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<div id="msg">
<dl class="meta">
<dt>Revision</dt> <dd><a href="http://trac.webkit.org/projects/webkit/changeset/245571">245571</a></dd>
<dt>Author</dt> <dd>kocsen_chung@apple.com</dd>
<dt>Date</dt> <dd>2019-05-21 10:30:00 -0700 (Tue, 21 May 2019)</dd>
</dl>

<h3>Log Message</h3>
<pre>Cherry-pick <a href="http://trac.webkit.org/projects/webkit/changeset/245208">r245208</a>. rdar://problem/50865946

    Layer bounds are incorrect for sharing layers that paint with transforms
    https://bugs.webkit.org/show_bug.cgi?id=197768
    <rdar://problem/50695493>

    Reviewed by Zalan Bujtas.

    Source/WebCore:

    We don't need to traverse shared layers if the backing-provider has overflow clip,
    because we know they are containing-block descendants and therefore clipped.

    Note tha the CSS "clip" property doesn't guarantee this, because the clip rect
    can be larger than the element, so in that case we just traverse shared layers.

    Tests: compositing/shared-backing/sharing-bounds-clip.html
           compositing/shared-backing/sharing-bounds-non-clipping-shared-layer.html
           compositing/shared-backing/sharing-bounds-transformed-sharing-layer.html
           compositing/shared-backing/sharing-bounds.html

    * rendering/RenderLayerBacking.cpp:
    (WebCore::RenderLayerBacking::updateCompositedBounds):

    LayoutTests:

    Tests for backing-shared layer bounds in various configurations.

    * compositing/shared-backing/sharing-bounds-clip-expected.txt: Added.
    * compositing/shared-backing/sharing-bounds-clip.html: Added.
    * compositing/shared-backing/sharing-bounds-expected.txt: Added.
    * compositing/shared-backing/sharing-bounds-non-clipping-shared-layer-expected.txt: Added.
    * compositing/shared-backing/sharing-bounds-non-clipping-shared-layer.html: Added.
    * compositing/shared-backing/sharing-bounds-transformed-sharing-layer-expected.txt: Added.
    * compositing/shared-backing/sharing-bounds-transformed-sharing-layer.html: Added.
    * compositing/shared-backing/sharing-bounds.html: Added.

    git-svn-id: https://svn.webkit.org/repository/webkit/trunk@245208 268f45cc-cd09-0410-ab3c-d52691b4dbfc</pre>

<h3>Modified Paths</h3>
<ul>
<li><a href="#branchessafari60812420branchLayoutTestsChangeLog">branches/safari-608.1.24.20-branch/LayoutTests/ChangeLog</a></li>
<li><a href="#branchessafari60812420branchSourceWebCoreChangeLog">branches/safari-608.1.24.20-branch/Source/WebCore/ChangeLog</a></li>
<li><a href="#branchessafari60812420branchSourceWebCorerenderingRenderLayerBackingcpp">branches/safari-608.1.24.20-branch/Source/WebCore/rendering/RenderLayerBacking.cpp</a></li>
</ul>

<h3>Added Paths</h3>
<ul>
<li><a href="#branchessafari60812420branchLayoutTestscompositingsharedbackingsharingboundsclipexpectedtxt">branches/safari-608.1.24.20-branch/LayoutTests/compositing/shared-backing/sharing-bounds-clip-expected.txt</a></li>
<li><a href="#branchessafari60812420branchLayoutTestscompositingsharedbackingsharingboundscliphtml">branches/safari-608.1.24.20-branch/LayoutTests/compositing/shared-backing/sharing-bounds-clip.html</a></li>
<li><a href="#branchessafari60812420branchLayoutTestscompositingsharedbackingsharingboundsexpectedtxt">branches/safari-608.1.24.20-branch/LayoutTests/compositing/shared-backing/sharing-bounds-expected.txt</a></li>
<li><a href="#branchessafari60812420branchLayoutTestscompositingsharedbackingsharingboundsnonclippingsharedlayerexpectedtxt">branches/safari-608.1.24.20-branch/LayoutTests/compositing/shared-backing/sharing-bounds-non-clipping-shared-layer-expected.txt</a></li>
<li><a href="#branchessafari60812420branchLayoutTestscompositingsharedbackingsharingboundsnonclippingsharedlayerhtml">branches/safari-608.1.24.20-branch/LayoutTests/compositing/shared-backing/sharing-bounds-non-clipping-shared-layer.html</a></li>
<li><a href="#branchessafari60812420branchLayoutTestscompositingsharedbackingsharingboundstransformedsharinglayerexpectedtxt">branches/safari-608.1.24.20-branch/LayoutTests/compositing/shared-backing/sharing-bounds-transformed-sharing-layer-expected.txt</a></li>
<li><a href="#branchessafari60812420branchLayoutTestscompositingsharedbackingsharingboundstransformedsharinglayerhtml">branches/safari-608.1.24.20-branch/LayoutTests/compositing/shared-backing/sharing-bounds-transformed-sharing-layer.html</a></li>
<li><a href="#branchessafari60812420branchLayoutTestscompositingsharedbackingsharingboundshtml">branches/safari-608.1.24.20-branch/LayoutTests/compositing/shared-backing/sharing-bounds.html</a></li>
</ul>

