body_color_collector.cpp

NVGcolor getModuleBodyColor(NSVGimage* svgHandle) {
  // educated guess as to what a reasonable minimum area should be,
  // based on testing a bunch of different modules
  float largestArea{11000.f};

  // default in case we can't find anything reasonable
  NVGcolor bodyColor = nvgRGBA(255, 255, 255, 255);

  for (NSVGshape* shape = svgHandle->shapes; shape; shape = shape->next) {
    // skip invisible shapes
    if (!(shape->flags & NSVG_FLAGS_VISIBLE)) continue;

    // "Tight bounding box of the shape [minx,miny,maxx,maxy]."
    float area =
      (shape->bounds[2] - shape->bounds[0]) * (shape->bounds[3] - shape->bounds[1]);

    // skip if this shape is smaller than the largest so far
    if (area < largestArea) continue;

    unsigned int color;
    switch (shape->fill.type) {
      case NSVG_PAINT_COLOR:
        color = shape->fill.color;
        break;
      case NSVG_PAINT_LINEAR_GRADIENT:
      case NSVG_PAINT_RADIAL_GRADIENT:
        color = shape->fill.gradient->stops[0].color;
        break;
      default:
        continue;
    }

    // skip transparent colors
    if (((color >> 24) & 0xff) < 255) continue;

    largestArea = area;
    bodyColor = nvgRGBA(
      (color >> 0) & 0xff,
      (color >> 8) & 0xff,
      (color >> 16) & 0xff,
      (color >> 24) & 0xff
    );
  }

  return bodyColor;
}