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<h1 class="title">imagecomposer.cpp Example File</h1>
<span class="small-subtitle">painting/imagecomposition/imagecomposer.cpp</span>
<!-- $$$painting/imagecomposition/imagecomposer.cpp-description -->
<div class="descr"> <a name="details"></a>
<pre class="cpp"> <span class="comment">/****************************************************************************
**
** Copyright (C) 2015 The Qt Company Ltd.
** Contact: http://www.qt.io/licensing/
**
** This file is part of the examples of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:BSD$
** You may use this file under the terms of the BSD license as follows:
**
** &quot;Redistribution and use in source and binary forms, with or without
** modification, are permitted provided that the following conditions are
** met:
** * Redistributions of source code must retain the above copyright
** notice, this list of conditions and the following disclaimer.
** * Redistributions in binary form must reproduce the above copyright
** notice, this list of conditions and the following disclaimer in
** the documentation and/or other materials provided with the
** distribution.
** * Neither the name of The Qt Company Ltd nor the names of its
** contributors may be used to endorse or promote products derived
** from this software without specific prior written permission.
**
**
** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
** &quot;AS IS&quot; AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.&quot;
**
** $QT_END_LICENSE$
**
****************************************************************************/</span>
<span class="preprocessor">#include &lt;QtGui&gt;</span>
<span class="preprocessor">#include &quot;imagecomposer.h&quot;</span>
<span class="preprocessor">#if defined(Q_OS_SYMBIAN) || defined(Q_WS_SIMULATOR)</span>
<span class="keyword">static</span> <span class="keyword">const</span> <span class="type"><a href="qsize.html">QSize</a></span> resultSize(<span class="number">50</span><span class="operator">,</span> <span class="number">50</span>);
<span class="preprocessor">#else</span>
<span class="keyword">static</span> <span class="keyword">const</span> <span class="type"><a href="qsize.html">QSize</a></span> resultSize(<span class="number">200</span><span class="operator">,</span> <span class="number">200</span>);
<span class="preprocessor">#endif</span>
ImageComposer<span class="operator">::</span>ImageComposer()
{
sourceButton <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qtoolbutton.html">QToolButton</a></span>;
sourceButton<span class="operator">-</span><span class="operator">&gt;</span>setIconSize(resultSize);
operatorComboBox <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qcombobox.html">QComboBox</a></span>;
addOp(<span class="type"><a href="qpainter.html">QPainter</a></span><span class="operator">::</span>CompositionMode_SourceOver<span class="operator">,</span> tr(<span class="string">&quot;SourceOver&quot;</span>));
addOp(<span class="type"><a href="qpainter.html">QPainter</a></span><span class="operator">::</span>CompositionMode_DestinationOver<span class="operator">,</span> tr(<span class="string">&quot;DestinationOver&quot;</span>));
addOp(<span class="type"><a href="qpainter.html">QPainter</a></span><span class="operator">::</span>CompositionMode_Clear<span class="operator">,</span> tr(<span class="string">&quot;Clear&quot;</span>));
addOp(<span class="type"><a href="qpainter.html">QPainter</a></span><span class="operator">::</span>CompositionMode_Source<span class="operator">,</span> tr(<span class="string">&quot;Source&quot;</span>));
addOp(<span class="type"><a href="qpainter.html">QPainter</a></span><span class="operator">::</span>CompositionMode_Destination<span class="operator">,</span> tr(<span class="string">&quot;Destination&quot;</span>));
addOp(<span class="type"><a href="qpainter.html">QPainter</a></span><span class="operator">::</span>CompositionMode_SourceIn<span class="operator">,</span> tr(<span class="string">&quot;SourceIn&quot;</span>));
addOp(<span class="type"><a href="qpainter.html">QPainter</a></span><span class="operator">::</span>CompositionMode_DestinationIn<span class="operator">,</span> tr(<span class="string">&quot;DestinationIn&quot;</span>));
addOp(<span class="type"><a href="qpainter.html">QPainter</a></span><span class="operator">::</span>CompositionMode_SourceOut<span class="operator">,</span> tr(<span class="string">&quot;SourceOut&quot;</span>));
addOp(<span class="type"><a href="qpainter.html">QPainter</a></span><span class="operator">::</span>CompositionMode_DestinationOut<span class="operator">,</span> tr(<span class="string">&quot;DestinationOut&quot;</span>));
addOp(<span class="type"><a href="qpainter.html">QPainter</a></span><span class="operator">::</span>CompositionMode_SourceAtop<span class="operator">,</span> tr(<span class="string">&quot;SourceAtop&quot;</span>));
