GLConsumer: Add query for current frame number.android-4.4_r0.8

Surface the underlying frame number of the current texture.

Bug: 10830400
Change-Id: Ide3a7da12ea0aac54588beb6bf00dbfe2cd37653

2 files changed, 19 insertions, 0 deletions

diff --git a/include/gui/GLConsumer.h b/include/gui/GLConsumer.h
index 00f38b4..75ee30c 100644
--- a/include/gui/GLConsumer.h
+++ b/include/gui/GLConsumer.h
@@ -141,6 +141,13 @@ public:
     // documented by the source.
     int64_t getTimestamp();
 
+    // getFrameNumber retrieves the frame number associated with the texture
+    // image set by the most recent call to updateTexImage.
+    //
+    // The frame number is an incrementing counter set to 0 at the creation of
+    // the BufferQueue associated with this consumer.
+    int64_t getFrameNumber();
+
     // setDefaultBufferSize is used to set the size of buffers returned by
     // requestBuffers when a with and height of zero is requested.
     // A call to setDefaultBufferSize() may trigger requestBuffers() to
@@ -337,6 +344,10 @@ private:
     // gets set each time updateTexImage is called.
     int64_t mCurrentTimestamp;
 
+    // mCurrentFrameNumber is the frame counter for the current texture.
+    // It gets set each time updateTexImage is called.
+    int64_t mCurrentFrameNumber;
+
     uint32_t mDefaultWidth, mDefaultHeight;
 
     // mFilteringEnabled indicates whether the transform matrix is computed for
diff --git a/libs/gui/GLConsumer.cpp b/libs/gui/GLConsumer.cpp
index 0a2afbf..cf3f12a 100644
--- a/libs/gui/GLConsumer.cpp
+++ b/libs/gui/GLConsumer.cpp
@@ -96,6 +96,7 @@ GLConsumer::GLConsumer(const sp<IGraphicBufferConsumer>& bq, uint32_t tex,
     mCurrentScalingMode(NATIVE_WINDOW_SCALING_MODE_FREEZE),
     mCurrentFence(Fence::NO_FENCE),
     mCurrentTimestamp(0),
+    mCurrentFrameNumber(0),
     mDefaultWidth(1),
     mDefaultHeight(1),
     mFilteringEnabled(true),
@@ -380,6 +381,7 @@ status_t GLConsumer::updateAndReleaseLocked(const BufferQueue::BufferItem& item)
     mCurrentScalingMode = item.mScalingMode;
     mCurrentTimestamp = item.mTimestamp;
     mCurrentFence = item.mFence;
+    mCurrentFrameNumber = item.mFrameNumber;
 
     computeCurrentTransformMatrixLocked();
 
@@ -819,6 +821,12 @@ nsecs_t GLConsumer::getTimestamp() {
     return mCurrentTimestamp;
 }
 
+nsecs_t GLConsumer::getFrameNumber() {
+    ST_LOGV("getFrameNumber");
+    Mutex::Autolock lock(mMutex);
+    return mCurrentFrameNumber;
+}
+
 EGLImageKHR GLConsumer::createImage(EGLDisplay dpy,
         const sp<GraphicBuffer>& graphicBuffer) {
     EGLClientBuffer cbuf = (EGLClientBuffer)graphicBuffer->getNativeBuffer();