1 files changed, 122 insertions, 0 deletions
diff --git a/examples/widgets/tools/plugandpaintplugins/extrafilters/extrafiltersplugin.cpp b/examples/widgets/tools/plugandpaintplugins/extrafilters/extrafiltersplugin.cpp
new file mode 100644
index 0000000000..297f164428
--- /dev/null
+++ b/examples/widgets/tools/plugandpaintplugins/extrafilters/extrafiltersplugin.cpp
@@ -0,0 +1,122 @@
+/****************************************************************************
+**
+** Copyright (C) 2012 Digia Plc and/or its subsidiary(-ies).
+** Contact: http://www.qt-project.org/legal
+**
+** 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:
+**
+** "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 Digia Plc and its Subsidiary(-ies) 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."
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include <QtWidgets>
+
+#include <math.h>
+#include <stdlib.h>
+
+#include "extrafiltersplugin.h"
+
+QStringList ExtraFiltersPlugin::filters() const
+{
+    return QStringList() << tr("Flip Horizontally") << tr("Flip Vertically")
+                         << tr("Smudge...") << tr("Threshold...");
+}
+
+QImage ExtraFiltersPlugin::filterImage(const QString &filter,
+                                       const QImage &image, QWidget *parent)
+{
+    QImage original = image.convertToFormat(QImage::Format_RGB32);
+    QImage result = original;
+
+    if (filter == tr("Flip Horizontally")) {
+        for (int y = 0; y < original.height(); ++y) {
+            for (int x = 0; x < original.width(); ++x) {
+                int pixel = original.pixel(original.width() - x - 1, y);
+                result.setPixel(x, y, pixel);
+            }
+        }
+    } else if (filter == tr("Flip Vertically")) {
+        for (int y = 0; y < original.height(); ++y) {
+            for (int x = 0; x < original.width(); ++x) {
+                int pixel = original.pixel(x, original.height() - y - 1);
+                result.setPixel(x, y, pixel);
+            }
+        }
+    } else if (filter == tr("Smudge...")) {
+        bool ok;
+        int numIters = QInputDialog::getInt(parent, tr("Smudge Filter"),
+                                    tr("Enter number of iterations:"),
+                                    5, 1, 20, 1, &ok);
+        if (ok) {
+            for (int i = 0; i < numIters; ++i) {
+                for (int y = 1; y < original.height() - 1; ++y) {
+                    for (int x = 1; x < original.width() - 1; ++x) {
+                        int p1 = original.pixel(x, y);
+                        int p2 = original.pixel(x, y + 1);
+                        int p3 = original.pixel(x, y - 1);
+                        int p4 = original.pixel(x + 1, y);
+                        int p5 = original.pixel(x - 1, y);
+
+                        int red = (qRed(p1) + qRed(p2) + qRed(p3) + qRed(p4)
+                                   + qRed(p5)) / 5;
+                        int green = (qGreen(p1) + qGreen(p2) + qGreen(p3)
+                                     + qGreen(p4) + qGreen(p5)) / 5;
+                        int blue = (qBlue(p1) + qBlue(p2) + qBlue(p3)
+                                    + qBlue(p4) + qBlue(p5)) / 5;
+                        int alpha = (qAlpha(p1) + qAlpha(p2) + qAlpha(p3)
+                                     + qAlpha(p4) + qAlpha(p5)) / 5;
+
+                        result.setPixel(x, y, qRgba(red, green, blue, alpha));
+                    }
+                }
+            }
+        }
+    } else if (filter == tr("Threshold...")) {
+        bool ok;
+        int threshold = QInputDialog::getInt(parent, tr("Threshold Filter"),
+                                                 tr("Enter threshold:"),
+                                                 10, 1, 256, 1, &ok);
+        if (ok) {
+            int factor = 256 / threshold;
+            for (int y = 0; y < original.height(); ++y) {
+                for (int x = 0; x < original.width(); ++x) {
+                    int pixel = original.pixel(x, y);
+                    result.setPixel(x, y, qRgba(qRed(pixel) / factor * factor,
+                                                qGreen(pixel) / factor * factor,
+                                                qBlue(pixel) / factor * factor,
+                                                qAlpha(pixel)));
+                }
+            }
+        }
+    }
+    return result;
+}