qwindowsurface_qws.cpp

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#include "qwindowsurface_qws_p.h"
#include <qwidget.h>
#include <qscreen_qws.h>
#include <qwsmanager_qws.h>
#include <qapplication.h>
#include <qwsdisplay_qws.h>
#include <qrgb.h>
#include <qpaintengine.h>
#include <qdesktopwidget.h>
#include <private/qapplication_p.h>
#include <private/qwsdisplay_qws_p.h>
#include <private/qwidget_p.h>
#include <private/qwsmanager_p.h>
#include <private/qwslock_p.h>
#include <private/qbackingstore_p.h>
#include <stdio.h>

QT_BEGIN_NAMESPACE

#ifdef Q_BACKINGSTORE_SUBSURFACES

typedef QMap<int, QWSWindowSurface*> SurfaceMap;
Q_GLOBAL_STATIC(SurfaceMap, winIdToSurfaceMap);

QWSWindowSurface* qt_findWindowSurface(int winId)
{
    return winIdToSurfaceMap()->value(winId);
}

static void qt_insertWindowSurface(int winId, QWSWindowSurface *surface)
{
    if (!surface)
        winIdToSurfaceMap()->remove(winId);
    else
        winIdToSurfaceMap()->insert(winId, surface);
}

#endif // Q_BACKINGSTORE_SUBSURFACES

inline bool isWidgetOpaque(const QWidget *w)
{
    return w->d_func()->isOpaque && !w->testAttribute(Qt::WA_TranslucentBackground);
}

static inline QScreen *getScreen(const QWidget *w)
{
    const QList<QScreen*> subScreens = qt_screen->subScreens();
    if (subScreens.isEmpty())
        return qt_screen;

    const int screen = QApplication::desktop()->screenNumber(w);

    return qt_screen->subScreens().at(screen < 0 ? 0 : screen);
}

static int bytesPerPixel(QImage::Format format)
{
    switch (format) {
    case QImage::Format_Invalid:
        return 0;
#ifndef QT_NO_DEBUG
    case QImage::Format_Mono:
    case QImage::Format_MonoLSB:
        qFatal("QWSWindowSurface: Invalid backingstore format: %i",
               int(format));
#endif
    case QImage::Format_Indexed8:
        return 1;
    case QImage::Format_RGB32:
    case QImage::Format_ARGB32:
    case QImage::Format_ARGB32_Premultiplied:
        return 4;
    case QImage::Format_RGB16:
    case QImage::Format_RGB555:
    case QImage::Format_RGB444:
    case QImage::Format_ARGB4444_Premultiplied:
        return 2;
    case QImage::Format_ARGB8565_Premultiplied:
    case QImage::Format_ARGB8555_Premultiplied:
    case QImage::Format_ARGB6666_Premultiplied:
    case QImage::Format_RGB666:
    case QImage::Format_RGB888:
        return 3;
    default:
#ifndef QT_NO_DEBUG
        qFatal("QWSWindowSurface: Invalid backingstore format: %i",
               int(format));
#endif
        return 0;
    }
}

static inline int nextMulOf4(int n)
{
    return ((n + 3) & 0xfffffffc);
}

static inline void setImageMetrics(QImage &img, QWidget *window) {
    QScreen *myScreen = getScreen(window);
    if (myScreen) {
        int dpmx = myScreen->width()*1000 / myScreen->physicalWidth();
        int dpmy = myScreen->height()*1000 / myScreen->physicalHeight();
        img.setDotsPerMeterX(dpmx);
        img.setDotsPerMeterY(dpmy);
    }
}

void QWSWindowSurface::invalidateBuffer()
{

    QWidget *win = window();
    if (win) {
        win->d_func()->invalidateBuffer(win->rect());
#ifndef QT_NO_QWS_MANAGER
        QTLWExtra *topextra = win->d_func()->extra->topextra;
        QWSManager *manager = topextra->qwsManager;
        if (manager)
            manager->d_func()->dirtyRegion(QDecoration::All,
                                           QDecoration::Normal);
#endif
    }
}

