The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1 | |
| 2 | /* pngtrans.c - transforms the data in a row (used by both readers and writers) |
| 3 | * |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame^] | 4 | * Last changed in libpng 1.6.2 [April 25, 2013] |
| 5 | * Copyright (c) 1998-2013 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 | #if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED) |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 17 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 18 | #if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED) |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 19 | /* Turn on BGR-to-RGB mapping */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 20 | void PNGAPI |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame^] | 21 | png_set_bgr(png_structrp png_ptr) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 22 | { |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 23 | png_debug(1, "in png_set_bgr"); |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 24 | |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 25 | if (png_ptr == NULL) |
| 26 | return; |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame^] | 27 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 28 | png_ptr->transformations |= PNG_BGR; |
| 29 | } |
| 30 | #endif |
| 31 | |
| 32 | #if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED) |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 33 | /* Turn on 16 bit byte swapping */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 34 | void PNGAPI |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame^] | 35 | png_set_swap(png_structrp png_ptr) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 36 | { |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 37 | png_debug(1, "in png_set_swap"); |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 38 | |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 39 | if (png_ptr == NULL) |
| 40 | return; |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame^] | 41 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 42 | if (png_ptr->bit_depth == 16) |
| 43 | png_ptr->transformations |= PNG_SWAP_BYTES; |
| 44 | } |
| 45 | #endif |
| 46 | |
| 47 | #if defined(PNG_READ_PACK_SUPPORTED) || defined(PNG_WRITE_PACK_SUPPORTED) |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 48 | /* Turn on pixel packing */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 49 | void PNGAPI |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame^] | 50 | png_set_packing(png_structrp png_ptr) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 51 | { |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 52 | png_debug(1, "in png_set_packing"); |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 53 | |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 54 | if (png_ptr == NULL) |
| 55 | return; |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame^] | 56 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 57 | if (png_ptr->bit_depth < 8) |
| 58 | { |
| 59 | png_ptr->transformations |= PNG_PACK; |
| 60 | png_ptr->usr_bit_depth = 8; |
| 61 | } |
| 62 | } |
| 63 | #endif |
| 64 | |
| 65 | #if defined(PNG_READ_PACKSWAP_SUPPORTED)||defined(PNG_WRITE_PACKSWAP_SUPPORTED) |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 66 | /* Turn on packed pixel swapping */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 67 | void PNGAPI |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame^] | 68 | png_set_packswap(png_structrp png_ptr) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 69 | { |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 70 | png_debug(1, "in png_set_packswap"); |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 71 | |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 72 | if (png_ptr == NULL) |
| 73 | return; |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame^] | 74 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 75 | if (png_ptr->bit_depth < 8) |
| 76 | png_ptr->transformations |= PNG_PACKSWAP; |
| 77 | } |
| 78 | #endif |
| 79 | |
| 80 | #if defined(PNG_READ_SHIFT_SUPPORTED) || defined(PNG_WRITE_SHIFT_SUPPORTED) |
| 81 | void PNGAPI |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame^] | 82 | png_set_shift(png_structrp png_ptr, png_const_color_8p true_bits) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 83 | { |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 84 | png_debug(1, "in png_set_shift"); |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 85 | |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 86 | if (png_ptr == NULL) |
| 87 | return; |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame^] | 88 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 89 | png_ptr->transformations |= PNG_SHIFT; |
| 90 | png_ptr->shift = *true_bits; |
| 91 | } |
| 92 | #endif |
| 93 | |
