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 * 48b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * Last changed in libpng 1.2.9 April 14, 2006 58b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * For conditions of distribution and use, see copyright notice in png.h 68b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * Copyright (c) 1998-2006 Glenn Randers-Pehrson 78b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger) 88b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.) 98b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project */ 108b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 118b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#define PNG_INTERNAL 128b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#include "png.h" 138b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#ifdef PNG_WRITE_SUPPORTED 148b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 158b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project/* Transform the data according to the user's wishes. The order of 168b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * transformations is significant. 178b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project */ 188b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Projectvoid /* PRIVATE */ 198b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Projectpng_do_write_transformations(png_structp png_ptr) 208b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project{ 218b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project png_debug(1, "in png_do_write_transformations\n"); 228b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 238b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (png_ptr == NULL) 248b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project return; 258b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 268b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#if defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) 278b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (png_ptr->transformations & PNG_USER_TRANSFORM) 288b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if(png_ptr->write_user_transform_fn != NULL) 298b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project (*(png_ptr->write_user_transform_fn)) /* user write transform function */ 308b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project (png_ptr, /* png_ptr */ 318b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project &(png_ptr->row_info), /* row_info: */ 328b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project /* png_uint_32 width; width of row */ 338b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project /* png_uint_32 rowbytes; number of bytes in row */ 348b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project /* png_byte color_type; color type of pixels */ 358b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project /* png_byte bit_depth; bit depth of samples */ 368b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project /* png_byte channels; number of channels (1-4) */ 378b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project /* png_byte pixel_depth; bits per pixel (depth*channels) */ 388b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project png_ptr->row_buf + 1); /* start of pixel data for row */ 398b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#endif 408b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#if defined(PNG_WRITE_FILLER_SUPPORTED) 418b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (png_ptr->transformations & PNG_FILLER) 428b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project png_do_strip_filler(&(png_ptr->row_info), png_ptr->row_buf + 1, 438b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project png_ptr->flags); 448b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#endif 458b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#if defined(PNG_WRITE_PACKSWAP_SUPPORTED) 468b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (png_ptr->transformations & PNG_PACKSWAP) 478b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project png_do_packswap(&(png_ptr->row_info), png_ptr->row_buf + 1); 488b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#endif 498b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#if defined(PNG_WRITE_PACK_SUPPORTED) 508b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (png_ptr->transformations & PNG_PACK) 518b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project png_do_pack(&(png_ptr->row_info), png_ptr->row_buf + 1, 528b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project (png_uint_32)png_ptr->bit_depth); 538b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#endif 548b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#if defined(PNG_WRITE_SWAP_SUPPORTED) 558b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (png_ptr->transformations & PNG_SWAP_BYTES) 568b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project png_do_swap(&(png_ptr->row_info), png_ptr->row_buf + 1); 578b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#endif 588b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#if defined(PNG_WRITE_SHIFT_SUPPORTED) 598b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (png_ptr->transformations & PNG_SHIFT) 608b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project png_do_shift(&(png_ptr->row_info), png_ptr->row_buf + 1, 618b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project &(png_ptr->shift)); 628b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#endif 638b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#if defined(PNG_WRITE_SWAP_ALPHA_SUPPORTED) 648b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (png_ptr->transformations & PNG_SWAP_ALPHA) 658b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project png_do_write_swap_alpha(&(png_ptr->row_info), png_ptr->row_buf + 1); 668b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#endif 678b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#if defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED) 688b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (png_ptr->transformations & PNG_INVERT_ALPHA) 698b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project png_do_write_invert_alpha(&(png_ptr->row_info), png_ptr->row_buf + 1); 708b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#endif 718b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#if defined(PNG_WRITE_BGR_SUPPORTED) 728b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (png_ptr->transformations & PNG_BGR) 738b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project png_do_bgr(&(png_ptr->row_info), png_ptr->row_buf + 1); 748b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#endif 758b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#if defined(PNG_WRITE_INVERT_SUPPORTED) 768b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (png_ptr->transformations & PNG_INVERT_MONO) 778b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project png_do_invert(&(png_ptr->row_info), png_ptr->row_buf + 1); 788b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#endif 798b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project} 808b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 818b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#if defined(PNG_WRITE_PACK_SUPPORTED) 828b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project/* Pack pixels into bytes. Pass the true bit depth in bit_depth. The 838b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * row_info bit depth should be 8 (one pixel per byte). The channels 848b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * should be 1 (this only happens on grayscale and paletted images). 