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<dl class="meta">
<dt>Revision</dt> <dd><a href="http://trac.webkit.org/projects/webkit/changeset/163921">163921</a></dd>
<dt>Author</dt> <dd>mmaxfield@apple.com</dd>
<dt>Date</dt> <dd>2014-02-11 17:54:19 -0800 (Tue, 11 Feb 2014)</dd>
</dl>
<h3>Log Message</h3>
<pre>Position and thickness of underline as text size changes
https://bugs.webkit.org/show_bug.cgi?id=16768
Source/WebCore:
Reviewed by Dean Jackson.
This patch adopts the iOS codepath for underlines. It also reorganizes
drawLineForText to avoid a costly global state save & restore.
Test: fast/css3-text/css3-text-decoration/text-decoration-thickness.html
* platform/graphics/cg/GraphicsContextCG.cpp:
(WebCore::computeLineBoundsAndAntialiasingModeForText):
(WebCore::GraphicsContext::computeLineBoundsForText):
(WebCore::GraphicsContext::drawLineForText):
(WebCore::GraphicsContext::drawLinesForText):
* rendering/InlineTextBox.cpp:
(WebCore::InlineTextBox::paintDecoration):
LayoutTests:
This test draws underlined text at a very large font size. It then positions and clips
the text so that the underline should fill a box if the underline grows in proportion
to text size. The comparison is to a box that has its background color set.
Reviewed by Dean Jackson.
* fast/css3-text/css3-text-decoration/text-decoration-thickness-expected.html: Added.
* fast/css3-text/css3-text-decoration/text-decoration-thickness.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="#trunkSourceWebCoreplatformgraphicscgGraphicsContextCGcpp">trunk/Source/WebCore/platform/graphics/cg/GraphicsContextCG.cpp</a></li>
<li><a href="#trunkSourceWebCorerenderingInlineTextBoxcpp">trunk/Source/WebCore/rendering/InlineTextBox.cpp</a></li>
</ul>
<h3>Added Paths</h3>
<ul>
<li><a href="#trunkLayoutTestsfastcss3textcss3textdecorationtextdecorationthicknessexpectedhtml">trunk/LayoutTests/fast/css3-text/css3-text-decoration/text-decoration-thickness-expected.html</a></li>
<li><a href="#trunkLayoutTestsfastcss3textcss3textdecorationtextdecorationthicknesshtml">trunk/LayoutTests/fast/css3-text/css3-text-decoration/text-decoration-thickness.html</a></li>
</ul>
</div>
<div id="patch">
<h3>Diff</h3>
<a id="trunkLayoutTestsChangeLog"></a>
<div class="modfile"><h4>Modified: trunk/LayoutTests/ChangeLog (163920 => 163921)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/LayoutTests/ChangeLog 2014-02-12 01:53:03 UTC (rev 163920)
+++ trunk/LayoutTests/ChangeLog 2014-02-12 01:54:19 UTC (rev 163921)
</span><span class="lines">@@ -1,3 +1,17 @@
</span><ins>+2014-02-11 Myles C. Maxfield <mmaxfield@apple.com>
+
+ Position and thickness of underline as text size changes
+ https://bugs.webkit.org/show_bug.cgi?id=16768
+
+ This test draws underlined text at a very large font size. It then positions and clips
+ the text so that the underline should fill a box if the underline grows in proportion
+ to text size. The comparison is to a box that has its background color set.
+
+ Reviewed by Dean Jackson.
+
+ * fast/css3-text/css3-text-decoration/text-decoration-thickness-expected.html: Added.
+ * fast/css3-text/css3-text-decoration/text-decoration-thickness.html: Added.
