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/****************************************************************************
**
** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/
**
** This file is part of the demonstration applications of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** GNU Lesser General Public License Usage
** 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 1.1, 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.
**
** Other Usage
** Alternatively, this file may be used in accordance with the terms and
** conditions contained in a signed written agreement between you and Nokia.
**
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "imageitem.h"
#include "colors.h"
ImageItem::ImageItem(const QImage &image, int maxWidth, int maxHeight, QGraphicsScene *scene,
QGraphicsItem *parent, bool adjustSize, float scale) : DemoItem(scene, parent)
{
this->image = image;
this->maxWidth = maxWidth;
this->maxHeight = maxHeight;
this->adjustSize = adjustSize;
this->scale = scale;
}
QImage *ImageItem::createImage(const QMatrix &matrix) const
{
QImage *original = new QImage(image);
if (original->isNull()){
return original; // nothing we can do about it...
}
QPoint size = matrix.map(QPoint(this->maxWidth, this->maxHeight));
float w = size.x(); // x, y is the used as width, height
float h = size.y();
// Optimization: if image is smaller than maximum allowed size, just return the loaded image
if (original->size().height() <= h && original->size().width() <= w && !this->adjustSize && this->scale == 1)
return original;
// Calculate what the size of the final image will be:
w = qMin(w, float(original->size().width()) * this->scale);
h = qMin(h, float(original->size().height()) * this->scale);
float adjustx = 1.0f;
float adjusty = 1.0f;
if (this->adjustSize){
adjustx = qMin(matrix.m11(), matrix.m22());
adjusty = matrix.m22() < adjustx ? adjustx : matrix.m22();
w *= adjustx;
h *= adjusty;
}
// Create a new image with correct size, and draw original on it
QImage *image = new QImage(int(w+2), int(h+2), QImage::Format_ARGB32_Premultiplied);
image->fill(QColor(0, 0, 0, 0).rgba());
QPainter painter(image);
painter.setRenderHints(QPainter::Antialiasing | QPainter::SmoothPixmapTransform);
if (this->adjustSize)
painter.scale(adjustx, adjusty);
if (this->scale != 1)
painter.scale(this->scale, this->scale);
painter.drawImage(0, 0, *original);
if (!this->adjustSize){
// Blur out edges
int blur = 30;
if (h < original->height()){
QLinearGradient brush1(0, h - blur, 0, h);
brush1.setSpread(QGradient::PadSpread);
brush1.setColorAt(0.0, QColor(0, 0, 0, 0));
brush1.setColorAt(1.0, Colors::sceneBg1);
painter.fillRect(0, int(h) - blur, original->width(), int(h), brush1);
}
if (w < original->width()){
QLinearGradient brush2(w - blur, 0, w, 0);
brush2.setSpread(QGradient::PadSpread);
brush2.setColorAt(0.0, QColor(0, 0, 0, 0));
brush2.setColorAt(1.0, Colors::sceneBg1);
painter.fillRect(int(w) - blur, 0, int(w), original->height(), brush2);
}
}
delete original;
return image;
}
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