text: /*---------------------------------------------------------------------------
  
     pngquant:  RGBA -> RGBA-palette quantization program             rwpng.h
  
    ---------------------------------------------------------------------------
  
     © 1998-2000 by Greg Roelofs.
     © 2009-2014 by Kornel Lesiński.
  
     All rights reserved.
  
     Redistribution and use in source and binary forms, with or without modification,
     are permitted provided that the following conditions are met:
  
     1. Redistributions of source code must retain the above copyright notice,
        this list of conditions and the following disclaimer.
  
     2. Redistributions in binary form must reproduce the above copyright notice,
        this list of conditions and the following disclaimer in the documentation
        and/or other materials provided with the distribution.
  
     THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
     AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
     DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
     FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
     SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
     CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
     OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  
    ---------------------------------------------------------------------------*/
  
  #ifndef RWPNG_H
  #define RWPNG_H
  
  #include "png.h"  /* if this include fails, you need to install libpng (e.g. libpng-devel package) */
  #include <setjmp.h>
  
  #ifndef USE_COCOA
  #define USE_COCOA 0
  #endif
  
  typedef enum {
      SUCCESS = 0,
      MISSING_ARGUMENT = 1,
      READ_ERROR = 2,
      INVALID_ARGUMENT = 4,
      NOT_OVERWRITING_ERROR = 15,
      CANT_WRITE_ERROR = 16,
      OUT_OF_MEMORY_ERROR = 17,
      WRONG_ARCHITECTURE = 18, // Missing SSE
      PNG_OUT_OF_MEMORY_ERROR = 24,
      LIBPNG_FATAL_ERROR = 25,
      LIBPNG_INIT_ERROR = 35,
      TOO_LARGE_FILE = 98,
      TOO_LOW_QUALITY = 99,
  } pngquant_error;
  
  struct rwpng_chunk {
      struct rwpng_chunk *next;
      png_byte *data;
      png_size_t size;
      png_byte name[5];
      png_byte location;
  };
  
  #if USE_LCMS
  typedef enum {
    NONE = 0,
    ICCP = 1, // used ICC profile
    ICCP_WARN_GRAY = 2, // ignore and warn about GRAY ICC profile
    GAMA_CHRM = 3, // used gAMA and cHARM
  } lcms_transform;
  #endif
  
  typedef struct {
      jmp_buf jmpbuf;
      png_uint_32 width;
      png_uint_32 height;
      png_size_t file_size;
      double gamma;
      unsigned char **row_pointers;
      unsigned char *rgba_data;
      struct rwpng_chunk *chunks;
  #if USE_LCMS
      lcms_transform lcms_status;
  #endif
  } png24_image;
  
  typedef struct {
      jmp_buf jmpbuf;
      png_uint_32 width;
      png_uint_32 height;
      png_size_t maximum_file_size;
      double gamma;
      unsigned char **row_pointers;
      unsigned char *indexed_data;
      unsigned int num_palette;
      unsigned int num_trans;
      png_color palette[256];
      unsigned char trans[256];
      struct rwpng_chunk *chunks;
      char fast_compression;
  } png8_image;
  
  typedef union {
      jmp_buf jmpbuf;
      png24_image png24;
      png8_image png8;
  } rwpng_png_image;
  
  /* prototypes for public functions in rwpng.c */
  
  void rwpng_version_info(FILE *fp);
  
  pngquant_error rwpng_read_image24(FILE *infile, png24_image *mainprog_ptr, int verbose);
  pngquant_error rwpng_write_image8(FILE *outfile, const png8_image *mainprog_ptr);
  pngquant_error rwpng_write_image24(FILE *outfile, const png24_image *mainprog_ptr, int filter);
  void rwpng_free_image24(png24_image *);
  void rwpng_free_image8(png8_image *);
  
  #endif
  