// DecodeIntoRGB reads a JPEG data stream from r and returns decoded image as an rgb.Image with RGB colors.
func DecodeIntoRGB(r io.Reader, options *DecoderOptions) (dest *rgb.Image, 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 = rgb.NewImage(image.Rect(0, 0, int(dinfo.output_width), int(dinfo.output_height)))
dinfo.out_color_space = C.JCS_RGB
readScanLines(dinfo, dest.Pix, dest.Stride)
return
}
// TODO: supports decoding into image.RGBA instead of rgb.Image.
func decodeRGB(dinfo *C.struct_jpeg_decompress_struct) (dest *rgb.Image, err error) {
C.jpeg_calc_output_dimensions(dinfo)
dest = rgb.NewImage(image.Rect(0, 0, int(dinfo.output_width), int(dinfo.output_height)))
dinfo.out_color_space = C.JCS_RGB
readScanLines(dinfo, dest.Pix, dest.Stride)
return
}
func TestImageInterface(t *testing.T) {
rect := image.Rect(0, 0, 100, 100)
img := rgb.NewImage(rect)
if got := img.ColorModel(); got != rgb.ColorModel {
t.Errorf("ColorModel() should return rgb.ColorModel, got: %v", got)
}
if got := img.Bounds(); got != rect {
t.Errorf("Bounds() should return %v, got: %v", rect, got)
}
black := color.RGBA{0x00, 0x00, 0x00, 0xFF}
if got := img.At(0, 0); got != black {
t.Errorf("At(0, 0) should return %v, got: %v", black, got)
}
blank := color.RGBA{}
if got := img.At(-1, -1); got != blank {
t.Errorf("At(0, 0) should return %v, got: %v", blank, got)
}
}