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rotate_test.go
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package transform
import (
"image"
"testing"
"github.com/anthonynsimon/bild/util"
)
func TestRotate(t *testing.T) {
cases := []struct {
description string
angle float64
options *RotationOptions
value image.Image
expected *image.RGBA
}{
{
description: "angle 0.0 at center",
angle: 0.0,
options: &RotationOptions{ResizeBounds: false},
value: &image.RGBA{
Rect: image.Rect(0, 0, 2, 2),
Stride: 8,
Pix: []uint8{
0x80, 0x80, 0x80, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0x80, 0x80, 0x80, 0x80,
},
},
expected: &image.RGBA{
Rect: image.Rect(0, 0, 2, 2),
Stride: 8,
Pix: []uint8{
0x80, 0x80, 0x80, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0x80, 0x80, 0x80, 0x80,
},
},
},
{
description: "angle 90.0 at center",
angle: 90.0,
options: &RotationOptions{ResizeBounds: false},
value: &image.RGBA{
Rect: image.Rect(0, 0, 2, 2),
Stride: 8,
Pix: []uint8{
0x80, 0x80, 0x80, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0x80, 0x80, 0x80, 0xFF,
},
},
expected: &image.RGBA{
Rect: image.Rect(0, 0, 2, 2),
Stride: 8,
Pix: []uint8{
0xFF, 0xFF, 0xFF, 0xFF, 0x80, 0x80, 0x80, 0xFF,
0x80, 0x80, 0x80, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
},
},
},
{
description: "angle 180.0 at center",
angle: 180.0,
options: &RotationOptions{ResizeBounds: false},
value: &image.RGBA{
Rect: image.Rect(0, 0, 2, 2),
Stride: 8,
Pix: []uint8{
0x80, 0x80, 0x80, 0xFF, 0x80, 0x80, 0x80, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
},
},
expected: &image.RGBA{
Rect: image.Rect(0, 0, 2, 2),
Stride: 8,
Pix: []uint8{
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0x80, 0x80, 0x80, 0xFF, 0x80, 0x80, 0x80, 0xFF,
},
},
},
{
description: "angle 360.0 at center",
angle: 360.0,
options: &RotationOptions{ResizeBounds: false},
value: &image.RGBA{
Rect: image.Rect(0, 0, 2, 2),
Stride: 8,
Pix: []uint8{
0x80, 0x80, 0x80, 0xFF, 0x80, 0x80, 0x80, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
},
},
expected: &image.RGBA{
Rect: image.Rect(0, 0, 2, 2),
Stride: 8,
Pix: []uint8{
0x80, 0x80, 0x80, 0xFF, 0x80, 0x80, 0x80, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
},
},
},
{
description: "angle -90.0 at center",
angle: -90.0,
options: &RotationOptions{ResizeBounds: false},
value: &image.RGBA{
Rect: image.Rect(0, 0, 2, 2),
Stride: 8,
Pix: []uint8{
0x80, 0x80, 0x80, 0xFF, 0x80, 0x80, 0x80, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
},
},
expected: &image.RGBA{
Rect: image.Rect(0, 0, 2, 2),
Stride: 8,
Pix: []uint8{
0x80, 0x80, 0x80, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0x80, 0x80, 0x80, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
},
},
},
{
description: "angle -90.0 at middle bottom",
angle: -90.0,
