/****************************************************************************
** $Id: qt/qdirectpainter_qws.cpp   3.1.1   edited Nov 7 16:55 $
**
** Implementation of QDirectPainter class
**
** Created : 010101
**
** Copyright (C) 2000 Trolltech AS.  All rights reserved.
**
** This file is part of the kernel module of the Qt GUI Toolkit.
**
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** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file.
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**********************************************************************/

#include "qdirectpainter_qws.h"

#ifdef Q_WS_QWS
#ifndef QT_NO_DIRECTPAINTER
#include <qgfxraster_qws.h>

// gain access to some internal QGfx functionality you'll need.
class QDirectPainterGfx : public QGfxRasterBase {
    void* gfxdata;
public:
    QDirectPainterGfx() : QGfxRasterBase(0,0,0) { }

    void beginTransaction(const QRect& r) { gfxdata=QGfxRasterBase::beginTransaction(r); }
    void endTransaction() { QGfxRasterBase::endTransaction(gfxdata); }
    unsigned char * memory() { return buffer; }
    int numRects() const { return ncliprect; }
    const QRect& rect(int i) const { return cliprect[i]; }
};


class QDirectPainter::Private {
public:
    Private()
    {
	paintOk = TRUE;
	image = 0;
	gfx = 0;
    }

    QDirectPainterGfx* gfx;
    bool paintOk;
    QImage* image;
    QPoint offset;
    int w,h;
    QRect change;
    QRegion rgn;
};

/*!
    \class QDirectPainter qdirectpainter_qws.h
    \brief The QDirectPainter class provides direct access to the video hardware.

    \ingroup graphics

    Only available in Qt/Embedded.

    When the hardware is known and well defined, as is often the case
    with software for embedded devices, it may be useful to manipulate
    the underlying video hardware directly. In order to do this in a
    way that is co-operative with other applications, you must lock
    the video hardware for exclusive use for a small time while you
    write to it, and you must know the clipping region which is
    allocated to a widget.

    QDirectPainter provides this functionality.

    In the simplest case, you make a QDirectPainter on a widget and
    then, observing the clip region, perform some platform-specific
    operation. For example:
    \code
	void MyWidget::updatePlatformGraphics()
	{
	    QDirectPainter dp( this );
	    for ( int i = 0; i < dp.numRects; i++ ) {
		const QRect& clip = dp.rect(i);
		... // platform specific operation
	    }
	}
    \endcode

    The platform-specific code has access to the display, but should
    only modify graphics in the rectangles specified by numRects() and
    rect(). Note that these rectangles are relative to the entire
    display.

    The offset() function returns the position of the widget relative
    to the entire display, allowing you to offset platform-specific
    operations appropriately. The xOffset() and yOffset() functions
    merely return the component values of offset().

    For simple frame-buffer hardware, the frameBuffer(), lineStep(),
    and depth() functions provide basic access, though some hardware
    configurations are insufficiently specified by such simple
    parameters.

    Note that while a QDirectPainter exists, the entire Qt/Embedded
    window system is locked from use by other applications. Always
    construct the QDirectPainter as an auto (stack) variable, and be
    very careful to write robust and stable code within its scope.
*/

/*!
    Construct a direct painter on \a w. The display is locked and the
    mouse cursor is hidden if it is above \a w.
*/
QDirectPainter::QDirectPainter( const QWidget* w ) :
    QPainter(w,w)
{
    d = new Private;
    d->gfx = (QDirectPainterGfx*)internalGfx();
    d->offset = w->mapToGlobal(QPoint(0,0));
    d->w = w->width();
    d->h = w->height();
    d->gfx->beginTransaction(QRect(d->offset,size()));
    d->change = QRect(d->offset, QSize(d->w,d->h));
}

/*!
    Destroys the direct painter. The mouse cursor is revealed if
    necessary and the display is unlocked.
*/
QDirectPainter::~QDirectPainter()
{
    d->gfx->endTransaction();
    qt_screen->setDirty(d->change);
    delete d;
}


/*!
    Returns a pointer to the framebuffer memory if available.
*/
uchar* QDirectPainter::frameBuffer() { return d->gfx->memory(); }

/*!
    Returns the spacing in bytes from one framebuffer line to the
    next.
*/
int QDirectPainter::lineStep() { return d->gfx->linestep(); }

/*!
    Returns a number that signifies the orientation of the
    framebuffer.
    \table
    \row \i11 0 \i11 no rotation
    \row \i11 1 \i11 90 degrees rotation
    \row \i11 2 \i11 180 degrees rotation
    \row \i11 3 \i11 270 degrees rotation
    \endtable
*/
int QDirectPainter::transformOrientation()
{
    return qt_screen->transformOrientation();
}

/*!
    Returns the number of rectangles in the drawable region.

    \sa rect(), region()
*/
int QDirectPainter::numRects() const { return d->gfx->numRects(); }

/*!
    Returns a reference to rectangle \a i of the drawable region.
    Valid values for \a i are 0..numRects()-1.

    \sa region()
*/
const QRect& QDirectPainter::rect(int i) const { return d->gfx->rect(i); }

/*!
    Returns the region of the framebuffer which represents the exposed
    area of the widget being painted on. Note that this may be a sub-area of
    the clip region, because of child widgets and overlapping cousin widgets.

    \sa numRects(), rect()
*/
QRegion QDirectPainter::region() const
{
    if ( d->rgn.isNull() ) {
	QRegion r;
	r.setRects( &d->gfx->rect(0), numRects() );
	d->rgn = r;
    }
    return d->rgn;
}

/*!
    Returns the bit-depth of the display.
*/
int QDirectPainter::depth() const { return d->gfx->bitDepth(); }

/*!
    Returns the width of the widget drawn upon.
*/
int QDirectPainter::width() const { return d->w; }

/*!
    Returns the height of the widget drawn upon.
*/
int QDirectPainter::height() const { return d->h; }

/*!
    Returns the X-position of the widget relative to the entire
    display.
*/
int QDirectPainter::xOffset() const { return d->offset.x(); }

/*!
    Returns the Y-position of the widget relative to the entire
    display.
*/
int QDirectPainter::yOffset() const { return d->offset.y(); }

/*!
    Returns the position of the widget relative to the entire display.
*/
QPoint QDirectPainter::offset() const { return d->offset; }

/*!
    Returns the size of the widget drawn upon.

    \sa width(), height()
*/
QSize QDirectPainter::size() const { return QSize(d->w,d->h); }

/*!
    Sets the area changed by the transaction to \a r. By default, the
    entire widget is assumed to have changed. The area changed is only
    used by some graphics drivers, so often calling this function for
    a smaller area will make no difference to performance.
*/
void QDirectPainter::setAreaChanged( const QRect& r )
{
    d->change = r;
}
#endif //QT_NO_DIRECTPAINTER
#endif