+
</ins><span class="cx"> 2014-02-10 Myles C. Maxfield <mmaxfield@apple.com>
</span><span class="cx">
</span><span class="cx"> Convert position:sticky and position:fixed properties to position:static and position:absolute upon copy
</span></span></pre></div>
<a id="trunkLayoutTestsfastcss3textcss3textdecorationtextdecorationthicknessexpectedhtml"></a>
<div class="addfile"><h4>Added: trunk/LayoutTests/fast/css3-text/css3-text-decoration/text-decoration-thickness-expected.html (0 => 163921)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/LayoutTests/fast/css3-text/css3-text-decoration/text-decoration-thickness-expected.html (rev 0)
+++ trunk/LayoutTests/fast/css3-text/css3-text-decoration/text-decoration-thickness-expected.html 2014-02-12 01:54:19 UTC (rev 163921)
</span><span class="lines">@@ -0,0 +1,14 @@
</span><ins>+<!DOCTYPE html>
+<html>
+<head>
+<style>
+</style>
+</head>
+<body>
+This test draws underlined text at a very large font size. It then positions and clips
+the text so that the underline should fill a box if the underline grows in proportion
+to text size. The comparison is to a box that has its background color set.
+<div style="position: relative; width: 600px; height: 600px; background: #000">
+</div>
+</body>
+</html>
</ins></span></pre></div>
<a id="trunkLayoutTestsfastcss3textcss3textdecorationtextdecorationthicknesshtml"></a>
<div class="addfile"><h4>Added: trunk/LayoutTests/fast/css3-text/css3-text-decoration/text-decoration-thickness.html (0 => 163921)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/LayoutTests/fast/css3-text/css3-text-decoration/text-decoration-thickness.html (rev 0)
+++ trunk/LayoutTests/fast/css3-text/css3-text-decoration/text-decoration-thickness.html 2014-02-12 01:54:19 UTC (rev 163921)
</span><span class="lines">@@ -0,0 +1,13 @@
</span><ins>+<!DOCTYPE html>
+<html>
+<head>
+</head>
+<body>
+This test draws underlined text at a very large font size. It then positions and clips
+the text so that the underline should fill a box if the underline grows in proportion
+to text size. The comparison is to a box that has its background color set.
+<div style="position: relative; width: 600px; height: 600px; overflow: hidden;">
+<div style="font-family: Ahem; text-decoration: underline; font-size: 10000px; position: absolute; left: 0px; top: -8650px;">&nbsp;</div>
+</div>
+</body>
+</html>
</ins></span></pre></div>
<a id="trunkSourceWebCoreChangeLog"></a>
<div class="modfile"><h4>Modified: trunk/Source/WebCore/ChangeLog (163920 => 163921)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/WebCore/ChangeLog 2014-02-12 01:53:03 UTC (rev 163920)
+++ trunk/Source/WebCore/ChangeLog 2014-02-12 01:54:19 UTC (rev 163921)
</span><span class="lines">@@ -1,3 +1,23 @@
</span><ins>+2014-02-11 Myles C. Maxfield <mmaxfield@apple.com>
+
+ Position and thickness of underline as text size changes
+ https://bugs.webkit.org/show_bug.cgi?id=16768
+
+ Reviewed by Dean Jackson.
+
+ This patch adopts the iOS codepath for underlines. It also reorganizes
+ drawLineForText to avoid a costly global state save & restore.
+
+ Test: fast/css3-text/css3-text-decoration/text-decoration-thickness.html
+
+ * platform/graphics/cg/GraphicsContextCG.cpp:
+ (WebCore::computeLineBoundsAndAntialiasingModeForText):
+ (WebCore::GraphicsContext::computeLineBoundsForText):
+ (WebCore::GraphicsContext::drawLineForText):
+ (WebCore::GraphicsContext::drawLinesForText):
+ * rendering/InlineTextBox.cpp:
+ (WebCore::InlineTextBox::paintDecoration):
+
</ins><span class="cx"> 2014-02-11 Ryosuke Niwa <rniwa@webkit.org>
</span><span class="cx">
</span><span class="cx"> Frame::rectForSelection shouldn't instantiate FrameSelection
</span></span></pre></div>
<a id="trunkSourceWebCoreplatformgraphicscgGraphicsContextCGcpp"></a>
<div class="modfile"><h4>Modified: trunk/Source/WebCore/platform/graphics/cg/GraphicsContextCG.cpp (163920 => 163921)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/WebCore/platform/graphics/cg/GraphicsContextCG.cpp 2014-02-12 01:53:03 UTC (rev 163920)
+++ trunk/Source/WebCore/platform/graphics/cg/GraphicsContextCG.cpp 2014-02-12 01:54:19 UTC (rev 163921)
</span><span class="lines">@@ -1346,9 +1346,6 @@
</span><span class="cx"> return FloatRect(roundedOrigin, roundedLowerRight - roundedOrigin);
</span><span class="cx"> }
</span><span class="cx">
</span><del>-// FIXME: We should look to consolidate the iOS and non-iOS implementations of
-// computeLineBoundsAndAntialiasingModeForText() and computeLineBoundsForText().
