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 | /* pngwtran.c - transforms the data in a row for PNG writers |
Glenn Randers-Pehrson | b6ce43d | 1998-01-01 07:13:13 -0600 | [diff] [blame] | 3 | * |
Glenn Randers-Pehrson | f0eda4e | 2010-10-15 15:01:57 -0500 | [diff] [blame] | 4 | * Last changed in libpng 1.5.0 [(PENDING RELEASE)] |
Glenn Randers-Pehrson | e69b55d | 2010-01-01 10:29:06 -0600 | [diff] [blame] | 5 | * Copyright (c) 1998-2010 Glenn Randers-Pehrson |
Glenn Randers-Pehrson | d436672 | 2000-06-04 14:29:29 -0500 | [diff] [blame] | 6 | * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger) |
| 7 | * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.) |
Glenn Randers-Pehrson | 3e61d79 | 2009-06-24 09:31:28 -0500 | [diff] [blame] | 8 | * |
Glenn Randers-Pehrson | bfbf865 | 2009-06-26 21:46:52 -0500 | [diff] [blame] | 9 | * This code is released under the libpng license. |
Glenn Randers-Pehrson | c332bbc | 2009-06-25 13:43:50 -0500 | [diff] [blame] | 10 | * For conditions of distribution and use, see the disclaimer |
Glenn Randers-Pehrson | 037023b | 2009-06-24 10:27:36 -0500 | [diff] [blame] | 11 | * and license in png.h |
Glenn Randers-Pehrson | b6ce43d | 1998-01-01 07:13:13 -0600 | [diff] [blame] | 12 | */ |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 13 | |
Glenn Randers-Pehrson | beb572e | 2006-08-19 13:59:24 -0500 | [diff] [blame] | 14 | #include "pngpriv.h" |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 15 | |
Glenn Randers-Pehrson | c3cd22b | 2010-03-08 21:10:25 -0600 | [diff] [blame] | 16 | #ifdef PNG_WRITE_SUPPORTED |
| 17 | |
Glenn Randers-Pehrson | 345bc27 | 1998-06-14 14:43:31 -0500 | [diff] [blame] | 18 | /* Transform the data according to the user's wishes. The order of |
Glenn Randers-Pehrson | b6ce43d | 1998-01-01 07:13:13 -0600 | [diff] [blame] | 19 | * transformations is significant. |
| 20 | */ |
Glenn Randers-Pehrson | 7529457 | 2000-05-06 14:09:57 -0500 | [diff] [blame] | 21 | void /* PRIVATE */ |
Guy Schalnat | 6d76471 | 1995-12-19 03:22:19 -0600 | [diff] [blame] | 22 | png_do_write_transformations(png_structp png_ptr) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 23 | { |
Glenn Randers-Pehrson | 51650b8 | 2008-08-05 07:44:42 -0500 | [diff] [blame] | 24 | png_debug(1, "in png_do_write_transformations"); |
Glenn Randers-Pehrson | 08a3343 | 1998-03-07 06:06:55 -0600 | [diff] [blame] | 25 | |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 26 | if (png_ptr == NULL) |
| 27 | return; |
| 28 | |
Glenn Randers-Pehrson | e26c095 | 2009-09-23 11:22:08 -0500 | [diff] [blame] | 29 | #ifdef PNG_WRITE_USER_TRANSFORM_SUPPORTED |
Glenn Randers-Pehrson | 08a3343 | 1998-03-07 06:06:55 -0600 | [diff] [blame] | 30 | if (png_ptr->transformations & PNG_USER_TRANSFORM) |
Glenn Randers-Pehrson | 145f5c8 | 2008-07-10 09:13:13 -0500 | [diff] [blame] | 31 | if (png_ptr->write_user_transform_fn != NULL) |
Glenn Randers-Pehrson | ccadcae | 2010-10-23 17:29:13 -0500 | [diff] [blame^] | 32 | (*(png_ptr->write_user_transform_fn)) /* User write transform |
Glenn Randers-Pehrson | e3f3c4e | 2010-02-07 18:08:50 -0600 | [diff] [blame] | 33 | function */ |
Glenn Randers-Pehrson | ccadcae | 2010-10-23 17:29:13 -0500 | [diff] [blame^] | 34 | (png_ptr, /* png_ptr */ |
| 35 | &(png_ptr->row_info), /* row_info: */ |
| 36 | /* png_uint_32 width; width of row */ |
| 37 | /* png_size_t rowbytes; number of bytes in row */ |
| 38 | /* png_byte color_type; color type of pixels */ |
| 39 | /* png_byte bit_depth; bit depth of samples */ |
| 40 | /* png_byte channels; number of channels (1-4) */ |
| 41 | /* png_byte pixel_depth; bits per pixel (depth*channels) */ |
| 42 | png_ptr->row_buf + 1); /* start of pixel data for row */ |
Glenn Randers-Pehrson | 08a3343 | 1998-03-07 06:06:55 -0600 | [diff] [blame] | 43 | #endif |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 44 | |
Glenn Randers-Pehrson | e26c095 | 2009-09-23 11:22:08 -0500 | [diff] [blame] | 45 | #ifdef PNG_WRITE_FILLER_SUPPORTED |
Glenn Randers-Pehrson | 73b029f | 2004-11-26 17:28:09 -0600 | [diff] [blame] | 46 | if (png_ptr->transformations & PNG_FILLER) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 47 | png_do_strip_filler(&(png_ptr->row_info), png_ptr->row_buf + 1, |
Glenn Randers-Pehrson | 45624d6 | 2010-03-03 11:40:43 -0600 | [diff] [blame] | 48 | png_ptr->flags); |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 49 | #endif |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 50 | |
Glenn Randers-Pehrson | e26c095 | 2009-09-23 11:22:08 -0500 | [diff] [blame] | 51 | #ifdef PNG_WRITE_PACKSWAP_SUPPORTED |
Glenn Randers-Pehrson | 46f61e2 | 1998-01-30 21:45:12 -0600 | [diff] [blame] | 52 | if (png_ptr->transformations & PNG_PACKSWAP) |
| 53 | png_do_packswap(&(png_ptr->row_info), png_ptr->row_buf + 1); |
| 54 | #endif |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 55 | |
Glenn Randers-Pehrson | e26c095 | 2009-09-23 11:22:08 -0500 | [diff] [blame] | 56 | #ifdef PNG_WRITE_PACK_SUPPORTED |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 57 | if (png_ptr->transformations & PNG_PACK) |
| 58 | png_do_pack(&(png_ptr->row_info), png_ptr->row_buf + 1, |
