void VideoFrameTransform::generateKernelsAndFilteringConfigs()

in Transform360/Library/VideoFrameTransform.cpp [340:386]

• 36 lines of code
• 3 McCabe index (conditional complexity)

void VideoFrameTransform::generateKernelsAndFilteringConfigs(
    int startTop,
    int startBottom,
    float sigmaY,
    const Mat& kernelY,
    int baseSegmentHeight,
    int inputWidth,
    int inputHeight,
    int transformMatPlaneIndex) {
  // Top half
  // "bottom" is used to calculate the position of a vertical segment
  for (int bottom = startBottom; bottom >= 0; bottom -= baseSegmentHeight) {
    int top = max(bottom - baseSegmentHeight + 1, 0);
    // Here, both "top" and "bottom" are small than 0.5 * inputHeight.
    // The "angle", or "distance" of the center, of the segment to equator is
    // equal to 0.5 * inputHeight - 0.5 * (top + bottom)
    float angle  = 0.5 * M_PI * (inputHeight - top - bottom) / inputHeight;
    generateKernelAndFilteringConfig(
      top,
      bottom,
      angle,
      sigmaY,
      kernelY,
      inputWidth,
      inputHeight,
      transformMatPlaneIndex);
  }

  // Bottom half
  // "top" is used to calculate the position of a vertical segment
  for (int top = startTop; top < inputHeight; top += baseSegmentHeight) {
    int bottom = min(top + baseSegmentHeight - 1, inputHeight - 1);
    // Here, both "top" and "bottom" are larger than or equal to
    // 0.5 * inputHeight. The "angle" of the segment is equal to
    // 0.5 * (top + bottom) - 0.5 * inputHeight
    float angle = 0.5 * M_PI * (top + bottom - inputHeight) / inputHeight;
    generateKernelAndFilteringConfig(
      top,
      bottom,
      angle,
      sigmaY,
      kernelY,
      inputWidth,
      inputHeight,
      transformMatPlaneIndex);
  }
}