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// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
#include "qsvgiohandler.h"
#ifndef QT_NO_SVGRENDERER
#include "qsvgrenderer.h"
#include "qimage.h"
#include "qpixmap.h"
#include "qpainter.h"
#include "qvariant.h"
#include "qbuffer.h"
#include "qdebug.h"
QT_BEGIN_NAMESPACE
class QSvgIOHandlerPrivate
{
public:
QSvgIOHandlerPrivate(QSvgIOHandler *qq)
: q(qq), loaded(false), readDone(false), backColor(Qt::transparent)
{}
bool load(QIODevice *device);
QSvgIOHandler *q;
QSvgRenderer r;
QXmlStreamReader xmlReader;
QSize defaultSize;
QRect clipRect;
QSize scaledSize;
QRect scaledClipRect;
bool loaded;
bool readDone;
QColor backColor;
};
bool QSvgIOHandlerPrivate::load(QIODevice *device)
{
if (loaded)
return true;
if (q->format().isEmpty())
q->canRead();
// # The SVG renderer doesn't handle trailing, unrelated data, so we must
// assume that all available data in the device is to be read.
bool res = false;
QBuffer *buf = qobject_cast<QBuffer *>(device);
if (buf) {
const QByteArray &ba = buf->data();
res = r.load(QByteArray::fromRawData(ba.constData() + buf->pos(), ba.size() - buf->pos()));
buf->seek(ba.size());
#ifndef QT_NO_COMPRESS
} else if (q->format() == "svgz") {
res = r.load(device->readAll());
#endif
} else {
xmlReader.setDevice(device);
res = r.load(&xmlReader);
}
if (res) {
defaultSize = r.defaultSize();
loaded = true;
}
return loaded;
}
QSvgIOHandler::QSvgIOHandler()
: d(new QSvgIOHandlerPrivate(this))
{
}
QSvgIOHandler::~QSvgIOHandler()
{
delete d;
}
static bool isPossiblySvg(QIODevice *device, bool *isCompressed = nullptr)
{
constexpr int bufSize = 64;
char buf[bufSize];
const qint64 readLen = device->peek(buf, bufSize);
if (readLen < 8)
return false;
# ifndef QT_NO_COMPRESS
if (quint8(buf[0]) == 0x1f && quint8(buf[1]) == 0x8b) {
if (isCompressed)
*isCompressed = true;
return true;
}
# endif
QTextStream str(QByteArray::fromRawData(buf, readLen));
QByteArray ba = str.read(16).trimmed().toLatin1();
return ba.startsWith("<?xml") || ba.startsWith("<svg") || ba.startsWith("<!--") || ba.startsWith("<!DOCTYPE svg");
}
bool QSvgIOHandler::canRead() const
{
if (!device())
return false;
if (d->loaded && !d->readDone)
return true; // Will happen if we have been asked for the size
bool isCompressed = false;
if (isPossiblySvg(device(), &isCompressed)) {
setFormat(isCompressed ? "svgz" : "svg");
return true;
}
return false;
}
bool QSvgIOHandler::read(QImage *image)
{
if (!d->readDone && d->load(device())) {
bool xform = (d->clipRect.isValid() || d->scaledSize.isValid() || d->scaledClipRect.isValid());
QSize finalSize = d->defaultSize;
QRectF bounds;
if (xform && !d->defaultSize.isEmpty()) {
bounds = QRectF(QPointF(0,0), QSizeF(d->defaultSize));
QPoint tr1, tr2;
QSizeF sc(1, 1);
if (d->clipRect.isValid()) {
tr1 = -d->clipRect.topLeft();
finalSize = d->clipRect.size();
}
if (d->scaledSize.isValid()) {
sc = QSizeF(qreal(d->scaledSize.width()) / finalSize.width(),
qreal(d->scaledSize.height()) / finalSize.height());
finalSize = d->scaledSize;
}
if (d->scaledClipRect.isValid()) {
tr2 = -d->scaledClipRect.topLeft();
finalSize = d->scaledClipRect.size();
}
QTransform t;
t.translate(tr2.x(), tr2.y());
t.scale(sc.width(), sc.height());
t.translate(tr1.x(), tr1.y());
bounds = t.mapRect(bounds);
}
if (finalSize.isEmpty()) {
*image = QImage();
} else {
if (qMax(finalSize.width(), finalSize.height()) > 0xffff)
return false; // Assume corrupted file
if (!QImageIOHandler::allocateImage(finalSize, QImage::Format_ARGB32_Premultiplied, image))
return false;
image->fill(d->backColor.rgba());
QPainter p(image);
d->r.render(&p, bounds);
p.end();
}
d->readDone = true;
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 ClipRect:
return d->clipRect;
break;
case ScaledSize:
return d->scaledSize;
break;
case ScaledClipRect:
return d->scaledClipRect;
break;
case BackgroundColor:
return d->backColor;
break;
default:
break;
}
return QVariant();
}
void QSvgIOHandler::setOption(ImageOption option, const QVariant & value)
{
switch(option) {
case ClipRect:
d->clipRect = value.toRect();
break;
case ScaledSize:
d->scaledSize = value.toSize();
break;
case ScaledClipRect:
d->scaledClipRect = value.toRect();
break;
case BackgroundColor:
d->backColor = value.value<QColor>();
break;
default:
break;
}
}
bool QSvgIOHandler::supportsOption(ImageOption option) const
{
switch(option)
{
case ImageFormat:
case Size:
case ClipRect:
case ScaledSize:
case ScaledClipRect:
case BackgroundColor:
return true;
default:
break;
}
return false;
}
bool QSvgIOHandler::canRead(QIODevice *device)
{
return isPossiblySvg(device);
}
QT_END_NAMESPACE
#endif // QT_NO_SVGRENDERER
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