Re: nsIDOMCanvasRenderingContext2d embedding in 1.9.2 ?

On 11/8/10 8:40 AM, [email protected] wrote:
> NS_ASSERTION(!docShell ^ !mCanvasElement, "Cannot set both docshell and
> canvas element");
>
> Where am I going wrong here? Should there be some additional prior
> initialization of the context? both docShell and mCanvasElement are null.

A 2d rendering context requires either a docshell or a canvas element, 
but not both, to operate properly.  So you must either call 
SetCanvasElement or InitializeWithSurface.

If you do neither, then the 2d context doesn't actually have anywhere to 
draw to.

-Boris