| 1 | ␍␊ |
| 2 | /* pngtrans.c - transforms the data in a row (used by both readers and writers)␍␊ |
| 3 | *␍␊ |
| 4 | * Last changed in libpng 1.5.11 [June 14, 2012]␍␊ |
| 5 | * Copyright (c) 1998-2012 Glenn Randers-Pehrson␍␊ |
| 6 | * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)␍␊ |
| 7 | * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)␍␊ |
| 8 | *␍␊ |
| 9 | * This code is released under the libpng license.␍␊ |
| 10 | * For conditions of distribution and use, see the disclaimer␍␊ |
| 11 | * and license in png.h␍␊ |
| 12 | */␍␊ |
| 13 | ␍␊ |
| 14 | #include "pngpriv.h"␍␊ |
| 15 | ␍␊ |
| 16 | #if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED)␍␊ |
| 17 | ␍␊ |
| 18 | #if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED)␍␊ |
| 19 | /* Turn on BGR-to-RGB mapping */␍␊ |
| 20 | void PNGAPI␍␊ |
| 21 | png_set_bgr(png_structp png_ptr)␍␊ |
| 22 | {␍␊ |
| 23 | png_debug(1, "in png_set_bgr");␍␊ |
| 24 | ␍␊ |
| 25 | if (png_ptr == NULL)␍␊ |
| 26 | return;␍␊ |
| 27 | ␍␊ |
| 28 | png_ptr->transformations |= PNG_BGR;␍␊ |
| 29 | }␍␊ |
| 30 | #endif␍␊ |
| 31 | ␍␊ |
| 32 | #if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED)␍␊ |
| 33 | /* Turn on 16 bit byte swapping */␍␊ |
| 34 | void PNGAPI␍␊ |
| 35 | png_set_swap(png_structp png_ptr)␍␊ |
| 36 | {␍␊ |
| 37 | png_debug(1, "in png_set_swap");␍␊ |
| 38 | ␍␊ |
| 39 | if (png_ptr == NULL)␍␊ |
| 40 | return;␍␊ |
| 41 | ␍␊ |
| 42 | if (png_ptr->bit_depth == 16)␍␊ |
| 43 | png_ptr->transformations |= PNG_SWAP_BYTES;␍␊ |
| 44 | }␍␊ |
| 45 | #endif␍␊ |
| 46 | ␍␊ |
| 47 | #if defined(PNG_READ_PACK_SUPPORTED) || defined(PNG_WRITE_PACK_SUPPORTED)␍␊ |
| 48 | /* Turn on pixel packing */␍␊ |
| 49 | void PNGAPI␍␊ |
| 50 | png_set_packing(png_structp png_ptr)␍␊ |
| 51 | {␍␊ |
| 52 | png_debug(1, "in png_set_packing");␍␊ |
| 53 | ␍␊ |
| 54 | if (png_ptr == NULL)␍␊ |
| 55 | return;␍␊ |
| 56 | ␍␊ |
| 57 | if (png_ptr->bit_depth < 8)␍␊ |
| 58 | {␍␊ |
| 59 | png_ptr->transformations |= PNG_PACK;␍␊ |
| 60 | png_ptr->usr_bit_depth = 8;␍␊ |
| 61 | }␍␊ |
| 62 | }␍␊ |
| 63 | #endif␍␊ |
| 64 | ␍␊ |
| 65 | #if defined(PNG_READ_PACKSWAP_SUPPORTED)||defined(PNG_WRITE_PACKSWAP_SUPPORTED)␍␊ |
| 66 | /* Turn on packed pixel swapping */␍␊ |
| 67 | void PNGAPI␍␊ |
| 68 | png_set_packswap(png_structp png_ptr)␍␊ |
| 69 | {␍␊ |
| 70 | png_debug(1, "in png_set_packswap");␍␊ |
| 71 | ␍␊ |
| 72 | if (png_ptr == NULL)␍␊ |
| 73 | return;␍␊ |
| 74 | ␍␊ |
| 75 | if (png_ptr->bit_depth < 8)␍␊ |
| 76 | png_ptr->transformations |= PNG_PACKSWAP;␍␊ |
| 77 | }␍␊ |
| 78 | #endif␍␊ |
| 79 | ␍␊ |
| 80 | #if defined(PNG_READ_SHIFT_SUPPORTED) || defined(PNG_WRITE_SHIFT_SUPPORTED)␍␊ |
| 81 | void PNGAPI␍␊ |
| 82 | png_set_shift(png_structp png_ptr, png_const_color_8p true_bits)␍␊ |
| 83 | {␍␊ |
| 84 | png_debug(1, "in png_set_shift");␍␊ |
| 85 | ␍␊ |
| 86 | if (png_ptr == NULL)␍␊ |
| 87 | return;␍␊ |
| 88 | ␍␊ |
| 89 | png_ptr->transformations |= PNG_SHIFT;␍␊ |
| 90 | png_ptr->shift = *true_bits;␍␊ |
| 91 | }␍␊ |
| 92 | #endif␍␊ |
| 93 | ␍␊ |
| 94 | #if defined(PNG_READ_INTERLACING_SUPPORTED) || \␍␊ |
| 95 | defined(PNG_WRITE_INTERLACING_SUPPORTED)␍␊ |
| 96 | int PNGAPI␍␊ |
| 97 | png_set_interlace_handling(png_structp png_ptr)␍␊ |
| 98 | {␍␊ |
| 99 | png_debug(1, "in png_set_interlace handling");␍␊ |
| 100 | ␍␊ |
| 101 | if (png_ptr && png_ptr->interlaced)␍␊ |
| 102 | {␍␊ |
| 103 | png_ptr->transformations |= PNG_INTERLACE;␍␊ |
| 104 | return (7);␍␊ |
| 105 | }␍␊ |
| 106 | ␍␊ |
| 107 | return (1);␍␊ |
| 108 | }␍␊ |
| 109 | #endif␍␊ |
| 110 | ␍␊ |
| 111 | #if defined(PNG_READ_FILLER_SUPPORTED) || defined(PNG_WRITE_FILLER_SUPPORTED)␍␊ |
