Add two new display info fields
This adds SurfaceFlinger's app VSYNC offset and buffer deadline
values to DisplayInfo.
Bug 14612039
Change-Id: Ie0ab21d388fe2764f2b6f71bd1cefa33dc861a73
diff --git a/services/surfaceflinger/SurfaceFlinger.cpp b/services/surfaceflinger/SurfaceFlinger.cpp
index edf867a..4ecdc8b 100644
--- a/services/surfaceflinger/SurfaceFlinger.cpp
+++ b/services/surfaceflinger/SurfaceFlinger.cpp
@@ -576,6 +576,22 @@
info.xdpi = xdpi;
info.ydpi = ydpi;
info.fps = float(1e9 / hwConfig.refresh);
+ info.appVsyncOffset = VSYNC_EVENT_PHASE_OFFSET_NS;
+
+ // This is how far in advance a buffer must be queued for
+ // presentation at a given time. If you want a buffer to appear
+ // on the screen at time N, you must submit the buffer before
+ // (N - presentationDeadline).
+ //
+ // Normally it's one full refresh period (to give SF a chance to
+ // latch the buffer), but this can be reduced by configuring a
+ // DispSync offset. Any additional delays introduced by the hardware
+ // composer or panel must be accounted for here.
+ //
+ // We add an additional 1ms to allow for processing time and
+ // differences between the ideal and actual refresh rate.
+ info.presentationDeadline =
+ hwConfig.refresh - SF_VSYNC_EVENT_PHASE_OFFSET_NS + 1000000;
// All non-virtual displays are currently considered secure.
info.secure = true;
@@ -586,11 +602,11 @@
return NO_ERROR;
}
-int SurfaceFlinger::getActiveConfig(const sp<IBinder>& display) {
+int SurfaceFlinger::getActiveConfig(const sp<IBinder>&) {
return 0;
}
-status_t SurfaceFlinger::setActiveConfig(const sp<IBinder>& display, int id) {
+status_t SurfaceFlinger::setActiveConfig(const sp<IBinder>&, int) {
return NO_ERROR;
}