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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/types.h>
#include <assert.h>
#include <gif_lib.h>
#include "meh.h"
struct gif_t{
struct image img;
FILE *f;
GifFileType *gif;
};
static int isgif(FILE *f){
return (getc(f) == 'G' && getc(f) == 'I' && getc(f) == 'F');
}
static struct image *gif_open(FILE *f){
struct gif_t *g;
GifFileType *gif;
rewind(f);
if(!isgif(f))
return NULL;
/* HACK HACK HACK */
rewind(f);
lseek(fileno(f), 0L, SEEK_SET);
if(!(gif = DGifOpenFileHandle(fileno(f)))){
/* HACK AND HOPE */
rewind(f);
lseek(fileno(f), 0L, SEEK_SET);
return NULL;
}
g = malloc(sizeof(struct gif_t));
g->f = f;
g->gif = gif;
g->img.bufwidth = gif->SWidth;
g->img.bufheight = gif->SHeight;
return (struct image *)g;
}
static int gif_read(struct image *img){
unsigned int i, j = 0;
struct gif_t *g = (struct gif_t *)img;
GifColorType *colormap;
SavedImage *s;
if(DGifSlurp(g->gif) == GIF_ERROR){
PrintGifError();
return 1;
}
s = &g->gif->SavedImages[0];
if(s->ImageDesc.ColorMap)
colormap = s->ImageDesc.ColorMap->Colors;
else if(g->gif->SColorMap)
colormap = g->gif->SColorMap->Colors;
else{
PrintGifError();
return 1;
}
for(i = 0; i < img->bufwidth * img->bufheight; i++){
unsigned char idx = s->RasterBits[i];
img->buf[j++] = colormap[idx].Red;
img->buf[j++] = colormap[idx].Green;
img->buf[j++] = colormap[idx].Blue;
}
return 0;
}
void gif_close(struct image *img){
struct gif_t *g = (struct gif_t *)img;
DGifCloseFile(g->gif);
fclose(g->f);
}
struct imageformat giflib = {
gif_open,
gif_read,
gif_close
};
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