[Webkit-unassigned] [Bug 147242] New: [Win] Support High DPI drawing with CACFLayers

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=147242

            Bug ID: 147242
           Summary: [Win] Support High DPI drawing with CACFLayers
    Classification: Unclassified
           Product: WebKit
           Version: 528+ (Nightly build)
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: bfulgham at webkit.org

This is a follow-up to Bug 146335, which added support for High DPI use in our non-accelerated drawing paths.

The Windows platform doesn't allow a single device scaling factor to be applied to individual windows. Instead, high DPI state is handled by working with larger pixel surfaces at higher DPIs, and performing scaling calculations to control widget size, positioning, etc. Yuck!

This patch applies the proper scaling at various phases of our CACFLayer sizing and positioning.

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