The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1 | |
| 2 | /* pngwtran.c - transforms the data in a row for PNG writers |
| 3 | * |
Alex Naidis | 3586ba4 | 2016-10-26 12:36:09 +0200 | [diff] [blame] | 4 | * Last changed in libpng 1.6.26 [October 20, 2016] |
Alex Naidis | 7a055fd | 2016-10-01 12:23:07 +0200 | [diff] [blame] | 5 | * Copyright (c) 1998-2002,2004,2006-2016 Glenn Randers-Pehrson |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [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.) |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 8 | * |
| 9 | * This code is released under the libpng license. |
| 10 | * For conditions of distribution and use, see the disclaimer |
| 11 | * and license in png.h |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 12 | */ |
| 13 | |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 14 | #include "pngpriv.h" |
| 15 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 16 | #ifdef PNG_WRITE_SUPPORTED |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 17 | #ifdef PNG_WRITE_TRANSFORMS_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 18 | |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 19 | #ifdef PNG_WRITE_PACK_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 20 | /* Pack pixels into bytes. Pass the true bit depth in bit_depth. The |
| 21 | * row_info bit depth should be 8 (one pixel per byte). The channels |
| 22 | * should be 1 (this only happens on grayscale and paletted images). |
| 23 | */ |
Sireesh Tripurari | b478e66 | 2014-05-09 15:15:10 +0530 | [diff] [blame] | 24 | static void |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 25 | png_do_pack(png_row_infop row_info, png_bytep row, png_uint_32 bit_depth) |
| 26 | { |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 27 | png_debug(1, "in png_do_pack"); |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 28 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 29 | if (row_info->bit_depth == 8 && |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 30 | row_info->channels == 1) |
| 31 | { |
| 32 | switch ((int)bit_depth) |
| 33 | { |
| 34 | case 1: |
| 35 | { |
| 36 | png_bytep sp, dp; |
| 37 | int mask, v; |
| 38 | png_uint_32 i; |
| 39 | png_uint_32 row_width = row_info->width; |
| 40 | |
| 41 | sp = row; |
| 42 | dp = row; |
| 43 | mask = 0x80; |
| 44 | v = 0; |
| 45 | |
| 46 | for (i = 0; i < row_width; i++) |
| 47 | { |
| 48 | if (*sp != 0) |
| 49 | v |= mask; |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 50 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 51 | sp++; |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 52 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 53 | if (mask > 1) |
| 54 | mask >>= 1; |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 55 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 56 | else |
| 57 | { |
| 58 | mask = 0x80; |
| 59 | *dp = (png_byte)v; |
| 60 | dp++; |
| 61 | v = 0; |
| 62 | } |
| 63 | } |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 64 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 65 | if (mask != 0x80) |
| 66 | *dp = (png_byte)v; |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 67 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 68 | break; |
| 69 | } |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 70 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 71 | case 2: |
| 72 | { |
| 73 | png_bytep sp, dp; |
Matt Sarett | 9b1fe63 | 2015-11-25 10:21:17 -0500 | [diff] [blame] | 74 | unsigned int shift; |
| 75 | int v; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 76 | png_uint_32 i; |
| 77 | png_uint_32 row_width = row_info->width; |
| 78 | |
| 79 | sp = row; |
| 80 | dp = row; |
| 81 | shift = 6; |
| 82 | v = 0; |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 83 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 84 | for (i = 0; i < row_width; i++) |
| 85 | { |
| 86 | png_byte value; |
| 87 | |
| 88 | value = (png_byte)(*sp & 0x03); |
| 89 | v |= (value << shift); |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 90 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 91 | if (shift == 0) |
| 92 | { |
| 93 | shift = 6; |
| 94 | *dp = (png_byte)v; |
| 95 | dp++; |
| 96 | v = 0; |
