Re: BadImplementation X Window System error with GTK+ 2.6.1

[James Henstridge <james jamesh id au>]

Albert Chin wrote:

> Is it possible to query the RENDER extension to determine if it
> supports the RenderTrapezoids request? I could then augment
> _gdk_x11_have_render(). I haven't a clue about how to do this though.
>  
You can query the XRENDER extension protocol version using the 
XRenderQueryVersion() function.  From the Cairo source, it would appear 
that the given protocol request was added in version 0.4:

#define CAIRO_SURFACE_RENDER_HAS_TRAPEZOIDS(surface) 
CAIRO_SURFACE_RENDER_AT_LEAST((surface), 0, 4)

Also, remember that the availability of the CompositeTrapezoids will 
differ from display to display, so a global 
"has_xrender_composite_trapezoids" variable would not be appropriate 
here (although you probably want to cache the result of 
XRenderQueryVersion).

James.