source: trunk/src/gui/embedded/qscreen_qws.cpp@ 1123

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**
** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation ([email protected])
**
** This file is part of the QtGui module of the Qt Toolkit.
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** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file.  Please review the following information to
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#include "qplatformdefs.h"
#include "qscreen_qws.h"

#include "qcolormap.h"
#include "qscreendriverfactory_qws.h"
#include "qwindowsystem_qws.h"
#include "qwidget.h"
#include "qcolor.h"
#include "qpixmap.h"
#include "qvarlengtharray.h"
#include "qwsdisplay_qws.h"
#include "qpainter.h"
#include <private/qdrawhelper_p.h>
#include <private/qpaintengine_raster_p.h>
#include <private/qpixmap_raster_p.h>
#include <private/qwindowsurface_qws_p.h>
#include <private/qpainter_p.h>
#include <private/qwidget_p.h>
#include <private/qgraphicssystem_qws_p.h>

QT_BEGIN_NAMESPACE

// #define QT_USE_MEMCPY_DUFF

#ifndef QT_NO_QWS_CURSOR
bool qt_sw_cursor=false;
Q_GUI_EXPORT QScreenCursor * qt_screencursor = 0;
#endif
Q_GUI_EXPORT QScreen * qt_screen = 0;

ClearCacheFunc QScreen::clearCacheFunc = 0;

#ifndef QT_NO_QWS_CURSOR
/*!
    \class QScreenCursor
    \ingroup qws

    \brief The QScreenCursor class is a base class for screen cursors
    in Qt for Embedded Linux.

    Note that this class is non-portable, and that it is only
    available in \l{Qt for Embedded Linux}.

    QScreenCursor implements a software cursor, but can be subclassed
    to support hardware cursors as well. When deriving from the
    QScreenCursor class it is important to maintain the cursor's
    image, position, hot spot (the point within the cursor's image
    that will be the position of the associated mouse events) and
    visibility as well as informing whether it is hardware accelerated
    or not.

    Note that there may only be one screen cursor at a time. Use the
    static instance() function to retrieve a pointer to the current
    screen cursor. Typically, the cursor is constructed by the QScreen
    class or one of its descendants when it is initializing the
    device; the QScreenCursor class should never be instantiated
    explicitly.

    Use the move() function to change the position of the cursor, and
    the set() function to alter its image or its hot spot. In
    addition, you can find out whether the cursor is accelerated or
    not, using the isAccelerated() function, and the boundingRect()
    function returns the cursor's bounding rectangle.

    The cursor's appearance can be controlled using the isVisible(),
    hide() and show() functions; alternatively the QWSServer class
    provides some means of controlling the cursor's appearance using
    the QWSServer::isCursorVisible() and QWSServer::setCursorVisible()
    functions.

    \sa QScreen, QWSServer
*/

/*!
    \fn static QScreenCursor* QScreenCursor::instance()
    \since 4.2

    Returns a pointer to the application's unique screen cursor.
*/

extern bool qws_sw_cursor;

/*!
    Constructs a screen cursor
*/
QScreenCursor::QScreenCursor()
{
    pos = QPoint(qt_screen->deviceWidth()/2, qt_screen->deviceHeight()/2);
    size = QSize(0,0);
    enable = true;
    hwaccel = false;
    supportsAlpha = true;
}

/*!
    Destroys the screen cursor.
*/
QScreenCursor::~QScreenCursor()
{
}

/*!
    Hides the cursor from the screen.

    \sa show()
*/
void QScreenCursor::hide()
{
    if (enable) {
        enable = false;
        if (!hwaccel)
            qt_screen->exposeRegion(boundingRect(), 0);
    }
}

/*!
    Shows the mouse cursor.

    \sa hide()
*/
void QScreenCursor::show()
{
    if (!enable) {
        enable = true;
        if (!hwaccel)
            qt_screen->exposeRegion(boundingRect(), 0);
    }
}

/*!
    Sets the cursor's image to be the given \a image.

    The \a hotx and \a hoty parameters define the cursor's hot spot,
    i.e., the point within the cursor's image that will be the
    position of the associated mouse events.

    \sa move()
*/
void QScreenCursor::set(const QImage &image, int hotx, int hoty)
{
    const QRect r = boundingRect();

    hotspot = QPoint(hotx, hoty);
    // These are in almost all cases the fastest formats to blend
    QImage::Format f;
    switch (qt_screen->depth()) {
    case 12:
        f = QImage::Format_ARGB4444_Premultiplied;
        break;
    case 15:
        f =  QImage::Format_ARGB8555_Premultiplied;
        break;
    case 16:
        f = QImage::Format_ARGB8565_Premultiplied;
        break;
    case 18:
        f = QImage::Format_ARGB6666_Premultiplied;
        break;
    default:
        f =  QImage::Format_ARGB32_Premultiplied;
    }

    cursor = image.convertToFormat(f);

    size = image.size();

    if (enable && !hwaccel)
        qt_screen->exposeRegion(r | boundingRect(), 0);
}

/*!
    Moves the mouse cursor to the given position, i.e., (\a x, \a y).

