Win32: Clear to black in WM_PAINT for transparent framebuffer windows#2815
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jeweg wants to merge 1 commit into
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Win32: Clear to black in WM_PAINT for transparent framebuffer windows#2815jeweg wants to merge 1 commit into
jeweg wants to merge 1 commit into
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The DWM redirection surface may contain undefined alpha values, causing the window to composite incorrectly. PatBlt with BLACKNESS clears both RGB and alpha to zero.
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For more background, I also explore the approaches for window transparency on Windows in this repository. This particular fix for GLFW uses what I show in |
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I can confirm this PR fixes the transparency issue I was having on NVIDIA RTX A4000 in DXGI swapchain mode. |
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The DWM redirection surface may contain undefined alpha values, causing the window to composite incorrectly. PatBlt with BLACKNESS clears both RGB and alpha to zero.
Repro for the issue: https://github.com/jeweg/glfw_repro1