18b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 28b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project/* pngwtran.c - transforms the data in a row for PNG writers 38b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * 4c7702eb5df5f3e72ceedfcd5fb60b94c0a945934David 'Digit' Turner * Last changed in libpng 1.2.43 [February 25, 2010] 5c7702eb5df5f3e72ceedfcd5fb60b94c0a945934David 'Digit' Turner * Copyright (c) 1998-2010 Glenn Randers-Pehrson 68b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger) 78b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.) 8c7702eb5df5f3e72ceedfcd5fb60b94c0a945934David 'Digit' Turner * 9c7702eb5df5f3e72ceedfcd5fb60b94c0a945934David 'Digit' Turner * This code is released under the libpng license. 10c7702eb5df5f3e72ceedfcd5fb60b94c0a945934David 'Digit' Turner * For conditions of distribution and use, see the disclaimer 11c7702eb5df5f3e72ceedfcd5fb60b94c0a945934David 'Digit' Turner * and license in png.h 128b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project */ 138b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 148b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#define PNG_INTERNAL 15c7702eb5df5f3e72ceedfcd5fb60b94c0a945934David 'Digit' Turner#define PNG_NO_PEDANTIC_WARNINGS 168b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#include "png.h" 178b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#ifdef PNG_WRITE_SUPPORTED 188b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 198b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project/* Transform the data according to the user's wishes. The order of 208b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * transformations is significant. 218b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project */ 228b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Projectvoid /* PRIVATE */ 238b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Projectpng_do_write_transformations(png_structp png_ptr) 248b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project{ 25c7702eb5df5f3e72ceedfcd5fb60b94c0a945934David 'Digit' Turner png_debug(1, "in png_do_write_transformations"); 268b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 278b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (png_ptr == NULL) 288b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project return; 298b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 30c7702eb5df5f3e72ceedfcd5fb60b94c0a945934David 'Digit' Turner#ifdef PNG_WRITE_USER_TRANSFORM_SUPPORTED 318b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (png_ptr->transformations & PNG_USER_TRANSFORM) 32c7702eb5df5f3e72ceedfcd5fb60b94c0a945934David 'Digit' Turner if (png_ptr->write_user_transform_fn != NULL) 33c7702eb5df5f3e72ceedfcd5fb60b94c0a945934David 'Digit' Turner (*(png_ptr->write_user_transform_fn)) /* User write transform 34c7702eb5df5f3e72ceedfcd5fb60b94c0a945934David 'Digit' Turner function */ 358b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project (png_ptr, /* png_ptr */ 368b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project &(png_ptr->row_info), /* row_info: */ 378b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project /* png_uint_32 width; width of row */ 388b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project /* png_uint_32 rowbytes; number of bytes in row */ 398b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project /* png_byte color_type; color type of pixels */ 408b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project /* png_byte bit_depth; bit depth of samples */ 418b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project /* png_byte channels; number of channels (1-4) */ 428b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project /* png_byte pixel_depth; bits per pixel (depth*channels) */ 438b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project png_ptr->row_buf + 1); /* start of pixel data for row */ 448b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#endif 45c7702eb5df5f3e72ceedfcd5fb60b94c0a945934David 'Digit' Turner#ifdef PNG_WRITE_FILLER_SUPPORTED 468b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (png_ptr->transformations & PNG_FILLER) 478b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project png_do_strip_filler(&(png_ptr->row_info), png_ptr->row_buf + 1, 488b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project png_ptr->flags); 498b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#endif 50c7702eb5df5f3e72ceedfcd5fb60b94c0a945934David 'Digit' Turner#ifdef PNG_WRITE_PACKSWAP_SUPPORTED 518b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (png_ptr->transformations & PNG_PACKSWAP) 528b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project png_do_packswap(&(png_ptr->row_info), png_ptr->row_buf + 1); 538b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#endif 54c7702eb5df5f3e72ceedfcd5fb60b94c0a945934David 'Digit' Turner#ifdef PNG_WRITE_PACK_SUPPORTED 558b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (png_ptr->transformations & PNG_PACK) 568b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project png_do_pack(&(png_ptr->row_info), png_ptr->row_buf + 1, 578b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project (png_uint_32)png_ptr->bit_depth); 588b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#endif 59c7702eb5df5f3e72ceedfcd5fb60b94c0a945934David 'Digit' Turner#ifdef PNG_WRITE_SWAP_SUPPORTED 608b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (png_ptr->transformations & PNG_SWAP_BYTES) 618b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project png_do_swap(&(png_ptr->row_info), png_ptr->row_buf + 1); 628b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#endif 63c7702eb5df5f3e72ceedfcd5fb60b94c0a945934David 'Digit' Turner#ifdef PNG_WRITE_SHIFT_SUPPORTED 648b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (png_ptr->transformations & PNG_SHIFT) 658b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project png_do_shift(&(png_ptr->row_info), png_ptr->row_buf + 1, 668b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project &(png_ptr->shift)); 678b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#endif 68c7702eb5df5f3e72ceedfcd5fb60b94c0a945934David 'Digit' Turner#ifdef PNG_WRITE_SWAP_ALPHA_SUPPORTED 698b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (png_ptr->transformations & PNG_SWAP_ALPHA) 708b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project png_do_write_swap_alpha(&(png_ptr->row_info), png_ptr->row_buf + 1); 718b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#endif 72c7702eb5df5f3e72ceedfcd5fb60b94c0a945934David 'Digit' Turner#ifdef PNG_WRITE_INVERT_ALPHA_SUPPORTED 738b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (png_ptr->transformations & PNG_INVERT_ALPHA) 748b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project png_do_write_invert_alpha(&(png_ptr->row_info), png_ptr->row_buf + 1); 758b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#endif 