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<dl class="meta">
<dt>Revision</dt> <dd><a href="http://trac.webkit.org/projects/webkit/changeset/184373">184373</a></dd>
<dt>Author</dt> <dd>zalan@apple.com</dd>
<dt>Date</dt> <dd>2015-05-14 22:09:46 -0700 (Thu, 14 May 2015)</dd>
</dl>
<h3>Log Message</h3>
<pre>Images on www.fitstylelife.com jiggle on hover.
https://bugs.webkit.org/show_bug.cgi?id=145020
rdar://problem/20885337
Reviewed by Simon Fraser.
This patch ensures that the clipping layer of a composited content is pixel snapped properly.
Source/WebCore:
Tests: compositing/composited-parent-clipping-layer-on-subpixel-position.html
compositing/parent-clipping-layer-on-subpixel-position.html
* rendering/RenderLayerBacking.cpp:
(WebCore::RenderLayerBacking::updateGeometry):
LayoutTests:
* compositing/composited-parent-clipping-layer-on-subpixel-position-expected.html: Added.
* compositing/composited-parent-clipping-layer-on-subpixel-position.html: Added.
* compositing/parent-clipping-layer-on-subpixel-position-expected.html: Added.
* compositing/parent-clipping-layer-on-subpixel-position.html: Added.</pre>
<h3>Modified Paths</h3>
<ul>
<li><a href="#trunkLayoutTestsChangeLog">trunk/LayoutTests/ChangeLog</a></li>
<li><a href="#trunkSourceWebCoreChangeLog">trunk/Source/WebCore/ChangeLog</a></li>
<li><a href="#trunkSourceWebCorerenderingRenderLayerBackingcpp">trunk/Source/WebCore/rendering/RenderLayerBacking.cpp</a></li>
</ul>
<h3>Added Paths</h3>
<ul>
<li><a href="#trunkLayoutTestscompositingcompositedparentclippinglayeronsubpixelpositionexpectedhtml">trunk/LayoutTests/compositing/composited-parent-clipping-layer-on-subpixel-position-expected.html</a></li>
<li><a href="#trunkLayoutTestscompositingcompositedparentclippinglayeronsubpixelpositionhtml">trunk/LayoutTests/compositing/composited-parent-clipping-layer-on-subpixel-position.html</a></li>
<li><a href="#trunkLayoutTestscompositingparentclippinglayeronsubpixelpositionexpectedhtml">trunk/LayoutTests/compositing/parent-clipping-layer-on-subpixel-position-expected.html</a></li>
<li><a href="#trunkLayoutTestscompositingparentclippinglayeronsubpixelpositionhtml">trunk/LayoutTests/compositing/parent-clipping-layer-on-subpixel-position.html</a></li>
</ul>
</div>
<div id="patch">
<h3>Diff</h3>
<a id="trunkLayoutTestsChangeLog"></a>
<div class="modfile"><h4>Modified: trunk/LayoutTests/ChangeLog (184372 => 184373)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/LayoutTests/ChangeLog 2015-05-15 05:07:22 UTC (rev 184372)
+++ trunk/LayoutTests/ChangeLog 2015-05-15 05:09:46 UTC (rev 184373)
</span><span class="lines">@@ -1,3 +1,18 @@
</span><ins>+2015-05-14 Zalan Bujtas <zalan@apple.com>
+
+ Images on www.fitstylelife.com jiggle on hover.
+ https://bugs.webkit.org/show_bug.cgi?id=145020
+ rdar://problem/20885337
+
+ Reviewed by Simon Fraser.
+
+ This patch ensures that the clipping layer of a composited content is pixel snapped properly.
+
+ * compositing/composited-parent-clipping-layer-on-subpixel-position-expected.html: Added.
+ * compositing/composited-parent-clipping-layer-on-subpixel-position.html: Added.
+ * compositing/parent-clipping-layer-on-subpixel-position-expected.html: Added.
+ * compositing/parent-clipping-layer-on-subpixel-position.html: Added.
