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#include <QtGui/QPaintDevice>

#include <QtGui/QPainter>

#include <QtGui/QPixmap>

#include <QtGui/QWidget>

#include "private/qt_x11_p.h"

#include "private/qpixmap_x11_p.h"

#include "private/qwidget_p.h"

#include "qx11info_x11.h"

#include "qwindowsurface_x11_p.h"

QT_BEGIN_NAMESPACE

extern void *qt_getClipRects(const QRegion &r, int &num); // in qpaintengine_x11.cpp

struct QX11WindowSurfacePrivate

{

    QWidget *widget;

    QPixmap device;

#ifndef QT_NO_XRENDER

    bool translucentBackground;

#endif

};

QX11WindowSurface::QX11WindowSurface(QWidget *widget)

    : QWindowSurface(widget), d_ptr(new QX11WindowSurfacePrivate), gc(0)

{

    d_ptr->widget = widget;

#ifndef QT_NO_XRENDER

    d_ptr->translucentBackground = X11->use_xrender

        && widget->x11Info().depth() == 32;

    setStaticContentsSupport(!d_ptr->translucentBackground);

#else

    setStaticContentsSupport(true);

#endif

}

QX11WindowSurface::~QX11WindowSurface()

{

    delete d_ptr;

    if (gc) {

        XFreeGC(X11->display, gc);

        gc = 0;

    }

}

QPaintDevice *QX11WindowSurface::paintDevice()

{

    return &d_ptr->device;

}

void QX11WindowSurface::beginPaint(const QRegion &rgn)

{

#ifndef QT_NO_XRENDER

    Q_ASSERT(!d_ptr->device.isNull());

    if (d_ptr->translucentBackground) {

        if (d_ptr->device.depth() != 32)

            static_cast<QX11PixmapData *>(d_ptr->device.data_ptr().data())->convertToARGB32();

        ::Picture src = X11->getSolidFill(d_ptr->device.x11Info().screen(), Qt::transparent);

        ::Picture dst = d_ptr->device.x11PictureHandle();

        const QVector<QRect> rects = rgn.rects();

        const int w = d_ptr->device.width();

        const int h = d_ptr->device.height();

        for (QVector<QRect>::const_iterator it = rects.begin(); it != rects.end(); ++it)

            XRenderComposite(X11->display, PictOpSrc, src, 0, dst,

                             0, 0, w, h, it->x(), it->y(),

                             it->width(), it->height());

    }

#endif

}

void QX11WindowSurface::flush(QWidget *widget, const QRegion &rgn, const QPoint &offset)

{

    if (d_ptr->device.isNull())

        return;

    QPoint wOffset = qt_qwidget_data(widget)->wrect.topLeft();

    QRegion wrgn(rgn);

    QRect br = rgn.boundingRect();

    if (!wOffset.isNull())

        wrgn.translate(-wOffset);

    QRect wbr = wrgn.boundingRect();

    int num;

    XRectangle *rects = (XRectangle *)qt_getClipRects(wrgn, num);

    if (num <= 0)

        return;

//         qDebug() << "XSetClipRectangles";

//         for  (int i = 0; i < num; ++i)

//             qDebug() << ' ' << i << rects[i].x << rects[i].x << rects[i].y << rects[i].width << rects[i].height;

    if (num != 1)

        XSetClipRectangles(X11->display, gc, 0, 0, rects, num, YXBanded);

    XCopyArea(X11->display, d_ptr->device.handle(), widget->handle(), gc,

              br.x() + offset.x(), br.y() + offset.y(), br.width(), br.height(), wbr.x(), wbr.y());

    if (num != 1)

        XSetClipMask(X11->display, gc, XNone);

}

void QX11WindowSurface::setGeometry(const QRect &rect)

{

    QWindowSurface::setGeometry(rect);

    const QSize size = rect.size();

    if (d_ptr->device.size() == size || size.width() <= 0 || size.height() <= 0)

        return;