76c7702eb5df5f3e72ceedfcd5fb60b94c0a945934David 'Digit' Turner#ifdef PNG_WRITE_BGR_SUPPORTED 778b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (png_ptr->transformations & PNG_BGR) 788b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project png_do_bgr(&(png_ptr->row_info), png_ptr->row_buf + 1); 798b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#endif 80c7702eb5df5f3e72ceedfcd5fb60b94c0a945934David 'Digit' Turner#ifdef PNG_WRITE_INVERT_SUPPORTED 818b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (png_ptr->transformations & PNG_INVERT_MONO) 828b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project png_do_invert(&(png_ptr->row_info), png_ptr->row_buf + 1); 838b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#endif 848b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project} 858b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 86c7702eb5df5f3e72ceedfcd5fb60b94c0a945934David 'Digit' Turner#ifdef PNG_WRITE_PACK_SUPPORTED 878b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project/* Pack pixels into bytes. Pass the true bit depth in bit_depth. The 888b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * row_info bit depth should be 8 (one pixel per byte). The channels 898b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * should be 1 (this only happens on grayscale and paletted images). 908b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project */ 918b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Projectvoid /* PRIVATE */ 928b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Projectpng_do_pack(png_row_infop row_info, png_bytep row, png_uint_32 bit_depth) 938b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project{ 94c7702eb5df5f3e72ceedfcd5fb60b94c0a945934David 'Digit' Turner png_debug(1, "in png_do_pack"); 95c7702eb5df5f3e72ceedfcd5fb60b94c0a945934David 'Digit' Turner 968b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (row_info->bit_depth == 8 && 97c7702eb5df5f3e72ceedfcd5fb60b94c0a945934David 'Digit' Turner#ifdef PNG_USELESS_TESTS_SUPPORTED 988b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project row != NULL && row_info != NULL && 998b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#endif 1008b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project row_info->channels == 1) 1018b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project { 1028b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project switch ((int)bit_depth) 1038b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project { 1048b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project case 1: 1058b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project { 1068b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project png_bytep sp, dp; 1078b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project int mask, v; 1088b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project png_uint_32 i; 1098b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project png_uint_32 row_width = row_info->width; 1108b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 1118b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project sp = row; 1128b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project dp = row; 1138b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project mask = 0x80; 1148b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project v = 0; 1158b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 1168b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project for (i = 0; i < row_width; i++) 1178b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project { 1188b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (*sp != 0) 1198b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project v |= mask; 1208b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project sp++; 1218b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (mask > 1) 1228b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project mask >>= 1; 1238b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project else 1248b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project { 1258b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project mask = 0x80; 1268b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project *dp = (png_byte)v; 1278b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project dp++; 1288b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project v = 0; 1298b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 1308b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 1318b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (mask != 0x80) 1328b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project *dp = (png_byte)v; 1338b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project break; 1348b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 1358b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project case 2: 1368b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project { 1378b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project png_bytep sp, dp; 1388b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project int shift, v; 1398b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project png_uint_32 i; 1408b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project png_uint_32 row_width = row_info->width; 1418b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 1428b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project sp = row; 1438b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project dp = row; 1448b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project shift = 6; 1458b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project v = 0; 1468b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project for (i = 0; i < row_width; i++) 1478b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project { 1488b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project png_byte value; 1498b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 1508b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project value = (png_byte)(*sp & 0x03); 1518b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project v |= (value << shift); 1528b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (shift == 0) 1538b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project { 1548b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project shift = 6; 1558b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project *dp = (png_byte)v; 1568b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project dp++; 1578b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project v = 0; 1588b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 1598b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project else 1608b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project shift -= 2; 1618b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project sp++; 1628b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 