Improve src_rect handling in sprites, and especially the wave effect #147
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…too-large dimensions. I also fixed a small bug in how the wave position was calculated. I ALSO fixed src_rects in general for waves. (How was that not noticed before now?)
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This lets us properly handle src_rects that extend beyond the bounds of the bitmap. I doubt it's used much if it all in the wild, but I'm making use of it for my next PR...
Also, apparently the wave effect wasn't using src_rect's position at all. I'm amazed it took this long to get noticed.