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/* See the file COPYING for conditions of use */
/* get png type definitions */
#include "png.h"
#include <stdbool.h>
#define GIFterminator ';'
#define GIFextension '!'
#define GIFimage ','
#define GIFcomment 0xfe
#define GIFapplication 0xff
#define GIFplaintext 0x01
#define GIFgraphicctl 0xf9
#define MAXCMSIZE 256
typedef unsigned char byte;
typedef png_color GifColor;
struct GIFimagestruct {
GifColor colors[MAXCMSIZE];
unsigned long color_count[MAXCMSIZE];
int offset_x;
int offset_y;
png_uint_32 width;
png_uint_32 height;
int trans;
bool interlace;
};
struct GIFelement {
struct GIFelement *next;
char GIFtype;
byte *data;
size_t allocated_size;
size_t size;
/* only used if GIFtype==GIFimage */
struct GIFimagestruct *imagestruct;
};
extern struct gif_scr{
unsigned int Width;
unsigned int Height;
GifColor ColorMap[MAXCMSIZE];
bool ColorMap_present;
unsigned int BitPixel;
unsigned int ColorResolution;
int Background;
unsigned int AspectRatio;
} GifScreen;
int ReadGIF(FILE *);
int MatteGIF(GifColor);
void allocate_element(void);
void store_block(char *, size_t);
void allocate_image(void);
void set_size(size_t);
void *xalloc(size_t);
void *xrealloc(void *, size_t);
void fix_current(void);
void free_mem(void);
int interlace_line(int height, int line);
int inv_interlace_line(int height, int line);
extern struct GIFelement first;
extern struct GIFelement *current;
extern bool recover;
extern const char version[];
extern const char compile_info[];
extern int skip_pte;
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