Adjust tile coverage with margin tiles, and tidy up the indicator
https://bugs.webkit.org/show_bug.cgi?id=152742
Reviewed by Beth Dakin.
Source/WebCore:
The tile coverage rect was unfeasibly large when margin tiles are present, and
could be bigger than the layer itself, making the indicator look odd.
Fix by improving the logic in TileController::adjustTileCoverageRect(): this
now first extends the visible rect for scrolling, and then constrains it
within the bounds with margin padding. It also unites with the passed-in
coverageRect, ensuring that we don't lose information about overhang for
margin tile coverage.
Second, update the tiled scrolling indicator when the visible rect changes,
and coalesce the map updates on a timer.
* platform/graphics/TiledBacking.h:
* platform/graphics/ca/GraphicsLayerCA.cpp:
(WebCore::GraphicsLayerCA::adjustCoverageRect):
* platform/graphics/ca/TileController.cpp:
(WebCore::TileController::setVisibleRect):
(WebCore::TileController::setTiledScrollingIndicatorPosition):
(WebCore::expandRectWithinRect):
(WebCore::TileController::adjustTileCoverageRect):
(WebCore::TileController::updateTileCoverageMap):
(WebCore::TileController::computeTileCoverageRect): Deleted.
* platform/graphics/ca/TileController.h:
* platform/graphics/ca/TileCoverageMap.cpp:
(WebCore::TileCoverageMap::TileCoverageMap):
(WebCore::TileCoverageMap::setNeedsUpdate):
(WebCore::TileCoverageMap::updateTimerFired):
* platform/graphics/ca/TileCoverageMap.h:
LayoutTests:
New baselines. simple-document-with-margin-tiles.html needs to wait for over 0.5s
for the FrameView::enableSpeculativeTilingIfNeeded() timer to fire before
dumping coverage (ouch).
* tiled-drawing/scrolling/fast-scroll-iframe-latched-iframe-expected.txt:
* tiled-drawing/scrolling/fast-scroll-iframe-latched-iframe-with-handler-expected.txt:
* tiled-drawing/scrolling/fast-scroll-iframe-latched-mainframe-expected.txt:
* tiled-drawing/scrolling/fast-scroll-iframe-latched-mainframe-with-handler-expected.txt:
* tiled-drawing/simple-document-with-margin-tiles.html:
git-svn-id: http://svn.webkit.org/repository/webkit/trunk@194607 268f45cc-cd09-0410-ab3c-d52691b4dbfc
14 files changed
