plasma-framework/glapplet.cpp

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/*
* Copyright 2007 Zack Rusin <zack@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 as
* published by the Free Software Foundation; either version 2, or
* (at your option) any later version.
*
* 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 "glapplet.h"
#include <QtOpenGL/QGLPixelBuffer>
#include <QtGui/QPainter>
#include <QtGui/QImage>
namespace Plasma {
class GLApplet::Private
{
public:
Private()
{
init();
}
~Private()
{
delete pbuf;
delete dummy;
}
void init()
{
dummy = new QGLWidget((QWidget *) 0);
QGLFormat format = QGLFormat::defaultFormat();
format.setSampleBuffers(true);
format.setAlphaBufferSize(8);
//dummy size construction
pbuf = new QGLPixelBuffer(300, 300, format, dummy);
if (pbuf->isValid())
pbuf->makeCurrent();
}
void updateGlSize(const QSize &size)
{
if (size.width() > pbuf->width() ||
size.height() > pbuf->height()) {
QGLFormat format = pbuf->format();
delete pbuf;
pbuf = new QGLPixelBuffer(size, format, dummy);
}
}
public:
QGLPixelBuffer *pbuf;
QGLWidget *dummy;
};
GLApplet::GLApplet(QGraphicsItem *parent,
const QString &serviceId,
int appletId)
: Applet(parent, serviceId, appletId),
d(new Private)
{
if (!d->dummy->isValid() ||
!d->pbuf->isValid()) {
setFailedToLaunch(true, i18n("This system does not support OpenGL applets."));
}
}
GLApplet::GLApplet(QObject *parent, const QVariantList &args)
: Applet(parent, args),
d(new Private)
{
}
GLApplet::~GLApplet()
{
delete d;
}
GLuint GLApplet::bindTexture(const QImage &image, GLenum target)
{
Q_ASSERT(d->pbuf);
if (!d->dummy->isValid())
return 0;
return d->dummy->bindTexture(image, target);
}
void GLApplet::deleteTexture(GLuint textureId)
{
Q_ASSERT(d->pbuf);
d->dummy->deleteTexture(textureId);
}
void GLApplet::paintGLInterface(QPainter *painter,
const QStyleOptionGraphicsItem *option)
{
Q_UNUSED(painter)
Q_UNUSED(option)
}
static inline QPainterPath headerPath(const QRectF &r, int roundness,
int headerHeight=10)
{
QPainterPath path;
int xRnd = roundness;
int yRnd = roundness;
if (r.width() > r.height())
xRnd = int(roundness * r.height()/r.width());
else
yRnd = int(roundness * r.width()/r.height());
if(xRnd >= 100) // fix ranges
xRnd = 99;
if(yRnd >= 100)
yRnd = 99;
if(xRnd <= 0 || yRnd <= 0) { // add normal rectangle
path.addRect(r);
return path;
}
QRectF rect = r.normalized();
if (rect.isNull())
return path;
qreal x = rect.x();
qreal y = rect.y();
qreal w = rect.width();
qreal h = rect.height();
qreal rxx = w*xRnd/200;
qreal ryy = h*yRnd/200;
// were there overflows?
if (rxx < 0)
rxx = w/200*xRnd;
if (ryy < 0)
ryy = h/200*yRnd;
qreal rxx2 = 2*rxx;
qreal ryy2 = 2*ryy;
path.arcMoveTo(x, y, rxx2, ryy2, 90);
path.arcTo(x, y, rxx2, ryy2, 90, 90);
QPointF pt = path.currentPosition();
path.lineTo(x, pt.y()+headerHeight);
path.lineTo(x+w, pt.y()+headerHeight);
path.lineTo(x+w, pt.y());
path.arcTo(x+w-rxx2, y, rxx2, ryy2, 0, 90);
path.closeSubpath();
return path;
}
void GLApplet::paintInterface(QPainter *painter,
const QStyleOptionGraphicsItem *option,
const QRect &contentsRect)
{
Q_UNUSED(contentsRect)
Q_ASSERT(d->pbuf);
if ((!d->dummy->isValid() ||
!d->pbuf->isValid())) {
if (!failedToLaunch()) {
setFailedToLaunch(true, i18n("Your machine does not support OpenGL applets."));
}
return;
}
d->pbuf->makeCurrent();
// handle background filling
glClearColor(0, 0, 0, 0);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
QMatrix m = painter->worldMatrix();
QRect deviceRect = m.mapRect(boundingRect()).toRect();
d->updateGlSize(deviceRect.size());
// redirect this widget's painting into the pbuffer
QPainter p(d->pbuf);
paintGLInterface(&p, option);
// draw the pbuffer contents to the backingstore
QImage image = d->pbuf->toImage();
painter->drawImage(0, 0, image);
}
void GLApplet::makeCurrent()
{
if (!d->dummy->isValid() ||
!d->pbuf->isValid())
d->dummy->makeCurrent();
}
} // Plasma namespace
#include "glapplet.moc"