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131 lines
4.6 KiB
131 lines
4.6 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_CPUCONSUMER_H
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#define ANDROID_GUI_CPUCONSUMER_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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namespace android {
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class BufferQueue;
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/**
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* CpuConsumer is a BufferQueue consumer endpoint that allows direct CPU
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* access to the underlying gralloc buffers provided by BufferQueue. Multiple
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* buffers may be acquired by it at once, to be used concurrently by the
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* CpuConsumer owner. Sets gralloc usage flags to be software-read-only.
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* This queue is synchronous by default.
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*/
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class CpuConsumer : public ConsumerBase
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{
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public:
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typedef ConsumerBase::FrameAvailableListener FrameAvailableListener;
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struct LockedBuffer {
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uint8_t *data;
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uint32_t width;
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uint32_t height;
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PixelFormat format;
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uint32_t stride;
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Rect crop;
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uint32_t transform;
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uint32_t scalingMode;
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int64_t timestamp;
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android_dataspace dataSpace;
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uint64_t frameNumber;
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// this is the same as format, except for formats that are compatible with
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// a flexible format (e.g. HAL_PIXEL_FORMAT_YCbCr_420_888). In the latter
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// case this contains that flexible format
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PixelFormat flexFormat;
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// Values below are only valid when using HAL_PIXEL_FORMAT_YCbCr_420_888
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// or compatible format, in which case LockedBuffer::data
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// contains the Y channel, and stride is the Y channel stride. For other
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// formats, these will all be 0.
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uint8_t *dataCb;
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uint8_t *dataCr;
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uint32_t chromaStride;
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uint32_t chromaStep;
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};
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// Create a new CPU consumer. The maxLockedBuffers parameter specifies
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// how many buffers can be locked for user access at the same time.
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CpuConsumer(const sp<IGraphicBufferConsumer>& bq,
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size_t maxLockedBuffers, bool controlledByApp = false);
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virtual ~CpuConsumer();
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// set the name of the CpuConsumer 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 and locks it for CPU use,
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// filling out the passed-in locked buffer structure with the native pointer
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// and metadata. Returns BAD_VALUE if no new buffer is available, and
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// NOT_ENOUGH_DATA if the maximum number of buffers is already locked.
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//
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// Only a fixed number of buffers can be locked at a time, determined by the
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// construction-time maxLockedBuffers parameter. If INVALID_OPERATION is
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// returned by lockNextBuffer, then old buffers must be returned to the queue
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// by calling unlockBuffer before more buffers can be acquired.
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status_t lockNextBuffer(LockedBuffer *nativeBuffer);
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// Returns a locked buffer to the queue, allowing it to be reused. Since
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// only a fixed number of buffers may be locked at a time, old buffers must
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// be released by calling unlockBuffer to ensure new buffers can be acquired by
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// lockNextBuffer.
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status_t unlockBuffer(const LockedBuffer &nativeBuffer);
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private:
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// Maximum number of buffers that can be locked at a time
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size_t mMaxLockedBuffers;
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status_t releaseAcquiredBufferLocked(size_t lockedIdx);
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virtual void freeBufferLocked(int slotIndex);
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// Tracking for buffers acquired by the user
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struct AcquiredBuffer {
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// Need to track the original mSlot index and the buffer itself because
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// the mSlot entry may be freed/reused before the acquired buffer is
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// released.
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int mSlot;
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sp<GraphicBuffer> mGraphicBuffer;
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void *mBufferPointer;
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AcquiredBuffer() :
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mSlot(BufferQueue::INVALID_BUFFER_SLOT),
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mBufferPointer(NULL) {
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}
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};
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Vector<AcquiredBuffer> mAcquiredBuffers;
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// Count of currently locked buffers
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size_t mCurrentLockedBuffers;
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};
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} // namespace android
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#endif // ANDROID_GUI_CPUCONSUMER_H
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