PixelBits : Use a fully opaque mask if no colorkey found
Fix the opaque mask of PixelBits
Revert "Fix the opaque mask of PixelBits"

This reverts commit 2e8550e262135c8905fdaad0d6de2a23eb4eb862.
Revert "PixelBits : Use a fully opaque mask if no colorkey found"

This reverts commit 34e6babfac033a8230e7a3ec0540def9ca9cf40a.
Use alpha channel if colorkey is not found for pixel-precise mask (first attempt)