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#include <qdebug.h>

#include <qglobal.h> // for Q_WS_WIN define (non-PCH)

#ifdef Q_WS_WIN

#include <qlibrary.h>

#include <qt_windows.h>

#endif

#include <QtGui/qpaintdevice.h>

#include <QtGui/qwidget.h>

#include "private/qwindowsurface_raster_p.h"

#include "private/qnativeimage_p.h"

#include "private/qwidget_p.h"

#ifdef Q_WS_X11

#include "private/qpixmap_x11_p.h"

#include "private/qt_x11_p.h"

#include "private/qwidget_p.h"

#include "qx11info_x11.h"

#endif

#include "private/qdrawhelper_p.h"

#ifdef Q_WS_MAC

#include <private/qt_cocoa_helpers_mac_p.h>

#endif

QT_BEGIN_NAMESPACE

class QRasterWindowSurfacePrivate

{

public:

    QNativeImage *image;

#ifdef Q_WS_X11

    GC gc;

#ifndef QT_NO_XRENDER

    uint translucentBackground : 1;

#endif

#endif

    uint inSetGeometry : 1;

};

QRasterWindowSurface::QRasterWindowSurface(QWidget *window)

    : QWindowSurface(window), d_ptr(new QRasterWindowSurfacePrivate)

{

#ifdef Q_WS_X11

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

#ifndef QT_NO_XRENDER

    d_ptr->translucentBackground = X11->use_xrender

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

#endif

#endif

    d_ptr->image = 0;

    d_ptr->inSetGeometry = false;

    setStaticContentsSupport(true);

}

QRasterWindowSurface::~QRasterWindowSurface()

{

#ifdef Q_WS_X11

    XFreeGC(X11->display, d_ptr->gc);

#endif

    if (d_ptr->image)

        delete d_ptr->image;

}

QPaintDevice *QRasterWindowSurface::paintDevice()

{

    return &d_ptr->image->image;

}

void QRasterWindowSurface::beginPaint(const QRegion &rgn)

{

#if (defined(Q_WS_X11) && !defined(QT_NO_XRENDER)) || (defined(Q_WS_WIN) && !defined(Q_WS_WINCE))

    if (!qt_widget_private(window())->isOpaque && window()->testAttribute(Qt::WA_TranslucentBackground)) {

#if defined(Q_WS_WIN) && !defined(Q_WS_WINCE)

        if (d_ptr->image->image.format() != QImage::Format_ARGB32_Premultiplied)

            prepareBuffer(QImage::Format_ARGB32_Premultiplied, window());

#endif

        QPainter p(&d_ptr->image->image);

        p.setCompositionMode(QPainter::CompositionMode_Source);

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

        const QColor blank = Qt::transparent;

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

            p.fillRect(*it, blank);

        }

    }

#else

    Q_UNUSED(rgn);

#endif

}

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

{

    Q_D(QRasterWindowSurface);

    // Not ready for painting yet, bail out. This can happen in

    // QWidget::create_sys()

    if (!d->image || rgn.rectCount() == 0)

        return;

#ifdef Q_WS_WIN

    QRect br = rgn.boundingRect();

#ifndef Q_WS_WINCE

    if (!qt_widget_private(window())->isOpaque

        && window()->testAttribute(Qt::WA_TranslucentBackground)

        && (qt_widget_private(window())->data.window_flags & Qt::FramelessWindowHint))

    {

        QRect r = window()->frameGeometry();

        QPoint frameOffset = qt_widget_private(window())->frameStrut().topLeft();

        QRect dirtyRect = br.translated(offset + frameOffset);

        SIZE size = {r.width(), r.height()};

        POINT ptDst = {r.x(), r.y()};

        POINT ptSrc = {0, 0};

        BLENDFUNCTION blend = {AC_SRC_OVER, 0, (int)(255.0 * window()->windowOpacity()), Q_AC_SRC_ALPHA};

        RECT dirty = {dirtyRect.x(), dirtyRect.y(),

            dirtyRect.x() + dirtyRect.width(), dirtyRect.y() + dirtyRect.height()};

        Q_UPDATELAYEREDWINDOWINFO info = {sizeof(info), NULL, &ptDst, &size, d->image->hdc, &ptSrc, 0, &blend, Q_ULW_ALPHA, &dirty};

        ptrUpdateLayeredWindowIndirect(window()->internalWinId(), &info);

    } else

#endif

    {

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

        HDC widget_dc = widget->getDC();

        QRect wbr = br.translated(-wOffset);

