C++ QBitmap::isNull方法代码示例

HCURSOR QWindowsCursor::createPixmapCursor(const QPixmap &pixmap, int hotX, int hotY)
{
    HCURSOR cur = 0;
    QBitmap mask = pixmap.mask();
    if (mask.isNull()) {
        mask = QBitmap(pixmap.size());
        mask.fill(Qt::color1);
    }

    HBITMAP ic = qt_pixmapToWinHBITMAP(pixmap, /* HBitmapAlpha */ 2);
    const HBITMAP im = qt_createIconMask(mask);

    ICONINFO ii;
    ii.fIcon     = 0;
    ii.xHotspot  = hotX;
    ii.yHotspot  = hotY;
    ii.hbmMask   = im;
    ii.hbmColor  = ic;

    cur = CreateIconIndirect(&ii);

    DeleteObject(ic);
    DeleteObject(im);
    return cur;
}

QPixmap BitmapFactoryInst::resize(int w, int h, const QPixmap& p, Qt::BGMode bgmode) const
{
    if (bgmode == Qt::TransparentMode) {
        if (p.width() == 0 || p.height() == 0)
            w = 1;

        QPixmap pix = p;
        int x = pix.width () > w ? 0 : (w - pix.width ())/2;
        int y = pix.height() > h ? 0 : (h - pix.height())/2;

        if (x == 0 && y == 0)
            return pix;

        QPixmap pm (w,h);
        QBitmap mask (w,h);
        mask.fill(Qt::color0);

        QBitmap bm = pix.mask();
        if (!bm.isNull())
        {
            QPainter painter(&mask);
            painter.drawPixmap(QPoint(x, y), bm, QRect(0, 0, pix.width(), pix.height()));
            pm.setMask(mask);
        }
        else
        {
            pm.setMask(mask);
            pm = fillRect(x, y, pix.width(), pix.height(), pm, Qt::OpaqueMode);
        }

        QPainter pt;
        pt.begin( &pm );
        pt.drawPixmap(x, y, pix);
        pt.end();
        return pm;
    } else { // Qt::OpaqueMode
        QPixmap pix = p;

        if (pix.width() == 0 || pix.height() == 0)
            return pix; // do not resize a null pixmap

        QPalette pal = qApp->palette();
        QColor dl = pal.color(QPalette::Disabled, QPalette::Light);
        QColor dt = pal.color(QPalette::Disabled, QPalette::Text);

        QPixmap pm = pix;
        pm = QPixmap(w,h);
        pm.fill(dl);

        QPainter pt;
        pt.begin( &pm );
        pt.setPen( dl );
        pt.drawPixmap(1, 1, pix);
        pt.setPen( dt );
        pt.drawPixmap(0, 0, pix);
        pt.end();
        return pm;
    }
}

QRegion::QRegion( const QBitmap & bm )
{
    data = new QRegionData;
    Q_CHECK_PTR( data );
    data->hgt = 0;
    data->is_null = FALSE;
    if ( bm.isNull() )
        data->rgn = 0;
    else
	data->rgn = qt_pm_bitmapToRegion( bm );
}

void GLWidget::createCursors()
{
	QBitmap pic = QBitmap(":/zoomIn.png");
	if(pic.isNull())
	{
		ui.print("Warning: Null pic");
	}
	QBitmap mask = QBitmap(":/zoomIn-mask.png");
	if(mask.isNull())
	{
		ui.print("Warning: Null mask");
	}
	zoomInCursor = QCursor( pic, mask);  
	QBitmap pic2 = QBitmap(":/zoomOut.png");
	if(pic2.isNull())
	{
		ui.print("Warning: Null pic2");
	}
	zoomOutCursor = QCursor( pic2, mask);  
}

void QShapedPixmapWindow::setPixmap(const QPixmap &pixmap)
{
    m_pixmap = pixmap;
    if (!m_useCompositing) {
        const QBitmap mask = m_pixmap.mask();
        if (!mask.isNull()) {
            if (!handle())
                create();
            setMask(mask);
        }
    }
}

