automotive/evs/1.1/default/EvsDisplay.h

/*
 * Copyright (C) 2016 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_HARDWARE_AUTOMOTIVE_EVS_V1_1_EVSDISPLAY_H
#define ANDROID_HARDWARE_AUTOMOTIVE_EVS_V1_1_EVSDISPLAY_H

#include <android/hardware/automotive/evs/1.0/IEvsDisplay.h>
#include <ui/GraphicBuffer.h>

using ::android::hardware::automotive::evs::V1_0::IEvsDisplay;
using ::android::hardware::automotive::evs::V1_0::DisplayDesc;
using ::android::hardware::automotive::evs::V1_0::DisplayState;
using ::android::hardware::automotive::evs::V1_0::EvsResult;
using BufferDesc_1_0 = ::android::hardware::automotive::evs::V1_0::BufferDesc;

namespace android {
namespace hardware {
namespace automotive {
namespace evs {
namespace V1_1 {
namespace implementation {


class EvsDisplay : public IEvsDisplay {
public:
    // Methods from ::android::hardware::automotive::evs::V1_0::IEvsDisplay follow.
    Return<void>         getDisplayInfo(getDisplayInfo_cb _hidl_cb)  override;
    Return<EvsResult>    setDisplayState(DisplayState state)  override;
    Return<DisplayState> getDisplayState()  override;
    Return<void>         getTargetBuffer(getTargetBuffer_cb _hidl_cb)  override;
    Return<EvsResult>    returnTargetBufferForDisplay(const BufferDesc_1_0& buffer)  override;


    // Implementation details
    EvsDisplay();
    virtual ~EvsDisplay() override;

    void forceShutdown();   // This gets called if another caller "steals" ownership of the display
    Return<EvsResult> returnTargetBufferForDisplayImpl(const uint32_t bufferId,
                                                       const buffer_handle_t memHandle);

private:
    DisplayDesc     mInfo           = {};
    BufferDesc_1_0  mBuffer         = {};       // A graphics buffer into which we'll store images

    bool            mFrameBusy      = false;    // A flag telling us our buffer is in use
    DisplayState    mRequestedState = DisplayState::NOT_VISIBLE;

    std::mutex      mAccessLock;
};

} // namespace implementation
} // namespace V1_1
} // namespace evs
} // namespace automotive
} // namespace hardware
} // namespace android

#endif  // ANDROID_HARDWARE_AUTOMOTIVE_EVS_V1_1_EVSDISPLAY_H