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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
}
}
}
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