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| -rw-r--r-- | static/source/qt5-mandelbrot/renderthread.cxx | 232 |
1 files changed, 232 insertions, 0 deletions
diff --git a/static/source/qt5-mandelbrot/renderthread.cxx b/static/source/qt5-mandelbrot/renderthread.cxx new file mode 100644 index 000000000..398e43ded --- /dev/null +++ b/static/source/qt5-mandelbrot/renderthread.cxx @@ -0,0 +1,232 @@ +/**************************************************************************** +** +** 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." +** +** $QT_END_LICENSE$ +** +****************************************************************************/ + +#include "renderthread.h" +#include "renderthread.moc" + +#include <QtGui/QImage> +#include <cmath> + +RenderThread::RenderThread(QObject* parent) + : QThread(parent) +{ + for (int i = 0; i < ColormapSize; ++i) + m_colormap[i] = rgbFromWaveLength(380.0 + (i * 400.0 / ColormapSize)); +} + +RenderThread::~RenderThread() +{ + m_mutex.lock(); + m_abort = true; + m_condition.wakeOne(); + m_mutex.unlock(); + + wait(); +} + +void RenderThread::render(double centerX, double centerY, double scaleFactor, QSize resultSize, + double devicePixelRatio) +{ + QMutexLocker locker(&m_mutex); + + m_centerX = centerX; + m_centerY = centerY; + m_scaleFactor = scaleFactor; + m_devicePixelRatio = devicePixelRatio; + m_resultSize = resultSize; + + if (!isRunning()) + { + start(LowPriority); + } + else + { + m_restart = true; + m_condition.wakeOne(); + } +} + +void RenderThread::run() +{ + forever + { + m_mutex.lock(); + const double devicePixelRatio = m_devicePixelRatio; + const QSize resultSize = m_resultSize * devicePixelRatio; + const double requestedScaleFactor = m_scaleFactor; + const double scaleFactor = requestedScaleFactor / devicePixelRatio; + const double centerX = m_centerX; + const double centerY = m_centerY; + m_mutex.unlock(); + + int halfWidth = resultSize.width() / 2; + int halfHeight = resultSize.height() / 2; + QImage image(resultSize, QImage::Format_RGB32); + image.setDevicePixelRatio(devicePixelRatio); + + const int NumPasses = 8; + int pass = 0; + while (pass < NumPasses) + { + const int MaxIterations = (1 << (2 * pass + 6)) + 32; + const int Limit = 4; + bool allBlack = true; + + for (int y = -halfHeight; y < halfHeight; ++y) + { + if (m_restart) + break; + if (m_abort) + return; + + auto scanLine = reinterpret_cast<uint*>(image.scanLine(y + halfHeight)); + const double ay = centerY + (y * scaleFactor); + + for (int x = -halfWidth; x < halfWidth; ++x) + { + const double ax = centerX + (x * scaleFactor); + double a1 = ax; + double b1 = ay; + int numIterations = 0; + + do + { + ++numIterations; + const double a2 = (a1 * a1) - (b1 * b1) + ax; + const double b2 = (2 * a1 * b1) + ay; + if ((a2 * a2) + (b2 * b2) > Limit) + break; + + ++numIterations; + a1 = (a2 * a2) - (b2 * b2) + ax; + b1 = (2 * a2 * b2) + ay; + if ((a1 * a1) + (b1 * b1) > Limit) + break; + } while (numIterations < MaxIterations); + + if (numIterations < MaxIterations) + { + *scanLine++ = m_colormap[numIterations % ColormapSize]; + allBlack = false; + } + else + { + *scanLine++ = qRgb(0, 0, 0); + } + } + } + + if (allBlack && pass == 0) + { + pass = 4; + } + else + { + if (!m_restart) + emit renderedImage(image, requestedScaleFactor); + ++pass; + } + } + + m_mutex.lock(); + if (!m_restart) + m_condition.wait(&m_mutex); + m_restart = false; + m_mutex.unlock(); + } +} + +uint RenderThread::rgbFromWaveLength(double wave) +{ + double r = 0; + double g = 0; + double b = 0; + + if (wave >= 380.0 && wave <= 440.0) + { + r = -1.0 * (wave - 440.0) / (440.0 - 380.0); + b = 1.0; + } + else if (wave >= 440.0 && wave <= 490.0) + { + g = (wave - 440.0) / (490.0 - 440.0); + b = 1.0; + } + else if (wave >= 490.0 && wave <= 510.0) + { + g = 1.0; + b = -1.0 * (wave - 510.0) / (510.0 - 490.0); + } + else if (wave >= 510.0 && wave <= 580.0) + { + r = (wave - 510.0) / (580.0 - 510.0); + g = 1.0; + } + else if (wave >= 580.0 && wave <= 645.0) + { + r = 1.0; + g = -1.0 * (wave - 645.0) / (645.0 - 580.0); + } + else if (wave >= 645.0 && wave <= 780.0) + { + r = 1.0; + } + + double s = 1.0; + if (wave > 700.0) + s = 0.3 + 0.7 * (780.0 - wave) / (780.0 - 700.0); + else if (wave < 420.0) + s = 0.3 + 0.7 * (wave - 380.0) / (420.0 - 380.0); + + r = std::pow(r * s, 0.8); + g = std::pow(g * s, 0.8); + b = std::pow(b * s, 0.8); + return qRgb(int(r * 255), int(g * 255), int(b * 255)); +} |