219 lines
8.3 KiB
Text
219 lines
8.3 KiB
Text
This file lists TODO items for the compositing code.
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See file COMPOSITE_HOWTO for setting up kwin_composite.
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See file HACKING for details on developing KWin, including building
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the kwin_composite branch.
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See effects/howto.* for a HOWTO on writting effects.
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See documentation in source (mainly in scene.cpp) for description
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of the design of the compositing framework.
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TODO
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=================================
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* = not done, will be either done by me, or should be at least discussed first with me
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+ = not done, I don't plan on doing it that soon
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- in other words, these should be the best ones for you if you want to help
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! = like +, but they should be relatively simple
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- in other words, these should be the best if you want to get started with the code
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/ = work in progress
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? = should it be done?
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% = should be probably done later, during cleanups and preparations for being stable
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KDE 4.0 TODO
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=================================
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- effects (to do)
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- add generic support to use effect only for certain window types [Seli]
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- window-specific rules need to apply to unmanaged windows as well (where applicable)
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- some window-specific rules also related to compositing
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- opacity
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/ handling of window pixmaps for unmapped windows [Seli]
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- config option?
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- shm mode needs support for more data formats than GL_BGRA
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- check what works with XRender
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- documentation
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- disable application effects when kwin can provide them, e.g. shadow/transparency
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General TODO
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=================================
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+ suspend repaints if not visible or dpms is active
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- there is already 'overlay_visible', but it still polls the mouse in such case
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- it should turn off the timer
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? wait for decoration repaints
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- it is sometimes visible that the window contents are painted first and the decoration
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only afterwards with a small delay
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? - this has been already greatly improved by r632378, so it's maybe not worth it anymore
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- maybe posted paint events need to be processed immediatelly, or maybe the compositing
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code should not update the window until the decoration is finished painting
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% paint throttling
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- there's 5ms grace period per repaint to avoid overloading the system with just compositing
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and not letting the system do anything else - check and evaluate
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* handle properly stacking order of deleted windows for showing in effects
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* handle properly deleted windows that reappear (windowReadded() function?)
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% during screensaving, do no let non-screensaver windows show above screensaver
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- kdesktop_lock watches for such things and raises again, but there's a small gap
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% nvidia drivers by default use fake refresh rates as a workaround for some X limitations
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- see the DynamicTwinView section in nvidia README
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- this makes KWin repaint at a different rate than it should
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/ handling of window pixmap for unmapped windows
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- currently it's kept around after a window is unmapped
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* - but it's still discarded on e.g. resize - how to solve this?
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* - windows could be unmapped but quickly mapped back when a live thumbnail is needed
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* window grouping is not implemented for unmanaged windows (used e.g. by DimInactive)
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% clean up and sort out shortcuts so that they don't conflict and make sense
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? hidden previews currently needs input shape extension, otherwise the window can possibly interfere
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- not very likely though, so is this worth bothering at all?
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OpenGL TODO
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=================================
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/ Check/make it work with other gfx cards
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% Xgl support
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- should work
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- in SceneGL::Texture::findTarget() there is a hack that makes KWin work with XGL
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without requiring KWin to be built against the libGL version that Compiz is
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built against
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% - that may not be necessary somewhen later
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- interesting observation: normally run glxgears performs somewhat poorly compared
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to normal nvidia mode, changing glxgears to be override-redirect (i.e. no reparenting)
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however makes glxgears to be even faster than without any compositing at all,
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in this case however kwin's redrawing speed drops somewhat
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% AIGLX support
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- should work
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/ GL_ARB_texture_rectangle vs GL_ARB_texture_non_power_of_two
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% - works; bugs in tfp_mode with power_of_two textures
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- ati (others?): power_of_two windows are drawn white unless non-tfp_mode
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is forced in findTextureTarget()
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% bindTexture() optimize copied areas
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- right now bindTexture() updates every damaged area and resets the window damage
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- it might make things faster to update only areas that need to be repainted
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and keep the rest damaged until needed
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% clipping optimization
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- like XRender code has paintTransformedScreen(), avoid painting parts that are
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obscured (makes a difference with many windows open)
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- http://lists.kde.org/?l=kwin&m=116585618111882&w=2
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! shm mode needs support for more data formats than GL_BGRA
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- http://www.xfree86.org/current/glTexImage2D.3.html
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- this now works for 16bpp, but maybe not 15bpp or less
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- endian issues?
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+ support for __GL_YIELD=NOTHING and LIBGL_ALWAYS_INDIRECT should be possibly less hacky
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- or at least not hardcoded (although, does that matter?)
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- (http://lists.kde.org/?l=kwin&m=116439615124838&w=2)
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- (http://lists.freedesktop.org/archives/xorg/2006-December/020323.html)
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XRender TODO
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==============================
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+ SceneXrender::paintTransformedScreen() doesn't handle properly extending of painted area
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in window's pre-paint - see the transformedShape() comment
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- and currently seems to be generally broken
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Effects framework TODO
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==============================
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* more notification functions for effects are needed
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- currently there are only very few notification functions (windowAdded, windowActivated,...)
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! - window state changes
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? more
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/ support for grabbing input
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- during some more complicated effects, input (at least mouse) should be disabled,
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because currently there is no way to do input redirection
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+ EffectWindow should be completely opaque when kept as the only API for effects
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- no inlines, etc.
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+ EffectsHandler should not have virtuals but should instead use an internal object
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for communication with KWin core, so that adding new functions doesn't break BC all the time
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+ API for tabbox for effects should be cleaned up
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* check Scene::updateTimeDiff() - should the time be 0 or 1?
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% post calls are probably not necessary by now (http://lists.kde.org/?t=117770818100003&r=1&w=2)
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% consider using http://lists.kde.org/?l=kwin&m=118094888517415&w=2 for notification functions
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% API cleanups and making sure it will stay backwards compatible
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Effects TODO
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===============================
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! add reloadConfig() to effects
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- currently changing the global animation speed in the kcm does not change effect
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+ minimize/shade effects
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- to replace the ones from KWin core
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/ - minimizing
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- check support for it and the avoid_animation flag
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+ - shading
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- shading will probably need special support
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/ zoom effect
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- enlarge a portion of the screen
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- Should it react to meta+wheel?
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+ logout effect
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* - should be triggered by ksmserver somehow
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+ effects to replace widget effects (the ones in the Effects tab in "kcmshell style")
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/ showfps effect
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- should also detect kwin being idle - it probably should detect in pre-paint that the only
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damage is its own area and avoid damaging for the next round in post-paint
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/ scalein
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+ - should scale in from e.g. 80%, not 0%, to just "pop up"
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+ effect for drawing attention to windows demanding attention
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- Rays? Ripples?
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* DimInactive flickers when switching between windows (temporarily no window becomes active)
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- focus effect (windows waves a little when it gets focus)
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+ shadow
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+ - follow the shape of the window (currently is disabled completely using the hasOwnShadow() hack)
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+ window thumbnails directly in panel
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- i.e. the panel (taskbar?) could show window previews directly, without tooltips
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Performance
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==================
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+ various caching - there are many things that usually don't change and could gain few fps (is it worth it?)
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- Workspace::performCompositing()
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- WindowQuadList could perhaps cache quads split by contents/decoration (for select())
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+ avoiding X roundtrips each compositing pass
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- right now it at least always polls the mouse position and the current stacking order
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