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| |
| #include "renderthread.h" |
| |
| #include <QImage> |
| #include <cmath> |
| |
| //! [0] |
| RenderThread::RenderThread(QObject *parent) |
| : QThread(parent) |
| { |
| restart = false; |
| abort = false; |
| |
| for (int i = 0; i < ColormapSize; ++i) |
| colormap[i] = rgbFromWaveLength(380.0 + (i * 400.0 / ColormapSize)); |
| } |
| //! [0] |
| |
| //! [1] |
| RenderThread::~RenderThread() |
| { |
| mutex.lock(); |
| abort = true; |
| condition.wakeOne(); |
| mutex.unlock(); |
| |
| wait(); |
| } |
| //! [1] |
| |
| //! [2] |
| void RenderThread::render(double centerX, double centerY, double scaleFactor, |
| QSize resultSize) |
| { |
| QMutexLocker locker(&mutex); |
| |
| this->centerX = centerX; |
| this->centerY = centerY; |
| this->scaleFactor = scaleFactor; |
| this->resultSize = resultSize; |
| |
| if (!isRunning()) { |
| start(LowPriority); |
| } else { |
| restart = true; |
| condition.wakeOne(); |
| } |
| } |
| //! [2] |
| |
| //! [3] |
| void RenderThread::run() |
| { |
| forever { |
| mutex.lock(); |
| QSize resultSize = this->resultSize; |
| double scaleFactor = this->scaleFactor; |
| double centerX = this->centerX; |
| double centerY = this->centerY; |
| mutex.unlock(); |
| //! [3] |
| |
| //! [4] |
| int halfWidth = resultSize.width() / 2; |
| //! [4] //! [5] |
| int halfHeight = resultSize.height() / 2; |
| QImage image(resultSize, QImage::Format_RGB32); |
| |
| 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 (restart) |
| break; |
| if (abort) |
| return; |
| |
| uint *scanLine = |
| reinterpret_cast<uint *>(image.scanLine(y + halfHeight)); |
| double ay = centerY + (y * scaleFactor); |
| |
| for (int x = -halfWidth; x < halfWidth; ++x) { |
| double ax = centerX + (x * scaleFactor); |
| double a1 = ax; |
| double b1 = ay; |
| int numIterations = 0; |
| |
| do { |
| ++numIterations; |
| double a2 = (a1 * a1) - (b1 * b1) + ax; |
| 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++ = colormap[numIterations % ColormapSize]; |
| allBlack = false; |
| } else { |
| *scanLine++ = qRgb(0, 0, 0); |
| } |
| } |
| } |
| |
| if (allBlack && pass == 0) { |
| pass = 4; |
| } else { |
| if (!restart) |
| emit renderedImage(image, scaleFactor); |
| //! [5] //! [6] |
| ++pass; |
| } |
| //! [6] //! [7] |
| } |
| //! [7] |
| |
| //! [8] |
| mutex.lock(); |
| //! [8] //! [9] |
| if (!restart) |
| condition.wait(&mutex); |
| restart = false; |
| mutex.unlock(); |
| } |
| } |
| //! [9] |
| |
| //! [10] |
| uint RenderThread::rgbFromWaveLength(double wave) |
| { |
| double r = 0.0; |
| double g = 0.0; |
| double b = 0.0; |
| |
| 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)); |
| } |
| //! [10] |