[Webkit-unassigned] [Bug 145492] New: [WinCairo] ClearType should be enabled on Cairo port

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=145492

            Bug ID: 145492
           Summary: [WinCairo] ClearType should be enabled on Cairo port
    Classification: Unclassified
           Product: WebKit
           Version: 528+ (Nightly build)
          Hardware: PC
                OS: Windows 8
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: szkarlen at gmail.com

Created attachment 253958
  --> https://bugs.webkit.org/attachment.cgi?id=253958&action=review
Cairo port text rendering behaviour for custom fonts with and without ClearType

Overview: by default Cairo port uses CAIRO_ANTIALIAS_GRAY for text antialiasing, which results to using ANTIALIASED_QUALITY for Unicscribe text rendering on Windows platform instead of CLEARTYPE_QUALITY (corresponding Cairo antialiasing mode is CAIRO_ANTIALIAS_BEST).

Steps to reproduce:
Open any web page with embedded fonts (http://www.apple.com/mac/, for example).

Actual result: some amount of text is rendered thin and semi-transparent (as it should NOT be).

Expected result: smooth text as shown on the right side of the attachment (wincairo_text_rendering_diff.png).

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