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Fix for blurry images from WEBP input and small output dimensions

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This commit is contained in:
Nils Juenemann 2021-03-31 09:44:41 +02:00
parent d0fb333ce4
commit c51a11f6d2
1 changed files with 28 additions and 20 deletions
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48
resizer.go
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@ -69,6 +69,7 @@ func resizer(buf []byte, o Options) ([]byte, error) {
shrink := calculateShrink(factor, o.Interpolator)
residual := calculateResidual(factor, shrink)
fmt.Printf("size=%vx%v, factor=%v, shrink=%v, residual=%v, opts=%+v\n", inWidth, inHeight, factor, shrink, residual, o)
// Do not enlarge the output if the input width or height
// are already less than the required dimensions
if !o.Enlarge && !o.Force {
@ -449,29 +450,36 @@ func shrinkImage(image *C.VipsImage, o Options, residual float64, shrink int) (*
}
func shrinkOnLoad(buf []byte, input *C.VipsImage, imageType ImageType, factor float64, shrink int) (*C.VipsImage, float64, error) {
var image *C.VipsImage
var err error
var (
image *C.VipsImage
err error
)
if shrink < 2 {
return nil, 0, fmt.Errorf("only available for shrink >=2")
}
shrinkOnLoad := 1
// Recalculate integral shrink and double residual
switch {
case shrink >= 8:
factor = factor / 8
shrinkOnLoad = 8
case shrink >= 4:
factor = factor / 4
shrinkOnLoad = 4
case shrink >= 2:
factor = factor / 2
shrinkOnLoad = 2
}
// Reload input using shrink-on-load
if imageType == JPEG && shrink >= 2 {
shrinkOnLoad := 1
// Recalculate integral shrink and double residual
switch {
case shrink >= 8:
factor = factor / 8
shrinkOnLoad = 8
case shrink >= 4:
factor = factor / 4
shrinkOnLoad = 4
case shrink >= 2:
factor = factor / 2
shrinkOnLoad = 2
}
switch imageType {
case JPEG:
image, err = vipsShrinkJpeg(buf, input, shrinkOnLoad)
} else if imageType == WEBP {
image, err = vipsShrinkWebp(buf, input, shrink)
} else {
case WEBP:
image, err = vipsShrinkWebp(buf, input, shrinkOnLoad)
default:
return nil, 0, fmt.Errorf("%v doesn't support shrink on load", ImageTypeName(imageType))
}