCA, 0x2A, 0xAA, 0x6A, 0xEA, |
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300 | 0x1A, 0x9A, 0x5A, 0xDA, 0x3A, 0xBA, 0x7A, 0xFA, |
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301 | 0x06, 0x86, 0x46, 0xC6, 0x26, 0xA6, 0x66, 0xE6, |
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302 | 0x16, 0x96, 0x56, 0xD6, 0x36, 0xB6, 0x76, 0xF6, |
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303 | 0x0E, 0x8E, 0x4E, 0xCE, 0x2E, 0xAE, 0x6E, 0xEE, |
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304 | 0x1E, 0x9E, 0x5E, 0xDE, 0x3E, 0xBE, 0x7E, 0xFE, |
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305 | 0x01, 0x81, 0x41, 0xC1, 0x21, 0xA1, 0x61, 0xE1, |
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306 | 0x11, 0x91, 0x51, 0xD1, 0x31, 0xB1, 0x71, 0xF1, |
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307 | 0x09, 0x89, 0x49, 0xC9, 0x29, 0xA9, 0x69, 0xE9, |
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308 | 0x19, 0x99, 0x59, 0xD9, 0x39, 0xB9, 0x79, 0xF9, |
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309 | 0x05, 0x85, 0x45, 0xC5, 0x25, 0xA5, 0x65, 0xE5, |
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310 | 0x15, 0x95, 0x55, 0xD5, 0x35, 0xB5, 0x75, 0xF5, |
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311 | 0x0D, 0x8D, 0x4D, 0xCD, 0x2D, 0xAD, 0x6D, 0xED, |
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312 | 0x1D, 0x9D, 0x5D, 0xDD, 0x3D, 0xBD, 0x7D, 0xFD, |
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313 | 0x03, 0x83, 0x43, 0xC3, 0x23, 0xA3, 0x63, 0xE3, |
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314 | 0x13, 0x93, 0x53, 0xD3, 0x33, 0xB3, 0x73, 0xF3, |
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315 | 0x0B, 0x8B, 0x4B, 0xCB, 0x2B, 0xAB, 0x6B, 0xEB, |
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316 | 0x1B, 0x9B, 0x5B, 0xDB, 0x3B, 0xBB, 0x7B, 0xFB, |
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317 | 0x07, 0x87, 0x47, 0xC7, 0x27, 0xA7, 0x67, 0xE7, |
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318 | 0x17, 0x97, 0x57, 0xD7, 0x37, 0xB7, 0x77, 0xF7, |
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319 | 0x0F, 0x8F, 0x4F, 0xCF, 0x2F, 0xAF, 0x6F, 0xEF, |
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320 | 0x1F, 0x9F, 0x5F, 0xDF, 0x3F, 0xBF, 0x7F, 0xFF |
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321 | }; |
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322 | |||
323 | |||
324 | 0x00, 0x40, 0x80, 0xC0, 0x10, 0x50, 0x90, 0xD0, |
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325 | 0x20, 0x60, 0xA0, 0xE0, 0x30, 0x70, 0xB0, 0xF0, |
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326 | 0x04, 0x44, 0x84, 0xC4, 0x14, 0x54, 0x94, 0xD4, |
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327 | 0x24, 0x64, 0xA4, 0xE4, 0x34, 0x74, 0xB4, 0xF4, |
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328 | 0x08, 0x48, 0x88, 0xC8, 0x18, 0x58, 0x98, 0xD8, |
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329 | 0x28, 0x68, 0xA8, 0xE8, 0x38, 0x78, 0xB8, 0xF8, |
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330 | 0x0C, 0x4C, 0x8C, 0xCC, 0x1C, 0x5C, 0x9C, 0xDC, |
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331 | 0x2C, 0x6C, 0xAC, 0xEC, 0x3C, 0x7C, 0xBC, 0xFC, |
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332 | 0x01, 0x41, 0x81, 0xC1, 0x11, 0x51, 0x91, 0xD1, |
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333 | 0x21, 0x61, 0xA1, 0xE1, 0x31, 0x71, 0xB1, 0xF1, |
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334 | 0x05, 0x45, 0x85, 0xC5, 0x15, 0x55, 0x95, 0xD5, |
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335 | 0x25, 0x65, 0xA5, 0xE5, 0x35, 0x75, 0xB5, 0xF5, |
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336 | 0x09, 0x49, 0x89, 0xC9, 0x19, 0x59, 0x99, 0xD9, |
