mrmBot-Matrix/natives/globe.cc

#include <Magick++.h>
#include <napi.h>

#include <list>

using namespace std;
using namespace Magick;

Napi::Value Globe(const Napi::CallbackInfo &info) {
  Napi::Env env = info.Env();

  Napi::Object obj = info[0].As<Napi::Object>();
  string path = obj.Get("path").As<Napi::String>().Utf8Value();
  string type = obj.Get("type").As<Napi::String>().Utf8Value();
  int delay =
      obj.Has("delay") ? obj.Get("delay").As<Napi::Number>().Int32Value() : 0;

  Blob blob;

  list<Image> frames;
  list<Image> coalesced;
  list<Image> mid;
  Image distort;
  Image overlay;
  readImages(&frames, path);
  distort.read("./assets/images/spheremap.png");
  overlay.read("./assets/images/sphere_overlay.png");
  coalesceImages(&coalesced, frames.begin(), frames.end());

  if (type != "gif") {
    list<Image>::iterator it = coalesced.begin();
    for (int i = 0; i < 29; ++i) {
      coalesced.push_back(*it);
    }
  }

  int i = 0;
  for (Image &image : coalesced) {
    image.scale(Geometry("500x500!"));
    image.alphaChannel(Magick::SetAlphaChannel);
    size_t width = image.columns();
    image.roll(Geometry("+" + to_string(width * i / coalesced.size())));
    image.composite(overlay, Magick::CenterGravity,
                    Magick::HardLightCompositeOp);
    image.composite(distort, Magick::CenterGravity, Magick::DistortCompositeOp);
    image.magick("GIF");
    mid.push_back(image);
    i++;
  }

  optimizeTransparency(mid.begin(), mid.end());
  if (delay != 0) {
    for_each(mid.begin(), mid.end(), animationDelayImage(delay));
  } else if (type != "gif") {
    for_each(mid.begin(), mid.end(), animationDelayImage(5));
  }

  for (Image &image : mid) {
    image.quantizeDitherMethod(FloydSteinbergDitherMethod);
    image.quantize();
  }

  writeImages(mid.begin(), mid.end(), &blob);

  Napi::Object result = Napi::Object::New(env);
  result.Set("data",
          Napi::Buffer<char>::Copy(env, (char *)blob.data(), blob.length()));
  result.Set("type", type);
  return result;
}