1638b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (shift != 6) 1648b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project *dp = (png_byte)v; 1658b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project break; 1668b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 1678b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project case 4: 1688b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project { 1698b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project png_bytep sp, dp; 1708b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project int shift, v; 1718b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project png_uint_32 i; 1728b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project png_uint_32 row_width = row_info->width; 1738b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 1748b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project sp = row; 1758b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project dp = row; 1768b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project shift = 4; 1778b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project v = 0; 1788b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project for (i = 0; i < row_width; i++) 1798b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project { 1808b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project png_byte value; 1818b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 1828b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project value = (png_byte)(*sp & 0x0f); 1838b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project v |= (value << shift); 1848b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 1858b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (shift == 0) 1868b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project { 1878b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project shift = 4; 1888b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project *dp = (png_byte)v; 1898b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project dp++; 1908b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project v = 0; 1918b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 1928b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project else 1938b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project shift -= 4; 1948b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 1958b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project sp++; 1968b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 1978b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (shift != 4) 1988b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project *dp = (png_byte)v; 1998b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project break; 2008b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 2018b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 2028b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project row_info->bit_depth = (png_byte)bit_depth; 2038b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project row_info->pixel_depth = (png_byte)(bit_depth * row_info->channels); 2048b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project row_info->rowbytes = PNG_ROWBYTES(row_info->pixel_depth, 2058b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project row_info->width); 2068b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 2078b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project} 2088b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#endif 2098b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 210c7702eb5df5f3e72ceedfcd5fb60b94c0a945934David 'Digit' Turner#ifdef PNG_WRITE_SHIFT_SUPPORTED 2118b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project/* Shift pixel values to take advantage of whole range. Pass the 2128b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * true number of bits in bit_depth. The row should be packed 2138b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * according to row_info->bit_depth. Thus, if you had a row of 2148b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * bit depth 4, but the pixels only had values from 0 to 7, you 2158b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * would pass 3 as bit_depth, and this routine would translate the 2168b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * data to 0 to 15. 2178b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project */ 2188b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Projectvoid /* PRIVATE */ 2198b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Projectpng_do_shift(png_row_infop row_info, png_bytep row, png_color_8p bit_depth) 2208b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project{ 221c7702eb5df5f3e72ceedfcd5fb60b94c0a945934David 'Digit' Turner png_debug(1, "in png_do_shift"); 222c7702eb5df5f3e72ceedfcd5fb60b94c0a945934David 'Digit' Turner 223c7702eb5df5f3e72ceedfcd5fb60b94c0a945934David 'Digit' Turner#ifdef PNG_USELESS_TESTS_SUPPORTED 2248b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (row != NULL && row_info != NULL && 2258b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#else 2268b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if ( 2278b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#endif 2288b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project row_info->color_type != PNG_COLOR_TYPE_PALETTE) 2298b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project { 2308b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project int shift_start[4], shift_dec[4]; 2318b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project int channels = 0; 2328b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 2338b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (row_info->color_type & PNG_COLOR_MASK_COLOR) 2348b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project { 2358b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project shift_start[channels] = row_info->bit_depth - bit_depth->red; 2368b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project shift_dec[channels] = bit_depth->red; 2378b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project channels++; 2388b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project shift_start[channels] = row_info->bit_depth - bit_depth->green; 2398b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project shift_dec[channels] = bit_depth->green; 2408b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project channels++; 2418b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project shift_start[channels] = row_info->bit_depth - bit_depth->blue; 2428b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project shift_dec[channels] = bit_depth->blue; 2438b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project channels++; 2448b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 2458b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project else 2468b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project { 2478b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project shift_start[channels] = row_info->bit_depth - bit_depth->gray; 2488b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project shift_dec[channels] = bit_depth->gray; 2498b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project channels++; 2508b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 2518b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (row_info->color_type & PNG_COLOR_MASK_ALPHA) 2528b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project { 2538b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project shift_start[channels] = row_info->bit_depth - bit_depth->alpha; 2548b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project shift_dec[channels] = bit_depth->alpha; 2558b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project channels++; 2568b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 2578b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 258c7702eb5df5f3e72ceedfcd5fb60b94c0a945934David 'Digit' Turner /* With low row depths, could only be grayscale, so one channel */ 2598b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (row_info->bit_depth < 8) 2608b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project { 2618b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project png_bytep bp = row; 2628b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project png_uint_32 i; 2638b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project png_byte mask; 2648b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project png_uint_32 row_bytes = row_info->rowbytes; 2658b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 2668b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (bit_depth->gray == 1 && row_info->bit_depth == 2) 2678b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project mask = 0x55; 2688b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project else if (row_info->bit_depth == 4 && bit_depth->gray == 3) 2698b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project mask = 0x11; 2708b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project else 2718b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project mask = 0xff; 2728b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 2738b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project for (i = 0; i < row_bytes; i++, bp++) 2748b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project { 2758b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project png_uint_16 v; 2768b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project int j; 2778b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 2788b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project v = *bp; 2798b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project *bp = 0; 2808b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project for (j = shift_start[0]; j > -shift_dec[0]; j -= shift_dec[0]) 2818b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project { 2828b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (j > 0) 2838b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project *bp |= (png_byte)((v << j) & 0xff); 2848b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project else 2858b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project *bp |= (png_byte)((v >> (-j)) & mask); 2868b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 2878b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 2888b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 2898b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project else if (row_info->bit_depth == 8) 2908b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project { 2918b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project png_bytep bp = row; 2928b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project png_uint_32 i; 2938b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project png_uint_32 istop = channels * row_info->width; 2948b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 2958b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project for (i = 0; i < istop; i++, bp++) 2968b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project { 2978b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 2988b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project png_uint_16 v; 2998b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project int j; 3008b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project int c = (int)(i%channels); 3018b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 3028b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project v = *bp; 3038b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project *bp = 0; 3048b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project for (j = shift_start[c]; j > -shift_dec[c]; j -= shift_dec[c]) 3058b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project { 3068b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (j > 0) 3078b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project *bp |= (png_byte)((v << j) & 0xff); 3088b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project else 3098b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project *bp |= (png_byte)((v >> (-j)) & 0xff); 3108b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 3118b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 3128b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 3138b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project else 3148b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project { 3158b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project png_bytep bp; 3168b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project png_uint_32 i; 3178b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project png_uint_32 istop = channels * row_info->width; 3188b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 3198b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project for (bp = row, i = 0; i < istop; i++) 3208b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project { 3218b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project int c = (int)(i%channels); 3228b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project png_uint_16 value, v; 3238b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project int j; 3248b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 3258b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project v = (png_uint_16)(((png_uint_16)(*bp) << 8) + *(bp + 1)); 3268b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project value = 0; 3278b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project for (j = shift_start[c]; j > -shift_dec[c]; j -= shift_dec[c]) 3288b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project { 3298b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (j > 0) 3308b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project value |= (png_uint_16)((v << j) & (png_uint_16)0xffff); 