addOp(<span class="type"><a href="qpainter.html">QPainter</a></span><span class="operator">::</span>CompositionMode_DestinationAtop<span class="operator">,</span> tr(<span class="string">&quot;DestinationAtop&quot;</span>));
addOp(<span class="type"><a href="qpainter.html">QPainter</a></span><span class="operator">::</span>CompositionMode_Xor<span class="operator">,</span> tr(<span class="string">&quot;Xor&quot;</span>));
addOp(<span class="type"><a href="qpainter.html">QPainter</a></span><span class="operator">::</span>CompositionMode_Plus<span class="operator">,</span> tr(<span class="string">&quot;Plus&quot;</span>));
addOp(<span class="type"><a href="qpainter.html">QPainter</a></span><span class="operator">::</span>CompositionMode_Multiply<span class="operator">,</span> tr(<span class="string">&quot;Multiply&quot;</span>));
addOp(<span class="type"><a href="qpainter.html">QPainter</a></span><span class="operator">::</span>CompositionMode_Screen<span class="operator">,</span> tr(<span class="string">&quot;Screen&quot;</span>));
addOp(<span class="type"><a href="qpainter.html">QPainter</a></span><span class="operator">::</span>CompositionMode_Overlay<span class="operator">,</span> tr(<span class="string">&quot;Overlay&quot;</span>));
addOp(<span class="type"><a href="qpainter.html">QPainter</a></span><span class="operator">::</span>CompositionMode_Darken<span class="operator">,</span> tr(<span class="string">&quot;Darken&quot;</span>));
addOp(<span class="type"><a href="qpainter.html">QPainter</a></span><span class="operator">::</span>CompositionMode_Lighten<span class="operator">,</span> tr(<span class="string">&quot;Lighten&quot;</span>));
addOp(<span class="type"><a href="qpainter.html">QPainter</a></span><span class="operator">::</span>CompositionMode_ColorDodge<span class="operator">,</span> tr(<span class="string">&quot;ColorDodge&quot;</span>));
addOp(<span class="type"><a href="qpainter.html">QPainter</a></span><span class="operator">::</span>CompositionMode_ColorBurn<span class="operator">,</span> tr(<span class="string">&quot;ColorBurn&quot;</span>));
addOp(<span class="type"><a href="qpainter.html">QPainter</a></span><span class="operator">::</span>CompositionMode_HardLight<span class="operator">,</span> tr(<span class="string">&quot;HardLight&quot;</span>));
addOp(<span class="type"><a href="qpainter.html">QPainter</a></span><span class="operator">::</span>CompositionMode_SoftLight<span class="operator">,</span> tr(<span class="string">&quot;SoftLight&quot;</span>));
addOp(<span class="type"><a href="qpainter.html">QPainter</a></span><span class="operator">::</span>CompositionMode_Difference<span class="operator">,</span> tr(<span class="string">&quot;Difference&quot;</span>));
addOp(<span class="type"><a href="qpainter.html">QPainter</a></span><span class="operator">::</span>CompositionMode_Exclusion<span class="operator">,</span> tr(<span class="string">&quot;Exclusion&quot;</span>));
destinationButton <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qtoolbutton.html">QToolButton</a></span>;
destinationButton<span class="operator">-</span><span class="operator">&gt;</span>setIconSize(resultSize);
equalLabel <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qlabel.html">QLabel</a></span>(tr(<span class="string">&quot;=&quot;</span>));
resultLabel <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qlabel.html">QLabel</a></span>;
resultLabel<span class="operator">-</span><span class="operator">&gt;</span>setMinimumWidth(resultSize<span class="operator">.</span>width());
connect(sourceButton<span class="operator">,</span> SIGNAL(clicked())<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(chooseSource()));
connect(operatorComboBox<span class="operator">,</span> SIGNAL(activated(<span class="type">int</span>))<span class="operator">,</span>
<span class="keyword">this</span><span class="operator">,</span> SLOT(recalculateResult()));
connect(destinationButton<span class="operator">,</span> SIGNAL(clicked())<span class="operator">,</span>
<span class="keyword">this</span><span class="operator">,</span> SLOT(chooseDestination()));
<span class="type"><a href="qgridlayout.html">QGridLayout</a></span> <span class="operator">*</span>mainLayout <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qgridlayout.html">QGridLayout</a></span>;
mainLayout<span class="operator">-</span><span class="operator">&gt;</span>addWidget(sourceButton<span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="number">3</span><span class="operator">,</span> <span class="number">1</span>);
mainLayout<span class="operator">-</span><span class="operator">&gt;</span>addWidget(operatorComboBox<span class="operator">,</span> <span class="number">1</span><span class="operator">,</span> <span class="number">1</span>);
