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 | 8f8fb6a | 1998-03-09 23:02:06 -0600 | [diff] [blame^] | 4 | * libpng 1.0.0a |
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 |
| 6 | * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc. |
| 7 | * Copyright (c) 1996, 1997 Andreas Dilger |
Glenn Randers-Pehrson | 2687fcc | 1998-01-07 20:54:20 -0600 | [diff] [blame] | 8 | * Copyright (c) 1998, Glenn Randers-Pehrson |
Glenn Randers-Pehrson | 8f8fb6a | 1998-03-09 23:02:06 -0600 | [diff] [blame^] | 9 | * March 9, 1998 |
Glenn Randers-Pehrson | b6ce43d | 1998-01-01 07:13:13 -0600 | [diff] [blame] | 10 | */ |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 11 | |
| 12 | #define PNG_INTERNAL |
| 13 | #include "png.h" |
| 14 | |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 15 | #if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 16 | /* turn on bgr to rgb mapping */ |
| 17 | void |
Guy Schalnat | 6d76471 | 1995-12-19 03:22:19 -0600 | [diff] [blame] | 18 | png_set_bgr(png_structp png_ptr) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 19 | { |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 20 | png_debug(1, "in png_set_bgr\n"); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 21 | png_ptr->transformations |= PNG_BGR; |
| 22 | } |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 23 | #endif |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 24 | |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 25 | #if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 26 | /* turn on 16 bit byte swapping */ |
| 27 | void |
Guy Schalnat | 6d76471 | 1995-12-19 03:22:19 -0600 | [diff] [blame] | 28 | png_set_swap(png_structp png_ptr) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 29 | { |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 30 | png_debug(1, "in png_set_swap\n"); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 31 | if (png_ptr->bit_depth == 16) |
| 32 | png_ptr->transformations |= PNG_SWAP_BYTES; |
| 33 | } |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 34 | #endif |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 35 | |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 36 | #if defined(PNG_READ_PACK_SUPPORTED) || defined(PNG_WRITE_PACK_SUPPORTED) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 37 | /* turn on pixel packing */ |
| 38 | void |
Guy Schalnat | 6d76471 | 1995-12-19 03:22:19 -0600 | [diff] [blame] | 39 | png_set_packing(png_structp png_ptr) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 40 | { |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 41 | png_debug(1, "in png_set_packing\n"); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 42 | if (png_ptr->bit_depth < 8) |
| 43 | { |
| 44 | png_ptr->transformations |= PNG_PACK; |
| 45 | png_ptr->usr_bit_depth = 8; |
| 46 | } |
| 47 | } |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 48 | #endif |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 49 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 50 | #if defined(PNG_READ_PACKSWAP_SUPPORTED)||defined(PNG_WRITE_PACKSWAP_SUPPORTED) |
| 51 | /* turn on packed pixel swapping */ |
| 52 | void |
| 53 | png_set_packswap(png_structp png_ptr) |
| 54 | { |
| 55 | png_debug(1, "in png_set_packswap\n"); |
| 56 | if (png_ptr->bit_depth < 8) |
| 57 | png_ptr->transformations |= PNG_PACKSWAP; |
