// DecodeIntoRGBA reads a JPEG data stream from r and returns decoded image as an image.RGBA with RGBA colors.
// This function only works with libjpeg-trubo, not libjpeg.
func DecodeIntoRGBA(r io.Reader, options *DecoderOptions) (dest *image.RGBA, err error) {
// Recover panic
defer func() {
if r := recover(); r != nil {
log.Println(r)
if _, ok := r.(error); !ok {
err = fmt.Errorf("JPEG error: %v", r)
}
}
}()
dinfo := C.new_decompress()
defer C.destroy_decompress(dinfo)
srcManager := makeSourceManager(r, dinfo)
defer releaseSourceManager(srcManager)
C.jpeg_read_header(dinfo, C.TRUE)
setupDecoderOptions(dinfo, options)
C.jpeg_calc_output_dimensions(dinfo)
dest = image.NewRGBA(image.Rect(0, 0, int(dinfo.output_width), int(dinfo.output_height)))
colorSpace := C.getJCS_EXT_RGBA()
if colorSpace == C.JCS_UNKNOWN {
return nil, errors.New("JCS_EXT_RGBA is not supported (probably built without libjpeg-trubo)")
}
dinfo.out_color_space = colorSpace
readScanLines(dinfo, dest.Pix, dest.Stride)
return
}
// SupportRGBA returns whether RGBA decoding is supported.
func SupportRGBA() bool {
if C.getJCS_EXT_RGBA() == C.JCS_UNKNOWN {
return false
}
return true
}