| 112 | /* Add a filler byte on read, or remove a filler or alpha byte on write.␍␊ |
| 113 | * The filler type has changed in v0.95 to allow future 2-byte fillers␍␊ |
| 114 | * for 48-bit input data, as well as to avoid problems with some compilers␍␊ |
| 115 | * that don't like bytes as parameters.␍␊ |
| 116 | */␍␊ |
| 117 | void PNGAPI␍␊ |
| 118 | png_set_filler(png_structp png_ptr, png_uint_32 filler, int filler_loc)␍␊ |
| 119 | {␍␊ |
| 120 | png_debug(1, "in png_set_filler");␍␊ |
| 121 | ␍␊ |
| 122 | if (png_ptr == NULL)␍␊ |
| 123 | return;␍␊ |
| 124 | ␍␊ |
| 125 | png_ptr->transformations |= PNG_FILLER;␍␊ |
| 126 | png_ptr->filler = (png_uint_16)filler;␍␊ |
| 127 | ␍␊ |
| 128 | if (filler_loc == PNG_FILLER_AFTER)␍␊ |
| 129 | png_ptr->flags |= PNG_FLAG_FILLER_AFTER;␍␊ |
| 130 | ␍␊ |
| 131 | else␍␊ |
| 132 | png_ptr->flags &= ~PNG_FLAG_FILLER_AFTER;␍␊ |
| 133 | ␍␊ |
| 134 | /* This should probably go in the "do_read_filler" routine.␍␊ |
| 135 | * I attempted to do that in libpng-1.0.1a but that caused problems␍␊ |
| 136 | * so I restored it in libpng-1.0.2a␍␊ |
| 137 | */␍␊ |
| 138 | ␍␊ |
| 139 | if (png_ptr->color_type == PNG_COLOR_TYPE_RGB)␍␊ |
| 140 | {␍␊ |
| 141 | png_ptr->usr_channels = 4;␍␊ |
| 142 | }␍␊ |
| 143 | ␍␊ |
| 144 | /* Also I added this in libpng-1.0.2a (what happens when we expand␍␊ |
| 145 | * a less-than-8-bit grayscale to GA?) */␍␊ |
| 146 | ␍␊ |
| 147 | if (png_ptr->color_type == PNG_COLOR_TYPE_GRAY && png_ptr->bit_depth >= 8)␍␊ |
| 148 | {␍␊ |
| 149 | png_ptr->usr_channels = 2;␍␊ |
| 150 | }␍␊ |
| 151 | }␍␊ |
| 152 | ␍␊ |
| 153 | /* Added to libpng-1.2.7 */␍␊ |
| 154 | void PNGAPI␍␊ |
| 155 | png_set_add_alpha(png_structp png_ptr, png_uint_32 filler, int filler_loc)␍␊ |
| 156 | {␍␊ |
| 157 | png_debug(1, "in png_set_add_alpha");␍␊ |
| 158 | ␍␊ |
| 159 | if (png_ptr == NULL)␍␊ |
| 160 | return;␍␊ |
| 161 | ␍␊ |
| 162 | png_set_filler(png_ptr, filler, filler_loc);␍␊ |
| 163 | png_ptr->transformations |= PNG_ADD_ALPHA;␍␊ |
| 164 | }␍␊ |
| 165 | ␍␊ |
| 166 | #endif␍␊ |
| 167 | ␍␊ |
| 168 | #if defined(PNG_READ_SWAP_ALPHA_SUPPORTED) || \␍␊ |
| 169 | defined(PNG_WRITE_SWAP_ALPHA_SUPPORTED)␍␊ |
| 170 | void PNGAPI␍␊ |
| 171 | png_set_swap_alpha(png_structp png_ptr)␍␊ |
| 172 | {␍␊ |
| 173 | png_debug(1, "in png_set_swap_alpha");␍␊ |
| 174 | ␍␊ |
| 175 | if (png_ptr == NULL)␍␊ |
| 176 | return;␍␊ |
| 177 | ␍␊ |
| 178 | png_ptr->transformations |= PNG_SWAP_ALPHA;␍␊ |
| 179 | }␍␊ |
| 180 | #endif␍␊ |
| 181 | ␍␊ |
| 182 | #if defined(PNG_READ_INVERT_ALPHA_SUPPORTED) || \␍␊ |
| 183 | defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED)␍␊ |
| 184 | void PNGAPI␍␊ |
| 185 | png_set_invert_alpha(png_structp png_ptr)␍␊ |
| 186 | {␍␊ |
| 187 | png_debug(1, "in png_set_invert_alpha");␍␊ |
| 188 | ␍␊ |
| 189 | if (png_ptr == NULL)␍␊ |
| 190 | return;␍␊ |
| 191 | ␍␊ |
| 192 | png_ptr->transformations |= PNG_INVERT_ALPHA;␍␊ |
| 193 | }␍␊ |
| 194 | #endif␍␊ |
| 195 | ␍␊ |
| 196 | #if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED)␍␊ |
| 197 | void PNGAPI␍␊ |
| 198 | png_set_invert_mono(png_structp png_ptr)␍␊ |
| 199 | {␍␊ |
| 200 | png_debug(1, "in png_set_invert_mono");␍␊ |
| 201 | ␍␊ |
| 202 | if (png_ptr == NULL)␍␊ |
| 203 | return;␍␊ |
| 204 | ␍␊ |
| 205 | png_ptr->transformations |= PNG_INVERT_MONO;␍␊ |
| 206 | }␍␊ |
| 207 | ␍␊ |
| 208 | /* Invert monochrome grayscale data */␍␊ |
| 209 | void /* PRIVATE */␍␊ |
| 210 | png_do_invert(png_row_infop row_info, png_bytep row)␍␊ |
| 211 | {␍␊ |
| 212 | png_debug(1, "in png_do_invert");␍␊ |
| 213 | ␍␊ |