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337 | 0x29, 0x69, 0xA9, 0xE9, 0x39, 0x79, 0xB9, 0xF9, |
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338 | 0x0D, 0x4D, 0x8D, 0xCD, 0x1D, 0x5D, 0x9D, 0xDD, |
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339 | 0x2D, 0x6D, 0xAD, 0xED, 0x3D, 0x7D, 0xBD, 0xFD, |
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340 | 0x02, 0x42, 0x82, 0xC2, 0x12, 0x52, 0x92, 0xD2, |
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341 | 0x22, 0x62, 0xA2, 0xE2, 0x32, 0x72, 0xB2, 0xF2, |
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342 | 0x06, 0x46, 0x86, 0xC6, 0x16, 0x56, 0x96, 0xD6, |
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343 | 0x26, 0x66, 0xA6, 0xE6, 0x36, 0x76, 0xB6, 0xF6, |
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344 | 0x0A, 0x4A, 0x8A, 0xCA, 0x1A, 0x5A, 0x9A, 0xDA, |
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345 | 0x2A, 0x6A, 0xAA, 0xEA, 0x3A, 0x7A, 0xBA, 0xFA, |
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346 | 0x0E, 0x4E, 0x8E, 0xCE, 0x1E, 0x5E, 0x9E, 0xDE, |
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347 | 0x2E, 0x6E, 0xAE, 0xEE, 0x3E, 0x7E, 0xBE, 0xFE, |
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348 | 0x03, 0x43, 0x83, 0xC3, 0x13, 0x53, 0x93, 0xD3, |
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349 | 0x23, 0x63, 0xA3, 0xE3, 0x33, 0x73, 0xB3, 0xF3, |
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350 | 0x07, 0x47, 0x87, 0xC7, 0x17, 0x57, 0x97, 0xD7, |
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351 | 0x27, 0x67, 0xA7, 0xE7, 0x37, 0x77, 0xB7, 0xF7, |
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352 | 0x0B, 0x4B, 0x8B, 0xCB, 0x1B, 0x5B, 0x9B, 0xDB, |
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353 | 0x2B, 0x6B, 0xAB, 0xEB, 0x3B, 0x7B, 0xBB, 0xFB, |
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354 | 0x0F, 0x4F, 0x8F, 0xCF, 0x1F, 0x5F, 0x9F, 0xDF, |
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355 | 0x2F, 0x6F, 0xAF, 0xEF, 0x3F, 0x7F, 0xBF, 0xFF |
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356 | }; |
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357 | |||
358 | |||
359 | 0x00, 0x10, 0x20, 0x30, 0x40, 0x50, 0x60, 0x70, |
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360 | 0x80, 0x90, 0xA0, 0xB0, 0xC0, 0xD0, 0xE0, 0xF0, |
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361 | 0x01, 0x11, 0x21, 0x31, 0x41, 0x51, 0x61, 0x71, |
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362 | 0x81, 0x91, 0xA1, 0xB1, 0xC1, 0xD1, 0xE1, 0xF1, |
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363 | 0x02, 0x12, 0x22, 0x32, 0x42, 0x52, 0x62, 0x72, |
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364 | 0x82, 0x92, 0xA2, 0xB2, 0xC2, 0xD2, 0xE2, 0xF2, |
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365 | 0x03, 0x13, 0x23, 0x33, 0x43, 0x53, 0x63, 0x73, |
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366 | 0x83, 0x93, 0xA3, 0xB3, 0xC3, 0xD3, 0xE3, 0xF3, |
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367 | 0x04, 0x14, 0x24, 0x34, 0x44, 0x54, 0x64, 0x74, |
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368 | 0x84, 0x94, 0xA4, 0xB4, 0xC4, 0xD4, 0xE4, 0xF4, |
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369 | 0x05, 0x15, 0x25, 0x35, 0x45, 0x55, 0x65, 0x75, |
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370 | 0x85, 0x95, 0xA5, 0xB5, 0xC5, 0xD5, 0xE5, 0xF5, |
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371 | 0x06, 0x16, 0x26, 0x36, 0x46, 0x56, 0x66, 0x76, |
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372 | 0x86, 0x96, 0xA6, 0xB6, 0xC6, 0xD6, 0xE6, 0xF6, |
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373 | 0x07, 0x17, 0x27, 0x37, 0x47, 0x57, 0x67, 0x77, |
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374 | 0x87, 0x97, 0xA7, 0xB7, 0xC7, 0xD7, 0xE7, 0xF7, |