| 58 | } |
| 59 | #endif |
| 60 | |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 61 | #if defined(PNG_READ_SHIFT_SUPPORTED) || defined(PNG_WRITE_SHIFT_SUPPORTED) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 62 | void |
Guy Schalnat | 6d76471 | 1995-12-19 03:22:19 -0600 | [diff] [blame] | 63 | png_set_shift(png_structp png_ptr, png_color_8p true_bits) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 64 | { |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 65 | png_debug(1, "in png_set_shift\n"); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 66 | png_ptr->transformations |= PNG_SHIFT; |
| 67 | png_ptr->shift = *true_bits; |
| 68 | } |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 69 | #endif |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 70 | |
Glenn Randers-Pehrson | 46f61e2 | 1998-01-30 21:45:12 -0600 | [diff] [blame] | 71 | #if defined(PNG_READ_INTERLACING_SUPPORTED) || \ |
| 72 | defined(PNG_WRITE_INTERLACING_SUPPORTED) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 73 | int |
Guy Schalnat | 6d76471 | 1995-12-19 03:22:19 -0600 | [diff] [blame] | 74 | png_set_interlace_handling(png_structp png_ptr) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 75 | { |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 76 | png_debug(1, "in png_set_interlace handling\n"); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 77 | if (png_ptr->interlaced) |
| 78 | { |
| 79 | png_ptr->transformations |= PNG_INTERLACE; |
Glenn Randers-Pehrson | b212002 | 1998-01-31 20:07:59 -0600 | [diff] [blame] | 80 | return (7); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 81 | } |
| 82 | |
Glenn Randers-Pehrson | b212002 | 1998-01-31 20:07:59 -0600 | [diff] [blame] | 83 | return (1); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 84 | } |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 85 | #endif |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 86 | |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 87 | #if defined(PNG_READ_FILLER_SUPPORTED) || defined(PNG_WRITE_FILLER_SUPPORTED) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 88 | /* Add a filler byte on read, or remove a filler or alpha byte on write. |
| 89 | * The filler type has changed in v0.95 to allow future 2-byte fillers |
| 90 | * for 48-bit input data, as well as avoiding problems with some compilers |
| 91 | * which don't like bytes as parameters. |
| 92 | */ |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 93 | void |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 94 | 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] | 95 | { |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 96 | png_debug(1, "in png_set_filler\n"); |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 97 | png_ptr->transformations |= PNG_FILLER; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 98 | png_ptr->filler = (png_byte)filler; |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 99 | if (filler_loc == PNG_FILLER_AFTER) |
| 100 | png_ptr->flags |= PNG_FLAG_FILLER_AFTER; |
| 101 | else |
| 102 | png_ptr->flags &= ~PNG_FLAG_FILLER_AFTER; |
| 103 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 104 | /* This should probably go in the "do_filler" routine */ |
| 105 | if (png_ptr->color_type == PNG_COLOR_TYPE_RGB && png_ptr->bit_depth == 8) |