| 214 | /* This test removed from libpng version 1.0.13 and 1.2.0:␍␊ |
| 215 | * if (row_info->bit_depth == 1 &&␍␊ |
| 216 | */␍␊ |
| 217 | if (row_info->color_type == PNG_COLOR_TYPE_GRAY)␍␊ |
| 218 | {␍␊ |
| 219 | png_bytep rp = row;␍␊ |
| 220 | png_size_t i;␍␊ |
| 221 | png_size_t istop = row_info->rowbytes;␍␊ |
| 222 | ␍␊ |
| 223 | for (i = 0; i < istop; i++)␍␊ |
| 224 | {␍␊ |
| 225 | *rp = (png_byte)(~(*rp));␍␊ |
| 226 | rp++;␍␊ |
| 227 | }␍␊ |
| 228 | }␍␊ |
| 229 | ␍␊ |
| 230 | else if (row_info->color_type == PNG_COLOR_TYPE_GRAY_ALPHA &&␍␊ |
| 231 | row_info->bit_depth == 8)␍␊ |
| 232 | {␍␊ |
| 233 | png_bytep rp = row;␍␊ |
| 234 | png_size_t i;␍␊ |
| 235 | png_size_t istop = row_info->rowbytes;␍␊ |
| 236 | ␍␊ |
| 237 | for (i = 0; i < istop; i += 2)␍␊ |
| 238 | {␍␊ |
| 239 | *rp = (png_byte)(~(*rp));␍␊ |
| 240 | rp += 2;␍␊ |
| 241 | }␍␊ |
| 242 | }␍␊ |
| 243 | ␍␊ |
| 244 | #ifdef PNG_16BIT_SUPPORTED␍␊ |
| 245 | else if (row_info->color_type == PNG_COLOR_TYPE_GRAY_ALPHA &&␍␊ |
| 246 | row_info->bit_depth == 16)␍␊ |
| 247 | {␍␊ |
| 248 | png_bytep rp = row;␍␊ |
| 249 | png_size_t i;␍␊ |
| 250 | png_size_t istop = row_info->rowbytes;␍␊ |
| 251 | ␍␊ |
| 252 | for (i = 0; i < istop; i += 4)␍␊ |
| 253 | {␍␊ |
| 254 | *rp = (png_byte)(~(*rp));␍␊ |
| 255 | *(rp + 1) = (png_byte)(~(*(rp + 1)));␍␊ |
| 256 | rp += 4;␍␊ |
| 257 | }␍␊ |
| 258 | }␍␊ |
| 259 | #endif␍␊ |
| 260 | }␍␊ |
| 261 | #endif␍␊ |
| 262 | ␍␊ |
| 263 | #ifdef PNG_16BIT_SUPPORTED␍␊ |
| 264 | #if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED)␍␊ |
| 265 | /* Swaps byte order on 16 bit depth images */␍␊ |
| 266 | void /* PRIVATE */␍␊ |
| 267 | png_do_swap(png_row_infop row_info, png_bytep row)␍␊ |
| 268 | {␍␊ |
| 269 | png_debug(1, "in png_do_swap");␍␊ |
| 270 | ␍␊ |
| 271 | if (row_info->bit_depth == 16)␍␊ |
| 272 | {␍␊ |
| 273 | png_bytep rp = row;␍␊ |
| 274 | png_uint_32 i;␍␊ |
| 275 | png_uint_32 istop= row_info->width * row_info->channels;␍␊ |
| 276 | ␍␊ |
| 277 | for (i = 0; i < istop; i++, rp += 2)␍␊ |
| 278 | {␍␊ |
| 279 | png_byte t = *rp;␍␊ |
| 280 | *rp = *(rp + 1);␍␊ |
| 281 | *(rp + 1) = t;␍␊ |
| 282 | }␍␊ |
| 283 | }␍␊ |
| 284 | }␍␊ |
| 285 | #endif␍␊ |
| 286 | #endif␍␊ |
| 287 | ␍␊ |
| 288 | #if defined(PNG_READ_PACKSWAP_SUPPORTED)||defined(PNG_WRITE_PACKSWAP_SUPPORTED)␍␊ |
| 289 | static PNG_CONST png_byte onebppswaptable[256] = {␍␊ |
| 290 | 0x00, 0x80, 0x40, 0xC0, 0x20, 0xA0, 0x60, 0xE0,␍␊ |
| 291 | 0x10, 0x90, 0x50, 0xD0, 0x30, 0xB0, 0x70, 0xF0,␍␊ |
| 292 | 0x08, 0x88, 0x48, 0xC8, 0x28, 0xA8, 0x68, 0xE8,␍␊ |
| 293 | 0x18, 0x98, 0x58, 0xD8, 0x38, 0xB8, 0x78, 0xF8,␍␊ |
| 294 | 0x04, 0x84, 0x44, 0xC4, 0x24, 0xA4, 0x64, 0xE4,␍␊ |
| 295 | 0x14, 0x94, 0x54, 0xD4, 0x34, 0xB4, 0x74, 0xF4,␍␊ |
| 296 | 0x0C, 0x8C, 0x4C, 0xCC, 0x2C, 0xAC, 0x6C, 0xEC,␍␊ |
| 297 | 0x1C, 0x9C, 0x5C, 0xDC, 0x3C, 0xBC, 0x7C, 0xFC,␍␊ |
| 298 | 0x02, 0x82, 0x42, 0xC2, 0x22, 0xA2, 0x62, 0xE2,␍␊ |
| 299 | 0x12, 0x92, 0x52, 0xD2, 0x32, 0xB2, 0x72, 0xF2,␍␊ |
| 300 | 0x0A, 0x8A, 0x4A, 0xCA, 0x2A, 0xAA, 0x6A, 0xEA,␍␊ |
| 301 | 0x1A, 0x9A, 0x5A, 0xDA, 0x3A, 0xBA, 0x7A, 0xFA,␍␊ |
| 302 | 0x06, 0x86, 0x46, 0xC6, 0x26, 0xA6, 0x66, 0xE6,␍␊ |
| 303 | 0x16, 0x96, 0x56, 0xD6, 0x36, 0xB6, 0x76, 0xF6,␍␊ |
| 304 | 0x0E, 0x8E, 0x4E, 0xCE, 0x2E, 0xAE, 0x6E, 0xEE,␍␊ |
| 305 | 0x1E, 0x9E, 0x5E, 0xDE, 0x3E, 0xBE, 0x7E, 0xFE,␍␊ |
| 306 | 0x01, 0x81, 0x41, 0xC1, 0x21, 0xA1, 0x61, 0xE1,␍␊ |
| 307 | 0x11, 0x91, 0x51, 0xD1, 0x31, 0xB1, 0x71, 0xF1,␍␊ |
| 308 | 0x09, 0x89, 0x49, 0xC9, 0x29, 0xA9, 0x69, 0xE9,␍␊ |
| 309 | 0x19, 0x99, 0x59, 0xD9, 0x39, 0xB9, 0x79, 0xF9,␍␊ |
