qscreen_qws.cpp

奇趣公司比较新的qt/emd版本

        driver.truncate(colon);
    driver = driver.trimmed();

    bool foundDriver = false;
    QString driverName = driver;

    QStringList driverList;
    if (!driver.isEmpty())
        driverList << driver;
    else
        driverList = QScreenDriverFactory::keys();

    for (int i = 0; i < driverList.size(); ++i) {
        const QString driverName = driverList.at(i);
        qt_screen = QScreenDriverFactory::create(driverName, display_id);
        if (qt_screen) {
            foundDriver = true;
            if (qt_screen->connect(displaySpec)) {
                return qt_screen;
            } else {
                delete qt_screen;
                qt_screen = 0;
            }
        }
    }

    if (driver.isNull())
        qFatal("No suitable driver found");
    else if (foundDriver)
        qFatal("%s: driver cannot connect", driver.toLatin1().constData());
    else
        qFatal("%s: driver not found", driver.toLatin1().constData());

    return 0;
}


/*!
    \fn void QScreen::exposeRegion(QRegion region, int windowIndex)

    This function is called by the \l {Qtopia Core} server whenever a
    screen update is required. \a region is the area on the screen
    that must be updated, and \a windowIndex is the index into
    QWSServer::clientWindows() of the window that required the
    update. QWSWindow::state() gives more information about the cause.

    The default implementation composes the
    affected windows and paints the given \a region on screen by
    calling the blit() and solidFill() functions

    This function can be reimplemented to perform composition in
    hardware, or to perform transition effects.
    For simpler hardware acceleration, or to interface with
    this is typically done by reimplementing the blit() and
    solidFill() functions instead.

    Note that there is no need to call this function explicitly.

    \sa blit(), solidFill(), blank()
*/
void QScreen::exposeRegion(QRegion r, int windowIndex)
{
    r &= region();
    if (r.isEmpty())
        return;

    int changing = windowIndex;
    // when we have just lowered a window, we have to expose all the windows below where the
    // window used to be.
    if (changing && qwsServer->clientWindows().at(changing)->state() == QWSWindow::Lowering)
        changing = 0;
#ifdef QTOPIA_PERFTEST
    static enum { PerfTestUnknown, PerfTestOn, PerfTestOff } perfTestState = PerfTestUnknown;
    if(PerfTestUnknown == perfTestState) {
        if(::getenv("QTOPIA_PERFTEST"))
            perfTestState = PerfTestOn;
        else
            perfTestState = PerfTestOff;
    }
    if(PerfTestOn == perfTestState) {
        QWSWindow *changed = qwsServer->clientWindows().at(changing);
        if(!changed->client()->identity().isEmpty())
            qDebug() << "Performance  :  expose_region  :"
                     << changed->client()->identity()
                     << r.boundingRect() << ": "
                     << qPrintable( QTime::currentTime().toString( "h:mm:ss.zzz" ) );
    }
#endif

    const QRect bounds = r.boundingRect();
    QRegion blendRegion;
    QImage blendBuffer;

#ifndef QT_NO_QWS_CURSOR
    if (qt_screencursor && !qt_screencursor->isAccelerated()) {
        blendRegion = r & qt_screencursor->boundingRect();
    }
#endif
    compose(0, r, blendRegion, blendBuffer, changing);

#ifdef QT_EXPERIMENTAL_REGIONS
    if (!blendBuffer.isNull()) {
        const QPoint offset = blendRegion.boundingRect().topLeft();
#ifndef QT_NO_QWS_CURSOR
        if (qt_screencursor && !qt_screencursor->isAccelerated()) {
            const QRect cursorRect = qt_screencursor->boundingRect();
            if (blendRegion.intersects(cursorRect)) {
                //### can be optimized...
                QPainter p(&blendBuffer);
                p.drawImage(cursorRect.topLeft() - offset,
                            qt_screencursor->image());
            }
        }
#endif // QT_NO_QWS_CURSOR
        blit(blendBuffer, offset, blendRegion);
    }
#else
#ifndef QT_NO_QWS_CURSOR
    if (qt_screencursor && !qt_screencursor->isAccelerated() && !blendBuffer.isNull()) {
        //### can be optimized...
        QPainter p(&blendBuffer);
        p.drawImage(qt_screencursor->boundingRect().topLeft() - blendRegion.boundingRect().topLeft(), qt_screencursor->image());
    }
#endif
    if (!blendBuffer.isNull()) {
        //bltToScreen
        QPoint topLeft = blendRegion.boundingRect().topLeft();
        blit(blendBuffer, topLeft, blendRegion);
    }
#endif // QT_EXPERIMENTAL_REGIONS

    const QVector<QRect> rects = r.rects();
    for (int i = 0; i < rects.size(); ++i)
        setDirty(rects.at(i));
}

/*!
    \fn void QScreen::blit(const QImage &image, const QPoint &topLeft, const QRegion &region)

    Copies the given \a region in the given \a image to the point
    specified by \a topLeft using device coordinates.

