Pay attention to buffer timestamps
When acquiring a buffer, SurfaceFlinger now computes the expected
presentation time and passes it to the BufferQueue acquireBuffer()
method. If it's not yet time to display the buffer, acquireBuffer()
returns PRESENT_LATER instead of a buffer.
The current implementation of the expected-present-time computation
uses approximations and guesswork.
Bug 7900302
Change-Id: If9345611c5983a11a811935aaf27d6388a5036f1
diff --git a/include/gui/BufferItemConsumer.h b/include/gui/BufferItemConsumer.h
index 98b450c..5bf9acb 100644
--- a/include/gui/BufferItemConsumer.h
+++ b/include/gui/BufferItemConsumer.h
@@ -71,7 +71,8 @@
//
// If waitForFence is true, and the acquired BufferItem has a valid fence object,
// acquireBuffer will wait on the fence with no timeout before returning.
- status_t acquireBuffer(BufferItem *item, bool waitForFence = true);
+ status_t acquireBuffer(BufferItem *item, nsecs_t presentWhen,
+ bool waitForFence = true);
// Returns an acquired buffer to the queue, allowing it to be reused. Since
// only a fixed number of buffers may be acquired at a time, old buffers