| 310 | 0x05, 0x85, 0x45, 0xC5, 0x25, 0xA5, 0x65, 0xE5,␍␊ |
| 311 | 0x15, 0x95, 0x55, 0xD5, 0x35, 0xB5, 0x75, 0xF5,␍␊ |
| 312 | 0x0D, 0x8D, 0x4D, 0xCD, 0x2D, 0xAD, 0x6D, 0xED,␍␊ |
| 313 | 0x1D, 0x9D, 0x5D, 0xDD, 0x3D, 0xBD, 0x7D, 0xFD,␍␊ |
| 314 | 0x03, 0x83, 0x43, 0xC3, 0x23, 0xA3, 0x63, 0xE3,␍␊ |
| 315 | 0x13, 0x93, 0x53, 0xD3, 0x33, 0xB3, 0x73, 0xF3,␍␊ |
| 316 | 0x0B, 0x8B, 0x4B, 0xCB, 0x2B, 0xAB, 0x6B, 0xEB,␍␊ |
| 317 | 0x1B, 0x9B, 0x5B, 0xDB, 0x3B, 0xBB, 0x7B, 0xFB,␍␊ |
| 318 | 0x07, 0x87, 0x47, 0xC7, 0x27, 0xA7, 0x67, 0xE7,␍␊ |
| 319 | 0x17, 0x97, 0x57, 0xD7, 0x37, 0xB7, 0x77, 0xF7,␍␊ |
| 320 | 0x0F, 0x8F, 0x4F, 0xCF, 0x2F, 0xAF, 0x6F, 0xEF,␍␊ |
| 321 | 0x1F, 0x9F, 0x5F, 0xDF, 0x3F, 0xBF, 0x7F, 0xFF␍␊ |
| 322 | };␍␊ |
| 323 | ␍␊ |
| 324 | static PNG_CONST png_byte twobppswaptable[256] = {␍␊ |
| 325 | 0x00, 0x40, 0x80, 0xC0, 0x10, 0x50, 0x90, 0xD0,␍␊ |
| 326 | 0x20, 0x60, 0xA0, 0xE0, 0x30, 0x70, 0xB0, 0xF0,␍␊ |
| 327 | 0x04, 0x44, 0x84, 0xC4, 0x14, 0x54, 0x94, 0xD4,␍␊ |
| 328 | 0x24, 0x64, 0xA4, 0xE4, 0x34, 0x74, 0xB4, 0xF4,␍␊ |
| 329 | 0x08, 0x48, 0x88, 0xC8, 0x18, 0x58, 0x98, 0xD8,␍␊ |
| 330 | 0x28, 0x68, 0xA8, 0xE8, 0x38, 0x78, 0xB8, 0xF8,␍␊ |
| 331 | 0x0C, 0x4C, 0x8C, 0xCC, 0x1C, 0x5C, 0x9C, 0xDC,␍␊ |
| 332 | 0x2C, 0x6C, 0xAC, 0xEC, 0x3C, 0x7C, 0xBC, 0xFC,␍␊ |
| 333 | 0x01, 0x41, 0x81, 0xC1, 0x11, 0x51, 0x91, 0xD1,␍␊ |
| 334 | 0x21, 0x61, 0xA1, 0xE1, 0x31, 0x71, 0xB1, 0xF1,␍␊ |
| 335 | 0x05, 0x45, 0x85, 0xC5, 0x15, 0x55, 0x95, 0xD5,␍␊ |
| 336 | 0x25, 0x65, 0xA5, 0xE5, 0x35, 0x75, 0xB5, 0xF5,␍␊ |
| 337 | 0x09, 0x49, 0x89, 0xC9, 0x19, 0x59, 0x99, 0xD9,␍␊ |
| 338 | 0x29, 0x69, 0xA9, 0xE9, 0x39, 0x79, 0xB9, 0xF9,␍␊ |
| 339 | 0x0D, 0x4D, 0x8D, 0xCD, 0x1D, 0x5D, 0x9D, 0xDD,␍␊ |
| 340 | 0x2D, 0x6D, 0xAD, 0xED, 0x3D, 0x7D, 0xBD, 0xFD,␍␊ |
| 341 | 0x02, 0x42, 0x82, 0xC2, 0x12, 0x52, 0x92, 0xD2,␍␊ |
| 342 | 0x22, 0x62, 0xA2, 0xE2, 0x32, 0x72, 0xB2, 0xF2,␍␊ |
| 343 | 0x06, 0x46, 0x86, 0xC6, 0x16, 0x56, 0x96, 0xD6,␍␊ |
| 344 | 0x26, 0x66, 0xA6, 0xE6, 0x36, 0x76, 0xB6, 0xF6,␍␊ |
| 345 | 0x0A, 0x4A, 0x8A, 0xCA, 0x1A, 0x5A, 0x9A, 0xDA,␍␊ |
| 346 | 0x2A, 0x6A, 0xAA, 0xEA, 0x3A, 0x7A, 0xBA, 0xFA,␍␊ |
| 347 | 0x0E, 0x4E, 0x8E, 0xCE, 0x1E, 0x5E, 0x9E, 0xDE,␍␊ |
| 348 | 0x2E, 0x6E, 0xAE, 0xEE, 0x3E, 0x7E, 0xBE, 0xFE,␍␊ |
| 349 | 0x03, 0x43, 0x83, 0xC3, 0x13, 0x53, 0x93, 0xD3,␍␊ |
| 350 | 0x23, 0x63, 0xA3, 0xE3, 0x33, 0x73, 0xB3, 0xF3,␍␊ |
| 351 | 0x07, 0x47, 0x87, 0xC7, 0x17, 0x57, 0x97, 0xD7,␍␊ |
| 352 | 0x27, 0x67, 0xA7, 0xE7, 0x37, 0x77, 0xB7, 0xF7,␍␊ |
| 353 | 0x0B, 0x4B, 0x8B, 0xCB, 0x1B, 0x5B, 0x9B, 0xDB,␍␊ |
| 354 | 0x2B, 0x6B, 0xAB, 0xEB, 0x3B, 0x7B, 0xBB, 0xFB,␍␊ |
| 355 | 0x0F, 0x4F, 0x8F, 0xCF, 0x1F, 0x5F, 0x9F, 0xDF,␍␊ |
| 356 | 0x2F, 0x6F, 0xAF, 0xEF, 0x3F, 0x7F, 0xBF, 0xFF␍␊ |
| 357 | };␍␊ |
| 358 | ␍␊ |
| 359 | static PNG_CONST png_byte fourbppswaptable[256] = {␍␊ |
| 360 | 0x00, 0x10, 0x20, 0x30, 0x40, 0x50, 0x60, 0x70,␍␊ |
| 361 | 0x80, 0x90, 0xA0, 0xB0, 0xC0, 0xD0, 0xE0, 0xF0,␍␊ |
| 362 | 0x01, 0x11, 0x21, 0x31, 0x41, 0x51, 0x61, 0x71,␍␊ |
| 363 | 0x81, 0x91, 0xA1, 0xB1, 0xC1, 0xD1, 0xE1, 0xF1,␍␊ |
| 364 | 0x02, 0x12, 0x22, 0x32, 0x42, 0x52, 0x62, 0x72,␍␊ |
| 365 | 0x82, 0x92, 0xA2, 0xB2, 0xC2, 0xD2, 0xE2, 0xF2,␍␊ |
| 366 | 0x03, 0x13, 0x23, 0x33, 0x43, 0x53, 0x63, 0x73,␍␊ |
| 367 | 0x83, 0x93, 0xA3, 0xB3, 0xC3, 0xD3, 0xE3, 0xF3,␍␊ |
| 368 | 0x04, 0x14, 0x24, 0x34, 0x44, 0x54, 0x64, 0x74,␍␊ |
| 369 | 0x84, 0x94, 0xA4, 0xB4, 0xC4, 0xD4, 0xE4, 0xF4,␍␊ |
| 370 | 0x05, 0x15, 0x25, 0x35, 0x45, 0x55, 0x65, 0x75,␍␊ |
| 371 | 0x85, 0x95, 0xA5, 0xB5, 0xC5, 0xD5, 0xE5, 0xF5,␍␊ |
| 372 | 0x06, 0x16, 0x26, 0x36, 0x46, 0x56, 0x66, 0x76,␍␊ |