| 94 | #if defined(PNG_READ_INTERLACING_SUPPORTED) || \ |
| 95 | defined(PNG_WRITE_INTERLACING_SUPPORTED) |
| 96 | int PNGAPI |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame^] | 97 | png_set_interlace_handling(png_structrp png_ptr) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 98 | { |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 99 | png_debug(1, "in png_set_interlace handling"); |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 100 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 101 | if (png_ptr && png_ptr->interlaced) |
| 102 | { |
| 103 | png_ptr->transformations |= PNG_INTERLACE; |
| 104 | return (7); |
| 105 | } |
| 106 | |
| 107 | return (1); |
| 108 | } |
| 109 | #endif |
| 110 | |
| 111 | #if defined(PNG_READ_FILLER_SUPPORTED) || defined(PNG_WRITE_FILLER_SUPPORTED) |
| 112 | /* Add a filler byte on read, or remove a filler or alpha byte on write. |
| 113 | * The filler type has changed in v0.95 to allow future 2-byte fillers |
| 114 | * for 48-bit input data, as well as to avoid problems with some compilers |
| 115 | * that don't like bytes as parameters. |
| 116 | */ |
| 117 | void PNGAPI |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame^] | 118 | png_set_filler(png_structrp png_ptr, png_uint_32 filler, int filler_loc) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 119 | { |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 120 | png_debug(1, "in png_set_filler"); |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 121 | |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 122 | if (png_ptr == NULL) |
| 123 | return; |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame^] | 124 | |
| 125 | /* In libpng 1.6 it is possible to determine whether this is a read or write |
| 126 | * operation and therefore to do more checking here for a valid call. |
| 127 | */ |
| 128 | if (png_ptr->mode & PNG_IS_READ_STRUCT) |
| 129 | { |
| 130 | # ifdef PNG_READ_FILLER_SUPPORTED |
| 131 | /* On read png_set_filler is always valid, regardless of the base PNG |
| 132 | * format, because other transformations can give a format where the |
| 133 | * filler code can execute (basically an 8 or 16-bit component RGB or G |
| 134 | * format.) |
| 135 | * |
| 136 | * NOTE: usr_channels is not used by the read code! (This has led to |
| 137 | * confusion in the past.) The filler is only used in the read code. |
| 138 | */ |
| 139 | png_ptr->filler = (png_uint_16)filler; |
| 140 | # else |
| 141 | png_app_error(png_ptr, "png_set_filler not supported on read"); |
| 142 | PNG_UNUSED(filler) /* not used in the write case */ |
| 143 | return; |
| 144 | # endif |
| 145 | } |
| 146 | |
| 147 | else /* write */ |
| 148 | { |
| 149 | # ifdef PNG_WRITE_FILLER_SUPPORTED |
| 150 | /* On write the usr_channels parameter must be set correctly at the |
| 151 | * start to record the number of channels in the app-supplied data. |
| 152 | */ |
| 153 | switch (png_ptr->color_type) |
| 154 | { |
| 155 | case PNG_COLOR_TYPE_RGB: |
| 156 | png_ptr->usr_channels = 4; |
| 157 | break; |
| 158 | |
| 159 | case PNG_COLOR_TYPE_GRAY: |
| 160 | if (png_ptr->bit_depth >= 8) |
| 161 | { |
| 162 | png_ptr->usr_channels = 2; |
| 163 | break; |
| 164 | } |
| 165 | |
| 166 | else |
| 167 | { |
| 168 | /* There simply isn't any code in libpng to strip out bits |
| 169 | * from bytes when the components are less than a byte in |
| 170 | * size! |
| 171 | */ |
| 172 | png_app_error(png_ptr, |
| 173 | "png_set_filler is invalid for low bit depth gray output"); |
| 174 | return; |
| 175 | } |
| 176 | |
| 177 | default: |
| 178 | png_app_error(png_ptr, |
| 179 | "png_set_filler: inappropriate color type"); |
| 180 | return; |
| 181 | } |
| 182 | # else |
| 183 | png_app_error(png_ptr, "png_set_filler not supported on write"); |
| 184 | return; |
| 185 | # endif |
| 186 | } |
| 187 | |
| 188 | /* Here on success - libpng supports the operation, set the transformation |
| 189 | * and the flag to say where the filler channel is. |
| 190 | */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 191 | png_ptr->transformations |= PNG_FILLER; |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame^] | 192 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 193 | if (filler_loc == PNG_FILLER_AFTER) |
| 194 | png_ptr->flags |= PNG_FLAG_FILLER_AFTER; |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame^] | 195 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 196 | else |
| 197 | png_ptr->flags &= ~PNG_FLAG_FILLER_AFTER; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 198 | } |
| 199 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 200 | /* Added to libpng-1.2.7 */ |
| 201 | void PNGAPI |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame^] | 202 | png_set_add_alpha(png_structrp png_ptr, png_uint_32 filler, int filler_loc) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 203 | { |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 204 | png_debug(1, "in png_set_add_alpha"); |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 205 | |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 206 | if (png_ptr == NULL) |
