Am Freitag 04 Juni 2010, 23:47:07 schrieb Aaron J. Seigo: > another approach might be to make it a kwin plugin, and have the video > window rendered beneath the PMC window using a compositing plugin. this > plugin would need to know what the video window is and what the PMC window > is (can be done using XAtoms specific to the plugin) and then render the > video window under the PMC window and not using the normal rendering. one > of the KWin people might be able to help guide us here in how best to make > that happen, and the plugin could probably ship with PMC itself. this > would tie PMC to kwin, but it would also mean that it would work just > great non-fullscreen and without any window management hacks in PMC > itself. I think that this could work, but I want to point out two things: 1. Texture from pixmap is quite heavy with some drivers. CPU usage for kwin increases to approx. 20 % when watching a video on my system. I often turn compositing off when watching fullscreen movies and don't need effects. Depending on the hardware PMC is targeting this could become a problem. On the other hand it's likely that we need compositing as we might want to have nice alpha-blended overlay controls in own windows, etc. etc. Also we have to tweak kwin so that the effect enforces that the fullscreen video window is not unredirected. Something I wanted to add for a long time...
2. The effect should live in kwin source directory because the KWin Effects API does not provide a stable ABI. If the PMC effects live in another source tree and PMC is released together with PMC I don't see a problem - except that the effect is not magically updated by kwin devs. If it's released seperately we have to find a solution. Maybe that would be an excuse to start to think about providing a stable ABI ;-) (Although I already have ideas how to break ABI as soon as 4.6 development starts)
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