| 106 | { |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 107 | png_ptr->usr_channels = 4; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 108 | } |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 109 | } |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 110 | #endif |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 111 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 112 | #if defined(PNG_READ_SWAP_ALPHA_SUPPORTED) || \ |
| 113 | defined(PNG_WRITE_SWAP_ALPHA_SUPPORTED) |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 114 | void |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 115 | png_set_swap_alpha(png_structp png_ptr) |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 116 | { |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 117 | png_debug(1, "in png_set_swap_alpha\n"); |
| 118 | png_ptr->transformations |= PNG_SWAP_ALPHA; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 119 | } |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 120 | #endif |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 121 | |
Glenn Randers-Pehrson | c4a2ae6 | 1998-01-16 22:06:18 -0600 | [diff] [blame] | 122 | #if defined(PNG_READ_INVERT_ALPHA_SUPPORTED) || \ |
| 123 | defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED) |
| 124 | void |
| 125 | png_set_invert_alpha(png_structp png_ptr) |
| 126 | { |
| 127 | png_debug(1, "in png_set_invert_alpha\n"); |
| 128 | png_ptr->transformations |= PNG_INVERT_ALPHA; |
| 129 | } |
| 130 | #endif |
| 131 | |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 132 | #if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 133 | void |
Guy Schalnat | 6d76471 | 1995-12-19 03:22:19 -0600 | [diff] [blame] | 134 | png_set_invert_mono(png_structp png_ptr) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 135 | { |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 136 | png_debug(1, "in png_set_invert_mono\n"); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 137 | png_ptr->transformations |= PNG_INVERT_MONO; |
| 138 | } |
| 139 | |
| 140 | /* invert monocrome grayscale data */ |
| 141 | void |
Guy Schalnat | 6d76471 | 1995-12-19 03:22:19 -0600 | [diff] [blame] | 142 | png_do_invert(png_row_infop row_info, png_bytep row) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 143 | { |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 144 | png_debug(1, "in png_do_invert\n"); |
| 145 | if (row_info->bit_depth == 1 && |
| 146 | #if defined(PNG_USELESS_TESTS_SUPPORTED) |
| 147 | row != NULL && row_info != NULL && |
| 148 | #endif |
| 149 | row_info->color_type == PNG_COLOR_TYPE_GRAY) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 150 | { |
Guy Schalnat | 6d76471 | 1995-12-19 03:22:19 -0600 | [diff] [blame] | 151 | png_bytep rp; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 152 | png_uint_32 i; |
| 153 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 154 | for (i = 0, rp = row; i < row_info->rowbytes; i++, rp++) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 155 | { |
Guy Schalnat | 4ee97b0 | 1996-01-16 01:51:56 -0600 | [diff] [blame] | 156 | *rp = (png_byte)(~(*rp)); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 157 | } |
| 158 | } |
