mga_gif.c

linux下显示各种格式图片

/* 	(c) HelDoRe
	Gif unit ...    v0.0.5
			Supported formats :
			libungif :-)
*/			

#define VERGIF " unit v0.0.5"

#include <stdio.h>
#include <string.h>
#include "../mga_view.h"
#ifdef USE_LIBGIF
#include <gif_lib.h>
#endif

void help_gif()

{
#ifdef USE_LIBGIF
printf("GIF%s\n   + uses libungif\n",VERGIF);
#endif
}





int detect_gif()
{
#ifdef USE_LIBGIF
    int form79,dane,ero,extcode;
    short int GIsyg;
    GifRecordType rectyp;
    GifByteType *extension;
    GifFileType *gplik;
    static int InterlacedOffset[]={0,4,2,1},InterlacedJumps[]={8,8,4,2};
    unsigned char linia[4000];


	fread(&GIsyg,sizeof (short int),1,plik);
	    if (GIsyg != 18759) return 1;
	     fseek(plik,2,SEEK_CUR);
	     form79=fgetc(plik);form79-=48;
	     fseek(plik,1,SEEK_CUR);
	    image_x=fgetc16b(plik);
	    image_y=fgetc16b(plik);
	    dane=fgetc(plik);
	    depth=dane & 0x07;
	    depth++;
	    if (check_image(image_x,image_y,depth)==3) return 3;
	    gplik=DGifOpenFileName(mee);
	    printf("GIF%s\n",VERGIF);
	    printf("GIF8%ia detected : %ix%ix%i  %i colors",form79,image_x,image_y,depth,gplik->SColorMap->ColorCount);

			for (tempi=0;tempi<gplik->SColorMap->ColorCount;tempi++) {
			    tab2r[tempi]=gplik->SColorMap->Colors[tempi].Red;
			    tab2g[tempi]=gplik->SColorMap->Colors[tempi].Green;
			    tab2b[tempi]=gplik->SColorMap->Colors[tempi].Blue;

			    }

	    do {
		if (DGifGetRecordType(gplik,&rectyp) == GIF_ERROR){
		    }
		    
		    switch (rectyp) {
		    case IMAGE_DESC_RECORD_TYPE:
			if (DGifGetImageDesc(gplik) == GIF_ERROR) {
			    PrintGifError();
			}
			image_x=gplik->Image.Width;
			image_y=gplik->Image.Height;
			if (gplik->Image.Interlace) {
				printf("    interlaced");
			for (form79=depth=0;depth<4;depth++)
			    for (ero=gplik->Image.Top+InterlacedOffset[depth];ero<gplik->Image.Top+gplik->Image.Height;ero+=InterlacedJumps[depth]){
			    DGifGetLine(gplik,linia,image_x);
		           for (x=0;x<image_x;x++)
		            {
				tempi=linia[x];
				tabr[x+(ero*image_x)]=tab2r[tempi];
				tabg[x+(ero*image_x)]=tab2g[tempi];
				tabb[x+(ero*image_x)]=tab2b[tempi];
			    }
			    }


			} else {
			for (y=0;y<image_y;y++) {
			    DGifGetLine(gplik,linia,image_x);
		           for (x=0;x<image_x;x++)
		            {
				tempi=linia[x];
				tabr[x+(y*image_x)]=tab2r[tempi];
				tabg[x+(y*image_x)]=tab2g[tempi];
				tabb[x+(y*image_x)]=tab2b[tempi];
			    }
		           }
			  }
			break;    
		    case EXTENSION_RECORD_TYPE:
			if (DGifGetExtension(gplik, &extcode, &extension) == GIF_ERROR) {
			}
			while (extension != NULL) {
			    if(extcode == COMMENT_EXT_FUNC_CODE) {
				extension[extension[0]+1] = '\000';
				strcat(linia, (char*)extension+1);
				printf("\nComment         : ");
				for (x=5;x<extension[0]+6;x++){
				printf("%c",linia[x]);}
			    }
			    if (DGifGetExtensionNext(gplik, &extension) == GIF_ERROR) {
			    }
			}
			break;
		    case TERMINATE_RECORD_TYPE:
			break;
			
		    default:
			break;
		    
		    }
		    }
		    while (rectyp !=TERMINATE_RECORD_TYPE);

	    printf("\n");




	DGifCloseFile(gplik);
    return 0;	
#else
    return 1;
#endif

}