hal: adding support for DRC on WiFi display
When Dynamic Resolution Change (DRC) is triggered in the WiFi display
stack, it results in a PAUSE and a RESUME event. During DRC, the
dimensions of the framebuffer are changed. To support DRC we need to:
1. Check if a RESUME event is the result of a valid DRC event
2. Reconfigure the display's attributes to reflect resolution change
3. Enable MDP downscaling when necessary (Valid DRC cases)
Change-Id: Idc3cbc94de99a4a7299e2f6b26c3e35937c1d6c8
diff --git a/libhwcomposer/hwc_uevents.cpp b/libhwcomposer/hwc_uevents.cpp
index 5590798..cc5b482 100644
--- a/libhwcomposer/hwc_uevents.cpp
+++ b/libhwcomposer/hwc_uevents.cpp
@@ -273,6 +273,15 @@
//its pipes; we don't allow inter-mixer pipe transfers.
{
Locker::Autolock _l(ctx->mDrawLock);
+
+ // A dynamic resolution change (DRC) can be made for a WiFi
+ // display. In order to support the resolution change, we
+ // need to reconfigure the corresponding display attributes.
+ // Since DRC is only on WiFi display, we only need to call
+ // configure() on the VirtualDisplay device.
+ if(dpy == HWC_DISPLAY_VIRTUAL)
+ ctx->mVirtualDisplay->configure();
+
ctx->dpyAttr[dpy].isConfiguring = true;
ctx->dpyAttr[dpy].isActive = true;
ctx->proc->invalidate(ctx->proc);