int32_t identity; // surface's identity (const)
int32_t token; // surface's token (for debugging)
- int32_t reserved32[1];
Statistics stats;
+ int8_t headBuf; // last retired buffer
+ uint8_t reservedBytes[3];
int32_t reserved;
BufferData buffers[NUM_BUFFER_MAX]; // 1024 bytes
};
status_t undoDequeue(int buf);
status_t lock(int buf);
+ status_t cancel(int buf);
status_t queue(int buf);
bool needNewBuffer(int buffer) const;
status_t setDirtyRegion(int buffer, const Region& reg);
inline ssize_t operator()();
};
- struct UndoDequeueUpdate : public UpdateBase {
- inline UndoDequeueUpdate(SharedBufferBase* sbb);
+ struct CancelUpdate : public UpdateBase {
+ int tail, buf;
+ inline CancelUpdate(SharedBufferBase* sbb, int tail, int buf);
inline ssize_t operator()();
};
int mNumBuffers;
int32_t tail;
- int32_t undoDequeueTail;
int32_t queued_head;
// statistics...
nsecs_t mDequeueTime[SharedBufferStack::NUM_BUFFER_MAX];
*/
static int setSwapInterval(ANativeWindow* window, int interval);
static int dequeueBuffer(ANativeWindow* window, android_native_buffer_t** buffer);
+ static int cancelBuffer(ANativeWindow* window, android_native_buffer_t* buffer);
static int lockBuffer(ANativeWindow* window, android_native_buffer_t* buffer);
static int queueBuffer(ANativeWindow* window, android_native_buffer_t* buffer);
static int query(ANativeWindow* window, int what, int* value);
int dequeueBuffer(android_native_buffer_t** buffer);
int lockBuffer(android_native_buffer_t* buffer);
int queueBuffer(android_native_buffer_t* buffer);
+ int cancelBuffer(android_native_buffer_t* buffer);
int query(int what, int* value);
int perform(int operation, va_list args);
int (*perform)(struct ANativeWindow* window,
int operation, ... );
- void* reserved_proc[3];
+ /*
+ * hook used to cancel a buffer that has been dequeued.
+ * No synchronization is performed between dequeue() and cancel(), so
+ * either external synchronization is needed, or these functions must be
+ * called from the same thread.
+ */
+ int (*cancelBuffer)(struct ANativeWindow* window,
+ struct android_native_buffer_t* buffer);
+
+
+ void* reserved_proc[2];
};
// Backwards compatibility... please switch to ANativeWindow.
return NO_ERROR;
}
-SharedBufferClient::UndoDequeueUpdate::UndoDequeueUpdate(SharedBufferBase* sbb)
- : UpdateBase(sbb) {
+SharedBufferClient::CancelUpdate::CancelUpdate(SharedBufferBase* sbb,
+ int tail, int buf)
+ : UpdateBase(sbb), tail(tail), buf(buf) {
}
-ssize_t SharedBufferClient::UndoDequeueUpdate::operator()() {
+ssize_t SharedBufferClient::CancelUpdate::operator()() {
+ stack.index[tail] = buf;
android_atomic_inc(&stack.available);
return NO_ERROR;
}
return BAD_VALUE;
// Preventively lock the current buffer before updating queued.
- android_atomic_write(stack.index[head], &stack.inUse);
+ android_atomic_write(stack.headBuf, &stack.inUse);
// Decrement the number of queued buffers
int32_t queued;
// the buffer we preventively locked upon entering this function
head = (head + 1) % numBuffers;
- android_atomic_write(stack.index[head], &stack.inUse);
+ const int8_t headBuf = stack.index[head];
+ stack.headBuf = headBuf;
+ android_atomic_write(headBuf, &stack.inUse);
// head is only modified here, so we don't need to use cmpxchg
android_atomic_write(head, &stack.head);
SharedBufferClient::SharedBufferClient(SharedClient* sharedClient,
int surface, int num, int32_t identity)
: SharedBufferBase(sharedClient, surface, identity),
- mNumBuffers(num), tail(0), undoDequeueTail(0)
+ mNumBuffers(num), tail(0)
{
SharedBufferStack& stack( *mSharedStack );
tail = computeTail();
DequeueUpdate update(this);
updateCondition( update );
- undoDequeueTail = tail;
int dequeued = stack.index[tail];
tail = ((tail+1 >= mNumBuffers) ? 0 : tail+1);
LOGD_IF(DEBUG_ATOMICS, "dequeued=%d, tail++=%d, %s",
status_t SharedBufferClient::undoDequeue(int buf)
{
+ return cancel(buf);
+}
+
+status_t SharedBufferClient::cancel(int buf)
+{
RWLock::AutoRLock _rd(mLock);
- // TODO: we can only undo the previous dequeue, we should
- // enforce that in the api
- UndoDequeueUpdate update(this);
+ // calculate the new position of the tail index (essentially tail--)
+ int localTail = (tail + mNumBuffers - 1) % mNumBuffers;
+ CancelUpdate update(this, localTail, buf);
status_t err = updateCondition( update );
if (err == NO_ERROR) {
- tail = undoDequeueTail;
+ tail = localTail;
}
return err;
}
{
ANativeWindow::setSwapInterval = setSwapInterval;
ANativeWindow::dequeueBuffer = dequeueBuffer;
+ ANativeWindow::cancelBuffer = cancelBuffer;
ANativeWindow::lockBuffer = lockBuffer;
ANativeWindow::queueBuffer = queueBuffer;
ANativeWindow::query = query;
return self->dequeueBuffer(buffer);
}
+int Surface::cancelBuffer(ANativeWindow* window,
+ android_native_buffer_t* buffer) {
+ Surface* self = getSelf(window);
+ return self->cancelBuffer(buffer);
+}
+
int Surface::lockBuffer(ANativeWindow* window,
android_native_buffer_t* buffer) {
Surface* self = getSelf(window);
return err;
}
+int Surface::cancelBuffer(android_native_buffer_t* buffer)
+{
+ status_t err = validate();
+ switch (err) {
+ case NO_ERROR:
+ // no error, common case
+ break;
+ case INVALID_OPERATION:
+ // legitimate errors here
+ return err;
+ default:
+ // other errors happen because the surface is now invalid,
+ // for instance because it has been destroyed. In this case,
+ // we just fail silently (canceling a buffer is not technically
+ // an error at this point)
+ return NO_ERROR;
+ }
+
+ int32_t bufIdx = getBufferIndex(GraphicBuffer::getSelf(buffer));
+
+ err = mSharedBufferClient->cancel(bufIdx);
+
+ LOGE_IF(err, "error canceling buffer %d (%s)", bufIdx, strerror(-err));
+ return err;
+}
+
+
int Surface::lockBuffer(android_native_buffer_t* buffer)
{
status_t err = validate();
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