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<title>[172456] branches/safari-600.1-branch</title>
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<div id="msg">
<dl class="meta">
<dt>Revision</dt> <dd><a href="http://trac.webkit.org/projects/webkit/changeset/172456">172456</a></dd>
<dt>Author</dt> <dd>lforschler@apple.com</dd>
<dt>Date</dt> <dd>2014-08-12 06:42:15 -0700 (Tue, 12 Aug 2014)</dd>
</dl>
<h3>Log Message</h3>
<pre>Merged <a href="http://trac.webkit.org/projects/webkit/changeset/172373">r172373</a>. <rdar://problem/17952364></pre>
<h3>Modified Paths</h3>
<ul>
<li><a href="#branchessafari6001branchLayoutTestsChangeLog">branches/safari-600.1-branch/LayoutTests/ChangeLog</a></li>
<li><a href="#branchessafari6001branchSourceWebCoreChangeLog">branches/safari-600.1-branch/Source/WebCore/ChangeLog</a></li>
<li><a href="#branchessafari6001branchSourceWebCorerenderingRenderBoxcpp">branches/safari-600.1-branch/Source/WebCore/rendering/RenderBox.cpp</a></li>
</ul>
<h3>Added Paths</h3>
<ul>
<li><a href="#branchessafari6001branchLayoutTestsfastrepainthidpitransformonsubpixelrepaintrectexpectedtxt">branches/safari-600.1-branch/LayoutTests/fast/repaint/hidpi-transform-on-subpixel-repaintrect-expected.txt</a></li>
<li><a href="#branchessafari6001branchLayoutTestsfastrepainthidpitransformonsubpixelrepaintrecthtml">branches/safari-600.1-branch/LayoutTests/fast/repaint/hidpi-transform-on-subpixel-repaintrect.html</a></li>
</ul>
</div>
<div id="patch">
<h3>Diff</h3>
<a id="branchessafari6001branchLayoutTestsChangeLog"></a>
<div class="modfile"><h4>Modified: branches/safari-600.1-branch/LayoutTests/ChangeLog (172455 => 172456)</h4>
<pre class="diff"><span>
<span class="info">--- branches/safari-600.1-branch/LayoutTests/ChangeLog 2014-08-12 13:40:20 UTC (rev 172455)
+++ branches/safari-600.1-branch/LayoutTests/ChangeLog 2014-08-12 13:42:15 UTC (rev 172456)
</span><span class="lines">@@ -1,5 +1,24 @@
</span><span class="cx"> 2014-08-12 Lucas Forschler <lforschler@apple.com>
</span><span class="cx">
</span><ins>+ Merge r172373
+
+ 2014-08-09 Zalan Bujtas <zalan@apple.com>
+
+ Subpixel rendering: Transforms on non-compositing layers leave bits behind when the box boundaries changes.
+ https://bugs.webkit.org/show_bug.cgi?id=135786
+
+ Reviewed by Simon Fraser.
+
+ Since we don't control the transformed context painting's snapping strategy, our best bet to fully
+ include the transformed box when requesting for repaint is to use enclosing.
+ Pixelsnapping doesn't work here for all cases. For example, a scaled box at 0.8px can be anti-aliased painted
+ both at 0.5px and 1px, while with pixelsnapping we'd expect it to be painted starting from 1px;
+
+ * fast/repaint/hidpi-transform-on-subpixel-repaintrect-expected.txt: Added.
+ * fast/repaint/hidpi-transform-on-subpixel-repaintrect.html: Added.
