diff options
Diffstat (limited to 'vendor/github.com/disintegration/imaging/histogram_test.go')
-rw-r--r-- | vendor/github.com/disintegration/imaging/histogram_test.go | 42 |
1 files changed, 42 insertions, 0 deletions
diff --git a/vendor/github.com/disintegration/imaging/histogram_test.go b/vendor/github.com/disintegration/imaging/histogram_test.go new file mode 100644 index 000000000..0bcf82588 --- /dev/null +++ b/vendor/github.com/disintegration/imaging/histogram_test.go @@ -0,0 +1,42 @@ +package imaging + +import ( + "image" + "image/color" + "testing" +) + +func TestHistogram(t *testing.T) { + b := image.Rectangle{image.Point{0, 0}, image.Point{2, 2}} + + i1 := image.NewRGBA(b) + i1.Set(0, 0, image.Black) + i1.Set(1, 0, image.White) + i1.Set(1, 1, image.White) + i1.Set(0, 1, color.Gray{123}) + + h := Histogram(i1) + if h[0] != 0.25 || h[123] != 0.25 || h[255] != 0.5 { + t.Errorf("Incorrect histogram for image i1") + } + + i2 := image.NewRGBA(b) + i2.Set(0, 0, color.Gray{51}) + i2.Set(0, 1, color.Gray{14}) + i2.Set(1, 0, color.Gray{14}) + + h = Histogram(i2) + if h[14] != 0.5 || h[51] != 0.25 || h[0] != 0.25 { + t.Errorf("Incorrect histogram for image i2") + } + + b = image.Rectangle{image.Point{0, 0}, image.Point{0, 0}} + i3 := image.NewRGBA(b) + h = Histogram(i3) + for _, val := range h { + if val != 0 { + t.Errorf("Histogram for an empty image should be a zero histogram.") + return + } + } +} |