Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2 | /* pngtrans.c - transforms the data in a row (used by both readers and writers) |
Glenn Randers-Pehrson | b6ce43d | 1998-01-01 07:13:13 -0600 | [diff] [blame] | 3 | * |
Glenn Randers-Pehrson | 51d9250 | 2002-08-23 23:07:42 -0500 | [diff] [blame^] | 4 | * libpng 1.2.5rc1 - August 24, 2002 |
Glenn Randers-Pehrson | b6ce43d | 1998-01-01 07:13:13 -0600 | [diff] [blame] | 5 | * For conditions of distribution and use, see copyright notice in png.h |
Glenn Randers-Pehrson | c6de22d | 2002-02-23 18:55:25 -0600 | [diff] [blame] | 6 | * Copyright (c) 1998-2002 Glenn Randers-Pehrson |
Glenn Randers-Pehrson | d436672 | 2000-06-04 14:29:29 -0500 | [diff] [blame] | 7 | * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger) |
| 8 | * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.) |
Glenn Randers-Pehrson | b6ce43d | 1998-01-01 07:13:13 -0600 | [diff] [blame] | 9 | */ |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 10 | |
| 11 | #define PNG_INTERNAL |
| 12 | #include "png.h" |
| 13 | |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 14 | #if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED) |
Glenn Randers-Pehrson | 352ca6b | 1999-09-18 15:49:20 -0500 | [diff] [blame] | 15 | /* turn on BGR-to-RGB mapping */ |
Glenn Randers-Pehrson | 7529457 | 2000-05-06 14:09:57 -0500 | [diff] [blame] | 16 | void PNGAPI |
Guy Schalnat | 6d76471 | 1995-12-19 03:22:19 -0600 | [diff] [blame] | 17 | png_set_bgr(png_structp png_ptr) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 18 | { |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 19 | png_debug(1, "in png_set_bgr\n"); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 20 | png_ptr->transformations |= PNG_BGR; |
| 21 | } |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 22 | #endif |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 23 | |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 24 | #if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 25 | /* turn on 16 bit byte swapping */ |
Glenn Randers-Pehrson | 7529457 | 2000-05-06 14:09:57 -0500 | [diff] [blame] | 26 | void PNGAPI |
Guy Schalnat | 6d76471 | 1995-12-19 03:22:19 -0600 | [diff] [blame] | 27 | png_set_swap(png_structp png_ptr) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 28 | { |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 29 | png_debug(1, "in png_set_swap\n"); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 30 | if (png_ptr->bit_depth == 16) |
| 31 | png_ptr->transformations |= PNG_SWAP_BYTES; |
| 32 | } |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 33 | #endif |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 34 | |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 35 | #if defined(PNG_READ_PACK_SUPPORTED) || defined(PNG_WRITE_PACK_SUPPORTED) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 36 | /* turn on pixel packing */ |
Glenn Randers-Pehrson | 7529457 | 2000-05-06 14:09:57 -0500 | [diff] [blame] | 37 | void PNGAPI |
Guy Schalnat | 6d76471 | 1995-12-19 03:22:19 -0600 | [diff] [blame] | 38 | png_set_packing(png_structp png_ptr) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 39 | { |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 40 | png_debug(1, "in png_set_packing\n"); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 41 | if (png_ptr->bit_depth < 8) |
| 42 | { |
| 43 | png_ptr->transformations |= PNG_PACK; |
| 44 | png_ptr->usr_bit_depth = 8; |
| 45 | } |
| 46 | } |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 47 | #endif |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 48 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 49 | #if defined(PNG_READ_PACKSWAP_SUPPORTED)||defined(PNG_WRITE_PACKSWAP_SUPPORTED) |
| 50 | /* turn on packed pixel swapping */ |
Glenn Randers-Pehrson | 7529457 | 2000-05-06 14:09:57 -0500 | [diff] [blame] | 51 | void PNGAPI |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 52 | png_set_packswap(png_structp png_ptr) |
| 53 | { |
| 54 | png_debug(1, "in png_set_packswap\n"); |
| 55 | if (png_ptr->bit_depth < 8) |
| 56 | png_ptr->transformations |= PNG_PACKSWAP; |
| 57 | } |
| 58 | #endif |
| 59 | |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 60 | #if defined(PNG_READ_SHIFT_SUPPORTED) || defined(PNG_WRITE_SHIFT_SUPPORTED) |
Glenn Randers-Pehrson | 7529457 | 2000-05-06 14:09:57 -0500 | [diff] [blame] | 61 | void PNGAPI |
Guy Schalnat | 6d76471 | 1995-12-19 03:22:19 -0600 | [diff] [blame] | 62 | png_set_shift(png_structp png_ptr, png_color_8p true_bits) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 63 | { |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 64 | png_debug(1, "in png_set_shift\n"); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 65 | png_ptr->transformations |= PNG_SHIFT; |