+
+2014-08-12 Lucas Forschler <lforschler@apple.com>
+
</ins><span class="cx"> Merge r172365
</span><span class="cx">
</span><span class="cx"> 2014-08-08 Simon Fraser <simon.fraser@apple.com>
</span></span></pre></div>
<a id="branchessafari6001branchLayoutTestsfastrepainthidpitransformonsubpixelrepaintrectexpectedtxtfromrev172373trunkLayoutTestsfastrepainthidpitransformonsubpixelrepaintrectexpectedtxt"></a>
<div class="copfile"><h4>Copied: branches/safari-600.1-branch/LayoutTests/fast/repaint/hidpi-transform-on-subpixel-repaintrect-expected.txt (from rev 172373, trunk/LayoutTests/fast/repaint/hidpi-transform-on-subpixel-repaintrect-expected.txt) (0 => 172456)</h4>
<pre class="diff"><span>
<span class="info">--- branches/safari-600.1-branch/LayoutTests/fast/repaint/hidpi-transform-on-subpixel-repaintrect-expected.txt (rev 0)
+++ branches/safari-600.1-branch/LayoutTests/fast/repaint/hidpi-transform-on-subpixel-repaintrect-expected.txt 2014-08-12 13:42:15 UTC (rev 172456)
</span><span class="lines">@@ -0,0 +1,1203 @@
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+ (rect 180.50 349 10.50 10)
+ (rect 193 349 10.50 10)
+ (rect 192.50 349 10.50 10)
+ (rect 205 349 10.50 10)
+ (rect 204.50 349 10.50 10)
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+ (rect 216.50 349 10.50 10)
+ (rect 229 349 10.50 10)
+ (rect 228.50 349 10.50 10)
+ (rect 241 349 0.50 10)
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+ (rect 253 349 0.50 10)
+ (rect 263.50 349 0.50 10)
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+)
+
</ins></span></pre></div>
<a id="branchessafari6001branchLayoutTestsfastrepainthidpitransformonsubpixelrepaintrecthtmlfromrev172373trunkLayoutTestsfastrepainthidpitransformonsubpixelrepaintrecthtml"></a>
<div class="copfile"><h4>Copied: branches/safari-600.1-branch/LayoutTests/fast/repaint/hidpi-transform-on-subpixel-repaintrect.html (from rev 172373, trunk/LayoutTests/fast/repaint/hidpi-transform-on-subpixel-repaintrect.html) (0 => 172456)</h4>
<pre class="diff"><span>
<span class="info">--- branches/safari-600.1-branch/LayoutTests/fast/repaint/hidpi-transform-on-subpixel-repaintrect.html (rev 0)
+++ branches/safari-600.1-branch/LayoutTests/fast/repaint/hidpi-transform-on-subpixel-repaintrect.html 2014-08-12 13:42:15 UTC (rev 172456)
</span><span class="lines">@@ -0,0 +1,58 @@
</span><ins>+<!DOCTYPE html>
+<html>
+<head>
+<title>This tests that we use correct repaint coordinates for transformed objects.</title>
+<style>
+ div {
+ position: absolute;
+ top: 0px;
+ left: 0px;
+ width: 10px;
+ height: 10px;
+ background-color: red;
+ -webkit-transform: translateX(0.25px);
+ }
+</style>
+</head>
+<body>
+<p id="container"></p>
+<script>
+ var container = document.getElementById("container");
+ for (i = 0; i < 30; ++i) {
+ adjustment = 0;
+ for (j = 0; j < 30; ++j) {
+ var d = document.createElement("div");
+ d.style.top = (12 * i + adjustment) + "px";
+ d.style.left = (12 * j + adjustment) + "px";
+ adjustment += 0.05;
+ container.appendChild(d);
+ }
+ }
+
+ function move() {
+ var divs = document.getElementsByTagName("div");
+ for (i = 0; i < divs.length; ++i)
+ divs[i].style.left = parseInt(divs[i].style.left) + 0.3 + "px";
+
+ if (window.testRunner && window.internals) {
+ var dummy = document.body.offsetTop;
+ var repaintRects = window.internals.repaintRectsAsText();
+ window.internals.stopTrackingRepaints();
+
+ var pre = document.createElement('pre');
+ document.body.appendChild(pre);
+ pre.innerHTML = repaintRects;
+ testRunner.notifyDone();
+ }
+ }
+
+ if (window.testRunner && window.internals) {
+ window.testRunner.dumpAsText(false);
+ window.internals.startTrackingRepaints();
+ testRunner.waitUntilDone();
+ }
+
+ setTimeout(move, 0);
+</script>
+</body>
+</html>
</ins></span></pre></div>
<a id="branchessafari6001branchSourceWebCoreChangeLog"></a>
<div class="modfile"><h4>Modified: branches/safari-600.1-branch/Source/WebCore/ChangeLog (172455 => 172456)</h4>
<pre class="diff"><span>
<span class="info">--- branches/safari-600.1-branch/Source/WebCore/ChangeLog 2014-08-12 13:40:20 UTC (rev 172455)
+++ branches/safari-600.1-branch/Source/WebCore/ChangeLog 2014-08-12 13:42:15 UTC (rev 172456)
</span><span class="lines">@@ -1,5 +1,26 @@
</span><span class="cx"> 2014-08-12 Lucas Forschler <lforschler@apple.com>
</span><span class="cx">
</span><ins>+ Merge r172373
+
+ 2014-08-09 Zalan Bujtas <zalan@apple.com>
+
+ Subpixel rendering: Transforms on non-compositing layers leave bits behind when the box boundaries changes.