| 159 | } |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 160 | #endif |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 161 | |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 162 | #if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 163 | /* swaps byte order on 16 bit depth images */ |
| 164 | void |
Guy Schalnat | 6d76471 | 1995-12-19 03:22:19 -0600 | [diff] [blame] | 165 | png_do_swap(png_row_infop row_info, png_bytep row) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 166 | { |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 167 | png_debug(1, "in png_do_swap\n"); |
| 168 | if ( |
| 169 | #if defined(PNG_USELESS_TESTS_SUPPORTED) |
| 170 | row != NULL && row_info != NULL && |
| 171 | #endif |
| 172 | row_info->bit_depth == 16) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 173 | { |
Guy Schalnat | 6d76471 | 1995-12-19 03:22:19 -0600 | [diff] [blame] | 174 | png_bytep rp; |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 175 | png_byte t; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 176 | png_uint_32 i; |
| 177 | |
| 178 | for (i = 0, rp = row; |
| 179 | i < row_info->width * row_info->channels; |
| 180 | i++, rp += 2) |
| 181 | { |
| 182 | t = *rp; |
| 183 | *rp = *(rp + 1); |
| 184 | *(rp + 1) = t; |
| 185 | } |
| 186 | } |
| 187 | } |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 188 | #endif |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 189 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 190 | #if defined(PNG_READ_PACKSWAP_SUPPORTED)||defined(PNG_WRITE_PACKSWAP_SUPPORTED) |
| 191 | static png_byte onebppswaptable[256] = { |
| 192 | 0x00, 0x80, 0x40, 0xC0, 0x20, 0xA0, 0x60, 0xE0, |
| 193 | 0x10, 0x90, 0x50, 0xD0, 0x30, 0xB0, 0x70, 0xF0, |
| 194 | 0x08, 0x88, 0x48, 0xC8, 0x28, 0xA8, 0x68, 0xE8, |
| 195 | 0x18, 0x98, 0x58, 0xD8, 0x38, 0xB8, 0x78, 0xF8, |
| 196 | 0x04, 0x84, 0x44, 0xC4, 0x24, 0xA4, 0x64, 0xE4, |
| 197 | 0x14, 0x94, 0x54, 0xD4, 0x34, 0xB4, 0x74, 0xF4, |
| 198 | 0x0C, 0x8C, 0x4C, 0xCC, 0x2C, 0xAC, 0x6C, 0xEC, |
| 199 | 0x1C, 0x9C, 0x5C, 0xDC, 0x3C, 0xBC, 0x7C, 0xFC, |
| 200 | 0x02, 0x82, 0x42, 0xC2, 0x22, 0xA2, 0x62, 0xE2, |
| 201 | 0x12, 0x92, 0x52, 0xD2, 0x32, 0xB2, 0x72, 0xF2, |
| 202 | 0x0A, 0x8A, 0x4A, 0xCA, 0x2A, 0xAA, 0x6A, 0xEA, |
| 203 | 0x1A, 0x9A, 0x5A, 0xDA, 0x3A, 0xBA, 0x7A, 0xFA, |
| 204 | 0x06, 0x86, 0x46, 0xC6, 0x26, 0xA6, 0x66, 0xE6, |
| 205 | 0x16, 0x96, 0x56, 0xD6, 0x36, 0xB6, 0x76, 0xF6, |
| 206 | 0x0E, 0x8E, 0x4E, 0xCE, 0x2E, 0xAE, 0x6E, 0xEE, |
| 207 | 0x1E, 0x9E, 0x5E, 0xDE, 0x3E, 0xBE, 0x7E, 0xFE, |
| 208 | 0x01, 0x81, 0x41, 0xC1, 0x21, 0xA1, 0x61, 0xE1, |
| 209 | 0x11, 0x91, 0x51, 0xD1, 0x31, 0xB1, 0x71, 0xF1, |
| 210 | 0x09, 0x89, 0x49, 0xC9, 0x29, 0xA9, 0x69, 0xE9, |
| 211 | 0x19, 0x99, 0x59, 0xD9, 0x39, 0xB9, 0x79, 0xF9, |
| 212 | 0x05, 0x85, 0x45, 0xC5, 0x25, 0xA5, 0x65, 0xE5, |
| 213 | 0x15, 0x95, 0x55, 0xD5, 0x35, 0xB5, 0x75, 0xF5, |
| 214 | 0x0D, 0x8D, 0x4D, 0xCD, 0x2D, 0xAD, 0x6D, 0xED, |
| 215 | 0x1D, 0x9D, 0x5D, 0xDD, 0x3D, 0xBD, 0x7D, 0xFD, |
| 216 | 0x03, 0x83, 0x43, 0xC3, 0x23, 0xA3, 0x63, 0xE3, |
| 217 | 0x13, 0x93, 0x53, 0xD3, 0x33, 0xB3, 0x73, 0xF3, |
| 218 | 0x0B, 0x8B, 0x4B, 0xCB, 0x2B, 0xAB, 0x6B, 0xEB, |
| 219 | 0x1B, 0x9B, 0x5B, 0xDB, 0x3B, 0xBB, 0x7B, 0xFB, |
| 220 | 0x07, 0x87, 0x47, 0xC7, 0x27, 0xA7, 0x67, 0xE7, |
| 221 | 0x17, 0x97, 0x57, 0xD7, 0x37, 0xB7, 0x77, 0xF7, |
| 222 | 0x0F, 0x8F, 0x4F, 0xCF, 0x2F, 0xAF, 0x6F, 0xEF, |
| 223 | 0x1F, 0x9F, 0x5F, 0xDF, 0x3F, 0xBF, 0x7F, 0xFF |
| 224 | }; |