Glenn Randers-Pehrson | 45624d6 | 2010-03-03 11:40:43 -0600 | [diff] [blame] | 59 | (png_uint_32)png_ptr->bit_depth); |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 60 | #endif |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 61 | |
Glenn Randers-Pehrson | e26c095 | 2009-09-23 11:22:08 -0500 | [diff] [blame] | 62 | #ifdef PNG_WRITE_SWAP_SUPPORTED |
Glenn Randers-Pehrson | 5c6aeb2 | 1998-12-29 11:47:59 -0600 | [diff] [blame] | 63 | if (png_ptr->transformations & PNG_SWAP_BYTES) |
| 64 | png_do_swap(&(png_ptr->row_info), png_ptr->row_buf + 1); |
| 65 | #endif |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 66 | |
Glenn Randers-Pehrson | e26c095 | 2009-09-23 11:22:08 -0500 | [diff] [blame] | 67 | #ifdef PNG_WRITE_SHIFT_SUPPORTED |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 68 | if (png_ptr->transformations & PNG_SHIFT) |
| 69 | png_do_shift(&(png_ptr->row_info), png_ptr->row_buf + 1, |
Glenn Randers-Pehrson | 45624d6 | 2010-03-03 11:40:43 -0600 | [diff] [blame] | 70 | &(png_ptr->shift)); |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 71 | #endif |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 72 | |
Glenn Randers-Pehrson | e26c095 | 2009-09-23 11:22:08 -0500 | [diff] [blame] | 73 | #ifdef PNG_WRITE_SWAP_ALPHA_SUPPORTED |
Glenn Randers-Pehrson | cbe52d8 | 1998-02-28 07:00:24 -0600 | [diff] [blame] | 74 | if (png_ptr->transformations & PNG_SWAP_ALPHA) |
| 75 | png_do_write_swap_alpha(&(png_ptr->row_info), png_ptr->row_buf + 1); |
| 76 | #endif |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 77 | |
Glenn Randers-Pehrson | e26c095 | 2009-09-23 11:22:08 -0500 | [diff] [blame] | 78 | #ifdef PNG_WRITE_INVERT_ALPHA_SUPPORTED |
Glenn Randers-Pehrson | 9c3ab68 | 2006-02-20 22:09:05 -0600 | [diff] [blame] | 79 | if (png_ptr->transformations & PNG_INVERT_ALPHA) |
| 80 | png_do_write_invert_alpha(&(png_ptr->row_info), png_ptr->row_buf + 1); |
| 81 | #endif |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 82 | |
Glenn Randers-Pehrson | e26c095 | 2009-09-23 11:22:08 -0500 | [diff] [blame] | 83 | #ifdef PNG_WRITE_BGR_SUPPORTED |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 84 | if (png_ptr->transformations & PNG_BGR) |
| 85 | png_do_bgr(&(png_ptr->row_info), png_ptr->row_buf + 1); |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 86 | #endif |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 87 | |
Glenn Randers-Pehrson | e26c095 | 2009-09-23 11:22:08 -0500 | [diff] [blame] | 88 | #ifdef PNG_WRITE_INVERT_SUPPORTED |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 89 | if (png_ptr->transformations & PNG_INVERT_MONO) |
| 90 | png_do_invert(&(png_ptr->row_info), png_ptr->row_buf + 1); |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 91 | #endif |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 92 | } |
| 93 | |
Glenn Randers-Pehrson | e26c095 | 2009-09-23 11:22:08 -0500 | [diff] [blame] | 94 | #ifdef PNG_WRITE_PACK_SUPPORTED |
Glenn Randers-Pehrson | b6ce43d | 1998-01-01 07:13:13 -0600 | [diff] [blame] | 95 | /* Pack pixels into bytes. Pass the true bit depth in bit_depth. The |
| 96 | * row_info bit depth should be 8 (one pixel per byte). The channels |
| 97 | * should be 1 (this only happens on grayscale and paletted images). |
| 98 | */ |
Glenn Randers-Pehrson | 7529457 | 2000-05-06 14:09:57 -0500 | [diff] [blame] | 99 | void /* PRIVATE */ |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 100 | png_do_pack(png_row_infop row_info, png_bytep row, png_uint_32 bit_depth) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 101 | { |
Glenn Randers-Pehrson | 51650b8 | 2008-08-05 07:44:42 -0500 | [diff] [blame] | 102 | png_debug(1, "in png_do_pack"); |
Glenn Randers-Pehrson | da00980 | 2009-08-15 13:25:47 -0500 | [diff] [blame] | 103 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 104 | if (row_info->bit_depth == 8 && |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 105 | row_info->channels == 1) |
| 106 | { |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 107 | switch ((int)bit_depth) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 108 | { |
| 109 | case 1: |
| 110 | { |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 111 | png_bytep sp, dp; |
| 112 | int mask, v; |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 113 | png_uint_32 i; |
| 114 | png_uint_32 row_width = row_info->width; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 115 | |
| 116 | sp = row; |
| 117 | dp = row; |
| 118 | mask = 0x80; |
| 119 | v = 0; |
Glenn Randers-Pehrson | 5c6aeb2 | 1998-12-29 11:47:59 -0600 | [diff] [blame] | 120 | |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 121 | for (i = 0; i < row_width; i++) |
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 (*sp != 0) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 124 | v |= mask; |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 125 | |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 126 | sp++; |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 127 | |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 128 | if (mask > 1) |
| 129 | mask >>= 1; |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 130 | |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 131 | else |
| 132 | { |
| 133 | mask = 0x80; |
Guy Schalnat | b2e01bd | 1996-01-26 01:38:47 -0600 | [diff] [blame] | 134 | *dp = (png_byte)v; |
