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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
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* See the License for the specific language governing permissions and
* limitations under the License.
#include <gui/ConsumerBase.h>
#include <ui/GraphicBuffer.h>
#include <utils/String8.h>
#include <utils/Vector.h>
#include <utils/threads.h>
namespace android {
* 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
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;
uint64_t frameNumber;
// Create a new CPU consumer. The maxLockedBuffers parameter specifies
// how many buffers can be locked for user access at the same time.
CpuConsumer(uint32_t maxLockedBuffers);
virtual ~CpuConsumer();
// set the name of the CpuConsumer that will be used to identify it in
// log messages.
void setName(const String8& name);
// 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
// INVALID_OPERATION 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);
sp<ISurfaceTexture> getProducerInterface() const { return getBufferQueue(); }
// Maximum number of buffers that can be locked at a time
uint32_t mMaxLockedBuffers;
virtual void freeBufferLocked(int slotIndex);
// Array for tracking pointers passed to the consumer, matching the
// mSlots indexing
void *mBufferPointers[BufferQueue::NUM_BUFFER_SLOTS];
// Count of currently locked buffers
uint32_t mCurrentLockedBuffers;
} // namespace android