Attachment 356448 Details for Bug 192320 – Patch

[patch] Patch

bug-192320-20181203191850.patch (text/plain), 7.05 KB, created by Simon Fraser (smfr) on 2018-12-03 19:18:50 PST

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Creator: Simon Fraser (smfr)

Created: 2018-12-03 19:18:50 PST

Size: 7.05 KB

patch

obsolete

>Subversion Revision: 238817
>diff --git a/Source/WebCore/ChangeLog b/Source/WebCore/ChangeLog
>index f4e615dd2bdd5224db937e5d4c47ce9bb468a8b1..00456cf137ed4acecad6db961cd5bbe440baea4e 100644
>--- a/Source/WebCore/ChangeLog
>+++ b/Source/WebCore/ChangeLog
>@@ -1,3 +1,23 @@
>+2018-12-03  Simon Fraser  <simon.fraser@apple.com>
>+
>+        REGRESSION (r238090): position:fixed sidebar on https://www.w3.org/TR/SVG2/coords.html does not stay fixed
>+        https://bugs.webkit.org/show_bug.cgi?id=192320
>+        <rdar://problem/46429833>
>+
>+        Reviewed by NOBODY (OOPS!).
>+        
>+        When we fall into slow scrolling mode (for example, because of background-attachment: fixed),
>+        RenderLayerCompositor::updateCompositingLayers() needs to set the geometry dirty bit on layers
>+        for viewport-constrained objects so we update them.
>+        
>+        This is only necessary for page scrolling; for overflow scrolls, updateLayerPositions() already
>+        does enough dirtying that fixed layers nested inside scrollers get updated.
>+
>+        Test: compositing/fixed-with-main-thread-scrolling.html
>+
>+        * rendering/RenderLayerCompositor.cpp:
>+        (WebCore::RenderLayerCompositor::updateCompositingLayers):
>+
> 2018-12-03  Simon Fraser  <simon.fraser@apple.com>
> 
>         FrameView's ViewportConstrainedObjectSet can contain RenderLayerModelObjects rather than RenderElements
>diff --git a/Source/WebCore/rendering/RenderLayerCompositor.cpp b/Source/WebCore/rendering/RenderLayerCompositor.cpp
>index e01125599fee0a89f6d96adc4168728d0a4725e2..208c656124375303d6f7926d9295fa69014859c6 100644
>--- a/Source/WebCore/rendering/RenderLayerCompositor.cpp
>+++ b/Source/WebCore/rendering/RenderLayerCompositor.cpp
>@@ -666,9 +666,20 @@ bool RenderLayerCompositor::updateCompositingLayers(CompositingUpdateType update
>     if (!m_compositing && (m_forceCompositingMode || (isMainFrameCompositor() && page().pageOverlayController().overlayCount())))
>         enableCompositingMode(true);
> 
>+    bool isPageScroll = !updateRoot || updateRoot == &rootRenderLayer();
>     updateRoot = &rootRenderLayer();
> 
>     if (updateType == CompositingUpdateType::OnScroll || updateType == CompositingUpdateType::OnCompositedScroll) {
>+        // We only get here if we didn't scroll on the scrolling thread, so this update needs to re-position viewport-constrained layers.
>+        if (m_renderView.settings().acceleratedCompositingForFixedPositionEnabled() && isPageScroll) {
>+            if (auto* viewportConstrainedObjects = m_renderView.frameView().viewportConstrainedObjects()) {
>+                for (auto* renderer : *viewportConstrainedObjects) {
>+                    if (auto* layer = renderer->layer())
>+                        layer->setNeedsCompositingGeometryUpdate();
>+                }
>+            }
>+        }
>+
>         // Scrolling can affect overlap. FIXME: avoid for page scrolling.
>         updateRoot->setDescendantsNeedCompositingRequirementsTraversal();
>     }
>diff --git a/LayoutTests/ChangeLog b/LayoutTests/ChangeLog
>index bbc008dc136cef19c57e722e71efeebd303bc995..b12398d918a1daec9c72ccfc8bc7fe1abdb8f319 100644
>--- a/LayoutTests/ChangeLog
>+++ b/LayoutTests/ChangeLog
>@@ -1,3 +1,14 @@
>+2018-12-03  Simon Fraser  <simon.fraser@apple.com>
>+
>+        REGRESSION (r238090): position:fixed sidebar on https://www.w3.org/TR/SVG2/coords.html does not stay fixed
>+        https://bugs.webkit.org/show_bug.cgi?id=192320
>+        <rdar://problem/46429833>
>+
>+        Reviewed by NOBODY (OOPS!).
>+