    Note that the given position defines the top-left corner of the
    cursor's image, i.e., not the cursor's hot spot (the position of
    the associated mouse events).

    \sa set()
*/
void QScreenCursor::move(int x, int y)
{
    QRegion r = boundingRect();
    pos = QPoint(x,y);
    if (enable && !hwaccel) {
        r |= boundingRect();
        qt_screen->exposeRegion(r, 0);
    }
}


/*!
    \fn void QScreenCursor::initSoftwareCursor ()

    Initializes the screen cursor.

    This function is typically called from the screen driver when
    initializing the device. Alternatively, the cursor can be set
    directly using the pointer returned by the static instance()
    function.

    \sa QScreen::initDevice()
*/
void QScreenCursor::initSoftwareCursor()
{
    qt_screencursor = new QScreenCursor;
}


#endif // QT_NO_QWS_CURSOR


/*!
    \fn QRect QScreenCursor::boundingRect () const

    Returns the cursor's bounding rectangle.
*/

/*!
    \internal
    \fn bool QScreenCursor::enabled ()
*/

/*!
    \fn QImage QScreenCursor::image () const

    Returns the cursor's image.
*/


/*!
    \fn bool QScreenCursor::isAccelerated () const

    Returns true if the cursor is accelerated; otherwise false.
*/

/*!
    \fn bool QScreenCursor::isVisible () const

    Returns true if the cursor is visible; otherwise false.
*/

/*!
    \internal
    \fn bool QScreenCursor::supportsAlphaCursor () const
*/

/*
    \variable QScreenCursor::cursor

    \brief the cursor's image.

    \sa image()
*/

/*
    \variable QScreenCursor::size

    \brief the cursor's size
*/

/*
    \variable QScreenCursor::pos

    \brief the cursor's position, i.e., the position of the top-left
    corner of the crsor's image

    \sa set(), move()
*/

/*
    \variable QScreenCursor::hotspot

    \brief the cursor's hotspot, i.e., the point within the cursor's
    image that will be the position of the associated mouse events.

    \sa set(), move()
*/

/*
    \variable QScreenCursor::enable

    \brief whether the cursor is visible or not

    \sa isVisible()
*/

/*
    \variable QScreenCursor::hwaccel

    \brief holds whether the cursor is accelerated or not

    If the cursor is not accelerated, its image will be included by
    the screen when it composites the window surfaces.

    \sa isAccelerated()

*/

/*
    \variable QScreenCursor::supportsAlpha
*/

/*!
    \internal
    \macro qt_screencursor
    \relates QScreenCursor

    A global pointer referring to the unique screen cursor. It is
    equivalent to the pointer returned by the
    QScreenCursor::instance() function.
*/



class QScreenPrivate
{
public:
    QScreenPrivate(QScreen *parent, QScreen::ClassId id = QScreen::CustomClass);
    ~QScreenPrivate();

    inline QImage::Format preferredImageFormat() const;

    typedef void (*SolidFillFunc)(QScreen*, const QColor&, const QRegion&);
    typedef void (*BlitFunc)(QScreen*, const QImage&, const QPoint&, const QRegion&);

    SolidFillFunc solidFill;
    BlitFunc blit;

    QPoint offset;
    QList<QScreen*> subScreens;
    QPixmapDataFactory* pixmapFactory;
    QGraphicsSystem* graphicsSystem;
    QWSGraphicsSystem defaultGraphicsSystem; //###
    QImage::Format pixelFormat;
#if Q_BYTE_ORDER == Q_BIG_ENDIAN
    bool fb_is_littleEndian;
#endif
#ifdef QT_QWS_CLIENTBLIT
    bool supportsBlitInClients;
#endif
    int classId;
    QScreen *q_ptr;
};

template <typename T>
static void solidFill_template(QScreen *screen, const QColor &color,
                               const QRegion &region)
{
    T *dest = reinterpret_cast<T*>(screen->base());
    const T c = qt_colorConvert<T, quint32>(color.rgba(), 0);
    const int stride = screen->linestep();
    const QVector<QRect> rects = region.rects();

    for (int i = 0; i < rects.size(); ++i) {
        const QRect r = rects.at(i);
        qt_rectfill(dest, c, r.x(), r.y(), r.width(), r.height(), stride);
    }
}