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375 | 0x08, 0x18, 0x28, 0x38, 0x48, 0x58, 0x68, 0x78, |
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376 | 0x88, 0x98, 0xA8, 0xB8, 0xC8, 0xD8, 0xE8, 0xF8, |
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377 | 0x09, 0x19, 0x29, 0x39, 0x49, 0x59, 0x69, 0x79, |
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378 | 0x89, 0x99, 0xA9, 0xB9, 0xC9, 0xD9, 0xE9, 0xF9, |
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379 | 0x0A, 0x1A, 0x2A, 0x3A, 0x4A, 0x5A, 0x6A, 0x7A, |
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380 | 0x8A, 0x9A, 0xAA, 0xBA, 0xCA, 0xDA, 0xEA, 0xFA, |
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381 | 0x0B, 0x1B, 0x2B, 0x3B, 0x4B, 0x5B, 0x6B, 0x7B, |
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382 | 0x8B, 0x9B, 0xAB, 0xBB, 0xCB, 0xDB, 0xEB, 0xFB, |
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383 | 0x0C, 0x1C, 0x2C, 0x3C, 0x4C, 0x5C, 0x6C, 0x7C, |
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384 | 0x8C, 0x9C, 0xAC, 0xBC, 0xCC, 0xDC, 0xEC, 0xFC, |
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385 | 0x0D, 0x1D, 0x2D, 0x3D, 0x4D, 0x5D, 0x6D, 0x7D, |
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386 | 0x8D, 0x9D, 0xAD, 0xBD, 0xCD, 0xDD, 0xED, 0xFD, |
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387 | 0x0E, 0x1E, 0x2E, 0x3E, 0x4E, 0x5E, 0x6E, 0x7E, |
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388 | 0x8E, 0x9E, 0xAE, 0xBE, 0xCE, 0xDE, 0xEE, 0xFE, |
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389 | 0x0F, 0x1F, 0x2F, 0x3F, 0x4F, 0x5F, 0x6F, 0x7F, |
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390 | 0x8F, 0x9F, 0xAF, 0xBF, 0xCF, 0xDF, 0xEF, 0xFF |
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391 | }; |
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392 | |||
393 | |||
394 | void /* PRIVATE */ |
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395 | png_do_packswap(png_row_infop row_info, png_bytep row) |
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396 | { |
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397 | png_debug(1, "in png_do_packswap"); |
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398 | |||
399 | |||
400 | { |
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401 | png_bytep rp; |
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402 | png_const_bytep end, table; |
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403 | |||
404 | |||
405 | |||
406 | |||
407 | table = onebppswaptable; |
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408 | |||
409 | |||
410 | table = twobppswaptable; |
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411 | |||
412 | |||
413 | table = fourbppswaptable; |
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414 | |||
415 | |||
416 | return; |
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417 | |||
418 | |||
419 | *rp = table[*rp]; |
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420 | } |
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421 | } |
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422 | #endif /* PNG_READ_PACKSWAP_SUPPORTED or PNG_WRITE_PACKSWAP_SUPPORTED */ |
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423 | |||
424 | |||
425 | defined(PNG_READ_STRIP_ALPHA_SUPPORTED) |
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426 | /* Remove filler or alpha byte(s) */ |
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427 | void /* PRIVATE */ |
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428 | png_do_strip_filler(png_row_infop row_info, png_bytep row, png_uint_32 flags) |
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429 | { |
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430 | png_debug(1, "in png_do_strip_filler"); |
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431 | |||
