This is the main fix for the situation where we try to load PNGs after the image cache has been saturated - instead of requiring 1 Meg as a temporary buffer to perform the swizzle operation on a full image (ie 512 * 512 texture size), these mods allow the swizzle to work in line with a temp buffer of 512 * 8 lines (ie 16K of memory). I also fixed a case where the swizzle didn't operate correctly on PNGs that weren't an even multiplier height of 8 - we'd drop the remaining lines on the floor, creating garbage lines at the bottom of those images.
wrenczes@gmail.com
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