Attachment 355434 Details for Bug 191893 – WIP

[patch] WIP

bug-191893-20181121122702.patch (text/plain), 2.87 KB, created by Myles C. Maxfield on 2018-11-21 12:27:03 PST

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Creator: Myles C. Maxfield

Created: 2018-11-21 12:27:03 PST

Size: 2.87 KB

patch

obsolete

>Subversion Revision: 237989
>diff --git a/Source/WebCore/ChangeLog b/Source/WebCore/ChangeLog
>index 218c09076c47856a141985d1f430b31f8f8e44fa..6b2f5f5597fb2622e6103626104e8394010a58eb 100644
>--- a/Source/WebCore/ChangeLog
>+++ b/Source/WebCore/ChangeLog
>@@ -1,3 +1,16 @@
>+2018-11-21  Myles C. Maxfield  <mmaxfield@apple.com>
>+
>+        Thin underlines on large text have ink-skipping gaps that are ugly
>+        https://bugs.webkit.org/show_bug.cgi?id=191893
>+
>+        Reviewed by NOBODY (OOPS!).
>+
>+        No new tests (OOPS!).
>+
>+        * rendering/TextDecorationPainter.cpp:
>+        (WebCore::calculateDilationAmount):
>+        (WebCore::TextDecorationPainter::paintTextDecoration):
>+
> 2018-11-08  Jonathan Hammer  <jonathan@e3software.com>
> 
>         Plain text drag in contenteditable is always DragOperationCopy, never DragOperationMove
>diff --git a/Source/WebCore/rendering/TextDecorationPainter.cpp b/Source/WebCore/rendering/TextDecorationPainter.cpp
>index bfc9ee5ae5054e5b0d3c93d997309b77308d4e47..75456e8c34085ae94e491d3751a4a8ad3391aade 100644
>--- a/Source/WebCore/rendering/TextDecorationPainter.cpp
>+++ b/Source/WebCore/rendering/TextDecorationPainter.cpp
>@@ -208,6 +208,13 @@ TextDecorationPainter::TextDecorationPainter(GraphicsContext& context, OptionSet
> {
> }
> 
>+static float calculateDilationAmount(float thickness, float fontSize)
>+{
>+    // Hyperbola, where small thicknesses still get a noticeable px gap, but for larger values it scales linearly.
>+    auto x = (thickness + fontSize / 16) / 2 * 1.3;
>+    return std::sqrt(x * x + 4 * 4);
>+}
>+
> void TextDecorationPainter::paintTextDecoration(const TextRun& textRun, const FloatPoint& textOrigin, const FloatPoint& boxOrigin)
> {
>     const auto& fontMetrics = m_lineStyle.fontMetrics();
>@@ -226,7 +233,8 @@ void TextDecorationPainter::paintTextDecoration(const TextRun& textRun, const Fl
>                 if (!m_context.paintingDisabled()) {
>                     FloatRect underlineBoundingBox = m_context.computeUnderlineBoundsForText(rect, m_isPrinting);
>                     DashArray intersections = m_font.dashesForIntersectionsWithRect(textRun, textOrigin, underlineBoundingBox);
>-                    DashArray boundaries = translateIntersectionPointsToSkipInkBoundaries(intersections, underlineBoundingBox.height(), rect.width());
>+                    auto dilationAmount = calculateDilationAmount(underlineBoundingBox.height(), m_lineStyle.computedFontSize());
>+                    DashArray boundaries = translateIntersectionPointsToSkipInkBoundaries(intersections, dilationAmount, rect.width());
>                     ASSERT(!(boundaries.size() % 2));
>                     // We don't use underlineBoundingBox here because drawLinesForText() will run computeUnderlineBoundsForText() internally.
>                     m_context.drawLinesForText(rect.location(), rect.height(), boundaries, m_isPrinting, style == TextDecorationStyle::Double, strokeStyle);

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Attachments on bug 191893: 355433 | 355434