mrmBot-Matrix/natives/magik.cc

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

#include <iostream>
#include <list>

using namespace std;
using namespace Magick;

Napi::Value Magik(const Napi::CallbackInfo &info) {
  Napi::Env env = info.Env();
  Napi::Object result = Napi::Object::New(env);

  try {
    Napi::Object obj = info[1].As<Napi::Object>();
    Napi::Buffer<char> data = obj.Get("data").As<Napi::Buffer<char>>();
    string type = obj.Get("type").As<Napi::String>().Utf8Value();

    Blob blob;

    list<Image> frames;
    list<Image> coalesced;
    list<Image> blurred;
    try {
      readImages(&frames, Blob(data.Data(), data.Length()));
    } catch (Magick::WarningCoder &warning) {
      cerr << "Coder Warning: " << warning.what() << endl;
    } catch (Magick::Warning &warning) {
      cerr << "Warning: " << warning.what() << endl;
    }
    coalesceImages(&coalesced, frames.begin(), frames.end());

    for (Image &image : coalesced) {
      image.scale(Geometry("350x350"));
      image.liquidRescale(Geometry("175x175"));
      image.liquidRescale(Geometry("350x350"));
      image.magick(type);
      blurred.push_back(image);
    }

    optimizeTransparency(blurred.begin(), blurred.end());

    if (type == "gif") {
      for (Image &image : blurred) {
        image.quantizeDitherMethod(FloydSteinbergDitherMethod);
        image.quantize();
      }
    }

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

    result.Set("data", Napi::Buffer<char>::Copy(env, (char *)blob.data(),
                                                blob.length()));
    result.Set("type", type);
  } catch (std::exception const &err) {
    Napi::Error::New(env, err.what()).ThrowAsJavaScriptException();
  } catch (...) {
    Napi::Error::New(env, "Unknown error").ThrowAsJavaScriptException();
  }

  return result;
}