services/automotive/display/CarWindowService.cpp

//
// Copyright (C) 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.
//

#include <utility>

#include <gui/bufferqueue/2.0/B2HGraphicBufferProducer.h>
#include <ui/DisplayConfig.h>
#include <ui/DisplayState.h>

#include "CarWindowService.h"

namespace android {
namespace frameworks {
namespace automotive {
namespace display {
namespace V1_0 {
namespace implementation {

Return<sp<IGraphicBufferProducer>>
    CarWindowService::getIGraphicBufferProducer() {
    if (mSurface == nullptr) {
        status_t err;
        mSurfaceComposerClient = new SurfaceComposerClient();

        err = mSurfaceComposerClient->initCheck();
        if (err != NO_ERROR) {
            ALOGE("SurfaceComposerClient::initCheck error: %#x", err);
            mSurfaceComposerClient = nullptr;
            return nullptr;
        }

        const auto displayToken = SurfaceComposerClient::getInternalDisplayToken();
        if (displayToken == nullptr) {
            ALOGE("Failed to get internal display ");
            return nullptr;
        }

        DisplayConfig displayConfig;
        err = SurfaceComposerClient::getActiveDisplayConfig(displayToken, &displayConfig);
        if (err != NO_ERROR) {
            ALOGE("Failed to get active display config");
            return nullptr;
        }

        ui::DisplayState displayState;
        err = SurfaceComposerClient::getDisplayState(displayToken, &displayState);
        if (err != NO_ERROR) {
            ALOGE("Failed to get display state");
            return nullptr;
        }

        const ui::Size& resolution = displayConfig.resolution;
        auto width = resolution.getWidth();
        auto height = resolution.getHeight();

        if (displayState.orientation == ui::ROTATION_90 ||
            displayState.orientation == ui::ROTATION_270) {
            std::swap(width, height);
        }

        mSurfaceControl = mSurfaceComposerClient->createSurface(
                String8("Automotive Display"), width, height,
                PIXEL_FORMAT_RGBX_8888, ISurfaceComposerClient::eOpaque);
        if (mSurfaceControl == nullptr || !mSurfaceControl->isValid()) {
            ALOGE("Failed to create SurfaceControl");
            mSurfaceComposerClient = nullptr;
            mSurfaceControl = nullptr;
            return nullptr;
        }

        // SurfaceControl::getSurface is guaranteed to be not null.
        mSurface = mSurfaceControl->getSurface();
    }

    return new ::android::hardware::graphics::bufferqueue::V2_0::utils::
                    B2HGraphicBufferProducer(
                        mSurface->getIGraphicBufferProducer());
}

Return<bool> CarWindowService::showWindow() {
    status_t status = NO_ERROR;

    if (mSurfaceControl != nullptr) {
        status = SurfaceComposerClient::Transaction{}
                         .setLayer(
                             mSurfaceControl, 0x7FFFFFFF) // always on top
                         .show(mSurfaceControl)
                         .apply();
    } else {
        ALOGE("showWindow: Failed to get a valid SurfaceControl!");
        return false;
    }

    return status == NO_ERROR;
}

Return<bool> CarWindowService::hideWindow() {
    status_t status = NO_ERROR;

    if (mSurfaceControl != nullptr) {
        status = SurfaceComposerClient::Transaction{}
                        .hide(mSurfaceControl)
                        .apply();
    } else {
        ALOGE("hideWindow: Failed to get a valid SurfaceControl!");
        return false;
    }

    return status == NO_ERROR;
}

}  // namespace implementation
}  // namespace V1_0
}  // namespace display
}  // namespace automotive
}  // namespace frameworks
}  // namespace android