#ifndef QT_NO_XRENDER

    if (d_ptr->translucentBackground) {

        QX11PixmapData *data = new QX11PixmapData(QPixmapData::PixmapType);

        data->xinfo = d_ptr->widget->x11Info();

        data->resize(size.width(), size.height());

        d_ptr->device = QPixmap(data);

    } else

#endif

    {

        QPixmap::x11SetDefaultScreen(d_ptr->widget->x11Info().screen());

        QX11PixmapData *oldData = static_cast<QX11PixmapData *>(d_ptr->device.pixmapData());

        if (oldData && !(oldData->flags & QX11PixmapData::Uninitialized) && hasStaticContents()) {

            // Copy the content of the old pixmap into the new one.

            QX11PixmapData *newData = new QX11PixmapData(QPixmapData::PixmapType);

            newData->resize(size.width(), size.height());

            Q_ASSERT(oldData->d == newData->d);

            QRegion staticRegion(staticContents());

            // Make sure we're inside the boundaries of the old pixmap.

            staticRegion &= QRect(0, 0, oldData->w, oldData->h);

            const QRect boundingRect(staticRegion.boundingRect());

            const int dx = boundingRect.x();

            const int dy = boundingRect.y();

            int num;

            XRectangle *rects = (XRectangle *)qt_getClipRects(staticRegion, num);

            GC tmpGc = XCreateGC(X11->display, oldData->hd, 0, 0);

            XSetClipRectangles(X11->display, tmpGc, 0, 0, rects, num, YXBanded);

            XCopyArea(X11->display, oldData->hd, newData->hd, tmpGc,

                      dx, dy, qMin(boundingRect.width(), size.width()),

                      qMin(boundingRect.height(), size.height()), dx, dy);

            XFreeGC(X11->display, tmpGc);

            newData->flags &= ~QX11PixmapData::Uninitialized;

            d_ptr->device = QPixmap(newData);

        } else {

            d_ptr->device = QPixmap(size);

        }

    }

    if (gc) {

        XFreeGC(X11->display, gc);

        gc = 0;

    }

    if (!d_ptr->device.isNull()) {

        gc = XCreateGC(X11->display, d_ptr->device.handle(), 0, 0);

        XSetGraphicsExposures(X11->display, gc, False);

    }

}

bool QX11WindowSurface::scroll(const QRegion &area, int dx, int dy)

{

    QRect rect = area.boundingRect();

    if (d_ptr->device.isNull())

        return false;

    GC gc = XCreateGC(X11->display, d_ptr->device.handle(), 0, 0);

    XCopyArea(X11->display, d_ptr->device.handle(), d_ptr->device.handle(), gc,

              rect.x(), rect.y(), rect.width(), rect.height(),

              rect.x()+dx, rect.y()+dy);

    XFreeGC(X11->display, gc);

    return true;

}

QPixmap QX11WindowSurface::grabWidget(const QWidget *widget,

                                      const QRect& rect) const

{

    if (!widget || d_ptr->device.isNull())

        return QPixmap();

    QRect srcRect;

    // make sure the rect is inside the widget & clip to widget's rect

    if (!rect.isEmpty())

        srcRect = rect & widget->rect();

    else

        srcRect = widget->rect();

    if (srcRect.isEmpty())

        return QPixmap();

    // If it's a child widget we have to translate the coordinates

    if (widget != window())

        srcRect.translate(widget->mapTo(window(), QPoint(0, 0)));

    QPixmap::x11SetDefaultScreen(widget->x11Info().screen());

    QPixmap px(srcRect.width(), srcRect.height());

    GC tmpGc = XCreateGC(X11->display, d_ptr->device.handle(), 0, 0);

    // Copy srcRect from the backing store to the new pixmap

    XSetGraphicsExposures(X11->display, tmpGc, False);

    XCopyArea(X11->display, d_ptr->device.handle(), px.handle(), tmpGc,

              srcRect.x(), srcRect.y(), srcRect.width(), srcRect.height(), 0, 0);

    XFreeGC(X11->display, tmpGc);

    return px;

}

QT_END_NAMESPACE