tree a20fb1901a2f30df068c9d58783bd13a9c3843b8
parent 7869e224aaaf717b5ab86df00b60fd5be5a0996c
author Eric Penner <epenner@google.com> 1405130884 -0700
committer Eric Penner <epenner@google.com> 1405991772 -0700

GLProducer: Reference count images rather than buffers.

In most cases, EGLImages can be created one-to-one with graphic
buffers in slots, but that was difficult due to some special
cases:
- ReleaseTexImage binds a custom 'unslotted' debug image.
- When all slots are freed, we still need to hang on to one.

These cases were handled by keeping an additional reference to
the 'current' buffer (mCurrentTextureBuf), but we would create
new images since we can't reference count them in the same way.
This patch uses the same semantics, except that it reference
counts the image (an EglImage wrapper class) rather than just
buffer. The wrapper class also detects the cases when we need
a new EGLImage, and only creates them in those rare cases.

Change-Id: I2915761dbe49d2a9bda1f59e60f857543634636b