options: &RotationOptions{ResizeBounds: false, Pivot: &image.Point{1, 2}},
value: &image.RGBA{
Rect: image.Rect(0, 0, 2, 2),
Stride: 8,
Pix: []uint8{
0x80, 0x80, 0x80, 0xFF, 0x80, 0x80, 0x80, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
},
},
expected: &image.RGBA{
Rect: image.Rect(0, 0, 2, 2),
Stride: 8,
Pix: []uint8{
0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
0xFF, 0xFF, 0xFF, 0xFF, 0x0, 0x0, 0x0, 0x0,
},
},
},
{
description: "angle 45.0 at center, don't preserve bounds",
angle: 45.0,
options: &RotationOptions{ResizeBounds: true},
value: &image.RGBA{
Rect: image.Rect(0, 0, 4, 4),
Stride: 4 * 4,
Pix: []uint8{
0x80, 0x80, 0x80, 0xFF, 0x80, 0x80, 0x80, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0x80, 0x80, 0x80, 0xFF, 0x80, 0x80, 0x80, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x80, 0x80, 0x80, 0xFF, 0x80, 0x80, 0x80,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x80, 0x80, 0x80, 0xFF, 0x80, 0x80, 0x80,
},
},
expected: &image.RGBA{
Rect: image.Rect(0, 0, 5, 5),
Stride: 5 * 4,
Pix: []uint8{
0x5C, 0x5C, 0x5C, 0x87, 0x85, 0x85, 0x85, 0xF7, 0x81, 0x81, 0x81, 0xFF, 0x8C, 0x8C, 0x8C, 0xD1, 0x33, 0x33, 0x33, 0x33,
0xF0, 0xF0, 0xF0, 0xF7, 0xD3, 0xD3, 0xD3, 0xFF, 0xAD, 0xAD, 0xAD, 0xFF, 0xEF, 0xEF, 0xEF, 0xFD, 0x95, 0x95, 0x95, 0x95,
0xDF, 0xDE, 0xDE, 0xDE, 0xFD, 0xDA, 0xDA, 0xDB, 0xFC, 0xB3, 0xB3, 0xB7, 0xF6, 0xEC, 0xEC, 0xEC, 0x7E, 0x7E, 0x7E, 0x7E,
0x35, 0x2B, 0x2B, 0x2B, 0xC9, 0x6F, 0x6F, 0x6F, 0xF5, 0x7C, 0x7C, 0x7C, 0x82, 0x54, 0x54, 0x54, 0xA, 0xA, 0xA, 0xA,
0x00, 0x00, 0x00, 0x00, 0x35, 0x1B, 0x1B, 0x1B, 0x79, 0x3D, 0x3D, 0x3D, 0xA, 0x5, 0x5, 0x5, 0x00, 0x00, 0x00, 0x00,
},
},
},
}
for _, c := range cases {
actual := Rotate(c.value, c.angle, c.options)
if !util.RGBAImageEqual(actual, c.expected) {
t.Errorf("%s:\nexpected:%v\nactual:%v", "Rotate "+c.description, util.RGBAToString(c.expected), util.RGBAToString(actual))
}
}
}
func TestFlipH(t *testing.T) {
cases := []struct {
value image.Image
expected *image.RGBA
}{
{
value: &image.RGBA{
Rect: image.Rect(0, 0, 2, 2),
Stride: 8,
Pix: []uint8{
0x80, 0x80, 0x80, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0x80, 0x80, 0x80, 0x80,
},
},
expected: &image.RGBA{
Rect: image.Rect(0, 0, 2, 2),
Stride: 8,
Pix: []uint8{
0xFF, 0xFF, 0xFF, 0xFF, 0x80, 0x80, 0x80, 0xFF,
0x80, 0x80, 0x80, 0x80, 0xFF, 0xFF, 0xFF, 0xFF,
},
},
},
{
value: &image.RGBA{
Rect: image.Rect(0, 0, 3, 2),
Stride: 12,
Pix: []uint8{
0x80, 0x80, 0x80, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0x80, 0x80, 0x80, 0x80, 0xFF, 0xFF, 0xFF, 0xFF,
},
},
expected: &image.RGBA{
Rect: image.Rect(0, 0, 3, 2),
Stride: 12,
Pix: []uint8{
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x80, 0x80, 0x80, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0x80, 0x80, 0x80, 0x80, 0xFF, 0xFF, 0xFF, 0xFF,
},
},
},
{
value: &image.RGBA{