| 135 | dp++; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 136 | v = 0; |
| 137 | } |
| 138 | } |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 139 | |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 140 | if (mask != 0x80) |
Guy Schalnat | b2e01bd | 1996-01-26 01:38:47 -0600 | [diff] [blame] | 141 | *dp = (png_byte)v; |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 142 | |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 143 | break; |
| 144 | } |
Glenn Randers-Pehrson | ccadcae | 2010-10-23 17:29:13 -0500 | [diff] [blame^] | 145 | |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 146 | case 2: |
| 147 | { |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 148 | png_bytep sp, dp; |
| 149 | int shift, v; |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 150 | png_uint_32 i; |
| 151 | png_uint_32 row_width = row_info->width; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 152 | |
| 153 | sp = row; |
| 154 | dp = row; |
| 155 | shift = 6; |
| 156 | v = 0; |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 157 | |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 158 | for (i = 0; i < row_width; i++) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 159 | { |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 160 | png_byte value; |
| 161 | |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 162 | value = (png_byte)(*sp & 0x03); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 163 | v |= (value << shift); |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 164 | |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 165 | if (shift == 0) |
| 166 | { |
| 167 | shift = 6; |
Guy Schalnat | b2e01bd | 1996-01-26 01:38:47 -0600 | [diff] [blame] | 168 | *dp = (png_byte)v; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 169 | dp++; |
| 170 | v = 0; |
| 171 | } |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 172 | |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 173 | else |
| 174 | shift -= 2; |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 175 | |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 176 | sp++; |
| 177 | } |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 178 | |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 179 | if (shift != 6) |
Guy Schalnat | b2e01bd | 1996-01-26 01:38:47 -0600 | [diff] [blame] | 180 | *dp = (png_byte)v; |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 181 | |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 182 | break; |
| 183 | } |
Glenn Randers-Pehrson | ccadcae | 2010-10-23 17:29:13 -0500 | [diff] [blame^] | 184 | |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 185 | case 4: |
| 186 | { |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 187 | png_bytep sp, dp; |
| 188 | int shift, v; |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 189 | png_uint_32 i; |
| 190 | png_uint_32 row_width = row_info->width; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 191 | |
| 192 | sp = row; |
| 193 | dp = row; |
| 194 | shift = 4; |
| 195 | v = 0; |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 196 | |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 197 | for (i = 0; i < row_width; i++) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 198 | { |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 199 | png_byte value; |
| 200 | |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 201 | value = (png_byte)(*sp & 0x0f); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 202 | v |= (value << shift); |
| 203 | |
| 204 | if (shift == 0) |
| 205 | { |
| 206 | shift = 4; |
Guy Schalnat | b2e01bd | 1996-01-26 01:38:47 -0600 | [diff] [blame] | 207 | *dp = (png_byte)v; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 208 | dp++; |
| 209 | v = 0; |
| 210 | } |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 211 | |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 212 | else |
| 213 | shift -= 4; |
| 214 | |
| 215 | sp++; |
| 216 | } |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 217 | |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 218 | if (shift != 4) |
Guy Schalnat | b2e01bd | 1996-01-26 01:38:47 -0600 | [diff] [blame] | 219 | *dp = (png_byte)v; |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 220 | |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 221 | break; |
| 222 | } |
| 223 | } |
Glenn Randers-Pehrson | ccadcae | 2010-10-23 17:29:13 -0500 | [diff] [blame^] | 224 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 225 | row_info->bit_depth = (png_byte)bit_depth; |
| 226 | row_info->pixel_depth = (png_byte)(bit_depth * row_info->channels); |
Glenn Randers-Pehrson | 272489d | 2004-08-04 06:34:52 -0500 | [diff] [blame] | 227 | row_info->rowbytes = PNG_ROWBYTES(row_info->pixel_depth, |
Glenn Randers-Pehrson | 45624d6 | 2010-03-03 11:40:43 -0600 | [diff] [blame] | 228 | row_info->width); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 229 | } |
| 230 | } |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 231 | #endif |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 232 | |
Glenn Randers-Pehrson | e26c095 | 2009-09-23 11:22:08 -0500 | [diff] [blame] | 233 | #ifdef PNG_WRITE_SHIFT_SUPPORTED |