#ifdef QT_QWS_DEPTH_GENERIC
static void solidFill_rgb_32bpp(QScreen *screen, const QColor &color,
                                const QRegion &region)
{
    quint32 *dest = reinterpret_cast<quint32*>(screen->base());
    const quint32 c = qt_convertToRgb<quint32>(color.rgba());

    const int stride = screen->linestep();
    const QVector<QRect> rects = region.rects();

    for (int i = 0; i < rects.size(); ++i) {
        const QRect r = rects.at(i);
        qt_rectfill(dest, c, r.x(), r.y(), r.width(), r.height(), stride);
    }
}

static void solidFill_rgb_16bpp(QScreen *screen, const QColor &color,
                                const QRegion &region)
{
    quint16 *dest = reinterpret_cast<quint16*>(screen->base());
    const quint16 c = qt_convertToRgb<quint32>(color.rgba());

    const int stride = screen->linestep();
    const QVector<QRect> rects = region.rects();

    for (int i = 0; i < rects.size(); ++i) {
        const QRect r = rects.at(i);
        qt_rectfill(dest, c, r.x(), r.y(), r.width(), r.height(), stride);
    }
}
#endif // QT_QWS_DEPTH_GENERIC

#ifdef QT_QWS_DEPTH_4
static inline void qt_rectfill_gray4(quint8 *dest, quint8 value,
                                     int x, int y, int width, int height,
                                     int stride)
{
    const int pixelsPerByte = 2;
    dest += y * stride + x / pixelsPerByte;
    const int doAlign = x & 1;
    const int doTail = (width - doAlign) & 1;
    const int width8 = (width - doAlign) / pixelsPerByte;

    for (int j = 0; j < height; ++j) {
        if (doAlign)
            *dest = (*dest & 0xf0) | (value & 0x0f);
        if (width8)
            qt_memfill<quint8>(dest + doAlign, value, width8);
        if (doTail) {
            quint8 *d = dest + doAlign + width8;
            *d = (*d & 0x0f) | (value & 0xf0);
        }
        dest += stride;
    }
}

static void solidFill_gray4(QScreen *screen, const QColor &color,
                            const QRegion &region)
{
    quint8 *dest = reinterpret_cast<quint8*>(screen->base());
    const quint8 c = qGray(color.rgba()) >> 4;
    const quint8 c8 = (c << 4) | c;

    const int stride = screen->linestep();
    const QVector<QRect> rects = region.rects();

    for (int i = 0; i < rects.size(); ++i) {
        const QRect r = rects.at(i);
        qt_rectfill_gray4(dest, c8, r.x(), r.y(), r.width(), r.height(),
                          stride);
    }
}
#endif // QT_QWS_DEPTH_4

#ifdef QT_QWS_DEPTH_1
static inline void qt_rectfill_mono(quint8 *dest, quint8 value,
                                    int x, int y, int width, int height,
                                    int stride)
{
    const int pixelsPerByte = 8;
    const int alignWidth = qMin(width, (8 - (x & 7)) & 7);
    const int doAlign = (alignWidth > 0 ? 1 : 0);
    const int alignStart = pixelsPerByte - 1 - (x & 7);
    const int alignStop = alignStart - (alignWidth - 1);
    const quint8 alignMask = ((1 << alignWidth) - 1) << alignStop;
    const int tailWidth = (width - alignWidth) & 7;
    const int doTail = (tailWidth > 0 ? 1 : 0);
    const quint8 tailMask = (1 << (pixelsPerByte - tailWidth)) - 1;
    const int width8 = (width - alignWidth) / pixelsPerByte;

    dest += y * stride + x / pixelsPerByte;
    stride -= (doAlign + width8);

    for (int j = 0; j < height; ++j) {
        if (doAlign) {
            *dest = (*dest & ~alignMask) | (value & alignMask);
            ++dest;
        }
        if (width8) {
            qt_memfill<quint8>(dest, value, width8);
            dest += width8;
        }
        if (doTail)
            *dest = (*dest & tailMask) | (value & ~tailMask);
        dest += stride;
    }
}

static void solidFill_mono(QScreen *screen, const QColor &color,
                           const QRegion &region)
{
    quint8 *dest = reinterpret_cast<quint8*>(screen->base());
    const quint8 c8 = (qGray(color.rgba()) >> 7) * 0xff;

    const int stride = screen->linestep();
    const QVector<QRect> rects = region.rects();

    for (int i = 0; i < rects.size(); ++i) {
        const QRect r = rects.at(i);
        qt_rectfill_mono(dest, c8, r.x(), r.y(), r.width(), r.height(),
                         stride);
    }
}
#endif // QT_QWS_DEPTH_1

