Fix non-power-of-two texture mip size #43
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Non-power-of-two textures eventually get a mip dimension that isn't divisible by 4; the length computation didn't properly round that to block boundaries.
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Non-power-of-two textures eventually get a mip dimension that isn't divisible by 4; the length computation didn't properly round that to block boundaries.
Note: there is still some faulty logic in DataProvider.cpp that misbehaves for NPOT textures, so this doesn't fully fix the case when mips are generated; that would require a separate fix to the downsampling logic (ideally including masking off parts of the NPOT mips that are not used...)