| 97 | } |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 98 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 99 | else |
| 100 | shift -= 2; |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 101 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 102 | sp++; |
| 103 | } |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 104 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 105 | if (shift != 6) |
| 106 | *dp = (png_byte)v; |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 107 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 108 | break; |
| 109 | } |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 110 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 111 | case 4: |
| 112 | { |
| 113 | png_bytep sp, dp; |
Matt Sarett | 9b1fe63 | 2015-11-25 10:21:17 -0500 | [diff] [blame] | 114 | unsigned int shift; |
| 115 | int v; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 116 | png_uint_32 i; |
| 117 | png_uint_32 row_width = row_info->width; |
| 118 | |
| 119 | sp = row; |
| 120 | dp = row; |
| 121 | shift = 4; |
| 122 | v = 0; |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 123 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 124 | for (i = 0; i < row_width; i++) |
| 125 | { |
| 126 | png_byte value; |
| 127 | |
| 128 | value = (png_byte)(*sp & 0x0f); |
| 129 | v |= (value << shift); |
| 130 | |
| 131 | if (shift == 0) |
| 132 | { |
| 133 | shift = 4; |
| 134 | *dp = (png_byte)v; |
| 135 | dp++; |
| 136 | v = 0; |
| 137 | } |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 138 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 139 | else |
| 140 | shift -= 4; |
| 141 | |
| 142 | sp++; |
| 143 | } |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 144 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 145 | if (shift != 4) |
| 146 | *dp = (png_byte)v; |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 147 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 148 | break; |
| 149 | } |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 150 | |
| 151 | default: |
| 152 | break; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 153 | } |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 154 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 155 | row_info->bit_depth = (png_byte)bit_depth; |
| 156 | row_info->pixel_depth = (png_byte)(bit_depth * row_info->channels); |
| 157 | row_info->rowbytes = PNG_ROWBYTES(row_info->pixel_depth, |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 158 | row_info->width); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 159 | } |
| 160 | } |
| 161 | #endif |
| 162 | |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 163 | #ifdef PNG_WRITE_SHIFT_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 164 | /* Shift pixel values to take advantage of whole range. Pass the |
| 165 | * true number of bits in bit_depth. The row should be packed |
| 166 | * according to row_info->bit_depth. Thus, if you had a row of |
| 167 | * bit depth 4, but the pixels only had values from 0 to 7, you |
| 168 | * would pass 3 as bit_depth, and this routine would translate the |
| 169 | * data to 0 to 15. |
| 170 | */ |
Sireesh Tripurari | b478e66 | 2014-05-09 15:15:10 +0530 | [diff] [blame] | 171 | static void |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 172 | png_do_shift(png_row_infop row_info, png_bytep row, |
| 173 | png_const_color_8p bit_depth) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 174 | { |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 175 | png_debug(1, "in png_do_shift"); |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 176 | |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 177 | if (row_info->color_type != PNG_COLOR_TYPE_PALETTE) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 178 | { |
| 179 | int shift_start[4], shift_dec[4]; |
Alex Naidis | 3586ba4 | 2016-10-26 12:36:09 +0200 | [diff] [blame] | 180 | unsigned int channels = 0; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 181 | |
Matt Sarett | 9b1fe63 | 2015-11-25 10:21:17 -0500 | [diff] [blame] | 182 | if ((row_info->color_type & PNG_COLOR_MASK_COLOR) != 0) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 183 | { |
| 184 | shift_start[channels] = row_info->bit_depth - bit_depth->red; |
| 185 | shift_dec[channels] = bit_depth->red; |