+
</ins><span class="cx"> 2015-05-14 Simon Fraser <simon.fraser@apple.com>
</span><span class="cx">
</span><span class="cx"> REGRESSION (r183794): Garbage tiles when body background switches to fixed
</span></span></pre></div>
<a id="trunkLayoutTestscompositingcompositedparentclippinglayeronsubpixelpositionexpectedhtml"></a>
<div class="addfile"><h4>Added: trunk/LayoutTests/compositing/composited-parent-clipping-layer-on-subpixel-position-expected.html (0 => 184373)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/LayoutTests/compositing/composited-parent-clipping-layer-on-subpixel-position-expected.html (rev 0)
+++ trunk/LayoutTests/compositing/composited-parent-clipping-layer-on-subpixel-position-expected.html 2015-05-15 05:09:46 UTC (rev 184373)
</span><span class="lines">@@ -0,0 +1,45 @@
</span><ins>+<!DOCTYPE html>
+<html>
+<head>
+<title>This tests that when the composited parent container enforces clipping and it is on a subpixel position, we snap composited child content properly.</title>
+<style>
+ .container {
+ width: 15px;
+ height: 15px;
+ position: absolute;
+ -webkit-transform: translateZ(0);
+ }
+
+ .inner {
+ width: 10px;
+ height: 10px;
+ border: 1px solid red;
+ -webkit-transform: translateZ(0);
+ }
+</style>
+</head>
+<body>
+</div>
+<script>
+ var body = document.body;
+ var x = 0;
+ var y = 0;
+ for (i = 0; i < 20; ++i) {
+ y = 0;
+ for (j = 0; j < 20; ++j) {
+ var container = document.createElement("div");
+ container.style.top = 15 * i + y + "px";
+ container.style.left = 15 * j + x + "px";
+ container.className = "container";
+ body.appendChild(container);
+
+ var inner = document.createElement("div");
+ inner.className = "inner";
+ container.appendChild(inner);
+ y += 0.1;
+ }
+ x += 0.1;
+ }
+</script>
+</body>
+</html>
</ins></span></pre></div>
<a id="trunkLayoutTestscompositingcompositedparentclippinglayeronsubpixelpositionhtml"></a>
<div class="addfile"><h4>Added: trunk/LayoutTests/compositing/composited-parent-clipping-layer-on-subpixel-position.html (0 => 184373)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/LayoutTests/compositing/composited-parent-clipping-layer-on-subpixel-position.html (rev 0)
+++ trunk/LayoutTests/compositing/composited-parent-clipping-layer-on-subpixel-position.html 2015-05-15 05:09:46 UTC (rev 184373)
</span><span class="lines">@@ -0,0 +1,46 @@
</span><ins>+<!DOCTYPE html>
+<html>
+<head>
+<title>This tests that when the composited parent container enforces clipping and it is on a subpixel position, we snap child content properly.</title>
+<style>
+ .container {
+ width: 15px;
+ height: 15px;
+ position: absolute;
+ overflow: hidden;
+ -webkit-transform: translateZ(0);
+ }
+
+ .inner {
+ width: 10px;
+ height: 10px;
+ border: 1px solid red;
+ -webkit-transform: translateZ(0);
+ }
+</style>
+</head>
+<body>
+</div>
+<script>
+ var body = document.body;
+ var x = 0;
+ var y = 0;
+ for (i = 0; i < 20; ++i) {
+ y = 0;
+ for (j = 0; j < 20; ++j) {
+ var container = document.createElement("div");
+ container.style.top = 15 * i + y + "px";
+ container.style.left = 15 * j + x + "px";
+ container.className = "container";
+ body.appendChild(container);
+
+ var inner = document.createElement("div");
+ inner.className = "inner";
+ container.appendChild(inner);
+ y += 0.1;
+ }
+ x += 0.1;
+ }
+</script>
+</body>
+</html>
</ins></span></pre></div>
<a id="trunkLayoutTestscompositingparentclippinglayeronsubpixelpositionexpectedhtml"></a>
<div class="addfile"><h4>Added: trunk/LayoutTests/compositing/parent-clipping-layer-on-subpixel-position-expected.html (0 => 184373)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/LayoutTests/compositing/parent-clipping-layer-on-subpixel-position-expected.html (rev 0)
+++ trunk/LayoutTests/compositing/parent-clipping-layer-on-subpixel-position-expected.html 2015-05-15 05:09:46 UTC (rev 184373)
</span><span class="lines">@@ -0,0 +1,44 @@
</span><ins>+<!DOCTYPE html>
+<html>
+<head>
+<title>This tests that when the parent container enforces clipping and it is on a subpixel position, we snap child content properly.</title>
+<style>
+ .container {
+ width: 15px;
+ height: 15px;
+ position: absolute;
+ }
+
+ .inner {
+ width: 10px;
+ height: 10px;
+ border: 1px solid red;
+ -webkit-transform: translateZ(0);
+ }
+</style>
+</head>
+<body>
+</div>
+<script>
+ var body = document.body;
+ var x = 0;
+ var y = 0;
+ for (i = 0; i < 20; ++i) {
+ y = 0;
+ for (j = 0; j < 20; ++j) {