QWSWindowSurfacePrivate::QWSWindowSurfacePrivate()
    : flags(0),
#ifdef QT_QWS_CLIENTBLIT
    directId(-1),
#endif
    winId(0)
{
}

void QWSWindowSurfacePrivate::setWinId(int id)
{
    winId = id;
}

int QWSWindowSurface::winId() const
{
    // XXX: the widget winId may change during the lifetime of the widget!!!

    const QWidget *win = window();
    if (win && win->isWindow())
        return win->internalWinId();

#ifdef Q_BACKINGSTORE_SUBSURFACES
    if (!d_ptr->winId) {
        QWSWindowSurface *that = const_cast<QWSWindowSurface*>(this);
        QWSDisplay *display = QWSDisplay::instance();
        const int id = display->takeId();
        qt_insertWindowSurface(id, that);
        that->d_ptr->winId = id;

        if (win)
            display->nameRegion(id, win->objectName(), win->windowTitle());
        else
            display->nameRegion(id, QString(), QString());

        display->setAltitude(id, 1, true); // XXX
    }
#endif

    return d_ptr->winId;
}

void QWSWindowSurface::setWinId(int id)
{
    d_ptr->winId = id;
}

QWSWindowSurface::QWSWindowSurface()
    : QWindowSurface(0), d_ptr(new QWSWindowSurfacePrivate)
{
}

QWSWindowSurface::QWSWindowSurface(QWidget *widget)
    : QWindowSurface(widget), d_ptr(new QWSWindowSurfacePrivate)
{
}

QWSWindowSurface::~QWSWindowSurface()
{
#ifdef Q_BACKINGSTORE_SUBSURFACES
    if (d_ptr->winId)
        winIdToSurfaceMap()->remove(d_ptr->winId);
#endif

    delete d_ptr;
}

QPoint QWSWindowSurface::painterOffset() const
{
    const QWidget *w = window();
    if (!w)
        return QPoint();
    return w->geometry().topLeft() - w->frameGeometry().topLeft();
}

void QWSWindowSurface::beginPaint(const QRegion &)
{
    lock();
}

void QWSWindowSurface::endPaint(const QRegion &)
{
    unlock();
}

// XXX: documentation!!!
QByteArray QWSWindowSurface::transientState() const
{
    return QByteArray();
}

QByteArray QWSWindowSurface::permanentState() const
{
    return QByteArray();
}

void QWSWindowSurface::setTransientState(const QByteArray &state)
{
    Q_UNUSED(state);
}

void QWSWindowSurface::setPermanentState(const QByteArray &state)
{
    Q_UNUSED(state);
}

bool QWSWindowSurface::lock(int timeout)
{
    Q_UNUSED(timeout);
    return true;
}

void QWSWindowSurface::unlock()
{
}

#ifdef QT_QWS_CLIENTBLIT

const QRegion QWSWindowSurface::directRegion() const
{
    return d_ptr->direct;
}

int QWSWindowSurface::directRegionId() const
{
    return d_ptr->directId;
}

void QWSWindowSurface::setDirectRegion(const QRegion &r, int id)
{
    d_ptr->direct = r;
    d_ptr->directId = id;
}
#endif

const QRegion QWSWindowSurface::clipRegion() const
{
    return d_ptr->clip;
}

void QWSWindowSurface::setClipRegion(const QRegion &clip)
{
    if (clip == d_ptr->clip)
        return;

    QRegion expose = (clip - d_ptr->clip);
    d_ptr->clip = clip;

    if (expose.isEmpty() || clip.isEmpty())
        return; // No repaint or flush required.

    QWidget *win = window();
    if (!win)
        return;

    if (isBuffered()) {
        // No repaint required. Flush exposed area via the backing store.
        win->d_func()->syncBackingStore(expose);
        return;
    }

#ifndef QT_NO_QWS_MANAGER
    // Invalidate exposed decoration area.
    if (win && win->isWindow()) {
        QTLWExtra *topextra = win->d_func()->extra->topextra;
        if (QWSManager *manager = topextra->qwsManager) {
            QRegion decorationExpose(manager->region());
            decorationExpose.translate(-win->geometry().topLeft());
            decorationExpose &= expose;
            if (!decorationExpose.isEmpty()) {
                expose -= decorationExpose;
                manager->d_func()->dirtyRegion(QDecoration::All, QDecoration::Normal, decorationExpose);
            }
        }
    }
#endif

