new allocation-minimizing bitmap decoder
Use a new image decoding and caching framework. This one maximizes
bitmap reuse by decoding into fixed-sized Bitmaps and relying on
BitmapRegionDecoder to only decode a desired region. The ultimate goal
is to allocate memory less often, as each large allocation triggers
GC jank.
The overall request/response abstraction and threading model are now
cleaner, and caching is no longer a required fixture. Multi-core
decoding is now supported, with a currently fixed thread pool size of 4.
Attachment images are the only client for now, but contact photos will
switch to this framework next.
Bug: 9566006
Change-Id: I7c437941fd984cc0038da8f0ffd1df1a9ced4dd3
26 files changed