Rect: image.Rect(0, 0, 2, 3),
Stride: 8,
Pix: []uint8{
0x80, 0x80, 0x80, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0x80, 0x80, 0x80, 0x80, 0xFF, 0xFF, 0xFF, 0xFF,
},
},
expected: &image.RGBA{
Rect: image.Rect(0, 0, 2, 3),
Stride: 8,
Pix: []uint8{
0xFF, 0xFF, 0xFF, 0xFF, 0x80, 0x80, 0x80, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0x80, 0x80, 0x80, 0x80,
},
},
},
}
for _, c := range cases {
actual := FlipH(c.value)
if !util.RGBAImageEqual(actual, c.expected) {
t.Errorf("%s: expected: %#v, actual: %#v", "FlipH", util.RGBAToString(c.expected), util.RGBAToString(actual))
}
}
}
func TestFlipV(t *testing.T) {
cases := []struct {
value image.Image
expected *image.RGBA
}{
{
value: &image.RGBA{
Rect: image.Rect(0, 0, 2, 2),
Stride: 8,
Pix: []uint8{
0x80, 0x80, 0x80, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0x80, 0x80, 0x80, 0x80,
},
},
expected: &image.RGBA{
Rect: image.Rect(0, 0, 2, 2),
Stride: 8,
Pix: []uint8{
0xFF, 0xFF, 0xFF, 0xFF, 0x80, 0x80, 0x80, 0x80,
0x80, 0x80, 0x80, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
},
},
},
{
value: &image.RGBA{
Rect: image.Rect(0, 0, 3, 2),
Stride: 12,
Pix: []uint8{
0x80, 0x80, 0x80, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0x80, 0x80, 0x80, 0x80, 0xFF, 0xFF, 0xFF, 0xFF,
},
},
expected: &image.RGBA{
Rect: image.Rect(0, 0, 3, 2),
Stride: 12,
Pix: []uint8{
0xFF, 0xFF, 0xFF, 0xFF, 0x80, 0x80, 0x80, 0x80, 0xFF, 0xFF, 0xFF, 0xFF,
0x80, 0x80, 0x80, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
},
},
},
{
value: &image.RGBA{
Rect: image.Rect(0, 0, 2, 3),
Stride: 8,
Pix: []uint8{
0x80, 0x80, 0x80, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0x80, 0x80, 0x80, 0x80, 0xFF, 0xFF, 0xFF, 0xFF,
},
},
expected: &image.RGBA{
Rect: image.Rect(0, 0, 2, 3),
Stride: 8,
Pix: []uint8{
0x80, 0x80, 0x80, 0x80, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0x80, 0x80, 0x80, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
},
},
},
}
for _, c := range cases {
actual := FlipV(c.value)
if !util.RGBAImageEqual(actual, c.expected) {
t.Errorf("%s: expected: %#v, actual: %#v", "FlipV", util.RGBAToString(c.expected), util.RGBAToString(actual))
}
}
}
func BenchmarkRotation256(b *testing.B) {
benchRotate(256, 256, 90.0, b)
}
func BenchmarkRotation512(b *testing.B) {
benchRotate(512, 512, 90.0, b)
}
func BenchmarkRotation1024(b *testing.B) {
benchRotate(1024, 1024, 90.0, b)
}
func BenchmarkRotation2048(b *testing.B) {
benchRotate(2048, 2048, 90.0, b)
}
func BenchmarkRotation4096(b *testing.B) {
benchRotate(4096, 4096, 90.0, b)
}
func BenchmarkRotation8192(b *testing.B) {
benchRotate(8192, 8192, 90.0, b)
}
func benchRotate(w, h int, rot float64, bench *testing.B) {
img := image.NewRGBA(image.Rect(0, 0, w, h))
bench.ResetTimer()
for i := 0; i < bench.N; i++ {
Rotate(img, rot, nil)
}
}