3318b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project else 3328b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project value |= (png_uint_16)((v >> (-j)) & (png_uint_16)0xffff); 3338b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 3348b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project *bp++ = (png_byte)(value >> 8); 3358b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project *bp++ = (png_byte)(value & 0xff); 3368b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 3378b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 3388b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 3398b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project} 3408b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#endif 3418b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 342c7702eb5df5f3e72ceedfcd5fb60b94c0a945934David 'Digit' Turner#ifdef PNG_WRITE_SWAP_ALPHA_SUPPORTED 3438b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Projectvoid /* PRIVATE */ 3448b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Projectpng_do_write_swap_alpha(png_row_infop row_info, png_bytep row) 3458b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project{ 346c7702eb5df5f3e72ceedfcd5fb60b94c0a945934David 'Digit' Turner png_debug(1, "in png_do_write_swap_alpha"); 347c7702eb5df5f3e72ceedfcd5fb60b94c0a945934David 'Digit' Turner 348c7702eb5df5f3e72ceedfcd5fb60b94c0a945934David 'Digit' Turner#ifdef PNG_USELESS_TESTS_SUPPORTED 3498b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (row != NULL && row_info != NULL) 3508b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#endif 3518b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project { 3528b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA) 3538b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project { 3548b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project /* This converts from ARGB to RGBA */ 3558b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (row_info->bit_depth == 8) 3568b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project { 3578b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project png_bytep sp, dp; 3588b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project png_uint_32 i; 3598b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project png_uint_32 row_width = row_info->width; 3608b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project for (i = 0, sp = dp = row; i < row_width; i++) 3618b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project { 3628b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project png_byte save = *(sp++); 3638b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project *(dp++) = *(sp++); 3648b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project *(dp++) = *(sp++); 3658b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project *(dp++) = *(sp++); 3668b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project *(dp++) = save; 3678b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 3688b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 3698b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project /* This converts from AARRGGBB to RRGGBBAA */ 3708b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project else 3718b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project { 3728b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project png_bytep sp, dp; 3738b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project png_uint_32 i; 3748b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project png_uint_32 row_width = row_info->width; 3758b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 3768b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project for (i = 0, sp = dp = row; i < row_width; i++) 3778b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project { 3788b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project png_byte save[2]; 3798b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project save[0] = *(sp++); 3808b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project save[1] = *(sp++); 3818b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project *(dp++) = *(sp++); 3828b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project *(dp++) = *(sp++); 3838b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project *(dp++) = *(sp++); 3848b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project *(dp++) = *(sp++); 3858b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project *(dp++) = *(sp++); 3868b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project *(dp++) = *(sp++); 3878b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project *(dp++) = save[0]; 3888b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project *(dp++) = save[1]; 3898b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 3908b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 3918b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 3928b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project else if (row_info->color_type == PNG_COLOR_TYPE_GRAY_ALPHA) 3938b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project { 3948b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project /* This converts from AG to GA */ 3958b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (row_info->bit_depth == 8) 3968b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project { 3978b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project png_bytep sp, dp; 3988b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project png_uint_32 i; 3998b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project png_uint_32 row_width = row_info->width; 4008b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 4018b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project for (i = 0, sp = dp = row; i < row_width; i++) 4028b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project { 4038b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project png_byte save = *(sp++); 4048b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project *(dp++) = *(sp++); 4058b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project *(dp++) = save; 4068b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 4078b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 4088b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project /* This converts from AAGG to GGAA */ 4098b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project else 4108b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project { 4118b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project png_bytep sp, dp; 4128b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project png_uint_32 i; 4138b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project png_uint_32 row_width = row_info->width; 4148b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 4158b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project for (i = 0, sp = dp = row; i < row_width; i++) 