2011-05-25 Simon Fraser <simon.fraser@apple.com>

2011-05-25  Simon Fraser  <simon.fraser@apple.com>

        Reviewed by Dan Bernstein.

        Always antialias borders, outlines and rules when scaling
        https://bugs.webkit.org/show_bug.cgi?id=61502

        r84273 changed the behavior of drawLineForBoxSide() to never antialias by default.
        This actually disabled antialiasing in some circumstances where it used to be enabled,
        for example collapsed table border drawing.

        Fix by allowing antialiasing for collapsed table borders, column rules and span
        outlines when the context is scaled.

        Test: fast/borders/border-antialiasing.html

        * rendering/RenderBlock.cpp:
        (WebCore::RenderBlock::paintColumnRules):
        * rendering/RenderInline.cpp:
        (WebCore::RenderInline::paintOutline):
        (WebCore::RenderInline::paintOutlineForLine):
        * rendering/RenderTableCell.cpp:
        (WebCore::RenderTableCell::paintCollapsedBorder):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@87387 268f45cc-cd09-0410-ab3c-d52691b4dbfc