tree be397ea1383b74bc09e48d591ca7aa2cc54f0539
parent 9bd5da4db97fec7cdbe6e07870411c1fcaff4365
author Mathias Agopian <mathias@google.com> 1241490565 -0700
committer Mathias Agopian <mathias@google.com> 1241734053 -0700

created an new EGL extension called ANDROID_swap_rectangle

ANDROID_swap_rectangle allows to specify the rectangle affected by eglSwapBuffers(), anything outside of this rectangle is unchanged. in particular EGL_BUFFER_DESTROYED only applies to that rectangle. This extension as well as EGL_BUFFER_PRESERVED allow major optimizations on surfaceflinger, which can redraw only the dirty area during compositing.

However, ANDROID_swap_rectangle allows further optimizations in EGL by reducing the amount of copy-back needed. ANDROID_swap_rectangle is particularily important for software implementations.