        BitBlt(widget_dc, wbr.x(), wbr.y(), wbr.width(), wbr.height(),

               d->image->hdc, br.x() + offset.x(), br.y() + offset.y(), SRCCOPY);

        widget->releaseDC(widget_dc);

    }

#ifndef QT_NO_DEBUG

    static bool flush = !qgetenv("QT_FLUSH_WINDOWSURFACE").isEmpty();

    if (flush) {

        SelectObject(qt_win_display_dc(), GetStockObject(BLACK_BRUSH));

        Rectangle(qt_win_display_dc(), 0, 0, d->image->width() + 2, d->image->height() + 2);

        BitBlt(qt_win_display_dc(), 1, 1, d->image->width(), d->image->height(),

               d->image->hdc, 0, 0, SRCCOPY);

    }

#endif

#endif

#ifdef Q_WS_X11

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

    extern QWidgetData* qt_widget_data(QWidget *);

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

    if (widget->window() != window()) {

        XFreeGC(X11->display, d_ptr->gc);

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

    }

    QRegion wrgn(rgn);

    if (!wOffset.isNull())

        wrgn.translate(-wOffset);

    QRect wbr = wrgn.boundingRect();

    if (wrgn.rectCount() != 1) {

        int num;

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

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

    }

    QRect br = rgn.boundingRect().translated(offset);

#ifndef QT_NO_MITSHM

    if (d_ptr->image->xshmpm) {

        XCopyArea(X11->display, d_ptr->image->xshmpm, widget->handle(), d_ptr->gc,

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

        XSync(X11->display, False);

    } else if (d_ptr->image->xshmimg) {

        const QImage &src = d->image->image;

        br = br.intersected(src.rect());

        XShmPutImage(X11->display, widget->handle(), d_ptr->gc, d_ptr->image->xshmimg,

                     br.x(), br.y(), wbr.x(), wbr.y(), br.width(), br.height(), False);

        XSync(X11->display, False);

    } else

#endif

    {

        const QImage &src = d->image->image;

        br = br.intersected(src.rect());

        if (src.format() != QImage::Format_RGB32 || widget->x11Info().depth() < 24) {

            Q_ASSERT(src.depth() >= 16);

            const QImage sub_src(src.scanLine(br.y()) + br.x() * (uint(src.depth()) / 8),

                                 br.width(), br.height(), src.bytesPerLine(), src.format());

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

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

            data->fromImage(sub_src, Qt::NoOpaqueDetection);

            QPixmap pm = QPixmap(data);

            XCopyArea(X11->display, pm.handle(), widget->handle(), d_ptr->gc, 0 , 0 , br.width(), br.height(), wbr.x(), wbr.y());

        } else {

            // qpaintengine_x11.cpp

            extern void qt_x11_drawImage(const QRect &rect, const QPoint &pos, const QImage &image, Drawable hd, GC gc, Display *dpy, Visual *visual, int depth);

            qt_x11_drawImage(br, wbr.topLeft(), src, widget->handle(), d_ptr->gc, X11->display, (Visual *)widget->x11Info().visual(), widget->x11Info().depth());

        }

    }

    if (wrgn.rectCount() != 1)

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

#endif // FALCON

#ifdef Q_WS_MAC

//     qDebug() << "Flushing" << widget << rgn << offset;

//     d->image->image.save("flush.png");

    Q_UNUSED(offset);

    // Get a context for the widget.

#ifndef QT_MAC_USE_COCOA

    CGContextRef context;

    CGrafPtr port = GetWindowPort(qt_mac_window_for(widget));

    QDBeginCGContext(port, &context);

#else

    extern CGContextRef qt_mac_graphicsContextFor(QWidget *);

    CGContextRef context = qt_mac_graphicsContextFor(widget);

#endif

    CGContextSaveGState(context);

    // Flip context.

    CGContextTranslateCTM(context, 0, widget->height());

    CGContextScaleCTM(context, 1, -1);

    // Clip to region.

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

    for (int i = 0; i < rects.size(); ++i) {

        const QRect &rect = rects.at(i);

        CGContextAddRect(context, CGRectMake(rect.x(), rect.y(), rect.width(), rect.height()));

    }

    CGContextClip(context);

    QRect r = rgn.boundingRect();

    const CGRect area = CGRectMake(r.x(), r.y(), r.width(), r.height());

    CGImageRef image = CGBitmapContextCreateImage(d->image->cg);

    CGImageRef subImage = CGImageCreateWithImageInRect(image, area);

    qt_mac_drawCGImage(context, &area, subImage);

    CGImageRelease(subImage);

    CGImageRelease(image);

//     CGSize size = { d->image->image.width(), d->image->image.height() };

//     CGLayerRef layer = CGLayerCreateWithContext(d->image->cg, size, 0);

//     CGPoint pt = { 0, 0 };

//     CGContextDrawLayerAtPoint(context, pt, layer);

//     CGLayerRelease(layer);

    // Restore context.