void qt_solidFill_setup(QScreen *screen, const QColor &color,
                        const QRegion &region)
{
    switch (screen->depth()) {
#ifdef QT_QWS_DEPTH_32
    case 32:
        if (screen->pixelType() == QScreen::NormalPixel)
            screen->d_ptr->solidFill = solidFill_template<quint32>;
        else
            screen->d_ptr->solidFill = solidFill_template<qabgr8888>;
        break;
#endif
#ifdef QT_QWS_DEPTH_24
    case 24:
        if (screen->pixelType() == QScreen::NormalPixel)
            screen->d_ptr->solidFill = solidFill_template<qrgb888>;
        else
            screen->d_ptr->solidFill = solidFill_template<quint24>;
        break;
#endif
#ifdef QT_QWS_DEPTH_18
    case 18:
        screen->d_ptr->solidFill = solidFill_template<quint18>;
        break;
#endif
#ifdef QT_QWS_DEPTH_16
    case 16:
        if (screen->pixelType() == QScreen::NormalPixel)
            screen->d_ptr->solidFill = solidFill_template<quint16>;
        else
            screen->d_ptr->solidFill = solidFill_template<qbgr565>;
        break;
#endif
#ifdef QT_QWS_DEPTH_15
    case 15:
        if (screen->pixelType() == QScreen::NormalPixel)
            screen->d_ptr->solidFill = solidFill_template<qrgb555>;
        else
            screen->d_ptr->solidFill = solidFill_template<qbgr555>;
        break;
#endif
#ifdef QT_QWS_DEPTH_12
    case 12:
        screen->d_ptr->solidFill = solidFill_template<qrgb444>;
        break;
#endif
#ifdef QT_QWS_DEPTH_8
    case 8:
        screen->d_ptr->solidFill = solidFill_template<quint8>;
        break;
#endif
#ifdef QT_QWS_DEPTH_4
    case 4:
        screen->d_ptr->solidFill = solidFill_gray4;
        break;
#endif
#ifdef QT_QWS_DEPTH_1
    case 1:
        screen->d_ptr->solidFill = solidFill_mono;
        break;
#endif
     default:
        qFatal("solidFill_setup(): Screen depth %d not supported!",
               screen->depth());
        screen->d_ptr->solidFill = 0;
        break;
    }
    screen->d_ptr->solidFill(screen, color, region);
}

template <typename DST, typename SRC>
static void blit_template(QScreen *screen, const QImage &image,
                          const QPoint &topLeft, const QRegion &region)
{
    DST *dest = reinterpret_cast<DST*>(screen->base());
    const int screenStride = screen->linestep();
    const int imageStride = image.bytesPerLine();

    if (region.rectCount() == 1) {
        const QRect r = region.boundingRect();
        const SRC *src = reinterpret_cast<const SRC*>(image.scanLine(r.y()))
                         + r.x();
        qt_rectconvert<DST, SRC>(dest, src,
                                 r.x() + topLeft.x(), r.y() + topLeft.y(),
                                 r.width(), r.height(),
                                 screenStride, imageStride);
    } else {
        const QVector<QRect> rects = region.rects();

        for (int i = 0; i < rects.size(); ++i) {
            const QRect r = rects.at(i);
            const SRC *src = reinterpret_cast<const SRC*>(image.scanLine(r.y()))
                             + r.x();
            qt_rectconvert<DST, SRC>(dest, src,
                                     r.x() + topLeft.x(), r.y() + topLeft.y(),
                                     r.width(), r.height(),
                                     screenStride, imageStride);
        }
    }
}

#ifdef QT_QWS_DEPTH_32
static void blit_32(QScreen *screen, const QImage &image,
                    const QPoint &topLeft, const QRegion &region)
{
    switch (image.format()) {
    case QImage::Format_RGB32:
    case QImage::Format_ARGB32:
    case QImage::Format_ARGB32_Premultiplied:
        blit_template<quint32, quint32>(screen, image, topLeft, region);
        return;
#ifdef QT_QWS_DEPTH_16
    case QImage::Format_RGB16:
        blit_template<quint32, quint16>(screen, image, topLeft, region);
        return;
#endif
    default:
        qCritical("blit_32(): Image format %d not supported!", image.format());
    }
}
#endif // QT_QWS_DEPTH_32

#ifdef QT_QWS_DEPTH_24
static void blit_24(QScreen *screen, const QImage &image,
                    const QPoint &topLeft, const QRegion &region)
{
    switch (image.format()) {
    case QImage::Format_RGB32:
    case QImage::Format_ARGB32:
    case QImage::Format_ARGB32_Premultiplied:
        blit_template<quint24, quint32>(screen, image, topLeft, region);
        return;
    case QImage::Format_RGB888:
        blit_template<quint24, qrgb888>(screen, image, topLeft, region);
        return;
#ifdef QT_QWS_DEPTH_16
    case QImage::Format_RGB16:
        blit_template<quint24, quint16>(screen, image, topLeft, region);
        return;
#endif
    default:
        qCritical("blit_24(): Image format %d not supported!", image.format());
    }
}

static void blit_qrgb888(QScreen *screen, const QImage &image,
                         const QPoint &topLeft, const QRegion &region)
{
    switch (image.format()) {
    case QImage::Format_RGB32:
    case QImage::Format_ARGB32:
    case QImage::Format_ARGB32_Premultiplied:
        blit_template<qrgb888, quint32>(screen, image, topLeft, region);
        return;
    case QImage::Format_RGB888:
        blit_template<qrgb888, qrgb888>(screen, image, topLeft, region);
        return;
#ifdef QT_QWS_DEPTH_16
    case QImage::Format_RGB16:
        blit_template<qrgb888, quint16>(screen, image, topLeft, region);
        return;
#endif
    default:
        qCritical("blit_24(): Image format %d not supported!", image.format());
        break;
    }
}
#endif // QT_QWS_DEPTH_24