| 66 | png_ptr->shift = *true_bits; |
| 67 | } |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 68 | #endif |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 69 | |
Glenn Randers-Pehrson | 46f61e2 | 1998-01-30 21:45:12 -0600 | [diff] [blame] | 70 | #if defined(PNG_READ_INTERLACING_SUPPORTED) || \ |
| 71 | defined(PNG_WRITE_INTERLACING_SUPPORTED) |
Glenn Randers-Pehrson | 7529457 | 2000-05-06 14:09:57 -0500 | [diff] [blame] | 72 | int PNGAPI |
Guy Schalnat | 6d76471 | 1995-12-19 03:22:19 -0600 | [diff] [blame] | 73 | png_set_interlace_handling(png_structp png_ptr) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 74 | { |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 75 | png_debug(1, "in png_set_interlace handling\n"); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 76 | if (png_ptr->interlaced) |
| 77 | { |
| 78 | png_ptr->transformations |= PNG_INTERLACE; |
Glenn Randers-Pehrson | b212002 | 1998-01-31 20:07:59 -0600 | [diff] [blame] | 79 | return (7); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 80 | } |
| 81 | |
Glenn Randers-Pehrson | b212002 | 1998-01-31 20:07:59 -0600 | [diff] [blame] | 82 | return (1); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 83 | } |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 84 | #endif |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 85 | |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 86 | #if defined(PNG_READ_FILLER_SUPPORTED) || defined(PNG_WRITE_FILLER_SUPPORTED) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 87 | /* Add a filler byte on read, or remove a filler or alpha byte on write. |
| 88 | * The filler type has changed in v0.95 to allow future 2-byte fillers |
Glenn Randers-Pehrson | 8686fff | 1998-05-21 09:27:50 -0500 | [diff] [blame] | 89 | * for 48-bit input data, as well as to avoid problems with some compilers |
| 90 | * that don't like bytes as parameters. |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 91 | */ |
Glenn Randers-Pehrson | 7529457 | 2000-05-06 14:09:57 -0500 | [diff] [blame] | 92 | void PNGAPI |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 93 | png_set_filler(png_structp png_ptr, png_uint_32 filler, int filler_loc) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 94 | { |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 95 | png_debug(1, "in png_set_filler\n"); |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 96 | png_ptr->transformations |= PNG_FILLER; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 97 | png_ptr->filler = (png_byte)filler; |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 98 | if (filler_loc == PNG_FILLER_AFTER) |
| 99 | png_ptr->flags |= PNG_FLAG_FILLER_AFTER; |
| 100 | else |
| 101 | png_ptr->flags &= ~PNG_FLAG_FILLER_AFTER; |
Glenn Randers-Pehrson | 5c6aeb2 | 1998-12-29 11:47:59 -0600 | [diff] [blame] | 102 | |
| 103 | /* This should probably go in the "do_filler" routine. |
| 104 | * I attempted to do that in libpng-1.0.1a but that caused problems |
| 105 | * so I restored it in libpng-1.0.2a |
| 106 | */ |
| 107 | |
| 108 | if (png_ptr->color_type == PNG_COLOR_TYPE_RGB) |
| 109 | { |
| 110 | png_ptr->usr_channels = 4; |
| 111 | } |
| 112 | |
| 113 | /* Also I added this in libpng-1.0.2a (what happens when we expand |
| 114 | * a less-than-8-bit grayscale to GA? */ |
| 115 | |
| 116 | if (png_ptr->color_type == PNG_COLOR_TYPE_GRAY && png_ptr->bit_depth >= 8) |
| 117 | { |
| 118 | png_ptr->usr_channels = 2; |
| 119 | } |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 120 | } |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 121 | #endif |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 122 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 123 | #if defined(PNG_READ_SWAP_ALPHA_SUPPORTED) || \ |
| 124 | defined(PNG_WRITE_SWAP_ALPHA_SUPPORTED) |
Glenn Randers-Pehrson | 7529457 | 2000-05-06 14:09:57 -0500 | [diff] [blame] | 125 | void PNGAPI |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 126 | png_set_swap_alpha(png_structp png_ptr) |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 127 | { |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 128 | png_debug(1, "in png_set_swap_alpha\n"); |
| 129 | png_ptr->transformations |= PNG_SWAP_ALPHA; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 130 | } |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 131 | #endif |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 132 | |
Glenn Randers-Pehrson | c4a2ae6 | 1998-01-16 22:06:18 -0600 | [diff] [blame] | 133 | #if defined(PNG_READ_INVERT_ALPHA_SUPPORTED) || \ |