858b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project */ 868b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Projectvoid /* PRIVATE */ 878b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Projectpng_do_pack(png_row_infop row_info, png_bytep row, png_uint_32 bit_depth) 888b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project{ 898b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project png_debug(1, "in png_do_pack\n"); 908b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (row_info->bit_depth == 8 && 918b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#if defined(PNG_USELESS_TESTS_SUPPORTED) 928b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project row != NULL && row_info != NULL && 938b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#endif 948b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project row_info->channels == 1) 958b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project { 968b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project switch ((int)bit_depth) 978b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project { 988b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project case 1: 998b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project { 1008b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project png_bytep sp, dp; 1018b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project int mask, v; 1028b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project png_uint_32 i; 1038b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project png_uint_32 row_width = row_info->width; 1048b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 1058b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project sp = row; 1068b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project dp = row; 1078b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project mask = 0x80; 1088b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project v = 0; 1098b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 1108b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project for (i = 0; i < row_width; i++) 1118b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project { 1128b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (*sp != 0) 1138b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project v |= mask; 1148b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project sp++; 1158b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (mask > 1) 1168b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project mask >>= 1; 1178b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project else 1188b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project { 1198b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project mask = 0x80; 1208b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project *dp = (png_byte)v; 1218b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project dp++; 1228b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project v = 0; 1238b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 1248b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 1258b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (mask != 0x80) 1268b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project *dp = (png_byte)v; 1278b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project break; 1288b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 1298b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project case 2: 1308b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project { 1318b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project png_bytep sp, dp; 1328b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project int shift, v; 1338b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project png_uint_32 i; 1348b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project png_uint_32 row_width = row_info->width; 1358b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 1368b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project sp = row; 1378b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project dp = row; 1388b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project shift = 6; 1398b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project v = 0; 1408b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project for (i = 0; i < row_width; i++) 1418b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project { 1428b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project png_byte value; 1438b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 1448b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project value = (png_byte)(*sp & 0x03); 1458b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project v |= (value << shift); 1468b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (shift == 0) 1478b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project { 1488b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project shift = 6; 1498b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project *dp = (png_byte)v; 1508b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project dp++; 1518b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project v = 0; 1528b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 1538b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project else 1548b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project shift -= 2; 1558b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project sp++; 1568b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 1578b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (shift != 6) 1588b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project *dp = (png_byte)v; 1598b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project break; 1608b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 1618b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project case 4: 1628b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project { 1638b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project png_bytep sp, dp; 1648b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project int shift, v; 1658b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project png_uint_32 i; 1668b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project png_uint_32 row_width = row_info->width; 1678b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 1688b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project sp = row; 1698b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project dp = row; 1708b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project shift = 4; 1718b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project v = 0; 1728b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project for (i = 0; i < row_width; i++) 1738b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project { 1748b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project png_byte value; 1758b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 1768b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project value = (png_byte)(*sp & 0x0f); 1778b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project v |= (value << shift); 1788b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 1798b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (shift == 0) 1808b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project { 1818b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project shift = 4; 1828b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project *dp = (png_byte)v; 1838b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project dp++; 1848b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project v = 0; 1858b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 1868b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project else 1878b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project shift -= 4; 1888b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 1898b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project sp++; 1908b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 1918b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (shift != 4) 1928b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project *dp = (png_byte)v; 