    // Invalidate exposed widget area.
    win->d_func()->invalidateBuffer(expose);
}

QWSWindowSurface::SurfaceFlags QWSWindowSurface::surfaceFlags() const
{
    return d_ptr->flags;
}

void QWSWindowSurface::setSurfaceFlags(SurfaceFlags flags)
{
    d_ptr->flags = flags;
}

void QWSWindowSurface::setGeometry(const QRect &rect)
{
    QRegion mask = rect;

    const QWidget *win = window();
    if (win) {
#ifndef QT_NO_QWS_MANAGER
        if (win->isWindow()) {
            QTLWExtra *topextra = win->d_func()->extra->topextra;
            QWSManager *manager = topextra->qwsManager;

            if (manager) {
                // The frame geometry is the bounding rect of manager->region,
                // which could be too much, so we need to clip.
                mask &= (manager->region() + win->geometry());
            }
        }
#endif

        const QRegion winMask = win->mask();
        if (!winMask.isEmpty())
            mask &= winMask.translated(win->geometry().topLeft());
    }

    setGeometry(rect, mask);
}

void QWSWindowSurface::setGeometry(const QRect &rect, const QRegion &mask)
{
    if (rect == geometry()) // XXX: && mask == prevMask
        return;

    const bool isResize = rect.size() != geometry().size();
    const bool needsRepaint = isResize || !isBuffered();

    QWindowSurface::setGeometry(rect);

    const QRegion region = mask & rect;
    QWidget *win = window();
    // Only request regions for widgets visible on the screen.
    // (Added the !win check for compatibility reasons, because
    // there was no "if (win)" check before).
    const bool requestQWSRegion = !win || !win->testAttribute(Qt::WA_DontShowOnScreen);
    if (requestQWSRegion)
        QWidget::qwsDisplay()->requestRegion(winId(), key(), permanentState(), region);

    if (needsRepaint)
        invalidateBuffer();

    if (!requestQWSRegion) {
        // We didn't request a region, hence we won't get a QWSRegionEvent::Allocation
        // event back from the server so we set the clip directly. We have to
        // do this after the invalidateBuffer() call above, as it might trigger a
        // backing store sync, resulting in too many update requests.
        setClipRegion(region);
    }
}

static inline void flushUpdate(QWidget *widget, const QRegion &region,
                               const QPoint &offset)
{
#ifdef QT_NO_PAINT_DEBUG
    Q_UNUSED(widget);
    Q_UNUSED(region);
    Q_UNUSED(offset);
#else
    static int delay = -1;

    if (delay == -1)
        delay = qgetenv("QT_FLUSH_UPDATE").toInt() * 10;

    if (delay == 0)
        return;

    static QWSYellowSurface surface(true);
    surface.setDelay(delay);
    surface.flush(widget, region, offset);
#endif // QT_NO_PAINT_DEBUG
}

void QWSWindowSurface::flush(QWidget *widget, const QRegion &region,
                             const QPoint &offset)
{
    const QWidget *win = window();
    if (!win)
        return;

#ifndef QT_NO_GRAPHICSVIEW
    QWExtra *extra = win->d_func()->extra;
    if (extra && extra->proxyWidget)
        return;
#endif //QT_NO_GRAPHICSVIEW

    Q_UNUSED(offset);

    const bool opaque = isOpaque();
#ifdef QT_QWS_DISABLE_FLUSHCLIPPING
    QRegion toFlush = region;
#else
    QRegion toFlush = region & d_ptr->clip;
#endif

    if (!toFlush.isEmpty()) {
        flushUpdate(widget, toFlush, QPoint(0, 0));
        QPoint globalZero = win->mapToGlobal(QPoint(0, 0));
        toFlush.translate(globalZero);

#ifdef QT_QWS_CLIENTBLIT
        bool needRepaint = true;
        if (opaque) {
            QScreen* widgetScreen = getScreen(widget);
            if (widgetScreen->supportsBlitInClients()) {