| 134 | defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED) |
Glenn Randers-Pehrson | 7529457 | 2000-05-06 14:09:57 -0500 | [diff] [blame] | 135 | void PNGAPI |
Glenn Randers-Pehrson | c4a2ae6 | 1998-01-16 22:06:18 -0600 | [diff] [blame] | 136 | png_set_invert_alpha(png_structp png_ptr) |
| 137 | { |
| 138 | png_debug(1, "in png_set_invert_alpha\n"); |
| 139 | png_ptr->transformations |= PNG_INVERT_ALPHA; |
| 140 | } |
| 141 | #endif |
| 142 | |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 143 | #if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED) |
Glenn Randers-Pehrson | 7529457 | 2000-05-06 14:09:57 -0500 | [diff] [blame] | 144 | void PNGAPI |
Guy Schalnat | 6d76471 | 1995-12-19 03:22:19 -0600 | [diff] [blame] | 145 | png_set_invert_mono(png_structp png_ptr) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 146 | { |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 147 | png_debug(1, "in png_set_invert_mono\n"); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 148 | png_ptr->transformations |= PNG_INVERT_MONO; |
| 149 | } |
| 150 | |
Glenn Randers-Pehrson | 345bc27 | 1998-06-14 14:43:31 -0500 | [diff] [blame] | 151 | /* invert monochrome grayscale data */ |
Glenn Randers-Pehrson | 7529457 | 2000-05-06 14:09:57 -0500 | [diff] [blame] | 152 | void /* PRIVATE */ |
Guy Schalnat | 6d76471 | 1995-12-19 03:22:19 -0600 | [diff] [blame] | 153 | png_do_invert(png_row_infop row_info, png_bytep row) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 154 | { |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 155 | png_debug(1, "in png_do_invert\n"); |
Glenn Randers-Pehrson | 1ea0ff3 | 2001-08-07 22:25:59 -0500 | [diff] [blame] | 156 | /* This test removed from libpng version 1.0.13 and 1.2.0: |
| 157 | * if (row_info->bit_depth == 1 && |
| 158 | */ |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 159 | #if defined(PNG_USELESS_TESTS_SUPPORTED) |
Glenn Randers-Pehrson | 1ea0ff3 | 2001-08-07 22:25:59 -0500 | [diff] [blame] | 160 | if (row == NULL || row_info == NULL) |
| 161 | return; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 162 | #endif |
Glenn Randers-Pehrson | 1ea0ff3 | 2001-08-07 22:25:59 -0500 | [diff] [blame] | 163 | if (row_info->color_type == PNG_COLOR_TYPE_GRAY) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 164 | { |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 165 | png_bytep rp = row; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 166 | png_uint_32 i; |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 167 | png_uint_32 istop = row_info->rowbytes; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 168 | |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 169 | for (i = 0; i < istop; i++) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 170 | { |
Glenn Randers-Pehrson | 8686fff | 1998-05-21 09:27:50 -0500 | [diff] [blame] | 171 | *rp = (png_byte)(~(*rp)); |
| 172 | rp++; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 173 | } |
| 174 | } |
Glenn Randers-Pehrson | 1ea0ff3 | 2001-08-07 22:25:59 -0500 | [diff] [blame] | 175 | else if (row_info->color_type == PNG_COLOR_TYPE_GRAY_ALPHA && |
| 176 | row_info->bit_depth == 8) |
| 177 | { |
| 178 | png_bytep rp = row; |
| 179 | png_uint_32 i; |
| 180 | png_uint_32 istop = row_info->rowbytes; |
| 181 | |
| 182 | for (i = 0; i < istop; i+=2) |
| 183 | { |
| 184 | *rp = (png_byte)(~(*rp)); |
| 185 | rp+=2; |
| 186 | } |
| 187 | } |
| 188 | else if (row_info->color_type == PNG_COLOR_TYPE_GRAY_ALPHA && |
| 189 | row_info->bit_depth == 16) |
| 190 | { |
| 191 | png_bytep rp = row; |
| 192 | png_uint_32 i; |
| 193 | png_uint_32 istop = row_info->rowbytes; |
| 194 | |
| 195 | for (i = 0; i < istop; i+=4) |
| 196 | { |
| 197 | *rp = (png_byte)(~(*rp)); |
| 198 | *(rp+1) = (png_byte)(~(*(rp+1))); |
| 199 | rp+=4; |
| 200 | } |
| 201 | } |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 202 | } |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 203 | #endif |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 204 | |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 205 | #if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 206 | /* swaps byte order on 16 bit depth images */ |
Glenn Randers-Pehrson | 7529457 | 2000-05-06 14:09:57 -0500 | [diff] [blame] | 207 | void /* PRIVATE */ |
Guy Schalnat | 6d76471 | 1995-12-19 03:22:19 -0600 | [diff] [blame] | 208 | png_do_swap(png_row_infop row_info, png_bytep row) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 209 | { |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 210 | png_debug(1, "in png_do_swap\n"); |
| 211 | if ( |
| 212 | #if defined(PNG_USELESS_TESTS_SUPPORTED) |