| 373 | 0x86, 0x96, 0xA6, 0xB6, 0xC6, 0xD6, 0xE6, 0xF6,␍␊ |
| 374 | 0x07, 0x17, 0x27, 0x37, 0x47, 0x57, 0x67, 0x77,␍␊ |
| 375 | 0x87, 0x97, 0xA7, 0xB7, 0xC7, 0xD7, 0xE7, 0xF7,␍␊ |
| 376 | 0x08, 0x18, 0x28, 0x38, 0x48, 0x58, 0x68, 0x78,␍␊ |
| 377 | 0x88, 0x98, 0xA8, 0xB8, 0xC8, 0xD8, 0xE8, 0xF8,␍␊ |
| 378 | 0x09, 0x19, 0x29, 0x39, 0x49, 0x59, 0x69, 0x79,␍␊ |
| 379 | 0x89, 0x99, 0xA9, 0xB9, 0xC9, 0xD9, 0xE9, 0xF9,␍␊ |
| 380 | 0x0A, 0x1A, 0x2A, 0x3A, 0x4A, 0x5A, 0x6A, 0x7A,␍␊ |
| 381 | 0x8A, 0x9A, 0xAA, 0xBA, 0xCA, 0xDA, 0xEA, 0xFA,␍␊ |
| 382 | 0x0B, 0x1B, 0x2B, 0x3B, 0x4B, 0x5B, 0x6B, 0x7B,␍␊ |
| 383 | 0x8B, 0x9B, 0xAB, 0xBB, 0xCB, 0xDB, 0xEB, 0xFB,␍␊ |
| 384 | 0x0C, 0x1C, 0x2C, 0x3C, 0x4C, 0x5C, 0x6C, 0x7C,␍␊ |
| 385 | 0x8C, 0x9C, 0xAC, 0xBC, 0xCC, 0xDC, 0xEC, 0xFC,␍␊ |
| 386 | 0x0D, 0x1D, 0x2D, 0x3D, 0x4D, 0x5D, 0x6D, 0x7D,␍␊ |
| 387 | 0x8D, 0x9D, 0xAD, 0xBD, 0xCD, 0xDD, 0xED, 0xFD,␍␊ |
| 388 | 0x0E, 0x1E, 0x2E, 0x3E, 0x4E, 0x5E, 0x6E, 0x7E,␍␊ |
| 389 | 0x8E, 0x9E, 0xAE, 0xBE, 0xCE, 0xDE, 0xEE, 0xFE,␍␊ |
| 390 | 0x0F, 0x1F, 0x2F, 0x3F, 0x4F, 0x5F, 0x6F, 0x7F,␍␊ |
| 391 | 0x8F, 0x9F, 0xAF, 0xBF, 0xCF, 0xDF, 0xEF, 0xFF␍␊ |
| 392 | };␍␊ |
| 393 | ␍␊ |
| 394 | /* Swaps pixel packing order within bytes */␍␊ |
| 395 | void /* PRIVATE */␍␊ |
| 396 | png_do_packswap(png_row_infop row_info, png_bytep row)␍␊ |
| 397 | {␍␊ |
| 398 | png_debug(1, "in png_do_packswap");␍␊ |
| 399 | ␍␊ |
| 400 | if (row_info->bit_depth < 8)␍␊ |
| 401 | {␍␊ |
| 402 | png_bytep rp;␍␊ |
| 403 | png_const_bytep end, table;␍␊ |
| 404 | ␍␊ |
| 405 | end = row + row_info->rowbytes;␍␊ |
| 406 | ␍␊ |
| 407 | if (row_info->bit_depth == 1)␍␊ |
| 408 | table = onebppswaptable;␍␊ |
| 409 | ␍␊ |
| 410 | else if (row_info->bit_depth == 2)␍␊ |
| 411 | table = twobppswaptable;␍␊ |
| 412 | ␍␊ |
| 413 | else if (row_info->bit_depth == 4)␍␊ |
| 414 | table = fourbppswaptable;␍␊ |
| 415 | ␍␊ |
| 416 | else␍␊ |
| 417 | return;␍␊ |
| 418 | ␍␊ |
| 419 | for (rp = row; rp < end; rp++)␍␊ |
| 420 | *rp = table[*rp];␍␊ |
| 421 | }␍␊ |
| 422 | }␍␊ |
| 423 | #endif /* PNG_READ_PACKSWAP_SUPPORTED or PNG_WRITE_PACKSWAP_SUPPORTED */␍␊ |
| 424 | ␍␊ |
| 425 | #if defined(PNG_WRITE_FILLER_SUPPORTED) || \␍␊ |
| 426 | defined(PNG_READ_STRIP_ALPHA_SUPPORTED)␍␊ |
| 427 | /* Remove a channel - this used to be 'png_do_strip_filler' but it used a␍␊ |
| 428 | * somewhat weird combination of flags to determine what to do. All the calls␍␊ |
| 429 | * to png_do_strip_filler are changed in 1.5.2 to call this instead with the␍␊ |
| 430 | * correct arguments.␍␊ |
| 431 | *␍␊ |
| 432 | * The routine isn't general - the channel must be the channel at the start or␍␊ |
| 433 | * end (not in the middle) of each pixel.␍␊ |
| 434 | */␍␊ |
| 435 | void /* PRIVATE */␍␊ |
| 436 | png_do_strip_channel(png_row_infop row_info, png_bytep row, int at_start)␍␊ |
| 437 | {␍␊ |
| 438 | png_bytep sp = row; /* source pointer */␍␊ |
| 439 | png_bytep dp = row; /* destination pointer */␍␊ |
| 440 | png_bytep ep = row + row_info->rowbytes; /* One beyond end of row */␍␊ |
| 441 | ␍␊ |
| 442 | /* At the start sp will point to the first byte to copy and dp to where␍␊ |
| 443 | * it is copied to. ep always points just beyond the end of the row, so␍␊ |
| 444 | * the loop simply copies (channels-1) channels until sp reaches ep.␍␊ |
| 445 | *␍␊ |
| 446 | * at_start: 0 -- convert AG, XG, ARGB, XRGB, AAGG, XXGG, etc.␍␊ |
| 447 | * nonzero -- convert GA, GX, RGBA, RGBX, GGAA, RRGGBBXX, etc.␍␊ |
| 448 | */␍␊ |
| 449 | ␍␊ |
| 450 | /* GA, GX, XG cases */␍␊ |
| 451 | if (row_info->channels == 2)␍␊ |
| 452 | {␍␊ |
