go-resize/resize_test.go
jst 8f586c4f06 Add benchmarks to compare execution times.
Run "go test -bench LargeJpegThumb" to benchmark all functions at once.
2014-01-18 11:55:34 +01:00

125 lines
2.5 KiB
Go

package resize
import (
"image"
"image/color"
"runtime"
"testing"
)
var img = image.NewGray16(image.Rect(0, 0, 3, 3))
func init() {
runtime.GOMAXPROCS(runtime.NumCPU())
img.Set(1, 1, color.White)
}
func Test_Nearest(t *testing.T) {
m := Resize(6, 0, img, NearestNeighbor)
if m.At(1, 1) == m.At(2, 2) {
t.Fail()
}
}
func Test_Param1(t *testing.T) {
m := Resize(0, 0, img, NearestNeighbor)
if m.Bounds() != img.Bounds() {
t.Fail()
}
}
func Test_Param2(t *testing.T) {
m := Resize(100, 0, img, NearestNeighbor)
if m.Bounds() != image.Rect(0, 0, 100, 100) {
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() {
t.Fail()
}
}
func Test_CorrectResize(t *testing.T) {
zeroImg := image.NewGray16(image.Rect(0, 0, 256, 256))
m := Resize(60, 0, zeroImg, NearestNeighbor)
if m.Bounds() != image.Rect(0, 0, 60, 60) {
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_BigResizeLanczos3Lut(b *testing.B) {
var m image.Image
for i := 0; i < b.N; i++ {
m = Resize(1000, 1000, img, Lanczos3Lut)
}
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_LargeJpegThumbLanczos2Lut(b *testing.B) {
jpegThumb(b, Lanczos2Lut)
}
func Benchmark_LargeJpegThumbLanczos2(b *testing.B) {
jpegThumb(b, Lanczos2)
}
func Benchmark_LargeJpegThumbLanczos3Lut(b *testing.B) {
jpegThumb(b, Lanczos3Lut)
}
func Benchmark_LargeJpegThumbLanczos3(b *testing.B) {
jpegThumb(b, Lanczos3)
}