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<dt>Revision</dt> <dd><a href="http://trac.webkit.org/projects/webkit/changeset/169620">169620</a></dd>
<dt>Author</dt> <dd>zalan@apple.com</dd>
<dt>Date</dt> <dd>2014-06-05 11:18:40 -0700 (Thu, 05 Jun 2014)</dd>
</dl>
<h3>Log Message</h3>
<pre>Subpixel rendering: border-radius painting falls back to rectangle when the snapped rounded rect becomes non-renderable.
https://bugs.webkit.org/show_bug.cgi?id=133491
Reviewed by Simon Fraser.
Pixel snapping can change the rectangle's size when it is on a certain subpixel position. (usually it does not)
This patch ensures that the snapped rect is still renderable by adjusting the radii as well.
Source/WebCore:
Test: fast/borders/hidpi-border-radius-with-subpixel-margin-not-renderable.html
* platform/graphics/RoundedRect.cpp:
(WebCore::RoundedRect::Radii::scale):
(WebCore::RoundedRect::pixelSnappedRoundedRectForPainting):
* platform/graphics/RoundedRect.h:
LayoutTests:
* fast/borders/hidpi-border-radius-with-subpixel-margin-not-renderable-expected.html: Added.
* fast/borders/hidpi-border-radius-with-subpixel-margin-not-renderable.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="#trunkSourceWebCoreplatformgraphicsRoundedRectcpp">trunk/Source/WebCore/platform/graphics/RoundedRect.cpp</a></li>
<li><a href="#trunkSourceWebCoreplatformgraphicsRoundedRecth">trunk/Source/WebCore/platform/graphics/RoundedRect.h</a></li>
</ul>
<h3>Added Paths</h3>
<ul>
<li><a href="#trunkLayoutTestsfastbordershidpiborderradiuswithsubpixelmarginnotrenderableexpectedhtml">trunk/LayoutTests/fast/borders/hidpi-border-radius-with-subpixel-margin-not-renderable-expected.html</a></li>
<li><a href="#trunkLayoutTestsfastbordershidpiborderradiuswithsubpixelmarginnotrenderablehtml">trunk/LayoutTests/fast/borders/hidpi-border-radius-with-subpixel-margin-not-renderable.html</a></li>
</ul>
</div>
<div id="patch">
<h3>Diff</h3>
<a id="trunkLayoutTestsChangeLog"></a>
<div class="modfile"><h4>Modified: trunk/LayoutTests/ChangeLog (169619 => 169620)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/LayoutTests/ChangeLog 2014-06-05 17:21:20 UTC (rev 169619)
+++ trunk/LayoutTests/ChangeLog 2014-06-05 18:18:40 UTC (rev 169620)
</span><span class="lines">@@ -1,3 +1,16 @@
</span><ins>+2014-06-05 Zalan Bujtas <zalan@apple.com>
+
+ Subpixel rendering: border-radius painting falls back to rectangle when the snapped rounded rect becomes non-renderable.
+ https://bugs.webkit.org/show_bug.cgi?id=133491
+
+ Reviewed by Simon Fraser.
+
+ Pixel snapping can change the rectangle's size when it is on a certain subpixel position. (usually it does not)
+ This patch ensures that the snapped rect is still renderable by adjusting the radii as well.
+
+ * fast/borders/hidpi-border-radius-with-subpixel-margin-not-renderable-expected.html: Added.
+ * fast/borders/hidpi-border-radius-with-subpixel-margin-not-renderable.html: Added.
+
</ins><span class="cx"> 2014-06-05 Frédéric Wang <fred.wang@free.fr>
</span><span class="cx">
</span><span class="cx"> Apply Character-level mirroring to stretchy operators in RTL mode.
