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89 lines
3.7 KiB
89 lines
3.7 KiB
/*
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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_BUFFERQUEUE_H
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#define ANDROID_GUI_BUFFERQUEUE_H
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#include <gui/BufferItem.h>
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#include <gui/BufferQueueDefs.h>
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#include <gui/IGraphicBufferConsumer.h>
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#include <gui/IGraphicBufferProducer.h>
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#include <gui/IConsumerListener.h>
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// These are only required to keep other parts of the framework with incomplete
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// dependencies building successfully
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#include <gui/IGraphicBufferAlloc.h>
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namespace android {
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class BufferQueue {
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public:
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// BufferQueue will keep track of at most this value of buffers.
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// Attempts at runtime to increase the number of buffers past this will fail.
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enum { NUM_BUFFER_SLOTS = BufferQueueDefs::NUM_BUFFER_SLOTS };
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// Used as a placeholder slot# when the value isn't pointing to an existing buffer.
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enum { INVALID_BUFFER_SLOT = BufferItem::INVALID_BUFFER_SLOT };
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// Alias to <IGraphicBufferConsumer.h> -- please scope from there in future code!
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enum {
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NO_BUFFER_AVAILABLE = IGraphicBufferConsumer::NO_BUFFER_AVAILABLE,
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PRESENT_LATER = IGraphicBufferConsumer::PRESENT_LATER,
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};
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// When in async mode we reserve two slots in order to guarantee that the
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// producer and consumer can run asynchronously.
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enum { MAX_MAX_ACQUIRED_BUFFERS = NUM_BUFFER_SLOTS - 2 };
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// for backward source compatibility
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typedef ::android::ConsumerListener ConsumerListener;
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// ProxyConsumerListener is a ConsumerListener implementation that keeps a weak
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// reference to the actual consumer object. It forwards all calls to that
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// consumer object so long as it exists.
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//
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// This class exists to avoid having a circular reference between the
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// BufferQueue object and the consumer object. The reason this can't be a weak
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// reference in the BufferQueue class is because we're planning to expose the
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// consumer side of a BufferQueue as a binder interface, which doesn't support
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// weak references.
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class ProxyConsumerListener : public BnConsumerListener {
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public:
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ProxyConsumerListener(const wp<ConsumerListener>& consumerListener);
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virtual ~ProxyConsumerListener();
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virtual void onFrameAvailable(const BufferItem& item) override;
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virtual void onFrameReplaced(const BufferItem& item) override;
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virtual void onBuffersReleased() override;
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virtual void onSidebandStreamChanged() override;
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private:
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// mConsumerListener is a weak reference to the IConsumerListener. This is
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// the raison d'etre of ProxyConsumerListener.
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wp<ConsumerListener> mConsumerListener;
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};
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// BufferQueue manages a pool of gralloc memory slots to be used by
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// producers and consumers. allocator is used to allocate all the
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// needed gralloc buffers.
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static void createBufferQueue(sp<IGraphicBufferProducer>* outProducer,
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sp<IGraphicBufferConsumer>* outConsumer,
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const sp<IGraphicBufferAlloc>& allocator = NULL);
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private:
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BufferQueue(); // Create through createBufferQueue
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};
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// ----------------------------------------------------------------------------
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}; // namespace android
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#endif // ANDROID_GUI_BUFFERQUEUE_H
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