432 | |||
433 | png_bytep sp = row; |
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434 | png_bytep dp = row; |
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435 | png_uint_32 row_width = row_info->width; |
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436 | png_uint_32 i; |
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437 | |||
438 | |||
439 | (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA && |
||
440 | (flags & PNG_FLAG_STRIP_ALPHA))) && |
||
441 | row_info->channels == 4) |
||
442 | { |
||
443 | if (row_info->bit_depth == 8) |
||
444 | { |
||
445 | /* This converts from RGBX or RGBA to RGB */ |
||
446 | if (flags & PNG_FLAG_FILLER_AFTER) |
||
447 | { |
||
448 | dp += 3; sp += 4; |
||
449 | for (i = 1; i < row_width; i++) |
||
450 | { |
||
451 | *dp++ = *sp++; |
||
452 | *dp++ = *sp++; |
||
453 | *dp++ = *sp++; |
||
454 | sp++; |
||
455 | } |
||
456 | } |
||
457 | |||
458 | |||
459 | else |
||
460 | { |
||
461 | for (i = 0; i < row_width; i++) |
||
462 | { |
||
463 | sp++; |
||
464 | *dp++ = *sp++; |
||
465 | *dp++ = *sp++; |
||
466 | *dp++ = *sp++; |
||
467 | } |
||
468 | } |
||
469 | row_info->pixel_depth = 24; |
||
470 | row_info->rowbytes = row_width * 3; |
||
471 | } |
||
472 | |||
473 | |||
474 | { |
||
475 | if (flags & PNG_FLAG_FILLER_AFTER) |
||
476 | { |
||
477 | /* This converts from RRGGBBXX or RRGGBBAA to RRGGBB */ |
||
478 | sp += 8; dp += 6; |
||
479 | for (i = 1; i < row_width; i++) |
||
480 | { |
||
481 | /* This could be (although png_memcpy is probably slower): |
||
482 | png_memcpy(dp, sp, 6); |
||
483 | sp += 8; |
||
484 | dp += 6; |
||
485 | */ |
||
486 | |||
487 | |||
488 | *dp++ = *sp++; |
||
489 | *dp++ = *sp++; |
||
490 | *dp++ = *sp++; |
||
491 | *dp++ = *sp++; |
||
492 | *dp++ = *sp++; |
||
493 | sp += 2; |
||
494 | } |
||
495 | } |
||
496 | |||
497 | |||
498 | { |
||
499 | /* This converts from XXRRGGBB or AARRGGBB to RRGGBB */ |
||
500 | for (i = 0; i < row_width; i++) |
||
501 | { |
||
502 | /* This could be (although png_memcpy is probably slower): |
||
503 | png_memcpy(dp, sp, 6); |
||
504 | sp += 8; |
||
505 | dp += 6; |
||
506 | */ |
||
507 | |||
508 | |||
509 | *dp++ = *sp++; |
||
510 | *dp++ = *sp++; |
||
511 | *dp++ = *sp++; |
||
512 | *dp++ = *sp++; |
||
513 | *dp++ = *sp++; |
||
514 | *dp++ = *sp++; |
||
515 | } |
||
516 | } |
||
517 | |||
518 | |||
519 | row_info->rowbytes = row_width * 6; |
||
520 | } |
||
521 | row_info->channels = 3; |
||
522 | } |
||
523 | |||
524 | |||
525 | (row_info->color_type == PNG_COLOR_TYPE_GRAY_ALPHA && |
||
526 | (flags & PNG_FLAG_STRIP_ALPHA))) && |
||
527 | row_info->channels == 2) |
||
528 | { |
||
529 | if (row_info->bit_depth == 8) |
||
530 | { |
||
531 | if (flags & PNG_FLAG_FILLER_AFTER) |
||
532 | { |
||
533 | /* This converts from GX or GA to G */ |
||
534 | for (i = 0; i < row_width; i++) |
||
535 | { |
||
536 | *dp++ = *sp++; |
||
537 | sp++; |
||
538 | } |
||
539 | } |
||
540 | |||
541 | |||
542 | { |
||
543 | /* This converts from XG or AG to G */ |
||
544 | for (i = 0; i < row_width; i++) |
||
545 | { |
||
546 | sp++; |
||
547 | *dp++ = *sp++; |
||
548 | } |
||
549 | } |
||
550 | |||
551 | |||
552 | row_info->rowbytes = row_width; |
||
553 | } |
||
554 | |||
555 | |||
556 | { |
||
557 | if (flags & PNG_FLAG_FILLER_AFTER) |
||
558 | { |
||
559 | /* This converts from GGXX or GGAA to GG */ |
||
560 | sp += 4; dp += 2; |
||
561 | for (i = 1; i < row_width; i++) |
||
562 | { |
||
563 | *dp++ = *sp++; |
||
564 | *dp++ = *sp++; |
||
565 | sp += 2; |
||
566 | } |
||
567 | } |
||
568 | |||
569 | |||
570 | { |
||
571 | /* This converts from XXGG or AAGG to GG */ |
||
572 | for (i = 0; i < row_width; i++) |
||
573 | { |
||
574 | sp += 2; |
||
575 | *dp++ = *sp++; |
||
576 | *dp++ = *sp++; |
||
577 | } |
||
578 | } |
||
579 | |||
580 | |||
581 | row_info->rowbytes = row_width * 2; |
