Premultiply affine transformations explicitly only for non-opaque backgrounds - #217
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kipcole9 merged 1 commit intoJul 28, 2026
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Mirror the conditional premultiplication from the
mapimimplementation inaffine/rotate. The manual premultiply/unpremultiply dance is only needed when a non-opaque background is given, since libvips handles premultiplication correctly in the other cases. This improvement is inherited byshearandtranslatesince they route throughaffine.