qwindowsurface.cpp

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#include <private/qwindowsurface_p.h>
#include <qwidget.h>
#include <private/qwidget_p.h>
#include <private/qbackingstore_p.h>
#include <private/qapplication_p.h>

QT_BEGIN_NAMESPACE

class QWindowSurfacePrivate
{
public:
    QWindowSurfacePrivate(QWidget *w)
        : window(w)
    {
    }

    QWidget *window;
#if !defined(Q_WS_QPA)
    QRect geometry;
#else
    QSize size;
#endif //Q_WS_QPA
    QRegion staticContents;
    QList<QImage*> bufferImages;
};

QWindowSurface::QWindowSurface(QWidget *window, bool setDefaultSurface)
    : d_ptr(new QWindowSurfacePrivate(window))
{
    if (!QApplicationPrivate::runtime_graphics_system) {
        if(setDefaultSurface && window)
            window->setWindowSurface(this);
    }
}

QWindowSurface::~QWindowSurface()
{
    if (d_ptr->window)
        d_ptr->window->d_func()->extra->topextra->windowSurface = 0;
    delete d_ptr;
}

QWidget* QWindowSurface::window() const
{
    return d_ptr->window;
}

void QWindowSurface::beginPaint(const QRegion &)
{
}

void QWindowSurface::endPaint(const QRegion &)
{
//     QApplication::syncX();
    qDeleteAll(d_ptr->bufferImages);
    d_ptr->bufferImages.clear();
}

#if !defined(Q_WS_QPA)

void QWindowSurface::setGeometry(const QRect &rect)
{
    d_ptr->geometry = rect;
}

QRect QWindowSurface::geometry() const
{
    return d_ptr->geometry;
}
#else

void QWindowSurface::resize(const QSize &size)
{
    d_ptr->size = size;
}

QSize QWindowSurface::size() const
{
    return d_ptr->size;
}
#endif //Q_WS_QPA

bool QWindowSurface::scroll(const QRegion &area, int dx, int dy)
{
    Q_UNUSED(area);
    Q_UNUSED(dx);
    Q_UNUSED(dy);

    return false;
}

QImage* QWindowSurface::buffer(const QWidget *widget)
{
    if (widget->window() != window())
        return 0;

    QPaintDevice *pdev = paintDevice();
    if (!pdev || pdev->devType() != QInternal::Image)
        return 0;

    const QPoint off = offset(widget);
    QImage *img = static_cast<QImage*>(pdev);

    QRect rect(off, widget->size());
    rect &= QRect(QPoint(), img->size());

    if (rect.isEmpty())
        return 0;

    img = new QImage(img->scanLine(rect.y()) + rect.x() * img->depth() / 8,
                     rect.width(), rect.height(),
                     img->bytesPerLine(), img->format());
    d_ptr->bufferImages.append(img);

    return img;
}

QPixmap QWindowSurface::grabWidget(const QWidget *widget, const QRect &rectangle) const
{
    QPixmap result;

    if (widget->window() != window())
        return result;

    const QImage *img = const_cast<QWindowSurface *>(this)->buffer(widget->window());

    if (!img || img->isNull())
        return result;

    QRect rect = rectangle.isEmpty() ? widget->rect() : (widget->rect() & rectangle);

    rect.translate(offset(widget) - offset(widget->window()));
    rect &= QRect(QPoint(), img->size());

    if (rect.isEmpty())
        return result;

    QImage subimg(img->scanLine(rect.y()) + rect.x() * img->depth() / 8,
                  rect.width(), rect.height(),
                  img->bytesPerLine(), img->format());
    subimg.detach(); //### expensive -- maybe we should have a real SubImage that shares reference count

    result = QPixmap::fromImage(subimg);
    return result;
}

QPoint QWindowSurface::offset(const QWidget *widget) const
{
    QWidget *window = d_ptr->window;
    QPoint offset = widget->mapTo(window, QPoint());
#ifdef Q_WS_QWS
    offset += window->geometry().topLeft() - window->frameGeometry().topLeft();
#endif
    return offset;
}

void QWindowSurface::setStaticContents(const QRegion &region)
{
    d_ptr->staticContents = region;
}

QRegion QWindowSurface::staticContents() const
{
    return d_ptr->staticContents;
}

bool QWindowSurface::hasStaticContents() const
{
    return hasFeature(QWindowSurface::StaticContents) && !d_ptr->staticContents.isEmpty();
}

QWindowSurface::WindowSurfaceFeatures QWindowSurface::features() const
{
    return PartialUpdates | PreservedContents;
}

#ifdef Q_WS_QPA
#define Q_EXPORT_SCROLLRECT Q_GUI_EXPORT
#else
#define Q_EXPORT_SCROLLRECT
#endif

void Q_EXPORT_SCROLLRECT qt_scrollRectInImage(QImage &img, const QRect &rect, const QPoint &offset)
{
    // make sure we don't detach
    uchar *mem = const_cast<uchar*>(const_cast<const QImage &>(img).bits());

    int lineskip = img.bytesPerLine();
    int depth = img.depth() >> 3;

    const QRect imageRect(0, 0, img.width(), img.height());
    const QRect r = rect & imageRect & imageRect.translated(-offset);
    const QPoint p = rect.topLeft() + offset;

    if (r.isEmpty())
        return;

    const uchar *src;
    uchar *dest;

    if (r.top() < p.y()) {
        src = mem + r.bottom() * lineskip + r.left() * depth;
        dest = mem + (p.y() + r.height() - 1) * lineskip + p.x() * depth;
        lineskip = -lineskip;
    } else {
        src = mem + r.top() * lineskip + r.left() * depth;
        dest = mem + p.y() * lineskip + p.x() * depth;
    }

    const int w = r.width();
    int h = r.height();
    const int bytes = w * depth;

    // overlapping segments?
    if (offset.y() == 0 && qAbs(offset.x()) < w) {
        do {
            ::memmove(dest, src, bytes);
            dest += lineskip;
            src += lineskip;
        } while (--h);
    } else {
        do {
            ::memcpy(dest, src, bytes);
            dest += lineskip;
            src += lineskip;
        } while (--h);
    }
}

QT_END_NAMESPACE