tree ab849f69e7f22d259c21007bc842618d5803d924
parent 555c303adccae00d428cd6b6187680b36f0ef262
author Dominik Laskowski <domlaskowski@google.com> 1520908470 -0700
committer Dominik Laskowski <domlaskowski@google.com> 1525110275 -0700

SF: Generate stable display IDs using EDID

The display IDs generated by HWC are opaque handles. In order for SF and
eventually DisplayManagerService to keep track of more than two displays
and recognize previously seen displays, displays should be given stable
and persistent IDs.

If the HWC supports IComposerClient.getDisplayIdentificationData, SF
parses the EDID structure to generate stable display IDs, which will
be used in a follow-up CL to replace HWC_DISPLAY_{PRIMARY,EXTERNAL}.

Bug: 74619554
Test: dumpsys SurfaceFlinger --display-identification
Test: libsurfaceflinger_unittest
Change-Id: I1a710e2efcf1581fabe48ab96a0eb4e7a5163c0c