https://bugs.webkit.org/show_bug.cgi?id=94094

Patch by Bruno de Oliveira Abinader <bruno.abinader@basyskom.com> on 2012-10-22
Reviewed by Julien Chaffraix.

Source/WebCore:

This patch implements the "text-decoration-style" property rendering as
specified in CSS3 working draft, with "-webkit-" prefix. The specification can
be found here: http://dev.w3.org/csswg/css3-text/#text-decoration-style

Additionally, Mozilla implementation details can be found here:
https://developer.mozilla.org/en/CSS/text-decoration-style

Tests: fast/css3-text/css3-text-decoration/repaint/repaint-text-decoration-style.html
       fast/css3-text/css3-text-decoration/text-decoration-style.html

* platform/graphics/GraphicsContext.h:
* platform/graphics/cairo/GraphicsContextCairo.cpp:
(WebCore::GraphicsContext::setPlatformStrokeStyle):
* platform/graphics/cg/GraphicsContextCG.cpp:
(WebCore::GraphicsContext::drawLine):
* platform/graphics/qt/GraphicsContextQt.cpp:
(WebCore::toQPenStyle):
(WebCore::GraphicsContext::drawLine):
* platform/graphics/skia/PlatformContextSkia.cpp:
(WebCore::PlatformContextSkia::setupPaintForStroking):
* platform/graphics/wince/GraphicsContextWinCE.cpp:
(WebCore::createPen):
* platform/graphics/wx/GraphicsContextWx.cpp:
(WebCore::strokeStyleToWxPenStyle):
Added 'DoubleStroke' and 'WavyStroke' to StrokeStyle enum and updated
platform-specific stroke handling. Some styles requires
platform-specific implementation (handled in bug 92868).
* rendering/InlineTextBox.cpp:
(WebCore::InlineTextBox::paint):
(WebCore::textDecorationStyleToStrokeStyle): Added static function that
translates text decoration to stroke styles.
(WebCore::InlineTextBox::paintDecoration): Text decoration style does
not specify a property for line thickness (like border-width does for
border style), so we statically set it to 1 for now. The 'double' style
implementation simply adds a parallel line (depending if it is
underline, overline or line-through) and the space between lines follows
the approach used by border's 'double' style.
* rendering/InlineTextBox.h:
(InlineTextBox):
* rendering/style/RenderStyle.h:
* rendering/style/RenderStyleConstants.h:
Added text decoration style rendering support to
InlineTextBox::paintDecoration().

LayoutTests:

Added paint and repaint layout tests for CSS3 text-decoration-style
property. Pixel results are not included due to missing platform support
for some decoration styles (handled on bug 93507). These are going
to be added when platform support is complete.

* fast/css3-text/css3-text-decoration/repaint/repaint-text-decoration-style-expected.txt: Added.
* fast/css3-text/css3-text-decoration/repaint/repaint-text-decoration-style.html: Added.
* fast/css3-text/css3-text-decoration/text-decoration-style-expected.txt: Added.
* fast/css3-text/css3-text-decoration/text-decoration-style.html: Added.

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@132076 268f45cc-cd09-0410-ab3c-d52691b4dbfc