-#if PLATFORM(IOS)
</del><span class="cx"> static FloatRect computeLineBoundsAndAntialiasingModeForText(GraphicsContext& initialContext, const FloatPoint& point, float width, bool printing, bool& shouldAntialias, Color& color)
</span><span class="cx"> {
</span><span class="cx"> CGContextRef context = initialContext.platformContext();
</span><span class="lines">@@ -1387,7 +1384,6 @@
</span><span class="cx"> CGPoint devicePoint = CGPointApplyAffineTransform(point, t);
</span><span class="cx"> CGPoint deviceOrigin = CGPointMake(roundf(devicePoint.x), ceilf(devicePoint.y) + dy);
</span><span class="cx"> origin = CGPointApplyAffineTransform(deviceOrigin, CGAffineTransformInvert(t));
</span><del>- thickness /= scale;
</del><span class="cx"> }
</span><span class="cx"> return FloatRect(origin.x, origin.y, width, thickness);
</span><span class="cx"> }
</span><span class="lines">@@ -1398,44 +1394,7 @@
</span><span class="cx"> Color dummyColor;
</span><span class="cx"> return computeLineBoundsAndAntialiasingModeForText(*this, point, width, printing, dummyBool, dummyColor);
</span><span class="cx"> }
</span><del>-#else
-static FloatRect computeLineBoundsAndAntialiasingModeForText(GraphicsContext& context, const FloatPoint& point, float width, bool printing, bool& shouldAntialias)
-{
- shouldAntialias = true;
</del><span class="cx">
</span><del>- if (width <= 0)
- return FloatRect();
-
- // Use a minimum thickness of 0.5 in user space.
- // See http://bugs.webkit.org/show_bug.cgi?id=4255 for details of why 0.5 is the right minimum thickness to use.
- FloatRect initialBounds(point, FloatSize(width, std::max(context.strokeThickness(), 0.5f)));
-
- if (printing || context.paintingDisabled() || !context.getCTM(GraphicsContext::DefinitelyIncludeDeviceScale).preservesAxisAlignment())
- return initialBounds;
-
- // On screen, use a minimum thickness of 1.0 in user space (later rounded to an integral number in device space).
- FloatRect adjustedBounds = initialBounds;
- adjustedBounds.setHeight(std::max(initialBounds.height(), 1.0f));
-
- // FIXME: This should be done a better way.
- // We try to round all parameters to integer boundaries in device space. If rounding pixels in device space
- // makes our thickness more than double, then there must be a shrinking-scale factor and rounding to pixels
- // in device space will make the underlines too thick.
- FloatRect lineRect = context.roundToDevicePixels(adjustedBounds, GraphicsContext::RoundAllSides);
- if (lineRect.height() < initialBounds.height() * 2) {
- shouldAntialias = false;
- return lineRect;
- }
- return initialBounds;
-}
-
-FloatRect GraphicsContext::computeLineBoundsForText(const FloatPoint& point, float width, bool printing)
-{
- bool dummy;
- return computeLineBoundsAndAntialiasingModeForText(*this, point, width, printing, dummy);
-}
-#endif
-
</del><span class="cx"> void GraphicsContext::drawLineForText(const FloatPoint& point, float width, bool printing)
</span><span class="cx"> {
</span><span class="cx"> if (paintingDisabled())
</span><span class="lines">@@ -1444,41 +1403,25 @@
</span><span class="cx"> if (width <= 0)
</span><span class="cx"> return;
</span><span class="cx">
</span><del>-#if !PLATFORM(IOS)
</del><ins>+ Color localStrokeColor(strokeColor());
+
</ins><span class="cx"> bool shouldAntialiasLine;
</span><del>- FloatRect bounds = computeLineBoundsAndAntialiasingModeForText(*this, point, width, printing, shouldAntialiasLine);
</del><ins>+ FloatRect bounds = computeLineBoundsAndAntialiasingModeForText(*this, point, width, printing, shouldAntialiasLine, localStrokeColor);