1938b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project break; 1948b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 1958b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 1968b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project row_info->bit_depth = (png_byte)bit_depth; 1978b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project row_info->pixel_depth = (png_byte)(bit_depth * row_info->channels); 1988b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project row_info->rowbytes = PNG_ROWBYTES(row_info->pixel_depth, 1998b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project row_info->width); 2008b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 2018b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project} 2028b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#endif 2038b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 2048b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#if defined(PNG_WRITE_SHIFT_SUPPORTED) 2058b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project/* Shift pixel values to take advantage of whole range. Pass the 2068b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * true number of bits in bit_depth. The row should be packed 2078b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * according to row_info->bit_depth. Thus, if you had a row of 2088b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * bit depth 4, but the pixels only had values from 0 to 7, you 2098b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * would pass 3 as bit_depth, and this routine would translate the 2108b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * data to 0 to 15. 2118b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project */ 2128b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Projectvoid /* PRIVATE */ 2138b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Projectpng_do_shift(png_row_infop row_info, png_bytep row, png_color_8p bit_depth) 2148b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project{ 2158b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project png_debug(1, "in png_do_shift\n"); 2168b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#if defined(PNG_USELESS_TESTS_SUPPORTED) 2178b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (row != NULL && row_info != NULL && 2188b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#else 2198b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if ( 2208b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#endif 2218b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project row_info->color_type != PNG_COLOR_TYPE_PALETTE) 2228b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project { 2238b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project int shift_start[4], shift_dec[4]; 2248b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project int channels = 0; 2258b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 2268b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (row_info->color_type & PNG_COLOR_MASK_COLOR) 2278b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project { 2288b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project shift_start[channels] = row_info->bit_depth - bit_depth->red; 2298b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project shift_dec[channels] = bit_depth->red; 2308b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project channels++; 2318b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project shift_start[channels] = row_info->bit_depth - bit_depth->green; 2328b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project shift_dec[channels] = bit_depth->green; 2338b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project channels++; 2348b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project shift_start[channels] = row_info->bit_depth - bit_depth->blue; 2358b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project shift_dec[channels] = bit_depth->blue; 2368b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project channels++; 2378b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 2388b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project else 2398b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project { 2408b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project shift_start[channels] = row_info->bit_depth - bit_depth->gray; 2418b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project shift_dec[channels] = bit_depth->gray; 2428b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project channels++; 2438b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 2448b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (row_info->color_type & PNG_COLOR_MASK_ALPHA) 2458b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project { 2468b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project shift_start[channels] = row_info->bit_depth - bit_depth->alpha; 2478b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project shift_dec[channels] = bit_depth->alpha; 2488b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project channels++; 2498b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 2508b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 2518b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project /* with low row depths, could only be grayscale, so one channel */ 2528b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (row_info->bit_depth < 8) 2538b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project { 2548b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project png_bytep bp = row; 2558b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project png_uint_32 i; 2568b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project png_byte mask; 2578b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project png_uint_32 row_bytes = row_info->rowbytes; 2588b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 2598b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (bit_depth->gray == 1 && row_info->bit_depth == 2) 2608b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project mask = 0x55; 2618b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project else if (row_info->bit_depth == 4 && bit_depth->gray == 3) 2628b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project mask = 0x11; 2638b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project else 2648b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project mask = 0xff; 2658b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 2668b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project for (i = 0; i < row_bytes; i++, bp++) 2678b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project { 2688b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project png_uint_16 v; 2698b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project int j; 2708b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 2718b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project v = *bp; 2728b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project *bp = 0; 2738b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project for (j = shift_start[0]; j > -shift_dec[0]; j -= shift_dec[0]) 2748b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project { 2758b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (j > 0) 2768b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project *bp |= (png_byte)((v << j) & 0xff); 2778b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project else 2788b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project *bp |= (png_byte)((v >> (-j)) & mask); 2798b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 2808b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 2818b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 2828b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project else if (row_info->bit_depth == 8) 2838b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project { 2848b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project png_bytep