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Merge pull request #1 from blippar/check_alpha

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Check for alpha channel before flattening PNG
This commit is contained in:
henry-blip 2016-05-13 18:38:32 -07:00
commit 45cfc1a75a
1 changed files with 7 additions and 6 deletions
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13
vips.go
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@ -274,14 +274,15 @@ func vipsFlattenBackground(image *C.VipsImage, background Color) (*C.VipsImage,
C.double(background.B),
}
err := C.vips_flatten_background_brigde(image, &outImage, (*C.double)(&backgroundC[0]))
if int(err) != 0 {
return nil, catchVipsError()
if vipsHasAlpha(image) {
err := C.vips_flatten_background_brigde(image, &outImage, (*C.double)(&backgroundC[0]))
if int(err) != 0 {
return nil, catchVipsError()
}
C.g_object_unref(C.gpointer(image))
image = outImage
}
C.g_object_unref(C.gpointer(image))
image = outImage
return image, nil
}