| /* |
| * Copyright (C) 2012 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| #ifndef ANDROID_GUI_BUFFERITEMCONSUMER_H |
| #define ANDROID_GUI_BUFFERITEMCONSUMER_H |
| |
| #include <gui/ConsumerBase.h> |
| #include <gui/BufferQueue.h> |
| |
| #define ANDROID_GRAPHICS_BUFFERITEMCONSUMER_JNI_ID "mBufferItemConsumer" |
| |
| namespace android { |
| |
| class String8; |
| |
| /** |
| * BufferItemConsumer is a BufferQueue consumer endpoint that allows clients |
| * access to the whole BufferItem entry from BufferQueue. Multiple buffers may |
| * be acquired at once, to be used concurrently by the client. This consumer can |
| * operate either in synchronous or asynchronous mode. |
| */ |
| class BufferItemConsumer: public ConsumerBase |
| { |
| public: |
| typedef ConsumerBase::FrameAvailableListener FrameAvailableListener; |
| |
| struct BufferFreedListener : public virtual RefBase { |
| virtual void onBufferFreed(const wp<GraphicBuffer>& graphicBuffer) = 0; |
| }; |
| |
| enum { DEFAULT_MAX_BUFFERS = -1 }; |
| enum { INVALID_BUFFER_SLOT = BufferQueue::INVALID_BUFFER_SLOT }; |
| enum { NO_BUFFER_AVAILABLE = BufferQueue::NO_BUFFER_AVAILABLE }; |
| |
| // Create a new buffer item consumer. The consumerUsage parameter determines |
| // the consumer usage flags passed to the graphics allocator. The |
| // bufferCount parameter specifies how many buffers can be locked for user |
| // access at the same time. |
| // controlledByApp tells whether this consumer is controlled by the |
| // application. |
| BufferItemConsumer(const sp<IGraphicBufferConsumer>& consumer, |
| uint64_t consumerUsage, int bufferCount = DEFAULT_MAX_BUFFERS, |
| bool controlledByApp = false); |
| |
| ~BufferItemConsumer() override; |
| |
| // setBufferFreedListener sets the listener object that will be notified |
| // when an old buffer is being freed. |
| void setBufferFreedListener(const wp<BufferFreedListener>& listener); |
| |
| // Gets the next graphics buffer from the producer, filling out the |
| // passed-in BufferItem structure. Returns NO_BUFFER_AVAILABLE if the queue |
| // of buffers is empty, and INVALID_OPERATION if the maximum number of |
| // buffers is already acquired. |
| // |
| // Only a fixed number of buffers can be acquired at a time, determined by |
| // the construction-time bufferCount parameter. If INVALID_OPERATION is |
| // returned by acquireBuffer, then old buffers must be returned to the |
| // queue by calling releaseBuffer before more buffers can be acquired. |
| // |
| // 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, 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 |
| // must be released by calling releaseBuffer to ensure new buffers can be |
| // acquired by acquireBuffer. Once a BufferItem is released, the caller must |
| // not access any members of the BufferItem, and should immediately remove |
| // all of its references to the BufferItem itself. |
| status_t releaseBuffer(const BufferItem &item, |
| const sp<Fence>& releaseFence = Fence::NO_FENCE); |
| |
| private: |
| void freeBufferLocked(int slotIndex) override; |
| |
| // mBufferFreedListener is the listener object that will be called when |
| // an old buffer is being freed. If it is not NULL it will be called from |
| // freeBufferLocked. |
| wp<BufferFreedListener> mBufferFreedListener; |
| }; |
| |
| } // namespace android |
| |
| #endif // ANDROID_GUI_CPUCONSUMER_H |