e4a93d7b8c
For high radii Kuwahara, we use a Summed Area Table (SAT) implementation to accelerate the classic variant of the algorithm. The problem is that due to limited floating point precision, the SAT can produce artifacts in its output. An attempt to fix this was implemented in #114191, and while that patch improved precision by 10x, the artifacts still existed, albeit less noticeable. But since the improved precision also meant a performance penalty, it was decided that the improvement is not worth it. Since the artifacts are only noticeable for scenes with very high values, this patch adds a High Precision option that defaults to false and can be enabled by the user upon noticing any artifacts. The option simply uses direction convolution instead of SAT in this case. The downside, of course, is that it can be orders of magnitude slower. An alternative to using this option is for the user to clamp the input or downsample the image. Both methods should be documented in the documentation. Fixes: #113578. Pull Request: https://projects.blender.org/blender/blender/pulls/115763
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