tree ebc1358a3cdcfb69f0427769756cbc83914f6c29
parent 81ab046a1127bd2ad397e6d1c6f8021b202a97ff
author Romain Guy <romainguy@google.com> 1284426009 -0700
committer Romain Guy <romainguy@google.com> 1284426201 -0700

Document the implementation of saveLayer().

The implementation is simple but tricky. Leave explanations to my
future self so that I don't invent a time machine to come back to
now and slap my self.

This change also simplifies the way the GL blending function is
chosen when compositing a layer. It reuses existing OpenGLRenderer
APIs and is easier to understand.

Change-Id: I1b9cf8c5d51e09836d85b8cf157a1c284aa65c59