faist fooled On 4/11/09, wu tony <e13...@gmail.com> wrote: > 2009/4/10 tom <gxiao...@sohu.com> > >> >> I had read the surface flinger source code in cupcake, and hope to >> undertand how the android GUI system work. but now I am mixed-up >> still. >> and following is my understand and questions: >> >> surfaceflinger work flow: >> (1) new surfaceflingerclient(), it will createconnection(), and new a >> client >> (2) createsurface, it will new layer or layerblur or layerdim by z- >> blend order >> (3) createoverlay, if layer support overlay >> (4) register buffer >> (5) draw something on canvas(line, text, bitmap, rect...) which attach >> above buffer >> (6) post buffer >> >> my questions now: >> (1) surfaceflinger.cpp >> SurfaceFlinger::createconnection() will create a client which allocate >> 8MB heap for manangement surface data handle(color conversion, flip, >> layers). >> how many client have android system? one is BootAnimation, one is test >> sample overlays.cpp, one is debug CPUGUAGE, and one is WindowManager? >> In fact BootAnimation will destroy when it finish, (but how it destroy >> the 8MB heap?). Test sample and debug CPUGUAGE will not start for it >> is not enabled. >> So android system has only one surface flinger client, isn't it? >> OpenGL has another client? >> [tony]In my understanding,each activity will need to construct one client >> of surfaceflinger. > > > >> >> (2)createsurface() >> each app with one window has attached one surface? or all app share >> one surface? >> one surfaceflinger client can create mutiple surfaces? >> [tony]One client can create multiple surfaces,apps can't share surface. > > > >> >> (3)copybit.default.so >> where is the source code? >> [tony]should be depend on hardware. >> (4)surfaceflinger not support YUV format? >> and it ony support RGB565? >> >> more question and analysis will be continued, >> welcome helps >> >> thanks >> >> tom >> > >> > > > >
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