tree acef7520d6c36ec59192321ce8632b70a58724ab
parent 9cd766a517caeb58669722fad7fdf623a8c1b83c
author Mathias Agopian <mathias@google.com> 1363756941 -0700
committer Mathias Agopian <mathias@google.com> 1363756941 -0700

rework how we take screenshots for a CPU consumer

We're not using IMemoryHeap as a transport anymore,
instead we're providing a CpuConsumer and use the
IGraphicBufferProducer version of the screenshot API.

However, some GPU drivers don't support properly
a GPU to CPU path, to work around this, we use a
temporary BufferQueue on the server side for the
GL rendering, and we use glReadPixels into the
CpuConsumer (we're now using a CPU to CPU path
which is always supported).

Currently this "wrapping" is always performed,
but it can be bypassed on devices that support
the GPU to CPU path.

This also addresses a DoS attack vector on
SurfaceFlinger, where an application could
consume all of SF's filedescriptors by creating
a lot of screenshots in a row.

Bug: 8390553

Change-Id: I9e81514c2a7711b9bb393f74305be7d2abe08f1c