+ var container = document.createElement("div");
+ container.style.top = 15 * i + y + "px";
+ container.style.left = 15 * j + x + "px";
+ container.className = "container";
+ body.appendChild(container);
+
+ var inner = document.createElement("div");
+ inner.className = "inner";
+ container.appendChild(inner);
+ y += 0.1;
+ }
+ x += 0.1;
+ }
+</script>
+</body>
+</html>
</ins></span></pre></div>
<a id="trunkLayoutTestscompositingparentclippinglayeronsubpixelpositionhtml"></a>
<div class="addfile"><h4>Added: trunk/LayoutTests/compositing/parent-clipping-layer-on-subpixel-position.html (0 => 184373)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/LayoutTests/compositing/parent-clipping-layer-on-subpixel-position.html (rev 0)
+++ trunk/LayoutTests/compositing/parent-clipping-layer-on-subpixel-position.html 2015-05-15 05:09:46 UTC (rev 184373)
</span><span class="lines">@@ -0,0 +1,45 @@
</span><ins>+<!DOCTYPE html>
+<html>
+<head>
+<title>This tests that when the parent container enforces clipping and it is on a subpixel position, we snap child content properly.</title>
+<style>
+ .container {
+ width: 15px;
+ height: 15px;
+ position: absolute;
+ overflow: hidden;
+ }
+
+ .inner {
+ width: 10px;
+ height: 10px;
+ border: 1px solid red;
+ -webkit-transform: translateZ(0);
+ }
+</style>
+</head>
+<body>
+</div>
+<script>
+ var body = document.body;
+ var x = 0;
+ var y = 0;
+ for (i = 0; i < 20; ++i) {
+ y = 0;
+ for (j = 0; j < 20; ++j) {
+ var container = document.createElement("div");
+ container.style.top = 15 * i + y + "px";
+ container.style.left = 15 * j + x + "px";
+ container.className = "container";
+ body.appendChild(container);
+
+ var inner = document.createElement("div");
+ inner.className = "inner";
+ container.appendChild(inner);
+ y += 0.1;
+ }
+ x += 0.1;
+ }
+</script>
+</body>
+</html>
</ins></span></pre></div>
<a id="trunkSourceWebCoreChangeLog"></a>
<div class="modfile"><h4>Modified: trunk/Source/WebCore/ChangeLog (184372 => 184373)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/WebCore/ChangeLog 2015-05-15 05:07:22 UTC (rev 184372)
+++ trunk/Source/WebCore/ChangeLog 2015-05-15 05:09:46 UTC (rev 184373)
</span><span class="lines">@@ -1,3 +1,19 @@
</span><ins>+2015-05-14 Zalan Bujtas <zalan@apple.com>
+
+ Images on www.fitstylelife.com jiggle on hover.
+ https://bugs.webkit.org/show_bug.cgi?id=145020
+ rdar://problem/20885337
+
+ Reviewed by Simon Fraser.
+
+ This patch ensures that the clipping layer of a composited content is pixel snapped properly.
+
+ Tests: compositing/composited-parent-clipping-layer-on-subpixel-position.html
+ compositing/parent-clipping-layer-on-subpixel-position.html
+
+ * rendering/RenderLayerBacking.cpp:
+ (WebCore::RenderLayerBacking::updateGeometry):
+
</ins><span class="cx"> 2015-05-14 Chris Dumez <cdumez@apple.com>
</span><span class="cx">
</span><span class="cx"> Have DOMWindow::createWindow() take references to frames
</span></span></pre></div>
<a id="trunkSourceWebCorerenderingRenderLayerBackingcpp"></a>
<div class="modfile"><h4>Modified: trunk/Source/WebCore/rendering/RenderLayerBacking.cpp (184372 => 184373)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/WebCore/rendering/RenderLayerBacking.cpp 2015-05-15 05:07:22 UTC (rev 184372)
+++ trunk/Source/WebCore/rendering/RenderLayerBacking.cpp 2015-05-15 05:09:46 UTC (rev 184373)
</span><span class="lines">@@ -786,7 +786,8 @@
</span><span class="cx"> RenderLayer::ClipRectsContext clipRectsContext(compAncestor, TemporaryClipRects, IgnoreOverlayScrollbarSize, shouldRespectOverflowClip);
</span><span class="cx"> LayoutRect parentClipRect = m_owningLayer.backgroundClipRect(clipRectsContext).rect(); // FIXME: Incorrect for CSS regions.
</span><span class="cx"> ASSERT(!parentClipRect.isInfinite());
</span><del>- m_ancestorClippingLayer->setPosition(FloatPoint(parentClipRect.location() - graphicsLayerParentLocation));
</del><ins>+ FloatPoint enclosingClippingLayerPosition = floorPointToDevicePixels(LayoutPoint(parentClipRect.location() - graphicsLayerParentLocation), deviceScaleFactor);
+ m_ancestorClippingLayer->setPosition(enclosingClippingLayerPosition);
</ins><span class="cx"> m_ancestorClippingLayer->setSize(parentClipRect.size());
</span><span class="cx">
</span><span class="cx"> // backgroundRect is relative to compAncestor, so subtract deltaX/deltaY to get back to local coords.
</span></span></pre>
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