154 lines
2.4 KiB
Go
154 lines
2.4 KiB
Go
// 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 graphics
|
|
|
|
import (
|
|
"code.google.com/p/graphics-go/graphics/graphicstest"
|
|
"image"
|
|
"testing"
|
|
|
|
_ "image/png"
|
|
)
|
|
|
|
var scaleOneColorTests = []transformOneColorTest{
|
|
{
|
|
"down-half",
|
|
1, 1,
|
|
2, 2,
|
|
nil,
|
|
[]uint8{
|
|
0x80, 0x00,
|
|
0x00, 0x80,
|
|
},
|
|
[]uint8{
|
|
0x40,
|
|
},
|
|
},
|
|
{
|
|
"up-double",
|
|
4, 4,
|
|
2, 2,
|
|
nil,
|
|
[]uint8{
|
|
0x80, 0x00,
|
|
0x00, 0x80,
|
|
},
|
|
[]uint8{
|
|
0x80, 0x60, 0x20, 0x00,
|
|
0x60, 0x50, 0x30, 0x20,
|
|
0x20, 0x30, 0x50, 0x60,
|
|
0x00, 0x20, 0x60, 0x80,
|
|
},
|
|
},
|
|
{
|
|
"up-doublewidth",
|
|
4, 2,
|
|
2, 2,
|
|
nil,
|
|
[]uint8{
|
|
0x80, 0x00,
|
|
0x00, 0x80,
|
|
},
|
|
[]uint8{
|
|
0x80, 0x60, 0x20, 0x00,
|
|
0x00, 0x20, 0x60, 0x80,
|
|
},
|
|
},
|
|
{
|
|
"up-doubleheight",
|
|
2, 4,
|
|
2, 2,
|
|
nil,
|
|
[]uint8{
|
|
0x80, 0x00,
|
|
0x00, 0x80,
|
|
},
|
|
[]uint8{
|
|
0x80, 0x00,
|
|
0x60, 0x20,
|
|
0x20, 0x60,
|
|
0x00, 0x80,
|
|
},
|
|
},
|
|
{
|
|
"up-partial",
|
|
3, 3,
|
|
2, 2,
|
|
nil,
|
|
[]uint8{
|
|
0x80, 0x00,
|
|
0x00, 0x80,
|
|
},
|
|
[]uint8{
|
|
0x80, 0x40, 0x00,
|
|
0x40, 0x40, 0x40,
|
|
0x00, 0x40, 0x80,
|
|
},
|
|
},
|
|
}
|
|
|
|
func TestScaleOneColor(t *testing.T) {
|
|
for _, oc := range scaleOneColorTests {
|
|
dst := oc.newDst()
|
|
src := oc.newSrc()
|
|
if err := Scale(dst, src); err != nil {
|
|
t.Errorf("scale %s: %v", oc.desc, err)
|
|
continue
|
|
}
|
|
|
|
if !checkTransformTest(t, &oc, dst) {
|
|
continue
|
|
}
|
|
}
|
|
}
|
|
|
|
func TestScaleEmpty(t *testing.T) {
|
|
empty := image.NewRGBA(image.Rect(0, 0, 0, 0))
|
|
if err := Scale(empty, empty); err != nil {
|
|
t.Fatal(err)
|
|
}
|
|
}
|
|
|
|
func TestScaleGopher(t *testing.T) {
|
|
dst := image.NewRGBA(image.Rect(0, 0, 100, 150))
|
|
|
|
src, err := graphicstest.LoadImage("../testdata/gopher.png")
|
|
if err != nil {
|
|
t.Error(err)
|
|
return
|
|
}
|
|
|
|
// Down-sample.
|
|
if err := Scale(dst, src); err != nil {
|
|
t.Fatal(err)
|
|
}
|
|
cmp, err := graphicstest.LoadImage("../testdata/gopher-100x150.png")
|
|
if err != nil {
|
|
t.Error(err)
|
|
return
|
|
}
|
|
err = graphicstest.ImageWithinTolerance(dst, cmp, 0)
|
|
if err != nil {
|
|
t.Error(err)
|
|
return
|
|
}
|
|
|
|
// Up-sample.
|
|
dst = image.NewRGBA(image.Rect(0, 0, 500, 750))
|
|
if err := Scale(dst, src); err != nil {
|
|
t.Fatal(err)
|
|
}
|
|
cmp, err = graphicstest.LoadImage("../testdata/gopher-500x750.png")
|
|
if err != nil {
|
|
t.Error(err)
|
|
return
|
|
}
|
|
err = graphicstest.ImageWithinTolerance(dst, cmp, 0)
|
|
if err != nil {
|
|
t.Error(err)
|
|
return
|
|
}
|
|
}
|