| 453 | if (row_info->bit_depth == 8)␍␊ |
| 454 | {␍␊ |
| 455 | if (at_start) /* Skip initial filler */␍␊ |
| 456 | ++sp;␍␊ |
| 457 | else /* Skip initial channel and, for sp, the filler */␍␊ |
| 458 | sp += 2, ++dp;␍␊ |
| 459 | ␍␊ |
| 460 | /* For a 1 pixel wide image there is nothing to do */␍␊ |
| 461 | while (sp < ep)␍␊ |
| 462 | *dp++ = *sp, sp += 2;␍␊ |
| 463 | ␍␊ |
| 464 | row_info->pixel_depth = 8;␍␊ |
| 465 | }␍␊ |
| 466 | ␍␊ |
| 467 | else if (row_info->bit_depth == 16)␍␊ |
| 468 | {␍␊ |
| 469 | if (at_start) /* Skip initial filler */␍␊ |
| 470 | sp += 2;␍␊ |
| 471 | else /* Skip initial channel and, for sp, the filler */␍␊ |
| 472 | sp += 4, dp += 2;␍␊ |
| 473 | ␍␊ |
| 474 | while (sp < ep)␍␊ |
| 475 | *dp++ = *sp++, *dp++ = *sp, sp += 3;␍␊ |
| 476 | ␍␊ |
| 477 | row_info->pixel_depth = 16;␍␊ |
| 478 | }␍␊ |
| 479 | ␍␊ |
| 480 | else␍␊ |
| 481 | return; /* bad bit depth */␍␊ |
| 482 | ␍␊ |
| 483 | row_info->channels = 1;␍␊ |
| 484 | ␍␊ |
| 485 | /* Finally fix the color type if it records an alpha channel */␍␊ |
| 486 | if (row_info->color_type == PNG_COLOR_TYPE_GRAY_ALPHA)␍␊ |
| 487 | row_info->color_type = PNG_COLOR_TYPE_GRAY;␍␊ |
| 488 | }␍␊ |
| 489 | ␍␊ |
| 490 | /* RGBA, RGBX, XRGB cases */␍␊ |
| 491 | else if (row_info->channels == 4)␍␊ |
| 492 | {␍␊ |
| 493 | if (row_info->bit_depth == 8)␍␊ |
| 494 | {␍␊ |
| 495 | if (at_start) /* Skip initial filler */␍␊ |
| 496 | ++sp;␍␊ |
| 497 | else /* Skip initial channels and, for sp, the filler */␍␊ |
| 498 | sp += 4, dp += 3;␍␊ |
| 499 | ␍␊ |
| 500 | /* Note that the loop adds 3 to dp and 4 to sp each time. */␍␊ |
| 501 | while (sp < ep)␍␊ |
| 502 | *dp++ = *sp++, *dp++ = *sp++, *dp++ = *sp, sp += 2;␍␊ |
| 503 | ␍␊ |
| 504 | row_info->pixel_depth = 24;␍␊ |
| 505 | }␍␊ |
| 506 | ␍␊ |
| 507 | else if (row_info->bit_depth == 16)␍␊ |
| 508 | {␍␊ |
| 509 | if (at_start) /* Skip initial filler */␍␊ |
| 510 | sp += 2;␍␊ |
| 511 | else /* Skip initial channels and, for sp, the filler */␍␊ |
| 512 | sp += 8, dp += 6;␍␊ |
| 513 | ␍␊ |
| 514 | while (sp < ep)␍␊ |
| 515 | {␍␊ |
| 516 | /* Copy 6 bytes, skip 2 */␍␊ |
| 517 | *dp++ = *sp++, *dp++ = *sp++;␍␊ |
| 518 | *dp++ = *sp++, *dp++ = *sp++;␍␊ |
| 519 | *dp++ = *sp++, *dp++ = *sp, sp += 3;␍␊ |
| 520 | }␍␊ |
| 521 | ␍␊ |
| 522 | row_info->pixel_depth = 48;␍␊ |
| 523 | }␍␊ |
| 524 | ␍␊ |
| 525 | else␍␊ |
| 526 | return; /* bad bit depth */␍␊ |
| 527 | ␍␊ |
| 528 | row_info->channels = 3;␍␊ |
| 529 | ␍␊ |
| 530 | /* Finally fix the color type if it records an alpha channel */␍␊ |
| 531 | if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA)␍␊ |
| 532 | row_info->color_type = PNG_COLOR_TYPE_RGB;␍␊ |
| 533 | }␍␊ |
| 534 | ␍␊ |
| 535 | else␍␊ |
| 536 | return; /* The filler channel has gone already */␍␊ |
| 537 | ␍␊ |
| 538 | /* Fix the rowbytes value. */␍␊ |
| 539 | row_info->rowbytes = dp-row;␍␊ |
| 540 | }␍␊ |
| 541 | #endif␍␊ |
| 542 | ␍␊ |
| 543 | #if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED)␍␊ |
| 544 | /* Swaps red and blue bytes within a pixel */␍␊ |
| 545 | void /* PRIVATE */␍␊ |
| 546 | png_do_bgr(png_row_infop row_info, png_bytep row)␍␊ |
| 547 | {␍␊ |
| 548 | png_debug(1, "in png_do_bgr");␍␊ |
| 549 | ␍␊ |
| 550 | if ((row_info->color_type & PNG_COLOR_MASK_COLOR))␍␊ |
| 551 | {␍␊ |
| 552 | png_uint_32 row_width = row_info->width;␍␊ |
| 553 | if (row_info->bit_depth == 8)␍␊ |
| 554 | {␍␊ |
| 555 | if (row_info->color_type == PNG_COLOR_TYPE_RGB)␍␊ |
| 556 | {␍␊ |
| 557 | png_bytep rp;␍␊ |
| 558 | png_uint_32 i;␍␊ |
| 559 | ␍␊ |
| 560 | for (i = 0, rp = row; i < row_width; i++, rp += 3)␍␊ |
