Function signature changed again, no need for multiple return value
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@ -21,7 +21,8 @@ Import package with
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import "github.com/nfnt/resize"
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```
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Resize creates a scaled image with new dimensions (width, height) using the interpolation function interp.
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Resize creates a scaled image with new dimensions (`width`, `height`) using the interpolation function interp.
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If either `width` or `height` is set to 0, it will be set to an aspect ratio preserving value.
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```go
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resize.Resize(width, height int, img image.Image, interp resize.InterpolationFunction) image.Image, error
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@ -60,10 +61,8 @@ func main() {
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file.Close()
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// resize to width 1000 using Lanczos resampling
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m, err := resize.Resize(1000, -1, img, resize.Lanczos3)
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if err != nil {
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return
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}
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// and preserve aspect ration
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m := resize.Resize(1000, 0, img, resize.Lanczos3)
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out, err := os.Create("test_resized.jpg")
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if err != nil {
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20
resize.go
20
resize.go
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@ -25,7 +25,6 @@ THIS SOFTWARE.
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package resize
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import (
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"errors"
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"image"
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"image/color"
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"runtime"
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@ -47,9 +46,9 @@ func (t *Trans2) Eval(x, y float32) (u, v float32) {
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}
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// Calculate scaling factors using old and new image dimensions.
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func calcFactors(width, height int, oldWidth, oldHeight float32) (scaleX, scaleY float32) {
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if width == -1 {
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if height == -1 {
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func calcFactors(width, height uint, oldWidth, oldHeight float32) (scaleX, scaleY float32) {
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if width == 0 {
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if height == 0 {
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scaleX = 1.0
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scaleY = 1.0
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} else {
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@ -58,7 +57,7 @@ func calcFactors(width, height int, oldWidth, oldHeight float32) (scaleX, scaleY
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}
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} else {
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scaleX = oldWidth / float32(width)
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if height == -1 {
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if height == 0 {
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scaleY = scaleX
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} else {
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scaleY = oldHeight / float32(height)
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@ -73,14 +72,10 @@ type InterpolationFunction func(float32, float32, image.Image) color.RGBA64
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// Resize an image to new width w and height h using the interpolation function interp.
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// A new image with the given dimensions will be returned.
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// If one of the parameters w or h is set to -1, its size will be calculated so that
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// If one of the parameters w or h is set to 0, its size will be calculated so that
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// the aspect ratio is that of the originating image.
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// The resizing algorithm uses channels for parallel computation.
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func Resize(width, height int, img image.Image, interp InterpolationFunction) (out image.Image, err error) {
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if width < -1 || height < -1 {
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err = errors.New("Wrong width/height argument")
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return
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}
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func Resize(width, height uint, img image.Image, interp InterpolationFunction) image.Image {
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oldBounds := img.Bounds()
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oldWidth := float32(oldBounds.Dx())
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oldHeight := float32(oldBounds.Dy())
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@ -108,7 +103,6 @@ func Resize(width, height int, img image.Image, interp InterpolationFunction) (o
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for i := 0; i < NCPU; i++ {
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<-c
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}
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out = m
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return
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return m
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}
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@ -11,30 +11,23 @@ var img = image.NewGray16(image.Rect(0, 0, 3, 3))
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func Test_Nearest(t *testing.T) {
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img.Set(1, 1, color.White)
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m, err := Resize(6, -1, img, NearestNeighbor)
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m := Resize(6, 0, img, NearestNeighbor)
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if err != nil || m.At(2, 2) != m.At(3, 3) {
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if m.At(2, 2) != m.At(3, 3) {
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t.Fail()
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}
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}
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func Test_Param1(t *testing.T) {
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m, err := Resize(-1, -1, img, NearestNeighbor)
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if err != nil || m.Bounds() != img.Bounds() {
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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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_, err := Resize(-100, -1, img, NearestNeighbor)
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if err == nil {
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t.Fail()
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}
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}
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func Test_Param3(t *testing.T) {
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m, err := Resize(0, -1, img, NearestNeighbor)
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if err != nil || m.Bounds() != image.Rect(0, 0, 0, 0) {
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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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@ -42,8 +35,8 @@ func Test_Param3(t *testing.T) {
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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, err := Resize(-1, -1, zeroImg, NearestNeighbor)
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if err != nil || m.Bounds() != zeroImg.Bounds() {
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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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