<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE html> <html lang="en"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>imagecomposer.cpp Example File | Qt Widgets 5.9</title> <link rel="stylesheet" type="text/css" href="style/offline-simple.css" /> <script type="text/javascript"> document.getElementsByTagName("link").item(0).setAttribute("href", "style/offline.css"); // loading style sheet breaks anchors that were jumped to before // so force jumping to anchor again setTimeout(function() { var anchor = location.hash; // need to jump to different anchor first (e.g. none) location.hash = "#"; setTimeout(function() { location.hash = anchor; }, 0); }, 0); </script> </head> <body> <div class="header" id="qtdocheader"> <div class="main"> <div class="main-rounded"> <div class="navigationbar"> <table><tr> <td >Qt 5.9</td><td ><a href="qtwidgets-index.html">Qt Widgets</a></td><td ><a href="qtwidgets-painting-imagecomposition-example.html">Image Composition Example</a></td><td >imagecomposer.cpp Example File</td></tr></table><table class="buildversion"><tr> <td id="buildversion" width="100%" align="right">Qt 5.9.4 Reference Documentation</td> </tr></table> </div> </div> <div class="content"> <div class="line"> <div class="content mainContent"> <div class="sidebar"><div class="sidebar-content" id="sidebar-content"></div></div> <h1 class="title">imagecomposer.cpp Example File</h1> <span class="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) 2016 The Qt Company Ltd. ** Contact: https://www.qt.io/licensing/ ** ** This file is part of the examples of the Qt Toolkit. ** ** $QT_BEGIN_LICENSE:BSD$ ** Commercial License Usage ** Licensees holding valid commercial Qt licenses may use this file in ** accordance with the commercial license agreement provided with the ** Software or, alternatively, in accordance with the terms contained in ** a written agreement between you and The Qt Company. For licensing terms ** and conditions see https://www.qt.io/terms-conditions. For further ** information use the contact form at https://www.qt.io/contact-us. ** ** BSD License Usage ** Alternatively, you may use this file under the terms of the BSD license ** as follows: ** ** "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 ** "AS IS" 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." ** ** $QT_END_LICENSE$ ** ****************************************************************************/</span> <span class="preprocessor">#include "imagecomposer.h"</span> <span class="preprocessor">#include <QtWidgets></span> <span class="keyword">static</span> <span class="keyword">const</span> <span class="type"><a href="../qtcore/qsize.html">QSize</a></span> resultSize(<span class="number">200</span><span class="operator">,</span> <span class="number">200</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">></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="../qtgui/qpainter.html">QPainter</a></span><span class="operator">::</span>CompositionMode_SourceOver<span class="operator">,</span> tr(<span class="string">"SourceOver"</span>)); addOp(<span class="type"><a href="../qtgui/qpainter.html">QPainter</a></span><span class="operator">::</span>CompositionMode_DestinationOver<span class="operator">,</span> tr(<span class="string">"DestinationOver"</span>)); addOp(<span class="type"><a href="../qtgui/qpainter.html">QPainter</a></span><span class="operator">::</span>CompositionMode_Clear<span class="operator">,</span> tr(<span class="string">"Clear"</span>)); addOp(<span class="type"><a href="../qtgui/qpainter.html">QPainter</a></span><span class="operator">::</span>CompositionMode_Source<span class="operator">,</span> tr(<span class="string">"Source"</span>)); addOp(<span class="type"><a href="../qtgui/qpainter.html">QPainter</a></span><span class="operator">::</span>CompositionMode_Destination<span class="operator">,</span> tr(<span class="string">"Destination"</span>)); addOp(<span class="type"><a href="../qtgui/qpainter.html">QPainter</a></span><span class="operator">::</span>CompositionMode_SourceIn<span class="operator">,</span> tr(<span class="string">"SourceIn"</span>)); addOp(<span class="type"><a href="../qtgui/qpainter.html">QPainter</a></span><span class="operator">::</span>CompositionMode_DestinationIn<span class="operator">,</span> tr(<span class="string">"DestinationIn"</span>)); addOp(<span class="type"><a href="../qtgui/qpainter.html">QPainter</a></span><span class="operator">::</span>CompositionMode_SourceOut<span class="operator">,</span> tr(<span class="string">"SourceOut"</span>)); addOp(<span class="type"><a href="../qtgui/qpainter.html">QPainter</a></span><span class="operator">::</span>CompositionMode_DestinationOut<span class="operator">,</span> tr(<span