| 561 | {␍␊ |
| 562 | png_byte save = *rp;␍␊ |
| 563 | *rp = *(rp + 2);␍␊ |
| 564 | *(rp + 2) = save;␍␊ |
| 565 | }␍␊ |
| 566 | }␍␊ |
| 567 | ␍␊ |
| 568 | else if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA)␍␊ |
| 569 | {␍␊ |
| 570 | png_bytep rp;␍␊ |
| 571 | png_uint_32 i;␍␊ |
| 572 | ␍␊ |
| 573 | for (i = 0, rp = row; i < row_width; i++, rp += 4)␍␊ |
| 574 | {␍␊ |
| 575 | png_byte save = *rp;␍␊ |
| 576 | *rp = *(rp + 2);␍␊ |
| 577 | *(rp + 2) = save;␍␊ |
| 578 | }␍␊ |
| 579 | }␍␊ |
| 580 | }␍␊ |
| 581 | ␍␊ |
| 582 | #ifdef PNG_16BIT_SUPPORTED␍␊ |
| 583 | else if (row_info->bit_depth == 16)␍␊ |
| 584 | {␍␊ |
| 585 | if (row_info->color_type == PNG_COLOR_TYPE_RGB)␍␊ |
| 586 | {␍␊ |
| 587 | png_bytep rp;␍␊ |
| 588 | png_uint_32 i;␍␊ |
| 589 | ␍␊ |
| 590 | for (i = 0, rp = row; i < row_width; i++, rp += 6)␍␊ |
| 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 | else if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA)␍␊ |
| 602 | {␍␊ |
| 603 | png_bytep rp;␍␊ |
| 604 | png_uint_32 i;␍␊ |
| 605 | ␍␊ |
| 606 | for (i = 0, rp = row; i < row_width; i++, rp += 8)␍␊ |
| 607 | {␍␊ |
| 608 | png_byte save = *rp;␍␊ |
| 609 | *rp = *(rp + 4);␍␊ |
| 610 | *(rp + 4) = save;␍␊ |
| 611 | save = *(rp + 1);␍␊ |
| 612 | *(rp + 1) = *(rp + 5);␍␊ |
| 613 | *(rp + 5) = save;␍␊ |
| 614 | }␍␊ |
| 615 | }␍␊ |
| 616 | }␍␊ |
| 617 | #endif␍␊ |
| 618 | }␍␊ |
| 619 | }␍␊ |
| 620 | #endif /* PNG_READ_BGR_SUPPORTED or PNG_WRITE_BGR_SUPPORTED */␍␊ |
| 621 | ␍␊ |
| 622 | #if defined(PNG_READ_CHECK_FOR_INVALID_INDEX_SUPPORTED) || \␍␊ |
| 623 | defined(PNG_WRITE_CHECK_FOR_INVALID_INDEX_SUPPORTED)␍␊ |
| 624 | /* Added at libpng-1.5.10 */␍␊ |
| 625 | void /* PRIVATE */␍␊ |
| 626 | png_do_check_palette_indexes(png_structp png_ptr, png_row_infop row_info)␍␊ |
| 627 | {␍␊ |
| 628 | if (png_ptr->num_palette < (1 << row_info->bit_depth) &&␍␊ |
| 629 | png_ptr->num_palette > 0) /* num_palette can be 0 in MNG files */␍␊ |
| 630 | {␍␊ |
| 631 | /* Calculations moved outside switch in an attempt to stop different␍␊ |
| 632 | * compiler warnings. 'padding' is in *bits* within the last byte, it is␍␊ |
| 633 | * an 'int' because pixel_depth becomes an 'int' in the expression below,␍␊ |
| 634 | * and this calculation is used because it avoids warnings that other␍␊ |
| 635 | * forms produced on either GCC or MSVC.␍␊ |
| 636 | */␍␊ |
| 637 | int padding = (-row_info->pixel_depth * row_info->width) & 7;␍␊ |
| 638 | png_bytep rp = png_ptr->row_buf + row_info->rowbytes;␍␊ |
| 639 | ␍␊ |
| 640 | switch (row_info->bit_depth)␍␊ |
| 641 | {␍␊ |
| 642 | case 1:␍␊ |
| 643 | {␍␊ |
| 644 | /* in this case, all bytes must be 0 so we don't need␍␊ |
| 645 | * to unpack the pixels except for the rightmost one.␍␊ |
| 646 | */␍␊ |
| 647 | for (; rp > png_ptr->row_buf; rp--)␍␊ |
| 648 | {␍␊ |
| 649 | if (*rp >> padding != 0)␍␊ |
| 650 | png_ptr->num_palette_max = 1;␍␊ |
| 651 | padding = 0;␍␊ |
| 652 | }␍␊ |
| 653 | ␍␊ |
| 654 | break;␍␊ |
| 655 | }␍␊ |
| 656 | ␍␊ |
| 657 | case 2:␍␊ |
| 658 | {␍␊ |
| 659 | for (; rp > png_ptr->row_buf; rp--)␍␊ |
| 660 | {␍␊ |
| 661 | int i = ((*rp >> padding) & 0x03);␍␊ |
| 662 | ␍␊ |
| 663 | if (i > png_ptr->num_palette_max)␍␊ |
| 664 | png_ptr->num_palette_max = i;␍␊ |
| 665 | ␍␊ |
| 666 | i = (((*rp >> padding) >> 2) & 0x03);␍␊ |
| 667 | ␍␊ |
| 668 | if (i > png_ptr->num_palette_max)␍␊ |
| 669 | png_ptr->num_palette_max = i;␍␊ |
| 670 | ␍␊ |
| 671 | i = (((*rp >> padding) >> 4) & 0x03);␍␊ |
| 672 | ␍␊ |
| 673 | if (i > png_ptr->num_palette_max)␍␊ |
| 674 | png_ptr->num_palette_max = i;␍␊ |
| 675 | ␍␊ |
