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<h1 class="title">extrafiltersplugin.cpp Example File</h1>
<span class="subtitle">tools/plugandpaint/plugins/extrafilters/extrafiltersplugin.cpp</span>
<!-- $$$tools/plugandpaint/plugins/extrafilters/extrafiltersplugin.cpp-description -->
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<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
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** * Redistributions in binary form must reproduce the above copyright
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** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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****************************************************************************/</span>
<span class="preprocessor">#include <QtWidgets></span>
<span class="preprocessor">#include <math.h></span>
<span class="preprocessor">#include <stdlib.h></span>
<span class="preprocessor">#include "extrafiltersplugin.h"</span>
<span class="type"><a href="../qtcore/qstringlist.html">QStringList</a></span> ExtraFiltersPlugin<span class="operator">::</span>filters() <span class="keyword">const</span>
{
<span class="keyword">return</span> <span class="type"><a href="../qtcore/qstringlist.html">QStringList</a></span>() <span class="operator"><</span><span class="operator"><</span> tr(<span class="string">"Flip Horizontally"</span>) <span class="operator"><</span><span class="operator"><</span> tr(<span class="string">"Flip Vertically"</span>)
<span class="operator"><</span><span class="operator"><</span> tr(<span class="string">"Smudge..."</span>) <span class="operator"><</span><span class="operator"><</span> tr(<span class="string">"Threshold..."</span>);
}
<span class="type"><a href="../qtgui/qimage.html">QImage</a></span> ExtraFiltersPlugin<span class="operator">::</span>filterImage(<span class="keyword">const</span> <span class="type"><a href="../qtcore/qstring.html">QString</a></span> <span class="operator">&</span>filter<span class="operator">,</span>
<span class="keyword">const</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="qwidget.html">QWidget</a></span> <span class="operator">*</span>parent)
{
<span class="type"><a href="../qtgui/qimage.html">QImage</a></span> original <span class="operator">=</span> image<span class="operator">.</span>convertToFormat(<span class="type"><a href="../qtgui/qimage.html">QImage</a></span><span class="operator">::</span>Format_RGB32);
<span class="type"><a href="../qtgui/qimage.html">QImage</a></span> result <span class="operator">=</span> original;
<span class="keyword">if</span> (filter <span class="operator">=</span><span class="operator">=</span> tr(<span class="string">"Flip Horizontally"</span>)) {
<span class="keyword">for</span> (<span class="type">int</span> y <span class="operator">=</span> <span class="number">0</span>; y <span class="operator"><</span> original<span class="operator">.</span>height(); <span class="operator">+</span><span class="operator">+</span>y) {
<span class="keyword">for</span> (<span class="type">int</span> x <span class="operator">=</span> <span class="number">0</span>; x <span class="operator"><</span> original<span class="operator">.</span>width(); <span class="operator">+</span><span class="operator">+</span>x) {
<span class="type">int</span> pixel <span class="operator">=</span> original<span class="operator">.</span>pixel(original<span class="operator">.</span>width() <span class="operator">-</span> x <span class="operator">-</span> <span class="number">1</span><span class="operator">,</span> y);
result<span class="operator">.</span>setPixel(x<span class="operator">,</span> y<span class="operator">,</span> pixel);
}
}
} <span class="keyword">else</span> <span class="keyword">if</span> (filter <span class="operator">=</span><span class="operator">=</span> tr(<span class="string">"Flip Vertically"</span>)) {
<span class="keyword">for</span> (<span class="type">int</span> y <span class="operator">=</span> <span class="number">0</span>; y <span class="operator"><</span> original<span class="operator">.</span>height(); <span class="operator">+</span><span class="operator">+</span>y) {
