[Webkit-unassigned] [Bug 104304] New: Parameterized GraphicsContext::save()

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=104304

           Summary: Parameterized GraphicsContext::save()
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: fmalita at chromium.org


Skia (and possibly OpenVG) supports partial context saves (matrix vs. clip) and handles paint state on a separated stack in the platform code. Having call sites pass more specific information about the graphics context part that needs to be saved would enable platform-level optimizations for reducing the number of redundant save ops.

For example, code that only changes the matrix when painting its subtree could call save(SaveMatrix) instead of a full-blown save() and avoid the overhead of clip & paint save/restore.

This bug focuses on the generic plumbing needed to support such a scheme, with platform specific implementations and call site optmizations to be handled separately.

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