void QPixmap::setMask( const QBitmap &newmask )
{
    const QPixmap *tmp = &newmask;		// dec cxx bug
    if ( (data == tmp->data) ||
	 ( newmask.handle() && newmask.handle() == handle() ) ) {
	QPixmap m = tmp->copy( TRUE );
	setMask( *((QBitmap*)&m) );
	data->selfmask = TRUE;			// mask == pixmap
	return;
    }

    if ( newmask.isNull() ) {			// reset the mask
	if (data->mask) {
	    detach();
	    data->selfmask = FALSE;

	    delete data->mask;
	    data->mask = 0;
	}
	return;
    }

    detach();
    data->selfmask = FALSE;

    if ( newmask.width() != width() || newmask.height() != height() ) {
#if defined(QT_CHECK_RANGE)
	qWarning( "QPixmap::setMask: The pixmap and the mask must have "
		  "the same size" );
#endif
	return;
    }
#if defined(Q_WS_MAC) || (defined(Q_WS_X11) && !defined(QT_NO_XFTFREETYPE))
    // when setting the mask, we get rid of the alpha channel completely
    delete data->alphapm;
    data->alphapm = 0;
#endif // Q_WS_X11 && !QT_NO_XFTFREETYPE

    delete data->mask;
    QBitmap* newmaskcopy;
    if ( newmask.mask() )
	newmaskcopy = (QBitmap*)new QPixmap( tmp->copy( TRUE ) );
    else
	newmaskcopy = new QBitmap( newmask );
#ifdef Q_WS_X11
    newmaskcopy->x11SetScreen( x11Screen() );
#endif
    data->mask = newmaskcopy;
}

QPixmap BitmapFactoryInst::fillRect(int x, int y, int w, int h, const QPixmap& p, Qt::BGMode bgmode) const
{
    QBitmap b = p.mask();
    if (b.isNull())
        return p; // sorry, but cannot do anything

    QPixmap pix = p;

    // modify the mask
    QPainter pt;
    pt.begin(&b);
    if (bgmode == Qt::OpaqueMode)
        pt.fillRect(x, y, w, h, Qt::color1); // make opaque
    else // Qt::TransparentMode
        pt.fillRect(x, y, w, h, Qt::color0); // make transparent
    pt.end();

    pix.setMask(b);

    return pix;
}

HICON QPixmap::toWinHICON() const
{
    QBitmap maskBitmap = mask();
    if (maskBitmap.isNull()) {
        maskBitmap= QBitmap(size());
        maskBitmap.fill(Qt::color1);
    }

    ICONINFO ii;
    ii.fIcon    = true;
    ii.hbmMask  = qt_createIconMask(maskBitmap);
    ii.hbmColor = toWinHBITMAP(QPixmap::Alpha);
    ii.xHotspot = 0;
    ii.yHotspot = 0;

    HICON hIcon = CreateIconIndirect(&ii);

    DeleteObject(ii.hbmColor);
    DeleteObject(ii.hbmMask);

    return hIcon;
}

static HCURSOR create32BitCursor(const QPixmap &pixmap, int hx, int hy)
{
    HCURSOR cur = 0;
#if !defined(Q_WS_WINCE)
    QBitmap mask = pixmap.mask();
    if (mask.isNull()) {
        mask = QBitmap(pixmap.size());
        mask.fill(Qt::color1);
    }

    HBITMAP ic = pixmap.toWinHBITMAP(QPixmap::Alpha);
    HBITMAP im = qt_createIconMask(mask);

    ICONINFO ii;
    ii.fIcon     = 0;
    ii.xHotspot  = hx;
    ii.yHotspot  = hy;
    ii.hbmMask   = im;
    ii.hbmColor  = ic;

    cur = CreateIconIndirect(&ii);

