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/*
* Copyright 2019 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.
*/
#pragma once
#include <EGL/egl.h>
#include <EGL/eglext.h>
#include <cutils/compiler.h>
#include <gui/BufferItem.h>
#include <gui/BufferQueueDefs.h>
#include <sys/cdefs.h>
#include <system/graphics.h>
namespace android {
class SurfaceTexture;
class DequeueBufferCallbacks;
/*
* ImageConsumer implements the parts of SurfaceTexture that deal with
* images consumed by HWUI view system.
*/
class ImageConsumer {
public:
typedef status_t (*SurfaceTexture_createReleaseFence)(bool useFenceSync, EGLSyncKHR* eglFence,
EGLDisplay* display, int* releaseFence,
void* fencePassThroughHandle);
typedef status_t (*SurfaceTexture_fenceWait)(int fence, void* fencePassThroughHandle);
sp<GraphicBuffer> dequeueBuffer(int* outSlotid, android_dataspace* outDataspace,
HdrMetadata* outHdrMetadata, bool* outQueueEmpty,
SurfaceTexture& cb,
SurfaceTexture_createReleaseFence createFence,
SurfaceTexture_fenceWait fenceWait,
void* fencePassThroughHandle);
/**
* onReleaseBufferLocked amends the ConsumerBase method to update the
* mImageSlots array in addition to the ConsumerBase.
*/
void onReleaseBufferLocked(int slot);
private:
/**
* ImageSlot contains the information and object references that
* ImageConsumer maintains about a BufferQueue buffer slot.
*/
class ImageSlot {
public:
ImageSlot() : mEglFence(EGL_NO_SYNC_KHR) {}
inline EGLSyncKHR& eglFence() { return mEglFence; }
private:
/**
* mEglFence is the EGL sync object that must signal before the buffer
* associated with this buffer slot may be dequeued.
*/
EGLSyncKHR mEglFence;
};
/**
* ImageConsumer stores the SkImages that have been allocated by the BufferQueue
* for each buffer slot. It is initialized to null pointers, and gets
* filled in with the result of BufferQueue::acquire when the
* client dequeues a buffer from a
* slot that has not yet been used. The buffer allocated to a slot will also
* be replaced if the requested buffer usage or geometry differs from that
* of the buffer allocated to a slot.
*/
ImageSlot mImageSlots[BufferQueueDefs::NUM_BUFFER_SLOTS];
};
} /* namespace android */
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