pm, ok := m.(*image.Paletted)
if !ok || len(pm.Palette) > opts.NumColors {
+ // Set pm to be a palettedized copy of m, including its bounds, which
+ // might not start at (0, 0).
+ //
// TODO: Pick a better sub-sample of the Plan 9 palette.
pm = image.NewPaletted(b, palette.Plan9[:opts.NumColors])
if opts.Quantizer != nil {
pm.Palette = opts.Quantizer.Quantize(make(color.Palette, 0, opts.NumColors), m)
}
- opts.Drawer.Draw(pm, b, m, image.ZP)
+ opts.Drawer.Draw(pm, b, m, b.Min)
}
// When calling Encode instead of EncodeAll, the single-frame image is
{+2, +2},
}
for _, p := range points {
- src := image.NewPaletted(image.Rectangle{Min: p, Max: p.Add(image.Point{6, 6})}, palette.Plan9)
+ src := image.NewPaletted(image.Rectangle{
+ Min: p,
+ Max: p.Add(image.Point{6, 6}),
+ }, palette.Plan9)
var buf bytes.Buffer
if err := Encode(&buf, src, nil); err != nil {
t.Errorf("p=%v: Encode: %v", p, err)
t.Errorf("p=%v: got %v, want %v", p, got, want)
}
}
+
+ // Also test having a source image (gray on the diagonal) that has a
+ // non-zero Bounds().Min, but isn't an image.Paletted.
+ {
+ p := image.Point{+2, +2}
+ src := image.NewRGBA(image.Rectangle{
+ Min: p,
+ Max: p.Add(image.Point{6, 6}),
+ })
+ src.SetRGBA(2, 2, color.RGBA{0x22, 0x22, 0x22, 0xFF})
+ src.SetRGBA(3, 3, color.RGBA{0x33, 0x33, 0x33, 0xFF})
+ src.SetRGBA(4, 4, color.RGBA{0x44, 0x44, 0x44, 0xFF})
+ src.SetRGBA(5, 5, color.RGBA{0x55, 0x55, 0x55, 0xFF})
+ src.SetRGBA(6, 6, color.RGBA{0x66, 0x66, 0x66, 0xFF})
+ src.SetRGBA(7, 7, color.RGBA{0x77, 0x77, 0x77, 0xFF})
+
+ var buf bytes.Buffer
+ if err := Encode(&buf, src, nil); err != nil {
+ t.Errorf("gray-diagonal: Encode: %v", err)
+ return
+ }
+ m, err := Decode(&buf)
+ if err != nil {
+ t.Errorf("gray-diagonal: Decode: %v", err)
+ return
+ }
+ if got, want := m.Bounds(), image.Rect(0, 0, 6, 6); got != want {
+ t.Errorf("gray-diagonal: got %v, want %v", got, want)
+ return
+ }
+
+ rednessAt := func(x int, y int) uint32 {
+ r, _, _, _ := m.At(x, y).RGBA()
+ // Shift by 8 to convert from 16 bit color to 8 bit color.
+ return r >> 8
+ }
+
+ // Round-tripping a still (non-animated) image.Image through
+ // Encode+Decode should shift the origin to (0, 0).
+ if got, want := rednessAt(0, 0), uint32(0x22); got != want {
+ t.Errorf("gray-diagonal: rednessAt(0, 0): got 0x%02x, want 0x%02x", got, want)
+ }
+ if got, want := rednessAt(5, 5), uint32(0x77); got != want {
+ t.Errorf("gray-diagonal: rednessAt(5, 5): got 0x%02x, want 0x%02x", got, want)
+ }
+ }
}
func TestEncodeImplicitConfigSize(t *testing.T) {