| 225 | |
| 226 | static png_byte twobppswaptable[256] = { |
| 227 | 0x00, 0x40, 0x80, 0xC0, 0x10, 0x50, 0x90, 0xD0, |
| 228 | 0x20, 0x60, 0xA0, 0xE0, 0x30, 0x70, 0xB0, 0xF0, |
| 229 | 0x04, 0x44, 0x84, 0xC4, 0x14, 0x54, 0x94, 0xD4, |
| 230 | 0x24, 0x64, 0xA4, 0xE4, 0x34, 0x74, 0xB4, 0xF4, |
| 231 | 0x08, 0x48, 0x88, 0xC8, 0x18, 0x58, 0x98, 0xD8, |
| 232 | 0x28, 0x68, 0xA8, 0xE8, 0x38, 0x78, 0xB8, 0xF8, |
| 233 | 0x0C, 0x4C, 0x8C, 0xCC, 0x1C, 0x5C, 0x9C, 0xDC, |
| 234 | 0x2C, 0x6C, 0xAC, 0xEC, 0x3C, 0x7C, 0xBC, 0xFC, |
| 235 | 0x01, 0x41, 0x81, 0xC1, 0x11, 0x51, 0x91, 0xD1, |
| 236 | 0x21, 0x61, 0xA1, 0xE1, 0x31, 0x71, 0xB1, 0xF1, |
| 237 | 0x05, 0x45, 0x85, 0xC5, 0x15, 0x55, 0x95, 0xD5, |
| 238 | 0x25, 0x65, 0xA5, 0xE5, 0x35, 0x75, 0xB5, 0xF5, |
| 239 | 0x09, 0x49, 0x89, 0xC9, 0x19, 0x59, 0x99, 0xD9, |
| 240 | 0x29, 0x69, 0xA9, 0xE9, 0x39, 0x79, 0xB9, 0xF9, |
| 241 | 0x0D, 0x4D, 0x8D, 0xCD, 0x1D, 0x5D, 0x9D, 0xDD, |
| 242 | 0x2D, 0x6D, 0xAD, 0xED, 0x3D, 0x7D, 0xBD, 0xFD, |
| 243 | 0x02, 0x42, 0x82, 0xC2, 0x12, 0x52, 0x92, 0xD2, |
| 244 | 0x22, 0x62, 0xA2, 0xE2, 0x32, 0x72, 0xB2, 0xF2, |
| 245 | 0x06, 0x46, 0x86, 0xC6, 0x16, 0x56, 0x96, 0xD6, |
| 246 | 0x26, 0x66, 0xA6, 0xE6, 0x36, 0x76, 0xB6, 0xF6, |
| 247 | 0x0A, 0x4A, 0x8A, 0xCA, 0x1A, 0x5A, 0x9A, 0xDA, |
| 248 | 0x2A, 0x6A, 0xAA, 0xEA, 0x3A, 0x7A, 0xBA, 0xFA, |
| 249 | 0x0E, 0x4E, 0x8E, 0xCE, 0x1E, 0x5E, 0x9E, 0xDE, |
| 250 | 0x2E, 0x6E, 0xAE, 0xEE, 0x3E, 0x7E, 0xBE, 0xFE, |
| 251 | 0x03, 0x43, 0x83, 0xC3, 0x13, 0x53, 0x93, 0xD3, |
| 252 | 0x23, 0x63, 0xA3, 0xE3, 0x33, 0x73, 0xB3, 0xF3, |
| 253 | 0x07, 0x47, 0x87, 0xC7, 0x17, 0x57, 0x97, 0xD7, |
| 254 | 0x27, 0x67, 0xA7, 0xE7, 0x37, 0x77, 0xB7, 0xF7, |
| 255 | 0x0B, 0x4B, 0x8B, 0xCB, 0x1B, 0x5B, 0x9B, 0xDB, |
| 256 | 0x2B, 0x6B, 0xAB, 0xEB, 0x3B, 0x7B, 0xBB, 0xFB, |
| 257 | 0x0F, 0x4F, 0x8F, 0xCF, 0x1F, 0x5F, 0x9F, 0xDF, |
| 258 | 0x2F, 0x6F, 0xAF, 0xEF, 0x3F, 0x7F, 0xBF, 0xFF |
| 259 | }; |
| 260 | |
| 261 | static png_byte fourbppswaptable[256] = { |
| 262 | 0x00, 0x10, 0x20, 0x30, 0x40, 0x50, 0x60, 0x70, |
| 263 | 0x80, 0x90, 0xA0, 0xB0, 0xC0, 0xD0, 0xE0, 0xF0, |
| 264 | 0x01, 0x11, 0x21, 0x31, 0x41, 0x51, 0x61, 0x71, |
| 265 | 0x81, 0x91, 0xA1, 0xB1, 0xC1, 0xD1, 0xE1, 0xF1, |
| 266 | 0x02, 0x12, 0x22, 0x32, 0x42, 0x52, 0x62, 0x72, |
| 267 | 0x82, 0x92, 0xA2, 0xB2, 0xC2, 0xD2, 0xE2, 0xF2, |
| 268 | 0x03, 0x13, 0x23, 0x33, 0x43, 0x53, 0x63, 0x73, |
| 269 | 0x83, 0x93, 0xA3, 0xB3, 0xC3, 0xD3, 0xE3, 0xF3, |
| 270 | 0x04, 0x14, 0x24, 0x34, 0x44, 0x54, 0x64, 0x74, |
| 271 | 0x84, 0x94, 0xA4, 0xB4, 0xC4, 0xD4, 0xE4, 0xF4, |
| 272 | 0x05, 0x15, 0x25, 0x35, 0x45, 0x55, 0x65, 0x75, |
| 273 | 0x85, 0x95, 0xA5, 0xB5, 0xC5, 0xD5, 0xE5, 0xF5, |
| 274 | 0x06, 0x16, 0x26, 0x36, 0x46, 0x56, 0x66, 0x76, |
| 275 | 0x86, 0x96, 0xA6, 0xB6, 0xC6, 0xD6, 0xE6, 0xF6, |
| 276 | 0x07, 0x17, 0x27, 0x37, 0x47, 0x57, 0x67, 0x77, |
| 277 | 0x87, 0x97, 0xA7, 0xB7, 0xC7, 0xD7, 0xE7, 0xF7, |
| 278 | 0x08, 0x18, 0x28, 0x38, 0x48, 0x58, 0x68, 0x78, |
| 279 | 0x88, 0x98, 0xA8, 0xB8, 0xC8, 0xD8, 0xE8, 0xF8, |
| 280 | 0x09, 0x19, 0x29, 0x39, 0x49, 0x59, 0x69, 0x79, |
| 281 | 0x89, 0x99, 0xA9, 0xB9, 0xC9, 0xD9, 0xE9, 0xF9, |
| 282 | 0x0A, 0x1A, 0x2A, 0x3A, 0x4A, 0x5A, 0x6A, 0x7A, |
| 283 | 0x8A, 0x9A, 0xAA, 0xBA, 0xCA, 0xDA, 0xEA, 0xFA, |
| 284 | 0x0B, 0x1B, 0x2B, 0x3B, 0x4B, 0x5B, 0x6B, 0x7B, |