</span></span></pre></div>
<a id="trunkLayoutTestsfastbordershidpiborderradiuswithsubpixelmarginnotrenderableexpectedhtml"></a>
<div class="addfile"><h4>Added: trunk/LayoutTests/fast/borders/hidpi-border-radius-with-subpixel-margin-not-renderable-expected.html (0 => 169620)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/LayoutTests/fast/borders/hidpi-border-radius-with-subpixel-margin-not-renderable-expected.html (rev 0)
+++ trunk/LayoutTests/fast/borders/hidpi-border-radius-with-subpixel-margin-not-renderable-expected.html 2014-06-05 18:18:40 UTC (rev 169620)
</span><span class="lines">@@ -0,0 +1,19 @@
</span><ins>+<!DOCTYPE html>
+<html>
+<head>
+<title>This tests that rounded rect on subpixel position stays renderable.</title>
+<style>
+ div {
+ width: 20px;
+ height: 20px;
+ background-color: red;
+
+ margin-top: -0.5px;
+ border-bottom-left-radius: 20px;
+ }
+</style>
+</head>
+<body>
+ <div></div>
+</body>
+</html>
</ins></span></pre></div>
<a id="trunkLayoutTestsfastbordershidpiborderradiuswithsubpixelmarginnotrenderablehtml"></a>
<div class="addfile"><h4>Added: trunk/LayoutTests/fast/borders/hidpi-border-radius-with-subpixel-margin-not-renderable.html (0 => 169620)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/LayoutTests/fast/borders/hidpi-border-radius-with-subpixel-margin-not-renderable.html (rev 0)
+++ trunk/LayoutTests/fast/borders/hidpi-border-radius-with-subpixel-margin-not-renderable.html 2014-06-05 18:18:40 UTC (rev 169620)
</span><span class="lines">@@ -0,0 +1,19 @@
</span><ins>+<!DOCTYPE html>
+<html>
+<head>
+<title>This tests that rounded rect on subpixel position stays renderable.</title>
+<style>
+ div {
+ width: 20px;
+ height: 20px;
+ background-color: red;
+
+ margin-top: -0.53px;
+ border-bottom-left-radius: 20px;
+ }
+</style>
+</head>
+<body>
+ <div></div>
+</body>
+</html>
</ins></span></pre></div>
<a id="trunkSourceWebCoreChangeLog"></a>
<div class="modfile"><h4>Modified: trunk/Source/WebCore/ChangeLog (169619 => 169620)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/WebCore/ChangeLog 2014-06-05 17:21:20 UTC (rev 169619)
+++ trunk/Source/WebCore/ChangeLog 2014-06-05 18:18:40 UTC (rev 169620)
</span><span class="lines">@@ -1,3 +1,20 @@
</span><ins>+2014-06-05 Zalan Bujtas <zalan@apple.com>
+
+ Subpixel rendering: border-radius painting falls back to rectangle when the snapped rounded rect becomes non-renderable.
+ https://bugs.webkit.org/show_bug.cgi?id=133491
+
+ Reviewed by Simon Fraser.
+
+ Pixel snapping can change the rectangle's size when it is on a certain subpixel position. (usually it does not)
+ This patch ensures that the snapped rect is still renderable by adjusting the radii as well.
+
+ Test: fast/borders/hidpi-border-radius-with-subpixel-margin-not-renderable.html
+
+ * platform/graphics/RoundedRect.cpp:
+ (WebCore::RoundedRect::Radii::scale):
+ (WebCore::RoundedRect::pixelSnappedRoundedRectForPainting):
+ * platform/graphics/RoundedRect.h:
+
</ins><span class="cx"> 2014-06-05 Commit Queue <commit-queue@webkit.org>
</span><span class="cx">
</span><span class="cx"> Unreviewed, rolling out r169587.
</span></span></pre></div>
<a id="trunkSourceWebCoreplatformgraphicsRoundedRectcpp"></a>
<div class="modfile"><h4>Modified: trunk/Source/WebCore/platform/graphics/RoundedRect.cpp (169619 => 169620)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/WebCore/platform/graphics/RoundedRect.cpp 2014-06-05 17:21:20 UTC (rev 169619)
+++ trunk/Source/WebCore/platform/graphics/RoundedRect.cpp 2014-06-05 18:18:40 UTC (rev 169620)
</span><span class="lines">@@ -43,23 +43,27 @@
</span><span class="cx">
</span><span class="cx"> void RoundedRect::Radii::scale(float factor)
</span><span class="cx"> {
</span><del>- if (factor == 1)
</del><ins>+ scale(factor, factor);
+}
+
+void RoundedRect::Radii::scale(float horizontalFactor, float verticalFactor)
+{
+ if (horizontalFactor == 1 && verticalFactor == 1)
</ins><span class="cx"> return;
</span><span class="cx">
</span><span class="cx"> // If either radius on a corner becomes zero, reset both radii on that corner.
