qscreentransformed_qws.cpp

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#include "qscreentransformed_qws.h"

#ifndef QT_NO_QWS_TRANSFORMED
#include <qscreendriverfactory_qws.h>
#include <qvector.h>
#include <private/qpainter_p.h>
#include <private/qmemrotate_p.h>
#include <qmatrix.h>

#include <unistd.h>
#include <sys/ioctl.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/mman.h>
#include <fcntl.h>
#include <errno.h>

#include <qwindowsystem_qws.h>
#include <qwsdisplay_qws.h>

QT_BEGIN_NAMESPACE

//#define QT_REGION_DEBUG

#ifdef QT_REGION_DEBUG
#include <QDebug>
#endif

class QTransformedScreenPrivate
{
public:
    QTransformedScreenPrivate(QTransformedScreen *parent);

    void configure();

    QTransformedScreen::Transformation transformation;
#ifdef QT_QWS_DEPTH_GENERIC
    bool doGenericColors;
#endif
    QTransformedScreen *q;
};

QTransformedScreenPrivate::QTransformedScreenPrivate(QTransformedScreen *parent)
    : transformation(QTransformedScreen::None),
#ifdef QT_QWS_DEPTH_GENERIC
      doGenericColors(false),
#endif
      q(parent)
{
}

extern "C"
#ifndef QT_BUILD_GUI_LIB
Q_DECL_EXPORT
#endif
void qws_setScreenTransformation(QScreen *that, int t)
{
    QTransformedScreen *tscreen = static_cast<QTransformedScreen*>(that);
    tscreen->setTransformation((QTransformedScreen::Transformation)t);
}

// ---------------------------------------------------------------------------
// Transformed Screen
// ---------------------------------------------------------------------------

QTransformedScreen::QTransformedScreen(int displayId)
    : QProxyScreen(displayId, QScreen::TransformedClass)
{
    d_ptr = new QTransformedScreenPrivate(this);
    d_ptr->transformation = None;

#ifdef QT_REGION_DEBUG
    qDebug() << "QTransformedScreen::QTransformedScreen";
#endif
}

void QTransformedScreenPrivate::configure()
{
    // ###: works because setTransformation recalculates unconditionally
    q->setTransformation(transformation);
}

QTransformedScreen::~QTransformedScreen()
{
    delete d_ptr;
}

static int getDisplayId(const QString &spec)
{
    QRegExp regexp(QLatin1String(":(\\d+)\\b"));
    if (regexp.lastIndexIn(spec) != -1) {
        const QString capture = regexp.cap(1);
        return capture.toInt();
    }
    return 0;
}

static QTransformedScreen::Transformation filterTransformation(QString &spec)
{
    QRegExp regexp(QLatin1String("\\bRot(\\d+):?\\b"), Qt::CaseInsensitive);
    if (regexp.indexIn(spec) == -1)
        return QTransformedScreen::None;

    const int degrees = regexp.cap(1).toInt();
    spec.remove(regexp.pos(0), regexp.matchedLength());

    return static_cast<QTransformedScreen::Transformation>(degrees / 90);
}

bool QTransformedScreen::connect(const QString &displaySpec)
{
    QString dspec = displaySpec.trimmed();
    if (dspec.startsWith(QLatin1String("Transformed:"), Qt::CaseInsensitive))
        dspec = dspec.mid(QString::fromLatin1("Transformed:").size());
    else if (!dspec.compare(QLatin1String("Transformed"), Qt::CaseInsensitive))
        dspec = QString();

    const QString displayIdSpec = QString::fromLatin1(" :%1").arg(displayId);
    if (dspec.endsWith(displayIdSpec))
        dspec = dspec.left(dspec.size() - displayIdSpec.size());

    d_ptr->transformation = filterTransformation(dspec);

    QString driver = dspec;
    int colon = driver.indexOf(QLatin1Char(':'));
    if (colon >= 0)
        driver.truncate(colon);

    if (!QScreenDriverFactory::keys().contains(driver, Qt::CaseInsensitive))
        if (!dspec.isEmpty())
            dspec.prepend(QLatin1Char(':'));

    const int id = getDisplayId(dspec);
    QScreen *s = qt_get_screen(id, dspec.toLatin1().constData());
    setScreen(s);

#ifdef QT_QWS_DEPTH_GENERIC
    d_ptr->doGenericColors = dspec.contains(QLatin1String("genericcolors"));
#endif

    d_ptr->configure();