| 213 | row != NULL && row_info != NULL && |
| 214 | #endif |
| 215 | row_info->bit_depth == 16) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 216 | { |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 217 | png_bytep rp = row; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 218 | png_uint_32 i; |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 219 | png_uint_32 istop= row_info->width * row_info->channels; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 220 | |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 221 | for (i = 0; i < istop; i++, rp += 2) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 222 | { |
Glenn Randers-Pehrson | 896239b | 1998-04-21 15:03:57 -0500 | [diff] [blame] | 223 | png_byte t = *rp; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 224 | *rp = *(rp + 1); |
| 225 | *(rp + 1) = t; |
| 226 | } |
| 227 | } |
| 228 | } |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 229 | #endif |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 230 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 231 | #if defined(PNG_READ_PACKSWAP_SUPPORTED)||defined(PNG_WRITE_PACKSWAP_SUPPORTED) |
| 232 | static png_byte onebppswaptable[256] = { |
| 233 | 0x00, 0x80, 0x40, 0xC0, 0x20, 0xA0, 0x60, 0xE0, |
| 234 | 0x10, 0x90, 0x50, 0xD0, 0x30, 0xB0, 0x70, 0xF0, |
| 235 | 0x08, 0x88, 0x48, 0xC8, 0x28, 0xA8, 0x68, 0xE8, |
| 236 | 0x18, 0x98, 0x58, 0xD8, 0x38, 0xB8, 0x78, 0xF8, |
| 237 | 0x04, 0x84, 0x44, 0xC4, 0x24, 0xA4, 0x64, 0xE4, |
| 238 | 0x14, 0x94, 0x54, 0xD4, 0x34, 0xB4, 0x74, 0xF4, |
| 239 | 0x0C, 0x8C, 0x4C, 0xCC, 0x2C, 0xAC, 0x6C, 0xEC, |
| 240 | 0x1C, 0x9C, 0x5C, 0xDC, 0x3C, 0xBC, 0x7C, 0xFC, |
| 241 | 0x02, 0x82, 0x42, 0xC2, 0x22, 0xA2, 0x62, 0xE2, |
| 242 | 0x12, 0x92, 0x52, 0xD2, 0x32, 0xB2, 0x72, 0xF2, |
| 243 | 0x0A, 0x8A, 0x4A, 0xCA, 0x2A, 0xAA, 0x6A, 0xEA, |
| 244 | 0x1A, 0x9A, 0x5A, 0xDA, 0x3A, 0xBA, 0x7A, 0xFA, |
| 245 | 0x06, 0x86, 0x46, 0xC6, 0x26, 0xA6, 0x66, 0xE6, |
| 246 | 0x16, 0x96, 0x56, 0xD6, 0x36, 0xB6, 0x76, 0xF6, |
| 247 | 0x0E, 0x8E, 0x4E, 0xCE, 0x2E, 0xAE, 0x6E, 0xEE, |
| 248 | 0x1E, 0x9E, 0x5E, 0xDE, 0x3E, 0xBE, 0x7E, 0xFE, |
| 249 | 0x01, 0x81, 0x41, 0xC1, 0x21, 0xA1, 0x61, 0xE1, |
| 250 | 0x11, 0x91, 0x51, 0xD1, 0x31, 0xB1, 0x71, 0xF1, |
| 251 | 0x09, 0x89, 0x49, 0xC9, 0x29, 0xA9, 0x69, 0xE9, |
| 252 | 0x19, 0x99, 0x59, 0xD9, 0x39, 0xB9, 0x79, 0xF9, |
| 253 | 0x05, 0x85, 0x45, 0xC5, 0x25, 0xA5, 0x65, 0xE5, |
| 254 | 0x15, 0x95, 0x55, 0xD5, 0x35, 0xB5, 0x75, 0xF5, |
| 255 | 0x0D, 0x8D, 0x4D, 0xCD, 0x2D, 0xAD, 0x6D, 0xED, |
| 256 | 0x1D, 0x9D, 0x5D, 0xDD, 0x3D, 0xBD, 0x7D, 0xFD, |
| 257 | 0x03, 0x83, 0x43, 0xC3, 0x23, 0xA3, 0x63, 0xE3, |
| 258 | 0x13, 0x93, 0x53, 0xD3, 0x33, 0xB3, 0x73, 0xF3, |
| 259 | 0x0B, 0x8B, 0x4B, 0xCB, 0x2B, 0xAB, 0x6B, 0xEB, |
| 260 | 0x1B, 0x9B, 0x5B, 0xDB, 0x3B, 0xBB, 0x7B, 0xFB, |
| 261 | 0x07, 0x87, 0x47, 0xC7, 0x27, 0xA7, 0x67, 0xE7, |
| 262 | 0x17, 0x97, 0x57, 0xD7, 0x37, 0xB7, 0x77, 0xF7, |
| 263 | 0x0F, 0x8F, 0x4F, 0xCF, 0x2F, 0xAF, 0x6F, 0xEF, |
| 264 | 0x1F, 0x9F, 0x5F, 0xDF, 0x3F, 0xBF, 0x7F, 0xFF |
| 265 | }; |
| 266 | |
| 267 | static png_byte twobppswaptable[256] = { |
| 268 | 0x00, 0x40, 0x80, 0xC0, 0x10, 0x50, 0x90, 0xD0, |
| 269 | 0x20, 0x60, 0xA0, 0xE0, 0x30, 0x70, 0xB0, 0xF0, |
| 270 | 0x04, 0x44, 0x84, 0xC4, 0x14, 0x54, 0x94, 0xD4, |
| 271 | 0x24, 0x64, 0xA4, 0xE4, 0x34, 0x74, 0xB4, 0xF4, |
| 272 | 0x08, 0x48, 0x88, 0xC8, 0x18, 0x58, 0x98, 0xD8, |
| 273 | 0x28, 0x68, 0xA8, 0xE8, 0x38, 0x78, 0xB8, 0xF8, |
| 274 | 0x0C, 0x4C, 0x8C, 0xCC, 0x1C, 0x5C, 0x9C, 0xDC, |
| 275 | 0x2C, 0x6C, 0xAC, 0xEC, 0x3C, 0x7C, 0xBC, 0xFC, |
| 276 | 0x01, 0x41, 0x81, 0xC1, 0x11, 0x51, 0x91, 0xD1, |
| 277 | 0x21, 0x61, 0xA1, 0xE1, 0x31, 0x71, 0xB1, 0xF1, |
| 278 | 0x05, 0x45, 0x85, 0xC5, 0x15, 0x55, 0x95, 0xD5, |
| 279 | 0x25, 0x65, 0xA5, 0xE5, 0x35, 0x75, 0xB5, 0xF5, |
| 280 | 0x09, 0x49, 0x89, 0xC9, 0x19, 0x59, 0x99, 0xD9, |
| 281 | 0x29, 0x69, 0xA9, 0xE9, 0x39, 0x79, 0xB9, 0xF9, |
| 282 | 0x0D, 0x4D, 0x8D, 0xCD, 0x1D, 0x5D, 0x9D, 0xDD, |
| 283 | 0x2D, 0x6D, 0xAD, 0xED, 0x3D, 0x7D, 0xBD, 0xFD, |
| 284 | 0x02, 0x42, 0x82, 0xC2, 0x12, 0x52, 0x92, 0xD2, |
| 285 | 0x22, 0x62, 0xA2, 0xE2, 0x32, 0x72, 0xB2, 0xF2, |
| 286 | 0x06, 0x46, 0x86, 0xC6, 0x16, 0x56, 0x96, 0xD6, |
| 287 | 0x26, 0x66, 0xA6, 0xE6, 0x36, 0x76, 0xB6, 0xF6, |
| 288 | 0x0A, 0x4A, 0x8A, 0xCA, 0x1A, 0x5A, 0x9A, 0xDA, |
| 289 | 0x2A, 0x6A, 0xAA, 0xEA, 0x3A, 0x7A, 0xBA, 0xFA, |
| 290 | 0x0E, 0x4E, 0x8E, 0xCE, 0x1E, 0x5E, 0x9E, 0xDE, |
| 291 | 0x2E, 0x6E, 0xAE, 0xEE, 0x3E, 0x7E, 0xBE, 0xFE, |
| 292 | 0x03, 0x43, 0x83, 0xC3, 0x13, 0x53, 0x93, 0xD3, |
| 293 | 0x23, 0x63, 0xA3, 0xE3, 0x33, 0x73, 0xB3, 0xF3, |
