Le mercredi 29 décembre 2010 à 12:41 +0100, Krzysztof Sachanowicz a écrit : > I am using DirectFB 1.4.3 compiled with multiple application core. > > I have many processes, each can have one or more off-screen surfaces and > a compositor, which must have access to these surfaces and does the > composition to the primary surface. There is also a dedicated IPC > mechanism to pass ints/pointers. > > I tried creating surfaces with DSCAPS_SHARED as is explained in this post: > http://mail.directfb.org/pipermail/directfb-dev/2009-November/005356.html > but IDirectFBSurface pointer returned is not created in shared memory. > Looking into the sources, it is allocated by DIRECT_ALLOCATE_INTERFACE. > However the structure contains a pointer to CoreSurface allocated by > dfb_core_create_surface() in shared memory pool. > Corresponding part from log: > (-) [ NO NAME 2.084] ( 3302) Fusion/Object: == Surface Pool == > (-) [ NO NAME 2.085] ( 3302) Fusion/Object: -> added > 0x20018400 with ref [0x8] > (-) [ NO NAME 2.100] ( 3302) Core/Surface: -> 1920x1080 > (-) [ NO NAME 2.102] ( 3302) Core/Surface: -> RGB16 > (-) [Main Thread 2.024] ( 3304) Core/SurfBuffer: -> LAYER 0 READ > (-) [ NO NAME 2.107] ( 3302) Core/Surface: -> caps > 0x00100000 > > I suspect addresses starting from 0x20000000 are in shared memory. > > So the question is: How to create a surface in another process > referencing given CoreSurface? Or is there any other way to have > surfaces accessed by multiple processes? >
I don't think it's possible with surfaces. However you can do it with windows. Create a Window (with same properties as your buffer, ie single buffered, etc...), then get the window ID with the GetID method, and pass it to the second process, and finally use GetWindowByResourceID on the layer in the second process retrieve the same window. At this point you should be able to manipulate the window's buffer on both side. > I also looked at another approach, to use CreateWindow and in other > process window::GetSurface. I am not sure it will work when actually I > have my own window compositing. It seems a bit overcomplicated. > > Thanks, > Krzysztof Sachanowicz _______________________________________________ directfb-dev mailing list directfb-dev@directfb.org http://mail.directfb.org/cgi-bin/mailman/listinfo/directfb-dev
