Changeset 211387 in webkit

Timestamp:

Jan 30, 2017, 2:51:52 PM (8 years ago)

Author:

Simon Fraser

Message:

[iOS] position:fixed inside touch-scrollable overflow is mispositioned
​https://bugs.webkit.org/show_bug.cgi?id=167604
Source/WebCore:

rdar://problem/29500273

Reviewed by Zalan Bujtas.

For layers inside touch-scrollable overflow, RenderLayerBacking::computeParentGraphicsLayerRect() needs
to account for the offset from the ancestor compositing layer's origin, to handle scrollable elements with
box-shadow, for example.

Also make the compositing log output a little easier to read.

Test: compositing/scrolling/fixed-inside-scroll.html

• rendering/RenderLayerBacking.cpp:

(WebCore::RenderLayerBacking::computeParentGraphicsLayerRect):

• rendering/RenderLayerCompositor.cpp:

(WebCore::RenderLayerCompositor::logLayerInfo):

Source/WebKit2:

rdar://problem/29500273

Reviewed by Zalan Bujtas.

Make sure we tell m_webPageProxy.computeCustomFixedPositionRect() when visual viewports are enabled.

• UIProcess/ios/RemoteScrollingCoordinatorProxyIOS.mm:

(WebKit::RemoteScrollingCoordinatorProxy::customFixedPositionRect):

LayoutTests:

Reviewed by Zalan Bujtas.

• compositing/scrolling/fixed-inside-scroll-expected.html: Added.
• compositing/scrolling/fixed-inside-scroll.html: Added.

Location:

trunk

Files:

• LayoutTests/ChangeLog (modified) (1 diff)
• LayoutTests/compositing/scrolling/fixed-inside-scroll-expected.html (added)
• LayoutTests/compositing/scrolling/fixed-inside-scroll.html (added)
• Source/WebCore/ChangeLog (modified) (1 diff)
• Source/WebCore/rendering/RenderLayerBacking.cpp (modified) (1 diff)
• Source/WebCore/rendering/RenderLayerCompositor.cpp (modified) (1 diff)
• Source/WebKit2/ChangeLog (modified) (1 diff)
• Source/WebKit2/UIProcess/ios/RemoteScrollingCoordinatorProxyIOS.mm (modified) (1 diff)

trunk/LayoutTests/ChangeLog

@@ +1 @@
+2017-01-30  Simon Fraser  <simon.fraser@apple.com>
+
+        [iOS] position:fixed inside touch-scrollable overflow is mispositioned
+        https://bugs.webkit.org/show_bug.cgi?id=167604
+
+        Reviewed by Zalan Bujtas.
+
+        * compositing/scrolling/fixed-inside-scroll-expected.html: Added.
+        * compositing/scrolling/fixed-inside-scroll.html: Added.
+
 2017-01-30  Matt Baker  <mattbaker@apple.com>
 

trunk/Source/WebCore/ChangeLog

@@ +1 @@
+2017-01-30  Simon Fraser  <simon.fraser@apple.com>
+
+        [iOS] position:fixed inside touch-scrollable overflow is mispositioned
+        https://bugs.webkit.org/show_bug.cgi?id=167604
+        rdar://problem/29500273
+
+        Reviewed by Zalan Bujtas.
+        
+        For layers inside touch-scrollable overflow, RenderLayerBacking::computeParentGraphicsLayerRect() needs
+        to account for the offset from the ancestor compositing layer's origin, to handle scrollable elements with
+        box-shadow, for example.
+        
+        Also make the compositing log output a little easier to read.
+
+        Test: compositing/scrolling/fixed-inside-scroll.html
+
+        * rendering/RenderLayerBacking.cpp:
+        (WebCore::RenderLayerBacking::computeParentGraphicsLayerRect):
+        * rendering/RenderLayerCompositor.cpp:
+        (WebCore::RenderLayerCompositor::logLayerInfo):
+
 2017-01-30  Jer Noble  <jer.noble@apple.com>
 

trunk/Source/WebCore/rendering/RenderLayerBacking.cpp

@@ -814 +814 @@
 #if PLATFORM(IOS)
     if (compositedAncestor->hasTouchScrollableOverflow()) {
+        LayoutRect ancestorCompositedBounds = ancestorBackingLayer->compositedBounds();
         auto& renderBox = downcast<RenderBox>(compositedAncestor->renderer());
-        LayoutRect paddingBox(renderBox.borderLeft(), renderBox.borderTop(),
-            renderBox.width() - renderBox.borderLeft() - renderBox.borderRight(),
-            renderBox.height() - renderBox.borderTop() - renderBox.borderBottom());
+        LayoutRect paddingBox(renderBox.borderLeft(), renderBox.borderTop(), renderBox.width() - renderBox.borderLeft() - renderBox.borderRight(), renderBox.height() - renderBox.borderTop() - renderBox.borderBottom());
         ScrollOffset scrollOffset = compositedAncestor->scrollOffset();
-        parentGraphicsLayerRect = LayoutRect((paddingBox.location() - toLayoutSize(scrollOffset)), paddingBox.size());
+        parentGraphicsLayerRect = LayoutRect((paddingBox.location() - toLayoutSize(ancestorCompositedBounds.location()) - toLayoutSize(scrollOffset)), paddingBox.size());
     }
 #else

trunk/Source/WebCore/rendering/RenderLayerCompositor.cpp

@@ -810 +810 @@
     
     StringBuilder logString;
-    logString.append(String::format("%*p (%.6f,%.6f-%.6f,%.6f) %.2fKB", 12 + depth * 2, &layer,
+    logString.append(String::format("%*p (%.3f,%.3f-%.3f,%.3f) %.2fKB", 12 + depth * 2, &layer,
         absoluteBounds.x().toFloat(), absoluteBounds.y().toFloat(), absoluteBounds.maxX().toFloat(), absoluteBounds.maxY().toFloat(),
         backing->backingStoreMemoryEstimate() / 1024));

trunk/Source/WebKit2/ChangeLog

@@ +1 @@
+2017-01-30  Simon Fraser  <simon.fraser@apple.com>
+
+        [iOS] position:fixed inside touch-scrollable overflow is mispositioned
+        https://bugs.webkit.org/show_bug.cgi?id=167604
+        rdar://problem/29500273
+
+        Reviewed by Zalan Bujtas.
+
+        Make sure we tell m_webPageProxy.computeCustomFixedPositionRect() when visual viewports are enabled.
+
+        * UIProcess/ios/RemoteScrollingCoordinatorProxyIOS.mm:
+        (WebKit::RemoteScrollingCoordinatorProxy::customFixedPositionRect):
+
 2017-01-30  Simon Fraser  <simon.fraser@apple.com>
 

trunk/Source/WebKit2/UIProcess/ios/RemoteScrollingCoordinatorProxyIOS.mm

@@ -96 +96 @@
 FloatRect RemoteScrollingCoordinatorProxy::customFixedPositionRect() const
 {
-    return m_webPageProxy.computeCustomFixedPositionRect(m_webPageProxy.unobscuredContentRect(), m_webPageProxy.unobscuredContentRectRespectingInputViewBounds(), m_webPageProxy.customFixedPositionRect(), m_webPageProxy.displayedContentScale());
+    return m_webPageProxy.computeCustomFixedPositionRect(m_webPageProxy.unobscuredContentRect(), m_webPageProxy.unobscuredContentRectRespectingInputViewBounds(), m_webPageProxy.customFixedPositionRect(),
+        m_webPageProxy.displayedContentScale(), WebPageProxy::UnobscuredRectConstraint::Unconstrained, visualViewportEnabled());
 }