| 186 | channels++; |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 187 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 188 | shift_start[channels] = row_info->bit_depth - bit_depth->green; |
| 189 | shift_dec[channels] = bit_depth->green; |
| 190 | channels++; |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 191 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 192 | shift_start[channels] = row_info->bit_depth - bit_depth->blue; |
| 193 | shift_dec[channels] = bit_depth->blue; |
| 194 | channels++; |
| 195 | } |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 196 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 197 | else |
| 198 | { |
| 199 | shift_start[channels] = row_info->bit_depth - bit_depth->gray; |
| 200 | shift_dec[channels] = bit_depth->gray; |
| 201 | channels++; |
| 202 | } |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 203 | |
Matt Sarett | 9b1fe63 | 2015-11-25 10:21:17 -0500 | [diff] [blame] | 204 | if ((row_info->color_type & PNG_COLOR_MASK_ALPHA) != 0) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 205 | { |
| 206 | shift_start[channels] = row_info->bit_depth - bit_depth->alpha; |
| 207 | shift_dec[channels] = bit_depth->alpha; |
| 208 | channels++; |
| 209 | } |
| 210 | |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 211 | /* With low row depths, could only be grayscale, so one channel */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 212 | if (row_info->bit_depth < 8) |
| 213 | { |
| 214 | png_bytep bp = row; |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 215 | png_size_t i; |
| 216 | unsigned int mask; |
| 217 | png_size_t row_bytes = row_info->rowbytes; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 218 | |
| 219 | if (bit_depth->gray == 1 && row_info->bit_depth == 2) |
| 220 | mask = 0x55; |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 221 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 222 | else if (row_info->bit_depth == 4 && bit_depth->gray == 3) |
| 223 | mask = 0x11; |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 224 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 225 | else |
| 226 | mask = 0xff; |
| 227 | |
| 228 | for (i = 0; i < row_bytes; i++, bp++) |
| 229 | { |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 230 | int j; |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 231 | unsigned int v, out; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 232 | |
| 233 | v = *bp; |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 234 | out = 0; |
| 235 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 236 | for (j = shift_start[0]; j > -shift_dec[0]; j -= shift_dec[0]) |
| 237 | { |
| 238 | if (j > 0) |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 239 | out |= v << j; |
| 240 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 241 | else |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 242 | out |= (v >> (-j)) & mask; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 243 | } |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 244 | |
| 245 | *bp = (png_byte)(out & 0xff); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 246 | } |
| 247 | } |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 248 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 249 | else if (row_info->bit_depth == 8) |
| 250 | { |
| 251 | png_bytep bp = row; |
| 252 | png_uint_32 i; |
| 253 | png_uint_32 istop = channels * row_info->width; |
| 254 | |
| 255 | for (i = 0; i < istop; i++, bp++) |
| 256 | { |
| 257 | |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 258 | const unsigned int c = i%channels; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 259 | int j; |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 260 | unsigned int v, out; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 261 | |
| 262 | v = *bp; |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 263 | out = 0; |
| 264 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 265 | for (j = shift_start[c]; j > -shift_dec[c]; j -= shift_dec[c]) |
| 266 | { |
| 267 | if (j > 0) |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 268 | out |= v << j; |
| 269 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 270 | else |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 271 | out |= v >> (-j); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 272 | } |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 273 | |
