105 lines
2.7 KiB
Go
105 lines
2.7 KiB
Go
// Copyright 2012 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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func TestYCbCr(t *testing.T) {
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rects := []Rectangle{
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Rect(0, 0, 16, 16),
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Rect(1, 0, 16, 16),
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Rect(0, 1, 16, 16),
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Rect(1, 1, 16, 16),
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Rect(1, 1, 15, 16),
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Rect(1, 1, 16, 15),
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Rect(1, 1, 15, 15),
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Rect(2, 3, 14, 15),
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Rect(7, 0, 7, 16),
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Rect(0, 8, 16, 8),
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Rect(0, 0, 10, 11),
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Rect(5, 6, 16, 16),
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Rect(7, 7, 8, 8),
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Rect(7, 8, 8, 9),
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Rect(8, 7, 9, 8),
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Rect(8, 8, 9, 9),
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Rect(7, 7, 17, 17),
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Rect(8, 8, 17, 17),
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Rect(9, 9, 17, 17),
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Rect(10, 10, 17, 17),
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}
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subsampleRatios := []YCbCrSubsampleRatio{
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YCbCrSubsampleRatio444,
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YCbCrSubsampleRatio422,
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YCbCrSubsampleRatio420,
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}
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deltas := []Point{
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Pt(0, 0),
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Pt(1000, 1001),
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Pt(5001, -400),
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Pt(-701, -801),
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}
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for _, r := range rects {
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for _, subsampleRatio := range subsampleRatios {
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for _, delta := range deltas {
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testYCbCr(t, r, subsampleRatio, delta)
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}
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}
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}
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}
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func testYCbCr(t *testing.T, r Rectangle, subsampleRatio YCbCrSubsampleRatio, delta Point) {
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// Create a YCbCr image m, whose bounds are r translated by (delta.X, delta.Y).
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r1 := r.Add(delta)
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m := NewYCbCr(r1, subsampleRatio)
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// Test that the image buffer is reasonably small even if (delta.X, delta.Y) is far from the origin.
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if len(m.Y) > 100*100 {
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t.Errorf("r=%v, subsampleRatio=%v, delta=%v: image buffer is too large",
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r, subsampleRatio, delta)
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return
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}
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// Initialize m's pixels. For 422 and 420 subsampling, some of the Cb and Cr elements
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// will be set multiple times. That's OK. We just want to avoid a uniform image.
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for y := r1.Min.Y; y < r1.Max.Y; y++ {
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for x := r1.Min.X; x < r1.Max.X; x++ {
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yi := m.YOffset(x, y)
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ci := m.COffset(x, y)
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m.Y[yi] = uint8(16*y + x)
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m.Cb[ci] = uint8(y + 16*x)
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m.Cr[ci] = uint8(y + 16*x)
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}
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}
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// Make various sub-images of m.
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for y0 := delta.Y + 3; y0 < delta.Y+7; y0++ {
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for y1 := delta.Y + 8; y1 < delta.Y+13; y1++ {
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for x0 := delta.X + 3; x0 < delta.X+7; x0++ {
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for x1 := delta.X + 8; x1 < delta.X+13; x1++ {
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subRect := Rect(x0, y0, x1, y1)
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sub := m.SubImage(subRect).(*YCbCr)
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// For each point in the sub-image's bounds, check that m.At(x, y) equals sub.At(x, y).
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for y := sub.Rect.Min.Y; y < sub.Rect.Max.Y; y++ {
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for x := sub.Rect.Min.X; x < sub.Rect.Max.X; x++ {
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color0 := m.At(x, y).(color.YCbCr)
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color1 := sub.At(x, y).(color.YCbCr)
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if color0 != color1 {
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t.Errorf("r=%v, subsampleRatio=%v, delta=%v, x=%d, y=%d, color0=%v, color1=%v",
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r, subsampleRatio, delta, x, y, color0, color1)
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return
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}
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}
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}
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}
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}
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}
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}
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}
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