| 285 | 0x8B, 0x9B, 0xAB, 0xBB, 0xCB, 0xDB, 0xEB, 0xFB, |
| 286 | 0x0C, 0x1C, 0x2C, 0x3C, 0x4C, 0x5C, 0x6C, 0x7C, |
| 287 | 0x8C, 0x9C, 0xAC, 0xBC, 0xCC, 0xDC, 0xEC, 0xFC, |
| 288 | 0x0D, 0x1D, 0x2D, 0x3D, 0x4D, 0x5D, 0x6D, 0x7D, |
| 289 | 0x8D, 0x9D, 0xAD, 0xBD, 0xCD, 0xDD, 0xED, 0xFD, |
| 290 | 0x0E, 0x1E, 0x2E, 0x3E, 0x4E, 0x5E, 0x6E, 0x7E, |
| 291 | 0x8E, 0x9E, 0xAE, 0xBE, 0xCE, 0xDE, 0xEE, 0xFE, |
| 292 | 0x0F, 0x1F, 0x2F, 0x3F, 0x4F, 0x5F, 0x6F, 0x7F, |
| 293 | 0x8F, 0x9F, 0xAF, 0xBF, 0xCF, 0xDF, 0xEF, 0xFF |
| 294 | }; |
| 295 | |
| 296 | /* swaps pixel packing order within bytes */ |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 297 | void |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 298 | png_do_packswap(png_row_infop row_info, png_bytep row) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 299 | { |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 300 | png_debug(1, "in png_do_packswap\n"); |
| 301 | if ( |
| 302 | #if defined(PNG_USELESS_TESTS_SUPPORTED) |
Glenn Randers-Pehrson | 46f61e2 | 1998-01-30 21:45:12 -0600 | [diff] [blame] | 303 | row != NULL && row_info != NULL && |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 304 | #endif |
| 305 | row_info->bit_depth < 8) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 306 | { |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 307 | png_bytep rp, end, table; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 308 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 309 | end = row + row_info->rowbytes; |
| 310 | |
| 311 | if (row_info->bit_depth == 1) |
| 312 | table = onebppswaptable; |
| 313 | else if (row_info->bit_depth == 2) |
| 314 | table = twobppswaptable; |
| 315 | else if (row_info->bit_depth == 4) |
| 316 | table = fourbppswaptable; |
| 317 | else |
| 318 | return; |
| 319 | |
| 320 | for (rp = row; rp < end; rp++) |
| 321 | *rp = table[*rp]; |
| 322 | } |
| 323 | } |
| 324 | #endif /* PNG_READ_PACKSWAP_SUPPORTED or PNG_WRITE_PACKSWAP_SUPPORTED */ |
| 325 | |
| 326 | #if defined(PNG_WRITE_FILLER_SUPPORTED) || \ |
| 327 | defined(PNG_READ_STRIP_ALPHA_SUPPORTED) |
| 328 | /* remove filler or alpha byte(s) */ |
| 329 | void |
| 330 | png_do_strip_filler(png_row_infop row_info, png_bytep row, png_uint_32 flags) |
| 331 | { |
| 332 | png_debug(1, "in png_do_strip_filler\n"); |
| 333 | #if defined(PNG_USELESS_TESTS_SUPPORTED) |
| 334 | if (row != NULL && row_info != NULL) |
| 335 | #endif |
| 336 | { |
| 337 | /* |
| 338 | if (row_info->color_type == PNG_COLOR_TYPE_RGB || |
| 339 | row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA) |
| 340 | */ |
| 341 | if (row_info->channels == 4) |
| 342 | { |
| 343 | if (row_info->bit_depth == 8) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 344 | { |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 345 | /* This converts from RGBX or RGBA to RGB */ |
| 346 | if (flags & PNG_FLAG_FILLER_AFTER) |
| 347 | { |
| 348 | png_bytep sp, dp; |
| 349 | png_uint_32 i; |
| 350 | |
| 351 | for (i = 1, sp = row + 4, dp = row + 3; i < row_info->width; i++) |
| 352 | { |
| 353 | *dp++ = *sp++; |
| 354 | *dp++ = *sp++; |
| 355 | *dp++ = *sp++; |
| 356 | sp++; |
| 357 | } |
| 358 | } |
| 359 | /* This converts from XRGB or ARGB to RGB */ |
| 360 | else |
| 361 | { |
| 362 | png_bytep sp, dp; |
| 363 | png_uint_32 i; |
| 364 | |
| 365 | for (i = 0, sp = row, dp = row; i < row_info->width; i++) |