<span class="keyword">for</span> (<span class="type">int</span> x <span class="operator">=</span> <span class="number">0</span>; x <span class="operator"><</span> original<span class="operator">.</span>width(); <span class="operator">+</span><span class="operator">+</span>x) {
<span class="type">int</span> pixel <span class="operator">=</span> original<span class="operator">.</span>pixel(x<span class="operator">,</span> original<span class="operator">.</span>height() <span class="operator">-</span> y <span class="operator">-</span> <span class="number">1</span>);
result<span class="operator">.</span>setPixel(x<span class="operator">,</span> y<span class="operator">,</span> pixel);
}
}
} <span class="keyword">else</span> <span class="keyword">if</span> (filter <span class="operator">=</span><span class="operator">=</span> tr(<span class="string">"Smudge..."</span>)) {
bool ok;
<span class="type">int</span> numIters <span class="operator">=</span> <span class="type"><a href="qinputdialog.html">QInputDialog</a></span><span class="operator">::</span>getInt(parent<span class="operator">,</span> tr(<span class="string">"Smudge Filter"</span>)<span class="operator">,</span>
tr(<span class="string">"Enter number of iterations:"</span>)<span class="operator">,</span>
<span class="number">5</span><span class="operator">,</span> <span class="number">1</span><span class="operator">,</span> <span class="number">20</span><span class="operator">,</span> <span class="number">1</span><span class="operator">,</span> <span class="operator">&</span>ok);
<span class="keyword">if</span> (ok) {
<span class="keyword">for</span> (<span class="type">int</span> i <span class="operator">=</span> <span class="number">0</span>; i <span class="operator"><</span> numIters; <span class="operator">+</span><span class="operator">+</span>i) {
<span class="keyword">for</span> (<span class="type">int</span> y <span class="operator">=</span> <span class="number">1</span>; y <span class="operator"><</span> original<span class="operator">.</span>height() <span class="operator">-</span> <span class="number">1</span>; <span class="operator">+</span><span class="operator">+</span>y) {
<span class="keyword">for</span> (<span class="type">int</span> x <span class="operator">=</span> <span class="number">1</span>; x <span class="operator"><</span> original<span class="operator">.</span>width() <span class="operator">-</span> <span class="number">1</span>; <span class="operator">+</span><span class="operator">+</span>x) {
<span class="type">int</span> p1 <span class="operator">=</span> original<span class="operator">.</span>pixel(x<span class="operator">,</span> y);
<span class="type">int</span> p2 <span class="operator">=</span> original<span class="operator">.</span>pixel(x<span class="operator">,</span> y <span class="operator">+</span> <span class="number">1</span>);
<span class="type">int</span> p3 <span class="operator">=</span> original<span class="operator">.</span>pixel(x<span class="operator">,</span> y <span class="operator">-</span> <span class="number">1</span>);
<span class="type">int</span> p4 <span class="operator">=</span> original<span class="operator">.</span>pixel(x <span class="operator">+</span> <span class="number">1</span><span class="operator">,</span> y);
<span class="type">int</span> p5 <span class="operator">=</span> original<span class="operator">.</span>pixel(x <span class="operator">-</span> <span class="number">1</span><span class="operator">,</span> y);
<span class="type">int</span> red <span class="operator">=</span> (<a href="../qtgui/qcolor.html#qRed">qRed</a>(p1) <span class="operator">+</span> <a href="../qtgui/qcolor.html#qRed">qRed</a>(p2) <span class="operator">+</span> <a href="../qtgui/qcolor.html#qRed">qRed</a>(p3) <span class="operator">+</span> <a href="../qtgui/qcolor.html#qRed">qRed</a>(p4)
<span class="operator">+</span> <a href="../qtgui/qcolor.html#qRed">qRed</a>(p5)) <span class="operator">/</span> <span class="number">5</span>;
<span class="type">int</span> green <span class="operator">=</span> (<a href="../qtgui/qcolor.html#qGreen">qGreen</a>(p1) <span class="operator">+</span> <a href="../qtgui/qcolor.html#qGreen">qGreen</a>(p2) <span class="operator">+</span> <a href="../qtgui/qcolor.html#qGreen">qGreen</a>(p3)