| 207 | return; |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame^] | 208 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 209 | png_set_filler(png_ptr, filler, filler_loc); |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame^] | 210 | /* The above may fail to do anything. */ |
| 211 | if (png_ptr->transformations & PNG_FILLER) |
| 212 | png_ptr->transformations |= PNG_ADD_ALPHA; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 213 | } |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 214 | |
| 215 | #endif |
| 216 | |
| 217 | #if defined(PNG_READ_SWAP_ALPHA_SUPPORTED) || \ |
| 218 | defined(PNG_WRITE_SWAP_ALPHA_SUPPORTED) |
| 219 | void PNGAPI |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame^] | 220 | png_set_swap_alpha(png_structrp png_ptr) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 221 | { |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 222 | png_debug(1, "in png_set_swap_alpha"); |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 223 | |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 224 | if (png_ptr == NULL) |
| 225 | return; |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame^] | 226 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 227 | png_ptr->transformations |= PNG_SWAP_ALPHA; |
| 228 | } |
| 229 | #endif |
| 230 | |
| 231 | #if defined(PNG_READ_INVERT_ALPHA_SUPPORTED) || \ |
| 232 | defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED) |
| 233 | void PNGAPI |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame^] | 234 | png_set_invert_alpha(png_structrp png_ptr) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 235 | { |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 236 | png_debug(1, "in png_set_invert_alpha"); |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 237 | |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 238 | if (png_ptr == NULL) |
| 239 | return; |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame^] | 240 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 241 | png_ptr->transformations |= PNG_INVERT_ALPHA; |
| 242 | } |
| 243 | #endif |
| 244 | |
| 245 | #if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED) |
| 246 | void PNGAPI |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame^] | 247 | png_set_invert_mono(png_structrp png_ptr) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 248 | { |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 249 | png_debug(1, "in png_set_invert_mono"); |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 250 | |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 251 | if (png_ptr == NULL) |
| 252 | return; |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame^] | 253 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 254 | png_ptr->transformations |= PNG_INVERT_MONO; |
| 255 | } |
| 256 | |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 257 | /* Invert monochrome grayscale data */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 258 | void /* PRIVATE */ |
| 259 | png_do_invert(png_row_infop row_info, png_bytep row) |
| 260 | { |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 261 | png_debug(1, "in png_do_invert"); |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 262 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 263 | /* This test removed from libpng version 1.0.13 and 1.2.0: |
| 264 | * if (row_info->bit_depth == 1 && |
| 265 | */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 266 | if (row_info->color_type == PNG_COLOR_TYPE_GRAY) |
| 267 | { |
| 268 | png_bytep rp = row; |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame^] | 269 | png_size_t i; |
| 270 | png_size_t istop = row_info->rowbytes; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 271 | |
| 272 | for (i = 0; i < istop; i++) |
| 273 | { |
| 274 | *rp = (png_byte)(~(*rp)); |
| 275 | rp++; |
| 276 | } |
| 277 | } |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame^] | 278 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 279 | else if (row_info->color_type == PNG_COLOR_TYPE_GRAY_ALPHA && |
| 280 | row_info->bit_depth == 8) |
| 281 | { |
| 282 | png_bytep rp = row; |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame^] | 283 | png_size_t i; |
| 284 | png_size_t istop = row_info->rowbytes; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 285 | |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame^] | 286 | for (i = 0; i < istop; i += 2) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 287 | { |
| 288 | *rp = (png_byte)(~(*rp)); |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame^] | 289 | rp += 2; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 290 | } |
| 291 | } |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame^] | 292 | |