</div>
<div id="patch">
<h3>Diff</h3>
<a id="branchessafari60812420branchLayoutTestsChangeLog"></a>
<div class="modfile"><h4>Modified: branches/safari-608.1.24.20-branch/LayoutTests/ChangeLog (245570 => 245571)</h4>
<pre class="diff"><span>
<span class="info">--- branches/safari-608.1.24.20-branch/LayoutTests/ChangeLog 2019-05-21 17:29:54 UTC (rev 245570)
+++ branches/safari-608.1.24.20-branch/LayoutTests/ChangeLog    2019-05-21 17:30:00 UTC (rev 245571)
</span><span class="lines">@@ -1,5 +1,66 @@
</span><span class="cx"> 2019-05-21  Kocsen Chung  <kocsen_chung@apple.com>
</span><span class="cx"> 
</span><ins>+        Cherry-pick r245208. rdar://problem/50865946
+
+    Layer bounds are incorrect for sharing layers that paint with transforms
+    https://bugs.webkit.org/show_bug.cgi?id=197768
+    <rdar://problem/50695493>
+    
+    Reviewed by Zalan Bujtas.
+    
+    Source/WebCore:
+    
+    We don't need to traverse shared layers if the backing-provider has overflow clip,
+    because we know they are containing-block descendants and therefore clipped.
+    
+    Note tha the CSS "clip" property doesn't guarantee this, because the clip rect
+    can be larger than the element, so in that case we just traverse shared layers.
+    
+    Tests: compositing/shared-backing/sharing-bounds-clip.html
+           compositing/shared-backing/sharing-bounds-non-clipping-shared-layer.html
+           compositing/shared-backing/sharing-bounds-transformed-sharing-layer.html
+           compositing/shared-backing/sharing-bounds.html
+    
+    * rendering/RenderLayerBacking.cpp:
+    (WebCore::RenderLayerBacking::updateCompositedBounds):
+    
+    LayoutTests:
+    
+    Tests for backing-shared layer bounds in various configurations.
+    
+    * compositing/shared-backing/sharing-bounds-clip-expected.txt: Added.
+    * compositing/shared-backing/sharing-bounds-clip.html: Added.
+    * compositing/shared-backing/sharing-bounds-expected.txt: Added.
+    * compositing/shared-backing/sharing-bounds-non-clipping-shared-layer-expected.txt: Added.
+    * compositing/shared-backing/sharing-bounds-non-clipping-shared-layer.html: Added.
+    * compositing/shared-backing/sharing-bounds-transformed-sharing-layer-expected.txt: Added.
+    * compositing/shared-backing/sharing-bounds-transformed-sharing-layer.html: Added.
+    * compositing/shared-backing/sharing-bounds.html: Added.
+    
+    
+    git-svn-id: https://svn.webkit.org/repository/webkit/trunk@245208 268f45cc-cd09-0410-ab3c-d52691b4dbfc
+
+    2019-05-11  Simon Fraser  <simon.fraser@apple.com>
+
+            Layer bounds are incorrect for sharing layers that paint with transforms
+            https://bugs.webkit.org/show_bug.cgi?id=197768
+            <rdar://problem/50695493>
+
+            Reviewed by Zalan Bujtas.
+
+            Tests for backing-shared layer bounds in various configurations.
+
+            * compositing/shared-backing/sharing-bounds-clip-expected.txt: Added.
+            * compositing/shared-backing/sharing-bounds-clip.html: Added.
+            * compositing/shared-backing/sharing-bounds-expected.txt: Added.
+            * compositing/shared-backing/sharing-bounds-non-clipping-shared-layer-expected.txt: Added.
+            * compositing/shared-backing/sharing-bounds-non-clipping-shared-layer.html: Added.
+            * compositing/shared-backing/sharing-bounds-transformed-sharing-layer-expected.txt: Added.
+            * compositing/shared-backing/sharing-bounds-transformed-sharing-layer.html: Added.
+            * compositing/shared-backing/sharing-bounds.html: Added.
+
+2019-05-21  Kocsen Chung  <kocsen_chung@apple.com>
+
</ins><span class="cx">         Cherry-pick r245207. rdar://problem/50865946
</span><span class="cx"> 
</span><span class="cx">     Translucent gradient rendering bug due to will-change transform
</span></span></pre></div>
<a id="branchessafari60812420branchLayoutTestscompositingsharedbackingsharingboundsclipexpectedtxt"></a>
