services/surfaceflinger/DisplayHardware/FramebufferSurface.h

/*
 * Copyright (C) 2007 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_SF_FRAMEBUFFER_SURFACE_H
#define ANDROID_SF_FRAMEBUFFER_SURFACE_H

#include "DisplaySurface.h"

#include <stdint.h>
#include <sys/types.h>

#include <gui/ConsumerBase.h>

#include <memory>

// ---------------------------------------------------------------------------
namespace android {
// ---------------------------------------------------------------------------

class Rect;
class String8;
class HWComposer;
class HWComposerBufferCache;

// ---------------------------------------------------------------------------

class FramebufferSurface : public ConsumerBase,
                           public DisplaySurface {
public:
    FramebufferSurface(HWComposer& hwc, int disp, const sp<IGraphicBufferConsumer>& consumer);

    virtual status_t beginFrame(bool mustRecompose);
    virtual status_t prepareFrame(CompositionType compositionType);
#ifndef USE_HWC2
    virtual status_t compositionComplete();
#endif
    virtual status_t advanceFrame();
    virtual void onFrameCommitted();
    virtual void dumpAsString(String8& result) const;

    // Cannot resize a buffers in a FramebufferSurface. Only works with virtual
    // displays.
    virtual void resizeBuffers(const uint32_t /*w*/, const uint32_t /*h*/) { };

    virtual const sp<Fence>& getClientTargetAcquireFence() const override;

private:
    virtual ~FramebufferSurface() { }; // this class cannot be overloaded

#ifndef USE_HWC2
    virtual void onFrameAvailable(const BufferItem& item);
#endif
    virtual void freeBufferLocked(int slotIndex);

    virtual void dumpLocked(String8& result, const char* prefix) const;

    // nextBuffer waits for and then latches the next buffer from the
    // BufferQueue and releases the previously latched buffer to the
    // BufferQueue.  The new buffer is returned in the 'buffer' argument.
#ifdef USE_HWC2
    status_t nextBuffer(uint32_t& outSlot, sp<GraphicBuffer>& outBuffer,
            sp<Fence>& outFence, android_dataspace_t& outDataspace);
#else
    status_t nextBuffer(sp<GraphicBuffer>& outBuffer, sp<Fence>& outFence);
#endif

    // mDisplayType must match one of the HWC display types
    int mDisplayType;

    // mCurrentBufferIndex is the slot index of the current buffer or
    // INVALID_BUFFER_SLOT to indicate that either there is no current buffer
    // or the buffer is not associated with a slot.
    int mCurrentBufferSlot;

    // mCurrentBuffer is the current buffer or NULL to indicate that there is
    // no current buffer.
    sp<GraphicBuffer> mCurrentBuffer;

    // mCurrentFence is the current buffer's acquire fence
    sp<Fence> mCurrentFence;

    // Hardware composer, owned by SurfaceFlinger.
    HWComposer& mHwc;

#ifdef USE_HWC2
    std::unique_ptr<HWComposerBufferCache> mHwcBufferCache =
        std::make_unique<HWComposerBufferCache>();

    // Previous buffer to release after getting an updated retire fence
    bool mHasPendingRelease;
    int mPreviousBufferSlot;
    sp<GraphicBuffer> mPreviousBuffer;
#endif
};

// ---------------------------------------------------------------------------
}; // namespace android
// ---------------------------------------------------------------------------

#endif // ANDROID_SF_FRAMEBUFFER_SURFACE_H