| 293 | #ifdef PNG_16BIT_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 294 | else if (row_info->color_type == PNG_COLOR_TYPE_GRAY_ALPHA && |
| 295 | row_info->bit_depth == 16) |
| 296 | { |
| 297 | png_bytep rp = row; |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame^] | 298 | png_size_t i; |
| 299 | png_size_t istop = row_info->rowbytes; |
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 | for (i = 0; i < istop; i += 4) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 302 | { |
| 303 | *rp = (png_byte)(~(*rp)); |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame^] | 304 | *(rp + 1) = (png_byte)(~(*(rp + 1))); |
| 305 | rp += 4; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 306 | } |
| 307 | } |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame^] | 308 | #endif |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 309 | } |
| 310 | #endif |
| 311 | |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame^] | 312 | #ifdef PNG_16BIT_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 313 | #if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED) |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 314 | /* Swaps byte order on 16 bit depth images */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 315 | void /* PRIVATE */ |
| 316 | png_do_swap(png_row_infop row_info, png_bytep row) |
| 317 | { |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 318 | png_debug(1, "in png_do_swap"); |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 319 | |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame^] | 320 | if (row_info->bit_depth == 16) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 321 | { |
| 322 | png_bytep rp = row; |
| 323 | png_uint_32 i; |
| 324 | png_uint_32 istop= row_info->width * row_info->channels; |
| 325 | |
| 326 | for (i = 0; i < istop; i++, rp += 2) |
| 327 | { |
| 328 | png_byte t = *rp; |
| 329 | *rp = *(rp + 1); |
| 330 | *(rp + 1) = t; |
| 331 | } |
| 332 | } |
| 333 | } |
| 334 | #endif |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame^] | 335 | #endif |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 336 | |
| 337 | #if defined(PNG_READ_PACKSWAP_SUPPORTED)||defined(PNG_WRITE_PACKSWAP_SUPPORTED) |
| 338 | static PNG_CONST png_byte onebppswaptable[256] = { |
| 339 | 0x00, 0x80, 0x40, 0xC0, 0x20, 0xA0, 0x60, 0xE0, |
| 340 | 0x10, 0x90, 0x50, 0xD0, 0x30, 0xB0, 0x70, 0xF0, |
| 341 | 0x08, 0x88, 0x48, 0xC8, 0x28, 0xA8, 0x68, 0xE8, |
| 342 | 0x18, 0x98, 0x58, 0xD8, 0x38, 0xB8, 0x78, 0xF8, |
| 343 | 0x04, 0x84, 0x44, 0xC4, 0x24, 0xA4, 0x64, 0xE4, |
| 344 | 0x14, 0x94, 0x54, 0xD4, 0x34, 0xB4, 0x74, 0xF4, |
| 345 | 0x0C, 0x8C, 0x4C, 0xCC, 0x2C, 0xAC, 0x6C, 0xEC, |
| 346 | 0x1C, 0x9C, 0x5C, 0xDC, 0x3C, 0xBC, 0x7C, 0xFC, |
| 347 | 0x02, 0x82, 0x42, 0xC2, 0x22, 0xA2, 0x62, 0xE2, |
| 348 | 0x12, 0x92, 0x52, 0xD2, 0x32, 0xB2, 0x72, 0xF2, |
| 349 | 0x0A, 0x8A, 0x4A, 0xCA, 0x2A, 0xAA, 0x6A, 0xEA, |
| 350 | 0x1A, 0x9A, 0x5A, 0xDA, 0x3A, 0xBA, 0x7A, 0xFA, |
| 351 | 0x06, 0x86, 0x46, 0xC6, 0x26, 0xA6, 0x66, 0xE6, |
| 352 | 0x16, 0x96, 0x56, 0xD6, 0x36, 0xB6, 0x76, 0xF6, |
| 353 | 0x0E, 0x8E, 0x4E, 0xCE, 0x2E, 0xAE, 0x6E, 0xEE, |
| 354 | 0x1E, 0x9E, 0x5E, 0xDE, 0x3E, 0xBE, 0x7E, 0xFE, |
| 355 | 0x01, 0x81, 0x41, 0xC1, 0x21, 0xA1, 0x61, 0xE1, |
| 356 | 0x11, 0x91, 0x51, 0xD1, 0x31, 0xB1, 0x71, 0xF1, |
| 357 | 0x09, 0x89, 0x49, 0xC9, 0x29, 0xA9, 0x69, 0xE9, |
| 358 | 0x19, 0x99, 0x59, 0xD9, 0x39, 0xB9, 0x79, 0xF9, |
| 359 | 0x05, 0x85, 0x45, 0xC5, 0x25, 0xA5, 0x65, 0xE5, |
| 360 | 0x15, 0x95, 0x55, 0xD5, 0x35, 0xB5, 0x75, 0xF5, |
| 361 | 0x0D, 0x8D, 0x4D, 0xCD, 0x2D, 0xAD, 0x6D, 0xED, |
| 362 | 0x1D, 0x9D, 0x5D, 0xDD, 0x3D, 0xBD, 0x7D, 0xFD, |
| 363 | 0x03, 0x83, 0x43, 0xC3, 0x23, 0xA3, 0x63, 0xE3, |
| 364 | 0x13, 0x93, 0x53, 0xD3, 0x33, 0xB3, 0x73, 0xF3, |
| 365 | 0x0B, 0x8B, 0x4B, 0xCB, 0x2B, 0xAB, 0x6B, 0xEB, |
| 366 | 0x1B, 0x9B, 0x5B, 0xDB, 0x3B, 0xBB, 0x7B, 0xFB, |
| 367 | 0x07, 0x87, 0x47, 0xC7, 0x27, 0xA7, 0x67, 0xE7, |
| 368 | 0x17, 0x97, 0x57, 0xD7, 0x37, 0xB7, 0x77, 0xF7, |
| 369 | 0x0F, 0x8F, 0x4F, 0xCF, 0x2F, 0xAF, 0x6F, 0xEF, |
| 370 | 0x1F, 0x9F, 0x5F, 0xDF, 0x3F, 0xBF, 0x7F, 0xFF |
| 371 | }; |
| 372 | |
| 373 | static PNG_CONST png_byte twobppswaptable[256] = { |
| 374 | 0x00, 0x40, 0x80, 0xC0, 0x10, 0x50, 0x90, 0xD0, |
| 375 | 0x20, 0x60, 0xA0, 0xE0, 0x30, 0x70, 0xB0, 0xF0, |
| 376 | 0x04, 0x44, 0x84, 0xC4, 0x14, 0x54, 0x94, 0xD4, |
| 377 | 0x24, 0x64, 0xA4, 0xE4, 0x34, 0x74, 0xB4, 0xF4, |
| 378 | 0x08, 0x48, 0x88, 0xC8, 0x18, 0x58, 0x98, 0xD8, |
| 379 | 0x28, 0x68, 0xA8, 0xE8, 0x38, 0x78, 0xB8, 0xF8, |
| 380 | 0x0C, 0x4C, 0x8C, 0xCC, 0x1C, 0x5C, 0x9C, 0xDC, |
| 381 | 0x2C, 0x6C, 0xAC, 0xEC, 0x3C, 0x7C, 0xBC, 0xFC, |
| 382 | 0x01, 0x41, 0x81, 0xC1, 0x11, 0x51, 0x91, 0xD1, |
| 383 | 0x21, 0x61, 0xA1, 0xE1, 0x31, 0x71, 0xB1, 0xF1, |
| 384 | 0x05, 0x45, 0x85, 0xC5, 0x15, 0x55, 0x95, 0xD5, |
| 385 | 0x25, 0x65, 0xA5, 0xE5, 0x35, 0x75, 0xB5, 0xF5, |
| 386 | 0x09, 0x49, 0x89, 0xC9, 0x19, 0x59, 0x99, 0xD9, |
| 387 | 0x29, 0x69, 0xA9, 0xE9, 0x39, 0x79, 0xB9, 0xF9, |
| 388 | 0x0D, 0x4D, 0x8D, 0xCD, 0x1D, 0x5D, 0x9D, 0xDD, |
| 389 | 0x2D, 0x6D, 0xAD, 0xED, 0x3D, 0x7D, 0xBD, 0xFD, |
| 390 | 0x02, 0x42, 0x82, 0xC2, 0x12, 0x52, 0x92, 0xD2, |
| 391 | 0x22, 0x62, 0xA2, 0xE2, 0x32, 0x72, 0xB2, 0xF2, |
| 392 | 0x06, 0x46, 0x86, 0xC6, 0x16, 0x56, 0x96, 0xD6, |
| 393 | 0x26, 0x66, 0xA6, 0xE6, 0x36, 0x76, 0xB6, 0xF6, |
| 394 | 0x0A, 0x4A, 0x8A, 0xCA, 0x1A, 0x5A, 0x9A, 0xDA, |
| 395 | 0x2A, 0x6A, 0xAA, 0xEA, 0x3A, 0x7A, 0xBA, 0xFA, |
| 396 | 0x0E, 0x4E, 0x8E, 0xCE, 0x1E, 0x5E, 0x9E, 0xDE, |
| 397 | 0x2E, 0x6E, 0xAE, 0xEE, 0x3E, 0x7E, 0xBE, 0xFE, |
| 398 | 0x03, 0x43, 0x83, 0xC3, 0x13, 0x53, 0x93, 0xD3, |
| 399 | 0x23, 0x63, 0xA3, 0xE3, 0x33, 0x73, 0xB3, 0xF3, |
| 400 | 0x07, 0x47, 0x87, 0xC7, 0x17, 0x57, 0x97, 0xD7, |
| 401 | 0x27, 0x67, 0xA7, 0xE7, 0x37, 0x77, 0xB7, 0xF7, |
| 402 | 0x0B, 0x4B, 0x8B, 0xCB, 0x1B, 0x5B, 0x9B, 0xDB, |
| 403 | 0x2B, 0x6B, 0xAB, 0xEB, 0x3B, 0x7B, 0xBB, 0xFB, |
| 404 | 0x0F, 0x4F, 0x8F, 0xCF, 0x1F, 0x5F, 0x9F, 0xDF, |
| 405 | 0x2F, 0x6F, 0xAF, 0xEF, 0x3F, 0x7F, 0xBF, 0xFF |
| 406 | }; |
| 407 | |
| 408 | static PNG_CONST png_byte fourbppswaptable[256] = { |
| 409 | 0x00, 0x10, 0x20, 0x30, 0x40, 0x50, 0x60, 0x70, |
| 410 | 0x80, 0x90, 0xA0, 0xB0, 0xC0, 0xD0, 0xE0, 0xF0, |
| 411 | 0x01, 0x11, 0x21, 0x31, 0x41, 0x51, 0x61, 0x71, |
| 412 | 0x81, 0x91, 0xA1, 0xB1, 0xC1, 0xD1, 0xE1, 0xF1, |
| 413 | 0x02, 0x12, 0x22, 0x32, 0x42, 0x52, 0x62, 0x72, |
| 414 | 0x82, 0x92, 0xA2, 0xB2, 0xC2, 0xD2, 0xE2, 0xF2, |
| 415 | 0x03, 0x13, 0x23, 0x33, 0x43, 0x53, 0x63, 0x73, |
| 416 | 0x83, 0x93, 0xA3, 0xB3, 0xC3, 0xD3, 0xE3, 0xF3, |
| 417 | 0x04, 0x14, 0x24, 0x34, 0x44, 0x54, 0x64, 0x74, |
| 418 | 0x84, 0x94, 0xA4, 0xB4, 0xC4, 0xD4, 0xE4, 0xF4, |
| 419 | 0x05, 0x15, 0x25, 0x35, 0x45, 0x55, 0x65, 0x75, |
| 420 | 0x85, 0x95, 0xA5, 0xB5, 0xC5, 0xD5, 0xE5, 0xF5, |
| 421 | 0x06, 0x16, 0x26, 0x36, 0x46, 0x56, 0x66, 0x76, |
| 422 | 0x86, 0x96, 0xA6, 0xB6, 0xC6, 0xD6, 0xE6, 0xF6, |
| 423 | 0x07, 0x17, 0x27, 0x37, 0x47, 0x57, 0x67, 0x77, |
| 424 | 0x87, 0x97, 0xA7, 0xB7, 0xC7, 0xD7, 0xE7, 0xF7, |
| 425 | 0x08, 0x18, 0x28, 0x38, 0x48, 0x58, 0x68, 0x78, |
| 426 | 0x88, 0x98, 0xA8, 0xB8, 0xC8, 0xD8, 0xE8, 0xF8, |
| 427 | 0x09, 0x19, 0x29, 0x39, 0x49, 0x59, 0x69, 0x79, |
| 428 | 0x89, 0x99, 0xA9, 0xB9, 0xC9, 0xD9, 0xE9, 0xF9, |
| 429 | 0x0A, 0x1A, 0x2A, 0x3A, 0x4A, 0x5A, 0x6A, 0x7A, |
| 430 | 0x8A, 0x9A, 0xAA, 0xBA, 0xCA, 0xDA, 0xEA, 0xFA, |
| 431 | 0x0B, 0x1B, 0x2B, 0x3B, 0x4B, 0x5B, 0x6B, 0x7B, |
| 432 | 0x8B, 0x9B, 0xAB, 0xBB, 0xCB, 0xDB, 0xEB, 0xFB, |
| 433 | 0x0C, 0x1C, 0x2C, 0x3C, 0x4C, 0x5C, 0x6C, 0x7C, |
| 434 | 0x8C, 0x9C, 0xAC, 0xBC, 0xCC, 0xDC, 0xEC, 0xFC, |
| 435 | 0x0D, 0x1D, 0x2D, 0x3D, 0x4D, 0x5D, 0x6D, 0x7D, |
| 436 | 0x8D, 0x9D, 0xAD, 0xBD, 0xCD, 0xDD, 0xED, 0xFD, |
| 437 | 0x0E, 0x1E, 0x2E, 0x3E, 0x4E, 0x5E, 0x6E, 0x7E, |
| 438 | 0x8E, 0x9E, 0xAE, 0xBE, 0xCE, 0xDE, 0xEE, 0xFE, |
| 439 | 0x0F, 0x1F, 0x2F, 0x3F, 0x4F, 0x5F, 0x6F, 0x7F, |
| 440 | 0x8F, 0x9F, 0xAF, 0xBF, 0xCF, 0xDF, 0xEF, 0xFF |
| 441 | }; |
| 442 | |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 443 | /* Swaps pixel packing order within bytes */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 444 | void /* PRIVATE */ |
| 445 | png_do_packswap(png_row_infop row_info, png_bytep row) |
| 446 | { |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 447 | png_debug(1, "in png_do_packswap"); |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 448 | |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame^] | 449 | if (row_info->bit_depth < 8) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 450 | { |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame^] | 451 | png_bytep rp; |
| 452 | png_const_bytep end, table; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 453 | |
| 454 | end = row + row_info->rowbytes; |
| 455 | |
| 456 | if (row_info->bit_depth == 1) |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame^] | 457 | table = onebppswaptable; |
| 458 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 459 | else if (row_info->bit_depth == 2) |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame^] | 460 | table = twobppswaptable; |
| 461 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 462 | else if (row_info->bit_depth == 4) |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame^] | 463 | table = fourbppswaptable; |
| 464 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 465 | else |
| 466 | return; |
| 467 | |
| 468 | for (rp = row; rp < end; rp++) |
| 469 | *rp = table[*rp]; |
| 470 | } |
| 471 | } |
| 472 | #endif /* PNG_READ_PACKSWAP_SUPPORTED or PNG_WRITE_PACKSWAP_SUPPORTED */ |
| 473 | |
| 474 | #if defined(PNG_WRITE_FILLER_SUPPORTED) || \ |
| 475 | defined(PNG_READ_STRIP_ALPHA_SUPPORTED) |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame^] | 476 | /* Remove a channel - this used to be 'png_do_strip_filler' but it used a |