| 274 | *bp = (png_byte)(out & 0xff); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 275 | } |
| 276 | } |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 277 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 278 | else |
| 279 | { |
| 280 | png_bytep bp; |
| 281 | png_uint_32 i; |
| 282 | png_uint_32 istop = channels * row_info->width; |
| 283 | |
| 284 | for (bp = row, i = 0; i < istop; i++) |
| 285 | { |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 286 | const unsigned int c = i%channels; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 287 | int j; |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 288 | unsigned int value, v; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 289 | |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 290 | v = png_get_uint_16(bp); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 291 | value = 0; |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 292 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 293 | for (j = shift_start[c]; j > -shift_dec[c]; j -= shift_dec[c]) |
| 294 | { |
| 295 | if (j > 0) |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 296 | value |= v << j; |
| 297 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 298 | else |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 299 | value |= v >> (-j); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 300 | } |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 301 | *bp++ = (png_byte)((value >> 8) & 0xff); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 302 | *bp++ = (png_byte)(value & 0xff); |
| 303 | } |
| 304 | } |
| 305 | } |
| 306 | } |
| 307 | #endif |
| 308 | |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 309 | #ifdef PNG_WRITE_SWAP_ALPHA_SUPPORTED |
Sireesh Tripurari | b478e66 | 2014-05-09 15:15:10 +0530 | [diff] [blame] | 310 | static void |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 311 | png_do_write_swap_alpha(png_row_infop row_info, png_bytep row) |
| 312 | { |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 313 | png_debug(1, "in png_do_write_swap_alpha"); |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 314 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 315 | { |
| 316 | if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA) |
| 317 | { |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 318 | if (row_info->bit_depth == 8) |
| 319 | { |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 320 | /* This converts from ARGB to RGBA */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 321 | png_bytep sp, dp; |
| 322 | png_uint_32 i; |
| 323 | png_uint_32 row_width = row_info->width; |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 324 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 325 | for (i = 0, sp = dp = row; i < row_width; i++) |
| 326 | { |
| 327 | png_byte save = *(sp++); |
| 328 | *(dp++) = *(sp++); |
| 329 | *(dp++) = *(sp++); |
| 330 | *(dp++) = *(sp++); |
| 331 | *(dp++) = save; |
| 332 | } |
| 333 | } |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 334 | |
| 335 | #ifdef PNG_WRITE_16BIT_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 336 | else |
| 337 | { |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 338 | /* This converts from AARRGGBB to RRGGBBAA */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 339 | png_bytep sp, dp; |
| 340 | png_uint_32 i; |
| 341 | png_uint_32 row_width = row_info->width; |
| 342 | |
| 343 | for (i = 0, sp = dp = row; i < row_width; i++) |
| 344 | { |
| 345 | png_byte save[2]; |
| 346 | save[0] = *(sp++); |
| 347 | save[1] = *(sp++); |
| 348 | *(dp++) = *(sp++); |
| 349 | *(dp++) = *(sp++); |
| 350 | *(dp++) = *(sp++); |
| 351 | *(dp++) = *(sp++); |
| 352 | *(dp++) = *(sp++); |
| 353 | *(dp++) = *(sp++); |
| 354 | *(dp++) = save[0]; |
| 355 | *(dp++) = save[1]; |
| 356 | } |
| 357 | } |
Matt Sarett | 9b1fe63 | 2015-11-25 10:21:17 -0500 | [diff] [blame] | 358 | #endif /* WRITE_16BIT */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 359 | } |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 360 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 361 | else if (row_info->color_type == PNG_COLOR_TYPE_GRAY_ALPHA) |
