Branch: refs/heads/main
Home: https://github.com/WebKit/WebKit
Commit: c26d9ad7d08d34a9c2d515fbe6781ae94bf3565f
https://github.com/WebKit/WebKit/commit/c26d9ad7d08d34a9c2d515fbe6781ae94bf3565f
Author: Matt Woodrow <[email protected]>
Date: 2023-05-11 (Thu, 11 May 2023)
Changed paths:
M Source/WebKit/Shared/RemoteLayerTree/RemoteLayerBackingStore.h
M Source/WebKit/Shared/RemoteLayerTree/RemoteLayerBackingStore.mm
Log Message:
-----------
RemoteLayerBackingStore copies unnecessary pixels from back buffer to front
buffer.
https://bugs.webkit.org/show_bug.cgi?id=256621
<rdar://109179068>
Reviewed by Simon Fraser.
If the new front buffer is the old back buffer, then we only need to copy the
area of pixels that we painted
last time in order to make it match the new back buffer. Take area, subtract
the pixels we're going to overwrite
for this update, and only copy that area.
Uses IntRects as a pessimistic superset of the required area, rather than
Regions, to ensure we don't spend extra time
clipping (which could potentially take longer than the saved time from smaller
copies).
Also detects when we have a newly allocated buffer, which are cleared during
allocation, and avoids clearing them a
second time.
* Source/WebKit/Shared/RemoteLayerTree/RemoteLayerBackingStore.h:
* Source/WebKit/Shared/RemoteLayerTree/RemoteLayerBackingStore.mm:
(WebKit::RemoteLayerBackingStore::applySwappedBuffers):
(WebKit::RemoteLayerBackingStore::ensureFrontBuffer):
(WebKit::RemoteLayerBackingStore::drawInContext):
Canonical link: https://commits.webkit.org/263994@main
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