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/*    png.h
      Copyright (C) 2004-2008 Mark Tyler and Dmitry Groshev

      This file is part of mtPaint.

      mtPaint is free software; you can redistribute it and/or modify
      it under the terms of the GNU General Public License as published by
      the Free Software Foundation; either version 3 of the License, or
      (at your option) any later version.

      mtPaint is distributed in the hope that it will be useful,
      but WITHOUT ANY WARRANTY; without even the implied warranty of
      GNU General Public License for more details.

      You should have received a copy of the GNU General Public License
      along with mtPaint in the file COPYING.

//    Loading/Saving errors

#define WRONG_FORMAT -10
#define TOO_BIG -11

#define FILE_LIB_ERROR 123456
#define FILE_MEM_ERROR 123457
#define FILE_GIF_ANIM 123458

#ifdef WIN32
      #define DIR_SEP '\\'
      #define DIR_SEP '/'

/* File types */
#define FT_NONE     0
#define FT_PNG      1
#define FT_JPEG     2
#define FT_JP2      3
#define FT_J2K      4
#define FT_TIFF     5
#define FT_GIF      6
#define FT_BMP      7
#define FT_XPM      8
#define FT_XBM      9
#define FT_LSS      10
#define FT_TGA      11
#define FT_PCX      12
#define FT_GPL      13
#define FT_TXT      14
#define FT_PAL      15
#define FT_LAYERS1  16
#define FT_LAYERS2  17
#define FT_PIXMAP   18
#define NUM_FTYPES  19

#define FTM_FTYPE   0x00FF /* File type mask */
#define FTM_EXTEND  0x0100 /* Allow extended format */

/* Features supported by file formats */
#define FF_BW      0x00001 /* Black and white */
#define FF_16      0x00002 /* 16 colors */
#define FF_256     0x00004 /* 256 colors */
#define FF_IDX     0x00007 /* Indexed image */
#define FF_RGB     0x00008 /* Truecolor */
#define FF_IMAGE   0x0000F /* Image of any kind */
#define FF_ANIM    0x00010 /* Animation */
#define FF_ALPHAI  0x00020 /* Alpha channel for indexed images */
#define FF_ALPHAR  0x00040 /* Alpha channel for RGB images */
#define FF_ALPHA   0x00060 /* Alpha channel for all images */
#define FF_MULTI   0x00080 /* Multiple channels */
#define FF_TRANS   0x00100 /* Indexed transparency */
#define FF_COMP    0x00E00 /* Configurable compression */
#define FF_COMPJ   0x00200 /* JPEG compression */
#define FF_COMPZ   0x00400 /* zlib compression */
#define FF_COMPR   0x00600 /* RLE compression */
#define FF_COMPJ2  0x00800 /* JPEG2000 compression */
#define FF_SPOT    0x01000 /* "Hot spot" */
#define FF_LAYER   0x02000 /* Layered images */
#define FF_PALETTE 0x04000 /* Palette file (not image) */
#define FF_RMEM    0x08000 /* Can be read from memory */
#define FF_WMEM    0x10000 /* Can be written to memory */
#define FF_MEM     0x18000 /* Both of the above */
#define FF_NOSAVE  0x20000 /* Can be read but not written */

#define FF_SAVE_MASK (mem_img_bpp == 3 ? FF_RGB : mem_cols > 16 ? FF_256 : \
      mem_cols > 2 ? FF_16 | FF_256 : FF_IDX)

#define LONGEST_EXT 5

typedef struct {
      char *name, *ext, *ext2;
      guint32 flags;
} fformat;

fformat file_formats[NUM_FTYPES];

/* All-in-one transport container for save/load */
typedef struct {
      /* Configuration data */
      int mode, ftype;
      int xpm_trans;
      int hot_x, hot_y;
      int jpeg_quality;
      int png_compression;
      int tga_RLE;
      int jp2_rate;
      int gif_delay;
      int rgb_trans;
      int silent;
      /* Image data */
      chanlist img;
      png_color *pal;
      int width, height, bpp, colors;
} ls_settings;

extern char preserved_gif_filename[];
int preserved_gif_delay, silence_limit, jpeg_quality, png_compression;
int tga_RLE, tga_565, tga_defdir, jp2_rate, undo_load;

int file_type_by_ext(char *name, guint32 mask);

int save_image(char *file_name, ls_settings *settings);
int save_mem_image(unsigned char **buf, int *len, ls_settings *settings);

int load_image(char *file_name, int mode, int ftype);
int load_mem_image(unsigned char *buf, int len, int mode, int ftype);

int export_undo(char *file_name, ls_settings *settings);
int export_ascii ( char *file_name );

int detect_image_format(char *name);

int valid_file(char *filename);           // Can this file be opened for reading?

int show_html(char *browser, char *docs);

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