    // XXX
    qt_screen = this;

    return true;
}

QTransformedScreen::Transformation QTransformedScreen::transformation() const
{
    return d_ptr->transformation;
}

int QTransformedScreen::transformOrientation() const
{
    return (int)d_ptr->transformation;
}

void QTransformedScreen::exposeRegion(QRegion region, int changing)
{
    if (!data || d_ptr->transformation == None) {
        QProxyScreen::exposeRegion(region, changing);
        return;
    }
    QScreen::exposeRegion(region, changing);
}

void QTransformedScreen::setTransformation(Transformation transformation)
{
    d_ptr->transformation = transformation;
    QSize size = mapFromDevice(QSize(dw, dh));
    w = size.width();
    h = size.height();

    const QScreen *s = screen();
    size = mapFromDevice(QSize(s->physicalWidth(), s->physicalHeight()));
    physWidth = size.width();
    physHeight = size.height();

#ifdef QT_REGION_DEBUG
    qDebug() << "QTransformedScreen::setTransformation" << transformation
             << "size" << w << h << "dev size" << dw << dh;
#endif

}

static inline QRect correctNormalized(const QRect &r) {
    const int x1 = qMin(r.left(), r.right());
    const int x2 = qMax(r.left(), r.right());
    const int y1 = qMin(r.top(), r.bottom());
    const int y2 = qMax(r.top(), r.bottom());

    return QRect( QPoint(x1,y1), QPoint(x2,y2) );
}

template <class DST, class SRC>
static inline void blit90(QScreen *screen, const QImage &image,
                          const QRect &rect, const QPoint &topLeft)
{
    const SRC *src = (const SRC*)(image.scanLine(rect.top())) + rect.left();
    DST *dest = (DST*)(screen->base() + topLeft.y() * screen->linestep())
                + topLeft.x();
    qt_memrotate90(src, rect.width(), rect.height(), image.bytesPerLine(),
                   dest, screen->linestep());
}

template <class DST, class SRC>
static inline void blit180(QScreen *screen, const QImage &image,
                           const QRect &rect, const QPoint &topLeft)
{
    const SRC *src = (const SRC*)(image.scanLine(rect.top())) + rect.left();
    DST *dest = (DST*)(screen->base() + topLeft.y() * screen->linestep())
                + topLeft.x();
    qt_memrotate180(src, rect.width(), rect.height(), image.bytesPerLine(),
                    dest, screen->linestep());
}

template <class DST, class SRC>
static inline void blit270(QScreen *screen, const QImage &image,
                           const QRect &rect, const QPoint &topLeft)
{
    const SRC *src = (const SRC *)(image.scanLine(rect.top())) + rect.left();
    DST *dest = (DST*)(screen->base() + topLeft.y() * screen->linestep())
                + topLeft.x();
    qt_memrotate270(src, rect.width(), rect.height(), image.bytesPerLine(),
                    dest, screen->linestep());
}

typedef void (*BlitFunc)(QScreen *, const QImage &, const QRect &, const QPoint &);

#define SET_BLIT_FUNC(dst, src, rotation, func) \
do {                                            \
    switch (rotation) {                         \
    case Rot90:                                 \
        func = blit90<dst, src>;                \
        break;                                  \
    case Rot180:                                \
        func = blit180<dst, src>;               \
        break;                                  \
    case Rot270:                                \
        func = blit270<dst, src>;               \
        break;                                  \
    default:                                    \
        break;                                  \
    }                                           \
} while (0)

void QTransformedScreen::blit(const QImage &image, const QPoint &topLeft,
                              const QRegion &region)
{
    const Transformation trans = d_ptr->transformation;
    if (trans == None) {
        QProxyScreen::blit(image, topLeft, region);
        return;
    }

    const QVector<QRect> rects = region.rects();
    const QRect bound = QRect(0, 0, QScreen::w, QScreen::h)
                        & QRect(topLeft, image.size());