<div class="addfile"><h4>Added: branches/safari-608.1.24.20-branch/LayoutTests/compositing/shared-backing/sharing-bounds-clip-expected.txt (0 => 245571)</h4>
<pre class="diff"><span>
<span class="info">--- branches/safari-608.1.24.20-branch/LayoutTests/compositing/shared-backing/sharing-bounds-clip-expected.txt                               (rev 0)
+++ branches/safari-608.1.24.20-branch/LayoutTests/compositing/shared-backing/sharing-bounds-clip-expected.txt  2019-05-21 17:30:00 UTC (rev 245571)
</span><span class="lines">@@ -0,0 +1,23 @@
</span><ins>+(GraphicsLayer
+  (anchor 0.00 0.00)
+  (bounds 800.00 600.00)
+  (children 1
+    (GraphicsLayer
+      (bounds 800.00 600.00)
+      (contentsOpaque 1)
+      (children 2
+        (GraphicsLayer
+          (position 8.00 8.00)
+          (bounds 50.00 50.00)
+          (contentsOpaque 1)
+        )
+        (GraphicsLayer
+          (position 30.00 30.00)
+          (bounds 500.00 302.00)
+          (drawsContent 1)
+        )
+      )
+    )
+  )
+)
+
</ins></span></pre></div>
<a id="branchessafari60812420branchLayoutTestscompositingsharedbackingsharingboundscliphtml"></a>
<div class="addfile"><h4>Added: branches/safari-608.1.24.20-branch/LayoutTests/compositing/shared-backing/sharing-bounds-clip.html (0 => 245571)</h4>
<pre class="diff"><span>
<span class="info">--- branches/safari-608.1.24.20-branch/LayoutTests/compositing/shared-backing/sharing-bounds-clip.html                               (rev 0)
+++ branches/safari-608.1.24.20-branch/LayoutTests/compositing/shared-backing/sharing-bounds-clip.html  2019-05-21 17:30:00 UTC (rev 245571)
</span><span class="lines">@@ -0,0 +1,63 @@
</span><ins>+<!DOCTYPE html>
+<html>
+<head>
+    <title>Tests the backing provider layer bounds with a transformed sharing layer</title>
+    <style>
+        .relative {
+            position: absolute;
+            top: 20px;
+            left: 20px;
+            height: 300px;
+            width: 300px;
+            margin: 10px;
+            border: 1px solid black;
+            background-color: silver;
+            clip: rect(10px, 500px, 300px, 10px); /* larger than the bounds */
+        }
+        
+        .sharing {
+                       position: relative;
+                       top: 50px;
+                       left: 50px;
+            width: 200px;
+            height: 200px;
+            background-color: green;
+        }
+        
+        .inner {
+            position: absolute;
+            left: 200px;
+            top: 200px;
+            width: 100px;
+            height: 100px;
+            background-color: blue;
+        }
+
+        .trigger {
+            transform: translateZ(0);
+            width: 50px;
+            height: 50px;
+            background-color: silver;
+        }
+    </style>
+    <script>
+        if (window.testRunner)
+            testRunner.dumpAsText();
+
+        window.addEventListener('load', () => {
+            if (window.internals)
+                document.getElementById('layers').textContent = internals.layerTreeAsText(document);
+        }, false);
+    </script>
+</head>
+<body>
+    <div class="trigger"></div>
+    <div class="relative">
+        <div class="sharing">
+            <div class="inner">
+            </div>
+        </div>
+    </div>
+<pre id="layers"></pre>
+</body>
+</html>
</ins></span></pre></div>
<a id="branchessafari60812420branchLayoutTestscompositingsharedbackingsharingboundsexpectedtxt"></a>
<div class="addfile"><h4>Added: branches/safari-608.1.24.20-branch/LayoutTests/compositing/shared-backing/sharing-bounds-expected.txt (0 => 245571)</h4>
<pre class="diff"><span>
<span class="info">--- branches/safari-608.1.24.20-branch/LayoutTests/compositing/shared-backing/sharing-bounds-expected.txt                            (rev 0)
+++ branches/safari-608.1.24.20-branch/LayoutTests/compositing/shared-backing/sharing-bounds-expected.txt       2019-05-21 17:30:00 UTC (rev 245571)