                QWSDisplay::grab();
                if(directRegion().intersected(toFlush) == toFlush) {
                    QPoint translate = -globalZero + painterOffset() + geometry().topLeft();
                    QRegion flushRegion = toFlush.translated(translate);
                    widgetScreen->blit(image(), geometry().topLeft(), flushRegion);
                    widgetScreen->setDirty(toFlush.boundingRect());
                    needRepaint = false;
                }
                QWSDisplay::ungrab();
            }
        }

        if(needRepaint)
#endif
            win->qwsDisplay()->repaintRegion(winId(), win->windowFlags(), opaque, toFlush);
    }
}

bool QWSWindowSurface::move(const QPoint &offset)
{
    QWindowSurface::setGeometry(geometry().translated(offset));
    return isBuffered();
}

QRegion QWSWindowSurface::move(const QPoint &offset, const QRegion &newClip)
{
    const QRegion oldGeometry = geometry();
    QWindowSurface::setGeometry(geometry().translated(offset));
    return oldGeometry + newClip;
}

void QWSWindowSurface::releaseSurface()
{
}

bool QWSMemorySurface::lock(int timeout)
{
    Q_UNUSED(timeout);
#ifndef QT_NO_QWS_MULTIPROCESS
    if (memlock && !memlock->lock(QWSLock::BackingStore))
        return false;
#endif
#ifndef QT_NO_THREAD
    threadLock.lock();
#endif
    return true;
}

void QWSMemorySurface::unlock()
{
#ifndef QT_NO_THREAD
    threadLock.unlock();
#endif
#ifndef QT_NO_QWS_MULTIPROCESS
    if (memlock)
        memlock->unlock(QWSLock::BackingStore);
#endif
}

QWSMemorySurface::QWSMemorySurface()
    : QWSWindowSurface()
#ifndef QT_NO_QWS_MULTIPROCESS
    , memlock(0)
#endif
{
    setSurfaceFlags(Buffered);
}

QWSMemorySurface::QWSMemorySurface(QWidget *w)
    : QWSWindowSurface(w)
{
    SurfaceFlags flags = Buffered;
    if (isWidgetOpaque(w))
        flags |= Opaque;
    setSurfaceFlags(flags);

#ifndef QT_NO_QWS_MULTIPROCESS
    memlock = QWSDisplay::Data::getClientLock();
#endif
}

QWSMemorySurface::~QWSMemorySurface()
{
#ifndef QT_NO_QWS_MULTIPROCESS
    if (memlock != QWSDisplay::Data::getClientLock())
        delete memlock;
#endif
}


QImage::Format
QWSMemorySurface::preferredImageFormat(const QWidget *widget) const
{
    QScreen *screen = getScreen(widget);
    const int depth = screen->depth();
    const bool opaque = isWidgetOpaque(widget);

    if (!opaque) {
        if (depth <= 12)
            return QImage::Format_ARGB4444_Premultiplied;
        else if (depth <= 15)
            return QImage::Format_ARGB8555_Premultiplied;
        else if (depth <= 16)
            return QImage::Format_ARGB8565_Premultiplied;
        else if (depth <= 18)
            return QImage::Format_ARGB6666_Premultiplied;
        else
            return QImage::Format_ARGB32_Premultiplied;
    }

    QImage::Format format = screen->pixelFormat();
    if (format > QImage::Format_Indexed8) // ### assumes all new image formats supports a QPainter
        return format;

    if (depth <= 12)
        return QImage::Format_RGB444;
    else if (depth <= 15)
        return QImage::Format_RGB555;
    else if (depth <= 16)
        return QImage::Format_RGB16;
    else if (depth <= 18)
        return QImage::Format_RGB666;
    else if (depth <= 24)
        return QImage::Format_RGB888;
    else
        return QImage::Format_ARGB32_Premultiplied;
}

#ifndef QT_NO_QWS_MULTIPROCESS
void QWSMemorySurface::setLock(int lockId)
{
    if (memlock && memlock->id() == lockId)
        return;
    if (memlock != QWSDisplay::Data::getClientLock())
        delete memlock;
    memlock = (lockId == -1 ? 0 : new QWSLock(lockId));
}
#endif // QT_NO_QWS_MULTIPROCESS

bool QWSMemorySurface::isValid() const
{
    if (img.isNull())
        return true;

    const QWidget *win = window();
    if (preferredImageFormat(win) != img.format())
        return false;

    if (isOpaque() != isWidgetOpaque(win)) // XXX: use QWidgetPrivate::isOpaque()
        return false;

    return true;
}

// ### copied from qwindowsurface_raster.cpp -- should be cross-platform
void QWSMemorySurface::beginPaint(const QRegion &rgn)
{
    if (!isWidgetOpaque(window())) {
        QPainter p(&img);
        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) {
            QRect r = *it;
#ifdef Q_BACKINGSTORE_SUBSURFACES
            r.translate(painterOffset());
#endif
            p.fillRect(r, blank);
        }
    }
    QWSWindowSurface::beginPaint(rgn);
}

