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/*
* Copyright (C) 2018 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 <gui/BufferQueueDefs.h>
#include <SkImage.h>
#include <cutils/compiler.h>
#include <gui/BufferItem.h>
#include <system/graphics.h>
namespace android {
namespace uirenderer {
class RenderState;
}
class AutoBackendTextureRelease;
class SurfaceTexture;
/*
* ImageConsumer implements the parts of SurfaceTexture that deal with
* images consumed by HWUI view system.
*/
class ImageConsumer {
public:
sk_sp<SkImage> dequeueImage(bool* queueEmpty, SurfaceTexture& cb,
uirenderer::RenderState& renderState);
/**
* onAcquireBufferLocked amends the ConsumerBase method to update the
* mImageSlots array in addition to the ConsumerBase behavior.
*/
void onAcquireBufferLocked(BufferItem* item);
/**
* onReleaseBufferLocked amends the ConsumerBase method to update the
* mImageSlots array in addition to the ConsumerBase.
*/
void onReleaseBufferLocked(int slot);
/**
* onFreeBufferLocked frees up the given buffer slot. If the slot has been
* initialized this will release the reference to the GraphicBuffer in that
* slot and destroy the SkImage in that slot. Otherwise it has no effect.
*/
void onFreeBufferLocked(int slotIndex);
private:
/**
* ImageSlot contains the information and object references that
* ImageConsumer maintains about a BufferQueue buffer slot.
*/
class ImageSlot {
public:
ImageSlot() : mDataspace(HAL_DATASPACE_UNKNOWN), mEglFence(EGL_NO_SYNC_KHR) {}
~ImageSlot() { clear(); }
void createIfNeeded(sp<GraphicBuffer> graphicBuffer, android_dataspace dataspace,
bool forceCreate, GrContext* context);
void clear();
inline EGLSyncKHR& eglFence() { return mEglFence; }
sk_sp<SkImage> getImage();
private:
// the dataspace associated with the current image
android_dataspace mDataspace;
/**
* mEglFence is the EGL sync object that must signal before the buffer
* associated with this buffer slot may be dequeued.
*/
EGLSyncKHR mEglFence;
/**
* mTextureRelease may outlive ImageConsumer, if the last ref is held by an SkImage.
* ImageConsumer holds one ref to mTextureRelease, which is decremented by "clear".
*/
AutoBackendTextureRelease* mTextureRelease = nullptr;
};
/**
* 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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