    BlitFunc func = 0;
#ifdef QT_QWS_DEPTH_GENERIC
    if (d_ptr->doGenericColors && depth() == 16) {
        if (image.depth() == 16)
            SET_BLIT_FUNC(qrgb_generic16, quint16, trans, func);
        else
            SET_BLIT_FUNC(qrgb_generic16, quint32, trans, func);
    } else
#endif
    switch (depth()) {
#ifdef QT_QWS_DEPTH_32
    case 32:
#ifdef QT_QWS_DEPTH_16
        if (image.depth() == 16)
            SET_BLIT_FUNC(quint32, quint16, trans, func);
        else
#endif
            SET_BLIT_FUNC(quint32, quint32, trans, func);
        break;
#endif
#if defined(QT_QWS_DEPTH_24) || defined(QT_QWS_DEPTH18)
    case 24:
    case 18:
        SET_BLIT_FUNC(quint24, quint24, trans, func);
        break;
#endif
#if defined(QT_QWS_DEPTH_16) || defined(QT_QWS_DEPTH_15) || defined(QT_QWS_DEPTH_12)
    case 16:
#if defined QT_QWS_ROTATE_BGR
        if (pixelType() == BGRPixel && image.depth() == 16) {
            SET_BLIT_FUNC(qbgr565, quint16, trans, func);
            break;
        } //fall-through here!!!
#endif
    case 15:
#if defined QT_QWS_ROTATE_BGR
        if (pixelType() == BGRPixel && image.format() == QImage::Format_RGB555) {
            SET_BLIT_FUNC(qbgr555, qrgb555, trans, func);
            break;
        } //fall-through here!!!
#endif
    case 12:
        if (image.depth() == 16)
            SET_BLIT_FUNC(quint16, quint16, trans, func);
        else
            SET_BLIT_FUNC(quint16, quint32, trans, func);
        break;
#endif
#ifdef QT_QWS_DEPTH_8
    case 8:
        if (image.format() == QImage::Format_RGB444)
            SET_BLIT_FUNC(quint8, qrgb444, trans, func);
        else if (image.depth() == 16)
            SET_BLIT_FUNC(quint8, quint16, trans, func);
        else
            SET_BLIT_FUNC(quint8, quint32, trans, func);
        break;
#endif
    default:
        return;
    }
    if (!func)
        return;

    QWSDisplay::grab();
    for (int i = 0; i < rects.size(); ++i) {
        const QRect r = rects.at(i) & bound;

        QPoint dst;
        switch (trans) {
        case Rot90:
            dst = mapToDevice(r.topRight(), QSize(w, h));
            break;
        case Rot180:
            dst = mapToDevice(r.bottomRight(), QSize(w, h));
            break;
        case Rot270:
            dst = mapToDevice(r.bottomLeft(), QSize(w, h));
            break;
        default:
            break;
        }
        func(this, image, r.translated(-topLeft), dst);
    }
    QWSDisplay::ungrab();

}

void QTransformedScreen::solidFill(const QColor &color, const QRegion &region)
{
    const QRegion tr = mapToDevice(region, QSize(w,h));

    Q_ASSERT(tr.boundingRect() == mapToDevice(region.boundingRect(), QSize(w,h)));

#ifdef QT_REGION_DEBUG
    qDebug() << "QTransformedScreen::solidFill region" << region << "transformed" << tr;
#endif
    QProxyScreen::solidFill(color, tr);
}

QSize QTransformedScreen::mapToDevice(const QSize &s) const
{
    switch (d_ptr->transformation) {
    case None:
    case Rot180:
        break;
    case Rot90:
    case Rot270:
        return QSize(s.height(), s.width());
        break;
    }
    return s;
}

QSize QTransformedScreen::mapFromDevice(const QSize &s) const
{
    switch (d_ptr->transformation) {
    case None:
    case Rot180:
        break;
    case Rot90:
    case Rot270:
        return QSize(s.height(), s.width());
        break;
    }
    return s;
}

QPoint QTransformedScreen::mapToDevice(const QPoint &p, const QSize &s) const
{
    QPoint rp(p);

    switch (d_ptr->transformation) {
    case None:
        break;
    case Rot90:
        rp.setX(p.y());
        rp.setY(s.width() - p.x() - 1);
        break;
    case Rot180:
        rp.setX(s.width() - p.x() - 1);
        rp.setY(s.height() - p.y() - 1);
        break;
    case Rot270:
        rp.setX(s.height() - p.y() - 1);
        rp.setY(p.x());
        break;
    }

    return rp;
}

QPoint QTransformedScreen::mapFromDevice(const QPoint &p, const QSize &s) const
{
    QPoint rp(p);

    switch (d_ptr->transformation) {
    case None:
        break;
    case Rot90:
        rp.setX(s.height() - p.y() - 1);
        rp.setY(p.x());
        break;
    case Rot180:
        rp.setX(s.width() - p.x() - 1);
        rp.setY(s.height() - p.y() - 1);
        break;
    case Rot270:
        rp.setX(p.y());
        rp.setY(s.width() - p.x() - 1);
        break;
    }

    return rp;
}

QRect QTransformedScreen::mapToDevice(const QRect &r, const QSize &s) const
{
    if (r.isNull())
        return QRect();

    QRect tr;
    switch (d_ptr->transformation) {
    case None:
        tr = r;
        break;
    case Rot90:
        tr.setCoords(r.y(), s.width() - r.x() - 1,
                     r.bottom(), s.width() - r.right() - 1);
        break;
    case Rot180:
        tr.setCoords(s.width() - r.x() - 1, s.height() - r.y() - 1,
                     s.width() - r.right() - 1, s.height() - r.bottom() - 1);
        break;
    case Rot270:
        tr.setCoords(s.height() - r.y() - 1, r.x(),
                     s.height() - r.bottom() - 1, r.right());
        break;
    }

    return correctNormalized(tr);
}

QRect QTransformedScreen::mapFromDevice(const QRect &r, const QSize &s) const
{
    if (r.isNull())
        return QRect();