+ https://bugs.webkit.org/show_bug.cgi?id=135786
+
+ Reviewed by Simon Fraser.
+
+ Since we don't control the transformed context painting's snapping strategy, our best bet to fully
+ include the transformed box when requesting for repaint is to use enclosing.
+ Pixelsnapping doesn't work here for all cases. For example, a scaled box at 0.8px can be anti-aliased painted
+ both at 0.5px and 1px, while with pixelsnapping we'd expect it to be painted starting from 1px;
+
+ Test: fast/repaint/hidpi-transform-on-subpixel-repaintrect.html
+
+ * rendering/RenderBox.cpp:
+ (WebCore::RenderBox::computeRectForRepaint): enclose the result of the transform.
+
+2014-08-12 Lucas Forschler <lforschler@apple.com>
+
</ins><span class="cx"> Merge r172365
</span><span class="cx">
</span><span class="cx"> 2014-08-08 Simon Fraser <simon.fraser@apple.com>
</span></span></pre></div>
<a id="branchessafari6001branchSourceWebCorerenderingRenderBoxcpp"></a>
<div class="modfile"><h4>Modified: branches/safari-600.1-branch/Source/WebCore/rendering/RenderBox.cpp (172455 => 172456)</h4>
<pre class="diff"><span>
<span class="info">--- branches/safari-600.1-branch/Source/WebCore/rendering/RenderBox.cpp 2014-08-12 13:40:20 UTC (rev 172455)
+++ branches/safari-600.1-branch/Source/WebCore/rendering/RenderBox.cpp 2014-08-12 13:42:15 UTC (rev 172456)
</span><span class="lines">@@ -2140,7 +2140,7 @@
</span><span class="cx"> LayoutState* layoutState = view().layoutState();
</span><span class="cx">
</span><span class="cx"> if (layer() && layer()->transform())
</span><del>- rect = LayoutRect(layer()->transform()->mapRect(pixelSnappedForPainting(rect, document().deviceScaleFactor())));
</del><ins>+ rect = LayoutRect(enclosingRectForPainting(layer()->transform()->mapRect(rect), document().deviceScaleFactor()));
</ins><span class="cx">
</span><span class="cx"> // We can't trust the bits on RenderObject, because this might be called while re-resolving style.
</span><span class="cx"> if (styleToUse.hasInFlowPosition() && layer())
</span><span class="lines">@@ -2193,7 +2193,7 @@
</span><span class="cx"> // in the parent's coordinate space that encloses us.
</span><span class="cx"> if (hasLayer() && layer()->transform()) {
</span><span class="cx"> fixed = position == FixedPosition;
</span><del>- rect = LayoutRect(layer()->transform()->mapRect(pixelSnappedForPainting(rect, document().deviceScaleFactor())));
</del><ins>+ rect = LayoutRect(enclosingRectForPainting(layer()->transform()->mapRect(rect), document().deviceScaleFactor()));
</ins><span class="cx"> topLeft = rect.location();
</span><span class="cx"> topLeft.move(locationOffset());
</span><span class="cx"> } else if (position == FixedPosition)
</span></span></pre>
</div>
</div>
</body>
</html>