| 366 | { |
| 367 | sp++; |
| 368 | *dp++ = *sp++; |
| 369 | *dp++ = *sp++; |
| 370 | *dp++ = *sp++; |
| 371 | } |
| 372 | } |
| 373 | row_info->pixel_depth = 24; |
| 374 | row_info->rowbytes = row_info->width * 3; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 375 | } |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 376 | else /* if (row_info->bit_depth == 16) */ |
| 377 | { |
| 378 | if (flags & PNG_FLAG_FILLER_AFTER) |
| 379 | { |
| 380 | png_bytep sp, dp; |
| 381 | png_uint_32 i; |
| 382 | |
| 383 | /* This converts from RRGGBBXX or RRGGBBAA to RRGGBB */ |
| 384 | for (i = 1, sp = row + 8, dp = row + 6; i < row_info->width; i++) |
| 385 | { |
| 386 | /* This could be (although memcpy is probably slower): |
| 387 | png_memcpy(dp, sp, 6); |
| 388 | sp += 8; |
| 389 | dp += 6; |
| 390 | */ |
| 391 | *dp++ = *sp++; |
| 392 | *dp++ = *sp++; |
| 393 | *dp++ = *sp++; |
| 394 | *dp++ = *sp++; |
| 395 | *dp++ = *sp++; |
| 396 | *dp++ = *sp++; |
| 397 | sp += 2; |
| 398 | } |
| 399 | } |
| 400 | else |
| 401 | { |
| 402 | png_bytep sp, dp; |
| 403 | png_uint_32 i; |
| 404 | |
| 405 | /* This converts from XXRRGGBB or AARRGGBB to RRGGBB */ |
| 406 | for (i = 0, sp = row + 2, dp = row; i < row_info->width; i++) |
| 407 | { |
| 408 | /* This could be (although memcpy is probably slower): |
| 409 | png_memcpy(dp, sp, 6); |
| 410 | sp += 8; |
| 411 | dp += 6; |
| 412 | */ |
| 413 | *dp++ = *sp++; |
| 414 | *dp++ = *sp++; |
| 415 | *dp++ = *sp++; |
| 416 | *dp++ = *sp++; |
| 417 | *dp++ = *sp++; |
| 418 | *dp++ = *sp++; |
| 419 | } |
| 420 | } |
| 421 | row_info->pixel_depth = 48; |
| 422 | row_info->rowbytes = row_info->width * 6; |
| 423 | } |
| 424 | row_info->channels = 3; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 425 | } |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 426 | /* |
| 427 | else if (row_info->color_type == PNG_COLOR_TYPE_GRAY || |
| 428 | row_info->color_type == PNG_COLOR_TYPE_GRAY_ALPHA) |
| 429 | */ |
| 430 | else if (row_info->channels == 2) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 431 | { |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 432 | if (row_info->bit_depth == 8) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 433 | { |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 434 | /* This converts from GX or GA to G */ |
| 435 | if (flags & PNG_FLAG_FILLER_AFTER) |
| 436 | { |
| 437 | png_bytep sp, dp; |
| 438 | png_uint_32 i; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 439 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 440 | for (i = 1, sp = row + 2, dp = row + 1; i < row_info->width; i++) |
| 441 | { |
| 442 | *dp++ = *sp++; |
| 443 | sp++; |
| 444 | } |
| 445 | } |
| 446 | /* This converts from XG or AG to G */ |
| 447 | else |
| 448 | { |
| 449 | png_bytep sp, dp; |
| 450 | png_uint_32 i; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 451 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 452 | for (i = 0, sp = row, dp = row; i < row_info->width; i++) |
| 453 | { |
| 454 | sp++; |
| 455 | *dp++ = *sp++; |
| 456 | } |
| 457 | } |
| 458 | row_info->pixel_depth = 8; |
| 459 | row_info->rowbytes = row_info->width; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 460 | } |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 461 | else /* if (row_info->bit_depth == 16) */ |