// from qwindowsurface.cpp
extern void qt_scrollRectInImage(QImage &img, const QRect &rect, const QPoint &offset);

bool QWSMemorySurface::scroll(const QRegion &area, int dx, int dy)
{
    const QVector<QRect> rects = area.rects();
    for (int i = 0; i < rects.size(); ++i)
        qt_scrollRectInImage(img, rects.at(i), QPoint(dx, dy));

    return true;
}

QPoint QWSMemorySurface::painterOffset() const
{
    const QWidget *w = window();
    if (!w)
        return QPoint();

    if (w->mask().isEmpty())
        return QWSWindowSurface::painterOffset();

    const QRegion region = w->mask()
                           & w->frameGeometry().translated(-w->geometry().topLeft());
    return -region.boundingRect().topLeft();
}

QWSLocalMemSurface::QWSLocalMemSurface()
    : QWSMemorySurface(), mem(0), memsize(0)
{
}

QWSLocalMemSurface::QWSLocalMemSurface(QWidget *w)
    : QWSMemorySurface(w), mem(0), memsize(0)
{
}

QWSLocalMemSurface::~QWSLocalMemSurface()
{
    if (memsize)
        delete[] mem;
}

void QWSLocalMemSurface::setGeometry(const QRect &rect)
{
    QSize size = rect.size();

    QWidget *win = window();
    if (win && !win->mask().isEmpty()) {
        const QRegion region = win->mask()
                               & rect.translated(-win->geometry().topLeft());
        size = region.boundingRect().size();
    }

    uchar *deleteLater = 0;

    if (img.size() != size) {
        if (size.isEmpty()) {
            if (memsize) {
                // In case of a Hide event we need to delete the memory after sending the
                // event to the server in order to let the server animate the event.
                deleteLater = mem;
                memsize = 0;
            }
            mem = 0;
            img = QImage();
        } else {
            const QImage::Format format = preferredImageFormat(win);
            const int bpl = nextMulOf4(bytesPerPixel(format) * size.width());
            const int imagesize = bpl * size.height();
            if (memsize < imagesize) {
                delete[] mem;
                memsize = imagesize;
                mem = new uchar[memsize];
            }
            img = QImage(mem, size.width(), size.height(), bpl, format);
            setImageMetrics(img, win);
        }
    }

    QWSWindowSurface::setGeometry(rect);

    delete[] deleteLater;
}

QByteArray QWSLocalMemSurface::permanentState() const
{
    QByteArray array(sizeof(uchar*) + 3 * sizeof(int) + sizeof(SurfaceFlags), Qt::Uninitialized);

    char *ptr = array.data();

    *reinterpret_cast<uchar**>(ptr) = mem;
    ptr += sizeof(uchar*);

    reinterpret_cast<int*>(ptr)[0] = img.width();
    reinterpret_cast<int*>(ptr)[1] = img.height();
    ptr += 2 * sizeof(int);

    *reinterpret_cast<int *>(ptr) = img.format();
    ptr += sizeof(int);

    *reinterpret_cast<SurfaceFlags*>(ptr) = surfaceFlags();

    return array;
}

void QWSLocalMemSurface::setPermanentState(const QByteArray &data)
{
    if (memsize) {
        delete[] mem;
        memsize = 0;
    }

    int width;
    int height;
    QImage::Format format;
    SurfaceFlags flags;

    const char *ptr = data.constData();

    mem = *reinterpret_cast<uchar* const*>(ptr);
    ptr += sizeof(uchar*);

    width = reinterpret_cast<const int*>(ptr)[0];
    height = reinterpret_cast<const int*>(ptr)[1];
    ptr += 2 * sizeof(int);

    format = QImage::Format(*reinterpret_cast<const int*>(ptr));
    ptr += sizeof(int);

    flags = *reinterpret_cast<const SurfaceFlags*>(ptr);

    const int bpl = nextMulOf4(bytesPerPixel(format) * width);
    QWSMemorySurface::img = QImage(mem, width, height, bpl, format);
    setSurfaceFlags(flags);
}

void QWSLocalMemSurface::releaseSurface()
{
    if (memsize) {
        delete[] mem;
        memsize = 0;
    }
    mem = 0;
    img = QImage();
}

