/****************************************************************************+
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**+
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** Copyright (C) 2010 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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+
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#include "imageitem.h"+
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#include "colors.h"+
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+
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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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+
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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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+
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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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+
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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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+
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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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+
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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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+
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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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+
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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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}+
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