Re: cairo-xcb without RENDER extension?
Ingo Bürk <[email protected]>
| Newsgroups | gmane.comp.lib.cairo |
|---|---|
| Message-ID | <[email protected]> |
Hi Uli, thank you for your response. For the record / for anyone interested, we are following up on this at https://github.com/i3/i3/pull/1990 Ingo On 10/12/2015 08:05 PM, Uli Schlachter wrote: > Hi, > > Am 12.10.2015 um 11:08 schrieb Ingo Bürk: > [...] >> From the docs, I would expect that the RENDER extension is optional, >> not mandatory for cairo-xcb. Is this correct? > Yes > >> If so, are there any >> tips on how we have to use cairo to make it work if RENDER is not >> available? > Use cairo_surface_flush() where needed. > For example, after drawing to a window, use cairo_surface_flush(). Between > drawing to a pixmap and using xcb_copy_area() to move the drawing elsewhere, use > cairo_surface_flush(). > > The technical detail is: > When cairo-xcb needs to do a fallback to an image surface (some drawing that has > to be done that the X11 server cannot do for it), it keeps using that image > surface as long as possible, so that it doesn't needlessly upload/download some > buffer repeatedly. The #1 reason for fallbacks is "the server does not support > the RENDER extension", but this can also happen when the RENDER extension is > available. > > Cheers, > Uli -- cairo mailing list [email protected] http://lists.cairographics.org/mailman/listinfo/cairo