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/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the plugins of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** No Commercial Usage
** This file contains pre-release code and may not be distributed.
** You may use this file in accordance with the terms and conditions
** contained in the either Technology Preview License Agreement or the
** Beta Release License Agreement.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain
** additional rights. These rights are described in the Nokia Qt LGPL
** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this
** package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3.0 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 the GNU General Public License version 3.0 requirements will be
** met: http://www.gnu.org/copyleft/gpl.html.
**
** If you are unsure which license is appropriate for your use, please
** contact the sales department at http://www.qtsoftware.com/contact.
** $QT_END_LICENSE$
**
****************************************************************************/
#include "qsvgiohandler.h"
#ifndef QT_NO_SVGRENDERER
#include "qsvgrenderer.h"
#include "qimage.h"
#include "qpixmap.h"
#include "qpainter.h"
#include "qvariant.h"
#include "qdebug.h"
QT_BEGIN_NAMESPACE
class QSvgIOHandlerPrivate
{
public:
QSvgIOHandlerPrivate()
: r(new QSvgRenderer()), loaded(false)
{}
~QSvgIOHandlerPrivate()
{
delete r;
}
bool load(QIODevice *device);
static bool findSvgTag(QIODevice *device);
QSvgRenderer *r;
QSize defaultSize;
QSize currentSize;
bool loaded;
};
bool QSvgIOHandlerPrivate::load(QIODevice *device)
{
if (loaded)
return true;
if (r->load(device->readAll())) {
defaultSize = QSize(r->viewBox().width(), r->viewBox().height());
if (currentSize.isEmpty())
currentSize = defaultSize;
}
loaded = r->isValid();
return loaded;
}
bool QSvgIOHandlerPrivate::findSvgTag(QIODevice *device)
{
qint64 pos = device->pos();
device->seek(0);
char buffer[256];
const char svg_tag[] = "<svg";
while (1) {
int size = device->read(buffer, 256);
for (int i=0; i<size - 5; ++i) {
if (!memcmp(buffer + i, svg_tag, 4)) {
if (buffer[i+4] == ' ' || buffer[i+4] == '\t'
|| buffer[i+4] == '\n' || buffer[i+4] == '\r')
{
device->seek(pos);
return true;
}
}
}
if (device->atEnd())
break;
device->seek(device->pos()-4);
}
device->seek(pos);
return false;
}
QSvgIOHandler::QSvgIOHandler()
: d(new QSvgIOHandlerPrivate())
{
}
QSvgIOHandler::~QSvgIOHandler()
{
delete d;
}
bool QSvgIOHandler::canRead() const
{
return QSvgIOHandlerPrivate::findSvgTag(device());
}
QByteArray QSvgIOHandler::name() const
{
return "svg";
}
bool QSvgIOHandler::read(QImage *image)
{
if (d->load(device())) {
*image = QImage(d->currentSize, QImage::Format_ARGB32_Premultiplied);
if (!d->currentSize.isEmpty()) {
image->fill(0x00000000);
QPainter p(image);
d->r->render(&p);
p.end();
}
return true;
}
return false;
}
QVariant QSvgIOHandler::option(ImageOption option) const
{
switch(option) {
case ImageFormat:
return QImage::Format_ARGB32_Premultiplied;
break;
case Size:
d->load(device());
return d->defaultSize;
break;
case ScaledSize:
return d->currentSize;
break;
default:
break;
}
return QVariant();
}
void QSvgIOHandler::setOption(ImageOption option, const QVariant & value)
{
switch(option) {
case Size:
d->defaultSize = value.toSize();
d->currentSize = value.toSize();
break;
case ScaledSize:
d->currentSize = value.toSize();
break;
default:
break;
}
}
bool QSvgIOHandler::supportsOption(ImageOption option) const
{
switch(option)
{
case ImageFormat:
case Size:
case ScaledSize:
return true;
default:
break;
}
return false;
}
bool QSvgIOHandler::canRead(QIODevice *device)
{
return QSvgIOHandlerPrivate::findSvgTag(device);
}
QT_END_NAMESPACE
#endif // QT_NO_SVGRENDERER
|
