92 lines
3.6 KiB
C
92 lines
3.6 KiB
C
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/*
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* Copyright (C) 2012 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef ANDROID_GUI_BUFFERITEMCONSUMER_H
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#define ANDROID_GUI_BUFFERITEMCONSUMER_H
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#include <gui/ConsumerBase.h>
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#include <ui/GraphicBuffer.h>
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#include <utils/String8.h>
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#include <utils/Vector.h>
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#include <utils/threads.h>
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#define ANDROID_GRAPHICS_BUFFERITEMCONSUMER_JNI_ID "mBufferItemConsumer"
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namespace android {
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/**
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* BufferItemConsumer is a BufferQueue consumer endpoint that allows clients
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* access to the whole BufferItem entry from BufferQueue. Multiple buffers may
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* be acquired at once, to be used concurrently by the client. This consumer can
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* operate either in synchronous or asynchronous mode.
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*/
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class BufferItemConsumer: public ConsumerBase
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{
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public:
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typedef ConsumerBase::FrameAvailableListener FrameAvailableListener;
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typedef BufferQueue::BufferItem BufferItem;
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enum { INVALID_BUFFER_SLOT = BufferQueue::INVALID_BUFFER_SLOT };
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enum { NO_BUFFER_AVAILABLE = BufferQueue::NO_BUFFER_AVAILABLE };
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// Create a new buffer item consumer. The consumerUsage parameter determines
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// the consumer usage flags passed to the graphics allocator. The
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// bufferCount parameter specifies how many buffers can be locked for user
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// access at the same time.
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BufferItemConsumer(uint32_t consumerUsage,
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int bufferCount = BufferQueue::MIN_UNDEQUEUED_BUFFERS,
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bool synchronousMode = false);
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virtual ~BufferItemConsumer();
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// set the name of the BufferItemConsumer that will be used to identify it in
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// log messages.
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void setName(const String8& name);
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// Gets the next graphics buffer from the producer, filling out the
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// passed-in BufferItem structure. Returns NO_BUFFER_AVAILABLE if the queue
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// of buffers is empty, and INVALID_OPERATION if the maximum number of
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// buffers is already acquired.
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//
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// Only a fixed number of buffers can be acquired at a time, determined by
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// the construction-time bufferCount parameter. If INVALID_OPERATION is
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// returned by acquireBuffer, then old buffers must be returned to the
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// queue by calling releaseBuffer before more buffers can be acquired.
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//
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// If waitForFence is true, and the acquired BufferItem has a valid fence object,
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// acquireBuffer will wait on the fence with no timeout before returning.
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status_t acquireBuffer(BufferItem *item, bool waitForFence = true);
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// Returns an acquired buffer to the queue, allowing it to be reused. Since
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// only a fixed number of buffers may be acquired at a time, old buffers
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// must be released by calling releaseBuffer to ensure new buffers can be
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// acquired by acquireBuffer. Once a BufferItem is released, the caller must
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// not access any members of the BufferItem, and should immediately remove
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// all of its references to the BufferItem itself.
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status_t releaseBuffer(const BufferItem &item,
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const sp<Fence>& releaseFence = Fence::NO_FENCE);
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sp<ISurfaceTexture> getProducerInterface() const { return getBufferQueue(); }
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};
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} // namespace android
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#endif // ANDROID_GUI_CPUCONSUMER_H
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