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// Copyright 2011 The Graphics-Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package convolve
import (
"code.google.com/p/graphics-go/graphics/graphicstest"
"image"
"reflect"
"testing"
_ "image/png"
)
func TestSeparableWeights(t *testing.T) {
sobelXFull := []float64{
-1, 0, 1,
-2, 0, 2,
-1, 0, 1,
}
sobelXSep := &SeparableKernel{
X: []float64{-1, 0, +1},
Y: []float64{1, 2, 1},
}
w := sobelXSep.Weights()
if !reflect.DeepEqual(w, sobelXFull) {
t.Errorf("got %v want %v", w, sobelXFull)
}
}
func TestConvolve(t *testing.T) {
kernFull, err := NewKernel([]float64{
0, 0, 0,
1, 1, 1,
0, 0, 0,
})
if err != nil {
t.Fatal(err)
}
kernSep := &SeparableKernel{
X: []float64{1, 1, 1},
Y: []float64{0, 1, 0},
}
src, err := graphicstest.LoadImage("../../testdata/gopher.png")
if err != nil {
t.Fatal(err)
}
b := src.Bounds()
sep := image.NewRGBA(b)
if err = Convolve(sep, src, kernSep); err != nil {
t.Fatal(err)
}
full := image.NewRGBA(b)
Convolve(full, src, kernFull)
err = graphicstest.ImageWithinTolerance(sep, full, 0x101)
if err != nil {
t.Fatal(err)
}
}
func TestConvolveNil(t *testing.T) {
if err := Convolve(nil, nil, nil); err != nil {
t.Fatal(err)
}
}
func TestConvolveEmpty(t *testing.T) {
empty := image.NewRGBA(image.Rect(0, 0, 0, 0))
if err := Convolve(empty, empty, nil); err != nil {
t.Fatal(err)
}
}
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