</span><span class="lines">@@ -0,0 +1,23 @@
</span><ins>+(GraphicsLayer
+  (anchor 0.00 0.00)
+  (bounds 800.00 600.00)
+  (children 1
+    (GraphicsLayer
+      (bounds 800.00 600.00)
+      (contentsOpaque 1)
+      (children 2
+        (GraphicsLayer
+          (position 8.00 8.00)
+          (bounds 50.00 50.00)
+          (contentsOpaque 1)
+        )
+        (GraphicsLayer
+          (position 30.00 30.00)
+          (bounds 302.00 302.00)
+          (drawsContent 1)
+        )
+      )
+    )
+  )
+)
+
</ins></span></pre></div>
<a id="branchessafari60812420branchLayoutTestscompositingsharedbackingsharingboundsnonclippingsharedlayerexpectedtxt"></a>
<div class="addfile"><h4>Added: branches/safari-608.1.24.20-branch/LayoutTests/compositing/shared-backing/sharing-bounds-non-clipping-shared-layer-expected.txt (0 => 245571)</h4>
<pre class="diff"><span>
<span class="info">--- branches/safari-608.1.24.20-branch/LayoutTests/compositing/shared-backing/sharing-bounds-non-clipping-shared-layer-expected.txt                          (rev 0)
+++ branches/safari-608.1.24.20-branch/LayoutTests/compositing/shared-backing/sharing-bounds-non-clipping-shared-layer-expected.txt     2019-05-21 17:30:00 UTC (rev 245571)
</span><span class="lines">@@ -0,0 +1,23 @@
</span><ins>+(GraphicsLayer
+  (anchor 0.00 0.00)
+  (bounds 800.00 600.00)
+  (children 1
+    (GraphicsLayer
+      (bounds 800.00 600.00)
+      (contentsOpaque 1)
+      (children 2
+        (GraphicsLayer
+          (position 8.00 8.00)
+          (bounds 50.00 50.00)
+          (contentsOpaque 1)
+        )
+        (GraphicsLayer
+          (position 30.00 30.00)
+          (bounds 501.00 501.00)
+          (drawsContent 1)
+        )
+      )
+    )
+  )
+)
+
</ins></span></pre></div>
<a id="branchessafari60812420branchLayoutTestscompositingsharedbackingsharingboundsnonclippingsharedlayerhtml"></a>
<div class="addfile"><h4>Added: branches/safari-608.1.24.20-branch/LayoutTests/compositing/shared-backing/sharing-bounds-non-clipping-shared-layer.html (0 => 245571)</h4>
<pre class="diff"><span>
<span class="info">--- branches/safari-608.1.24.20-branch/LayoutTests/compositing/shared-backing/sharing-bounds-non-clipping-shared-layer.html                          (rev 0)
+++ branches/safari-608.1.24.20-branch/LayoutTests/compositing/shared-backing/sharing-bounds-non-clipping-shared-layer.html     2019-05-21 17:30:00 UTC (rev 245571)
</span><span class="lines">@@ -0,0 +1,63 @@
</span><ins>+<!DOCTYPE html>
+<html>
+<head>
+    <title>Tests the backing provider layer bounds with a transformed sharing layer</title>
+    <style>
+        .relative {
+            position: absolute;
+            top: 20px;
+            left: 20px;
+            height: 300px;
+            width: 300px;
+            margin: 10px;
+            border: 1px solid black;
+        }
+        
+        .sharing {
+                       position: relative;
+                       top: 50px;
+                       left: 50px;
+            width: 200px;
+            height: 200px;
+            background-color: green;
+            transform: scale(1.5);
+            transform-origin: top left;
+        }
+        
+        .inner {
+            position: absolute;
+            left: 200px;
+            top: 200px;
+            width: 100px;
+            height: 100px;
+            background-color: blue;
+        }
+
+        .trigger {
+            transform: translateZ(0);
+            width: 50px;
+            height: 50px;
+            background-color: silver;
+        }
+    </style>
+    <script>
+        if (window.testRunner)
+            testRunner.dumpAsText();
+
+        window.addEventListener('load', () => {
+            if (window.internals)
+                document.getElementById('layers').textContent = internals.layerTreeAsText(document);
+        }, false);