+ bool fillColorIsNotEqualToStrokeColor = fillColor() != localStrokeColor;
</ins><span class="cx">
</span><del>- bool savedShouldAntialias = shouldAntialias();
- bool restoreAntialiasMode = savedShouldAntialias != shouldAntialiasLine;
</del><ins>+#if PLATFORM(IOS)
+ if (m_state.shouldUseContextColors)
+#endif
+ if (fillColorIsNotEqualToStrokeColor)
+ setCGFillColor(platformContext(), localStrokeColor, strokeColorSpace());
</ins><span class="cx">
</span><del>- if (restoreAntialiasMode)
- CGContextSetShouldAntialias(platformContext(), shouldAntialiasLine);
-
- bool fillColorIsNotEqualToStrokeColor = fillColor() != strokeColor();
- if (fillColorIsNotEqualToStrokeColor)
- setCGFillColor(platformContext(), strokeColor(), strokeColorSpace());
</del><span class="cx"> CGContextFillRect(platformContext(), bounds);
</span><del>- if (fillColorIsNotEqualToStrokeColor)
- setCGFillColor(platformContext(), fillColor(), fillColorSpace());
- CGContextSetShouldAntialias(platformContext(), savedShouldAntialias);
</del><span class="cx">
</span><del>- if (restoreAntialiasMode)
- CGContextSetShouldAntialias(platformContext(), true);
-#else
- CGContextRef context = platformContext();
- CGContextSaveGState(context);
-
- Color color(strokeColor());
-
- bool shouldAntialiasLine;
- FloatRect rect = computeLineBoundsAndAntialiasingModeForText(*this, point, width, printing, shouldAntialiasLine, color);
-
</del><ins>+#if PLATFORM(IOS)
</ins><span class="cx"> if (m_state.shouldUseContextColors)
</span><del>- setCGFillColor(context, color, strokeColorSpace());
- CGContextFillRect(context, rect);
-
- CGContextRestoreGState(context);
</del><span class="cx"> #endif
</span><ins>+ if (fillColorIsNotEqualToStrokeColor)
+ setCGFillColor(platformContext(), fillColor(), fillColorSpace());
</ins><span class="cx"> }
</span><span class="cx">
</span><span class="cx"> void GraphicsContext::drawLinesForText(const FloatPoint& point, const DashArray& widths, bool printing)
</span><span class="lines">@@ -1489,9 +1432,11 @@
</span><span class="cx"> if (widths.size() <= 0)
</span><span class="cx"> return;
</span><span class="cx">
</span><del>-#if !PLATFORM(IOS)
</del><ins>+ Color localStrokeColor(strokeColor());
+
</ins><span class="cx"> bool shouldAntialiasLine;
</span><del>- FloatRect bounds = computeLineBoundsAndAntialiasingModeForText(*this, point, widths.last(), printing, shouldAntialiasLine);
</del><ins>+ FloatRect bounds = computeLineBoundsAndAntialiasingModeForText(*this, point, widths.last(), printing, shouldAntialiasLine, localStrokeColor);
+ bool fillColorIsNotEqualToStrokeColor = fillColor() != localStrokeColor;
</ins><span class="cx">
</span><span class="cx"> Vector<CGRect, 4> dashBounds;
</span><span class="cx"> ASSERT(!(widths.size() % 2));
</span><span class="lines">@@ -1499,43 +1444,19 @@
</span><span class="cx"> for (size_t i = 0; i < widths.size(); i += 2)
</span><span class="cx"> dashBounds.append(CGRectMake(bounds.x() + widths[i], bounds.y(), widths[i+1] - widths[i], bounds.height()));
</span><span class="cx">
</span><del>- bool savedShouldAntialias = shouldAntialias();
- bool restoreAntialiasMode = savedShouldAntialias != shouldAntialiasLine;
</del><ins>+#if PLATFORM(IOS)
+ if (m_state.shouldUseContextColors)
+#endif
+ if (fillColorIsNotEqualToStrokeColor)
+ setCGFillColor(platformContext(), localStrokeColor, strokeColorSpace());
</ins><span class="cx">
</span><del>- if (restoreAntialiasMode)
- CGContextSetShouldAntialias(platformContext(), shouldAntialiasLine);
-
- bool fillColorIsNotEqualToStrokeColor = fillColor() != strokeColor();