| 676 | i = (((*rp >> padding) >> 6) & 0x03);␍␊ |
| 677 | ␍␊ |
| 678 | if (i > png_ptr->num_palette_max)␍␊ |
| 679 | png_ptr->num_palette_max = i;␍␊ |
| 680 | ␍␊ |
| 681 | padding = 0;␍␊ |
| 682 | }␍␊ |
| 683 | ␍␊ |
| 684 | break;␍␊ |
| 685 | }␍␊ |
| 686 | ␍␊ |
| 687 | case 4:␍␊ |
| 688 | {␍␊ |
| 689 | for (; rp > png_ptr->row_buf; rp--)␍␊ |
| 690 | {␍␊ |
| 691 | int i = ((*rp >> padding) & 0x0f);␍␊ |
| 692 | ␍␊ |
| 693 | if (i > png_ptr->num_palette_max)␍␊ |
| 694 | png_ptr->num_palette_max = i;␍␊ |
| 695 | ␍␊ |
| 696 | i = (((*rp >> padding) >> 4) & 0x0f);␍␊ |
| 697 | ␍␊ |
| 698 | if (i > png_ptr->num_palette_max)␍␊ |
| 699 | png_ptr->num_palette_max = i;␍␊ |
| 700 | ␍␊ |
| 701 | padding = 0;␍␊ |
| 702 | }␍␊ |
| 703 | ␍␊ |
| 704 | break;␍␊ |
| 705 | }␍␊ |
| 706 | ␍␊ |
| 707 | case 8:␍␊ |
| 708 | {␍␊ |
| 709 | for (; rp > png_ptr->row_buf; rp--)␍␊ |
| 710 | {␍␊ |
| 711 | if (*rp > png_ptr->num_palette_max)␍␊ |
| 712 | png_ptr->num_palette_max = (int) *rp;␍␊ |
| 713 | }␍␊ |
| 714 | ␍␊ |
| 715 | break;␍␊ |
| 716 | }␍␊ |
| 717 | ␍␊ |
| 718 | default:␍␊ |
| 719 | break;␍␊ |
| 720 | }␍␊ |
| 721 | }␍␊ |
| 722 | }␍␊ |
| 723 | #endif /* PNG_CHECK_FOR_INVALID_INDEX_SUPPORTED */␍␊ |
| 724 | ␍␊ |
| 725 | #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \␍␊ |
| 726 | defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED)␍␊ |
| 727 | #ifdef PNG_USER_TRANSFORM_PTR_SUPPORTED␍␊ |
| 728 | void PNGAPI␍␊ |
| 729 | png_set_user_transform_info(png_structp png_ptr, png_voidp␍␊ |
| 730 | user_transform_ptr, int user_transform_depth, int user_transform_channels)␍␊ |
| 731 | {␍␊ |
| 732 | png_debug(1, "in png_set_user_transform_info");␍␊ |
| 733 | ␍␊ |
| 734 | if (png_ptr == NULL)␍␊ |
| 735 | return;␍␊ |
| 736 | png_ptr->user_transform_ptr = user_transform_ptr;␍␊ |
| 737 | png_ptr->user_transform_depth = (png_byte)user_transform_depth;␍␊ |
| 738 | png_ptr->user_transform_channels = (png_byte)user_transform_channels;␍␊ |
| 739 | }␍␊ |
| 740 | #endif␍␊ |
| 741 | ␍␊ |
| 742 | /* This function returns a pointer to the user_transform_ptr associated with␍␊ |
| 743 | * the user transform functions. The application should free any memory␍␊ |
| 744 | * associated with this pointer before png_write_destroy and png_read_destroy␍␊ |
| 745 | * are called.␍␊ |
| 746 | */␍␊ |
| 747 | #ifdef PNG_USER_TRANSFORM_PTR_SUPPORTED␍␊ |
| 748 | png_voidp PNGAPI␍␊ |
| 749 | png_get_user_transform_ptr(png_const_structp png_ptr)␍␊ |
| 750 | {␍␊ |
| 751 | if (png_ptr == NULL)␍␊ |
| 752 | return (NULL);␍␊ |
| 753 | ␍␊ |
| 754 | return ((png_voidp)png_ptr->user_transform_ptr);␍␊ |
| 755 | }␍␊ |
| 756 | #endif␍␊ |
| 757 | ␍␊ |
| 758 | #ifdef PNG_USER_TRANSFORM_INFO_SUPPORTED␍␊ |
| 759 | png_uint_32 PNGAPI␍␊ |
| 760 | png_get_current_row_number(png_const_structp png_ptr)␍␊ |
| 761 | {␍␊ |
| 762 | /* See the comments in png.h - this is the sub-image row when reading and␍␊ |
| 763 | * interlaced image.␍␊ |
| 764 | */␍␊ |
| 765 | if (png_ptr != NULL)␍␊ |
| 766 | return png_ptr->row_number;␍␊ |
| 767 | ␍␊ |
| 768 | return PNG_UINT_32_MAX; /* help the app not to fail silently */␍␊ |
| 769 | }␍␊ |
| 770 | ␍␊ |
| 771 | png_byte PNGAPI␍␊ |
| 772 | png_get_current_pass_number(png_const_structp png_ptr)␍␊ |
| 773 | {␍␊ |
| 774 | if (png_ptr != NULL)␍␊ |
| 775 | return png_ptr->pass;␍␊ |
| 776 | return 8; /* invalid */␍␊ |
| 777 | }␍␊ |
| 778 | #endif /* PNG_USER_TRANSFORM_INFO_SUPPORTED */␍␊ |
| 779 | #endif /* PNG_READ_USER_TRANSFORM_SUPPORTED ||␍␊ |
| 780 | PNG_WRITE_USER_TRANSFORM_SUPPORTED */␍␊ |
| 781 | #endif /* PNG_READ_SUPPORTED || PNG_WRITE_SUPPORTED */␍␊ |
| 782 | |
