gdmp/displaywind.cpp

#include "displaywind.h"
#include "ui_displaywind.h"
#include <QDebug>
#include <QPainter>
DisplayWind::DisplayWind(QWidget *parent) :
    QWidget(parent),
    ui(new Ui::DisplayWind),
    bIsFull_(false)
    // stParentWidget_(parent)
{
    ui->setupUi(this);
    win_width_ = width();
    win_height_ = height();
    memset(&dst_video_frame_, sizeof(VideoFrame), 0);
    play_state_ = 2;
}

DisplayWind::~DisplayWind()
{
    QMutexLocker locker(&m_mutex);
    delete ui;
    DeInit();
}

int DisplayWind::Draw(const Frame *frame)
{
    QMutexLocker locker(&m_mutex);
    if(!img_scaler_ || req_resize_) {
        if(img_scaler_) {
            DeInit();
        }
        win_width_ = width();
        win_height_ = height();
        video_width = frame->width;
        video_height = frame->height;
        img_scaler_ = new ImageScaler();
        double video_aspect_ratio = frame->width * 1.0 / frame->height;
        double win_aspect_ratio = win_width_ * 1.0 / win_height_;
        if(win_aspect_ratio > video_aspect_ratio) {
            //此时应该是调整x的起始位置，以高度为基准
            img_height = win_height_;
            img_height &= 0xfffc;
            img_width = img_height * video_aspect_ratio;
            img_width &= 0xfffc;
            y_ = 0;
            x_ = (win_width_ - img_width) / 2;
        } else {
            //此时应该是调整y的起始位置，以宽度为基准
            img_width = win_width_;
            img_width &= 0xfffc;
            img_height = img_width / video_aspect_ratio;
            img_height &= 0xfffc;
            x_ = 0;
            y_ = (win_height_ - img_height) / 2;
        }
        img_scaler_->Init(video_width, video_height, frame->format,
                          img_width, img_height, AV_PIX_FMT_RGB24);
        memset(&dst_video_frame_, 0, sizeof(VideoFrame));
        dst_video_frame_.width = img_width;
        dst_video_frame_.height = img_height;
        dst_video_frame_.format = AV_PIX_FMT_RGB24;
        dst_video_frame_.data[0] = (uint8_t*)malloc(img_width * img_height * 3);
        dst_video_frame_.linesize[0] = img_width * 3; // 每行的字节数
        req_resize_ = false;
    }
    img_scaler_->Scale3(frame, &dst_video_frame_);
    QImage imageTmp =  QImage((uint8_t *)dst_video_frame_.data[0],
                              img_width, img_height, QImage::Format_RGB888);
    img = imageTmp.copy(0, 0, img_width, img_height);
    update();
    //    repaint();
    return 0;
}

void DisplayWind::DeInit()
{
    if(dst_video_frame_.data[0]) {
        free(dst_video_frame_.data[0]);
        dst_video_frame_.data[0] = NULL;
    }
    if(img_scaler_) {
        delete img_scaler_;
        img_scaler_ = NULL;
    }
}

void DisplayWind::StartPlay()
{
    QMutexLocker locker(&m_mutex);
    play_state_ = 1;
}

void DisplayWind::StopPlay()
{
    QMutexLocker locker(&m_mutex);
    play_state_ = 2;
    update();
}

void DisplayWind::onToggleFullScreen(bool full)
{
    if (full && !bIsFull_) {
        enterFullScreen();
    }
    else if (!full && bIsFull_) {
        exitFullScreen();
    }
}

void DisplayWind::enterFullScreen()
{
    if (bIsFull_)
        return;

    bIsFull_ = true;
    nWinHeightBack_ = height();
    nWinWidthBack_ = width();
    stParentWidget_ = this->parentWidget();

    if (stParentWidget_) {
        stParentLayout_ = qobject_cast<QBoxLayout*>(stParentWidget_->layout());
        if (stParentLayout_) {
            nParentLayoutIndex_ = stParentLayout_->indexOf(this);
            stParentLayout_->removeWidget(this);
        }
        else {
            stOriginalGeometry_ = geometry();
        }
        setParent(nullptr);
    }
    setWindowFlags(Qt::Window);
    showFullScreen();

    setFocus();

    emit signalFullScreenChanged();
}

void DisplayWind::exitFullScreen()
{

    if (!bIsFull_)
        return;

    bIsFull_ = false;
    setWindowFlags(Qt::Widget);
    hide();

    if (stParentWidget_) {
        setParent(stParentWidget_);

        if (stParentLayout_ && nParentLayoutIndex_ >= 0) {
            LOG(DEBUG)<< "insertWidget";
            stParentLayout_->insertWidget(nParentLayoutIndex_, this);
        }
        else if (!stOriginalGeometry_.isNull()) {
            LOG(DEBUG)<< "setGeometry";
            setGeometry(stOriginalGeometry_);
        }
    }
    resize(nWinWidthBack_, nWinHeightBack_);
    show();
    setFocus();
    stParentLayout_ = nullptr;
    nParentLayoutIndex_ = 0;
    stOriginalGeometry_ = QRect();

    emit signalFullScreenChanged();
}


void DisplayWind::paintEvent(QPaintEvent *)
{
    QMutexLocker locker(&m_mutex);
    if(play_state_ == 1) {  // 播放状态
        if (img.isNull()) {
            return;
        }
        QPainter painter(this);
        painter.setRenderHints(QPainter::Antialiasing | QPainter::SmoothPixmapTransform);
        //    //    p.translate(X, Y);
        //    //    p.drawImage(QRect(0, 0, W, H), img);
        QRect rect = QRect(x_, y_, img.width(), img.height());
        //        qDebug() << rect << ", win_w:" << this->width() << ", h:" << this->height();
        painter.drawImage(rect, img.scaled(img.width(), img.height()));
    } else if(play_state_ == 2) {
        QPainter p(this);
        p.setPen(Qt::NoPen);
        p.setBrush(Qt::black);
        p.drawRect(rect());
    }
}

void DisplayWind::resizeEvent(QResizeEvent *event)
{
    QMutexLocker locker(&m_mutex);
    if(win_width_ != width() || win_height_ != height()) {
        //        DeInit();       // 释放尺寸缩放资源，等下一次draw的时候重新初始化
        //        win_width = width();
        //        win_height = height();
        req_resize_ = true;
    }
}

void DisplayWind::keyPressEvent(QKeyEvent *event)
{
    if (bIsFull_) {
        if (event->key() == Qt::Key_Escape) {
            exitFullScreen();
            event->accept();
            return;
        }
    }
}