go-resize/resize_test.go

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package resize
import (
"image"
"image/color"
"runtime"
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"testing"
)
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var img = image.NewGray16(image.Rect(0, 0, 3, 3))
func init() {
runtime.GOMAXPROCS(runtime.NumCPU())
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img.Set(1, 1, color.White)
}
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func Test_Nearest(t *testing.T) {
m := Resize(6, 0, img, NearestNeighbor)
if m.At(1, 1) == m.At(2, 2) {
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t.Fail()
}
}
func Test_Param1(t *testing.T) {
m := Resize(0, 0, img, NearestNeighbor)
if m.Bounds() != img.Bounds() {
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t.Fail()
}
}
func Test_Param2(t *testing.T) {
m := Resize(100, 0, img, NearestNeighbor)
if m.Bounds() != image.Rect(0, 0, 100, 100) {
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t.Fail()
}
}
func Test_ZeroImg(t *testing.T) {
zeroImg := image.NewGray16(image.Rect(0, 0, 0, 0))
m := Resize(0, 0, zeroImg, NearestNeighbor)
if m.Bounds() != zeroImg.Bounds() {
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t.Fail()
}
}
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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()
}
}
func Benchmark_BigResizeLanczos3(b *testing.B) {
var m image.Image
for i := 0; i < b.N; i++ {
m = Resize(1000, 1000, img, Lanczos3)
}
m.At(0, 0)
}
func Benchmark_Reduction(b *testing.B) {
largeImg := image.NewRGBA(image.Rect(0, 0, 1000, 1000))
var m image.Image
for i := 0; i < b.N; i++ {
m = Resize(300, 300, largeImg, Bicubic)
}
m.At(0, 0)
}
// Benchmark resize of 16 MPix jpeg image to 800px width.
func jpegThumb(b *testing.B, interp InterpolationFunction) {
input := image.NewYCbCr(image.Rect(0, 0, 4896, 3264), image.YCbCrSubsampleRatio422)
var output image.Image
for i := 0; i < b.N; i++ {
output = Resize(800, 0, input, interp)
}
output.At(0, 0)
}
func Benchmark_LargeJpegThumbNearestNeighbor(b *testing.B) {
jpegThumb(b, NearestNeighbor)
}
func Benchmark_LargeJpegThumbBilinear(b *testing.B) {
jpegThumb(b, Bilinear)
}
func Benchmark_LargeJpegThumbBicubic(b *testing.B) {
jpegThumb(b, Bicubic)
}
func Benchmark_LargeJpegThumbMitchellNetravali(b *testing.B) {
jpegThumb(b, MitchellNetravali)
}
func Benchmark_LargeJpegThumbLanczos2(b *testing.B) {
jpegThumb(b, Lanczos2)
}
func Benchmark_LargeJpegThumbLanczos3(b *testing.B) {
jpegThumb(b, Lanczos3)
}