libs/gui/SurfaceControl.cpp

/*
 * 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.
 */

#define LOG_TAG "SurfaceControl"

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

#include <android/native_window.h>

#include <utils/Errors.h>
#include <utils/KeyedVector.h>
#include <utils/Log.h>
#include <utils/threads.h>

#include <binder/IPCThreadState.h>

#include <ui/GraphicBuffer.h>
#include <ui/Rect.h>
#include <ui/StaticDisplayInfo.h>

#include <gui/BufferQueueCore.h>
#include <gui/BLASTBufferQueue.h>
#include <gui/ISurfaceComposer.h>
#include <gui/Surface.h>
#include <gui/SurfaceComposerClient.h>
#include <gui/SurfaceControl.h>
#include <private/gui/ParcelUtils.h>

namespace android {

// ============================================================================
//  SurfaceControl
// ============================================================================

SurfaceControl::SurfaceControl(const sp<SurfaceComposerClient>& client, const sp<IBinder>& handle,
                               int32_t layerId, const std::string& name, uint32_t w, uint32_t h,
                               PixelFormat format, uint32_t transform, uint32_t flags)
      : mClient(client),
        mHandle(handle),
        mLayerId(layerId),
        mName(name),
        mTransformHint(transform),
        mWidth(w),
        mHeight(h),
        mFormat(format),
        mCreateFlags(flags) {}

SurfaceControl::SurfaceControl(const sp<SurfaceControl>& other) {
    mClient = other->mClient;
    mHandle = other->mHandle;
    mTransformHint = other->mTransformHint;
    mLayerId = other->mLayerId;
    mName = other->mName;
    mWidth = other->mWidth;
    mHeight = other->mHeight;
    mFormat = other->mFormat;
    mCreateFlags = other->mCreateFlags;
}

SurfaceControl::~SurfaceControl()
{
    // Trigger an IPC now, to make sure things
    // happen without delay, since these resources are quite heavy.
    mClient.clear();
    mHandle.clear();
    mBbq.clear();
    IPCThreadState::self()->flushCommands();
}

void SurfaceControl::disconnect() {
    if (getIGraphicBufferProducer() != nullptr) {
        getIGraphicBufferProducer()->disconnect(
                BufferQueueCore::CURRENTLY_CONNECTED_API);
    }
}

bool SurfaceControl::isSameSurface(
        const sp<SurfaceControl>& lhs, const sp<SurfaceControl>& rhs)
{
    if (lhs == nullptr || rhs == nullptr)
        return false;
    return lhs->mHandle == rhs->mHandle;
}

status_t SurfaceControl::clearLayerFrameStats() const {
    status_t err = validate();
    if (err != NO_ERROR) return err;
    const sp<SurfaceComposerClient>& client(mClient);
    return client->clearLayerFrameStats(mHandle);
}

status_t SurfaceControl::getLayerFrameStats(FrameStats* outStats) const {
    status_t err = validate();
    if (err != NO_ERROR) return err;
    const sp<SurfaceComposerClient>& client(mClient);
    return client->getLayerFrameStats(mHandle, outStats);
}

status_t SurfaceControl::validate() const
{
    if (mHandle==nullptr || mClient==nullptr) {
        ALOGE("invalid handle (%p) or client (%p)",
                mHandle.get(), mClient.get());
        return NO_INIT;
    }
    return NO_ERROR;
}

status_t SurfaceControl::writeSurfaceToParcel(
        const sp<SurfaceControl>& control, Parcel* parcel)
{
    sp<IGraphicBufferProducer> bp;
    if (control != nullptr) {
        bp = control->getIGraphicBufferProducer();
    }
    return parcel->writeStrongBinder(IInterface::asBinder(bp));
}

sp<Surface> SurfaceControl::generateSurfaceLocked()
{
    uint32_t ignore;
    auto flags = mCreateFlags & (ISurfaceComposerClient::eCursorWindow |
                                 ISurfaceComposerClient::eOpaque);
    mBbqChild = mClient->createSurface(String8("bbq-wrapper"), 0, 0, mFormat,
                                       flags, mHandle, {}, &ignore);
    mBbq = sp<BLASTBufferQueue>::make("bbq-adapter", mBbqChild, mWidth, mHeight, mFormat);