#ifdef QT_QWS_DEPTH_18
static void blit_18(QScreen *screen, const QImage &image,
                    const QPoint &topLeft, const QRegion &region)
{
    switch (image.format()) {
    case QImage::Format_RGB32:
    case QImage::Format_ARGB32:
    case QImage::Format_ARGB32_Premultiplied:
        blit_template<qrgb666, quint32>(screen, image, topLeft, region);
        return;
    case QImage::Format_RGB666:
        blit_template<qrgb666, qrgb666>(screen, image, topLeft, region);
        return;
#ifdef QT_QWS_DEPTH_16
    case QImage::Format_RGB16:
        blit_template<qrgb666, quint16>(screen, image, topLeft, region);
        return;
#endif
    default:
        qCritical("blit_18(): Image format %d not supported!", image.format());
    }
}
#endif // QT_QWS_DEPTH_18

#if (Q_BYTE_ORDER == Q_BIG_ENDIAN) && (defined(QT_QWS_DEPTH_16) || defined(QT_QWS_DEPTH_15))
class quint16LE
{
public:
    inline quint16LE(quint32 v) {
        data = ((v & 0xff00) >> 8) | ((v & 0x00ff) << 8);
    }

    inline quint16LE(int v) {
        data = ((v & 0xff00) >> 8) | ((v & 0x00ff) << 8);
    }

    inline quint16LE(quint16 v) {
        data = ((v & 0xff00) >> 8) | ((v & 0x00ff) << 8);
    }

    inline quint16LE(qrgb555 v) {
        data = (( (quint16)v & 0xff00) >> 8) |
               (( (quint16)v & 0x00ff) << 8);
    }

    inline bool operator==(const quint16LE &v) const
    {
        return data == v.data;
    }

private:
    quint16 data;
};
#endif

#ifdef QT_QWS_DEPTH_16
static void blit_16(QScreen *screen, const QImage &image,
                    const QPoint &topLeft, const QRegion &region)
{
    switch (image.format()) {
    case QImage::Format_RGB32:
    case QImage::Format_ARGB32:
    case QImage::Format_ARGB32_Premultiplied:
        // ### This probably doesn't work but it's a case which should never happen
        blit_template<quint16, quint32>(screen, image, topLeft, region);
        return;
    case QImage::Format_RGB16:
        blit_template<quint16, quint16>(screen, image, topLeft, region);
        return;
    default:
        qCritical("blit_16(): Image format %d not supported!", image.format());
    }
}

#if Q_BYTE_ORDER == Q_BIG_ENDIAN
static void blit_16_bigToLittleEndian(QScreen *screen, const QImage &image,
                                      const QPoint &topLeft,
                                      const QRegion &region)
{
    switch (image.format()) {
    case QImage::Format_RGB32:
    case QImage::Format_ARGB32:
    case QImage::Format_ARGB32_Premultiplied:
        blit_template<quint16LE, quint32>(screen, image, topLeft, region);
        return;
    case QImage::Format_RGB16:
        blit_template<quint16LE, quint16>(screen, image, topLeft, region);
        return;
    default:
        qCritical("blit_16_bigToLittleEndian(): Image format %d not supported!", image.format());
    }
}

#endif // Q_BIG_ENDIAN
#endif // QT_QWS_DEPTH_16

#ifdef QT_QWS_DEPTH_15
static void blit_15(QScreen *screen, const QImage &image,
                    const QPoint &topLeft, const QRegion &region)
{
    switch (image.format()) {
    case QImage::Format_RGB32:
    case QImage::Format_ARGB32:
    case QImage::Format_ARGB32_Premultiplied:
        blit_template<qrgb555, quint32>(screen, image, topLeft, region);
        return;
    case QImage::Format_RGB555:
        blit_template<qrgb555, qrgb555>(screen, image, topLeft, region);
        return;
    case QImage::Format_RGB16:
        blit_template<qrgb555, quint16>(screen, image, topLeft, region);
        return;
    default:
        qCritical("blit_15(): Image format %d not supported!", image.format());
    }
}

#if Q_BYTE_ORDER == Q_BIG_ENDIAN
static void blit_15_bigToLittleEndian(QScreen *screen, const QImage &image,
                                      const QPoint &topLeft,
                                      const QRegion &region)
{
    switch (image.format()) {
    case QImage::Format_RGB555:
        blit_template<quint16LE, qrgb555>(screen, image, topLeft, region);
        return;
    default:
        qCritical("blit_15_bigToLittleEndian(): Image format %d not supported!", image.format());
    }
}
#endif // Q_BIG_ENDIAN
#endif // QT_QWS_DEPTH_15