| 294 | 0x07, 0x47, 0x87, 0xC7, 0x17, 0x57, 0x97, 0xD7, |
| 295 | 0x27, 0x67, 0xA7, 0xE7, 0x37, 0x77, 0xB7, 0xF7, |
| 296 | 0x0B, 0x4B, 0x8B, 0xCB, 0x1B, 0x5B, 0x9B, 0xDB, |
| 297 | 0x2B, 0x6B, 0xAB, 0xEB, 0x3B, 0x7B, 0xBB, 0xFB, |
| 298 | 0x0F, 0x4F, 0x8F, 0xCF, 0x1F, 0x5F, 0x9F, 0xDF, |
| 299 | 0x2F, 0x6F, 0xAF, 0xEF, 0x3F, 0x7F, 0xBF, 0xFF |
| 300 | }; |
| 301 | |
| 302 | static png_byte fourbppswaptable[256] = { |
| 303 | 0x00, 0x10, 0x20, 0x30, 0x40, 0x50, 0x60, 0x70, |
| 304 | 0x80, 0x90, 0xA0, 0xB0, 0xC0, 0xD0, 0xE0, 0xF0, |
| 305 | 0x01, 0x11, 0x21, 0x31, 0x41, 0x51, 0x61, 0x71, |
| 306 | 0x81, 0x91, 0xA1, 0xB1, 0xC1, 0xD1, 0xE1, 0xF1, |
| 307 | 0x02, 0x12, 0x22, 0x32, 0x42, 0x52, 0x62, 0x72, |
| 308 | 0x82, 0x92, 0xA2, 0xB2, 0xC2, 0xD2, 0xE2, 0xF2, |
| 309 | 0x03, 0x13, 0x23, 0x33, 0x43, 0x53, 0x63, 0x73, |
| 310 | 0x83, 0x93, 0xA3, 0xB3, 0xC3, 0xD3, 0xE3, 0xF3, |
| 311 | 0x04, 0x14, 0x24, 0x34, 0x44, 0x54, 0x64, 0x74, |
| 312 | 0x84, 0x94, 0xA4, 0xB4, 0xC4, 0xD4, 0xE4, 0xF4, |
| 313 | 0x05, 0x15, 0x25, 0x35, 0x45, 0x55, 0x65, 0x75, |
| 314 | 0x85, 0x95, 0xA5, 0xB5, 0xC5, 0xD5, 0xE5, 0xF5, |
| 315 | 0x06, 0x16, 0x26, 0x36, 0x46, 0x56, 0x66, 0x76, |
| 316 | 0x86, 0x96, 0xA6, 0xB6, 0xC6, 0xD6, 0xE6, 0xF6, |
| 317 | 0x07, 0x17, 0x27, 0x37, 0x47, 0x57, 0x67, 0x77, |
| 318 | 0x87, 0x97, 0xA7, 0xB7, 0xC7, 0xD7, 0xE7, 0xF7, |
| 319 | 0x08, 0x18, 0x28, 0x38, 0x48, 0x58, 0x68, 0x78, |
| 320 | 0x88, 0x98, 0xA8, 0xB8, 0xC8, 0xD8, 0xE8, 0xF8, |
| 321 | 0x09, 0x19, 0x29, 0x39, 0x49, 0x59, 0x69, 0x79, |
| 322 | 0x89, 0x99, 0xA9, 0xB9, 0xC9, 0xD9, 0xE9, 0xF9, |
| 323 | 0x0A, 0x1A, 0x2A, 0x3A, 0x4A, 0x5A, 0x6A, 0x7A, |
| 324 | 0x8A, 0x9A, 0xAA, 0xBA, 0xCA, 0xDA, 0xEA, 0xFA, |
| 325 | 0x0B, 0x1B, 0x2B, 0x3B, 0x4B, 0x5B, 0x6B, 0x7B, |
| 326 | 0x8B, 0x9B, 0xAB, 0xBB, 0xCB, 0xDB, 0xEB, 0xFB, |
| 327 | 0x0C, 0x1C, 0x2C, 0x3C, 0x4C, 0x5C, 0x6C, 0x7C, |
| 328 | 0x8C, 0x9C, 0xAC, 0xBC, 0xCC, 0xDC, 0xEC, 0xFC, |
| 329 | 0x0D, 0x1D, 0x2D, 0x3D, 0x4D, 0x5D, 0x6D, 0x7D, |
| 330 | 0x8D, 0x9D, 0xAD, 0xBD, 0xCD, 0xDD, 0xED, 0xFD, |
| 331 | 0x0E, 0x1E, 0x2E, 0x3E, 0x4E, 0x5E, 0x6E, 0x7E, |
| 332 | 0x8E, 0x9E, 0xAE, 0xBE, 0xCE, 0xDE, 0xEE, 0xFE, |
| 333 | 0x0F, 0x1F, 0x2F, 0x3F, 0x4F, 0x5F, 0x6F, 0x7F, |
| 334 | 0x8F, 0x9F, 0xAF, 0xBF, 0xCF, 0xDF, 0xEF, 0xFF |
| 335 | }; |
| 336 | |
| 337 | /* swaps pixel packing order within bytes */ |
Glenn Randers-Pehrson | 7529457 | 2000-05-06 14:09:57 -0500 | [diff] [blame] | 338 | void /* PRIVATE */ |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 339 | png_do_packswap(png_row_infop row_info, png_bytep row) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 340 | { |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 341 | png_debug(1, "in png_do_packswap\n"); |
| 342 | if ( |
| 343 | #if defined(PNG_USELESS_TESTS_SUPPORTED) |
Glenn Randers-Pehrson | 46f61e2 | 1998-01-30 21:45:12 -0600 | [diff] [blame] | 344 | row != NULL && row_info != NULL && |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 345 | #endif |
| 346 | row_info->bit_depth < 8) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 347 | { |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 348 | png_bytep rp, end, table; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 349 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 350 | end = row + row_info->rowbytes; |
| 351 | |
| 352 | if (row_info->bit_depth == 1) |
| 353 | table = onebppswaptable; |
| 354 | else if (row_info->bit_depth == 2) |
| 355 | table = twobppswaptable; |
| 356 | else if (row_info->bit_depth == 4) |
| 357 | table = fourbppswaptable; |
| 358 | else |
| 359 | return; |
| 360 | |
| 361 | for (rp = row; rp < end; rp++) |
| 362 | *rp = table[*rp]; |
| 363 | } |
| 364 | } |
| 365 | #endif /* PNG_READ_PACKSWAP_SUPPORTED or PNG_WRITE_PACKSWAP_SUPPORTED */ |
| 366 | |
| 367 | #if defined(PNG_WRITE_FILLER_SUPPORTED) || \ |
| 368 | defined(PNG_READ_STRIP_ALPHA_SUPPORTED) |
| 369 | /* remove filler or alpha byte(s) */ |
Glenn Randers-Pehrson | 7529457 | 2000-05-06 14:09:57 -0500 | [diff] [blame] | 370 | void /* PRIVATE */ |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 371 | png_do_strip_filler(png_row_infop row_info, png_bytep row, png_uint_32 flags) |
| 372 | { |
| 373 | png_debug(1, "in png_do_strip_filler\n"); |
| 374 | #if defined(PNG_USELESS_TESTS_SUPPORTED) |
| 375 | if (row != NULL && row_info != NULL) |
| 376 | #endif |
| 377 | { |
| 378 | /* |
| 379 | if (row_info->color_type == PNG_COLOR_TYPE_RGB || |
| 380 | row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA) |
| 381 | */ |
Glenn Randers-Pehrson | 896239b | 1998-04-21 15:03:57 -0500 | [diff] [blame] | 382 | png_bytep sp=row; |
