Platform/GFX/Gralloc: Difference between revisions

Platform/GFX/Gralloc (view source)

Revision as of 07:14, 22 May 2013

1,631 bytes added , 22 May 2013

→‎How Android is using Gralloc

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 = How Android is using Gralloc =
+== EGLSurface, ANativeWindow, etc. ==
+'''EGLSurface''' is a portable EGL abstraction for a possibly multi-buffered render target.
+'''ANativeWindow''' is the Android-specific abstraction for a possibly multi-buffered render target. The eglCreateWindowSurface function allows to create an EGLSurface from an ANativeWindow. There are two concrete implementations of ANativeWindow in Android: '''FramebufferNativeWindow''' and '''SurfaceTextureClient'''.
+                         EGLSurface
+                             ^                      EGL world
+                             |                    opaque handles
+                             |
+ ----------------------------+---------------------------------------
+                             |
+                             |                      Android world
+                                                     C++ classes
+                         ANativeWindow
+                         =============
+                      abstract base class
+                      /                \
+                     /                  \
+                    /                    \
+  FramebufferNativeWindow               SurfaceTextureClient
+  =======================               ====================
+ Directly linked to fbdev                What everybody uses
+ Only 1 instance system-wide
+While ANativeWindow abstracts a possibly multi-buffered render target, the individual buffers managed by ANativeWindow are instances of '''ANativeWindowBuffer'''.
+The concrete implementation of ANativeWindowBuffer is '''GraphicBuffer''', the class discussed above in this document.
 == SurfaceTexture ==