- if (fillColorIsNotEqualToStrokeColor)
- setCGFillColor(platformContext(), strokeColor(), strokeColorSpace());
</del><span class="cx"> CGContextFillRects(platformContext(), dashBounds.data(), dashBounds.size());
</span><del>- if (fillColorIsNotEqualToStrokeColor)
- setCGFillColor(platformContext(), fillColor(), fillColorSpace());
- CGContextSetShouldAntialias(platformContext(), savedShouldAntialias);
</del><span class="cx">
</span><del>- if (restoreAntialiasMode)
- CGContextSetShouldAntialias(platformContext(), true);
-#else
- CGContextRef context = platformContext();
- CGContextSaveGState(context);
-
- Color color(strokeColor());
-
- bool shouldAntialiasLine;
- FloatRect rect = computeLineBoundsAndAntialiasingModeForText(*this, point, widths.last(), printing, shouldAntialiasLine, color);
-
- Vector<CGRect, 4> dashBounds;
- ASSERT(!(widths.size() % 2));
- dashBounds.reserveInitialCapacity(dashBounds.size() / 2);
- for (size_t i = 0; i < widths.size(); i += 2)
- dashBounds.append(CGRectMake(rect.x() + widths[i], rect.y(), widths[i+1] - widths[i], rect.height()));
-
</del><ins>+#if PLATFORM(IOS)
</ins><span class="cx"> if (m_state.shouldUseContextColors)
</span><del>- setCGFillColor(context, color, strokeColorSpace());
- CGContextFillRects(context, dashBounds.data(), dashBounds.size());
-
- CGContextRestoreGState(context);
</del><span class="cx"> #endif
</span><ins>+ if (fillColorIsNotEqualToStrokeColor)
+ setCGFillColor(platformContext(), fillColor(), fillColorSpace());
</ins><span class="cx"> }
</span><span class="cx">
</span><span class="cx"> void GraphicsContext::setURLForRect(const URL& link, const IntRect& destRect)
</span></span></pre></div>
<a id="trunkSourceWebCorerenderingInlineTextBoxcpp"></a>
<div class="modfile"><h4>Modified: trunk/Source/WebCore/rendering/InlineTextBox.cpp (163920 => 163921)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/WebCore/rendering/InlineTextBox.cpp 2014-02-12 01:53:03 UTC (rev 163920)
+++ trunk/Source/WebCore/rendering/InlineTextBox.cpp 2014-02-12 01:54:19 UTC (rev 163921)
</span><span class="lines">@@ -1059,9 +1059,7 @@
</span><span class="cx">
</span><span class="cx"> // Use a special function for underlines to get the positioning exactly right.
</span><span class="cx"> bool isPrinting = renderer().document().printing();
</span><del>-#if !PLATFORM(IOS)
- context.setStrokeThickness(textDecorationThickness);
-#else
</del><ins>+
</ins><span class="cx"> // On iOS we want to draw crisp decorations. The function drawLineForText takes the context's
</span><span class="cx"> // strokeThickness and renders that at device pixel scale (i.e. a strokeThickness of 1 will
</span><span class="cx"> // produce a 1 device pixel line, so thinner on retina than non-retina). We will also scale
</span><span class="lines">@@ -1075,7 +1073,6 @@
</span><span class="cx"> float fontSizeScaling = renderer().style().fontSize() / textDecorationBaseFontSize;
</span><span class="cx"> float strokeThickness = roundf(textDecorationThickness * fontSizeScaling * pageScale);
</span><span class="cx"> context.setStrokeThickness(strokeThickness);
</span><del>-#endif
</del><span class="cx">
</span><span class="cx"> bool linesAreOpaque = !isPrinting && (!(decoration & TextDecorationUnderline) || underline.alpha() == 255) && (!(decoration & TextDecorationOverline) || overline.alpha() == 255) && (!(decoration & TextDecorationLineThrough) || linethrough.alpha() == 255);
</span><span class="cx">
</span></span></pre>
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