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Diffstat (limited to 'integralimg_test.go')
-rw-r--r--integralimg_test.go60
1 files changed, 60 insertions, 0 deletions
diff --git a/integralimg_test.go b/integralimg_test.go
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index 0000000..3bc8dd6
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+++ b/integralimg_test.go
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+// Copyright 2020 Nick White.
+// Use of this source code is governed by the GPLv3
+// license that can be found in the LICENSE file.
+
+package integralimg
+
+import (
+ "image"
+ "image/draw"
+ _ "image/png"
+ "os"
+ "testing"
+)
+
+func TestFromPNG(t *testing.T) {
+ f, err := os.Open("testdata/in.png")
+ if err != nil {
+ t.Fatalf("Could not open file %s: %v\n", "testdata/in.png", err)
+ }
+ defer f.Close()
+ img, _, err := image.Decode(f)
+ if err != nil {
+ t.Fatalf("Could not decode image: %v\n", err)
+ }
+ b := img.Bounds()
+ gray := image.NewGray(image.Rect(0, 0, b.Dx(), b.Dy()))
+ draw.Draw(gray, b, img, b.Min, draw.Src)
+
+ integral := ToIntegralImg(gray)
+
+ if !imgsequal(img, integral) {
+ t.Errorf("Read png image differs to integral\n")
+ }
+}
+
+func imgsequal(img1, img2 image.Image) bool {
+ b := img1.Bounds()
+ if !b.Eq(img2.Bounds()) {
+ return false
+ }
+ for y := b.Min.Y; y < b.Max.Y; y++ {
+ for x := b.Min.X; x < b.Max.X; x++ {
+ r0, g0, b0, a0 := img1.At(x, y).RGBA()
+ r1, g1, b1, a1 := img2.At(x, y).RGBA()
+ if r0 != r1 {
+ return false
+ }
+ if g0 != g1 {
+ return false
+ }
+ if b0 != b1 {
+ return false
+ }
+ if a0 != a1 {
+ return false
+ }
+ }
+ }
+ return true
+}