Glenn Randers-Pehrson | b6ce43d | 1998-01-01 07:13:13 -0600 | [diff] [blame] | 234 | /* Shift pixel values to take advantage of whole range. Pass the |
| 235 | * true number of bits in bit_depth. The row should be packed |
| 236 | * according to row_info->bit_depth. Thus, if you had a row of |
| 237 | * bit depth 4, but the pixels only had values from 0 to 7, you |
| 238 | * would pass 3 as bit_depth, and this routine would translate the |
| 239 | * data to 0 to 15. |
| 240 | */ |
Glenn Randers-Pehrson | 7529457 | 2000-05-06 14:09:57 -0500 | [diff] [blame] | 241 | void /* PRIVATE */ |
Glenn Randers-Pehrson | e600c51 | 2010-08-18 07:25:46 -0500 | [diff] [blame] | 242 | png_do_shift(png_row_infop row_info, png_bytep row, |
| 243 | png_const_color_8p bit_depth) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 244 | { |
Glenn Randers-Pehrson | 51650b8 | 2008-08-05 07:44:42 -0500 | [diff] [blame] | 245 | png_debug(1, "in png_do_shift"); |
Glenn Randers-Pehrson | da00980 | 2009-08-15 13:25:47 -0500 | [diff] [blame] | 246 | |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 247 | if (row_info->color_type != PNG_COLOR_TYPE_PALETTE) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 248 | { |
| 249 | int shift_start[4], shift_dec[4]; |
Glenn Randers-Pehrson | d0dce40 | 1998-05-09 10:02:29 -0500 | [diff] [blame] | 250 | int channels = 0; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 251 | |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 252 | if (row_info->color_type & PNG_COLOR_MASK_COLOR) |
| 253 | { |
| 254 | shift_start[channels] = row_info->bit_depth - bit_depth->red; |
| 255 | shift_dec[channels] = bit_depth->red; |
| 256 | channels++; |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 257 | |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 258 | shift_start[channels] = row_info->bit_depth - bit_depth->green; |
| 259 | shift_dec[channels] = bit_depth->green; |
| 260 | channels++; |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 261 | |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 262 | shift_start[channels] = row_info->bit_depth - bit_depth->blue; |
| 263 | shift_dec[channels] = bit_depth->blue; |
| 264 | channels++; |
| 265 | } |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 266 | |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 267 | else |
| 268 | { |
| 269 | shift_start[channels] = row_info->bit_depth - bit_depth->gray; |
| 270 | shift_dec[channels] = bit_depth->gray; |
| 271 | channels++; |
| 272 | } |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 273 | |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 274 | if (row_info->color_type & PNG_COLOR_MASK_ALPHA) |
| 275 | { |
| 276 | shift_start[channels] = row_info->bit_depth - bit_depth->alpha; |
| 277 | shift_dec[channels] = bit_depth->alpha; |
| 278 | channels++; |
| 279 | } |
| 280 | |
Glenn Randers-Pehrson | 4bb4d01 | 2009-05-20 12:45:29 -0500 | [diff] [blame] | 281 | /* With low row depths, could only be grayscale, so one channel */ |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 282 | if (row_info->bit_depth < 8) |
| 283 | { |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 284 | png_bytep bp = row; |
Glenn Randers-Pehrson | bcb3aac | 2010-09-10 22:05:27 -0500 | [diff] [blame] | 285 | png_size_t i; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 286 | png_byte mask; |
Glenn Randers-Pehrson | bcb3aac | 2010-09-10 22:05:27 -0500 | [diff] [blame] | 287 | png_size_t row_bytes = row_info->rowbytes; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 288 | |
| 289 | if (bit_depth->gray == 1 && row_info->bit_depth == 2) |
| 290 | mask = 0x55; |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 291 | |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 292 | else if (row_info->bit_depth == 4 && bit_depth->gray == 3) |
| 293 | mask = 0x11; |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 294 | |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 295 | else |
| 296 | mask = 0xff; |
| 297 | |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 298 | for (i = 0; i < row_bytes; i++, bp++) |
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_uint_16 v; |
| 301 | int j; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 302 | |
| 303 | v = *bp; |
| 304 | *bp = 0; |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 305 | |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 306 | for (j = shift_start[0]; j > -shift_dec[0]; j -= shift_dec[0]) |
| 307 | { |
| 308 | if (j > 0) |
| 309 | *bp |= (png_byte)((v << j) & 0xff); |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 310 | |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 311 | else |
| 312 | *bp |= (png_byte)((v >> (-j)) & mask); |
| 313 | } |
| 314 | } |
| 315 | } |
Glenn Randers-Pehrson | ccadcae | 2010-10-23 17:29:13 -0500 | [diff] [blame^] | 316 | |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 317 | else if (row_info->bit_depth == 8) |
| 318 | { |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 319 | png_bytep bp = row; |
| 320 | png_uint_32 i; |
Glenn Randers-Pehrson | d0dce40 | 1998-05-09 10:02:29 -0500 | [diff] [blame] | 321 | png_uint_32 istop = channels * row_info->width; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 322 | |
