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Don't blend the source surface when blitting

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This commit is contained in:
Cameron Gutman
2026-01-11 12:35:55 -06:00
parent 75adc22d05
commit a8e8efb17b
1 changed files with 5 additions and 0 deletions
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5
app/streaming/video/ffmpeg-renderers/drm.cpp
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@@ -1433,6 +1433,9 @@ void DrmRenderer::blitOverlayToCompositionSurface(Overlay::OverlayType type, SDL
SDL_assert(m_OverlayCompositionSurface);
if (newSurface && overlayRect) {
// Disable blending of the source surface when blitting
SDL_SetSurfaceBlendMode(newSurface, SDL_BLENDMODE_NONE);
// Premultiply alpha in place, so we can blit directly into the composition surface
// without having to read anything (which may be very costly due to UC/WC memory)
SDL_PremultiplyAlpha(newSurface->w, newSurface->h,
@@ -1449,6 +1452,8 @@ void DrmRenderer::blitOverlayToCompositionSurface(Overlay::OverlayType type, SDL
SDL_BlitSurface(newSurface, nullptr, m_OverlayCompositionSurface, overlayRect);
}
else {
SDL_assert(newSurface->format->format == m_OverlayCompositionSurface->format->format);
// Draw the surface row-by-row to ensure we clear the dirty area from the previous surface
// without causing flickering, which would be noticeable if we cleared the whole area first.
for (int y = overlayUnionRect.y; y < overlayUnionRect.y + overlayUnionRect.h; y++) {