Clamp abyss policy for filter3x3#2874
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This adds the clamp/replicate abyss policy to
filter3x3. This is consistent withblurandfast_blur.Why is this necessary?
Previously,
filter3x3would leave a 1-pixel border around the filtered image. This made the function a lot less useful. This PR fixes this defect by applying the filter to all pixels of the image.As the TODO says, this function is currently slower than it has to be. This can be addressed in future PRs. I focused on making it correct for now.