||
582 | } |
||
583 | row_info->channels = 1; |
||
584 | } |
||
585 | |||
586 | |||
587 | row_info->color_type = (png_byte)(row_info->color_type & |
||
588 | ~PNG_COLOR_MASK_ALPHA); |
||
589 | } |
||
590 | } |
||
591 | #endif |
||
592 | |||
593 | |||
594 | /* Swaps red and blue bytes within a pixel */ |
||
595 | void /* PRIVATE */ |
||
596 | png_do_bgr(png_row_infop row_info, png_bytep row) |
||
597 | { |
||
598 | png_debug(1, "in png_do_bgr"); |
||
599 | |||
600 | |||
601 | { |
||
602 | png_uint_32 row_width = row_info->width; |
||
603 | if (row_info->bit_depth == 8) |
||
604 | { |
||
605 | if (row_info->color_type == PNG_COLOR_TYPE_RGB) |
||
606 | { |
||
607 | png_bytep rp; |
||
608 | png_uint_32 i; |
||
609 | |||
610 | |||
611 | { |
||
612 | png_byte save = *rp; |
||
613 | *rp = *(rp + 2); |
||
614 | *(rp + 2) = save; |
||
615 | } |
||
616 | } |
||
617 | |||
618 | |||
619 | { |
||
620 | png_bytep rp; |
||
621 | png_uint_32 i; |
||
622 | |||
623 | |||
624 | { |
||
625 | png_byte save = *rp; |
||
626 | *rp = *(rp + 2); |
||
627 | *(rp + 2) = save; |
||
628 | } |
||
629 | } |
||
630 | } |
||
631 | |||
632 | |||
633 | else if (row_info->bit_depth == 16) |
||
634 | { |
||
635 | if (row_info->color_type == PNG_COLOR_TYPE_RGB) |
||
636 | { |
||
637 | png_bytep rp; |
||
638 | png_uint_32 i; |
||
639 | |||
640 | |||
641 | { |
||
642 | png_byte save = *rp; |
||
643 | *rp = *(rp + 4); |
||
644 | *(rp + 4) = save; |
||
645 | save = *(rp + 1); |
||
646 | *(rp + 1) = *(rp + 5); |
||
647 | *(rp + 5) = save; |
||
648 | } |
||
649 | } |
||
650 | |||
651 | |||
652 | { |
||
653 | png_bytep rp; |
||
654 | png_uint_32 i; |
||
655 | |||
656 | |||
657 | { |
||
658 | png_byte save = *rp; |
||
659 | *rp = *(rp + 4); |
||
660 | *(rp + 4) = save; |
||
661 | save = *(rp + 1); |
||
662 | *(rp + 1) = *(rp + 5); |
||
663 | *(rp + 5) = save; |
||
664 | } |
||
665 | } |
||
666 | } |
||
667 | #endif |
||
668 | } |
||
669 | } |
||
670 | #endif /* PNG_READ_BGR_SUPPORTED or PNG_WRITE_BGR_SUPPORTED */ |
||
671 | |||
672 | |||
673 | defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) |
||
674 | #ifdef PNG_USER_TRANSFORM_PTR_SUPPORTED |
||
675 | void PNGAPI |
||
676 | png_set_user_transform_info(png_structp png_ptr, png_voidp |
||
677 | user_transform_ptr, int user_transform_depth, int user_transform_channels) |
||
678 | { |
||
679 | png_debug(1, "in png_set_user_transform_info"); |
||
680 | |||
681 | |||
682 | return; |
||
683 | png_ptr->user_transform_ptr = user_transform_ptr; |
||
684 | png_ptr->user_transform_depth = (png_byte)user_transform_depth; |
||
685 | png_ptr->user_transform_channels = (png_byte)user_transform_channels; |
||
686 | } |
||
687 | #endif |
||
688 | |||
689 | |||
690 | * the user transform functions. The application should free any memory |
||
691 | * associated with this pointer before png_write_destroy and png_read_destroy |
||
692 | * are called. |
||
693 | */ |
||
694 | #ifdef PNG_USER_TRANSFORM_PTR_SUPPORTED |
||
695 | png_voidp PNGAPI |
||
696 | png_get_user_transform_ptr(png_const_structp png_ptr) |
||
697 | { |
||
698 | if (png_ptr == NULL) |
||
699 | return (NULL); |
||
700 | |||
701 | |||
702 | } |
||
703 | #endif |
||
704 | |||
705 | |||
706 | png_get_current_row_number(png_const_structp png_ptr) |
||
707 | { |
||
708 | if (png_ptr != NULL) |
||
709 | return png_ptr->row_number; |
||
710 | return PNG_UINT_32_MAX; /* help the app not to fail silently */ |
||
711 | } |
||
712 | |||
713 | |||
714 | png_get_current_pass_number(png_const_structp png_ptr) |
||
715 | { |
||
716 | if (png_ptr != NULL) |
||
717 | return png_ptr->pass; |
||
718 | return 8; /* invalid */ |
||
719 | } |
||
720 | #endif /* PNG_READ_USER_TRANSFORM_SUPPORTED || |
||
721 | PNG_WRITE_USER_TRANSFORM_SUPPORTED */ |
||
722 | #endif /* PNG_READ_SUPPORTED || PNG_WRITE_SUPPORTED */>>>>>>>>>>>>>>>>>>>> |
||
723 |