Glenn Randers-Pehrson | d0dce40 | 1998-05-09 10:02:29 -0500 | [diff] [blame] | 323 | for (i = 0; i < istop; i++, bp++) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 324 | { |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 325 | |
Glenn Randers-Pehrson | d0dce40 | 1998-05-09 10:02:29 -0500 | [diff] [blame] | 326 | png_uint_16 v; |
| 327 | int j; |
| 328 | int c = (int)(i%channels); |
| 329 | |
| 330 | v = *bp; |
| 331 | *bp = 0; |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 332 | |
Glenn Randers-Pehrson | d0dce40 | 1998-05-09 10:02:29 -0500 | [diff] [blame] | 333 | for (j = shift_start[c]; j > -shift_dec[c]; j -= shift_dec[c]) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 334 | { |
Glenn Randers-Pehrson | d0dce40 | 1998-05-09 10:02:29 -0500 | [diff] [blame] | 335 | if (j > 0) |
| 336 | *bp |= (png_byte)((v << j) & 0xff); |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 337 | |
Glenn Randers-Pehrson | d0dce40 | 1998-05-09 10:02:29 -0500 | [diff] [blame] | 338 | else |
| 339 | *bp |= (png_byte)((v >> (-j)) & 0xff); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 340 | } |
| 341 | } |
| 342 | } |
Glenn Randers-Pehrson | ccadcae | 2010-10-23 17:29:13 -0500 | [diff] [blame^] | 343 | |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 344 | else |
| 345 | { |
Guy Schalnat | 6d76471 | 1995-12-19 03:22:19 -0600 | [diff] [blame] | 346 | png_bytep bp; |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 347 | png_uint_32 i; |
Glenn Randers-Pehrson | d0dce40 | 1998-05-09 10:02:29 -0500 | [diff] [blame] | 348 | png_uint_32 istop = channels * row_info->width; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 349 | |
Glenn Randers-Pehrson | d0dce40 | 1998-05-09 10:02:29 -0500 | [diff] [blame] | 350 | for (bp = row, i = 0; i < istop; i++) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 351 | { |
Glenn Randers-Pehrson | d0dce40 | 1998-05-09 10:02:29 -0500 | [diff] [blame] | 352 | int c = (int)(i%channels); |
| 353 | png_uint_16 value, v; |
| 354 | int j; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 355 | |
Glenn Randers-Pehrson | 860ab2b | 1999-10-14 07:43:10 -0500 | [diff] [blame] | 356 | v = (png_uint_16)(((png_uint_16)(*bp) << 8) + *(bp + 1)); |
Glenn Randers-Pehrson | d0dce40 | 1998-05-09 10:02:29 -0500 | [diff] [blame] | 357 | value = 0; |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 358 | |
Glenn Randers-Pehrson | d0dce40 | 1998-05-09 10:02:29 -0500 | [diff] [blame] | 359 | for (j = shift_start[c]; j > -shift_dec[c]; j -= shift_dec[c]) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 360 | { |
Glenn Randers-Pehrson | d0dce40 | 1998-05-09 10:02:29 -0500 | [diff] [blame] | 361 | if (j > 0) |
| 362 | value |= (png_uint_16)((v << j) & (png_uint_16)0xffff); |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 363 | |
Glenn Randers-Pehrson | d0dce40 | 1998-05-09 10:02:29 -0500 | [diff] [blame] | 364 | else |
| 365 | value |= (png_uint_16)((v >> (-j)) & (png_uint_16)0xffff); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 366 | } |
Glenn Randers-Pehrson | d0dce40 | 1998-05-09 10:02:29 -0500 | [diff] [blame] | 367 | *bp++ = (png_byte)(value >> 8); |
| 368 | *bp++ = (png_byte)(value & 0xff); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 369 | } |
| 370 | } |
| 371 | } |
| 372 | } |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 373 | #endif |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 374 | |
Glenn Randers-Pehrson | e26c095 | 2009-09-23 11:22:08 -0500 | [diff] [blame] | 375 | #ifdef PNG_WRITE_SWAP_ALPHA_SUPPORTED |
Glenn Randers-Pehrson | 7529457 | 2000-05-06 14:09:57 -0500 | [diff] [blame] | 376 | void /* PRIVATE */ |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 377 | png_do_write_swap_alpha(png_row_infop row_info, png_bytep row) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 378 | { |
Glenn Randers-Pehrson | 51650b8 | 2008-08-05 07:44:42 -0500 | [diff] [blame] | 379 | png_debug(1, "in png_do_write_swap_alpha"); |
Glenn Randers-Pehrson | da00980 | 2009-08-15 13:25:47 -0500 | [diff] [blame] | 380 | |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 381 | { |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 382 | if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 383 | { |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 384 | if (row_info->bit_depth == 8) |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 385 | { |
Glenn Randers-Pehrson | 45624d6 | 2010-03-03 11:40:43 -0600 | [diff] [blame] | 386 | /* This converts from ARGB to RGBA */ |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 387 | png_bytep sp, dp; |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 388 | png_uint_32 i; |
| 389 | png_uint_32 row_width = row_info->width; |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 390 | |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 391 | for (i = 0, sp = dp = row; i < row_width; i++) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 392 | { |
Glenn Randers-Pehrson | 896239b | 1998-04-21 15:03:57 -0500 | [diff] [blame] | 393 | png_byte save = *(sp++); |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 394 | *(dp++) = *(sp++); |
| 395 | *(dp++) = *(sp++); |
| 396 | *(dp++) = *(sp++); |
| 397 | *(dp++) = save; |