>+        * compositing/fixed-with-main-thread-scrolling-expected.html: Added.
>+        * compositing/fixed-with-main-thread-scrolling.html: Added.
>+
> 2018-12-03  Daniel Bates  <dabates@apple.com>
> 
>         [iOS] Do not handle key events that are key commands
>diff --git a/LayoutTests/compositing/fixed-with-main-thread-scrolling-expected.html b/LayoutTests/compositing/fixed-with-main-thread-scrolling-expected.html
>new file mode 100644
>index 0000000000000000000000000000000000000000..6bf7cba6881aee92b34d4f5accfc6fbc235d922f
>--- /dev/null
>+++ b/LayoutTests/compositing/fixed-with-main-thread-scrolling-expected.html
>@@ -0,0 +1,36 @@
>+<!DOCTYPE html>
>+<html>
>+<head>
>+    <style>
>+        body {
>+            height: 6000px;
>+        }
>+        .box {
>+            position: absolute;
>+            top: 5718px;
>+            left: 10px;
>+            width: 200px;
>+            height: 200px;
>+            background-color: green;
>+        }
>+        
>+        .fixed-background {
>+            margin-top: 300px;
>+            height: 200px;
>+            background-image: linear-gradient(white, silver);
>+            background-attachment: fixed;
>+        }
>+    </style>
>+</head>
>+<body>
>+
>+<div class="box"></div>
>+
>+<div class="fixed-background">
>+    I have a fixed background.
>+</div>
>+<script>
>+    window.scrollTo(0, 6000);
>+</script>
>+</body>
>+</html>
>diff --git a/LayoutTests/compositing/fixed-with-main-thread-scrolling.html b/LayoutTests/compositing/fixed-with-main-thread-scrolling.html
>new file mode 100644
>index 0000000000000000000000000000000000000000..951660340f077b7d35fbc751169487669e6a2291
>--- /dev/null
>+++ b/LayoutTests/compositing/fixed-with-main-thread-scrolling.html
>@@ -0,0 +1,60 @@
>+<!DOCTYPE html>
>+<html>
>+<head>
>+    <style>
>+        body {
>+            height: 6000px;
>+        }
>+        .box {
>+            position: fixed;
>+            top: 10px;
>+            left: 10px;
>+            width: 200px;
>+            height: 200px;
>+            background-color: green;
>+        }
>+        
>+        .fixed-background {
>+            margin-top: 300px;
>+            height: 200px;
>+            background-image: linear-gradient(white, silver);
>+            background-attachment: fixed;
>+        }
>+    </style>
>+    <script>
>+        if (window.testRunner) {
>+            testRunner.waitUntilDone();
>+        }
>+
>+        function scrollTest()
>+        {
>+            eventSender.mouseMoveTo(20, 20);
>+            eventSender.mouseScrollByWithWheelAndMomentumPhases(0, -1, "began", "none");
>+            eventSender.mouseScrollByWithWheelAndMomentumPhases(0, -100, "changed", "none");
>+            eventSender.mouseScrollByWithWheelAndMomentumPhases(0, -100, "changed", "none");
>+            eventSender.mouseScrollByWithWheelAndMomentumPhases(0, -1, "changed", "none");
>+            eventSender.mouseScrollByWithWheelAndMomentumPhases(0, 0, "ended", "none");
>+            eventSender.mouseScrollByWithWheelAndMomentumPhases(0, -100, "none", "begin");
>+            eventSender.mouseScrollByWithWheelAndMomentumPhases(0, -100, "none", "continue");
>+            eventSender.mouseScrollByWithWheelAndMomentumPhases(0, -100, "none", "continue");
>+            eventSender.mouseScrollByWithWheelAndMomentumPhases(0, -100, "none", "continue");
>+            eventSender.mouseScrollByWithWheelAndMomentumPhases(0, 0, "none", "end");
>+            testRunner.notifyDone();
>+        }
>+
>+        window.addEventListener('load', () => {
>+            setTimeout(() => {
>+                scrollTest();
>+            }, 0)
>+        }, false);
>+    </script>
>+</head>
>+<body>
>+
>+<div class="box"></div>
>+
>+<div class="fixed-background">
>+    I have a fixed background.
>+</div>
>+</body>
>+</html>

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Attachments on bug 192320: 356443 | 356448