q3picture.cpp

qt-x11-opensource-src-4.1.4.tar.gz源码

/****************************************************************************
**
** Copyright (C) 1992-2006 Trolltech ASA. All rights reserved.
**
** This file is part of the Qt3Support module of the Qt Toolkit.
**
** This file may be used under the terms of the GNU General Public
** License version 2.0 as published by the Free Software Foundation
** and appearing in the file LICENSE.GPL included in the packaging of
** this file.  Please review the following information to ensure GNU
** General Public Licensing requirements will be met:
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**
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** review the following information:
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** sales department at [e-mail].
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** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
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****************************************************************************/

#include "private/qpicture_p.h"
#include "qfile.h"
#include "qpainter.h"
#include "q3picture.h"
#include "q3paintengine_svg_p.h"

class Q3SvgDevice : public QPaintDevice
{
public:
    Q3SvgDevice() : QPaintDevice() {}
    bool load(QIODevice *dev) { return svgEngine.load(dev); }
    bool save(const QString &fileName) { return svgEngine.save(fileName); }
    bool save(QIODevice *dev) { return svgEngine.save(dev); }
    void setBoundingRect(const QRect &rect) { svgEngine.setBoundingRect(rect); }
    QRect boundingRect() const { return svgEngine.boundingRect(); }
    QPaintEngine *paintEngine() const { return (QPaintEngine *)&svgEngine; }
    bool play(QPainter *p) { return svgEngine.play(p); }
    int metric(PaintDeviceMetric m) const;

private:
    Q3SVGPaintEngine svgEngine;
};

int Q3SvgDevice::metric(PaintDeviceMetric m) const
{
        int val;
        QRect br = svgEngine.boundingRect();
        switch (m) {
        case PdmWidth:
            val = br.width();
            break;
        case PdmHeight:
            val = br.height();
            break;
        case PdmWidthMM:
            val = int(25.4/72.0*br.width());
            break;
        case PdmHeightMM:
            val = int(25.4/72.0*br.height());
            break;
        case PdmDpiX:
            val = 72;
            break;
        case PdmDpiY:
            val = 72;
            break;
        case PdmNumColors:
            val = 16777216;
            break;
        case PdmDepth:
            val = 24;
            break;
        default:
            val = 0;
            qWarning("Q3SvgDevice::metric: Invalid metric command");
        }
        return val;
}

/*!
    \class Q3Picture
    \brief The Q3Picture class is a paint device that records and
    replays Q3Painter commands.

    \compat

    Q3Picture can also read and write SVG (Scalable Vector Graphics)
    files; these files are in an XML format specified by \link
    http://www.w3.org/Graphics/SVG/ W3C\endlink. (See the load() and
    save() functions.)

    \sa QPicture
*/

/*!
    \fn Q3Picture::Q3Picture()

    Constructs a Q3Picture.
*/

/*!
    \fn Q3Picture::Q3Picture(const QPicture &other)

    Constructs a copy of \a other.
*/

/*!
    \overload
    Loads the picture in the specified \a format from a file with the
    given \a fileName. Returns true if the file is loaded successfully;
    otherwise returns false.

    \sa save()
*/
bool Q3Picture::load(const QString &fileName, const char *format)
{
    QFile f(fileName);
    if (!f.open(QIODevice::ReadOnly))
        return false;
    return load(&f, format);
}

/*!
    \fn bool Q3Picture::load(QIODevice *device, const char *format)

    Loads the picture in the specified \a format from the given \a device.
    Returns true if the file is loaded successfully; otherwise returns false.

    \sa save()
*/
bool Q3Picture::load(QIODevice *dev, const char *format)
{
    if (qstrcmp(format, "svg" ) == 0) {
	Q3SvgDevice svg;
	if (!svg.load(dev))
	    return false;
        QPainter p(this);
        p.setRenderHint(QPainter::Antialiasing);
	bool b = svg.play(&p);
	d_func()->brect = svg.boundingRect();
	return b;
    }
    return QPicture::load(dev, format);
}

/*!
    \overload
    Saves the picture in the specified \a format to the file with the
    given \a fileName.

    \sa load()
*/
bool Q3Picture::save(const QString &fileName, const char *format)
{
    if (paintingActive()) {
        qWarning("Q3Picture::save: still being painted on. "
                  "Call QPainter::end() first");
        return false;
    }

    // identical to QIODevice* code below but the file name
    // makes a difference when it comes to saving pixmaps
    if (qstricmp( format, "svg") == 0) {
	Q3SvgDevice svg;
	QPainter p(&svg);
	if (!play(&p))
	    return false;
	svg.setBoundingRect(boundingRect());
	return svg.save(fileName);
    }

    return QPicture::save(fileName, format);
}

/*!
    \fn bool Q3Picture::save(QIODevice *device, const char *format)

    Saves the picture in the specified \a format to the given \a device.

    \sa load()
*/
bool Q3Picture::save(QIODevice *dev, const char *format)
{
    if (paintingActive()) {
        qWarning("Q3Picture::save: still being painted on. "
                  "Call QPainter::end() first");
        return false;
    }

    if (qstricmp(format, "svg") == 0) {
	Q3SvgDevice svg;
	QPainter p(&svg);
	if (!play(&p))
	    return false;
	svg.setBoundingRect(boundingRect());
	return svg.save(dev);
    }

    return QPicture::save(dev, format);
}