    DeleteObject(ic);
    DeleteObject(im);
#elif defined(GWES_ICONCURS)
    QImage bbits, mbits;
    bool invb, invm;
    bbits = pixmap.toImage().convertToFormat(QImage::Format_Mono);
    mbits = pixmap.toImage().convertToFormat(QImage::Format_Mono);
    invb = bbits.colorCount() > 1 && qGray(bbits.color(0)) < qGray(bbits.color(1));
    invm = mbits.colorCount() > 1 && qGray(mbits.color(0)) < qGray(mbits.color(1));

    int sysW = GetSystemMetrics(SM_CXCURSOR);
    int sysH = GetSystemMetrics(SM_CYCURSOR);
    int sysN = qMax(1, sysW / 8);
    int n = qMax(1, bbits.width() / 8);
    int h = bbits.height();

    uchar* xBits = new uchar[sysH * sysN];
    uchar* xMask = new uchar[sysH * sysN];
    int x = 0;
    for (int i = 0; i < sysH; ++i) {
        if (i >= h) {
            memset(&xBits[x] , 255, sysN);
            memset(&xMask[x] ,   0, sysN);
            x += sysN;
        } else {
            int fillWidth = n > sysN ? sysN : n;
            uchar *bits = bbits.scanLine(i);
            uchar *mask = mbits.scanLine(i);
            for (int j = 0; j < fillWidth; ++j) {
                uchar b = bits[j];
                uchar m = mask[j];
                if (invb)
                    b ^= 0xFF;
                if (invm)
                    m ^= 0xFF;
                xBits[x] = ~m;
                xMask[x] = b ^ m;
                ++x;
            }
            for (int j = fillWidth; j < sysN; ++j ) {
                xBits[x] = 255;
                xMask[x] = 0;
                ++x;
            }
        }
    }

    cur = CreateCursor(qWinAppInst(), hx, hy, sysW, sysH,
        xBits, xMask);
#else
    Q_UNUSED(pixmap);
    Q_UNUSED(hx);
    Q_UNUSED(hy);
#endif
    return cur;
}

bool kpFloodFill::fill ()
{
    if (m_initState < 2 && !prepare ())
    {
        kdError () << "kpFloodFill:fill() could not prepare()!" << endl;
        return false;
    }

    // not trying to do a NOP fill
    if (m_boundingRect.isValid ())
    {
        QApplication::setOverrideCursor (Qt::waitCursor);

        QPainter painter, maskPainter;
        QBitmap maskBitmap;

        if (m_pixmapPtr->mask () || m_color.isTransparent ())
        {
            maskBitmap = kpPixmapFX::getNonNullMask (*m_pixmapPtr);
            maskPainter.begin (&maskBitmap);
            maskPainter.setPen (m_color.maskColor ());
        }

        if (m_color.isOpaque ())
        {
            painter.begin (m_pixmapPtr);
            painter.setPen (m_color.toQColor ());
        }

        const QValueList <FillLine>::ConstIterator fillLinesEnd = m_fillLines.end ();
        for (QValueList <FillLine>::ConstIterator it = m_fillLines.begin ();
             it != fillLinesEnd;
             it++)
        {
            QPoint p1 = QPoint ((*it).m_x1, (*it).m_y);
            QPoint p2 = QPoint ((*it).m_x2, (*it).m_y);

            if (painter.isActive ())
                painter.drawLine (p1, p2);

            if (maskPainter.isActive ())
                maskPainter.drawLine (p1, p2);
        }

        if (painter.isActive ())
            painter.end ();

        if (maskPainter.isActive ())
            maskPainter.end ();

        if (!maskBitmap.isNull ())
            m_pixmapPtr->setMask (maskBitmap);

        QApplication::restoreOverrideCursor ();
    }
    else
    {
    #if DEBUG_KP_FLOOD_FILL && 1
        kdDebug () << "kpFloodFill::fill() performing NOP fill" << endl;
    #endif
    }

    return true;
}