Moblin2 - Window Manager(Mutter) Plugin

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Intel Moblin2's window manager, Mutter (Metacity Clutter), plugin code tracing

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Moblin2 - Window Manager(Mutter) Plugin

  1. 1. Moblin2 Window Manager(Mutter) Plugin William.L wiliwe@gmail.com 2009-07-10
  2. 2. 2 • What is Mutter? • When/Where does the window manager load plugin? • Plugin common interfaces • Where is the Clutter stage? • How the window manager show Clutter stage? • Where to add customized Clutter contents • How the window manager choose plugins? • Where is X-window client init script? • How to add debug messages in codes? Outline
  3. 3. 3 What is Mutter? Metacity Clutter Metacity A lightweight window manager written by Havoc Pennington from Red Hat Implemented with the GTK+ 2.x toolkit Integrates well with the GNOME 2.x platform Clutter An open source (LGPL 2.1) software library for creating portable and dynamic graphical user interfaces Uses OpenGL for rendering (optional OpenGL|ES on mobile and embedded platforms) Wraps an easy to use API around GL’s complexity
  4. 4. 4 When/Where does the Window Manager load Plugin? (1/2) Main Entry MetacitySrc/src/core/ main.c When it enter window manager main() and then call meta_display_open() Finally, meta_display_open() indirectly calls mutter_plugin_manager_load() and loads PluginName.so plugin Use GModule to load plugin, PluginName.so
  5. 5. 5 When/Where does the Window Manager load Plugin? (2/2) Store loaded plugin contents in a object of type of GtypeModule (MutterModule class) Default plugin file path is store in global variable MUTTER_PLUGIN_DIR The path to plugin files /usr/lib/metacity/plugins/clutter/ Current available default plugin files are default.so moblin-netbook.so
  6. 6. 6 Plugin common interfaces (1/2) Defined in MetacitySrc/src/include/ mutter-plugin.h struct _MutterPluginClass
  7. 7. 7 Plugin common interfaces (2/2) Interfaces minimize() maximize() unmaximize() map() destroy() switch_workspace() kill_effect() xevent_filter() plugin_info()
  8. 8. 8 Where is the Clutter stage? MetacitySrc/src/compositor/mutter/compositor- mutter.c struct _MetaCompScreen The Clutter stage’s initialization is in clutter_cmp_manage_screen()
  9. 9. 9 How the window manager show Clutter stage? Put Clutter stage on Overlay window layer that is between Normal window and Screen Saver window(the most top layer) MetacitySrc/src/compositor/mutter/compositor- mutter.c TheXwinOfStage = clutter_x11_get_stage_window(CLUTTER_STAGE (ClutterStage)); OverlayWin = XCompositeGetOverlayWindow (XDisplay, XRootWindow); XreparentWindow (XDisplay, TheXwinOfStage, OverlayWin, 0, 0);
  10. 10. 10 Where to add customized Clutter contents? In customized plugin class's constructed() function
  11. 11. 11 How to choose plugins? One more plugins but only one could be used in Gconf key - “apps/metacity/general/clutter_plugins“
  12. 12. Where is X-window client init script? /etc/X11/moblin/xinitrc
  13. 13. How to add debug messages in codes? Using code: g_debug("n [%]... n", G_STRLOC, ...);

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