Question

我显示视频的方法如下：

当新图像准备好时，调用DrawImage，窗口也准备好显示。我在调用此函数之前使用bool isReady设置为false 并在mainwindow paintEvent覆盖中设置为true。（决定窗户是否准备好了）

void Mainview::DrawImage (char *pBuffer)
{
    lockBuffer();
    QImage image = getImageFromBuffer(); //1920x1080 RGB_888 image
    paintLabel->setImage(image); //PaintLabel pointer
    unlockBuffer();
}

void Mainview::paintEvent (QPaintEvent *e)
{
    Q_UNUSED(e);
    m_bReady = TRUE;
}

PaintLabel实现（重要部分）：

void PaintLabel::setImage(QImage &image)
{
    imageData = image.scaled(this->width(), this->height()); //private QImage
    update();
}

void PaintLabel::paintEvent(QPaintEvent *ev)
{
    Q_UNUSED(ev);

    if (!m_Image.isNull())
    {
        if (isScale)
        {
        m_Image.scaled(this->width(), this->height());
        }

        QRectF target(0.0, 0.0, m_Image.width(), m_Image.height());

        // Alignment draw
        if (this->alignment() & Qt::AlignCenter)
        {
            qreal posX = this->width() / 2 - m_Image.width() / 2;
            qreal posY = this->height() / 2 - m_Image.height() / 2;
            target.setRect(posX, posY, m_Image.width(), m_Image.height());
        }

        // draw the image
        QPainter painter(this);
        painter.drawImage(target, imageData);
        painter.end();
    }
}

DrawImage调用花费了近100毫秒，这太过分了。任何想法，如何解决这个问题？

Qt QLabel显示1920x1080 @ 25fps视频太慢了

0 个答案: