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  1. /*
  2.  * PNG image format
  3.  * Copyright (c) 2003 Fabrice Bellard
  4.  *
  5.  * This file is part of FFmpeg.
  6.  *
  7.  * FFmpeg is free software; you can redistribute it and/or
  8.  * modify it under the terms of the GNU Lesser General Public
  9.  * License as published by the Free Software Foundation; either
  10.  * version 2.1 of the License, or (at your option) any later version.
  11.  *
  12.  * FFmpeg is distributed in the hope that it will be useful,
  13.  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15.  * Lesser General Public License for more details.
  16.  *
  17.  * You should have received a copy of the GNU Lesser General Public
  18.  * License along with FFmpeg; if not, write to the Free Software
  19.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20.  */
  21.  
  22. #ifndef AVCODEC_PNG_H
  23. #define AVCODEC_PNG_H
  24.  
  25. #include <stdint.h>
  26.  
  27. #define PNG_COLOR_MASK_PALETTE    1
  28. #define PNG_COLOR_MASK_COLOR      2
  29. #define PNG_COLOR_MASK_ALPHA      4
  30.  
  31. #define PNG_COLOR_TYPE_GRAY 0
  32. #define PNG_COLOR_TYPE_PALETTE  (PNG_COLOR_MASK_COLOR | PNG_COLOR_MASK_PALETTE)
  33. #define PNG_COLOR_TYPE_RGB        (PNG_COLOR_MASK_COLOR)
  34. #define PNG_COLOR_TYPE_RGB_ALPHA  (PNG_COLOR_MASK_COLOR | PNG_COLOR_MASK_ALPHA)
  35. #define PNG_COLOR_TYPE_GRAY_ALPHA (PNG_COLOR_MASK_ALPHA)
  36.  
  37. #define PNG_FILTER_TYPE_LOCO   64
  38. #define PNG_FILTER_VALUE_NONE  0
  39. #define PNG_FILTER_VALUE_SUB   1
  40. #define PNG_FILTER_VALUE_UP    2
  41. #define PNG_FILTER_VALUE_AVG   3
  42. #define PNG_FILTER_VALUE_PAETH 4
  43. #define PNG_FILTER_VALUE_MIXED 5
  44.  
  45. #define PNG_IHDR      0x0001
  46. #define PNG_IDAT      0x0002
  47. #define PNG_ALLIMAGE  0x0004
  48. #define PNG_PLTE      0x0008
  49.  
  50. #define NB_PASSES 7
  51.  
  52. #define PNGSIG 0x89504e470d0a1a0a
  53. #define MNGSIG 0x8a4d4e470d0a1a0a
  54.  
  55. /* Mask to determine which y pixels are valid in a pass */
  56. extern const uint8_t ff_png_pass_ymask[NB_PASSES];
  57.  
  58. void *ff_png_zalloc(void *opaque, unsigned int items, unsigned int size);
  59.  
  60. void ff_png_zfree(void *opaque, void *ptr);
  61.  
  62. int ff_png_get_nb_channels(int color_type);
  63.  
  64. /* compute the row size of an interleaved pass */
  65. int ff_png_pass_row_size(int pass, int bits_per_pixel, int width);
  66.  
  67. void ff_add_png_paeth_prediction(uint8_t *dst, uint8_t *src, uint8_t *top, int w, int bpp);
  68.  
  69. #endif /* AVCODEC_PNG_H */
  70.