<span class="operator">+</span> <a href="../qtgui/qcolor.html#qGreen">qGreen</a>(p4) <span class="operator">+</span> <a href="../qtgui/qcolor.html#qGreen">qGreen</a>(p5)) <span class="operator">/</span> <span class="number">5</span>;
<span class="type">int</span> blue <span class="operator">=</span> (<a href="../qtgui/qcolor.html#qBlue">qBlue</a>(p1) <span class="operator">+</span> <a href="../qtgui/qcolor.html#qBlue">qBlue</a>(p2) <span class="operator">+</span> <a href="../qtgui/qcolor.html#qBlue">qBlue</a>(p3)
<span class="operator">+</span> <a href="../qtgui/qcolor.html#qBlue">qBlue</a>(p4) <span class="operator">+</span> <a href="../qtgui/qcolor.html#qBlue">qBlue</a>(p5)) <span class="operator">/</span> <span class="number">5</span>;
<span class="type">int</span> alpha <span class="operator">=</span> (<a href="../qtgui/qcolor.html#qAlpha">qAlpha</a>(p1) <span class="operator">+</span> <a href="../qtgui/qcolor.html#qAlpha">qAlpha</a>(p2) <span class="operator">+</span> <a href="../qtgui/qcolor.html#qAlpha">qAlpha</a>(p3)
<span class="operator">+</span> <a href="../qtgui/qcolor.html#qAlpha">qAlpha</a>(p4) <span class="operator">+</span> <a href="../qtgui/qcolor.html#qAlpha">qAlpha</a>(p5)) <span class="operator">/</span> <span class="number">5</span>;
result<span class="operator">.</span>setPixel(x<span class="operator">,</span> y<span class="operator">,</span> <a href="../qtgui/qcolor.html#qRgba">qRgba</a>(red<span class="operator">,</span> green<span class="operator">,</span> blue<span class="operator">,</span> alpha));
}
}
}
}
} <span class="keyword">else</span> <span class="keyword">if</span> (filter <span class="operator">=</span><span class="operator">=</span> tr(<span class="string">"Threshold..."</span>)) {
bool ok;
<span class="type">int</span> threshold <span class="operator">=</span> <span class="type"><a href="qinputdialog.html">QInputDialog</a></span><span class="operator">::</span>getInt(parent<span class="operator">,</span> tr(<span class="string">"Threshold Filter"</span>)<span class="operator">,</span>
tr(<span class="string">"Enter threshold:"</span>)<span class="operator">,</span>
<span class="number">10</span><span class="operator">,</span> <span class="number">1</span><span class="operator">,</span> <span class="number">256</span><span class="operator">,</span> <span class="number">1</span><span class="operator">,</span> <span class="operator">&</span>ok);
<span class="keyword">if</span> (ok) {
<span class="type">int</span> factor <span class="operator">=</span> <span class="number">256</span> <span class="operator">/</span> threshold;
<span class="keyword">for</span> (<span class="type">int</span> y <span class="operator">=</span> <span class="number">0</span>; y <span class="operator"><</span> original<span class="operator">.</span>height(); <span class="operator">+</span><span class="operator">+</span>y) {
<span class="keyword">for</span> (<span class="type">int</span> x <span class="operator">=</span> <span class="number">0</span>; x <span class="operator"><</span> original<span class="operator">.</span>width(); <span class="operator">+</span><span class="operator">+</span>x) {
<span class="type">int</span> pixel <span class="operator">=</span> original<span class="operator">.</span>pixel(x<span class="operator">,</span> y);
result<span class="operator">.</span>setPixel(x<span class="operator">,</span> y<span class="operator">,</span> <a href="../qtgui/qcolor.html#qRgba">qRgba</a>(<a href="../qtgui/qcolor.html#qRed">qRed</a>(pixel) <span class="operator">/</span> factor <span class="operator">*</span> factor<span class="operator">,</span>
<a href="../qtgui/qcolor.html#qGreen">qGreen</a>(pixel) <span class="operator">/</span> factor <span class="operator">*</span> factor<span class="operator">,</span>
<a href="../qtgui/qcolor.html#qBlue">qBlue</a>(pixel) <span class="operator">/</span> factor <span class="operator">*</span> factor<span class="operator">,</span>
<a href="../qtgui/qcolor.html#qAlpha">qAlpha</a>(pixel)));
}
}
}
}
<span class="keyword">return</span> result;
}
</pre>
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