+    </script>
+</head>
+<body>
+    <div class="trigger"></div>
+    <div class="relative">
+        <div class="sharing">
+            <div class="inner">
+            </div>
+        </div>
+    </div>
+<pre id="layers"></pre>
+</body>
+</html>
</ins></span></pre></div>
<a id="branchessafari60812420branchLayoutTestscompositingsharedbackingsharingboundstransformedsharinglayerexpectedtxt"></a>
<div class="addfile"><h4>Added: branches/safari-608.1.24.20-branch/LayoutTests/compositing/shared-backing/sharing-bounds-transformed-sharing-layer-expected.txt (0 => 245571)</h4>
<pre class="diff"><span>
<span class="info">--- branches/safari-608.1.24.20-branch/LayoutTests/compositing/shared-backing/sharing-bounds-transformed-sharing-layer-expected.txt                          (rev 0)
+++ branches/safari-608.1.24.20-branch/LayoutTests/compositing/shared-backing/sharing-bounds-transformed-sharing-layer-expected.txt     2019-05-21 17:30:00 UTC (rev 245571)
</span><span class="lines">@@ -0,0 +1,23 @@
</span><ins>+(GraphicsLayer
+  (anchor 0.00 0.00)
+  (bounds 800.00 600.00)
+  (children 1
+    (GraphicsLayer
+      (bounds 800.00 600.00)
+      (contentsOpaque 1)
+      (children 2
+        (GraphicsLayer
+          (position 8.00 8.00)
+          (bounds 50.00 50.00)
+          (contentsOpaque 1)
+        )
+        (GraphicsLayer
+          (position 30.00 30.00)
+          (bounds 302.00 302.00)
+          (drawsContent 1)
+        )
+      )
+    )
+  )
+)
+
</ins></span></pre></div>
<a id="branchessafari60812420branchLayoutTestscompositingsharedbackingsharingboundstransformedsharinglayerhtml"></a>
<div class="addfile"><h4>Added: branches/safari-608.1.24.20-branch/LayoutTests/compositing/shared-backing/sharing-bounds-transformed-sharing-layer.html (0 => 245571)</h4>
<pre class="diff"><span>
<span class="info">--- branches/safari-608.1.24.20-branch/LayoutTests/compositing/shared-backing/sharing-bounds-transformed-sharing-layer.html                          (rev 0)
+++ branches/safari-608.1.24.20-branch/LayoutTests/compositing/shared-backing/sharing-bounds-transformed-sharing-layer.html     2019-05-21 17:30:00 UTC (rev 245571)
</span><span class="lines">@@ -0,0 +1,50 @@
</span><ins>+<!DOCTYPE html>
+<html>
+<head>
+    <title>Tests bounds computation for a transformed layer painting into shared backing</title>
+    <style>
+        .clipping {
+            position: absolute;
+            top: 20px;
+            left: 20px;
+            overflow: hidden;
+            height: 300px;
+            width: 300px;
+            margin: 10px;
+            border: 1px solid black;
+        }
+
+        .transformed {
+            width: 400px;
+            height: 100px;
+            background-color: green;
+            transform: scale(2);
+            transform-origin: top left;
+        }
+
+        .trigger {
+            transform: translateZ(0);
+            width: 50px;
+            height: 50px;
+            background-color: silver;
+        }
+    </style>
+    <script>
+        if (window.testRunner)
+            testRunner.dumpAsText();
+
+        window.addEventListener('load', () => {
+            if (window.internals)
+                document.getElementById('layers').textContent = internals.layerTreeAsText(document);
+        }, false);
+    </script>
+</head>
+<body>
+    <div class="trigger"></div>
+    <div class="clipping">
+        <div class="transformed">
+        </div>
+    </div>
+<pre id="layers"></pre>
+</body>
+</html>
</ins></span></pre></div>
<a id="branchessafari60812420branchLayoutTestscompositingsharedbackingsharingboundshtml"></a>
<div class="addfile"><h4>Added: branches/safari-608.1.24.20-branch/LayoutTests/compositing/shared-backing/sharing-bounds.html (0 => 245571)</h4>
<pre class="diff"><span>
<span class="info">--- branches/safari-608.1.24.20-branch/LayoutTests/compositing/shared-backing/sharing-bounds.html                            (rev 0)
