Re: virtual surfaces and composition
"Henry (Yu) Song" <[email protected]>
| Newsgroups | gmane.comp.lib.cairo |
|---|---|
| Message-ID | <3955FA337689574EB32F94B12A7E6E9E6C33E6C3@sisaex01sj> |
Does cairo recording surface work for you? Unfortunately cairo recording surface does not have "TRUE" playback though. But as long as all of your operators are CAIRO_OPERATOR_OVER, you should be fine. ________________________________________ From: cairo [[email protected]] on behalf of Enrico Weigelt, metux IT consult [[email protected]] Sent: Tuesday, December 08, 2015 10:44 PM To: [email protected] Subject: [cairo] virtual surfaces and composition Hi folks, I'm currently designing a new widget toolkit (focused on embedded / full screen targets) and exploring whether cairo is suitable for that. One important thing I didnt find out yet is how to create virtual surfaces / canvas'es which later can be composited onto the screen. The idea goes like this: For each widget, there will be an virtual surface / canvas, where the the widget renders itself on. In most cases, it will only be temporarily accessible - when the engine calls the individual widget's paint handler (unless the widget explicitly asks for a permanent surface). Optimally widgets will only be repainted, when it actually changes (eg. not on moving / scrolling, etc) - it's entirely up to the engine, whether to buffer pixmaps or paint operations, etc. How can I achieve that w/ cairo ? --mtx -- mit freundlichen Grüßen -- Enrico Weigelt, metux IT consulting +49-151-27565287 -- cairo mailing list [email protected] http://lists.cairographics.org/mailman/listinfo/cairo -- cairo mailing list [email protected] http://lists.cairographics.org/mailman/listinfo/cairo