#ifndef QT_NO_QWS_MULTIPROCESS

QWSSharedMemSurface::QWSSharedMemSurface()
    : QWSMemorySurface()
{
}

QWSSharedMemSurface::QWSSharedMemSurface(QWidget *widget)
    : QWSMemorySurface(widget)
{
}

QWSSharedMemSurface::~QWSSharedMemSurface()
{
    // mem.detach() is done automatically by ~QSharedMemory
}

bool QWSSharedMemSurface::setMemory(int memId)
{
    if (mem.id() == memId)
        return true;

    mem.detach();

    if (memId != -1 && !mem.attach(memId)) {
#ifndef QT_NO_DEBUG
        perror("QWSSharedMemSurface: attaching to shared memory");
        qCritical("QWSSharedMemSurface: Error attaching to shared memory 0x%x", memId);
#endif
        return false;
    }

    return true;
}

#ifdef QT_QWS_CLIENTBLIT
void QWSSharedMemSurface::setDirectRegion(const QRegion &r, int id)
{
    QWSMemorySurface::setDirectRegion(r, id);
    if (mem.address())
        *(uint *)mem.address() = id;
}

const QRegion QWSSharedMemSurface::directRegion() const
{
    if (mem.address() && *(uint *)mem.address() == uint(directRegionId()))
        return QWSMemorySurface::directRegion();
    return QRegion();
}
#endif

void QWSSharedMemSurface::setPermanentState(const QByteArray &data)
{
    int memId;
    int width;
    int height;
    int lockId;
    QImage::Format format;
    SurfaceFlags flags;

    const int *ptr = reinterpret_cast<const int*>(data.constData());

    memId = ptr[0];
    width = ptr[1];
    height = ptr[2];
    lockId = ptr[3];
    format = QImage::Format(ptr[4]);
    flags = SurfaceFlags(ptr[5]);

    setSurfaceFlags(flags);
    setMemory(memId);
    setLock(lockId);

#ifdef QT_QWS_CLIENTBLIT
    uchar *base = static_cast<uchar*>(mem.address()) + sizeof(uint);
#else
    uchar *base = static_cast<uchar*>(mem.address());
#endif
    const int bpl = nextMulOf4(bytesPerPixel(format) * width);
    QWSMemorySurface::img = QImage(base, width, height, bpl, format);
}

void QWSSharedMemSurface::setGeometry(const QRect &rect)
{
    const QSize size = rect.size();
    if (img.size() != size) {
        if (size.isEmpty()) {
            mem.detach();
            img = QImage();
        } else {
            QWidget *win = window();
            const QImage::Format format = preferredImageFormat(win);
            const int bpl = nextMulOf4(bytesPerPixel(format) * size.width());
#ifdef QT_QWS_CLIENTBLIT
            const int imagesize = bpl * size.height() + sizeof(uint);
#else
            const int imagesize = bpl * size.height();
#endif
            if (mem.size() < imagesize) {
                mem.detach();
                if (!mem.create(imagesize)) {
                    perror("QWSSharedMemSurface::setGeometry allocating shared memory");
                    qFatal("Error creating shared memory of size %d", imagesize);
                }
            }
#ifdef QT_QWS_CLIENTBLIT
            *((uint *)mem.address()) = 0;
            uchar *base = static_cast<uchar*>(mem.address()) + sizeof(uint);
#else
            uchar *base = static_cast<uchar*>(mem.address());
#endif
            img = QImage(base, size.width(), size.height(), bpl, format);
            setImageMetrics(img, win);
        }
    }

