plasma-framework/svg.cpp
2007-05-28 20:09:50 +00:00

206 lines
5.2 KiB
C++

/*
* Copyright (C) 2006 Aaron Seigo <aseigo@kde.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Library General Public License version 2 as
* published by the Free Software Foundation
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details
*
* You should have received a copy of the GNU Library General Public
* License along with this program; if not, write to the
* Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#include "svg.h"
#include <QDir>
#include <QMatrix>
#include <QPainter>
#include <QPixmapCache>
#include <KDebug>
#include <KSvgRenderer>
#include "theme.h"
namespace Plasma
{
class Svg::Private
{
public:
Private( const QString& imagePath )
: renderer( 0 )
{
if (QDir::isAbsolutePath(themePath)) {
path = imagePath;
themed = false;
} else {
themePath = imagePath;
themed = true;
}
}
~Private()
{
delete renderer;
}
void removeFromCache()
{
if ( id.isEmpty() ) {
return;
}
QPixmapCache::remove( id );
id.clear();
}
void findInCache(QPixmap& p, const QString& elementId)
{
createRenderer();
id = QString::fromLatin1("%3_%2_%1")
.arg(size.width())
.arg(size.height())
.arg(path);
if (!elementId.isEmpty()) {
id.append(elementId);
}
if (QPixmapCache::find(id, p)) {
//kDebug() << "found cached version of " << id << endl;
return;
} else {
//kDebug() << "didn't find cached version of " << id << ", so re-rendering" << endl;
}
// we have to re-render this puppy
QSize s;
if (elementId.isEmpty()) {
s = size.toSize();
} else {
s = renderer->boundsOnElement(elementId).size().toSize();
}
//kDebug() << "size for " << elementId << " is " << s << endl;
p = QPixmap(s);
p.fill(Qt::transparent);
QPainter renderPainter(&p);
if (elementId.isEmpty()) {
renderer->render(&renderPainter);
} else {
renderer->render(&renderPainter, elementId);
}
renderPainter.end();
QPixmapCache::insert( id, p );
}
void createRenderer()
{
if (renderer) {
return;
}
if (themed && path.isNull()) {
path = Plasma::Theme::self()->image(themePath);
}
//TODO: connect the renderer's repaintNeeded to the Plasma::Svg signal
// take into consideration for cache, e.g. don't cache if svg is animated
renderer = new KSvgRenderer(path);
}
//TODO: share renderers between Svg objects with identical themePath
KSvgRenderer* renderer;
QString themePath;
QString path;
QString id;
QSizeF size;
bool themed;
};
Svg::Svg( const QString& imagePath, QObject* parent )
: QObject( parent ),
d( new Private( imagePath ) )
{
if (d->themed) {
connect(Plasma::Theme::self(), SIGNAL(changed()), this, SLOT(themeChanged()));
}
}
Svg::~Svg()
{
}
void Svg::paint(QPainter* painter, const QPointF& point, const QString& elementID)
{
QPixmap pix;
d->findInCache(pix, elementID);
painter->drawPixmap(point.toPoint(), pix);
}
void Svg::paint(QPainter* painter, int x, int y, const QString& elementID)
{
paint(painter, QPointF( x, y ), elementID);
}
void Svg::paint(QPainter* painter, const QRectF& rect, const QString& elementID)
{
QPixmap pix;
d->findInCache(pix, elementID);
painter->drawPixmap(rect, pix, QRectF(QPointF(0,0), pix.size()));
}
void Svg::resize( int width, int height )
{
resize( QSize( width, height ) );
}
void Svg::resize( const QSizeF& size )
{
d->size = size;
}
void Svg::resize()
{
d->createRenderer();
d->size = d->renderer->defaultSize();
}
QSize Svg::elementSize(const QString& elementId) const
{
d->createRenderer();
QSizeF elementSize = d->renderer->boundsOnElement(elementId).size();
QSizeF naturalSize = d->renderer->defaultSize();
qreal dx = d->size.width() / naturalSize.width();
qreal dy = d->size.height() / naturalSize.height();
elementSize.scale( elementSize.width() * dx, elementSize.height() * dy, Qt::IgnoreAspectRatio );
return elementSize.toSize();
}
QSize Svg::size() const
{
return d->size.toSize();
}
void Svg::themeChanged()
{
d->removeFromCache();
d->path.clear();
delete d->renderer;
d->renderer = 0;
emit repaintNeeded();
}
} // Plasma namespace
#include "svg.moc"