#ifdef QT_QWS_DEPTH_12
static void blit_12(QScreen *screen, const QImage &image,
                    const QPoint &topLeft, const QRegion &region)
{
    switch (image.format()) {
    case QImage::Format_ARGB4444_Premultiplied:
        blit_template<qrgb444, qargb4444>(screen, image, topLeft, region);
        return;
    case QImage::Format_RGB444:
        blit_template<qrgb444, qrgb444>(screen, image, topLeft, region);
        return;
    default:
        qCritical("blit_12(): Image format %d not supported!", image.format());
    }
}
#endif // QT_QWS_DEPTH_12

#ifdef QT_QWS_DEPTH_8
static void blit_8(QScreen *screen, const QImage &image,
                   const QPoint &topLeft, const QRegion &region)
{
    switch (image.format()) {
    case QImage::Format_RGB32:
    case QImage::Format_ARGB32:
    case QImage::Format_ARGB32_Premultiplied:
        blit_template<quint8, quint32>(screen, image, topLeft, region);
        return;
    case QImage::Format_RGB16:
        blit_template<quint8, quint16>(screen, image, topLeft, region);
        return;
    case QImage::Format_ARGB4444_Premultiplied:
        blit_template<quint8, qargb4444>(screen, image, topLeft, region);
        return;
    case QImage::Format_RGB444:
        blit_template<quint8, qrgb444>(screen, image, topLeft, region);
        return;
    default:
        qCritical("blit_8(): Image format %d not supported!", image.format());
    }
}
#endif // QT_QWS_DEPTH_8

#ifdef QT_QWS_DEPTH_4

struct qgray4 { quint8 dummy; } Q_PACKED;

template <typename SRC>
Q_STATIC_TEMPLATE_FUNCTION inline quint8 qt_convertToGray4(SRC color);

template <>
inline quint8 qt_convertToGray4(quint32 color)
{
    return qGray(color) >> 4;
}

template <>
inline quint8 qt_convertToGray4(quint16 color)
{
    const int r = (color & 0xf800) >> 11;
    const int g = (color & 0x07e0) >> 6; // only keep 5 bit
    const int b = (color & 0x001f);
    return (r * 11 + g * 16 + b * 5) >> 6;
}

template <>
inline quint8 qt_convertToGray4(qrgb444 color)
{
    return qt_convertToGray4(quint32(color));
}

template <>
inline quint8 qt_convertToGray4(qargb4444 color)
{
    return qt_convertToGray4(quint32(color));
}

template <typename SRC>
Q_STATIC_TEMPLATE_FUNCTION inline void qt_rectconvert_gray4(qgray4 *dest4, const SRC *src,
                                        int x, int y, int width, int height,
                                        int dstStride, int srcStride)
{
    const int pixelsPerByte = 2;
    quint8 *dest8 = reinterpret_cast<quint8*>(dest4)
                    + y * dstStride + x / pixelsPerByte;
    const int doAlign = x & 1;
    const int doTail = (width - doAlign) & 1;
    const int width8 = (width - doAlign) / pixelsPerByte;
    const int count8 = (width8 + 3) / 4;

    srcStride = srcStride / sizeof(SRC) - width;
    dstStride -= (width8 + doAlign);

    for (int i = 0; i < height; ++i) {
        if (doAlign) {
            *dest8 = (*dest8 & 0xf0) | qt_convertToGray4<SRC>(*src++);
            ++dest8;
        }
        if (count8) {
            int n = count8;
            switch (width8 & 0x03) // duff's device
            {
            case 0: do { *dest8++ = qt_convertToGray4<SRC>(src[0]) << 4
                                    | qt_convertToGray4<SRC>(src[1]);
                         src += 2;
            case 3:      *dest8++ = qt_convertToGray4<SRC>(src[0]) << 4
                                    | qt_convertToGray4<SRC>(src[1]);
                         src += 2;
            case 2:      *dest8++ = qt_convertToGray4<SRC>(src[0]) << 4
                                    | qt_convertToGray4<SRC>(src[1]);
                         src += 2;
            case 1:      *dest8++ = qt_convertToGray4<SRC>(src[0]) << 4
                                    | qt_convertToGray4<SRC>(src[1]);
                         src += 2;
            } while (--n > 0);
            }
        }

        if (doTail)
            *dest8 = qt_convertToGray4<SRC>(*src++) << 4 | (*dest8 & 0x0f);

        dest8 += dstStride;
        src += srcStride;
    }
}

template <>
void qt_rectconvert(qgray4 *dest, const quint32 *src,
                    int x, int y, int width, int height,
                    int dstStride, int srcStride)
{
    qt_rectconvert_gray4<quint32>(dest, src, x, y, width, height,
                                  dstStride, srcStride);
}