    QWSWindowSurface::setGeometry(rect);
}

QByteArray QWSSharedMemSurface::permanentState() const
{
    QByteArray array(6 * sizeof(int), Qt::Uninitialized);

    int *ptr = reinterpret_cast<int*>(array.data());

    ptr[0] = mem.id();
    ptr[1] = img.width();
    ptr[2] = img.height();
    ptr[3] = (memlock ? memlock->id() : -1);
    ptr[4] = int(img.format());
    ptr[5] = int(surfaceFlags());

    return array;
}

void QWSSharedMemSurface::releaseSurface()
{
    mem.detach();
    img = QImage();
}

#endif // QT_NO_QWS_MULTIPROCESS

#ifndef QT_NO_PAINTONSCREEN

QWSOnScreenSurface::QWSOnScreenSurface(QWidget *w)
    : QWSMemorySurface(w)
{
    attachToScreen(getScreen(w));
    setSurfaceFlags(Opaque);
}

QWSOnScreenSurface::QWSOnScreenSurface()
    : QWSMemorySurface()
{
    setSurfaceFlags(Opaque);
}

void QWSOnScreenSurface::attachToScreen(const QScreen *s)
{
    screen = s;
    uchar *base = screen->base();
    QImage::Format format  = screen->pixelFormat();

    if (format == QImage::Format_Invalid || format == QImage::Format_Indexed8) {
        //### currently we have no paint engine for indexed image formats
        qFatal("QWSOnScreenSurface::attachToScreen(): screen depth %d "
               "not implemented", screen->depth());
        return;
    }
    QWSMemorySurface::img = QImage(base, screen->width(), screen->height(),
                                   screen->linestep(), format );
}

QWSOnScreenSurface::~QWSOnScreenSurface()
{
}

QPoint QWSOnScreenSurface::painterOffset() const
{
    return geometry().topLeft() + QWSWindowSurface::painterOffset();
}

bool QWSOnScreenSurface::isValid() const
{
    const QWidget *win = window();
    if (screen != getScreen(win))
        return false;
    if (img.isNull())
        return false;
    return QScreen::isWidgetPaintOnScreen(win);
}

QByteArray QWSOnScreenSurface::permanentState() const
{
    QByteArray array(sizeof(int), Qt::Uninitialized);

    int *ptr = reinterpret_cast<int*>(array.data());
    ptr[0] = QApplication::desktop()->screenNumber(window());
    return array;
}

void QWSOnScreenSurface::setPermanentState(const QByteArray &data)
{
    const int *ptr = reinterpret_cast<const int*>(data.constData());
    const int screenNo = ptr[0];

    QScreen *screen = qt_screen;
    if (screenNo > 0)
        screen = qt_screen->subScreens().at(screenNo);
    attachToScreen(screen);
}

#endif // QT_NO_PAINTONSCREEN

#ifndef QT_NO_PAINT_DEBUG

QWSYellowSurface::QWSYellowSurface(bool isClient)
    : QWSWindowSurface(), delay(10)
{
    if (isClient) {
        setWinId(QWidget::qwsDisplay()->takeId());
        QWidget::qwsDisplay()->nameRegion(winId(),
                                          QLatin1String("Debug flush paint"),
                                          QLatin1String("Silly yellow thing"));
        QWidget::qwsDisplay()->setAltitude(winId(), 1, true);
    }
    setSurfaceFlags(Buffered);
}

QWSYellowSurface::~QWSYellowSurface()
{
}

QByteArray QWSYellowSurface::permanentState() const
{
    QByteArray array(2 * sizeof(int), Qt::Uninitialized);

    int *ptr = reinterpret_cast<int*>(array.data());
    ptr[0] = surfaceSize.width();
    ptr[1] = surfaceSize.height();

    return array;
}

void QWSYellowSurface::setPermanentState(const QByteArray &data)
{
    const int *ptr = reinterpret_cast<const int*>(data.constData());

    const int width = ptr[0];
    const int height = ptr[1];

    img = QImage(width, height, QImage::Format_ARGB32);
    img.fill(qRgba(255,255,31,127));
}

void QWSYellowSurface::flush(QWidget *widget, const QRegion &region,
                             const QPoint &offset)
{
    Q_UNUSED(offset);

