[Webkit-unassigned] [Bug 113493] New: Enhance the restrictions on going through the faster hardware path for uploading Canvas2D to WebGL

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=113493

           Summary: Enhance the restrictions on going through the faster
                    hardware path for uploading Canvas2D to WebGL
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: All
        OS/Version: All
            Status: UNCONFIRMED
          Severity: Normal
          Priority: P2
         Component: WebGL
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: jun.a.jiang at intel.com


Current restrictions on going through the faster hardware path for uploading Canvas2D to WebGL have two issues:
1. Although Level is assumed to be 0 and hard-coded in ImageBuffer::copyToPlatformTexture as follows:
 extensions->copyTextureCHROMIUM(GraphicsContext3D::TEXTURE_2D, sourceTexture, texture, 0, internalFormat);
 The level parameter is not checked in WebGLRenderingContext::texImage2D(..., canvas) and level with a value larger than 0 can still pass through.
2. The type restrictions "type == texture->getType(target, level) && type == GraphicsContext3D::UNSIGNED_BYTE" result in that the first WebGLRenderingContext::texImage2D(..., canvas) call will go through SW path and only the successive call will go through the faster hardware path. It is because for the first call, the texture is not defined before and texture->getType(target, level) returns 0.

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