+++ branches/safari-608.1.24.20-branch/LayoutTests/compositing/shared-backing/sharing-bounds.html       2019-05-21 17:30:00 UTC (rev 245571)
</span><span class="lines">@@ -0,0 +1,63 @@
</span><ins>+<!DOCTYPE html>
+<html>
+<head>
+    <title>Tests the backing provider layer bounds with a positioned child</title>
+    <style>
+        .clipping {
+            position: absolute;
+            top: 20px;
+            left: 20px;
+            overflow: hidden;
+            height: 300px;
+            width: 300px;
+            margin: 10px;
+            border: 1px solid black;
+        }
+        
+        .sharing {
+                       position: relative;
+                       top: 50px;
+                       left: 50px;
+            width: 200px;
+            height: 200px;
+            background-color: green;
+        }
+        
+        .inner {
+            position: absolute;
+            left: 200px;
+            top: 200px;
+            width: 100px;
+            height: 100px;
+            background-color: blue;
+        }
+
+        .trigger {
+            transform: translateZ(0);
+            width: 50px;
+            height: 50px;
+            background-color: silver;
+        }
+        
+    </style>
+    <script>
+        if (window.testRunner)
+            testRunner.dumpAsText();
+
+        window.addEventListener('load', () => {
+            if (window.internals)
+                document.getElementById('layers').textContent = internals.layerTreeAsText(document);
+        }, false);
+    </script>
+</head>
+<body>
+    <div class="composited trigger"></div>
+    <div class="clipping">
+        <div class="sharing">
+            <div class="inner">
+            </div>
+        </div>
+    </div>
+<pre id="layers"></pre>
+</body>
+</html>
</ins></span></pre></div>
<a id="branchessafari60812420branchSourceWebCoreChangeLog"></a>
<div class="modfile"><h4>Modified: branches/safari-608.1.24.20-branch/Source/WebCore/ChangeLog (245570 => 245571)</h4>
<pre class="diff"><span>
<span class="info">--- branches/safari-608.1.24.20-branch/Source/WebCore/ChangeLog      2019-05-21 17:29:54 UTC (rev 245570)
+++ branches/safari-608.1.24.20-branch/Source/WebCore/ChangeLog 2019-05-21 17:30:00 UTC (rev 245571)
</span><span class="lines">@@ -1,5 +1,69 @@
</span><span class="cx"> 2019-05-21  Kocsen Chung  <kocsen_chung@apple.com>
</span><span class="cx"> 
</span><ins>+        Cherry-pick r245208. rdar://problem/50865946
+
+    Layer bounds are incorrect for sharing layers that paint with transforms
+    https://bugs.webkit.org/show_bug.cgi?id=197768
+    <rdar://problem/50695493>
+    
+    Reviewed by Zalan Bujtas.
+    
+    Source/WebCore:
+    
+    We don't need to traverse shared layers if the backing-provider has overflow clip,
+    because we know they are containing-block descendants and therefore clipped.
+    
+    Note tha the CSS "clip" property doesn't guarantee this, because the clip rect
+    can be larger than the element, so in that case we just traverse shared layers.
+    
+    Tests: compositing/shared-backing/sharing-bounds-clip.html
+           compositing/shared-backing/sharing-bounds-non-clipping-shared-layer.html
+           compositing/shared-backing/sharing-bounds-transformed-sharing-layer.html
+           compositing/shared-backing/sharing-bounds.html
+    
+    * rendering/RenderLayerBacking.cpp:
+    (WebCore::RenderLayerBacking::updateCompositedBounds):
+    
+    LayoutTests:
+    
+    Tests for backing-shared layer bounds in various configurations.
+    
+    * compositing/shared-backing/sharing-bounds-clip-expected.txt: Added.
+    * compositing/shared-backing/sharing-bounds-clip.html: Added.
+    * compositing/shared-backing/sharing-bounds-expected.txt: Added.
+    * compositing/shared-backing/sharing-bounds-non-clipping-shared-layer-expected.txt: Added.
+    * compositing/shared-backing/sharing-bounds-non-clipping-shared-layer.html: Added.