template <>
void qt_rectconvert(qgray4 *dest, const quint16 *src,
                    int x, int y, int width, int height,
                    int dstStride, int srcStride)
{
    qt_rectconvert_gray4<quint16>(dest, src, x, y, width, height,
                                  dstStride, srcStride);
}

template <>
void qt_rectconvert(qgray4 *dest, const qrgb444 *src,
                    int x, int y, int width, int height,
                    int dstStride, int srcStride)
{
    qt_rectconvert_gray4<qrgb444>(dest, src, x, y, width, height,
                                  dstStride, srcStride);
}

template <>
void qt_rectconvert(qgray4 *dest, const qargb4444 *src,
                    int x, int y, int width, int height,
                    int dstStride, int srcStride)
{
    qt_rectconvert_gray4<qargb4444>(dest, src, x, y, width, height,
                                    dstStride, srcStride);
}

static void blit_4(QScreen *screen, const QImage &image,
                   const QPoint &topLeft, const QRegion &region)
{
    switch (image.format()) {
    case QImage::Format_ARGB32_Premultiplied:
        blit_template<qgray4, quint32>(screen, image, topLeft, region);
        return;
    case QImage::Format_RGB16:
        blit_template<qgray4, quint16>(screen, image, topLeft, region);
        return;
    case QImage::Format_RGB444:
        blit_template<qgray4, qrgb444>(screen, image, topLeft, region);
        return;
    case QImage::Format_ARGB4444_Premultiplied:
        blit_template<qgray4, qargb4444>(screen, image, topLeft, region);
        return;
    default:
        qCritical("blit_4(): Image format %d not supported!", image.format());
    }
}
#endif // QT_QWS_DEPTH_4

#ifdef QT_QWS_DEPTH_1

struct qmono { quint8 dummy; } Q_PACKED;

template <typename SRC>
Q_STATIC_TEMPLATE_FUNCTION inline quint8 qt_convertToMono(SRC color);

template <>
inline quint8 qt_convertToMono(quint32 color)
{
    return qGray(color) >> 7;
}

template <>
inline quint8 qt_convertToMono(quint16 color)
{
    return (qGray(qt_colorConvert<quint32, quint16>(color, 0)) >> 7);
}

template <>
inline quint8 qt_convertToMono(qargb4444 color)
{
    return (qGray(quint32(color)) >> 7);
}

template <>
inline quint8 qt_convertToMono(qrgb444 color)
{
    return (qGray(quint32(color)) >> 7);
}

template <typename SRC>
inline void qt_rectconvert_mono(qmono *dest, const SRC *src,
                                       int x, int y, int width, int height,
                                       int dstStride, int srcStride)
{
    const int pixelsPerByte = 8;
    quint8 *dest8 = reinterpret_cast<quint8*>(dest)
                    + y * dstStride + x / pixelsPerByte;
    const int alignWidth = qMin(width, (8 - (x & 7)) & 7);
    const int doAlign = (alignWidth > 0 ? 1 : 0);
    const int alignStart = pixelsPerByte - 1 - (x & 7);
    const int alignStop = alignStart - (alignWidth - 1);
    const quint8 alignMask = ((1 << alignWidth) - 1) << alignStop;
    const int tailWidth = (width - alignWidth) & 7;
    const int doTail = (tailWidth > 0 ? 1 : 0);
    const quint8 tailMask = (1 << (pixelsPerByte - tailWidth)) - 1;
    const int width8 = (width - alignWidth) / pixelsPerByte;

    srcStride = srcStride / sizeof(SRC) - (width8 * 8 + alignWidth);
    dstStride -= (width8 + doAlign);

    for (int j = 0;  j < height; ++j) {
        if (doAlign) {
            quint8 d = *dest8 & ~alignMask;
            for (int i = alignStart; i >= alignStop; --i)
                d |= qt_convertToMono<SRC>(*src++) << i;
            *dest8++ = d;
        }
        for (int i = 0; i < width8; ++i) {
            *dest8 = (qt_convertToMono<SRC>(src[0]) << 7)
                     | (qt_convertToMono<SRC>(src[1]) << 6)
                     | (qt_convertToMono<SRC>(src[2]) << 5)
                     | (qt_convertToMono<SRC>(src[3]) << 4)
                     | (qt_convertToMono<SRC>(src[4]) << 3)
                     | (qt_convertToMono<SRC>(src[5]) << 2)
                     | (qt_convertToMono<SRC>(src[6]) << 1)
                     | (qt_convertToMono<SRC>(src[7]));
            src += 8;
            ++dest8;
        }
        if (doTail) {
            quint8 d = *dest8 & tailMask;
            switch (tailWidth) {
            case 7: d |= qt_convertToMono<SRC>(src[6]) << 1;
            case 6: d |= qt_convertToMono<SRC>(src[5]) << 2;
            case 5: d |= qt_convertToMono<SRC>(src[4]) << 3;
            case 4: d |= qt_convertToMono<SRC>(src[3]) << 4;
            case 3: d |= qt_convertToMono<SRC>(src[2]) << 5;
            case 2: d |= qt_convertToMono<SRC>(src[1]) << 6;
            case 1: d |= qt_convertToMono<SRC>(src[0]) << 7;
            }
            *dest8 = d;
        }

