Use bilinear filtering for draw_image w/ non-simple transformation #32
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If the transform is a simple (integer valued) translation, continue using the nearest neighbor sampling.
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As noted in enthought/enable#247, drawing images with a non-integral offset gives a strange artifact along the edge of the image. This was apparently a consequence of nearest-neighbor sampling.
@corranwebster: This should fix what you were seeing. There is still discoloration at the edges, but it's colored now, instead of the gray "background color" that was showing before. I believe this to be the correct result.