| 477 | * somewhat weird combination of flags to determine what to do. All the calls |
| 478 | * to png_do_strip_filler are changed in 1.5.2 to call this instead with the |
| 479 | * correct arguments. |
| 480 | * |
| 481 | * The routine isn't general - the channel must be the channel at the start or |
| 482 | * end (not in the middle) of each pixel. |
| 483 | */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 484 | void /* PRIVATE */ |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame^] | 485 | png_do_strip_channel(png_row_infop row_info, png_bytep row, int at_start) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 486 | { |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame^] | 487 | png_bytep sp = row; /* source pointer */ |
| 488 | png_bytep dp = row; /* destination pointer */ |
| 489 | png_bytep ep = row + row_info->rowbytes; /* One beyond end of row */ |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 490 | |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame^] | 491 | /* At the start sp will point to the first byte to copy and dp to where |
| 492 | * it is copied to. ep always points just beyond the end of the row, so |
| 493 | * the loop simply copies (channels-1) channels until sp reaches ep. |
| 494 | * |
| 495 | * at_start: 0 -- convert AG, XG, ARGB, XRGB, AAGG, XXGG, etc. |
| 496 | * nonzero -- convert GA, GX, RGBA, RGBX, GGAA, RRGGBBXX, etc. |
| 497 | */ |
| 498 | |
| 499 | /* GA, GX, XG cases */ |
| 500 | if (row_info->channels == 2) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 501 | { |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame^] | 502 | if (row_info->bit_depth == 8) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 503 | { |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame^] | 504 | if (at_start) /* Skip initial filler */ |
| 505 | ++sp; |
| 506 | else /* Skip initial channel and, for sp, the filler */ |
| 507 | sp += 2, ++dp; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 508 | |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame^] | 509 | /* For a 1 pixel wide image there is nothing to do */ |
| 510 | while (sp < ep) |
| 511 | *dp++ = *sp, sp += 2; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 512 | |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame^] | 513 | row_info->pixel_depth = 8; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 514 | } |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame^] | 515 | |
| 516 | else if (row_info->bit_depth == 16) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 517 | { |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame^] | 518 | if (at_start) /* Skip initial filler */ |
| 519 | sp += 2; |
| 520 | else /* Skip initial channel and, for sp, the filler */ |
| 521 | sp += 4, dp += 2; |
| 522 | |
| 523 | while (sp < ep) |
| 524 | *dp++ = *sp++, *dp++ = *sp, sp += 3; |
| 525 | |
| 526 | row_info->pixel_depth = 16; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 527 | } |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame^] | 528 | |
| 529 | else |
| 530 | return; /* bad bit depth */ |
| 531 | |
| 532 | row_info->channels = 1; |
| 533 | |
| 534 | /* Finally fix the color type if it records an alpha channel */ |
| 535 | if (row_info->color_type == PNG_COLOR_TYPE_GRAY_ALPHA) |
| 536 | row_info->color_type = PNG_COLOR_TYPE_GRAY; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 537 | } |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame^] | 538 | |
| 539 | /* RGBA, RGBX, XRGB cases */ |
| 540 | else if (row_info->channels == 4) |
| 541 | { |
| 542 | if (row_info->bit_depth == 8) |
| 543 | { |
| 544 | if (at_start) /* Skip initial filler */ |
| 545 | ++sp; |
| 546 | else /* Skip initial channels and, for sp, the filler */ |
| 547 | sp += 4, dp += 3; |
| 548 | |
| 549 | /* Note that the loop adds 3 to dp and 4 to sp each time. */ |
| 550 | while (sp < ep) |
| 551 | *dp++ = *sp++, *dp++ = *sp++, *dp++ = *sp, sp += 2; |
| 552 | |
| 553 | row_info->pixel_depth = 24; |
| 554 | } |
| 555 | |
| 556 | else if (row_info->bit_depth == 16) |
| 557 | { |
| 558 | if (at_start) /* Skip initial filler */ |
| 559 | sp += 2; |
| 560 | else /* Skip initial channels and, for sp, the filler */ |
| 561 | sp += 8, dp += 6; |
| 562 | |
| 563 | while (sp < ep) |
| 564 | { |
| 565 | /* Copy 6 bytes, skip 2 */ |
| 566 | *dp++ = *sp++, *dp++ = *sp++; |
| 567 | *dp++ = *sp++, *dp++ = *sp++; |
| 568 | *dp++ = *sp++, *dp++ = *sp, sp += 3; |
| 569 | } |
| 570 | |
| 571 | row_info->pixel_depth = 48; |
| 572 | } |
| 573 | |
| 574 | else |
| 575 | return; /* bad bit depth */ |
| 576 | |
| 577 | row_info->channels = 3; |
| 578 | |
| 579 | /* Finally fix the color type if it records an alpha channel */ |
| 580 | if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA) |
| 581 | row_info->color_type = PNG_COLOR_TYPE_RGB; |
| 582 | } |
| 583 | |
| 584 | else |