    // This surface is always consumed by SurfaceFlinger, so the
    // producerControlledByApp value doesn't matter; using false.
    mSurfaceData = mBbq->getSurface(true);

    return mSurfaceData;
}

sp<Surface> SurfaceControl::getSurface()
{
    Mutex::Autolock _l(mLock);
    if (mSurfaceData == nullptr) {
        return generateSurfaceLocked();
    }
    return mSurfaceData;
}

sp<Surface> SurfaceControl::createSurface()
{
    return getSurface();
}

void SurfaceControl::updateDefaultBufferSize(uint32_t width, uint32_t height) {
    Mutex::Autolock _l(mLock);
    mWidth = width;
    mHeight = height;
    if (mBbq) {
        mBbq->update(mBbqChild, width, height, mFormat);
    }
}

sp<IBinder> SurfaceControl::getLayerStateHandle() const
{
    return mHandle;
}

sp<IBinder> SurfaceControl::getHandle() const {
    if (mBbqChild != nullptr) {
        return mBbqChild->getHandle();
    }
    return getLayerStateHandle();
}

int32_t SurfaceControl::getLayerId() const {
    return mLayerId;
}

const std::string& SurfaceControl::getName() const {
    return mName;
}

sp<IGraphicBufferProducer> SurfaceControl::getIGraphicBufferProducer()
{
    getSurface();
    Mutex::Autolock _l(mLock);

    return mBbq->getIGraphicBufferProducer();
}

sp<SurfaceComposerClient> SurfaceControl::getClient() const
{
    return mClient;
}

uint32_t SurfaceControl::getTransformHint() const {
    Mutex::Autolock _l(mLock);
    return mTransformHint;
}

void SurfaceControl::setTransformHint(uint32_t hint) {
    Mutex::Autolock _l(mLock);
    mTransformHint = hint;
}

status_t SurfaceControl::writeToParcel(Parcel& parcel) {
    SAFE_PARCEL(parcel.writeStrongBinder, ISurfaceComposerClient::asBinder(mClient->getClient()));
    SAFE_PARCEL(parcel.writeStrongBinder, mHandle);
    SAFE_PARCEL(parcel.writeInt32, mLayerId);
    SAFE_PARCEL(parcel.writeUtf8AsUtf16, mName);
    SAFE_PARCEL(parcel.writeUint32, mTransformHint);
    SAFE_PARCEL(parcel.writeUint32, mWidth);
    SAFE_PARCEL(parcel.writeUint32, mHeight);
    SAFE_PARCEL(parcel.writeUint32, mFormat);

    return NO_ERROR;
}

status_t SurfaceControl::readFromParcel(const Parcel& parcel,
                                        sp<SurfaceControl>* outSurfaceControl) {
    sp<IBinder> client;
    sp<IBinder> handle;
    int32_t layerId;
    std::string layerName;
    uint32_t transformHint;
    uint32_t width;
    uint32_t height;
    uint32_t format;

    SAFE_PARCEL(parcel.readStrongBinder, &client);
    SAFE_PARCEL(parcel.readStrongBinder, &handle);
    SAFE_PARCEL(parcel.readInt32, &layerId);
    SAFE_PARCEL(parcel.readUtf8FromUtf16, &layerName);
    SAFE_PARCEL(parcel.readUint32, &transformHint);
    SAFE_PARCEL(parcel.readUint32, &width);
    SAFE_PARCEL(parcel.readUint32, &height);
    SAFE_PARCEL(parcel.readUint32, &format);

    // We aren't the original owner of the surface.
    *outSurfaceControl = new SurfaceControl(new SurfaceComposerClient(
                                                    interface_cast<ISurfaceComposerClient>(client)),
                                            handle.get(), layerId, layerName, width, height, format,
                                            transformHint);

    return NO_ERROR;
}

status_t SurfaceControl::readNullableFromParcel(const Parcel& parcel,
                                                sp<SurfaceControl>* outSurfaceControl) {
    bool isNotNull;
    SAFE_PARCEL(parcel.readBool, &isNotNull);
    if (isNotNull) {
        SAFE_PARCEL(SurfaceControl::readFromParcel, parcel, outSurfaceControl);
    }

    return NO_ERROR;
}

status_t SurfaceControl::writeNullableToParcel(Parcel& parcel,
                                               const sp<SurfaceControl>& surfaceControl) {
    auto isNotNull = surfaceControl != nullptr;
    SAFE_PARCEL(parcel.writeBool, isNotNull);
    if (isNotNull) {
        SAFE_PARCEL(surfaceControl->writeToParcel, parcel);
    }

    return NO_ERROR;
}

sp<SurfaceControl> SurfaceControl::getParentingLayer() {
    if (mBbqChild != nullptr) {
        return mBbqChild;
    }
    return this;
}

uint64_t SurfaceControl::resolveFrameNumber(const std::optional<uint64_t>& frameNumber) {
    if (frameNumber.has_value()) {
        auto ret = frameNumber.value();
        // Set the fallback to something far enough ahead that in the unlikely event of mixed
        // "real" frame numbers and fallback frame numbers, we still won't collide in any
        // meaningful capacity
        mFallbackFrameNumber = ret + 100;
        return ret;
    } else {
        return mFallbackFrameNumber++;
    }
}

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