| 398 | } |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 399 | } |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 400 | |
Glenn Randers-Pehrson | 7d3e673 | 2010-08-26 17:14:07 -0500 | [diff] [blame] | 401 | #ifdef PNG_WRITE_16BIT_SUPPORTED |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 402 | else |
| 403 | { |
Glenn Randers-Pehrson | 45624d6 | 2010-03-03 11:40:43 -0600 | [diff] [blame] | 404 | /* This converts from AARRGGBB to RRGGBBAA */ |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 405 | png_bytep sp, dp; |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 406 | png_uint_32 i; |
| 407 | png_uint_32 row_width = row_info->width; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 408 | |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 409 | for (i = 0, sp = dp = row; i < row_width; i++) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 410 | { |
Glenn Randers-Pehrson | 896239b | 1998-04-21 15:03:57 -0500 | [diff] [blame] | 411 | png_byte save[2]; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 412 | save[0] = *(sp++); |
| 413 | save[1] = *(sp++); |
| 414 | *(dp++) = *(sp++); |
| 415 | *(dp++) = *(sp++); |
| 416 | *(dp++) = *(sp++); |
| 417 | *(dp++) = *(sp++); |
| 418 | *(dp++) = *(sp++); |
| 419 | *(dp++) = *(sp++); |
| 420 | *(dp++) = save[0]; |
| 421 | *(dp++) = save[1]; |
| 422 | } |
| 423 | } |
Glenn Randers-Pehrson | 7d3e673 | 2010-08-26 17:14:07 -0500 | [diff] [blame] | 424 | #endif /* PNG_WRITE_16BIT_SUPPORTED */ |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 425 | } |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 426 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 427 | else if (row_info->color_type == PNG_COLOR_TYPE_GRAY_ALPHA) |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 428 | { |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 429 | if (row_info->bit_depth == 8) |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 430 | { |
Glenn Randers-Pehrson | 45624d6 | 2010-03-03 11:40:43 -0600 | [diff] [blame] | 431 | /* This converts from AG to GA */ |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 432 | png_bytep sp, dp; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 433 | png_uint_32 i; |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 434 | png_uint_32 row_width = row_info->width; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 435 | |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 436 | for (i = 0, sp = dp = row; i < row_width; i++) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 437 | { |
Glenn Randers-Pehrson | 896239b | 1998-04-21 15:03:57 -0500 | [diff] [blame] | 438 | png_byte save = *(sp++); |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 439 | *(dp++) = *(sp++); |
| 440 | *(dp++) = save; |
| 441 | } |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 442 | } |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 443 | |
Glenn Randers-Pehrson | 7d3e673 | 2010-08-26 17:14:07 -0500 | [diff] [blame] | 444 | #ifdef PNG_WRITE_16BIT_SUPPORTED |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 445 | else |
| 446 | { |
Glenn Randers-Pehrson | 45624d6 | 2010-03-03 11:40:43 -0600 | [diff] [blame] | 447 | /* This converts from AAGG to GGAA */ |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 448 | png_bytep sp, dp; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 449 | png_uint_32 i; |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 450 | png_uint_32 row_width = row_info->width; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 451 | |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 452 | for (i = 0, sp = dp = row; i < row_width; i++) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 453 | { |
Glenn Randers-Pehrson | 896239b | 1998-04-21 15:03:57 -0500 | [diff] [blame] | 454 | png_byte save[2]; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 455 | save[0] = *(sp++); |
| 456 | save[1] = *(sp++); |
| 457 | *(dp++) = *(sp++); |
| 458 | *(dp++) = *(sp++); |
| 459 | *(dp++) = save[0]; |
| 460 | *(dp++) = save[1]; |
| 461 | } |
| 462 | } |
Glenn Randers-Pehrson | 7d3e673 | 2010-08-26 17:14:07 -0500 | [diff] [blame] | 463 | #endif /* PNG_WRITE_16BIT_SUPPORTED */ |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 464 | } |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 465 | } |
| 466 | } |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 467 | #endif |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 468 | |
Glenn Randers-Pehrson | e26c095 | 2009-09-23 11:22:08 -0500 | [diff] [blame] | 469 | #ifdef PNG_WRITE_INVERT_ALPHA_SUPPORTED |
Glenn Randers-Pehrson | 7529457 | 2000-05-06 14:09:57 -0500 | [diff] [blame] | 470 | void /* PRIVATE */ |
Glenn Randers-Pehrson | c4a2ae6 | 1998-01-16 22:06:18 -0600 | [diff] [blame] | 471 | png_do_write_invert_alpha(png_row_infop row_info, png_bytep row) |
| 472 | { |
Glenn Randers-Pehrson | 51650b8 | 2008-08-05 07:44:42 -0500 | [diff] [blame] | 473 | png_debug(1, "in png_do_write_invert_alpha"); |
Glenn Randers-Pehrson | da00980 | 2009-08-15 13:25:47 -0500 | [diff] [blame] | 474 | |
Glenn Randers-Pehrson | c4a2ae6 | 1998-01-16 22:06:18 -0600 | [diff] [blame] | 475 | { |
| 476 | if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA) |
| 477 | { |