| 585 | return; /* The filler channel has gone already */ |
| 586 | |
| 587 | /* Fix the rowbytes value. */ |
| 588 | row_info->rowbytes = dp-row; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 589 | } |
| 590 | #endif |
| 591 | |
| 592 | #if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED) |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 593 | /* Swaps red and blue bytes within a pixel */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 594 | void /* PRIVATE */ |
| 595 | png_do_bgr(png_row_infop row_info, png_bytep row) |
| 596 | { |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 597 | png_debug(1, "in png_do_bgr"); |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 598 | |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame^] | 599 | if ((row_info->color_type & PNG_COLOR_MASK_COLOR)) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 600 | { |
| 601 | png_uint_32 row_width = row_info->width; |
| 602 | if (row_info->bit_depth == 8) |
| 603 | { |
| 604 | if (row_info->color_type == PNG_COLOR_TYPE_RGB) |
| 605 | { |
| 606 | png_bytep rp; |
| 607 | png_uint_32 i; |
| 608 | |
| 609 | for (i = 0, rp = row; i < row_width; i++, rp += 3) |
| 610 | { |
| 611 | png_byte save = *rp; |
| 612 | *rp = *(rp + 2); |
| 613 | *(rp + 2) = save; |
| 614 | } |
| 615 | } |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame^] | 616 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 617 | else if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA) |
| 618 | { |
| 619 | png_bytep rp; |
| 620 | png_uint_32 i; |
| 621 | |
| 622 | for (i = 0, rp = row; i < row_width; i++, rp += 4) |
| 623 | { |
| 624 | png_byte save = *rp; |
| 625 | *rp = *(rp + 2); |
| 626 | *(rp + 2) = save; |
| 627 | } |
| 628 | } |
| 629 | } |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame^] | 630 | |
| 631 | #ifdef PNG_16BIT_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 632 | else if (row_info->bit_depth == 16) |
| 633 | { |
| 634 | if (row_info->color_type == PNG_COLOR_TYPE_RGB) |
| 635 | { |
| 636 | png_bytep rp; |
| 637 | png_uint_32 i; |
| 638 | |
| 639 | for (i = 0, rp = row; i < row_width; i++, rp += 6) |
| 640 | { |
| 641 | png_byte save = *rp; |
| 642 | *rp = *(rp + 4); |
| 643 | *(rp + 4) = save; |
| 644 | save = *(rp + 1); |
| 645 | *(rp + 1) = *(rp + 5); |
| 646 | *(rp + 5) = save; |
| 647 | } |
| 648 | } |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame^] | 649 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 650 | else if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA) |
| 651 | { |
| 652 | png_bytep rp; |
| 653 | png_uint_32 i; |
| 654 | |
| 655 | for (i = 0, rp = row; i < row_width; i++, rp += 8) |
| 656 | { |
| 657 | png_byte save = *rp; |
| 658 | *rp = *(rp + 4); |
| 659 | *(rp + 4) = save; |
| 660 | save = *(rp + 1); |
| 661 | *(rp + 1) = *(rp + 5); |
| 662 | *(rp + 5) = save; |
| 663 | } |
| 664 | } |
| 665 | } |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame^] | 666 | #endif |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 667 | } |
| 668 | } |
| 669 | #endif /* PNG_READ_BGR_SUPPORTED or PNG_WRITE_BGR_SUPPORTED */ |
| 670 | |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame^] | 671 | #if defined(PNG_READ_CHECK_FOR_INVALID_INDEX_SUPPORTED) || \ |
| 672 | defined(PNG_WRITE_CHECK_FOR_INVALID_INDEX_SUPPORTED) |
| 673 | /* Added at libpng-1.5.10 */ |
| 674 | void /* PRIVATE */ |
| 675 | png_do_check_palette_indexes(png_structrp png_ptr, png_row_infop row_info) |
| 676 | { |
| 677 | if (png_ptr->num_palette < (1 << row_info->bit_depth) && |
| 678 | png_ptr->num_palette > 0) /* num_palette can be 0 in MNG files */ |
| 679 | { |
| 680 | /* Calculations moved outside switch in an attempt to stop different |
| 681 | * compiler warnings. 'padding' is in *bits* within the last byte, it is |
| 682 | * an 'int' because pixel_depth becomes an 'int' in the expression below, |
| 683 | * and this calculation is used because it avoids warnings that other |
| 684 | * forms produced on either GCC or MSVC. |
| 685 | */ |
| 686 | int padding = (-row_info->pixel_depth * row_info->width) & 7; |
| 687 | png_bytep rp = png_ptr->row_buf + row_info->rowbytes; |
| 688 | |
| 689 | switch (row_info->bit_depth) |
| 690 | { |
| 691 | case 1: |
| 692 | { |
| 693 | /* in this case, all bytes must be 0 so we don't need |
| 694 | * to unpack the pixels except for the rightmost one. |
| 695 | */ |
| 696 | for (; rp > png_ptr->row_buf; rp--) |
| 697 | { |
| 698 | if (*rp >> padding != 0) |
| 699 | png_ptr->num_palette_max = 1; |
| 700 | padding = 0; |
| 701 | } |
| 702 | |
| 703 | break; |
| 704 | } |
| 705 | |
| 706 | case 2: |
| 707 | { |
| 708 | for (; rp > png_ptr->row_buf; rp--) |
| 709 | { |
| 710 | int i = ((*rp >> padding) & 0x03); |
| 711 | |
| 712 | if (i > png_ptr->num_palette_max) |
| 713 | png_ptr->num_palette_max = i; |
| 714 | |
| 715 | i = (((*rp >> padding) >> 2) & 0x03); |
| 716 | |
