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Skip resizing if requested size bigger then original

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orian 2015-10-14 18:25:48 +02:00
parent 431898ec9a
commit 8efff4b6a9
2 changed files with 21 additions and 15 deletions
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10
transform.go
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@ -79,7 +79,7 @@ func Transform(img []byte, opt Options) ([]byte, error) {
return buf.Bytes(), nil
}
func resizeParams(m image.Image, opt *Options) (w, h int) {
func resizeParams(m image.Image, opt *Options) (w, h int, resize bool) {
// convert percentage width and height values to absolute values
imgW := m.Bounds().Max.X - m.Bounds().Min.X
imgH := m.Bounds().Max.Y - m.Bounds().Min.Y
@ -107,14 +107,18 @@ func resizeParams(m image.Image, opt *Options) (w, h int) {
h = imgH
}
}
return
// if requested width and height match the original, skip resizing
if (w == imgW || w == 0) && (h == imgH || h == 0) {
return 0, 0, false
}
return w, h, true
}
// transformImage modifies the image m based on the transformations specified
// in opt.
func transformImage(m image.Image, opt Options) image.Image {
// resize if needed
if w, h := resizeParams(m, &opt); w != 0 || h != 0 {
if w, h, resize := resizeParams(m, &opt); resize {
if opt.Fit {
m = imaging.Fit(m, w, h, resampleFilter)
} else {