0f9f918da3
These image types use premultiplied alpha values which are also used during the interpolation. If we'd use NRGBA, NRGBA64 as output, we'd have to reverse the premultiplication.
331 lines
8.3 KiB
Go
331 lines
8.3 KiB
Go
package resize
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import (
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"image"
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"image/color"
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"runtime"
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"testing"
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)
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var img = image.NewGray16(image.Rect(0, 0, 3, 3))
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func init() {
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runtime.GOMAXPROCS(runtime.NumCPU())
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img.Set(1, 1, color.White)
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}
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func Test_Param1(t *testing.T) {
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m := Resize(0, 0, img, NearestNeighbor)
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if m.Bounds() != img.Bounds() {
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t.Fail()
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}
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}
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func Test_Param2(t *testing.T) {
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m := Resize(100, 0, img, NearestNeighbor)
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if m.Bounds() != image.Rect(0, 0, 100, 100) {
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t.Fail()
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}
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}
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func Test_ZeroImg(t *testing.T) {
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zeroImg := image.NewGray16(image.Rect(0, 0, 0, 0))
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m := Resize(0, 0, zeroImg, NearestNeighbor)
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if m.Bounds() != zeroImg.Bounds() {
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t.Fail()
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}
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}
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func Test_CorrectResize(t *testing.T) {
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zeroImg := image.NewGray16(image.Rect(0, 0, 256, 256))
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m := Resize(60, 0, zeroImg, NearestNeighbor)
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if m.Bounds() != image.Rect(0, 0, 60, 60) {
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t.Fail()
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}
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}
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func Test_SameColorWithRGBA(t *testing.T) {
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img := image.NewRGBA(image.Rect(0, 0, 20, 20))
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for y := img.Bounds().Min.Y; y < img.Bounds().Max.Y; y++ {
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for x := img.Bounds().Min.X; x < img.Bounds().Max.X; x++ {
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img.SetRGBA(x, y, color.RGBA{0x80, 0x80, 0x80, 0xFF})
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}
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}
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out := Resize(10, 10, img, Lanczos3)
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for y := out.Bounds().Min.Y; y < out.Bounds().Max.Y; y++ {
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for x := out.Bounds().Min.X; x < out.Bounds().Max.X; x++ {
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color := out.At(x, y).(color.RGBA)
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if color.R != 0x80 || color.G != 0x80 || color.B != 0x80 || color.A != 0xFF {
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t.Errorf("%+v", color)
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}
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}
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}
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}
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func Test_SameColorWithNRGBA(t *testing.T) {
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img := image.NewNRGBA(image.Rect(0, 0, 20, 20))
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for y := img.Bounds().Min.Y; y < img.Bounds().Max.Y; y++ {
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for x := img.Bounds().Min.X; x < img.Bounds().Max.X; x++ {
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img.SetNRGBA(x, y, color.NRGBA{0x80, 0x80, 0x80, 0xFF})
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}
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}
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out := Resize(10, 10, img, Lanczos3)
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for y := out.Bounds().Min.Y; y < out.Bounds().Max.Y; y++ {
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for x := out.Bounds().Min.X; x < out.Bounds().Max.X; x++ {
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color := out.At(x, y).(color.RGBA)
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if color.R != 0x80 || color.G != 0x80 || color.B != 0x80 || color.A != 0xFF {
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t.Errorf("%+v", color)
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}
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}
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}
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}
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func Test_SameColorWithRGBA64(t *testing.T) {
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img := image.NewRGBA64(image.Rect(0, 0, 20, 20))
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for y := img.Bounds().Min.Y; y < img.Bounds().Max.Y; y++ {
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for x := img.Bounds().Min.X; x < img.Bounds().Max.X; x++ {
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img.SetRGBA64(x, y, color.RGBA64{0x8000, 0x8000, 0x8000, 0xFFFF})
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}
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}
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out := Resize(10, 10, img, Lanczos3)
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for y := out.Bounds().Min.Y; y < out.Bounds().Max.Y; y++ {
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for x := out.Bounds().Min.X; x < out.Bounds().Max.X; x++ {
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color := out.At(x, y).(color.RGBA64)
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if color.R != 0x8000 || color.G != 0x8000 || color.B != 0x8000 || color.A != 0xFFFF {
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t.Errorf("%+v", color)
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}
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}
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}
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}
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func Test_SameColorWithNRGBA64(t *testing.T) {
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img := image.NewNRGBA64(image.Rect(0, 0, 20, 20))
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for y := img.Bounds().Min.Y; y < img.Bounds().Max.Y; y++ {
