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-rw-r--r--preproc/test_helpers.go57
1 files changed, 57 insertions, 0 deletions
diff --git a/preproc/test_helpers.go b/preproc/test_helpers.go
new file mode 100644
index 0000000..7579e88
--- /dev/null
+++ b/preproc/test_helpers.go
@@ -0,0 +1,57 @@
+package preproc
+
+// TODO: add different pages as test cases
+// TODO: test non integral img version
+
+import (
+ "flag"
+ "image"
+ "image/draw"
+ "image/png"
+ "os"
+)
+
+var slow = flag.Bool("slow", false, "include slow tests")
+var update = flag.Bool("update", false, "update golden files")
+
+func decode(s string) (*image.Gray, error) {
+ f, err := os.Open(s)
+ defer f.Close()
+ if err != nil {
+ return nil, err
+ }
+ img, err := png.Decode(f)
+ if err != nil {
+ return nil, err
+ }
+ b := img.Bounds()
+ gray := image.NewGray(image.Rect(0, 0, b.Dx(), b.Dy()))
+ draw.Draw(gray, b, img, b.Min, draw.Src)
+ return gray, nil
+}
+
+func imgsequal(img1 *image.Gray, img2 *image.Gray) 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
+}