Glenn Randers-Pehrson | c4a2ae6 | 1998-01-16 22:06:18 -0600 | [diff] [blame] | 478 | if (row_info->bit_depth == 8) |
| 479 | { |
Glenn Randers-Pehrson | 45624d6 | 2010-03-03 11:40:43 -0600 | [diff] [blame] | 480 | /* This inverts the alpha channel in RGBA */ |
Glenn Randers-Pehrson | c4a2ae6 | 1998-01-16 22:06:18 -0600 | [diff] [blame] | 481 | png_bytep sp, dp; |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 482 | png_uint_32 i; |
| 483 | png_uint_32 row_width = row_info->width; |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 484 | |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 485 | for (i = 0, sp = dp = row; i < row_width; i++) |
Glenn Randers-Pehrson | c4a2ae6 | 1998-01-16 22:06:18 -0600 | [diff] [blame] | 486 | { |
Glenn Randers-Pehrson | 4bb4d01 | 2009-05-20 12:45:29 -0500 | [diff] [blame] | 487 | /* Does nothing |
Glenn Randers-Pehrson | c4a2ae6 | 1998-01-16 22:06:18 -0600 | [diff] [blame] | 488 | *(dp++) = *(sp++); |
| 489 | *(dp++) = *(sp++); |
| 490 | *(dp++) = *(sp++); |
Glenn Randers-Pehrson | 9c3ab68 | 2006-02-20 22:09:05 -0600 | [diff] [blame] | 491 | */ |
| 492 | sp+=3; dp = sp; |
Glenn Randers-Pehrson | 860ab2b | 1999-10-14 07:43:10 -0500 | [diff] [blame] | 493 | *(dp++) = (png_byte)(255 - *(sp++)); |
Glenn Randers-Pehrson | c4a2ae6 | 1998-01-16 22:06:18 -0600 | [diff] [blame] | 494 | } |
| 495 | } |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 496 | |
Glenn Randers-Pehrson | 7d3e673 | 2010-08-26 17:14:07 -0500 | [diff] [blame] | 497 | #ifdef PNG_WRITE_16BIT_SUPPORTED |
Glenn Randers-Pehrson | c4a2ae6 | 1998-01-16 22:06:18 -0600 | [diff] [blame] | 498 | else |
| 499 | { |
Glenn Randers-Pehrson | 45624d6 | 2010-03-03 11:40:43 -0600 | [diff] [blame] | 500 | /* This inverts the alpha channel in RRGGBBAA */ |
Glenn Randers-Pehrson | c4a2ae6 | 1998-01-16 22:06:18 -0600 | [diff] [blame] | 501 | png_bytep sp, dp; |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 502 | png_uint_32 i; |
| 503 | png_uint_32 row_width = row_info->width; |
Glenn Randers-Pehrson | c4a2ae6 | 1998-01-16 22:06:18 -0600 | [diff] [blame] | 504 | |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 505 | for (i = 0, sp = dp = row; i < row_width; i++) |
Glenn Randers-Pehrson | c4a2ae6 | 1998-01-16 22:06:18 -0600 | [diff] [blame] | 506 | { |
Glenn Randers-Pehrson | 4bb4d01 | 2009-05-20 12:45:29 -0500 | [diff] [blame] | 507 | /* Does nothing |
Glenn Randers-Pehrson | c4a2ae6 | 1998-01-16 22:06:18 -0600 | [diff] [blame] | 508 | *(dp++) = *(sp++); |
| 509 | *(dp++) = *(sp++); |
| 510 | *(dp++) = *(sp++); |
| 511 | *(dp++) = *(sp++); |
| 512 | *(dp++) = *(sp++); |
| 513 | *(dp++) = *(sp++); |
Glenn Randers-Pehrson | 9c3ab68 | 2006-02-20 22:09:05 -0600 | [diff] [blame] | 514 | */ |
| 515 | sp+=6; dp = sp; |
Glenn Randers-Pehrson | 860ab2b | 1999-10-14 07:43:10 -0500 | [diff] [blame] | 516 | *(dp++) = (png_byte)(255 - *(sp++)); |
| 517 | *(dp++) = (png_byte)(255 - *(sp++)); |
Glenn Randers-Pehrson | c4a2ae6 | 1998-01-16 22:06:18 -0600 | [diff] [blame] | 518 | } |
| 519 | } |
Glenn Randers-Pehrson | 7d3e673 | 2010-08-26 17:14:07 -0500 | [diff] [blame] | 520 | #endif /* PNG_WRITE_16BIT_SUPPORTED */ |
Glenn Randers-Pehrson | c4a2ae6 | 1998-01-16 22:06:18 -0600 | [diff] [blame] | 521 | } |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 522 | |
Glenn Randers-Pehrson | c4a2ae6 | 1998-01-16 22:06:18 -0600 | [diff] [blame] | 523 | else if (row_info->color_type == PNG_COLOR_TYPE_GRAY_ALPHA) |
| 524 | { |
Glenn Randers-Pehrson | c4a2ae6 | 1998-01-16 22:06:18 -0600 | [diff] [blame] | 525 | if (row_info->bit_depth == 8) |
| 526 | { |
Glenn Randers-Pehrson | 45624d6 | 2010-03-03 11:40:43 -0600 | [diff] [blame] | 527 | /* This inverts the alpha channel in GA */ |
Glenn Randers-Pehrson | c4a2ae6 | 1998-01-16 22:06:18 -0600 | [diff] [blame] | 528 | png_bytep sp, dp; |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 529 | png_uint_32 i; |
| 530 | png_uint_32 row_width = row_info->width; |
Glenn Randers-Pehrson | c4a2ae6 | 1998-01-16 22:06:18 -0600 | [diff] [blame] | 531 | |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 532 | for (i = 0, sp = dp = row; i < row_width; i++) |
Glenn Randers-Pehrson | c4a2ae6 | 1998-01-16 22:06:18 -0600 | [diff] [blame] | 533 | { |
| 534 | *(dp++) = *(sp++); |
Glenn Randers-Pehrson | 860ab2b | 1999-10-14 07:43:10 -0500 | [diff] [blame] | 535 | *(dp++) = (png_byte)(255 - *(sp++)); |
Glenn Randers-Pehrson | c4a2ae6 | 1998-01-16 22:06:18 -0600 | [diff] [blame] | 536 | } |
| 537 | } |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 538 | |
Glenn Randers-Pehrson | 7d3e673 | 2010-08-26 17:14:07 -0500 | [diff] [blame] | 539 | #ifdef PNG_WRITE_16BIT_SUPPORTED |
Glenn Randers-Pehrson | c4a2ae6 | 1998-01-16 22:06:18 -0600 | [diff] [blame] | 540 | else |
| 541 | { |
Glenn Randers-Pehrson | 45624d6 | 2010-03-03 11:40:43 -0600 | [diff] [blame] | 542 | /* This inverts the alpha channel in GGAA */ |
Glenn Randers-Pehrson | c4a2ae6 | 1998-01-16 22:06:18 -0600 | [diff] [blame] | 543 | png_bytep sp, dp; |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 544 | png_uint_32 i; |
| 545 | png_uint_32 row_width = row_info->width; |
Glenn Randers-Pehrson | c4a2ae6 | 1998-01-16 22:06:18 -0600 | [diff] [blame] | 546 | |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 547 | for (i = 0, sp = dp = row; i < row_width; i++) |