    CGContextRestoreGState(context);

#ifndef QT_MAC_USE_COCOA

    QDEndCGContext(port, &context);

#else

    CGContextFlush(context);

#endif

#endif

#ifdef Q_OS_SYMBIAN

    Q_UNUSED(widget);

    Q_UNUSED(rgn);

    Q_UNUSED(offset);

#endif

}

void QRasterWindowSurface::setGeometry(const QRect &rect)

{

    QWindowSurface::setGeometry(rect);

    Q_D(QRasterWindowSurface);

    d->inSetGeometry = true;

    if (d->image == 0 || d->image->width() < rect.width() || d->image->height() < rect.height()) {

#if (defined(Q_WS_X11) && !defined(QT_NO_XRENDER)) || (defined(Q_WS_WIN) && !defined(Q_WS_WINCE))

#ifndef Q_WS_WIN

        if (d_ptr->translucentBackground)

#else

        if (!qt_widget_private(window())->isOpaque)

#endif

            prepareBuffer(QImage::Format_ARGB32_Premultiplied, window());

        else

#endif

            prepareBuffer(QNativeImage::systemFormat(), window());

    }

    d->inSetGeometry = false;

}

// from qwindowsurface.cpp

extern void qt_scrollRectInImage(QImage &img, const QRect &rect, const QPoint &offset);

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

{

#ifdef Q_WS_WIN

    Q_D(QRasterWindowSurface);

    if (!d->image || !d->image->hdc)

        return false;

    QRect rect = area.boundingRect();

    BitBlt(d->image->hdc, rect.x()+dx, rect.y()+dy, rect.width(), rect.height(),

           d->image->hdc, rect.x(), rect.y(), SRCCOPY);

    return true;

#else

    Q_D(QRasterWindowSurface);

    if (!d->image || d->image->image.isNull())

        return false;

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

    for (int i = 0; i < rects.size(); ++i)

        qt_scrollRectInImage(d->image->image, rects.at(i), QPoint(dx, dy));

    return true;

#endif

}

void QRasterWindowSurface::prepareBuffer(QImage::Format format, QWidget *widget)

{

    Q_D(QRasterWindowSurface);

    int width = window()->width();

    int height = window()->height();

    if (d->image) {

        width = qMax(d->image->width(), width);

        height = qMax(d->image->height(), height);

    }

    if (width == 0 || height == 0) {

        delete d->image;

        d->image = 0;

        return;

    }

    QNativeImage *oldImage = d->image;

    d->image = new QNativeImage(width, height, format, false, widget);

    if (oldImage && d->inSetGeometry && hasStaticContents()) {

        // Make sure we use the const version of bits() (no detach).

        const uchar *src = const_cast<const QImage &>(oldImage->image).bits();

        uchar *dst = d->image->image.bits();

        const int srcBytesPerLine = oldImage->image.bytesPerLine();

        const int dstBytesPerLine = d->image->image.bytesPerLine();

        const int bytesPerPixel = oldImage->image.depth() >> 3;

        QRegion staticRegion(staticContents());

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

        staticRegion &= QRect(0, 0, oldImage->image.width(), oldImage->image.height());

        const QVector<QRect> &rects = staticRegion.rects();

        const QRect *srcRect = rects.constData();

        // Copy the static content of the old image into the new one.

        int numRectsLeft = rects.size();

        do {

            const int bytesOffset = srcRect->x() * bytesPerPixel;

            const int dy = srcRect->y();

            // Adjust src and dst to point to the right offset.

            const uchar *s = src + dy * srcBytesPerLine + bytesOffset;

            uchar *d = dst + dy * dstBytesPerLine + bytesOffset;

            const int numBytes = srcRect->width() * bytesPerPixel;

            int numScanLinesLeft = srcRect->height();

            do {

                ::memcpy(d, s, numBytes);

                d += dstBytesPerLine;

                s += srcBytesPerLine;

            } while (--numScanLinesLeft);

            ++srcRect;

        } while (--numRectsLeft);

    }

    delete oldImage;

}

QT_END_NAMESPACE