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for x := img.Bounds().Min.X; x < img.Bounds().Max.X; x++ {
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img.SetNRGBA64(x, y, color.NRGBA64{0x8000, 0x8000, 0x8000, 0xFFFF})
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}
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}
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out := Resize(10, 10, img, Lanczos3)
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for y := out.Bounds().Min.Y; y < out.Bounds().Max.Y; y++ {
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for x := out.Bounds().Min.X; x < out.Bounds().Max.X; x++ {
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color := out.At(x, y).(color.RGBA64)
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if color.R != 0x8000 || color.G != 0x8000 || color.B != 0x8000 || color.A != 0xFFFF {
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t.Errorf("%+v", color)
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}
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}
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}
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}
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func Test_SameColorWithGray(t *testing.T) {
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img := image.NewGray(image.Rect(0, 0, 20, 20))
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for y := img.Bounds().Min.Y; y < img.Bounds().Max.Y; y++ {
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for x := img.Bounds().Min.X; x < img.Bounds().Max.X; x++ {
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img.SetGray(x, y, color.Gray{0x80})
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}
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}
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out := Resize(10, 10, img, Lanczos3)
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for y := out.Bounds().Min.Y; y < out.Bounds().Max.Y; y++ {
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for x := out.Bounds().Min.X; x < out.Bounds().Max.X; x++ {
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color := out.At(x, y).(color.Gray)
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if color.Y != 0x80 {
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t.Errorf("%+v", color)
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}
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}
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}
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}
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func Test_SameColorWithGray16(t *testing.T) {
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img := image.NewGray16(image.Rect(0, 0, 20, 20))
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for y := img.Bounds().Min.Y; y < img.Bounds().Max.Y; y++ {
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for x := img.Bounds().Min.X; x < img.Bounds().Max.X; x++ {
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img.SetGray16(x, y, color.Gray16{0x8000})
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}
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}
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out := Resize(10, 10, img, Lanczos3)
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for y := out.Bounds().Min.Y; y < out.Bounds().Max.Y; y++ {
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for x := out.Bounds().Min.X; x < out.Bounds().Max.X; x++ {
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color := out.At(x, y).(color.Gray16)
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if color.Y != 0x8000 {
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t.Errorf("%+v", color)
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}
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}
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}
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}
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func Test_Bounds(t *testing.T) {
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img := image.NewRGBA(image.Rect(20, 10, 200, 99))
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out := Resize(80, 80, img, Lanczos2)
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out.At(0, 0)
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}
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func Test_SameSizeReturnsOriginal(t *testing.T) {
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img := image.NewRGBA(image.Rect(0, 0, 10, 10))
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out := Resize(0, 0, img, Lanczos2)
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if img != out {
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t.Fail()
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}
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out = Resize(10, 10, img, Lanczos2)
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if img != out {
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t.Fail()
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}
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}
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func Test_PixelCoordinates(t *testing.T) {
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checkers := image.NewGray(image.Rect(0, 0, 4, 4))
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checkers.Pix = []uint8{
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255, 0, 255, 0,
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0, 255, 0, 255,
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255, 0, 255, 0,
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0, 255, 0, 255,
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}
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resized := Resize(12, 12, checkers, NearestNeighbor).(*image.Gray)
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if resized.Pix[0] != 255 || resized.Pix[1] != 255 || resized.Pix[2] != 255 {
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t.Fail()
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}
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if resized.Pix[3] != 0 || resized.Pix[4] != 0 || resized.Pix[5] != 0 {
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t.Fail()
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}
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}
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func Test_ResizeWithPremultipliedAlpha(t *testing.T) {
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img := image.NewRGBA(image.Rect(0, 0, 1, 4))
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for y := img.Bounds().Min.Y; y < img.Bounds().Max.Y; y++ {
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// 0x80 = 0.5 * 0xFF.
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img.SetRGBA(0, y, color.RGBA{0x80, 0x80, 0x80, 0x80})
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}
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out := Resize(1, 2, img, MitchellNetravali)
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outputColor := out.At(0, 0).(color.RGBA)
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if outputColor.R != 0x80 {
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t.Fail()
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}
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}
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func Test_ResizeWithTranslucentColor(t *testing.T) {
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img := image.NewNRGBA(image.Rect(0, 0, 1, 2))
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// Set the pixel colors to an "invisible green" and white.
