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Add two new display info fields 

This adds SurfaceFlinger's app VSYNC offset and buffer deadline
values to DisplayInfo.

Bug 14612039

Change-Id: Ie0ab21d388fe2764f2b6f71bd1cefa33dc861a73
This commit is contained in:
Andy McFadden 2014-06-13 14:04:23 -07:00
parent 24730ee621
commit 91b2ca8562
2 changed files with 21 additions and 2 deletions
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3
include/ui/DisplayInfo.h
View File

@ -19,6 +19,7 @@
#include <stdint.h>
#include <sys/types.h>
#include <utils/Timers.h>
#include <ui/PixelFormat.h>
@ -33,6 +34,8 @@ struct DisplayInfo {
float density;
uint8_t orientation;
bool secure;
nsecs_t appVsyncOffset;
nsecs_t presentationDeadline;
};
/* Display orientations as defined in Surface.java and ISurfaceComposer.h. */

20
services/surfaceflinger/SurfaceFlinger.cpp
View File

@ -576,6 +576,22 @@ status_t SurfaceFlinger::getDisplayConfigs(const sp<IBinder>& display,
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 @@ status_t SurfaceFlinger::getDisplayConfigs(const sp<IBinder>& display,
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;
}