bp = row; 2858b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project png_uint_32 i; 2868b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project png_uint_32 istop = channels * row_info->width; 2878b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 2888b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project for (i = 0; i < istop; i++, bp++) 2898b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project { 2908b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 2918b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project png_uint_16 v; 2928b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project int j; 2938b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project int c = (int)(i%channels); 2948b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 2958b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project v = *bp; 2968b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project *bp = 0; 2978b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project for (j = shift_start[c]; j > -shift_dec[c]; j -= shift_dec[c]) 2988b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project { 2998b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (j > 0) 3008b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project *bp |= (png_byte)((v << j) & 0xff); 3018b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project else 3028b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project *bp |= (png_byte)((v >> (-j)) & 0xff); 3038b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 3048b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 3058b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 3068b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project else 3078b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project { 3088b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project png_bytep bp; 3098b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project png_uint_32 i; 3108b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project png_uint_32 istop = channels * row_info->width; 3118b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 3128b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project for (bp = row, i = 0; i < istop; i++) 3138b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project { 3148b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project int c = (int)(i%channels); 3158b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project png_uint_16 value, v; 3168b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project int j; 3178b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 3188b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project v = (png_uint_16)(((png_uint_16)(*bp) << 8) + *(bp + 1)); 3198b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project value = 0; 3208b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project for (j = shift_start[c]; j > -shift_dec[c]; j -= shift_dec[c]) 3218b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project { 3228b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (j > 0) 3238b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project value |= (png_uint_16)((v << j) & (png_uint_16)0xffff); 3248b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project else 3258b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project value |= (png_uint_16)((v >> (-j)) & (png_uint_16)0xffff); 3268b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 3278b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project *bp++ = (png_byte)(value >> 8); 3288b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project *bp++ = (png_byte)(value & 0xff); 3298b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 3308b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 3318b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 3328b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project} 3338b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#endif 3348b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 3358b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#if defined(PNG_WRITE_SWAP_ALPHA_SUPPORTED) 3368b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Projectvoid /* PRIVATE */ 3378b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Projectpng_do_write_swap_alpha(png_row_infop row_info, png_bytep row) 3388b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project{ 3398b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project png_debug(1, "in png_do_write_swap_alpha\n"); 3408b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#if defined(PNG_USELESS_TESTS_SUPPORTED) 3418b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (row != NULL && row_info != NULL) 3428b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#endif 3438b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project { 3448b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA) 3458b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project { 3468b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project /* This converts from ARGB to RGBA */ 3478b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (row_info->bit_depth == 8) 3488b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project { 3498b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project png_bytep sp, dp; 3508b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project png_uint_32 i; 3518b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project png_uint_32 row_width = row_info->width; 3528b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project for (i = 0, sp = dp = row; i < row_width; i++) 3538b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project { 3548b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project png_byte save = *(sp++); 3558b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project *(dp++) = *(sp++); 3568b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project *(dp++) = *(sp++); 3578b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project *(dp++) = *(sp++); 3588b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project *(dp++) = save; 3598b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 3608b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 3618b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project /* This converts from AARRGGBB to RRGGBBAA */ 3628b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project else 3638b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project { 3648b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project png_bytep sp, dp; 3658b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project png_uint_32 i; 3668b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project png_uint_32 row_width = row_info->width; 3678b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 3688b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project for (i = 0, sp = dp = row; i < row_width; i++) 3698b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project { 3708b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project png_byte save[2]; 3718b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project save[0] = *(sp++); 3728b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project save[1] = *(sp++); 3738b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project *(dp++) = *(sp++); 3748b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project *(dp++) = *(sp++); 3758b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project *(dp++) = *(sp++); 3768b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project *(dp++) = *(sp++); 3778b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project *(dp++) = *(sp++); 3788b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project *(dp++) = *(sp++); 3798b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project *(dp++) = save[0]; 3808b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project *(dp++) = save[1]; 3818b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 