        dest8 += dstStride;
        src += srcStride;
    }
}

template <>
void qt_rectconvert(qmono *dest, const quint32 *src,
                    int x, int y, int width, int height,
                    int dstStride, int srcStride)
{
    qt_rectconvert_mono<quint32>(dest, src, x, y, width, height,
                                 dstStride, srcStride);
}

template <>
void qt_rectconvert(qmono *dest, const quint16 *src,
                    int x, int y, int width, int height,
                    int dstStride, int srcStride)
{
    qt_rectconvert_mono<quint16>(dest, src, x, y, width, height,
                                 dstStride, srcStride);
}

template <>
void qt_rectconvert(qmono *dest, const qrgb444 *src,
                    int x, int y, int width, int height,
                    int dstStride, int srcStride)
{
    qt_rectconvert_mono<qrgb444>(dest, src, x, y, width, height,
                                 dstStride, srcStride);
}

template <>
void qt_rectconvert(qmono *dest, const qargb4444 *src,
                    int x, int y, int width, int height,
                    int dstStride, int srcStride)
{
    qt_rectconvert_mono<qargb4444>(dest, src, x, y, width, height,
                                   dstStride, srcStride);
}

static void blit_1(QScreen *screen, const QImage &image,
                   const QPoint &topLeft, const QRegion &region)
{
    switch (image.format()) {
    case QImage::Format_ARGB32_Premultiplied:
        blit_template<qmono, quint32>(screen, image, topLeft, region);
        return;
    case QImage::Format_RGB16:
        blit_template<qmono, quint16>(screen, image, topLeft, region);
        return;
    case QImage::Format_RGB444:
        blit_template<qmono, qrgb444>(screen, image, topLeft, region);
        return;
    case QImage::Format_ARGB4444_Premultiplied:
        blit_template<qmono, qargb4444>(screen, image, topLeft, region);
        return;
    default:
        qCritical("blit_1(): Image format %d not supported!", image.format());
    }
}
#endif // QT_QWS_DEPTH_1

#ifdef QT_QWS_DEPTH_GENERIC

static void blit_rgb(QScreen *screen, const QImage &image,
                     const QPoint &topLeft, const QRegion &region)
{
    switch (image.format()) {
    case QImage::Format_ARGB32_Premultiplied:
        blit_template<qrgb, quint32>(screen, image, topLeft, region);
        return;
    case QImage::Format_RGB16:
        blit_template<qrgb, quint16>(screen, image, topLeft, region);
        return;
    default:
        qCritical("blit_rgb(): Image format %d not supported!", image.format());
    }
}

void qt_set_generic_blit(QScreen *screen, int bpp,
                         int len_red, int len_green, int len_blue, int len_alpha,
                         int off_red, int off_green, int off_blue, int off_alpha)
{
    qrgb::bpp = bpp / 8;
    qrgb::len_red = len_red;
    qrgb::len_green = len_green;
    qrgb::len_blue = len_blue;
    qrgb::len_alpha = len_alpha;
    qrgb::off_red = off_red;
    qrgb::off_green = off_green;
    qrgb::off_blue = off_blue;
    qrgb::off_alpha = off_alpha;
    screen->d_ptr->blit = blit_rgb;
    if (bpp == 16)
        screen->d_ptr->solidFill = solidFill_rgb_16bpp;
    else if (bpp == 32)
        screen->d_ptr->solidFill = solidFill_rgb_32bpp;
}

#endif // QT_QWS_DEPTH_GENERIC

void qt_blit_setup(QScreen *screen, const QImage &image,
                   const QPoint &topLeft, const QRegion &region)
{
    switch (screen->depth()) {
#ifdef QT_QWS_DEPTH_32
    case 32:
        if (screen->pixelType() == QScreen::NormalPixel)
            screen->d_ptr->blit = blit_32;
        else
            screen->d_ptr->blit = blit_template<qabgr8888, quint32>;
        break;
#endif
#ifdef QT_QWS_DEPTH_24
    case 24:
        if (screen->pixelType() == QScreen::NormalPixel)
            screen->d_ptr->blit = blit_qrgb888;
        else
            screen->d_ptr->blit = blit_24;
        break;
#endif
#ifdef QT_QWS_DEPTH_18
    case 18:
        screen->d_ptr->blit = blit_18;