| 383 | png_bytep dp=row; |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 384 | png_uint_32 row_width=row_info->width; |
Glenn Randers-Pehrson | 896239b | 1998-04-21 15:03:57 -0500 | [diff] [blame] | 385 | png_uint_32 i; |
| 386 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 387 | if (row_info->channels == 4) |
| 388 | { |
| 389 | if (row_info->bit_depth == 8) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 390 | { |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 391 | /* This converts from RGBX or RGBA to RGB */ |
| 392 | if (flags & PNG_FLAG_FILLER_AFTER) |
| 393 | { |
Glenn Randers-Pehrson | 896239b | 1998-04-21 15:03:57 -0500 | [diff] [blame] | 394 | dp+=3; sp+=4; |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 395 | for (i = 1; i < row_width; i++) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 396 | { |
| 397 | *dp++ = *sp++; |
| 398 | *dp++ = *sp++; |
| 399 | *dp++ = *sp++; |
| 400 | sp++; |
| 401 | } |
| 402 | } |
| 403 | /* This converts from XRGB or ARGB to RGB */ |
| 404 | else |
| 405 | { |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 406 | for (i = 0; i < row_width; i++) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 407 | { |
| 408 | sp++; |
| 409 | *dp++ = *sp++; |
| 410 | *dp++ = *sp++; |
| 411 | *dp++ = *sp++; |
| 412 | } |
| 413 | } |
| 414 | row_info->pixel_depth = 24; |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 415 | row_info->rowbytes = row_width * 3; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 416 | } |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 417 | else /* if (row_info->bit_depth == 16) */ |
| 418 | { |
| 419 | if (flags & PNG_FLAG_FILLER_AFTER) |
| 420 | { |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 421 | /* This converts from RRGGBBXX or RRGGBBAA to RRGGBB */ |
Glenn Randers-Pehrson | 896239b | 1998-04-21 15:03:57 -0500 | [diff] [blame] | 422 | sp += 8; dp += 6; |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 423 | for (i = 1; i < row_width; i++) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 424 | { |
Glenn Randers-Pehrson | 3097f61 | 2001-05-07 14:52:45 -0500 | [diff] [blame] | 425 | /* This could be (although png_memcpy is probably slower): |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 426 | png_memcpy(dp, sp, 6); |
| 427 | sp += 8; |
| 428 | dp += 6; |
| 429 | */ |
Glenn Randers-Pehrson | 3097f61 | 2001-05-07 14:52:45 -0500 | [diff] [blame] | 430 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 431 | *dp++ = *sp++; |
| 432 | *dp++ = *sp++; |
| 433 | *dp++ = *sp++; |
| 434 | *dp++ = *sp++; |
| 435 | *dp++ = *sp++; |
| 436 | *dp++ = *sp++; |
| 437 | sp += 2; |
| 438 | } |
| 439 | } |
| 440 | else |
| 441 | { |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 442 | /* This converts from XXRRGGBB or AARRGGBB to RRGGBB */ |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 443 | for (i = 0; i < row_width; i++) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 444 | { |
Glenn Randers-Pehrson | 3097f61 | 2001-05-07 14:52:45 -0500 | [diff] [blame] | 445 | /* This could be (although png_memcpy is probably slower): |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 446 | png_memcpy(dp, sp, 6); |
| 447 | sp += 8; |
| 448 | dp += 6; |
| 449 | */ |
Glenn Randers-Pehrson | 3097f61 | 2001-05-07 14:52:45 -0500 | [diff] [blame] | 450 | |
Glenn Randers-Pehrson | 896239b | 1998-04-21 15:03:57 -0500 | [diff] [blame] | 451 | sp+=2; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 452 | *dp++ = *sp++; |
| 453 | *dp++ = *sp++; |
| 454 | *dp++ = *sp++; |
| 455 | *dp++ = *sp++; |
| 456 | *dp++ = *sp++; |
| 457 | *dp++ = *sp++; |
| 458 | } |
| 459 | } |
| 460 | row_info->pixel_depth = 48; |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 461 | row_info->rowbytes = row_width * 6; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 462 | } |
| 463 | row_info->channels = 3; |
Glenn Randers-Pehrson | 896239b | 1998-04-21 15:03:57 -0500 | [diff] [blame] | 464 | row_info->color_type &= ~PNG_COLOR_MASK_ALPHA; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 465 | } |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 466 | /* |
| 467 | else if (row_info->color_type == PNG_COLOR_TYPE_GRAY || |
| 468 | row_info->color_type == PNG_COLOR_TYPE_GRAY_ALPHA) |
| 469 | */ |
| 470 | else if (row_info->channels == 2) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 471 | { |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 472 | if (row_info->bit_depth == 8) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 473 | { |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 474 | /* This converts from GX or GA to G */ |
| 475 | if (flags & PNG_FLAG_FILLER_AFTER) |