    QWSDisplay *display = QWidget::qwsDisplay();
    QRegion rgn = region;

    if (widget)
        rgn.translate(widget->mapToGlobal(QPoint(0, 0)));

    surfaceSize = region.boundingRect().size();

    const int id = winId();
    display->requestRegion(id, key(), permanentState(), rgn);
    display->setAltitude(id, 1, true);
    display->repaintRegion(id, 0, false, rgn);

    ::usleep(500 * delay);
    display->requestRegion(id, key(), permanentState(), QRegion());
    ::usleep(500 * delay);
}

#endif // QT_NO_PAINT_DEBUG

#ifndef QT_NO_DIRECTPAINTER

static inline QScreen *getPrimaryScreen()
{
    QScreen *screen = QScreen::instance();
    if (!screen->base()) {
        QList<QScreen*> subScreens = screen->subScreens();
        if (subScreens.size() < 1)
            return 0;
        screen = subScreens.at(0);
    }
    return screen;
}

QWSDirectPainterSurface::QWSDirectPainterSurface(bool isClient,
                                                 QDirectPainter::SurfaceFlag flags)
    : QWSWindowSurface(), flushingRegionEvents(false), doLocking(false)
{
    setSurfaceFlags(Opaque);
    synchronous = (flags == QDirectPainter::ReservedSynchronous);

    if (isClient) {
        setWinId(QWidget::qwsDisplay()->takeId());
        QWidget::qwsDisplay()->nameRegion(winId(),
                                          QLatin1String("QDirectPainter reserved space"),
                                          QLatin1String("reserved"));
    } else {
        setWinId(0);
    }
    _screen = QScreen::instance();
    if (!_screen->base()) {
        QList<QScreen*> subScreens = _screen->subScreens();
        if (subScreens.size() < 1)
            _screen = 0;
        else
            _screen = subScreens.at(0);
    }
}

QWSDirectPainterSurface::~QWSDirectPainterSurface()
{
    if (winId() && QWSDisplay::instance()) // make sure not in QApplication destructor
        QWidget::qwsDisplay()->destroyRegion(winId());
}

void QWSDirectPainterSurface::setRegion(const QRegion &region)
{
    const int id = winId();
    QWidget::qwsDisplay()->requestRegion(id, key(), permanentState(), region);
#ifndef QT_NO_QWS_MULTIPROCESS
    if (synchronous)
        QWSDisplay::instance()->d->waitForRegionAck(id);
#endif
}

void QWSDirectPainterSurface::flush(QWidget *, const QRegion &r, const QPoint &)
{
    QWSDisplay::instance()->repaintRegion(winId(), 0, true, r);
}

QByteArray QWSDirectPainterSurface::permanentState() const
{
    QByteArray res;
    if (isRegionReserved())
        res.append( 'r');
    return res;
}

void QWSDirectPainterSurface::setPermanentState(const QByteArray &ba)
{
    if (ba.size() > 0 && ba.at(0) == 'r')
        setReserved();
    setSurfaceFlags(surfaceFlags() | Opaque);
}

void QWSDirectPainterSurface::beginPaint(const QRegion &region)
{
    QWSWindowSurface::beginPaint(region);
#ifndef QT_NO_QWS_MULTIPROCESS
    if (!synchronous) {
        flushingRegionEvents = true;
        QWSDisplay::instance()->d->waitForRegionEvents(winId(), doLocking);
        flushingRegionEvents = false;
    }
#endif
}

bool QWSDirectPainterSurface::hasPendingRegionEvents() const
{
#ifndef QT_NO_QWS_MULTIPROCESS
    if (synchronous)
        return false;

    return QWSDisplay::instance()->d->hasPendingRegionEvents();
#else
    return false;
#endif
}

bool QWSDirectPainterSurface::lock(int timeout)
{
#ifndef QT_NO_THREAD
    threadLock.lock();
#endif
    Q_UNUSED(timeout);
    if (doLocking)
        QWSDisplay::grab(true);
    return true;
}

void QWSDirectPainterSurface::unlock()
{
    if (doLocking)
        QWSDisplay::ungrab();
#ifndef QT_NO_THREAD
    threadLock.unlock();
#endif
}

#endif // QT_NO_DIRECTPAINTER

QT_END_NAMESPACE