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jeremybenn |
// Copyright 2011 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package image_test
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import (
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. "image"
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"image/color"
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"testing"
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)
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type image interface {
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Image
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Opaque() bool
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Set(int, int, color.Color)
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SubImage(Rectangle) Image
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}
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func cmp(t *testing.T, cm color.Model, c0, c1 color.Color) bool {
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r0, g0, b0, a0 := cm.Convert(c0).RGBA()
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r1, g1, b1, a1 := cm.Convert(c1).RGBA()
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return r0 == r1 && g0 == g1 && b0 == b1 && a0 == a1
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}
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func TestImage(t *testing.T) {
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testImage := []image{
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NewRGBA(Rect(0, 0, 10, 10)),
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NewRGBA64(Rect(0, 0, 10, 10)),
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NewNRGBA(Rect(0, 0, 10, 10)),
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NewNRGBA64(Rect(0, 0, 10, 10)),
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NewAlpha(Rect(0, 0, 10, 10)),
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NewAlpha16(Rect(0, 0, 10, 10)),
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NewGray(Rect(0, 0, 10, 10)),
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NewGray16(Rect(0, 0, 10, 10)),
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NewPaletted(Rect(0, 0, 10, 10), color.Palette{
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Transparent,
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Opaque,
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}),
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}
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for _, m := range testImage {
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if !Rect(0, 0, 10, 10).Eq(m.Bounds()) {
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t.Errorf("%T: want bounds %v, got %v", m, Rect(0, 0, 10, 10), m.Bounds())
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continue
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}
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if !cmp(t, m.ColorModel(), Transparent, m.At(6, 3)) {
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t.Errorf("%T: at (6, 3), want a zero color, got %v", m, m.At(6, 3))
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continue
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}
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m.Set(6, 3, Opaque)
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if !cmp(t, m.ColorModel(), Opaque, m.At(6, 3)) {
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t.Errorf("%T: at (6, 3), want a non-zero color, got %v", m, m.At(6, 3))
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continue
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}
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if !m.SubImage(Rect(6, 3, 7, 4)).(image).Opaque() {
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t.Errorf("%T: at (6, 3) was not opaque", m)
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continue
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}
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m = m.SubImage(Rect(3, 2, 9, 8)).(image)
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if !Rect(3, 2, 9, 8).Eq(m.Bounds()) {
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t.Errorf("%T: sub-image want bounds %v, got %v", m, Rect(3, 2, 9, 8), m.Bounds())
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continue
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}
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if !cmp(t, m.ColorModel(), Opaque, m.At(6, 3)) {
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t.Errorf("%T: sub-image at (6, 3), want a non-zero color, got %v", m, m.At(6, 3))
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continue
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}
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if !cmp(t, m.ColorModel(), Transparent, m.At(3, 3)) {
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t.Errorf("%T: sub-image at (3, 3), want a zero color, got %v", m, m.At(3, 3))
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continue
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}
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m.Set(3, 3, Opaque)
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if !cmp(t, m.ColorModel(), Opaque, m.At(3, 3)) {
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t.Errorf("%T: sub-image at (3, 3), want a non-zero color, got %v", m, m.At(3, 3))
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continue
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}
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// Test that taking an empty sub-image starting at a corner does not panic.
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m.SubImage(Rect(0, 0, 0, 0))
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m.SubImage(Rect(10, 0, 10, 0))
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m.SubImage(Rect(0, 10, 0, 10))
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m.SubImage(Rect(10, 10, 10, 10))
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}
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}
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func Test16BitsPerColorChannel(t *testing.T) {
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testColorModel := []color.Model{
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color.RGBA64Model,
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color.NRGBA64Model,
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color.Alpha16Model,
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color.Gray16Model,
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}
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for _, cm := range testColorModel {
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c := cm.Convert(color.RGBA64{0x1234, 0x1234, 0x1234, 0x1234}) // Premultiplied alpha.
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r, _, _, _ := c.RGBA()
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if r != 0x1234 {
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t.Errorf("%T: want red value 0x%04x got 0x%04x", c, 0x1234, r)
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continue
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}
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}
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testImage := []image{
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NewRGBA64(Rect(0, 0, 10, 10)),
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NewNRGBA64(Rect(0, 0, 10, 10)),
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NewAlpha16(Rect(0, 0, 10, 10)),
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NewGray16(Rect(0, 0, 10, 10)),
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}
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for _, m := range testImage {
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m.Set(1, 2, color.NRGBA64{0xffff, 0xffff, 0xffff, 0x1357}) // Non-premultiplied alpha.
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r, _, _, _ := m.At(1, 2).RGBA()
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if r != 0x1357 {
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t.Errorf("%T: want red value 0x%04x got 0x%04x", m, 0x1357, r)
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continue
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}
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}
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}
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