int R2Image::
Read(const char *filename)
{
// Initialize everything
if (pixels) { delete [] pixels; pixels = NULL; }
width = height = 0;
// Parse input filename extension
const char *input_extension;
if (!(input_extension = strrchr(filename, '.'))) {
fprintf(stderr, "Input file has no extension (e.g., .jpg).\n");
return 0;
}
// Read file of appropriate type
if (!strncmp(input_extension, ".bmp", 4)) return ReadBMP(filename);
else if (!strncmp(input_extension, ".ppm", 4)) return ReadPPM(filename);
else if (!strncmp(input_extension, ".pfm", 4)) return ReadPFM(filename);
else if (!strncmp(input_extension, ".jpg", 4)) return ReadJPEG(filename);
else if (!strncmp(input_extension, ".jpeg", 5)) return ReadJPEG(filename);
else if (!strncmp(input_extension, ".tif", 4)) return ReadTIFF(filename);
else if (!strncmp(input_extension, ".tiff", 5)) return ReadTIFF(filename);
else if (!strncmp(input_extension, ".raw", 4)) return ReadRAW(filename);
else if (!strncmp(input_extension, ".grd", 4)) return ReadGRD(filename);
// Should never get here
fprintf(stderr, "Unrecognized image file extension");
return 0;
}
static int ReadPicture(const char* const filename, WebPPicture* const pic,
int keep_alpha, Metadata* const metadata) {
int ok = 0;
FILE* in_file = fopen(filename, "rb");
if (in_file == NULL) {
fprintf(stderr, "Error! Cannot open input file '%s'\n", filename);
return ok;
}
if (pic->width == 0 || pic->height == 0) {
// If no size specified, try to decode it as PNG/JPEG (as appropriate).
const InputFileFormat format = GetImageType(in_file);
if (format == PNG_) {
ok = ReadPNG(in_file, pic, keep_alpha, metadata);
} else if (format == JPEG_) {
ok = ReadJPEG(in_file, pic, metadata);
} else if (format == TIFF_) {
ok = ReadTIFF(filename, pic, keep_alpha, metadata);
} else if (format == WEBP_) {
ok = ReadWebP(filename, pic, keep_alpha, metadata);
}
} else {
// If image size is specified, infer it as YUV format.
ok = ReadYUV(in_file, pic);
}
if (!ok) {
fprintf(stderr, "Error! Could not process file %s\n", filename);
}
fclose(in_file);
return ok;
}