mainLayout<span class="operator">-</span><span class="operator">&gt;</span>addWidget(destinationButton<span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="number">2</span><span class="operator">,</span> <span class="number">3</span><span class="operator">,</span> <span class="number">1</span>);
mainLayout<span class="operator">-</span><span class="operator">&gt;</span>addWidget(equalLabel<span class="operator">,</span> <span class="number">1</span><span class="operator">,</span> <span class="number">3</span>);
mainLayout<span class="operator">-</span><span class="operator">&gt;</span>addWidget(resultLabel<span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="number">4</span><span class="operator">,</span> <span class="number">3</span><span class="operator">,</span> <span class="number">1</span>);
<span class="preprocessor">#if defined(Q_OS_SYMBIAN) || defined(Q_WS_MAEMO_5) || defined(Q_WS_SIMULATOR)</span>
<span class="preprocessor">#else</span>
mainLayout<span class="operator">-</span><span class="operator">&gt;</span>setSizeConstraint(<span class="type"><a href="qlayout.html">QLayout</a></span><span class="operator">::</span>SetFixedSize);
<span class="preprocessor">#endif</span>
setLayout(mainLayout);
resultImage <span class="operator">=</span> <span class="type"><a href="qimage.html">QImage</a></span>(resultSize<span class="operator">,</span> <span class="type"><a href="qimage.html">QImage</a></span><span class="operator">::</span>Format_ARGB32_Premultiplied);
loadImage(<span class="string">&quot;:/images/butterfly.png&quot;</span><span class="operator">,</span> <span class="operator">&amp;</span>sourceImage<span class="operator">,</span> sourceButton);
loadImage(<span class="string">&quot;:/images/checker.png&quot;</span><span class="operator">,</span> <span class="operator">&amp;</span>destinationImage<span class="operator">,</span> destinationButton);
setWindowTitle(tr(<span class="string">&quot;Image Composition&quot;</span>));
}
<span class="type">void</span> ImageComposer<span class="operator">::</span>chooseSource()
{
chooseImage(tr(<span class="string">&quot;Choose Source Image&quot;</span>)<span class="operator">,</span> <span class="operator">&amp;</span>sourceImage<span class="operator">,</span> sourceButton);
}
<span class="type">void</span> ImageComposer<span class="operator">::</span>chooseDestination()
{
chooseImage(tr(<span class="string">&quot;Choose Destination Image&quot;</span>)<span class="operator">,</span> <span class="operator">&amp;</span>destinationImage<span class="operator">,</span>
destinationButton);
}
<span class="type">void</span> ImageComposer<span class="operator">::</span>recalculateResult()
{
<span class="type"><a href="qpainter.html">QPainter</a></span><span class="operator">::</span>CompositionMode mode <span class="operator">=</span> currentMode();
<span class="type"><a href="qpainter.html">QPainter</a></span> painter(<span class="operator">&amp;</span>resultImage);
painter<span class="operator">.</span>setCompositionMode(<span class="type"><a href="qpainter.html">QPainter</a></span><span class="operator">::</span>CompositionMode_Source);
painter<span class="operator">.</span>fillRect(resultImage<span class="operator">.</span>rect()<span class="operator">,</span> <span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>transparent);
painter<span class="operator">.</span>setCompositionMode(<span class="type"><a href="qpainter.html">QPainter</a></span><span class="operator">::</span>CompositionMode_SourceOver);
painter<span class="operator">.</span>drawImage(<span class="number">0</span><span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> destinationImage);
painter<span class="operator">.</span>setCompositionMode(mode);
painter<span class="operator">.</span>drawImage(<span class="number">0</span><span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> sourceImage);
painter<span class="operator">.</span>setCompositionMode(<span class="type"><a href="qpainter.html">QPainter</a></span><span class="operator">::</span>CompositionMode_DestinationOver);
painter<span class="operator">.</span>fillRect(resultImage<span class="operator">.</span>rect()<span class="operator">,</span> <span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>white);
painter<span class="operator">.</span>end();
resultLabel<span class="operator">-</span><span class="operator">&gt;</span>setPixmap(<span class="type"><a href="qpixmap.html">QPixmap</a></span><span class="operator">::</span>fromImage(resultImage));
}
<span class="type">void</span> ImageComposer<span class="operator">::</span>addOp(<span class="type"><a href="qpainter.html">QPainter</a></span><span class="operator">::</span>CompositionMode mode<span class="operator">,</span> <span class="keyword">const</span> <span class="type"><a href="qstring.html">QString</a></span> <span class="operator">&amp;</span>name)
{