    This function is called from the exposeRegion() function; it is
    not intended to be called explicitly.

    Reimplement this function to make use of \l {Adding an Accelerated
    Graphics Driver in Qtopia Core}{accelerated hardware}. Note that
    this function must be reimplemented if the framebuffer format is
    not supported by \l {Qtopia Core} (See the \l {Qtopia Core Display
    Management}{Display Management} documentation for more details).

    \sa exposeRegion(), solidFill(), blank()
*/
void QScreen::blit(const QImage &img, const QPoint &topLeft, const QRegion &reg)
{
    const QRect bound = (region() & QRect(topLeft, img.size())).boundingRect();
    QWSDisplay::grab();
    d_ptr->blit(this, img, topLeft - offset(),
                (reg & bound).translated(-topLeft));
    QWSDisplay::ungrab();
}

/*!
    \internal
*/

void QScreen::blit(QWSWindow *win, const QRegion &clip)
{
    QWSWindowSurface *surface = win->windowSurface();
    if (!surface)
        return;

    const QImage &img = surface->image();
    if (img == QImage())
        return;

    const QRegion rgn = clip & win->paintedRegion();
    if (rgn.isEmpty())
        return;

    surface->lock();
    blit(img, win->requestedRegion().boundingRect().topLeft(), rgn);
    surface->unlock();
}

struct fill_data {
    quint32 color;
    uchar *data;
    int lineStep;
    int x;
    int y;
    int w;
    int h;
};

/*!
    Fills the given \a region of the screen with the specified \a
    color.

    This function is called from the exposeRegion() function; it is
    not intended to be called explicitly.

    Reimplement this function to make use of \l {Adding an Accelerated
    Graphics Driver in Qtopia Core}{accelerated hardware}. Note that
    this function must be reimplemented if the framebuffer format is
    not supported by \l {Qtopia Core} (See the \l {Qtopia Core Display
    Management}{Display Management} documentation for more details).

    \sa exposeRegion(), blit(), blank()
*/
// the base class implementation works in device coordinates, so that transformed drivers can use it
void QScreen::solidFill(const QColor &color, const QRegion &region)
{
    QWSDisplay::grab();
    d_ptr->solidFill(this, color,
                     region.translated(-offset()) & QRect(0, 0, dw, dh));
    QWSDisplay::ungrab();
}

/*!
    \since 4.2

    Creates and returns a new window surface matching the given \a
    key. Possible keys include \e OnScreen for an on-screen
    surface, \e mem for a surface constructed from local memory,
    \e shm for a surface constructed from shared memory, \e Yellow
    for a yellow surface, and \e DirectPainter for a direct painter
    surface.

    The server application will call this function whenever it needs
    to create a server side representation of a window, e.g. when
    copying the content of memory to the screen using the screen
    driver.

    Note that this function must be reimplemented when adding an
    accelerated graphics driver. See the \l {Adding an Accelerated
    Graphics Driver in Qtopia Core}{Adding an Accelerated Graphics
    Driver} documentation for details.

    \sa {Qtopia Core Architecture}
*/
QWSWindowSurface* QScreen::createSurface(const QString &key) const
{
#ifndef QT_NO_PAINTONSCREEN
    if (key == QLatin1String("OnScreen"))
        return new QWSOnScreenSurface;
    else
#endif
    if (key == QLatin1String("mem"))
        return new QWSLocalMemSurface;
#ifndef QT_NO_QWS_MULTIPROCESS
    else if (key == QLatin1String("shm"))
        return new QWSSharedMemSurface;
#endif
#ifndef QT_NO_PAINT_DEBUG
    else if (key == QLatin1String("Yellow"))
        return new QWSYellowSurface;
#endif
#ifndef QT_NO_DIRECTPAINTER
    else if (key == QLatin1String("DirectPainter"))
        return new QWSDirectPainterSurface;
#endif

    return 0;
}

#ifndef QT_NO_PAINTONSCREEN
bool QScreen::isWidgetPaintOnScreen(const QWidget *w)
{
    static int doOnScreen = -1;
    if (doOnScreen == -1) {
        const QByteArray env = qgetenv("QT_ONSCREEN_PAINT");
        if (env == "force")
            doOnScreen = 2;
        else
            doOnScreen = (env.toInt() > 0 ? 1 : 0);
    }

    if (doOnScreen == 2) // force
        return true;

    if (doOnScreen == 0 && !w->testAttribute(Qt::WA_PaintOnScreen))
        return false;

