Support arbitrary masks for uncompressed RGB DDS images #7589
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Resolves #7517
When DDS images contain uncompressed RGB data, they have red, green, blue (and possibly alpha) masks to filter the bits of each pixel into the final value for the channel.
Currently, Pillow only supports masks giving 8 bits per channel.
Pillow/src/PIL/DdsImagePlugin.py
Lines 150 to 157 in e1291b8
The linked issue has found an image with masks that use 5 bits per channel. So this PR adds support for arbitrary masks by adding a dedicated Python decoder.