[Webkit-unassigned] [Bug 54550] New: remove assert when decoding non-premultiplied images

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=54550

           Summary: remove assert when decoding non-premultiplied images
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebGL
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: reed at google.com


The standard way to create a 32bit pixel in skia is to call SkPackARGB32(a,r,g,b). This puts the components in the correct (compile-time) order, and also (in the Debug build) asserts that the components are legal for premultiplied. i.e. r <= a, g <= a, b <= a. This test makes sense for Skia in general, as it only supports premultiplied bitmaps today. However, WebGL is using the same decoder and bitmap to store images that will be passed directly to opengl, and opengl supports premultiplied and non-premultiplied.

This change calls a new version of the pack macro: SkPackARGB32NoCheck(a,r,g,b) which skips the asserts on the component values (since any values can be valid for opengl).

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