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Fix #124842: Prevent rounding errors from introducing black pixels in Translate #124928

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Bill-Spitzak wants to merge 1 commits from Bill-Spitzak:translate into main
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Bill-Spitzak commented 2024-07-17 22:31:38 +02:00
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Since translate only reads pixels inside the buffer, it is safe to treat Clip as
Extend.

IMHO the actual bug is in COM_MemoryBuffer. wrap_pixel() must treat Clip as Extend,
and code rearranged so calls to it are done after the clipping tests. For Nearest
sampling the sample must be less than -0.5 to produce black. For Bilinear sampling
samples between -1 and 0 must linearly interpolate between black and the edge pixel.

Since translate only reads pixels inside the buffer, it is safe to treat Clip as Extend. IMHO the actual bug is in COM_MemoryBuffer. wrap_pixel() must treat Clip as Extend, and code rearranged so calls to it are done after the clipping tests. For Nearest sampling the sample must be less than -0.5 to produce black. For Bilinear sampling samples between -1 and 0 must linearly interpolate between black and the edge pixel.
Bill-Spitzak requested review from Omar Emara 2024-07-17 22:32:57 +02:00
Bill-Spitzak changed title from Fix #1243549: Prevent rounding errors from introducing black pixels in Translate to Fix #124842: Prevent rounding errors from introducing black pixels in Translate 2024-07-17 22:34:19 +02:00
Bill-Spitzak force-pushed translate from eb690e0b53 to 3a9b68e034 2024-07-17 22:35:08 +02:00 Compare
Iliya Katushenock reviewed 2024-07-17 23:31:55 +02:00
source/blender/compositor/operations/COM_TranslateOperation.cc Outdated
@ -116,1 +116,4 @@
MemoryBufferExtend extend_x = x_extend_mode_;
if (extend_x == MemoryBufferExtend::Clip)
extend_x = MemoryBufferExtend::Extend;
Iliya Katushenock commented 2024-07-17 23:31:55 +02:00
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https://developer.blender.org/docs/handbook/guidelines/c_cpp/#always-use-braces

https://developer.blender.org/docs/handbook/guidelines/c_cpp/#always-use-braces
Bill-Spitzak force-pushed translate from 3a9b68e034 to 6280f0f724 2024-07-17 23:48:58 +02:00 Compare
Omar Emara commented 2024-07-18 09:09:00 +02:00
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This is not an acceptable workaround, because if wrapping is enabled, we will still get the transparent pixels.

This is not an acceptable workaround, because if wrapping is enabled, we will still get the transparent pixels.
Bill-Spitzak commented 2024-07-19 00:07:00 +02:00
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It does not change the extend if wrapping is enabled.

However I think this does not work for non-integer translations. Going to test this now.

In my opinion the correct fix is to fix the CPU compositor sampling code. There is just some off-by-½ errors. Going to see if I can fix that instead.

It does not change the extend if wrapping is enabled. However I think this does not work for non-integer translations. Going to test this now. In my opinion the correct fix is to fix the CPU compositor sampling code. There is just some off-by-½ errors. Going to see if I can fix that instead.
Bill-Spitzak commented 2024-07-19 00:26:27 +02:00
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This does not work for non-integer translations. Cancelling this pull request.

This does not work for non-integer translations. Cancelling this pull request.
Bill-Spitzak closed this pull request 2024-07-19 00:26:30 +02:00
Bill-Spitzak deleted branch translate 2024-07-19 00:27:12 +02:00

Pull request closed

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