| 717 | if (i > png_ptr->num_palette_max) |
| 718 | png_ptr->num_palette_max = i; |
| 719 | |
| 720 | i = (((*rp >> padding) >> 4) & 0x03); |
| 721 | |
| 722 | if (i > png_ptr->num_palette_max) |
| 723 | png_ptr->num_palette_max = i; |
| 724 | |
| 725 | i = (((*rp >> padding) >> 6) & 0x03); |
| 726 | |
| 727 | if (i > png_ptr->num_palette_max) |
| 728 | png_ptr->num_palette_max = i; |
| 729 | |
| 730 | padding = 0; |
| 731 | } |
| 732 | |
| 733 | break; |
| 734 | } |
| 735 | |
| 736 | case 4: |
| 737 | { |
| 738 | for (; rp > png_ptr->row_buf; rp--) |
| 739 | { |
| 740 | int i = ((*rp >> padding) & 0x0f); |
| 741 | |
| 742 | if (i > png_ptr->num_palette_max) |
| 743 | png_ptr->num_palette_max = i; |
| 744 | |
| 745 | i = (((*rp >> padding) >> 4) & 0x0f); |
| 746 | |
| 747 | if (i > png_ptr->num_palette_max) |
| 748 | png_ptr->num_palette_max = i; |
| 749 | |
| 750 | padding = 0; |
| 751 | } |
| 752 | |
| 753 | break; |
| 754 | } |
| 755 | |
| 756 | case 8: |
| 757 | { |
| 758 | for (; rp > png_ptr->row_buf; rp--) |
| 759 | { |
| 760 | if (*rp > png_ptr->num_palette_max) |
| 761 | png_ptr->num_palette_max = (int) *rp; |
| 762 | } |
| 763 | |
| 764 | break; |
| 765 | } |
| 766 | |
| 767 | default: |
| 768 | break; |
| 769 | } |
| 770 | } |
| 771 | } |
| 772 | #endif /* PNG_CHECK_FOR_INVALID_INDEX_SUPPORTED */ |
| 773 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 774 | #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \ |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 775 | defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame^] | 776 | #ifdef PNG_USER_TRANSFORM_PTR_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 777 | void PNGAPI |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame^] | 778 | png_set_user_transform_info(png_structrp png_ptr, png_voidp |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 779 | user_transform_ptr, int user_transform_depth, int user_transform_channels) |
| 780 | { |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 781 | png_debug(1, "in png_set_user_transform_info"); |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 782 | |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 783 | if (png_ptr == NULL) |
| 784 | return; |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame^] | 785 | |
| 786 | #ifdef PNG_READ_USER_TRANSFORM_SUPPORTED |
| 787 | if ((png_ptr->mode & PNG_IS_READ_STRUCT) != 0 && |
| 788 | (png_ptr->flags & PNG_FLAG_ROW_INIT) != 0) |
| 789 | { |
| 790 | png_app_error(png_ptr, |
| 791 | "info change after png_start_read_image or png_read_update_info"); |
| 792 | return; |
| 793 | } |
| 794 | #endif |
| 795 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 796 | png_ptr->user_transform_ptr = user_transform_ptr; |
| 797 | png_ptr->user_transform_depth = (png_byte)user_transform_depth; |
| 798 | png_ptr->user_transform_channels = (png_byte)user_transform_channels; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 799 | } |
| 800 | #endif |
| 801 | |
| 802 | /* This function returns a pointer to the user_transform_ptr associated with |
| 803 | * the user transform functions. The application should free any memory |
| 804 | * associated with this pointer before png_write_destroy and png_read_destroy |
| 805 | * are called. |
| 806 | */ |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame^] | 807 | #ifdef PNG_USER_TRANSFORM_PTR_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 808 | png_voidp PNGAPI |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame^] | 809 | png_get_user_transform_ptr(png_const_structrp png_ptr) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 810 | { |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 811 | if (png_ptr == NULL) |
| 812 | return (NULL); |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame^] | 813 | |
| 814 | return png_ptr->user_transform_ptr; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 815 | } |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame^] | 816 | #endif |
| 817 | |
| 818 | #ifdef PNG_USER_TRANSFORM_INFO_SUPPORTED |
| 819 | png_uint_32 PNGAPI |
| 820 | png_get_current_row_number(png_const_structrp png_ptr) |
| 821 | { |
| 822 | /* See the comments in png.h - this is the sub-image row when reading and |
| 823 | * interlaced image. |
| 824 | */ |
| 825 | if (png_ptr != NULL) |
| 826 | return png_ptr->row_number; |
| 827 | |
| 828 | return PNG_UINT_32_MAX; /* help the app not to fail silently */ |
| 829 | } |
| 830 | |
| 831 | png_byte PNGAPI |
| 832 | png_get_current_pass_number(png_const_structrp png_ptr) |
| 833 | { |
| 834 | if (png_ptr != NULL) |
| 835 | return png_ptr->pass; |
| 836 | return 8; /* invalid */ |
| 837 | } |
| 838 | #endif /* PNG_USER_TRANSFORM_INFO_SUPPORTED */ |
| 839 | #endif /* PNG_READ_USER_TRANSFORM_SUPPORTED || |
| 840 | PNG_WRITE_USER_TRANSFORM_SUPPORTED */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 841 | #endif /* PNG_READ_SUPPORTED || PNG_WRITE_SUPPORTED */ |