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/*
* 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_CPUCONSUMER_H
#define ANDROID_GUI_CPUCONSUMER_H
#include <system/window.h>
#include <gui/ConsumerBase.h>
#include <gui/BufferQueue.h>
#include <utils/Vector.h>
namespace android {
class BufferQueue;
class GraphicBuffer;
class String8;
/**
* CpuConsumer is a BufferQueue consumer endpoint that allows direct CPU
* access to the underlying gralloc buffers provided by BufferQueue. Multiple
* buffers may be acquired by it at once, to be used concurrently by the
* CpuConsumer owner. Sets gralloc usage flags to be software-read-only.
* This queue is synchronous by default.
*/
class CpuConsumer : public ConsumerBase
{
public:
typedef ConsumerBase::FrameAvailableListener FrameAvailableListener;
struct LockedBuffer {
uint8_t *data;
uint32_t width;
uint32_t height;
PixelFormat format;
uint32_t stride;
Rect crop;
uint32_t transform;
uint32_t scalingMode;
int64_t timestamp;
android_dataspace dataSpace;
uint64_t frameNumber;
// this is the same as format, except for formats that are compatible with
// a flexible format (e.g. HAL_PIXEL_FORMAT_YCbCr_420_888). In the latter
// case this contains that flexible format
PixelFormat flexFormat;
// Values below are only valid when using HAL_PIXEL_FORMAT_YCbCr_420_888
// or compatible format, in which case LockedBuffer::data
// contains the Y channel, and stride is the Y channel stride. For other
// formats, these will all be 0.
uint8_t *dataCb;
uint8_t *dataCr;
uint32_t chromaStride;
uint32_t chromaStep;
LockedBuffer() :
data(nullptr),
width(0),
height(0),
format(PIXEL_FORMAT_NONE),
stride(0),
crop(Rect::EMPTY_RECT),
transform(0),
scalingMode(NATIVE_WINDOW_SCALING_MODE_FREEZE),
timestamp(0),
dataSpace(HAL_DATASPACE_UNKNOWN),
frameNumber(0),
flexFormat(PIXEL_FORMAT_NONE),
dataCb(nullptr),
dataCr(nullptr),
chromaStride(0),
chromaStep(0)
{}
};
// Create a new CPU consumer. The maxLockedBuffers parameter specifies
// how many buffers can be locked for user access at the same time.
CpuConsumer(const sp<IGraphicBufferConsumer>& bq,
size_t maxLockedBuffers, bool controlledByApp = false);
// Gets the next graphics buffer from the producer and locks it for CPU use,
// filling out the passed-in locked buffer structure with the native pointer
// and metadata. Returns BAD_VALUE if no new buffer is available, and
// NOT_ENOUGH_DATA if the maximum number of buffers is already locked.
//
// Only a fixed number of buffers can be locked at a time, determined by the
// construction-time maxLockedBuffers parameter. If INVALID_OPERATION is
// returned by lockNextBuffer, then old buffers must be returned to the queue
// by calling unlockBuffer before more buffers can be acquired.
status_t lockNextBuffer(LockedBuffer *nativeBuffer);
// Returns a locked buffer to the queue, allowing it to be reused. Since
// only a fixed number of buffers may be locked at a time, old buffers must
// be released by calling unlockBuffer to ensure new buffers can be acquired by
// lockNextBuffer.
status_t unlockBuffer(const LockedBuffer &nativeBuffer);
private:
// Maximum number of buffers that can be locked at a time
const size_t mMaxLockedBuffers;
// Tracking for buffers acquired by the user
struct AcquiredBuffer {
static constexpr uintptr_t kUnusedId = 0;
// Need to track the original mSlot index and the buffer itself because
// the mSlot entry may be freed/reused before the acquired buffer is
// released.
int mSlot;
sp<GraphicBuffer> mGraphicBuffer;
uintptr_t mLockedBufferId;
AcquiredBuffer() :
mSlot(BufferQueue::INVALID_BUFFER_SLOT),
mLockedBufferId(kUnusedId) {
}
void reset() {
mSlot = BufferQueue::INVALID_BUFFER_SLOT;
mGraphicBuffer.clear();
mLockedBufferId = kUnusedId;
}
};
size_t findAcquiredBufferLocked(uintptr_t id) const;
status_t lockBufferItem(const BufferItem& item, LockedBuffer* outBuffer) const;
Vector<AcquiredBuffer> mAcquiredBuffers;
// Count of currently locked buffers
size_t mCurrentLockedBuffers;
};
} // namespace android
#endif // ANDROID_GUI_CPUCONSUMER_H