Programming

int
write_jpeg(FILE *outfile, int width, int height, unsigned char *rgb,
           int quality)
{
    struct jpeg_compress_struct cinfo;
    struct jpeg_error_mgr jerr;
    JSAMPROW scanline[1];
    cinfo.err = jpeg_std_error(&jerr);
    jpeg_create_compress(&cinfo);
    jpeg_stdio_dest(&cinfo, outfile);
    cinfo.image_width = width;
    cinfo.image_height = height;
    cinfo.input_components = 3;
    cinfo.in_color_space = JCS_RGB;
    jpeg_set_defaults(&cinfo);
    jpeg_set_quality(&cinfo, quality, TRUE);
    jpeg_start_compress(&cinfo, TRUE);
    while (cinfo.next_scanline < (unsigned int) height)
    {
        scanline[0] = rgb + 3 * width * cinfo.next_scanline;
        jpeg_write_scanlines(&cinfo, scanline, 1);
    }
    jpeg_finish_compress(&cinfo);
    jpeg_destroy_compress(&cinfo);
    return(1);
}

save_ximage_pnm(XImage *img,char *pnmname,int type) {
	int x,y;
	unsigned long pixel;
	FAIL_ON(!img || !pnmname || type<=0, "bad argument(s)"); 

	fprintf(stdout,"P%d\n%d %d\n255\n",type,img->width, img->height);
	for (y=0; y<img->height; y++) {
		for (x=0; x<img->width; x++) {
			pixel=XGetPixel(img,x,y);
			if (type==ASCII_PPM) {
				fprintf(stdout,"%ld %ld %ld\n",
						pixel>>16,(pixel&0x00ff00)>>8,pixel&0x0000ff);
			} else if (type==BINARY_PPM) {
				fprintf(stdout,"%c%c%c",
					(char)(pixel>>16),
					(char)((pixel&0x00ff00)>>8),
					(char)(pixel&0x0000ff) );

			} else {
				fprintf(stderr,"PnM type %d not supported!",type);
				return(0);
			}
		}
	}
	return(1);
}