</span><del>- m_topLeft.scale(factor);
</del><ins>+ m_topLeft.scale(horizontalFactor, verticalFactor);
</ins><span class="cx"> if (!m_topLeft.width() || !m_topLeft.height())
</span><span class="cx"> m_topLeft = LayoutSize();
</span><del>- m_topRight.scale(factor);
</del><ins>+ m_topRight.scale(horizontalFactor, verticalFactor);
</ins><span class="cx"> if (!m_topRight.width() || !m_topRight.height())
</span><span class="cx"> m_topRight = LayoutSize();
</span><del>- m_bottomLeft.scale(factor);
</del><ins>+ m_bottomLeft.scale(horizontalFactor, verticalFactor);
</ins><span class="cx"> if (!m_bottomLeft.width() || !m_bottomLeft.height())
</span><span class="cx"> m_bottomLeft = LayoutSize();
</span><del>- m_bottomRight.scale(factor);
</del><ins>+ m_bottomRight.scale(horizontalFactor, verticalFactor);
</ins><span class="cx"> if (!m_bottomRight.width() || !m_bottomRight.height())
</span><span class="cx"> m_bottomRight = LayoutSize();
</span><del>-
</del><span class="cx"> }
</span><span class="cx">
</span><span class="cx"> void RoundedRect::Radii::expand(const LayoutUnit& topWidth, const LayoutUnit& bottomWidth, const LayoutUnit& leftWidth, const LayoutUnit& rightWidth)
</span><span class="lines">@@ -240,10 +244,11 @@
</span><span class="cx"> FloatRoundedRect RoundedRect::pixelSnappedRoundedRectForPainting(float deviceScaleFactor) const
</span><span class="cx"> {
</span><span class="cx"> LayoutRect originalRect = rect();
</span><del>- FloatRect paintingRect = pixelSnappedForPainting(rect(), deviceScaleFactor);
- FloatRoundedRect::Radii paintingRadii = radii();
- paintingRadii.shrink(paintingRect.y() - originalRect.y(), originalRect.maxY() - paintingRect.maxY(), paintingRect.x() - originalRect.x(), originalRect.maxX() - paintingRect.maxX());
- return FloatRoundedRect(paintingRect, paintingRadii);
</del><ins>+ FloatRect pixelSnappedRect = pixelSnappedForPainting(originalRect, deviceScaleFactor);
+ Radii adjustedRadii = radii();
+ // Snapping usually does not alter size, but when it does, we need to make sure that the final rect is still renderable by distributing the size delta proportionally.
+ adjustedRadii.scale(pixelSnappedRect.width() / originalRect.width(), pixelSnappedRect.height() / originalRect.height());
+ return FloatRoundedRect(pixelSnappedRect, adjustedRadii);
</ins><span class="cx"> }
</span><span class="cx">
</span><span class="cx"> } // namespace WebCore
</span></span></pre></div>
<a id="trunkSourceWebCoreplatformgraphicsRoundedRecth"></a>
<div class="modfile"><h4>Modified: trunk/Source/WebCore/platform/graphics/RoundedRect.h (169619 => 169620)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/WebCore/platform/graphics/RoundedRect.h 2014-06-05 17:21:20 UTC (rev 169619)
+++ trunk/Source/WebCore/platform/graphics/RoundedRect.h 2014-06-05 18:18:40 UTC (rev 169620)
</span><span class="lines">@@ -64,6 +64,7 @@
</span><span class="cx"> void excludeLogicalEdges(bool isHorizontal, bool excludeLogicalLeftEdge, bool excludeLogicalRightEdge);
</span><span class="cx">
</span><span class="cx"> void scale(float factor);
</span><ins>+ void scale(float horizontalFactor, float verticalFactor);
</ins><span class="cx"> void expand(const LayoutUnit& topWidth, const LayoutUnit& bottomWidth, const LayoutUnit& leftWidth, const LayoutUnit& rightWidth);
</span><span class="cx"> void expand(const LayoutUnit& size) { expand(size, size, size, size); }
</span><span class="cx"> void shrink(const LayoutUnit& topWidth, const LayoutUnit& bottomWidth, const LayoutUnit& leftWidth, const LayoutUnit& rightWidth) { expand(-topWidth, -bottomWidth, -leftWidth, -rightWidth); }
</span></span></pre>
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