4168b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project { 4178b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project png_byte save[2]; 4188b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project save[0] = *(sp++); 4198b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project save[1] = *(sp++); 4208b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project *(dp++) = *(sp++); 4218b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project *(dp++) = *(sp++); 4228b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project *(dp++) = save[0]; 4238b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project *(dp++) = save[1]; 4248b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 4258b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 4268b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 4278b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 4288b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project} 4298b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#endif 4308b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 431c7702eb5df5f3e72ceedfcd5fb60b94c0a945934David 'Digit' Turner#ifdef PNG_WRITE_INVERT_ALPHA_SUPPORTED 4328b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Projectvoid /* PRIVATE */ 4338b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Projectpng_do_write_invert_alpha(png_row_infop row_info, png_bytep row) 4348b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project{ 435c7702eb5df5f3e72ceedfcd5fb60b94c0a945934David 'Digit' Turner png_debug(1, "in png_do_write_invert_alpha"); 436c7702eb5df5f3e72ceedfcd5fb60b94c0a945934David 'Digit' Turner 437c7702eb5df5f3e72ceedfcd5fb60b94c0a945934David 'Digit' Turner#ifdef PNG_USELESS_TESTS_SUPPORTED 4388b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (row != NULL && row_info != NULL) 4398b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#endif 4408b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project { 4418b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA) 4428b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project { 4438b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project /* This inverts the alpha channel in RGBA */ 4448b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (row_info->bit_depth == 8) 4458b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project { 4468b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project png_bytep sp, dp; 4478b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project png_uint_32 i; 4488b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project png_uint_32 row_width = row_info->width; 4498b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project for (i = 0, sp = dp = row; i < row_width; i++) 4508b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project { 451c7702eb5df5f3e72ceedfcd5fb60b94c0a945934David 'Digit' Turner /* Does nothing 4528b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project *(dp++) = *(sp++); 4538b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project *(dp++) = *(sp++); 4548b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project *(dp++) = *(sp++); 4558b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project */ 4568b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project sp+=3; dp = sp; 4578b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project *(dp++) = (png_byte)(255 - *(sp++)); 4588b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 4598b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 4608b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project /* This inverts the alpha channel in RRGGBBAA */ 4618b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project else 4628b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project { 4638b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project png_bytep sp, dp; 4648b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project png_uint_32 i; 4658b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project png_uint_32 row_width = row_info->width; 4668b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 4678b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project for (i = 0, sp = dp = row; i < row_width; i++) 4688b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project { 469c7702eb5df5f3e72ceedfcd5fb60b94c0a945934David 'Digit' Turner /* Does nothing 4708b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project *(dp++) = *(sp++); 4718b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project *(dp++) = *(sp++); 4728b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project *(dp++) = *(sp++); 4738b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project *(dp++) = *(sp++); 4748b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project *(dp++) = *(sp++); 4758b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project *(dp++) = *(sp++); 4768b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project */ 4778b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project sp+=6; dp = sp; 4788b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project *(dp++) = (png_byte)(255 - *(sp++)); 4798b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project *(dp++) = (png_byte)(255 - *(sp++)); 4808b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 4818b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 4828b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 4838b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project else if (row_info->color_type == PNG_COLOR_TYPE_GRAY_ALPHA) 4848b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project { 4858b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project /* This inverts the alpha channel in GA */ 4868b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (row_info->bit_depth == 8) 4878b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project { 4888b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project png_bytep sp, dp; 4898b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project png_uint_32 i; 4908b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project png_uint_32 row_width = row_info->width; 4918b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 4928b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project for (i = 0, sp = dp = row; i < row_width; i++) 4938b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project { 4948b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project *(dp++) = *(sp++); 4958b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project *(dp++) = (png_byte)(255 - *(sp++)); 4968b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 4978b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 4988b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project /* This inverts the alpha channel in GGAA */ 4998b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project else 5008b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project { 5018b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project