| 362 | { |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 363 | if (row_info->bit_depth == 8) |
| 364 | { |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 365 | /* This converts from AG to GA */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 366 | png_bytep sp, dp; |
| 367 | png_uint_32 i; |
| 368 | png_uint_32 row_width = row_info->width; |
| 369 | |
| 370 | for (i = 0, sp = dp = row; i < row_width; i++) |
| 371 | { |
| 372 | png_byte save = *(sp++); |
| 373 | *(dp++) = *(sp++); |
| 374 | *(dp++) = save; |
| 375 | } |
| 376 | } |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 377 | |
| 378 | #ifdef PNG_WRITE_16BIT_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 379 | else |
| 380 | { |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 381 | /* This converts from AAGG to GGAA */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 382 | png_bytep sp, dp; |
| 383 | png_uint_32 i; |
| 384 | png_uint_32 row_width = row_info->width; |
| 385 | |
| 386 | for (i = 0, sp = dp = row; i < row_width; i++) |
| 387 | { |
| 388 | png_byte save[2]; |
| 389 | save[0] = *(sp++); |
| 390 | save[1] = *(sp++); |
| 391 | *(dp++) = *(sp++); |
| 392 | *(dp++) = *(sp++); |
| 393 | *(dp++) = save[0]; |
| 394 | *(dp++) = save[1]; |
| 395 | } |
| 396 | } |
Matt Sarett | 9b1fe63 | 2015-11-25 10:21:17 -0500 | [diff] [blame] | 397 | #endif /* WRITE_16BIT */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 398 | } |
| 399 | } |
| 400 | } |
| 401 | #endif |
| 402 | |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 403 | #ifdef PNG_WRITE_INVERT_ALPHA_SUPPORTED |
Sireesh Tripurari | b478e66 | 2014-05-09 15:15:10 +0530 | [diff] [blame] | 404 | static void |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 405 | png_do_write_invert_alpha(png_row_infop row_info, png_bytep row) |
| 406 | { |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 407 | png_debug(1, "in png_do_write_invert_alpha"); |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 408 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 409 | { |
| 410 | if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA) |
| 411 | { |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 412 | if (row_info->bit_depth == 8) |
| 413 | { |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 414 | /* This inverts the alpha channel in RGBA */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 415 | png_bytep sp, dp; |
| 416 | png_uint_32 i; |
| 417 | png_uint_32 row_width = row_info->width; |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 418 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 419 | for (i = 0, sp = dp = row; i < row_width; i++) |
| 420 | { |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 421 | /* Does nothing |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 422 | *(dp++) = *(sp++); |
| 423 | *(dp++) = *(sp++); |
| 424 | *(dp++) = *(sp++); |
| 425 | */ |
| 426 | sp+=3; dp = sp; |
Matt Sarett | 9b1fe63 | 2015-11-25 10:21:17 -0500 | [diff] [blame] | 427 | *dp = (png_byte)(255 - *(sp++)); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 428 | } |
| 429 | } |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 430 | |
| 431 | #ifdef PNG_WRITE_16BIT_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 432 | else |
| 433 | { |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 434 | /* This inverts the alpha channel in RRGGBBAA */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 435 | png_bytep sp, dp; |
| 436 | png_uint_32 i; |
| 437 | png_uint_32 row_width = row_info->width; |
| 438 | |
| 439 | for (i = 0, sp = dp = row; i < row_width; i++) |
| 440 | { |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 441 | /* Does nothing |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 442 | *(dp++) = *(sp++); |
| 443 | *(dp++) = *(sp++); |
| 444 | *(dp++) = *(sp++); |
| 445 | *(dp++) = *(sp++); |
| 446 | *(dp++) = *(sp++); |
| 447 | *(dp++) = *(sp++); |
| 448 | */ |
| 449 | sp+=6; dp = sp; |
| 450 | *(dp++) = (png_byte)(255 - *(sp++)); |
Matt Sarett | 9b1fe63 | 2015-11-25 10:21:17 -0500 | [diff] [blame] | 451 | *dp = (png_byte)(255 - *(sp++)); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 452 | } |
| 453 | } |
