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fix(#31)

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This commit is contained in:
Tomas Aparicio 2015-04-16 02:24:44 +02:00
parent eb933a8c38
commit c2a502a611
3 changed files with 17 additions and 16 deletions
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28
resize.go
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@ -48,6 +48,13 @@ func Resize(buf []byte, o Options) ([]byte, error) {
shrink := int(math.Max(math.Floor(factor), 1))
residual := float64(shrink) / factor
// Calculate integral box shrink
windowSize := vipsWindowSize(o.Interpolator.String())
if factor >= 2 && windowSize > 3 {
// Shrink less, affine more with interpolators that use at least 4x4 pixel window, e.g. bicubic
shrink = int(math.Max(float64(math.Floor(factor*3.0/windowSize)), 1))
}
// Do not enlarge the output if the input width *or* height are already less than the required dimensions
if o.Enlarge == false {
if inWidth < o.Width && inHeight < o.Height {
@ -65,24 +72,16 @@ func Resize(buf []byte, o Options) ([]byte, error) {
if err != nil {
return nil, err
}
if tmpImage != nil {
image = tmpImage
factor = math.Max(factor, 1.0)
shrink = int(math.Floor(factor))
residual = float64(shrink) / factor
}
}
// Calculate integral box shrink
windowSize := vipsWindowSize(o.Interpolator.String())
if factor >= 2 && windowSize > 3 {
// Shrink less, affine more with interpolators that use at least 4x4 pixel window, e.g. bicubic
shrink = int(math.Max(float64(math.Floor(factor*3.0/windowSize)), 1))
image = tmpImage
factor = math.Max(factor, 1.0)
shrink = int(math.Floor(factor))
residual = float64(shrink) / factor
}
// Transform image if necessary
shouldTransform := o.Width != inWidth || o.Height != inHeight || o.AreaWidth > 0 || o.AreaHeight > 0
if shouldTransform {
// Use vips_shrink with the integral reduction
if shrink > 1 {
image, residual, err = shrinkImage(image, o, residual, shrink)
@ -90,7 +89,8 @@ func Resize(buf []byte, o Options) ([]byte, error) {
return nil, err
}
}
// Use vips_affine with the remaining float part
// Affine with the remaining float part
if residual != 0 {
image, err = vipsAffine(image, residual, o.Interpolator)
if err != nil {

2
resize_test.go
View file

@ -9,7 +9,7 @@ import (
func TestResize(t *testing.T) {
options := Options{Width: 800, Height: 600}
buf, _ := Read("fixtures/test.jpg")
buf, _ := Read("../vips/fixtures/large.jpg")
newImg, err := Resize(buf, options)
if err != nil {

3
vips.go
View file

@ -229,6 +229,7 @@ func vipsSave(image *C.struct__VipsImage, o vipsSaveOptions) ([]byte, error) {
err = C.vips_webpsave_bridge(image, &ptr, &length, 1, C.int(o.Quality), 0)
break
default:
debug("Save JPEG options: Q: %s", o.Quality)
err = C.vips_jpegsave_bridge(image, &ptr, &length, 1, C.int(o.Quality), 0)
break
}
@ -239,7 +240,7 @@ func vipsSave(image *C.struct__VipsImage, o vipsSaveOptions) ([]byte, error) {
buf := C.GoBytes(ptr, C.int(length))
// Cleanup
// Clean up
C.g_free(C.gpointer(ptr))
C.vips_error_clear()