3828b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 3838b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 3848b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project else if (row_info->color_type == PNG_COLOR_TYPE_GRAY_ALPHA) 3858b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project { 3868b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project /* This converts from AG to GA */ 3878b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (row_info->bit_depth == 8) 3888b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project { 3898b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project png_bytep sp, dp; 3908b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project png_uint_32 i; 3918b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project png_uint_32 row_width = row_info->width; 3928b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 3938b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project for (i = 0, sp = dp = row; i < row_width; i++) 3948b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project { 3958b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project png_byte save = *(sp++); 3968b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project *(dp++) = *(sp++); 3978b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project *(dp++) = save; 3988b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 3998b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 4008b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project /* This converts from AAGG to GGAA */ 4018b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project else 4028b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project { 4038b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project png_bytep sp, dp; 4048b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project png_uint_32 i; 4058b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project png_uint_32 row_width = row_info->width; 4068b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 4078b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project for (i = 0, sp = dp = row; i < row_width; i++) 4088b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project { 4098b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project png_byte save[2]; 4108b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project save[0] = *(sp++); 4118b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project save[1] = *(sp++); 4128b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project *(dp++) = *(sp++); 4138b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project *(dp++) = *(sp++); 4148b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project *(dp++) = save[0]; 4158b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project *(dp++) = save[1]; 4168b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 4178b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 4188b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 4198b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 4208b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project} 4218b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#endif 4228b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 4238b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#if defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED) 4248b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Projectvoid /* PRIVATE */ 4258b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Projectpng_do_write_invert_alpha(png_row_infop row_info, png_bytep row) 4268b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project{ 4278b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project png_debug(1, "in png_do_write_invert_alpha\n"); 4288b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#if defined(PNG_USELESS_TESTS_SUPPORTED) 4298b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (row != NULL && row_info != NULL) 4308b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#endif 4318b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project { 4328b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA) 4338b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project { 4348b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project /* This inverts the alpha channel in RGBA */ 4358b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (row_info->bit_depth == 8) 4368b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project { 4378b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project png_bytep sp, dp; 4388b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project png_uint_32 i; 4398b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project png_uint_32 row_width = row_info->width; 4408b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project for (i = 0, sp = dp = row; i < row_width; i++) 4418b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project { 4428b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project /* does nothing 4438b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project *(dp++) = *(sp++); 4448b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project *(dp++) = *(sp++); 4458b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project *(dp++) = *(sp++); 4468b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project */ 4478b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project sp+=3; dp = sp; 4488b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project *(dp++) = (png_byte)(255 - *(sp++)); 4498b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 4508b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 4518b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project /* This inverts the alpha channel in RRGGBBAA */ 4528b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project else 4538b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project { 4548b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project png_bytep sp, dp; 4558b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project png_uint_32 i; 4568b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project png_uint_32 row_width = row_info->width; 4578b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 4588b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project for (i = 0, sp = dp = row; i < row_width; i++) 4598b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project { 4608b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project /* does nothing 4618b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project *(dp++) = *(sp++); 4628b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project *(dp++) = *(sp++); 4638b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project *(dp++) = *(sp++); 4648b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project *(dp++) = *(sp++); 4658b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project *(dp++) = *(sp++); 4668b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project *(dp++) = *(sp++); 4678b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project */ 4688b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project sp+=6; dp = sp; 4698b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project *(dp++) = (png_byte)(255 - *(sp++)); 4708b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project *(dp++) = (png_byte)(255 - *(sp++)); 4718b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 4728b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 4738b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 4748b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project else if (row_info->color_type == PNG_COLOR_TYPE_GRAY_ALPHA) 4758b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project { 4768b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project /* This inverts the alpha channel in GA */ 4778b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (row_info->bit_depth == 8) 4788b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project { 4798b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project