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// After resizing, the green shouldn't be visible.
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img.SetNRGBA(0, 0, color.NRGBA{0x00, 0xFF, 0x00, 0x00})
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img.SetNRGBA(0, 1, color.NRGBA{0x00, 0x00, 0x00, 0xFF})
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out := Resize(1, 1, img, Bilinear)
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_, g, _, _ := out.At(0, 0).RGBA()
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if g != 0x00 {
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t.Errorf("%+v", g)
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}
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}
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const (
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// Use a small image size for benchmarks. We don't want memory performance
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// to affect the benchmark results.
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benchMaxX = 250
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benchMaxY = 250
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// Resize values near the original size require increase the amount of time
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// resize spends converting the image.
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benchWidth = 200
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benchHeight = 200
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)
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func benchRGBA(b *testing.B, interp InterpolationFunction) {
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m := image.NewRGBA(image.Rect(0, 0, benchMaxX, benchMaxY))
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// Initialize m's pixels to create a non-uniform image.
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for y := m.Rect.Min.Y; y < m.Rect.Max.Y; y++ {
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for x := m.Rect.Min.X; x < m.Rect.Max.X; x++ {
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i := m.PixOffset(x, y)
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m.Pix[i+0] = uint8(y + 4*x)
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m.Pix[i+1] = uint8(y + 4*x)
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m.Pix[i+2] = uint8(y + 4*x)
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m.Pix[i+3] = uint8(4*y + x)
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}
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}
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var out image.Image
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b.ResetTimer()
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for i := 0; i < b.N; i++ {
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out = Resize(benchWidth, benchHeight, m, interp)
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}
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out.At(0, 0)
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}
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// The names of some interpolation functions are truncated so that the columns
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// of 'go test -bench' line up.
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func Benchmark_Nearest_RGBA(b *testing.B) {
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benchRGBA(b, NearestNeighbor)
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}
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func Benchmark_Bilinear_RGBA(b *testing.B) {
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benchRGBA(b, Bilinear)
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}
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func Benchmark_Bicubic_RGBA(b *testing.B) {
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benchRGBA(b, Bicubic)
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}
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func Benchmark_Mitchell_RGBA(b *testing.B) {
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benchRGBA(b, MitchellNetravali)
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}
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func Benchmark_Lanczos2_RGBA(b *testing.B) {
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benchRGBA(b, Lanczos2)
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}
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func Benchmark_Lanczos3_RGBA(b *testing.B) {
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benchRGBA(b, Lanczos3)
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}
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func benchYCbCr(b *testing.B, interp InterpolationFunction) {
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m := image.NewYCbCr(image.Rect(0, 0, benchMaxX, benchMaxY), image.YCbCrSubsampleRatio422)
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// Initialize m's pixels to create a non-uniform image.
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for y := m.Rect.Min.Y; y < m.Rect.Max.Y; y++ {
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for x := m.Rect.Min.X; x < m.Rect.Max.X; x++ {
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yi := m.YOffset(x, y)
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ci := m.COffset(x, y)
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m.Y[yi] = uint8(16*y + x)
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m.Cb[ci] = uint8(y + 16*x)
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m.Cr[ci] = uint8(y + 16*x)
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}
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}
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var out image.Image
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b.ResetTimer()
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for i := 0; i < b.N; i++ {
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out = Resize(benchWidth, benchHeight, m, interp)
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}
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out.At(0, 0)
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}
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func Benchmark_Nearest_YCC(b *testing.B) {
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benchYCbCr(b, NearestNeighbor)
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}
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func Benchmark_Bilinear_YCC(b *testing.B) {
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benchYCbCr(b, Bilinear)
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}
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func Benchmark_Bicubic_YCC(b *testing.B) {
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benchYCbCr(b, Bicubic)
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}
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func Benchmark_Mitchell_YCC(b *testing.B) {
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benchYCbCr(b, MitchellNetravali)
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}
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func Benchmark_Lanczos2_YCC(b *testing.B) {
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benchYCbCr(b, Lanczos2)
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}
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func Benchmark_Lanczos3_YCC(b *testing.B) {
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benchYCbCr(b, Lanczos3)
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}
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