mrmBot-Matrix/natives/trump.cc

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

#include <list>

using namespace std;
using namespace Magick;

Napi::Value Trump(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 watermark;
  readImages(&frames, path);
  watermark.read("./assets/images/trump.png");
  coalesceImages(&coalesced, frames.begin(), frames.end());

  for (Image &image : coalesced) {
    Image watermark_new = watermark;
    image.virtualPixelMethod(Magick::TransparentVirtualPixelMethod);
    image.backgroundColor("none");
    image.scale(Geometry("365x179!"));
    double arguments[16] = {0,   0,   207, 268, 365, 0,   548, 271,
                            365, 179, 558, 450, 0,   179, 193, 450};
    image.distort(Magick::PerspectiveDistortion, 16, arguments, true);
    image.extent(Geometry("800x450"), Magick::CenterGravity);
    watermark_new.composite(image, Geometry("-25+134"),
                            Magick::DstOverCompositeOp);
    watermark_new.magick(type);
    watermark_new.animationDelay(delay == 0 ? image.animationDelay() : delay);
    mid.push_back(watermark_new);
  }

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

  if (type == "gif") {
    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;
}