operatorComboBox<span class="operator">-</span><span class="operator">&gt;</span>addItem(name<span class="operator">,</span> mode);
}
<span class="type">void</span> ImageComposer<span class="operator">::</span>chooseImage(<span class="keyword">const</span> <span class="type"><a href="qstring.html">QString</a></span> <span class="operator">&amp;</span>title<span class="operator">,</span> <span class="type"><a href="qimage.html">QImage</a></span> <span class="operator">*</span>image<span class="operator">,</span>
<span class="type"><a href="qtoolbutton.html">QToolButton</a></span> <span class="operator">*</span>button)
{
<span class="type"><a href="qstring.html">QString</a></span> fileName <span class="operator">=</span> <span class="type"><a href="qfiledialog.html">QFileDialog</a></span><span class="operator">::</span>getOpenFileName(<span class="keyword">this</span><span class="operator">,</span> title);
<span class="keyword">if</span> (<span class="operator">!</span>fileName<span class="operator">.</span>isEmpty())
loadImage(fileName<span class="operator">,</span> image<span class="operator">,</span> button);
}
<span class="type">void</span> ImageComposer<span class="operator">::</span>loadImage(<span class="keyword">const</span> <span class="type"><a href="qstring.html">QString</a></span> <span class="operator">&amp;</span>fileName<span class="operator">,</span> <span class="type"><a href="qimage.html">QImage</a></span> <span class="operator">*</span>image<span class="operator">,</span>
<span class="type"><a href="qtoolbutton.html">QToolButton</a></span> <span class="operator">*</span>button)
{
image<span class="operator">-</span><span class="operator">&gt;</span>load(fileName);
<span class="comment">// Scale the image to given size</span>
<span class="operator">*</span>image <span class="operator">=</span> image<span class="operator">-</span><span class="operator">&gt;</span>scaled(resultSize<span class="operator">,</span> <span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>KeepAspectRatio);
<span class="type"><a href="qimage.html">QImage</a></span> fixedImage(resultSize<span class="operator">,</span> <span class="type"><a href="qimage.html">QImage</a></span><span class="operator">::</span>Format_ARGB32_Premultiplied);
<span class="type"><a href="qpainter.html">QPainter</a></span> painter(<span class="operator">&amp;</span>fixedImage);
painter<span class="operator">.</span>setCompositionMode(<span class="type"><a href="qpainter.html">QPainter</a></span><span class="operator">::</span>CompositionMode_Source);
painter<span class="operator">.</span>fillRect(fixedImage<span class="operator">.</span>rect()<span class="operator">,</span> <span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>transparent);
painter<span class="operator">.</span>setCompositionMode(<span class="type"><a href="qpainter.html">QPainter</a></span><span class="operator">::</span>CompositionMode_SourceOver);
painter<span class="operator">.</span>drawImage(imagePos(<span class="operator">*</span>image)<span class="operator">,</span> <span class="operator">*</span>image);
painter<span class="operator">.</span>end();
button<span class="operator">-</span><span class="operator">&gt;</span>setIcon(<span class="type"><a href="qpixmap.html">QPixmap</a></span><span class="operator">::</span>fromImage(fixedImage));
<span class="operator">*</span>image <span class="operator">=</span> fixedImage;
recalculateResult();
}
<span class="type"><a href="qpainter.html">QPainter</a></span><span class="operator">::</span>CompositionMode ImageComposer<span class="operator">::</span>currentMode() <span class="keyword">const</span>
{
<span class="keyword">return</span> (<span class="type"><a href="qpainter.html">QPainter</a></span><span class="operator">::</span>CompositionMode)
operatorComboBox<span class="operator">-</span><span class="operator">&gt;</span>itemData(operatorComboBox<span class="operator">-</span><span class="operator">&gt;</span>currentIndex())<span class="operator">.</span>toInt();
}
<span class="type"><a href="qpoint.html">QPoint</a></span> ImageComposer<span class="operator">::</span>imagePos(<span class="keyword">const</span> <span class="type"><a href="qimage.html">QImage</a></span> <span class="operator">&amp;</span>image) <span class="keyword">const</span>
{
<span class="keyword">return</span> <span class="type"><a href="qpoint.html">QPoint</a></span>((resultSize<span class="operator">.</span>width() <span class="operator">-</span> image<span class="operator">.</span>width()) <span class="operator">/</span> <span class="number">2</span><span class="operator">,</span>
(resultSize<span class="operator">.</span>height() <span class="operator">-</span> image<span class="operator">.</span>height()) <span class="operator">/</span> <span class="number">2</span>);
}</pre>
</div>
<!-- @@@painting/imagecomposition/imagecomposer.cpp -->
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