Matt Sarett | 9b1fe63 | 2015-11-25 10:21:17 -0500 | [diff] [blame] | 454 | #endif /* WRITE_16BIT */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 455 | } |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 456 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 457 | else if (row_info->color_type == PNG_COLOR_TYPE_GRAY_ALPHA) |
| 458 | { |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 459 | if (row_info->bit_depth == 8) |
| 460 | { |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 461 | /* This inverts the alpha channel in GA */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 462 | png_bytep sp, dp; |
| 463 | png_uint_32 i; |
| 464 | png_uint_32 row_width = row_info->width; |
| 465 | |
| 466 | for (i = 0, sp = dp = row; i < row_width; i++) |
| 467 | { |
| 468 | *(dp++) = *(sp++); |
| 469 | *(dp++) = (png_byte)(255 - *(sp++)); |
| 470 | } |
| 471 | } |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 472 | |
| 473 | #ifdef PNG_WRITE_16BIT_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 474 | else |
| 475 | { |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 476 | /* This inverts the alpha channel in GGAA */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 477 | png_bytep sp, dp; |
| 478 | png_uint_32 i; |
| 479 | png_uint_32 row_width = row_info->width; |
| 480 | |
| 481 | for (i = 0, sp = dp = row; i < row_width; i++) |
| 482 | { |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 483 | /* Does nothing |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 484 | *(dp++) = *(sp++); |
| 485 | *(dp++) = *(sp++); |
| 486 | */ |
| 487 | sp+=2; dp = sp; |
| 488 | *(dp++) = (png_byte)(255 - *(sp++)); |
Matt Sarett | 9b1fe63 | 2015-11-25 10:21:17 -0500 | [diff] [blame] | 489 | *dp = (png_byte)(255 - *(sp++)); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 490 | } |
| 491 | } |
Matt Sarett | 9b1fe63 | 2015-11-25 10:21:17 -0500 | [diff] [blame] | 492 | #endif /* WRITE_16BIT */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 493 | } |
| 494 | } |
| 495 | } |
| 496 | #endif |
| 497 | |
Sireesh Tripurari | b478e66 | 2014-05-09 15:15:10 +0530 | [diff] [blame] | 498 | /* Transform the data according to the user's wishes. The order of |
| 499 | * transformations is significant. |
| 500 | */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 501 | void /* PRIVATE */ |
Sireesh Tripurari | b478e66 | 2014-05-09 15:15:10 +0530 | [diff] [blame] | 502 | png_do_write_transformations(png_structrp png_ptr, png_row_infop row_info) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 503 | { |
Sireesh Tripurari | b478e66 | 2014-05-09 15:15:10 +0530 | [diff] [blame] | 504 | png_debug(1, "in png_do_write_transformations"); |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 505 | |
Sireesh Tripurari | b478e66 | 2014-05-09 15:15:10 +0530 | [diff] [blame] | 506 | if (png_ptr == NULL) |
| 507 | return; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 508 | |
Sireesh Tripurari | b478e66 | 2014-05-09 15:15:10 +0530 | [diff] [blame] | 509 | #ifdef PNG_WRITE_USER_TRANSFORM_SUPPORTED |
Matt Sarett | 9b1fe63 | 2015-11-25 10:21:17 -0500 | [diff] [blame] | 510 | if ((png_ptr->transformations & PNG_USER_TRANSFORM) != 0) |
Sireesh Tripurari | b478e66 | 2014-05-09 15:15:10 +0530 | [diff] [blame] | 511 | if (png_ptr->write_user_transform_fn != NULL) |
| 512 | (*(png_ptr->write_user_transform_fn)) /* User write transform |
| 513 | function */ |
| 514 | (png_ptr, /* png_ptr */ |
| 515 | row_info, /* row_info: */ |
| 516 | /* png_uint_32 width; width of row */ |
| 517 | /* png_size_t rowbytes; number of bytes in row */ |
| 518 | /* png_byte color_type; color type of pixels */ |
| 519 | /* png_byte bit_depth; bit depth of samples */ |
| 520 | /* png_byte channels; number of channels (1-4) */ |
| 521 | /* png_byte pixel_depth; bits per pixel (depth*channels) */ |
| 522 | png_ptr->row_buf + 1); /* start of pixel data for row */ |
| 523 | #endif |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 524 | |
Sireesh Tripurari | b478e66 | 2014-05-09 15:15:10 +0530 | [diff] [blame] | 525 | #ifdef PNG_WRITE_FILLER_SUPPORTED |
Matt Sarett | 9b1fe63 | 2015-11-25 10:21:17 -0500 | [diff] [blame] | 526 | if ((png_ptr->transformations & PNG_FILLER) != 0) |
Sireesh Tripurari | b478e66 | 2014-05-09 15:15:10 +0530 | [diff] [blame] | 527 | png_do_strip_channel(row_info, png_ptr->row_buf + 1, |
