demos/qtdemo/imageitem.cpp
author Alex Gilkes <alex.gilkes@nokia.com>
Mon, 11 Jan 2010 14:00:40 +0000
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/****************************************************************************
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**
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** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
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** All rights reserved.
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** Contact: Nokia Corporation (qt-info@nokia.com)
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**
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** This file is part of the demonstration applications of the Qt Toolkit.
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**
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** $QT_BEGIN_LICENSE:LGPL$
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** No Commercial Usage
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** This file contains pre-release code and may not be distributed.
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** You may use this file in accordance with the terms and conditions
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** contained in the Technology Preview License Agreement accompanying
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** this package.
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**
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** GNU Lesser General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU Lesser
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** General Public License version 2.1 as published by the Free Software
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** Foundation and appearing in the file LICENSE.LGPL included in the
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** packaging of this file.  Please review the following information to
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** ensure the GNU Lesser General Public License version 2.1 requirements
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** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
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**
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** In addition, as a special exception, Nokia gives you certain additional
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** rights.  These rights are described in the Nokia Qt LGPL Exception
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** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
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**
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** If you have questions regarding the use of this file, please contact
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** Nokia at qt-info@nokia.com.
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**
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**
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**
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**
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**
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**
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**
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**
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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#include "imageitem.h"
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#include "colors.h"
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ImageItem::ImageItem(const QImage &image, int maxWidth, int maxHeight, QGraphicsScene *scene,
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        QGraphicsItem *parent, bool adjustSize, float scale) : DemoItem(scene, parent)
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{
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    this->image = image;
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    this->maxWidth = maxWidth;
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    this->maxHeight = maxHeight;
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    this->adjustSize = adjustSize;
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    this->scale = scale;
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}
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QImage *ImageItem::createImage(const QMatrix &matrix) const
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{
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    QImage *original = new QImage(image);
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    if (original->isNull()){
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        return original; // nothing we can do about it...
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    }
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    QPoint size = matrix.map(QPoint(this->maxWidth, this->maxHeight));
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    float w = size.x(); // x, y is the used as width, height
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    float h = size.y();
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    // Optimization: if image is smaller than maximum allowed size, just return the loaded image
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    if (original->size().height() <= h && original->size().width() <= w && !this->adjustSize && this->scale == 1)
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        return original;
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    // Calculate what the size of the final image will be:
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    w = qMin(w, float(original->size().width()) * this->scale);
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    h = qMin(h, float(original->size().height()) * this->scale);
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    float adjustx = 1.0f;
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    float adjusty = 1.0f;
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    if (this->adjustSize){
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        adjustx = qMin(matrix.m11(), matrix.m22());
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        adjusty = matrix.m22() < adjustx ? adjustx : matrix.m22();
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        w *= adjustx;
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        h *= adjusty;
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    }
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    // Create a new image with correct size, and draw original on it
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    QImage *image = new QImage(int(w+2), int(h+2), QImage::Format_ARGB32_Premultiplied);
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    image->fill(QColor(0, 0, 0, 0).rgba());
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    QPainter painter(image);
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    painter.setRenderHints(QPainter::Antialiasing | QPainter::SmoothPixmapTransform);
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    if (this->adjustSize)
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        painter.scale(adjustx, adjusty);
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    if (this->scale != 1)
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       painter.scale(this->scale, this->scale);
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    painter.drawImage(0, 0, *original);
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    if (!this->adjustSize){
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       // Blur out edges
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       int blur = 30;
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       if (h < original->height()){
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           QLinearGradient brush1(0, h - blur, 0, h);
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           brush1.setSpread(QGradient::PadSpread);
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           brush1.setColorAt(0.0, QColor(0, 0, 0, 0));
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           brush1.setColorAt(1.0, Colors::sceneBg1);
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           painter.fillRect(0, int(h) - blur, original->width(), int(h), brush1);
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       }
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       if (w < original->width()){
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           QLinearGradient brush2(w - blur, 0, w, 0);
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           brush2.setSpread(QGradient::PadSpread);
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           brush2.setColorAt(0.0, QColor(0, 0, 0, 0));
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           brush2.setColorAt(1.0, Colors::sceneBg1);
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           painter.fillRect(int(w) - blur, 0, int(w), original->height(), brush2);
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       }
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    }
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    delete original;
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    return image;
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}