| 462 | { |
| 463 | if (flags & PNG_FLAG_FILLER_AFTER) |
| 464 | { |
| 465 | png_bytep sp, dp; |
| 466 | png_uint_32 i; |
| 467 | |
| 468 | /* This converts from GGXX or GGAA to GG */ |
| 469 | for (i = 1, sp = row + 4, dp = row + 2; i < row_info->width; i++) |
| 470 | { |
| 471 | *dp++ = *sp++; |
| 472 | *dp++ = *sp++; |
| 473 | sp += 2; |
| 474 | } |
| 475 | } |
| 476 | else |
| 477 | { |
| 478 | png_bytep sp, dp; |
| 479 | png_uint_32 i; |
| 480 | |
| 481 | /* This converts from XXGG or AAGG to GG */ |
| 482 | for (i = 0, sp = row, dp = row; i < row_info->width; i++) |
| 483 | { |
| 484 | sp += 2; |
| 485 | *dp++ = *sp++; |
| 486 | *dp++ = *sp++; |
| 487 | } |
| 488 | } |
| 489 | row_info->pixel_depth = 16; |
| 490 | row_info->rowbytes = row_info->width * 2; |
| 491 | } |
| 492 | row_info->channels = 1; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 493 | } |
| 494 | } |
| 495 | } |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 496 | #endif |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 497 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 498 | #if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED) |
| 499 | /* swaps red and blue bytes within a pixel */ |
| 500 | void |
| 501 | png_do_bgr(png_row_infop row_info, png_bytep row) |
| 502 | { |
| 503 | png_debug(1, "in png_do_bgr\n"); |
| 504 | if ( |
| 505 | #if defined(PNG_USELESS_TESTS_SUPPORTED) |
| 506 | row != NULL && row_info != NULL && |
| 507 | #endif |
| 508 | (row_info->color_type & PNG_COLOR_MASK_COLOR)) |
| 509 | { |
| 510 | if (row_info->bit_depth == 8) |
| 511 | { |
| 512 | if (row_info->color_type == PNG_COLOR_TYPE_RGB) |
| 513 | { |
| 514 | png_bytep rp; |
| 515 | png_byte save; |
| 516 | png_uint_32 i; |
| 517 | |
| 518 | for (i = 0, rp = row; i < row_info->width; i++, rp += 3) |
| 519 | { |
| 520 | save = *rp; |
| 521 | *rp = *(rp + 2); |
| 522 | *(rp + 2) = save; |
| 523 | } |
| 524 | } |
| 525 | else if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA) |
| 526 | { |
| 527 | png_bytep rp; |
| 528 | png_byte save; |
| 529 | png_uint_32 i; |
| 530 | |
| 531 | for (i = 0, rp = row; i < row_info->width; i++, rp += 4) |
| 532 | { |
| 533 | save = *rp; |
| 534 | *rp = *(rp + 2); |
| 535 | *(rp + 2) = save; |
| 536 | } |
| 537 | } |
| 538 | } |
| 539 | else if (row_info->bit_depth == 16) |
| 540 | { |
| 541 | if (row_info->color_type == PNG_COLOR_TYPE_RGB) |
| 542 | { |
| 543 | png_bytep rp; |
| 544 | png_byte save[2]; |
| 545 | png_uint_32 i; |
| 546 | |
| 547 | for (i = 0, rp = row; i < row_info->width; i++, rp += 6) |
| 548 | { |
| 549 | save[0] = *rp; |
| 550 | save[1] = *(rp + 1); |
| 551 | *rp = *(rp + 4); |
| 552 | *(rp + 1) = *(rp + 5); |
| 553 | *(rp + 4) = save[0]; |
| 554 | *(rp + 5) = save[1]; |
| 555 | } |
| 556 | } |
| 557 | else if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA) |
| 558 | { |
| 559 | png_bytep rp; |
| 560 | png_byte save[2]; |
| 561 | png_uint_32 i; |
| 562 | |
| 563 | for (i = 0, rp = row; i < row_info->width; i++, rp += 8) |
| 564 | { |
| 565 | save[0] = *rp; |
| 566 | save[1] = *(rp + 1); |
| 567 | *rp = *(rp + 4); |
| 568 | *(rp + 1) = *(rp + 5); |
| 569 | *(rp + 4) = save[0]; |
| 570 | *(rp + 5) = save[1]; |
| 571 | } |
| 572 | } |
| 573 | } |
| 574 | } |
| 575 | } |
| 576 | #endif /* PNG_READ_BGR_SUPPORTED or PNG_WRITE_BGR_SUPPORTED */ |
| 577 | |