tga.h

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/*
    Copyright (C) 2000  Marco Ziech
    Copyright (C) 2000  Ross Combs ([e-mail])

    This program 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 2 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
*/
#ifndef INCLUDED_TGA_H
#define INCLUDED_TGA_H

#ifdef JUST_NEED_TYPES
# include "compat/uint.h"
#else
# define JUST_NEED_TYPES
# include "compat/uint.h"
# undef JUST_NEED_TYPES
#endif

typedef struct {
        t_uint8  idlen; /* number of bytes in Field 6: 0==no id */
        t_uint8  cmaptype; /* colormap: 0==none, 1==included, <128==TrueVision, >=128==developer */
        t_uint8  imgtype; /* pixel format: <128==TrueVision, >=128==developer */
        t_uint16 cmapfirst; /* first entry offset */
        t_uint16 cmaplen; /* number of colormap entries */
        t_uint8  cmapes; /* size of a single colormap entry in bits, 15 forces 1 attribute bit, 32 forces 8  */
        t_uint16 xorigin; /* x coordinate of lower left hand corner with origin at left of screen */
        t_uint16 yorigin; /* y coordinate of lower left hand corner with origin at bottom of screen */
        t_uint16 width; /* width in pixels */
        t_uint16 height; /* height in pixels */
        t_uint8  bpp; /* bits per pixel, including attributes and alpha channel */
        t_uint8  desc; /* image descriptor: bits 0,1,2,3==num attribute bits per pixel, bit 4==horizontal order, bit 5==vertical order, bits 6,7==interleaving */
        /* field 6, optional */
        /* field 7, colormap data in ARGB, optional, entries are (min(cmapes/3,8)*3+7)/8 bits wide */
	t_uint8 *data;
	/* field 9, developer area, optional */
	/* field 10, extension area, optional */
	t_uint32 extareaoff; /* extension area offset, 0==none */
	t_uint32 devareaoff; /* developer area offset, 0==none */
	/* magic, null terminated */
} t_tgaimg;

typedef enum {
	tgaimgtype_empty=0,
	tgaimgtype_uncompressed_mapped=1,
	tgaimgtype_uncompressed_truecolor=2,
	tgaimgtype_uncompressed_monochrome=3,
	tgaimgtype_rlecompressed_mapped=9,
	tgaimgtype_rlecompressed_truecolor=10,
	tgaimgtype_rlecompressed_monochrome=11,
	tgaimgtype_huffman_mapped=32,
	tgaimgtype_huffman_4pass_mapped=33
} t_tgaimgtype;

typedef enum {
	tgadesc_attrbits0=1,
	tgadesc_attrbits1=2,
	tgadesc_attrbits2=4,
	tgadesc_attrbits3=8,
	tgadesc_horz=16,
	tgadesc_vert=32,
	tgadesc_interleave1=64,
	tgadesc_interleave2=128
} t_tgadesc;

typedef enum {
	tgacmap_none=0,
	tgacmap_included=1
} t_tgacmap;

typedef enum {
	RLE,
	RAW
} t_tgapkttype;

/* "new" style TGA allowing for developer and extension areas must have this magic at
   the end of the file */
#define TGAMAGIC "TRUEVISION-XFILE."

#include <stdio.h>

extern t_tgaimg * new_tgaimg(unsigned int width, unsigned int height, unsigned int bpp, t_tgaimgtype imgtype);
extern int getpixelsize(t_tgaimg const *img);
extern t_tgaimg * load_tgaheader(void);
extern t_tgaimg * load_tga(FILE *f);
extern int write_tga(FILE *f, t_tgaimg *img);
extern void destroy_img(t_tgaimg * img);
extern void print_tga_info(t_tgaimg const * img, FILE * fp);

#endif