class="string">"DestinationOut"</span>)); addOp(<span class="type"><a href="../qtgui/qpainter.html">QPainter</a></span><span class="operator">::</span>CompositionMode_SourceAtop<span class="operator">,</span> tr(<span class="string">"SourceAtop"</span>)); addOp(<span class="type"><a href="../qtgui/qpainter.html">QPainter</a></span><span class="operator">::</span>CompositionMode_DestinationAtop<span class="operator">,</span> tr(<span class="string">"DestinationAtop"</span>)); addOp(<span class="type"><a href="../qtgui/qpainter.html">QPainter</a></span><span class="operator">::</span>CompositionMode_Xor<span class="operator">,</span> tr(<span class="string">"Xor"</span>)); addOp(<span class="type"><a href="../qtgui/qpainter.html">QPainter</a></span><span class="operator">::</span>CompositionMode_Plus<span class="operator">,</span> tr(<span class="string">"Plus"</span>)); addOp(<span class="type"><a href="../qtgui/qpainter.html">QPainter</a></span><span class="operator">::</span>CompositionMode_Multiply<span class="operator">,</span> tr(<span class="string">"Multiply"</span>)); addOp(<span class="type"><a href="../qtgui/qpainter.html">QPainter</a></span><span class="operator">::</span>CompositionMode_Screen<span class="operator">,</span> tr(<span class="string">"Screen"</span>)); addOp(<span class="type"><a href="../qtgui/qpainter.html">QPainter</a></span><span class="operator">::</span>CompositionMode_Overlay<span class="operator">,</span> tr(<span class="string">"Overlay"</span>)); addOp(<span class="type"><a href="../qtgui/qpainter.html">QPainter</a></span><span class="operator">::</span>CompositionMode_Darken<span class="operator">,</span> tr(<span class="string">"Darken"</span>)); addOp(<span class="type"><a href="../qtgui/qpainter.html">QPainter</a></span><span class="operator">::</span>CompositionMode_Lighten<span class="operator">,</span> tr(<span class="string">"Lighten"</span>)); addOp(<span class="type"><a href="../qtgui/qpainter.html">QPainter</a></span><span class="operator">::</span>CompositionMode_ColorDodge<span class="operator">,</span> tr(<span class="string">"ColorDodge"</span>)); addOp(<span class="type"><a href="../qtgui/qpainter.html">QPainter</a></span><span class="operator">::</span>CompositionMode_ColorBurn<span class="operator">,</span> tr(<span class="string">"ColorBurn"</span>)); addOp(<span class="type"><a href="../qtgui/qpainter.html">QPainter</a></span><span class="operator">::</span>CompositionMode_HardLight<span class="operator">,</span> tr(<span class="string">"HardLight"</span>)); addOp(<span class="type"><a href="../qtgui/qpainter.html">QPainter</a></span><span class="operator">::</span>CompositionMode_SoftLight<span class="operator">,</span> tr(<span class="string">"SoftLight"</span>)); addOp(<span class="type"><a href="../qtgui/qpainter.html">QPainter</a></span><span class="operator">::</span>CompositionMode_Difference<span class="operator">,</span> tr(<span class="string">"Difference"</span>)); addOp(<span class="type"><a href="../qtgui/qpainter.html">QPainter</a></span><span class="operator">::</span>CompositionMode_Exclusion<span class="operator">,</span> tr(<span class="string">"Exclusion"</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">></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">"="</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">></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">></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">></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">></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">></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">></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>); mainLayout<span class="operator">-</span><span class="operator">></span>setSizeConstraint(<span class="type"><a href="qlayout.html">QLayout</a></span><span class="operator">::</span>SetFixedSize); setLayout(mainLayout); resultImage <span class="operator">=</span> <span class="type"><a href="../qtgui/qimage.html">QImage</a></span>(resultSize<span class="operator">,</span> <span class="type"><a href="../qtgui/qimage.html">QImage</a></span><span class="operator">::</span>Format_ARGB32_Premultiplied); loadImage(<span class="string">":/images/butterfly.png"</span><span class="operator">,</span> <span class="operator">&</span>sourceImage<span class="operator">,</span> sourceButton); loadImage(<span class="string">":/images/checker.png"</span><span class="operator">,</span> <span class="operator">&</span>destinationImage<span class="operator">,</span> destinationButton); setWindowTitle(tr(<span class="string">"Image Composition"</span>)); } <span class="type">void</span> ImageComposer<span class="operator">::</span>chooseSource() { chooseImage(tr(<span class="string">"Choose