    return w->d_func()->isOpaque();
}
#endif

/*!
    \overload

    Creates and returns a new window surface for the given \a widget.
*/
QWSWindowSurface* QScreen::createSurface(QWidget *widget) const
{
#ifndef QT_NO_PAINTONSCREEN
    if (isWidgetPaintOnScreen(widget) && base())
        return new QWSOnScreenSurface(widget);
    else
#endif
    if (QApplication::type() == QApplication::GuiServer)
        return new QWSLocalMemSurface(widget);
#ifndef QT_NO_QWS_MULTIPROCESS
    else
        return new QWSSharedMemSurface(widget);
#endif

    return 0;
}

void QScreen::compose(int level, const QRegion &exposed, QRegion &blend,
                      QImage &blendbuffer, int changing_level)
{
    QRect exposed_bounds = exposed.boundingRect();
    QWSWindow *win = 0;
    do {
        win = qwsServer->clientWindows().value(level); // null is background
        ++level;
    } while (win && !win->paintedRegion().boundingRect().intersects(exposed_bounds));

    QWSWindowSurface *surface = (win ? win->windowSurface() : 0);
    bool above_changing = level <= changing_level; // 0 is topmost

    QRegion exposedBelow = exposed;
    bool opaque = true;

    if (win) {
        opaque = win->isOpaque() || !surface->isBuffered();
        if (opaque) {
            exposedBelow -= win->paintedRegion();
            if (above_changing || !surface->isBuffered())
                blend -= exposed & win->paintedRegion();
        } else {
            blend += exposed & win->paintedRegion();
        }
    }
    if (win && !exposedBelow.isEmpty()) {
        compose(level, exposedBelow, blend, blendbuffer, changing_level);
    } else {
        QSize blendSize = blend.boundingRect().size();
        if (!blendSize.isNull()) {
            blendbuffer = QImage(blendSize,
                                 depth() <= 16 ? QImage::Format_RGB16 : QImage::Format_ARGB32_Premultiplied);
        }
    }

    const QRegion blitRegion = exposed - blend;
    if (!win)
        paintBackground(blitRegion);
    else if (!above_changing && surface->isBuffered())
        blit(win, blitRegion);

    QRegion blendRegion = exposed & blend;

    if (win)
        blendRegion &= win->paintedRegion();
    if (!blendRegion.isEmpty()) {

        QPoint off = blend.boundingRect().topLeft();

        QRasterBuffer rb;
        rb.prepare(&blendbuffer);
        QSpanData spanData;
        spanData.init(&rb);
        if (!win) {
            if (blendbuffer.format() == QImage::Format_ARGB32_Premultiplied)
                spanData.rasterBuffer->compositionMode = QPainter::CompositionMode_Source;
            spanData.setup(qwsServer->backgroundBrush(), 256);
            spanData.dx = off.x();
            spanData.dy = off.y();
        } else if (!surface->isBuffered()) {
                return;
        } else {
            const QImage &img = surface->image();
            QPoint winoff = off - win->requestedRegion().boundingRect().topLeft();
            // convert win->opacity() from scale [0..255] to [0..256]
            int const_alpha = win->opacity();
            const_alpha += (const_alpha >> 7);
            spanData.type = QSpanData::Texture;
            spanData.initTexture(&img, const_alpha);
            spanData.dx = winoff.x();
            spanData.dy = winoff.y();
        }
        if (!spanData.blend)
            return;

        if (surface)
            surface->lock();
        const QVector<QRect> rects = blendRegion.rects();
        const int nspans = 256;
        QT_FT_Span spans[nspans];
        for (int i = 0; i < rects.size(); ++i) {
            int y = rects.at(i).y() - off.y();
            int ye = y + rects.at(i).height();
            int x = rects.at(i).x() - off.x();
            int len = rects.at(i).width();
            while (y < ye) {
                int n = qMin(nspans, ye - y);
                int i = 0;
                while (i < n) {
                    spans[i].x = x;
                    spans[i].len = len;
                    spans[i].y = y + i;
                    spans[i].coverage = 255;
                    ++i;
                }
                spanData.blend(n, spans, &spanData);
                y += n;
            }
        }
        if (surface)
            surface->unlock();
    }
}

void QScreen::paintBackground(const QRegion &r)
{
    const QBrush &bg = qwsServer->backgroundBrush();
    Qt::BrushStyle bs = bg.style();
    if (bs == Qt::NoBrush || r.isEmpty())
        return;

    if (bs == Qt::SolidPattern) {
        solidFill(bg.color(), r);
    } else {
        const QRect br = r.boundingRect();
        QImage img(br.size(), d_ptr->preferredImageFormat());
        QPoint off = br.topLeft();
        QRasterBuffer rb;
        rb.prepare(&img);
        QSpanData spanData;
        spanData.init(&rb);
        spanData.setup(bg, 256);
        spanData.dx = off.x();
        spanData.dy = off.y();
        Q_ASSERT(spanData.blend);

        const QVector<QRect> rects = r.rects();
        const int nspans = 256;
        QT_FT_Span spans[nspans];
        for (int i = 0; i < rects.size(); ++i) {
            int y = rects.at(i).y() - off.y();
            int