Glenn Randers-Pehrson | c4a2ae6 | 1998-01-16 22:06:18 -0600 | [diff] [blame] | 548 | { |
Glenn Randers-Pehrson | 4bb4d01 | 2009-05-20 12:45:29 -0500 | [diff] [blame] | 549 | /* Does nothing |
Glenn Randers-Pehrson | c4a2ae6 | 1998-01-16 22:06:18 -0600 | [diff] [blame] | 550 | *(dp++) = *(sp++); |
| 551 | *(dp++) = *(sp++); |
Glenn Randers-Pehrson | 9c3ab68 | 2006-02-20 22:09:05 -0600 | [diff] [blame] | 552 | */ |
| 553 | sp+=2; dp = sp; |
Glenn Randers-Pehrson | 860ab2b | 1999-10-14 07:43:10 -0500 | [diff] [blame] | 554 | *(dp++) = (png_byte)(255 - *(sp++)); |
| 555 | *(dp++) = (png_byte)(255 - *(sp++)); |
Glenn Randers-Pehrson | c4a2ae6 | 1998-01-16 22:06:18 -0600 | [diff] [blame] | 556 | } |
| 557 | } |
Glenn Randers-Pehrson | 7d3e673 | 2010-08-26 17:14:07 -0500 | [diff] [blame] | 558 | #endif /* PNG_WRITE_16BIT_SUPPORTED */ |
Glenn Randers-Pehrson | c4a2ae6 | 1998-01-16 22:06:18 -0600 | [diff] [blame] | 559 | } |
| 560 | } |
| 561 | } |
| 562 | #endif |
Glenn Randers-Pehrson | 2ad31ae | 2000-12-15 08:54:42 -0600 | [diff] [blame] | 563 | |
Glenn Randers-Pehrson | e26c095 | 2009-09-23 11:22:08 -0500 | [diff] [blame] | 564 | #ifdef PNG_MNG_FEATURES_SUPPORTED |
Glenn Randers-Pehrson | 4bb4d01 | 2009-05-20 12:45:29 -0500 | [diff] [blame] | 565 | /* Undoes intrapixel differencing */ |
Glenn Randers-Pehrson | 2ad31ae | 2000-12-15 08:54:42 -0600 | [diff] [blame] | 566 | void /* PRIVATE */ |
| 567 | png_do_write_intrapixel(png_row_infop row_info, png_bytep row) |
| 568 | { |
Glenn Randers-Pehrson | 51650b8 | 2008-08-05 07:44:42 -0500 | [diff] [blame] | 569 | png_debug(1, "in png_do_write_intrapixel"); |
Glenn Randers-Pehrson | da00980 | 2009-08-15 13:25:47 -0500 | [diff] [blame] | 570 | |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 571 | if ((row_info->color_type & PNG_COLOR_MASK_COLOR)) |
Glenn Randers-Pehrson | 2ad31ae | 2000-12-15 08:54:42 -0600 | [diff] [blame] | 572 | { |
| 573 | int bytes_per_pixel; |
| 574 | png_uint_32 row_width = row_info->width; |
| 575 | if (row_info->bit_depth == 8) |
| 576 | { |
| 577 | png_bytep rp; |
| 578 | png_uint_32 i; |
| 579 | |
| 580 | if (row_info->color_type == PNG_COLOR_TYPE_RGB) |
| 581 | bytes_per_pixel = 3; |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 582 | |
Glenn Randers-Pehrson | 2ad31ae | 2000-12-15 08:54:42 -0600 | [diff] [blame] | 583 | else if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA) |
| 584 | bytes_per_pixel = 4; |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 585 | |
Glenn Randers-Pehrson | 2ad31ae | 2000-12-15 08:54:42 -0600 | [diff] [blame] | 586 | else |
| 587 | return; |
| 588 | |
| 589 | for (i = 0, rp = row; i < row_width; i++, rp += bytes_per_pixel) |
| 590 | { |
Glenn Randers-Pehrson | 45624d6 | 2010-03-03 11:40:43 -0600 | [diff] [blame] | 591 | *(rp) = (png_byte)((*rp - *(rp + 1)) & 0xff); |
| 592 | *(rp + 2) = (png_byte)((*(rp + 2) - *(rp + 1)) & 0xff); |
Glenn Randers-Pehrson | 2ad31ae | 2000-12-15 08:54:42 -0600 | [diff] [blame] | 593 | } |
| 594 | } |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 595 | |
Glenn Randers-Pehrson | 7d3e673 | 2010-08-26 17:14:07 -0500 | [diff] [blame] | 596 | #ifdef PNG_WRITE_16BIT_SUPPORTED |
Glenn Randers-Pehrson | 2ad31ae | 2000-12-15 08:54:42 -0600 | [diff] [blame] | 597 | else if (row_info->bit_depth == 16) |
| 598 | { |
| 599 | png_bytep rp; |
| 600 | png_uint_32 i; |
| 601 | |
| 602 | if (row_info->color_type == PNG_COLOR_TYPE_RGB) |
| 603 | bytes_per_pixel = 6; |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 604 | |
Glenn Randers-Pehrson | 2ad31ae | 2000-12-15 08:54:42 -0600 | [diff] [blame] | 605 | else if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA) |
| 606 | bytes_per_pixel = 8; |
Glenn Randers-Pehrson | f24daf2 | 2010-05-06 09:44:04 -0500 | [diff] [blame] | 607 | |
Glenn Randers-Pehrson | 2ad31ae | 2000-12-15 08:54:42 -0600 | [diff] [blame] | 608 | else |
| 609 | return; |
| 610 | |
| 611 | for (i = 0, rp = row; i < row_width; i++, rp += bytes_per_pixel) |
| 612 | { |
Glenn Randers-Pehrson | 45624d6 | 2010-03-03 11:40:43 -0600 | [diff] [blame] | 613 | png_uint_32 s0 = (*(rp ) << 8) | *(rp + 1); |
| 614 | png_uint_32 s1 = (*(rp + 2) << 8) | *(rp + 3); |
| 615 | png_uint_32 s2 = (*(rp + 4) << 8) | *(rp + 5); |
Glenn Randers-Pehrson | 145f5c8 | 2008-07-10 09:13:13 -0500 | [diff] [blame] | 616 | png_uint_32 red = (png_uint_32)((s0 - s1) & 0xffffL); |
| 617 | png_uint_32 blue = (png_uint_32)((s2 - s1) & 0xffffL); |
Glenn Randers-Pehrson | 45624d6 | 2010-03-03 11:40:43 -0600 | [diff] [blame] | 618 | *(rp ) = (png_byte)((red >> 8) & 0xff); |
| 619 | *(rp + 1) = (png_byte)(red & 0xff); |
| 620 | *(rp + 4) = (png_byte)((blue >> 8) & 0xff); |
| 621 | *(rp + 5) = (png_byte)(blue & 0xff); |
Glenn Randers-Pehrson | 2ad31ae | 2000-12-15 08:54:42 -0600 | [diff] [blame] | 622 | } |
| 623 | } |
Glenn Randers-Pehrson | 7d3e673 | 2010-08-26 17:14:07 -0500 | [diff] [blame] | 624 | #endif /* PNG_WRITE_16BIT_SUPPORTED */ |
Glenn Randers-Pehrson | 2ad31ae | 2000-12-15 08:54:42 -0600 | [diff] [blame] | 625 | } |
| 626 | } |
| 627 | #endif /* PNG_MNG_FEATURES_SUPPORTED */ |
Glenn Randers-Pehrson | 3097f61 | 2001-05-07 14:52:45 -0500 | [diff] [blame] | 628 | #endif /* PNG_WRITE_SUPPORTED */ |