Source Image"</span>)<span class="operator">,</span> <span class="operator">&</span>sourceImage<span class="operator">,</span> sourceButton); } <span class="type">void</span> ImageComposer<span class="operator">::</span>chooseDestination() { chooseImage(tr(<span class="string">"Choose Destination Image"</span>)<span class="operator">,</span> <span class="operator">&</span>destinationImage<span class="operator">,</span> destinationButton); } <span class="type">void</span> ImageComposer<span class="operator">::</span>recalculateResult() { <span class="type"><a href="../qtgui/qpainter.html">QPainter</a></span><span class="operator">::</span>CompositionMode mode <span class="operator">=</span> currentMode(); <span class="type"><a href="../qtgui/qpainter.html">QPainter</a></span> painter(<span class="operator">&</span>resultImage); painter<span class="operator">.</span>setCompositionMode(<span class="type"><a href="../qtgui/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="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>transparent); painter<span class="operator">.</span>setCompositionMode(<span class="type"><a href="../qtgui/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="../qtgui/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="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>white); painter<span class="operator">.</span>end(); resultLabel<span class="operator">-</span><span class="operator">></span>setPixmap(<span class="type"><a href="../qtgui/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="../qtgui/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="../qtcore/qstring.html">QString</a></span> <span class="operator">&</span>name) { operatorComboBox<span class="operator">-</span><span class="operator">></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="../qtcore/qstring.html">QString</a></span> <span class="operator">&</span>title<span class="operator">,</span> <span class="type"><a href="../qtgui/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="../qtcore/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="../qtcore/qstring.html">QString</a></span> <span class="operator">&</span>fileName<span class="operator">,</span> <span class="type"><a href="../qtgui/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">></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">></span>scaled(resultSize<span class="operator">,</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>KeepAspectRatio); <span class="type"><a href="../qtgui/qimage.html">QImage</a></span> fixedImage(resultSize<span class="operator">,</span> <span class="type"><a href="../qtgui/qimage.html">QImage</a></span><span class="operator">::</span>Format_ARGB32_Premultiplied); <span class="type"><a href="../qtgui/qpainter.html">QPainter</a></span> painter(<span class="operator">&</span>fixedImage); painter<span class="operator">.</span>setCompositionMode(<span class="type"><a href="../qtgui/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="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>transparent); painter<span class="operator">.</span>setCompositionMode(<span class="type"><a href="../qtgui/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">></span>setIcon(<span class="type"><a href="../qtgui/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="../qtgui/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="../qtgui/qpainter.html">QPainter</a></span><span class="operator">::</span>CompositionMode) operatorComboBox<span class="operator">-</span><span class="operator">></span>itemData(operatorComboBox<span class="operator">-</span><span class="operator">></span>currentIndex())<span class="operator">.</span>toInt(); } <span class="type"><a href="../qtcore/qpoint.html">QPoint</a></span> ImageComposer<span class="operator">::</span>imagePos(<span class="keyword">const</span> <span class="type"><a href="../qtgui/qimage.html">QImage</a></span> <span class="operator">&</span>image) <span class="keyword">const</span> { <span class="keyword">return</span> <span class="type"><a href="../qtcore/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 --> </div> </div> </div> </div> </div> <div class="footer"> <p> <acronym title="Copyright">©</acronym> 2017 The Qt Company Ltd. Documentation contributions included herein are the copyrights of their respective owners.<br> The documentation provided herein is licensed under the terms of the <a href="http://www.gnu.org/licenses/fdl.html">GNU Free Documentation License version 1.3</a> as published by the Free Software Foundation.<br> Qt and respective logos are trademarks of The Qt Company Ltd. in Finland and/or other countries worldwide. All other trademarks are property of their respective owners. </p> </div> </body> </html>