+    * compositing/shared-backing/sharing-bounds-transformed-sharing-layer-expected.txt: Added.
+    * compositing/shared-backing/sharing-bounds-transformed-sharing-layer.html: Added.
+    * compositing/shared-backing/sharing-bounds.html: Added.
+    
+    
+    git-svn-id: https://svn.webkit.org/repository/webkit/trunk@245208 268f45cc-cd09-0410-ab3c-d52691b4dbfc
+
+    2019-05-11  Simon Fraser  <simon.fraser@apple.com>
+
+            Layer bounds are incorrect for sharing layers that paint with transforms
+            https://bugs.webkit.org/show_bug.cgi?id=197768
+            <rdar://problem/50695493>
+
+            Reviewed by Zalan Bujtas.
+
+            We don't need to traverse shared layers if the backing-provider has overflow clip,
+            because we know they are containing-block descendants and therefore clipped.
+
+            Note tha the CSS "clip" property doesn't guarantee this, because the clip rect
+            can be larger than the element, so in that case we just traverse shared layers.
+
+            Tests: compositing/shared-backing/sharing-bounds-clip.html
+                   compositing/shared-backing/sharing-bounds-non-clipping-shared-layer.html
+                   compositing/shared-backing/sharing-bounds-transformed-sharing-layer.html
+                   compositing/shared-backing/sharing-bounds.html
+
+            * rendering/RenderLayerBacking.cpp:
+            (WebCore::RenderLayerBacking::updateCompositedBounds):
+
+2019-05-21  Kocsen Chung  <kocsen_chung@apple.com>
+
</ins><span class="cx">         Cherry-pick r245207. rdar://problem/50865946
</span><span class="cx"> 
</span><span class="cx">     Translucent gradient rendering bug due to will-change transform
</span></span></pre></div>
<a id="branchessafari60812420branchSourceWebCorerenderingRenderLayerBackingcpp"></a>
<div class="modfile"><h4>Modified: branches/safari-608.1.24.20-branch/Source/WebCore/rendering/RenderLayerBacking.cpp (245570 => 245571)</h4>
<pre class="diff"><span>
<span class="info">--- branches/safari-608.1.24.20-branch/Source/WebCore/rendering/RenderLayerBacking.cpp       2019-05-21 17:29:54 UTC (rev 245570)
+++ branches/safari-608.1.24.20-branch/Source/WebCore/rendering/RenderLayerBacking.cpp  2019-05-21 17:30:00 UTC (rev 245571)
</span><span class="lines">@@ -665,12 +665,15 @@
</span><span class="cx">         layerBounds.intersect(clippingBounds);
</span><span class="cx">     }
</span><span class="cx"> 
</span><del>-    for (auto& layerWeakPtr : m_backingSharingLayers) {
-        auto* boundsRootLayer = &m_owningLayer;
-        ASSERT(layerWeakPtr->isDescendantOf(m_owningLayer));
-        auto offset = layerWeakPtr->offsetFromAncestor(&m_owningLayer);
-        auto bounds = layerWeakPtr->calculateLayerBounds(boundsRootLayer, offset, RenderLayer::defaultCalculateLayerBoundsFlags() | RenderLayer::ExcludeHiddenDescendants | RenderLayer::DontConstrainForMask);
-        layerBounds.unite(bounds);
</del><ins>+    // If the backing provider has overflow:clip, we know all sharing layers are affected by the clip because they are containing-block descendants.
+    if (!renderer().hasOverflowClip()) {
+        for (auto& layerWeakPtr : m_backingSharingLayers) {
+            auto* boundsRootLayer = &m_owningLayer;
+            ASSERT(layerWeakPtr->isDescendantOf(m_owningLayer));
+            auto offset = layerWeakPtr->offsetFromAncestor(&m_owningLayer);
+            auto bounds = layerWeakPtr->calculateLayerBounds(boundsRootLayer, offset, RenderLayer::defaultCalculateLayerBoundsFlags() | RenderLayer::ExcludeHiddenDescendants | RenderLayer::DontConstrainForMask);
+            layerBounds.unite(bounds);
+        }
</ins><span class="cx">     }
</span><span class="cx"> 
</span><span class="cx">     // If the element has a transform-origin that has fixed lengths, and the renderer has zero size,
</span></span></pre>
</div>
</div>

</body>
</html>