595264f1af
this is the first step of a series of improvements to
BufferQueue. A few things happen in this change:
- setSynchronousMode() goes away as well as the SynchronousModeAllowed flag
- BufferQueue now defaults to (what used to be) synchronous mode
- a new "controlled by app" flag is passed when creating consumers and producers
those flags are used to put the BufferQueue in a mode where it
will never block if both flags are set. This is achieved by:
- returning an error from dequeueBuffer() if it would block
- making sure a buffer is always available by replacing
the previous buffer with the new one in queueBuffer()
(note: this is similar to what asynchrnous mode used to be)
Note: in this change EGL's swap-interval 0 is broken; this will be
fixed in another change.
Change-Id: I691f9507d6e2e158287e3039f2a79a4d4434211d
141 lines
5.0 KiB
C++
141 lines
5.0 KiB
C++
/*
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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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uint64_t frameNumber;
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// Values below are only valid when using
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// HAL_PIXEL_FORMAT_YCbCr_420_888, 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<BufferQueue>& bq,
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uint32_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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// setDefaultBufferSize is used to set the size of buffers returned by
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// requestBuffers when a width and height of zero is requested.
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// A call to setDefaultBufferSize() may trigger requestBuffers() to
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// be called from the client. Default size is 1x1.
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status_t setDefaultBufferSize(uint32_t width, uint32_t height);
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// setDefaultBufferFormat allows CpuConsumer's BufferQueue to create buffers
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// of a defaultFormat if no format is specified by producer. Formats are
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// enumerated in graphics.h; the initial default is
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// HAL_PIXEL_FORMAT_RGBA_8888.
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status_t setDefaultBufferFormat(uint32_t defaultFormat);
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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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// INVALID_OPERATION 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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sp<IGraphicBufferProducer> getProducerInterface() const { return getBufferQueue(); }
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private:
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// Maximum number of buffers that can be locked at a time
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uint32_t mMaxLockedBuffers;
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status_t releaseAcquiredBufferLocked(int 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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uint32_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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