Matrix<Color> read_img(std::string filename)
{
std::size_t n = filename.size();
std::string extension3 = filename.substr(n-3, n);
std::string extension4 = filename.substr(n-4, n);
if(!extension3.compare("bmp"))
{
return read_bmp(filename);
}
else if(!extension3.compare("gif"))
{
return read_gif(filename);
}
else if(!extension3.compare("ico"))
{
return read_ico(filename);
}
/*else if(!extension3.compare("jpg"))
{
return read_jpeg(filename);
}*/
else if(!extension3.compare("pcx"))
{
return read_pcx(filename);
}
else if(!extension3.compare("png"))
{
return read_png(filename);
}
else if(!extension3.compare("pbm"))
{
return bw2colorimage(read_pbm(filename));
}
else if(!extension3.compare("pgm"))
{
return gray2colorimage(read_pgm(filename));
}
else if(!extension3.compare("ppm"))
{
return read_ppm(filename);
}
else if(!extension3.compare("tga"))
{
return read_tga(filename);
}
else if(!extension4.compare("tiff"))
{
return read_tiff(filename);
}
else
{
return Matrix<Color>();
}
}
int
read_image(const char *filename, int *width, int *height,
unsigned char *rgb)
{
char buf[4];
unsigned char *ubuf = (unsigned char *) buf;
int success = 0;
FILE *file;
file = fopen(filename, "rb");
if (file == NULL) return(0);
/* see what kind of file we have */
fread(buf, 1, 4, file);
fclose(file);
if (!strncmp("BM", buf, 2))
{
success = read_bmp(filename, width, height, rgb);
}
else if (!strncmp("GIF8", buf, 4))
{
#ifdef HAVE_LIBGIF
success = read_gif(filename, width, height, rgb);
#else
fprintf(stderr,
"Sorry, this program was not compiled with GIF support\n");
success = 0;
#endif /* HAVE_LIBGIF */
}
else if ((ubuf[0] == 0xff) && (ubuf[1] == 0xd8))
{
#ifdef HAVE_LIBJPEG
success = read_jpeg(filename, width, height, rgb);
#else
fprintf(stderr,
"Sorry, this program was not compiled with JPEG support\n");
success = 0;
#endif /* HAVE_LIBJPEG */
}
else if ((ubuf[0] == 0x89) && !strncmp("PNG", buf+1, 3))
{
#ifdef HAVE_LIBPNG
success = read_png(filename, width, height, rgb);
#else
fprintf(stderr,
"Sorry, this program was not compiled with PNG support\n");
success = 0;
#endif /* HAVE_LIBPNG */
}
else if (( !strncmp("P6\n", buf, 3))
|| (!strncmp("P5\n", buf, 3))
|| (!strncmp("P4\n", buf, 3))
|| (!strncmp("P3\n", buf, 3))
|| (!strncmp("P2\n", buf, 3))
|| (!strncmp("P1\n", buf, 3)))
{
#ifdef HAVE_LIBPNM
success = read_pnm(filename, width, height, rgb);
#else
fprintf(stderr,
"Sorry, this program was not compiled with PNM support\n");
success = 0;
#endif /* HAVE_LIBPNM */
}
else if (((!strncmp ("MM", buf, 2)) && (ubuf[2] == 0x00)
&& (ubuf[3] == 0x2a))
|| ((!strncmp ("II", buf, 2)) && (ubuf[2] == 0x2a)
&& (ubuf[3] == 0x00)))
{
#ifdef HAVE_LIBTIFF
success = read_tiff(filename, width, height, rgb);
#else
fprintf(stderr,
"Sorry, this program was not compiled with TIFF support\n");
success = 0;
#endif
}
else
{
fprintf(stderr, "Unknown image format\n");
success = 0;
}
return(success);
}