png_bytep sp, dp; 5028b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project png_uint_32 i; 5038b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project png_uint_32 row_width = row_info->width; 5048b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 5058b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project for (i = 0, sp = dp = row; i < row_width; i++) 5068b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project { 507c7702eb5df5f3e72ceedfcd5fb60b94c0a945934David 'Digit' Turner /* Does nothing 5088b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project *(dp++) = *(sp++); 5098b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project *(dp++) = *(sp++); 5108b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project */ 5118b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project sp+=2; dp = sp; 5128b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project *(dp++) = (png_byte)(255 - *(sp++)); 5138b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project *(dp++) = (png_byte)(255 - *(sp++)); 5148b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 5158b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 5168b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 5178b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 5188b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project} 5198b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#endif 5208b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 521c7702eb5df5f3e72ceedfcd5fb60b94c0a945934David 'Digit' Turner#ifdef PNG_MNG_FEATURES_SUPPORTED 522c7702eb5df5f3e72ceedfcd5fb60b94c0a945934David 'Digit' Turner/* Undoes intrapixel differencing */ 5238b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Projectvoid /* PRIVATE */ 5248b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Projectpng_do_write_intrapixel(png_row_infop row_info, png_bytep row) 5258b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project{ 526c7702eb5df5f3e72ceedfcd5fb60b94c0a945934David 'Digit' Turner png_debug(1, "in png_do_write_intrapixel"); 527c7702eb5df5f3e72ceedfcd5fb60b94c0a945934David 'Digit' Turner 5288b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if ( 529c7702eb5df5f3e72ceedfcd5fb60b94c0a945934David 'Digit' Turner#ifdef PNG_USELESS_TESTS_SUPPORTED 5308b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project row != NULL && row_info != NULL && 5318b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#endif 5328b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project (row_info->color_type & PNG_COLOR_MASK_COLOR)) 5338b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project { 5348b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project int bytes_per_pixel; 5358b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project png_uint_32 row_width = row_info->width; 5368b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (row_info->bit_depth == 8) 5378b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project { 5388b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project png_bytep rp; 5398b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project png_uint_32 i; 5408b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 5418b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (row_info->color_type == PNG_COLOR_TYPE_RGB) 5428b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project bytes_per_pixel = 3; 5438b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project else if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA) 5448b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project bytes_per_pixel = 4; 5458b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project else 5468b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project return; 5478b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 5488b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project for (i = 0, rp = row; i < row_width; i++, rp += bytes_per_pixel) 5498b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project { 5508b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project *(rp) = (png_byte)((*rp - *(rp+1))&0xff); 5518b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project *(rp+2) = (png_byte)((*(rp+2) - *(rp+1))&0xff); 5528b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 5538b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 5548b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project else if (row_info->bit_depth == 16) 5558b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project { 5568b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project png_bytep rp; 5578b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project png_uint_32 i; 5588b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 5598b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (row_info->color_type == PNG_COLOR_TYPE_RGB) 5608b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project bytes_per_pixel = 6; 5618b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project else if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA) 5628b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project bytes_per_pixel = 8; 5638b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project else 5648b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project return; 5658b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 5668b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project for (i = 0, rp = row; i < row_width; i++, rp += bytes_per_pixel) 5678b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project { 5688b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project png_uint_32 s0 = (*(rp ) << 8) | *(rp+1); 5698b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project png_uint_32 s1 = (*(rp+2) << 8) | *(rp+3); 5708b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project png_uint_32 s2 = (*(rp+4) << 8) | *(rp+5); 571c7702eb5df5f3e72ceedfcd5fb60b94c0a945934David 'Digit' Turner png_uint_32 red = (png_uint_32)((s0 - s1) & 0xffffL); 572c7702eb5df5f3e72ceedfcd5fb60b94c0a945934David 'Digit' Turner png_uint_32 blue = (png_uint_32)((s2 - s1) & 0xffffL); 5738b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project *(rp ) = (png_byte)((red >> 8) & 0xff); 5748b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project *(rp+1) = (png_byte)(red & 0xff); 5758b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project *(rp+4) = (png_byte)((blue >> 8) & 0xff); 5768b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project *(rp+5) = (png_byte)(blue & 0xff); 5778b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 5788b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 5798b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 5808b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project} 5818b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#endif /* PNG_MNG_FEATURES_SUPPORTED */ 5828b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#endif /* PNG_WRITE_SUPPORTED */ 583