    QRect tr;
    switch (d_ptr->transformation) {
    case None:
        tr = r;
        break;
    case Rot90:
        tr.setCoords(s.height() - r.y() - 1, r.x(),
                     s.height() - r.bottom() - 1, r.right());
        break;
    case Rot180:
        tr.setCoords(s.width() - r.x() - 1, s.height() - r.y() - 1,
                     s.width() - r.right() - 1, s.height() - r.bottom() - 1);
        break;
    case Rot270:
        tr.setCoords(r.y(), s.width() - r.x() - 1,
                     r.bottom(), s.width() - r.right() - 1);
        break;
    }

    return correctNormalized(tr);
}

QRegion QTransformedScreen::mapToDevice(const QRegion &rgn, const QSize &s) const
{
    if (d_ptr->transformation == None)
        return QProxyScreen::mapToDevice(rgn, s);

#ifdef QT_REGION_DEBUG
    qDebug() << "mapToDevice size" << s << "rgn:  " << rgn;
#endif
    QRect tr;
    QRegion trgn;
    QVector<QRect> a = rgn.rects();
    const QRect *r = a.data();

    int w = s.width();
    int h = s.height();
    int size = a.size();

    switch (d_ptr->transformation) {
    case None:
        break;
    case Rot90:
        for (int i = 0; i < size; i++, r++) {
            tr.setCoords(r->y(), w - r->x() - 1,
                         r->bottom(), w - r->right() - 1);
            trgn |= correctNormalized(tr);
        }
        break;
    case Rot180:
        for (int i = 0; i < size; i++, r++) {
            tr.setCoords(w - r->x() - 1, h - r->y() - 1,
                         w - r->right() - 1, h - r->bottom() - 1);
            trgn |= correctNormalized(tr);
        }
        break;
    case Rot270:
        for (int i = 0; i < size; i++, r++) {
            tr.setCoords(h - r->y() - 1, r->x(),
                         h - r->bottom() - 1, r->right());
            trgn |= correctNormalized(tr);
        }
        break;
    }
#ifdef QT_REGION_DEBUG
    qDebug() << "mapToDevice trgn:  " << trgn;
#endif
    return trgn;
}

QRegion QTransformedScreen::mapFromDevice(const QRegion &rgn, const QSize &s) const
{
    if (d_ptr->transformation == None)
        return QProxyScreen::mapFromDevice(rgn, s);

#ifdef QT_REGION_DEBUG
    qDebug() << "fromDevice: realRegion count:  " << rgn.rects().size() << " isEmpty? " << rgn.isEmpty() << "  bounds:" << rgn.boundingRect();
#endif
    QRect tr;
    QRegion trgn;
    QVector<QRect> a = rgn.rects();
    const QRect *r = a.data();

    int w = s.width();
    int h = s.height();
    int size = a.size();

    switch (d_ptr->transformation) {
    case None:
        break;
    case Rot90:
        for (int i = 0; i < size; i++, r++) {
            tr.setCoords(h - r->y() - 1, r->x(),
                         h - r->bottom() - 1, r->right());
            trgn |= correctNormalized(tr);
        }
        break;
    case Rot180:
        for (int i = 0; i < size; i++, r++) {
            tr.setCoords(w - r->x() - 1, h - r->y() - 1,
                         w - r->right() - 1, h - r->bottom() - 1);
            trgn |= correctNormalized(tr);
        }
        break;
    case Rot270:
        for (int i = 0; i < size; i++, r++) {
            tr.setCoords(r->y(), w - r->x() - 1,
                         r->bottom(), w - r->right() - 1);
            trgn |= correctNormalized(tr);
        }
        break;
    }
#ifdef QT_REGION_DEBUG
    qDebug() << "fromDevice: transRegion count: " << trgn.rects().size() << " isEmpty? " << trgn.isEmpty() << "  bounds:" << trgn.boundingRect();
#endif
    return trgn;
}

void QTransformedScreen::setDirty(const QRect& rect)
{
    const QRect r = mapToDevice(rect, QSize(width(), height()));
    QProxyScreen::setDirty(r);
}

QRegion QTransformedScreen::region() const
{
    QRegion deviceRegion = QProxyScreen::region();
    return mapFromDevice(deviceRegion, QSize(deviceWidth(), deviceHeight()));
}

QT_END_NAMESPACE

#endif // QT_NO_QWS_TRANSFORMED