[Webkit-unassigned] [Bug 73257] New: Canvas to WebGL Texture path Broken

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=73257

           Summary: Canvas to WebGL Texture path Broken
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebGL
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: twiz at chromium.org


Repeatedly using the same canvas-2d element as a source for WebGL textures results in incorrect results.  The content of the 2d canvas during the first texture copy is the content that is used for all subsequent texture uploads.  This is because the software snapshot of the canvas contents, HTMLCanvasElement::m_copied is never reset when the hardware accelerated path is enabled.

Summary of the problem:
 - CanvasRenderingContext2D::didDraw will early-out when the accelerated path is enabled.
 - The early out prevents HTMLCanvasElement::didDraw from being called.
 - HTMLCanvasElement::m_copied image is never reset.
 - Subsequent accesses to the canvas for texture contents will return the copied image, which contains the contents of the first pass.

See original chromium issue here: crbug.com/105119

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