| 476 | { |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 477 | for (i = 0; i < row_width; i++) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 478 | { |
| 479 | *dp++ = *sp++; |
| 480 | sp++; |
| 481 | } |
| 482 | } |
| 483 | /* This converts from XG or AG to G */ |
| 484 | else |
| 485 | { |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 486 | for (i = 0; i < row_width; i++) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 487 | { |
| 488 | sp++; |
| 489 | *dp++ = *sp++; |
| 490 | } |
| 491 | } |
| 492 | row_info->pixel_depth = 8; |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 493 | row_info->rowbytes = row_width; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 494 | } |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 495 | else /* if (row_info->bit_depth == 16) */ |
| 496 | { |
| 497 | if (flags & PNG_FLAG_FILLER_AFTER) |
| 498 | { |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 499 | /* This converts from GGXX or GGAA to GG */ |
Glenn Randers-Pehrson | 896239b | 1998-04-21 15:03:57 -0500 | [diff] [blame] | 500 | sp += 4; dp += 2; |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 501 | for (i = 1; i < row_width; i++) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 502 | { |
| 503 | *dp++ = *sp++; |
| 504 | *dp++ = *sp++; |
| 505 | sp += 2; |
| 506 | } |
| 507 | } |
| 508 | else |
| 509 | { |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 510 | /* This converts from XXGG or AAGG to GG */ |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 511 | for (i = 0; i < row_width; i++) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 512 | { |
| 513 | sp += 2; |
| 514 | *dp++ = *sp++; |
| 515 | *dp++ = *sp++; |
| 516 | } |
| 517 | } |
| 518 | row_info->pixel_depth = 16; |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 519 | row_info->rowbytes = row_width * 2; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 520 | } |
| 521 | row_info->channels = 1; |
Glenn Randers-Pehrson | 896239b | 1998-04-21 15:03:57 -0500 | [diff] [blame] | 522 | row_info->color_type &= ~PNG_COLOR_MASK_ALPHA; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 523 | } |
| 524 | } |
| 525 | } |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 526 | #endif |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 527 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 528 | #if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED) |
| 529 | /* swaps red and blue bytes within a pixel */ |
Glenn Randers-Pehrson | 7529457 | 2000-05-06 14:09:57 -0500 | [diff] [blame] | 530 | void /* PRIVATE */ |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 531 | png_do_bgr(png_row_infop row_info, png_bytep row) |
| 532 | { |
| 533 | png_debug(1, "in png_do_bgr\n"); |
| 534 | if ( |
| 535 | #if defined(PNG_USELESS_TESTS_SUPPORTED) |
| 536 | row != NULL && row_info != NULL && |
| 537 | #endif |
| 538 | (row_info->color_type & PNG_COLOR_MASK_COLOR)) |
| 539 | { |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 540 | png_uint_32 row_width = row_info->width; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 541 | if (row_info->bit_depth == 8) |
| 542 | { |
| 543 | if (row_info->color_type == PNG_COLOR_TYPE_RGB) |
| 544 | { |
| 545 | png_bytep rp; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 546 | png_uint_32 i; |
| 547 | |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 548 | for (i = 0, rp = row; i < row_width; i++, rp += 3) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 549 | { |
Glenn Randers-Pehrson | 896239b | 1998-04-21 15:03:57 -0500 | [diff] [blame] | 550 | png_byte save = *rp; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 551 | *rp = *(rp + 2); |
| 552 | *(rp + 2) = save; |
| 553 | } |
| 554 | } |
| 555 | else if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA) |
| 556 | { |
| 557 | png_bytep rp; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 558 | png_uint_32 i; |
| 559 | |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 560 | for (i = 0, rp = row; i < row_width; i++, rp += 4) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 561 | { |
Glenn Randers-Pehrson | 896239b | 1998-04-21 15:03:57 -0500 | [diff] [blame] | 562 | png_byte save = *rp; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 563 | *rp = *(rp + 2); |
| 564 | *(rp + 2) = save; |
| 565 | } |
| 566 | } |
| 567 | } |
| 568 | else if (row_info->bit_depth == 16) |
| 569 | { |
| 570 | if (row_info->color_type == PNG_COLOR_TYPE_RGB) |
| 571 | { |
| 572 | png_bytep rp; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 573 | png_uint_32 i; |
| 574 | |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 575 | for (i = 0, rp = row; i < row_width; i++, rp += 6) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 576 | { |
