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<title>[172373] trunk</title>
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<div id="msg">
<dl class="meta">
<dt>Revision</dt> <dd><a href="http://trac.webkit.org/projects/webkit/changeset/172373">172373</a></dd>
<dt>Author</dt> <dd>zalan@apple.com</dd>
<dt>Date</dt> <dd>2014-08-09 17:48:59 -0700 (Sat, 09 Aug 2014)</dd>
</dl>
<h3>Log Message</h3>
<pre>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;
Source/WebCore:
Test: fast/repaint/hidpi-transform-on-subpixel-repaintrect.html
* rendering/RenderBox.cpp:
(WebCore::RenderBox::computeRectForRepaint): enclose the result of the transform.
LayoutTests:
* fast/repaint/hidpi-transform-on-subpixel-repaintrect-expected.txt: Added.
* fast/repaint/hidpi-transform-on-subpixel-repaintrect.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="#trunkSourceWebCorerenderingRenderBoxcpp">trunk/Source/WebCore/rendering/RenderBox.cpp</a></li>
</ul>
<h3>Added Paths</h3>
<ul>
<li><a href="#trunkLayoutTestsfastrepainthidpitransformonsubpixelrepaintrectexpectedtxt">trunk/LayoutTests/fast/repaint/hidpi-transform-on-subpixel-repaintrect-expected.txt</a></li>
<li><a href="#trunkLayoutTestsfastrepainthidpitransformonsubpixelrepaintrecthtml">trunk/LayoutTests/fast/repaint/hidpi-transform-on-subpixel-repaintrect.html</a></li>
</ul>
</div>
<div id="patch">
<h3>Diff</h3>
<a id="trunkLayoutTestsChangeLog"></a>
<div class="modfile"><h4>Modified: trunk/LayoutTests/ChangeLog (172372 => 172373)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/LayoutTests/ChangeLog 2014-08-09 06:50:19 UTC (rev 172372)
+++ trunk/LayoutTests/ChangeLog 2014-08-10 00:48:59 UTC (rev 172373)
</span><span class="lines">@@ -1,3 +1,18 @@
</span><ins>+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.
+
</ins><span class="cx"> 2014-08-08 Simon Fraser <simon.fraser@apple.com>
</span><span class="cx">
</span><span class="cx"> Load the layout test result image diff HTML from a file, rather than having it inline in webkitpy
</span></span></pre></div>
<a id="trunkLayoutTestsfastrepainthidpitransformonsubpixelrepaintrectexpectedtxt"></a>
<div class="addfile"><h4>Added: trunk/LayoutTests/fast/repaint/hidpi-transform-on-subpixel-repaintrect-expected.txt (0 => 172373)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/LayoutTests/fast/repaint/hidpi-transform-on-subpixel-repaintrect-expected.txt (rev 0)
+++ trunk/LayoutTests/fast/repaint/hidpi-transform-on-subpixel-repaintrect-expected.txt 2014-08-10 00:48:59 UTC (rev 172373)
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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)
+ (rect 217 349 10.50 10)
+ (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)
+ (rect 251.50 349 0.50 10)
+ (rect 253 349 0.50 10)
+ (rect 263.50 349 0.50 10)
+ (rect 265 349 0.50 10)
+ (rect 275.50 349 0.50 10)
+ (rect 277 349 0.50 10)
+ (rect 287.50 349 0.50 10)
+ (rect 289 349 0.50 10)
+ (rect 299.50 349 0.50 10)
+)
+
</ins></span></pre></div>
<a id="trunkLayoutTestsfastrepainthidpitransformonsubpixelrepaintrecthtml"></a>
<div class="addfile"><h4>Added: trunk/LayoutTests/fast/repaint/hidpi-transform-on-subpixel-repaintrect.html (0 => 172373)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/LayoutTests/fast/repaint/hidpi-transform-on-subpixel-repaintrect.html (rev 0)
+++ trunk/LayoutTests/fast/repaint/hidpi-transform-on-subpixel-repaintrect.html 2014-08-10 00:48:59 UTC (rev 172373)
</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="trunkSourceWebCoreChangeLog"></a>
<div class="modfile"><h4>Modified: trunk/Source/WebCore/ChangeLog (172372 => 172373)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/WebCore/ChangeLog 2014-08-09 06:50:19 UTC (rev 172372)
+++ trunk/Source/WebCore/ChangeLog 2014-08-10 00:48:59 UTC (rev 172373)
</span><span class="lines">@@ -1,3 +1,20 @@
</span><ins>+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.
+
</ins><span class="cx"> 2014-08-08 Mark Lam <mark.lam@apple.com>
</span><span class="cx">
</span><span class="cx"> REGRESSION: Inspector crashes when debugger is paused and injected scripts access window.screen().
</span></span></pre></div>
<a id="trunkSourceWebCorerenderingRenderBoxcpp"></a>
<div class="modfile"><h4>Modified: trunk/Source/WebCore/rendering/RenderBox.cpp (172372 => 172373)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/WebCore/rendering/RenderBox.cpp 2014-08-09 06:50:19 UTC (rev 172372)
+++ trunk/Source/WebCore/rendering/RenderBox.cpp 2014-08-10 00:48:59 UTC (rev 172373)
</span><span class="lines">@@ -2116,7 +2116,7 @@
</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">@@ -2169,7 +2169,7 @@
</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>
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</body>
</html>