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graphics: Bug fix: pixels read from GPU might include errors (#492)

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This commit is contained in:
Hajime Hoshi 2018-02-03 16:43:18 +09:00
parent 65b71ad79d
commit 595e654123
1 changed files with 24 additions and 5 deletions
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29
internal/restorable/images_test.go
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@ -47,6 +47,25 @@ func byteSliceToColor(b []byte, index int) color.RGBA {
return color.RGBA{b[i], b[i+1], b[i+2], b[i+3]}
}
func abs(x int) int {
if x < 0 {
return -x
}
return x
}
// sameColors compares c1 and c2 and returns a boolean value indicating
// if the two colors are (almost) same.
//
// Pixels read from GPU might include errors (#492), and
// sameColors considers such errors as delta.
func sameColors(c1, c2 color.RGBA, delta int) bool {
return abs(int(c1.R)-int(c2.R)) <= delta &&
abs(int(c1.G)-int(c2.G)) <= delta &&
abs(int(c1.B)-int(c2.B)) <= delta &&
abs(int(c1.A)-int(c2.A)) <= delta
}
func TestRestore(t *testing.T) {
img0 := NewImage(1, 1, graphics.FilterNearest, false)
// Clear images explicitly.
@ -65,7 +84,7 @@ func TestRestore(t *testing.T) {
}
want := clr0
got := byteSliceToColor(img0.BasePixelsForTesting(), 0)
if got != want {
if !sameColors(got, want, 1) {
t.Errorf("got %v, want %v", got, want)
}
}
@ -113,7 +132,7 @@ func TestRestoreChain(t *testing.T) {
want := clr
for i, img := range imgs {
got := byteSliceToColor(img.BasePixelsForTesting(), 0)
if got != want {
if !sameColors(got, want, 1) {
t.Errorf("%d: got %v, want %v", i, got, want)
}
}
@ -174,7 +193,7 @@ func TestRestoreOverrideSource(t *testing.T) {
},
}
for _, c := range testCases {
if c.got != c.want {
if !sameColors(c.got, c.want, 1) {
t.Errorf("%s: got %v, want %v", c.name, c.got, c.want)
}
}
@ -286,7 +305,7 @@ func TestRestoreComplexGraph(t *testing.T) {
want = color.RGBA{0xff, 0xff, 0xff, 0xff}
}
got := byteSliceToColor(c.image.BasePixelsForTesting(), i)
if got != want {
if !sameColors(got, want, 1) {
t.Errorf("%s[%d]: got %v, want %v", c.name, i, got, want)
}
}
@ -337,7 +356,7 @@ func TestRestoreRecursive(t *testing.T) {
want = color.RGBA{0xff, 0xff, 0xff, 0xff}
}
got := byteSliceToColor(c.image.BasePixelsForTesting(), i)
if got != want {
if !sameColors(got, want, 1) {
t.Errorf("%s[%d]: got %v, want %v", c.name, i, got, want)
}
}