Glenn Randers-Pehrson | 896239b | 1998-04-21 15:03:57 -0500 | [diff] [blame] | 577 | png_byte save = *rp; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 578 | *rp = *(rp + 4); |
Glenn Randers-Pehrson | 896239b | 1998-04-21 15:03:57 -0500 | [diff] [blame] | 579 | *(rp + 4) = save; |
| 580 | save = *(rp + 1); |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 581 | *(rp + 1) = *(rp + 5); |
Glenn Randers-Pehrson | 896239b | 1998-04-21 15:03:57 -0500 | [diff] [blame] | 582 | *(rp + 5) = save; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 583 | } |
| 584 | } |
| 585 | else if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA) |
| 586 | { |
| 587 | png_bytep rp; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 588 | png_uint_32 i; |
| 589 | |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 590 | for (i = 0, rp = row; i < row_width; i++, rp += 8) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 591 | { |
Glenn Randers-Pehrson | 896239b | 1998-04-21 15:03:57 -0500 | [diff] [blame] | 592 | png_byte save = *rp; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 593 | *rp = *(rp + 4); |
Glenn Randers-Pehrson | 896239b | 1998-04-21 15:03:57 -0500 | [diff] [blame] | 594 | *(rp + 4) = save; |
| 595 | save = *(rp + 1); |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 596 | *(rp + 1) = *(rp + 5); |
Glenn Randers-Pehrson | 896239b | 1998-04-21 15:03:57 -0500 | [diff] [blame] | 597 | *(rp + 5) = save; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 598 | } |
| 599 | } |
| 600 | } |
| 601 | } |
| 602 | } |
| 603 | #endif /* PNG_READ_BGR_SUPPORTED or PNG_WRITE_BGR_SUPPORTED */ |
| 604 | |
Glenn Randers-Pehrson | 4393a9a | 1999-09-17 12:27:26 -0500 | [diff] [blame] | 605 | #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \ |
Glenn Randers-Pehrson | 6942d53 | 2000-05-01 09:31:54 -0500 | [diff] [blame] | 606 | defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) || \ |
| 607 | defined(PNG_LEGACY_SUPPORTED) |
Glenn Randers-Pehrson | 7529457 | 2000-05-06 14:09:57 -0500 | [diff] [blame] | 608 | void PNGAPI |
Glenn Randers-Pehrson | 4393a9a | 1999-09-17 12:27:26 -0500 | [diff] [blame] | 609 | png_set_user_transform_info(png_structp png_ptr, png_voidp |
| 610 | user_transform_ptr, int user_transform_depth, int user_transform_channels) |
| 611 | { |
| 612 | png_debug(1, "in png_set_user_transform_info\n"); |
Glenn Randers-Pehrson | 6942d53 | 2000-05-01 09:31:54 -0500 | [diff] [blame] | 613 | #if defined(PNG_USER_TRANSFORM_PTR_SUPPORTED) |
Glenn Randers-Pehrson | 4393a9a | 1999-09-17 12:27:26 -0500 | [diff] [blame] | 614 | png_ptr->user_transform_ptr = user_transform_ptr; |
Glenn Randers-Pehrson | ab1e583 | 1999-10-06 04:57:42 -0500 | [diff] [blame] | 615 | png_ptr->user_transform_depth = (png_byte)user_transform_depth; |
| 616 | png_ptr->user_transform_channels = (png_byte)user_transform_channels; |
Glenn Randers-Pehrson | 6942d53 | 2000-05-01 09:31:54 -0500 | [diff] [blame] | 617 | #else |
| 618 | if(user_transform_ptr || user_transform_depth || user_transform_channels) |
| 619 | png_warning(png_ptr, |
| 620 | "This version of libpng does not support user transform info"); |
| 621 | #endif |
Glenn Randers-Pehrson | 4393a9a | 1999-09-17 12:27:26 -0500 | [diff] [blame] | 622 | } |
Glenn Randers-Pehrson | 6942d53 | 2000-05-01 09:31:54 -0500 | [diff] [blame] | 623 | #endif |
Glenn Randers-Pehrson | 4393a9a | 1999-09-17 12:27:26 -0500 | [diff] [blame] | 624 | |
| 625 | /* This function returns a pointer to the user_transform_ptr associated with |
| 626 | * the user transform functions. The application should free any memory |
| 627 | * associated with this pointer before png_write_destroy and png_read_destroy |
| 628 | * are called. |
| 629 | */ |
Glenn Randers-Pehrson | 7529457 | 2000-05-06 14:09:57 -0500 | [diff] [blame] | 630 | png_voidp PNGAPI |
Glenn Randers-Pehrson | 4393a9a | 1999-09-17 12:27:26 -0500 | [diff] [blame] | 631 | png_get_user_transform_ptr(png_structp png_ptr) |
| 632 | { |
Glenn Randers-Pehrson | 6942d53 | 2000-05-01 09:31:54 -0500 | [diff] [blame] | 633 | #if defined(PNG_USER_TRANSFORM_PTR_SUPPORTED) |
Glenn Randers-Pehrson | 4393a9a | 1999-09-17 12:27:26 -0500 | [diff] [blame] | 634 | return ((png_voidp)png_ptr->user_transform_ptr); |
Glenn Randers-Pehrson | 6942d53 | 2000-05-01 09:31:54 -0500 | [diff] [blame] | 635 | #else |
| 636 | if(png_ptr) |
| 637 | return (NULL); |
| 638 | return (NULL); |
Glenn Randers-Pehrson | 4393a9a | 1999-09-17 12:27:26 -0500 | [diff] [blame] | 639 | #endif |
Glenn Randers-Pehrson | 6942d53 | 2000-05-01 09:31:54 -0500 | [diff] [blame] | 640 | } |