Alex Naidis | 7a055fd | 2016-10-01 12:23:07 +0200 | [diff] [blame] | 528 | !(png_ptr->flags & PNG_FLAG_FILLER_AFTER)); |
Sireesh Tripurari | b478e66 | 2014-05-09 15:15:10 +0530 | [diff] [blame] | 529 | #endif |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 530 | |
Sireesh Tripurari | b478e66 | 2014-05-09 15:15:10 +0530 | [diff] [blame] | 531 | #ifdef PNG_WRITE_PACKSWAP_SUPPORTED |
Matt Sarett | 9b1fe63 | 2015-11-25 10:21:17 -0500 | [diff] [blame] | 532 | if ((png_ptr->transformations & PNG_PACKSWAP) != 0) |
Sireesh Tripurari | b478e66 | 2014-05-09 15:15:10 +0530 | [diff] [blame] | 533 | png_do_packswap(row_info, png_ptr->row_buf + 1); |
| 534 | #endif |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 535 | |
Sireesh Tripurari | b478e66 | 2014-05-09 15:15:10 +0530 | [diff] [blame] | 536 | #ifdef PNG_WRITE_PACK_SUPPORTED |
Matt Sarett | 9b1fe63 | 2015-11-25 10:21:17 -0500 | [diff] [blame] | 537 | if ((png_ptr->transformations & PNG_PACK) != 0) |
Sireesh Tripurari | b478e66 | 2014-05-09 15:15:10 +0530 | [diff] [blame] | 538 | png_do_pack(row_info, png_ptr->row_buf + 1, |
| 539 | (png_uint_32)png_ptr->bit_depth); |
| 540 | #endif |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 541 | |
Sireesh Tripurari | b478e66 | 2014-05-09 15:15:10 +0530 | [diff] [blame] | 542 | #ifdef PNG_WRITE_SWAP_SUPPORTED |
Matt Sarett | 9b1fe63 | 2015-11-25 10:21:17 -0500 | [diff] [blame] | 543 | # ifdef PNG_16BIT_SUPPORTED |
| 544 | if ((png_ptr->transformations & PNG_SWAP_BYTES) != 0) |
Sireesh Tripurari | b478e66 | 2014-05-09 15:15:10 +0530 | [diff] [blame] | 545 | png_do_swap(row_info, png_ptr->row_buf + 1); |
Matt Sarett | 9b1fe63 | 2015-11-25 10:21:17 -0500 | [diff] [blame] | 546 | # endif |
Sireesh Tripurari | b478e66 | 2014-05-09 15:15:10 +0530 | [diff] [blame] | 547 | #endif |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 548 | |
Sireesh Tripurari | b478e66 | 2014-05-09 15:15:10 +0530 | [diff] [blame] | 549 | #ifdef PNG_WRITE_SHIFT_SUPPORTED |
Matt Sarett | 9b1fe63 | 2015-11-25 10:21:17 -0500 | [diff] [blame] | 550 | if ((png_ptr->transformations & PNG_SHIFT) != 0) |
Sireesh Tripurari | b478e66 | 2014-05-09 15:15:10 +0530 | [diff] [blame] | 551 | png_do_shift(row_info, png_ptr->row_buf + 1, |
Alex Naidis | 7a055fd | 2016-10-01 12:23:07 +0200 | [diff] [blame] | 552 | &(png_ptr->shift)); |
Sireesh Tripurari | b478e66 | 2014-05-09 15:15:10 +0530 | [diff] [blame] | 553 | #endif |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 554 | |
Sireesh Tripurari | b478e66 | 2014-05-09 15:15:10 +0530 | [diff] [blame] | 555 | #ifdef PNG_WRITE_SWAP_ALPHA_SUPPORTED |
Matt Sarett | 9b1fe63 | 2015-11-25 10:21:17 -0500 | [diff] [blame] | 556 | if ((png_ptr->transformations & PNG_SWAP_ALPHA) != 0) |
Sireesh Tripurari | b478e66 | 2014-05-09 15:15:10 +0530 | [diff] [blame] | 557 | png_do_write_swap_alpha(row_info, png_ptr->row_buf + 1); |
| 558 | #endif |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 559 | |
Sireesh Tripurari | b478e66 | 2014-05-09 15:15:10 +0530 | [diff] [blame] | 560 | #ifdef PNG_WRITE_INVERT_ALPHA_SUPPORTED |
Matt Sarett | 9b1fe63 | 2015-11-25 10:21:17 -0500 | [diff] [blame] | 561 | if ((png_ptr->transformations & PNG_INVERT_ALPHA) != 0) |
Sireesh Tripurari | b478e66 | 2014-05-09 15:15:10 +0530 | [diff] [blame] | 562 | png_do_write_invert_alpha(row_info, png_ptr->row_buf + 1); |
| 563 | #endif |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 564 | |
Sireesh Tripurari | b478e66 | 2014-05-09 15:15:10 +0530 | [diff] [blame] | 565 | #ifdef PNG_WRITE_BGR_SUPPORTED |
Matt Sarett | 9b1fe63 | 2015-11-25 10:21:17 -0500 | [diff] [blame] | 566 | if ((png_ptr->transformations & PNG_BGR) != 0) |
Sireesh Tripurari | b478e66 | 2014-05-09 15:15:10 +0530 | [diff] [blame] | 567 | png_do_bgr(row_info, png_ptr->row_buf + 1); |
| 568 | #endif |
| 569 | |
| 570 | #ifdef PNG_WRITE_INVERT_SUPPORTED |
Matt Sarett | 9b1fe63 | 2015-11-25 10:21:17 -0500 | [diff] [blame] | 571 | if ((png_ptr->transformations & PNG_INVERT_MONO) != 0) |
Sireesh Tripurari | b478e66 | 2014-05-09 15:15:10 +0530 | [diff] [blame] | 572 | png_do_invert(row_info, png_ptr->row_buf + 1); |
| 573 | #endif |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 574 | } |
Matt Sarett | 9b1fe63 | 2015-11-25 10:21:17 -0500 | [diff] [blame] | 575 | #endif /* WRITE_TRANSFORMS */ |
| 576 | #endif /* WRITE */ |