Avoid X errors when running against servers which implement XRender < 0.4.

Avoid X errors when running against servers which implement XRender < 0.4.

2005-01-18  Matthias Clasen  <mclasen@redhat.com>

	Avoid X errors when running against servers which
	implement XRender < 0.4.  (#164427, Albert Chin)

	* gdk/x11/gdkprivate-x11.h:
	* gdk/x11/gdkdrawable-x11.c (_gdk_x11_have_render_with_trapezoids):
	New function to check for trapezoid support in XRender.
	(gdk_x11_draw_trapezoids, _gdk_x11_drawable_draw_xtrapezoids):
	Use it here.

	* gdk/x11/gdkdisplay-x11.h (struct _GdkDisplayX11): Add a
	separate have_render_with_trapezoids field.

	* gdk/x11/gdkdisplay-x11.c (gdk_display_open): Initialize it.