I want to create a canvas element from C++ and pass to javascript, so js can do the drawing/rendering

[Yonggang Luo]

The parameters are comes from

void
nsTreeBodyFrame::PaintCell(int32_t              aRowIndex,
                           nsTreeColumn*        aColumn,
                           const nsRect&        aCellRect,
                           nsPresContext*       aPresContext,
                           nsRenderingContext& aRenderingContext,
                           const nsRect&        aDirtyRect,
                           nscoord&             aCurrX,
                           nsPoint              aPt)


I want to creating the canvas element from these parameters and have the same 
effect with <html:canvas> how to do that?


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