Reviewed by Dirk Schulze.

        [Cairo] Activate ContextShadow in all places where shadows are drawn
        https://bugs.webkit.org/show_bug.cgi?id=46475

        Rebaselined tests. All these changes seem reasonable. In some cases, the
        new results are much better / closer matches to Chromium.

        * platform/gtk/fast/box-shadow/basic-shadows-expected.checksum:
        * platform/gtk/fast/box-shadow/basic-shadows-expected.png:
        * platform/gtk/fast/box-shadow/inset-expected.checksum:
        * platform/gtk/fast/box-shadow/inset-expected.png:
        * platform/gtk/fast/css/shadow-multiple-expected.checksum:
        * platform/gtk/fast/css/shadow-multiple-expected.png:
        * platform/gtk/fast/text/shadow-no-blur-expected.checksum:
        * platform/gtk/fast/text/shadow-no-blur-expected.png:
        * platform/gtk/fast/text/shadow-translucent-fill-expected.checksum:
        * platform/gtk/fast/text/shadow-translucent-fill-expected.png:
        * platform/gtk/fast/text/stroking-decorations-expected.checksum:
        * platform/gtk/fast/text/stroking-decorations-expected.png:
        * platform/gtk/fast/text/stroking-expected.checksum:
        * platform/gtk/fast/text/stroking-expected.png:
        * platform/gtk/fast/transforms/shadows-expected.checksum:
        * platform/gtk/fast/transforms/shadows-expected.png:
        * platform/gtk/svg/css/arrow-with-shadow-expected.checksum:
        * platform/gtk/svg/css/arrow-with-shadow-expected.png:
        * platform/gtk/svg/css/composite-shadow-text-expected.checksum:
        * platform/gtk/svg/css/composite-shadow-text-expected.png:
        * platform/gtk/svg/css/group-with-shadow-expected.checksum:
        * platform/gtk/svg/css/group-with-shadow-expected.png:
        * platform/gtk/svg/css/path-with-shadow-expected.checksum:
        * platform/gtk/svg/css/path-with-shadow-expected.png:
        * platform/gtk/svg/css/shadow-with-large-radius-expected.checksum:
        * platform/gtk/svg/css/shadow-with-large-radius-expected.png:
        * platform/gtk/svg/css/shadow-with-negative-offset-expected.checksum:
        * platform/gtk/svg/css/shadow-with-negative-offset-expected.png:
2010-10-06  Martin Robinson  <mrobinson@igalia.com>

        Reviewed by Dirk Schulze.

        [Cairo] Activate ContextShadow in all places where shadows are drawn
        https://bugs.webkit.org/show_bug.cgi?id=46475

        Turn on ContextShadow for the Cairo port and remove all old shadow code.
        Shadow tiling optimizations will be added in a followup patch to ContextShadowCairo.

        * platform/graphics/GraphicsContext.h: Add a ContextShadow forward declaration for Cairo.
        * platform/graphics/cairo/FontCairo.cpp: Switch to using ContextShadow.
        (WebCore::prepareContextForGlyphDrawing): Added this helper which sets up the translation
        on the specified cairo_t to prepare for drawing glyphs.
        (WebCore::drawGlyphsToContext): Added this helper which draws the glyphs to a cairo_t,
        while properly handling glyphs with synthetic bold.
        (WebCore::Font::drawGlyphs): Removed old shadow code and replaced it with ContextShadow usage.
        * platform/graphics/cairo/GraphicsContextCairo.cpp:
        (WebCore::drawPathShadow): Modified this to use ContextShadow and to take an enum
        argument specifying whether to fill or stroke the solid figure for the shadow.
        (WebCore::fillCurrentCairoPath): Updated drawPathShadow call.
        (WebCore::strokeCurrentCairoPath): Ditto.
        (WebCore::GraphicsContext::savePlatformState): Save the ContextShadow.
        (WebCore::GraphicsContext::restorePlatformState): Restore the ContextShadow.
        (WebCore::GraphicsContext::drawPath): Updated drawPathShadow call.
        (WebCore::GraphicsContext::fillRect): Uses ContextShadow now.
        (WebCore::GraphicsContext::setPlatformShadow): Uses ContextShadow now.
        (WebCore::GraphicsContext::contextShadow): Added.
        (WebCore::GraphicsContext::clearPlatformShadow): Clears the ContextShadow member.
        (WebCore::GraphicsContext::fillRoundedRect): Updated drawPathShadow call.
        * platform/graphics/cairo/GraphicsContextPlatformPrivateCairo.h:
        (WebCore::GraphicsContextPlatformPrivate::hasShadow): Added.
        * platform/graphics/cairo/ImageCairo.cpp:
        (WebCore::BitmapImage::draw): Updated to use ContextShadow.

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@69681 268f45cc-cd09-0410-ab3c-d52691b4dbfc