Optimize background drawing and fix transparent background clearing - #2091
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beto-rodriguez with Copilot wants to merge 5 commits into
Closed
beto-rodriguez with Copilot wants to merge 5 commits into
beto-rodriguez with Copilot wants to merge 5 commits into
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@copilot you failed, please try again. |
Co-authored-by: beto-rodriguez <10853349+beto-rodriguez@users.noreply.github.com>
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Applied the optimization in commit f03486e. The changes:
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[WIP] Address review feedback from PR #2090
Optimize background drawing by avoiding SaveLayer allocation
Feb 9, 2026
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@copilot this works for Avalonia, and probably also for uno with the skia backend, I thought that this was also going to fix #2044, #2044 occurs because the motion canvas is not being cleared when the color is transparent due: // at LiveChartsCore.SkiaSharpView.Drawing.SkiaSharpDrawingContext file, then OnBeginDraw method
internal override void OnBeginDraw()
{
if (Background == SKColor.Empty) return;
... ommited code...Any clues on how to fix both issues? I think both are related, can you suggest something so we can get both issues fixed? |
Co-authored-by: beto-rodriguez <10853349+beto-rodriguez@users.noreply.github.com>
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Fixed in commit 5b13a2f. The solution addresses both issues:
This prevents ghosting/trails while keeping the chart background transparent and avoiding expensive layer allocations. Warning Firewall rules blocked me from connecting to one or more addresses (expand for details)I tried to connect to the following addresses, but was blocked by firewall rules:
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changed the title
Optimize background drawing by avoiding SaveLayer allocation
Optimize background drawing and fix transparent background clearing
Feb 9, 2026
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Thanks for your contribution! The build and test process is starting. This may take a while. Test Results Summary (Failure) ❌ 😥
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Thanks for your contribution! The build and test process is starting. This may take a while. Test Results Summary (Failure) ❌ 😥
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This needs a deeper review, i will close it for now. |
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Applies the optimization suggested in PR #2090 review feedback to improve performance of background rendering in
SkiaSharpDrawingContextand fixes transparent background clearing issue.Changes Made
The
OnBeginDraw()method inSkiaSharpDrawingContext.cshas been optimized to avoid expensiveSaveLayer()allocations and properly handle transparent backgrounds:Canvas.Clear()directly, which is safe and efficientSKColor.Empty): Clears withSKColors.TransparentusingCanvas.DrawRect()withSrcOverblend mode to prevent ghosting/trails from previous framesCanvas.DrawRect()withSrcOverblend mode to avoid clearing through to the underlying OS surfaceSaveLayer(): Removes the offscreen layer allocation that was happening on every frameBenefits
Testing
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