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Commit f52b3c88 authored by Ruchi Kandoi's avatar Ruchi Kandoi
Browse files

SurfaceFlinger: Adds the functionality to reduce refresh rate to half of 


the default.

Feature added for the low power mode.

Change-Id: I2849e5ea335c0d2509fea1c315392bce7f20451d
Signed-off-by: default avatarRuchi Kandoi <kandoiruchi@google.com>
parent 5d112a7d

services/surfaceflinger/DispSync.cpp

+22 −1
Original line number Diff line number Diff line
@@ -61,7 +61,10 @@ class DispSyncThread: public Thread { 
public:



    DispSyncThread():

            mLowPowerMode(false),

            mStop(false),

            mLastVsyncSent(false),

            mLastBufferFull(false),

            mPeriod(0),

            mPhase(0),

            mWakeupLatency(0) {
@@ -145,7 +148,18 @@ public: 
            }



            if (callbackInvocations.size() > 0) {

                if (mLowPowerMode) {

                    if (!mLastVsyncSent || !mLastBufferFull) {

                        fireCallbackInvocations(callbackInvocations);

                        mLastVsyncSent = true;

                    } else

                        mLastVsyncSent = false;

                } else {

                    fireCallbackInvocations(callbackInvocations);

                }

                mLastBufferFull = true;

            } else {

                mLastBufferFull = false;

            }

        }
@@ -200,6 +214,7 @@ public: 
        return !mEventListeners.empty();

    }



    bool mLowPowerMode;

private:



    struct EventListener {
@@ -272,6 +287,8 @@ private: 
    }



    bool mStop;

    bool mLastVsyncSent;

    bool mLastBufferFull;



    nsecs_t mPeriod;

    nsecs_t mPhase;
@@ -395,6 +412,10 @@ status_t DispSync::addEventListener(nsecs_t phase, 
    return mThread->addEventListener(phase, callback);

}



void DispSync::setLowPowerMode(bool enabled) {

    mThread->mLowPowerMode = enabled;

}



status_t DispSync::removeEventListener(const sp<Callback>& callback) {

    Mutex::Autolock lock(mMutex);

    return mThread->removeEventListener(callback);

services/surfaceflinger/DispSync.h

+3 −0
Original line number Diff line number Diff line
@@ -88,6 +88,9 @@ public: 
    // turned on.  It should NOT be used after that.

    void setPeriod(nsecs_t period);



    // Setting the low power mode reduces the frame rate to half of the default

    void setLowPowerMode(bool enabled);



    // addEventListener registers a callback to be called repeatedly at the

    // given phase offset from the hardware vsync events.  The callback is

    // called from a separate thread and it should return reasonably quickly

services/surfaceflinger/SurfaceFlinger.cpp

+10 −0
Original line number Diff line number Diff line
@@ -2643,6 +2643,16 @@ status_t SurfaceFlinger::onTransact( 
                repaintEverything();

                return NO_ERROR;

            }

            // This is an experimental interface

            // Needs to be shifted to proper binder interface when we productize

            case 1016: {

                mPrimaryDispSync.setLowPowerMode(true);

                return NO_ERROR;

            }

            case 1017: {

                mPrimaryDispSync.setLowPowerMode(false);

                return NO_ERROR;

            }

        }

    }

    return err;