png_bytep sp, dp; 4808b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project png_uint_32 i; 4818b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project png_uint_32 row_width = row_info->width; 4828b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 4838b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project for (i = 0, sp = dp = row; i < row_width; i++) 4848b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project { 4858b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project *(dp++) = *(sp++); 4868b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project *(dp++) = (png_byte)(255 - *(sp++)); 4878b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 4888b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 4898b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project /* This inverts the alpha channel in GGAA */ 4908b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project else 4918b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project { 4928b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project png_bytep sp, dp; 4938b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project png_uint_32 i; 4948b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project png_uint_32 row_width = row_info->width; 4958b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 4968b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project for (i = 0, sp = dp = row; i < row_width; i++) 4978b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project { 4988b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project /* does nothing 4998b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project *(dp++) = *(sp++); 5008b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project *(dp++) = *(sp++); 5018b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project */ 5028b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project sp+=2; dp = sp; 5038b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project *(dp++) = (png_byte)(255 - *(sp++)); 5048b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project *(dp++) = (png_byte)(255 - *(sp++)); 5058b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 5068b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 5078b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 5088b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 5098b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project} 5108b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#endif 5118b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 5128b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#if defined(PNG_MNG_FEATURES_SUPPORTED) 5138b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project/* undoes intrapixel differencing */ 5148b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Projectvoid /* PRIVATE */ 5158b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Projectpng_do_write_intrapixel(png_row_infop row_info, png_bytep row) 5168b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project{ 5178b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project png_debug(1, "in png_do_write_intrapixel\n"); 5188b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if ( 5198b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#if defined(PNG_USELESS_TESTS_SUPPORTED) 5208b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project row != NULL && row_info != NULL && 5218b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#endif 5228b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project (row_info->color_type & PNG_COLOR_MASK_COLOR)) 5238b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project { 5248b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project int bytes_per_pixel; 5258b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project png_uint_32 row_width = row_info->width; 5268b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (row_info->bit_depth == 8) 5278b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project { 5288b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project png_bytep rp; 5298b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project png_uint_32 i; 5308b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 5318b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (row_info->color_type == PNG_COLOR_TYPE_RGB) 5328b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project bytes_per_pixel = 3; 5338b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project else if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA) 5348b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project bytes_per_pixel = 4; 5358b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project else 5368b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project return; 5378b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 5388b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project for (i = 0, rp = row; i < row_width; i++, rp += bytes_per_pixel) 5398b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project { 5408b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project *(rp) = (png_byte)((*rp - *(rp+1))&0xff); 5418b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project *(rp+2) = (png_byte)((*(rp+2) - *(rp+1))&0xff); 5428b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 5438b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 5448b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project else if (row_info->bit_depth == 16) 5458b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project { 5468b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project png_bytep rp; 5478b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project png_uint_32 i; 5488b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 5498b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project if (row_info->color_type == PNG_COLOR_TYPE_RGB) 5508b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project bytes_per_pixel = 6; 5518b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project else if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA) 5528b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project bytes_per_pixel = 8; 5538b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project else 5548b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project return; 5558b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 5568b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project for (i = 0, rp = row; i < row_width; i++, rp += bytes_per_pixel) 5578b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project { 5588b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project png_uint_32 s0 = (*(rp ) << 8) | *(rp+1); 5598b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project png_uint_32 s1 = (*(rp+2) << 8) | *(rp+3); 5608b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project png_uint_32 s2 = (*(rp+4) << 8) | *(rp+5); 5618b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project png_uint_32 red = (png_uint_32)((s0-s1) & 0xffffL); 5628b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project png_uint_32 blue = (png_uint_32)((s2-s1) & 0xffffL); 5638b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project *(rp ) = (png_byte)((red >> 8) & 0xff); 5648b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project *(rp+1) = (png_byte)(red & 0xff); 5658b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project *(rp+4) = (png_byte)((blue >> 8) & 0xff); 5668b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project *(rp+5) = (png_byte)(blue & 0xff); 5678b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 5688b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 5698b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project } 5708b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project} 5718b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#endif /* PNG_MNG_FEATURES_SUPPORTED */ 5728b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#endif /* PNG_WRITE_SUPPORTED */ 573