[cairo] roadster install problem

Carl Worth cworth at cworth.org
Mon May 9 12:30:46 PDT 2005

On Mon, 9 May 2005 14:32:45 -0400, G Blair wrote:
> Any suggestions as to how the parameters for the cairo_create
> function call should be set up in the following code?


> 	cairo_t* pCairo = cairo_create ();
> 	cairo_set_target_drawable(pCairo, dpy, drawable);

Basically, you'll want to replace those two calls with something along
the lines of:

	cairo_surface_t* surface;
	cairo_t* pCairo;
	/* XXX: Extract Xlib Visual* from GdkPixmap here somehow */

	surface = cairo_xlib_surface_create_for_pixmap_with_visual (dpy,
	pCairo = cairo_create (surface);
	cairo_surface_destroy (surface);

I'm not sure how to get the Visual* from the GdkPixmap though. Maybe
Owen can chime in here. And I would suggest using "pixmap" rather than
"drawable" for the identifier.

That's the end of the answer, but since I've got API issues on the

I wonder if we've got the right names for the cairo_xlib_surface
create functions. So far, all my code uses the "with_visual" version,
(since I need to be Visual-compatible with something to do an
XCopyArea at some point). Should we drop "with_visual" and stick the
format-accepting version with the longer name? That is:

cairo_surface_t *
cairo_xlib_surface_create_for_pixmap_with_format (Display        *dpy,
                                                  Pixmap          pixmap,
                                                  cairo_format_t  format);

cairo_surface_t *
cairo_xlib_surface_create_for_pixmap (Display  *dpy,
                                      Pixmap    pixmap,
                                      Visual   *visual);

cairo_surface_t *
cairo_xlib_surface_create_for_window (Display  *dpy,
                                      Window    window,
                                      Visual   *visual);

I think Owen also suggested (half-seriously ?) removing the
Window-accepting version. That would let us drop the "for_pixmap" from
the remaining two names which would reign in the length quite nicely.

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