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Unified Diff: content/browser/renderer_host/compositor_impl_android.cc

Issue 2201483002: Improve transition between opaque and translucent compositor views. (Closed) Base URL: https://chromium.googlesource.com/chromium/src.git@master
Patch Set: removed CompositorSurfaceView Created 4 years, 2 months ago
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Index: content/browser/renderer_host/compositor_impl_android.cc
diff --git a/content/browser/renderer_host/compositor_impl_android.cc b/content/browser/renderer_host/compositor_impl_android.cc
index 718dd4e8f3645317926b702595cb1abd81aaa9ce..ad7b09bb0486cdb7c75c6667c7dcd6e50c330539 100644
--- a/content/browser/renderer_host/compositor_impl_android.cc
+++ b/content/browser/renderer_host/compositor_impl_android.cc
@@ -131,6 +131,12 @@ gpu::gles2::ContextCreationAttribHelper GetCompositorContextAttributes(
// specified
// (IOW check that a <= 0 && rgb > 0 && rgb <= 565) then alpha should be
// -1.
+ // TODO(liberato): This condition is memorized in ComositorView.java, to
+ // avoid using two surfaces temporarily during alpha <-> no alpha
+ // transitions. If these mismatch, then we risk a power regression if the
+ // SurfaceView is not marked as eOpaque (FORMAT_OPAQUE), and we have an
+ // EGL surface with an alpha channel. SurfaceFlinger needs at least one of
+ // those hints to optimize out alpha blending.
attributes.alpha_size = 0;
attributes.red_size = 5;
attributes.green_size = 6;

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