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resize.go
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/
resize.go
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package main
import (
"fmt"
"image"
_ "image/jpeg"
"image/png"
"os"
"time"
"image/draw"
"github.com/bamiaux/rez"
"github.com/disintegration/gift"
"github.com/disintegration/imaging"
nfnt_resize "github.com/nfnt/resize"
x_draw "golang.org/x/image/draw"
)
const (
width = 600
height = 400
convertSource = true
)
var newImageFunc = func(r image.Rectangle) draw.Image {
return image.NewRGBA(r)
}
func main() {
im := load()
resize(im, newResizeFuncNfnt(nfnt_resize.NearestNeighbor), "nfnt_nearest_neighbor.png")
resize(im, newResizeFuncNfnt(nfnt_resize.Bilinear), "nfnt_bilinear.png")
resize(im, newResizeFuncNfnt(nfnt_resize.Bicubic), "nfnt_bicubic.png")
resize(im, newResizeFuncNfnt(nfnt_resize.MitchellNetravali), "nfnt_mitchell_netravali.png")
resize(im, newResizeFuncNfnt(nfnt_resize.Lanczos2), "nfnt_lanczos2.png")
resize(im, newResizeFuncNfnt(nfnt_resize.Lanczos3), "nfnt_lanczos3.png")
resize(im, newResizeFuncXDraw(x_draw.NearestNeighbor), "x_draw_nearest_neighbor.png")
resize(im, newResizeFuncXDraw(x_draw.ApproxBiLinear), "x_draw_approx_bilinear.png")
resize(im, newResizeFuncXDraw(x_draw.BiLinear), "x_draw_bilinear.png")
resize(im, newResizeFuncXDraw(x_draw.CatmullRom), "x_draw_catmull_rom.png")
resize(im, newResizeFuncImaging(imaging.NearestNeighbor), "imaging_nearest_neighbor.png")
resize(im, newResizeFuncImaging(imaging.Box), "imaging_box.png")
resize(im, newResizeFuncImaging(imaging.Linear), "imaging_linear.png")
resize(im, newResizeFuncImaging(imaging.MitchellNetravali), "imaging_mitchell_netravali.png")
resize(im, newResizeFuncImaging(imaging.CatmullRom), "imaging_catmull_rom.png")
resize(im, newResizeFuncImaging(imaging.Gaussian), "imaging_gaussian.png")
resize(im, newResizeFuncImaging(imaging.Lanczos), "imaging_lanczos.png")
resize(im, newResizeFuncGift(gift.NearestNeighborResampling), "gift_nearest_neighbor.png")
resize(im, newResizeFuncGift(gift.BoxResampling), "gift_box.png")
resize(im, newResizeFuncGift(gift.LinearResampling), "gift_linear.png")
resize(im, newResizeFuncGift(gift.CubicResampling), "gift_cubic.png")
resize(im, newResizeFuncGift(gift.LanczosResampling), "gift_lanczos.png")
func() {
defer func() {
err := recover()
if err != nil {
fmt.Printf("error with rez: %s\n", err)
}
}()
resize(im, newResizeFuncRez(rez.NewBilinearFilter()), "rez_bilinear.png")
resize(im, newResizeFuncRez(rez.NewBicubicFilter()), "rez_bicubic.png")
resize(im, newResizeFuncRez(rez.NewLanczosFilter(2)), "rez_lanczos2.png")
resize(im, newResizeFuncRez(rez.NewLanczosFilter(3)), "rez_lanczos3.png")
}()
}
func load() image.Image {
f, err := os.Open("image.jpg")
if err != nil {
panic(err)
}
defer f.Close()
im, _, err := image.Decode(f)
if err != nil {
panic(err)
}
if convertSource {
newIm := newImageFunc(image.Rect(0, 0, im.Bounds().Dx(), im.Bounds().Dy()))
draw.Draw(newIm, newIm.Bounds(), im, im.Bounds().Min, draw.Src)
im = newIm
}
return im
}
func resize(im image.Image, res resizeFunc, fileName string) {
start := time.Now()
im = res(im)
fmt.Printf("%s: %s\n", fileName, time.Since(start))
save(im, fileName)
}
type resizeFunc func(image.Image) image.Image
func newResizeFuncNfnt(interp nfnt_resize.InterpolationFunction) resizeFunc {
return func(im image.Image) image.Image {
return nfnt_resize.Resize(width, height, im, interp)
}
}
func newResizeFuncXDraw(interp x_draw.Interpolator) resizeFunc {
return func(im image.Image) image.Image {
newIm := newImageFunc(image.Rect(0, 0, width, height))
interp.Scale(newIm, newIm.Bounds(), im, im.Bounds(), x_draw.Src, nil)
return newIm
}
}
func newResizeFuncImaging(filter imaging.ResampleFilter) resizeFunc {
return func(im image.Image) image.Image {
return imaging.Resize(im, width, height, filter)
}
}
func newResizeFuncGift(resampling gift.Resampling) resizeFunc {
return func(im image.Image) image.Image {
g := gift.New(gift.Resize(width, height, resampling))
newIm := newImageFunc(g.Bounds(im.Bounds()))
g.Draw(newIm, im)
return newIm
}
}
func newResizeFuncRez(filter rez.Filter) resizeFunc {
return func(im image.Image) image.Image {
newIm := newImageFunc(image.Rect(0, 0, width, height))
err := rez.Convert(newIm, im, filter)
if err != nil {
panic(err)
}
return newIm
}
}
func save(im image.Image, fileName string) {
os.Mkdir("out", 0755)
f, err := os.Create("out/" + fileName)
if err != nil {
panic(err)
}
defer f.Close()
png.Encode(f, im)
}