Attachment 341657 Details for Bug 186091 – patch

[patch] patch

visible-rect-adjustment-2.patch (text/plain), 4.38 KB, created by Antti Koivisto on 2018-05-31 04:43:38 PDT

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Creator: Antti Koivisto

Created: 2018-05-31 04:43:38 PDT

Size: 4.38 KB

patch

obsolete

>Index: Source/WebKit/ChangeLog
>===================================================================
>--- Source/WebKit/ChangeLog	(revision 232290)
>+++ Source/WebKit/ChangeLog	(working copy)
>@@ -1,3 +1,32 @@
>+2018-05-31  Antti Koivisto  <antti@apple.com>
>+
>+        WebKit memory management: Safari jetsams on some websites when zooming and scrolling
>+        https://bugs.webkit.org/show_bug.cgi?id=186091
>+        <rdar://problem/36315010>
>+
>+        Reviewed by NOBODY (OOPS!).
>+
>+        When zooming a page rapidly the visible rect and the page zoom level may get momentarily out of sync.
>+        When this happens we may generate tiles for a much larger area than needed and run out of memory
>+        building the next layer tree transaction. Running out of memory is more likely if the page has lots of
>+        tiled layers in addition to the main content layer.
>+
>+        We already have code for dealing with the scale mismatch for zoom-out case (where this would cause
>+        visibly missing tiles). This patch enables the same exact adjustment for zoom-in case (where the
>+        symptom is creating too many tiles).
>+
>+        * WebProcess/WebPage/ios/WebPageIOS.mm:
>+        (WebKit::adjustExposedRectForNewScale):
>+
>+        Do some renames to make it clear that this can both expand and contract the visible rect.
>+        Bail out if there is nothing to do.
>+
>+        (WebKit::WebPage::updateVisibleContentRects):
>+
>+        Call adjustExposedRectForNewScale directly and unconditionally.
>+
>+        (WebKit::adjustExposedRectForBoundedScale): Deleted.
>+
> 2018-05-29  Tim Horton  <timothy_horton@apple.com>
> 
>         Fix the build
>Index: Source/WebKit/WebProcess/WebPage/ios/WebPageIOS.mm
>===================================================================
>--- Source/WebKit/WebProcess/WebPage/ios/WebPageIOS.mm	(revision 232149)
>+++ Source/WebKit/WebProcess/WebPage/ios/WebPageIOS.mm	(working copy)
>@@ -299,13 +299,15 @@ static FloatPoint relativeCenterAfterCon
> 
> static inline FloatRect adjustExposedRectForNewScale(const FloatRect& exposedRect, double exposedRectScale, double newScale)
> {
>-    double overscaledWidth = exposedRect.width();
>-    double missingHorizonalMargin = exposedRect.width() * exposedRectScale / newScale - overscaledWidth;
>+    if (exposedRectScale == newScale)
>+        return exposedRect;
> 
>-    double overscaledHeight = exposedRect.height();
>-    double missingVerticalMargin = exposedRect.height() * exposedRectScale / newScale - overscaledHeight;
>+    float horizontalChange = exposedRect.width() * exposedRectScale / newScale - exposedRect.width();
>+    float verticalChange = exposedRect.height() * exposedRectScale / newScale - exposedRect.height();
> 
>-    return FloatRect(exposedRect.x() - missingHorizonalMargin / 2, exposedRect.y() - missingVerticalMargin / 2, exposedRect.width() + missingHorizonalMargin, exposedRect.height() + missingVerticalMargin);
>+    auto adjustedRect = exposedRect;
>+    adjustedRect.inflate({ horizontalChange / 2, verticalChange / 2 });
>+    return adjustedRect;
> }
> 
> void WebPage::restorePageState(const HistoryItem& historyItem)
>@@ -2807,14 +2809,6 @@ static inline void adjustVelocityDataFor
>         scaleChangeRate = 0;
> }
> 
>-static inline FloatRect adjustExposedRectForBoundedScale(const FloatRect& exposedRect, double exposedRectScale, double newScale)
>-{
>-    if (exposedRectScale < newScale)
>-        return exposedRect;
>-
>-    return adjustExposedRectForNewScale(exposedRect, exposedRectScale, newScale);
>-}
>-
> std::optional<float> WebPage::scaleFromUIProcess(const VisibleContentRectUpdateInfo& visibleContentRectUpdateInfo) const
> {
>     auto transactionIDForLastScaleSentToUIProcess = downcast<RemoteLayerTreeDrawingArea>(*m_drawingArea).lastCommittedTransactionID();
>@@ -2885,7 +2879,7 @@ void WebPage::updateVisibleContentRects(
> 
>     float scaleToUse = scaleFromUIProcess.value_or(m_page->pageScaleFactor());
>     FloatRect exposedContentRect = visibleContentRectUpdateInfo.exposedContentRect();
>-    FloatRect adjustedExposedContentRect = adjustExposedRectForBoundedScale(exposedContentRect, visibleContentRectUpdateInfo.scale(), scaleToUse);
>+    FloatRect adjustedExposedContentRect = adjustExposedRectForNewScale(exposedContentRect, visibleContentRectUpdateInfo.scale(), scaleToUse);
>     m_drawingArea->setExposedContentRect(adjustedExposedContentRect);
> 
>     IntPoint scrollPosition = roundedIntPoint(visibleContentRectUpdateInfo.unobscuredContentRect().location());

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Attachments on bug 186091: 341572 | 341657 | 341658