qscreen_qws.cpp

奇趣公司比较新的qt/emd版本

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#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 "qwsdisplay_qws.h"
#include <private/qdrawhelper_p.h>
#include <private/qpaintengine_raster_p.h>
#include <private/qpainter_p.h>
#include <private/qwindowsurface_qws_p.h>
#include <private/qwidget_p.h>

// #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 Qtopia Core.

    Note that this class is non-portable, and that it is only
    available in \l {Qtopia Core}.

    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);
    cursor = image;
    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)
{
    const QRegion r = boundingRect();
    pos = QPoint(x,y);
    if (enable && !hwaccel)
        qt_screen->exposeRegion(r | boundingRect(), 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);

    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;
    QImage::Format pixelFormat;
#if Q_BYTE_ORDER == Q_BIG_ENDIAN
    bool fb_is_littleEndian;
#endif
    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);