mrmBot-Matrix/natives/reverse.cc

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

#include <list>

using namespace std;
using namespace Magick;

Napi::Value Reverse(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();
  bool soos =
      obj.Has("soos") ? obj.Get("soos").As<Napi::Boolean>().Value() : false;
  int delay =
      obj.Has("delay") ? obj.Get("delay").As<Napi::Number>().Int32Value() : 0;

  Blob blob;

  list<Image> frames;
  list<Image> coalesced;
  readImages(&frames, path);
  coalesceImages(&coalesced, frames.begin(), frames.end());

  if (soos) {
    list<Image> copy = coalesced;
    copy.reverse();
    coalesced.insert(coalesced.end(), copy.begin(), copy.end());
  } else {
    coalesced.reverse();
  }

  for_each(coalesced.begin(), coalesced.end(), magickImage("GIF"));

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

  for (Image &image : coalesced) {
    image.quantizeDither(false);
    image.quantize();
    if (delay != 0) image.animationDelay(delay);
  }

  writeImages(coalesced.begin(), coalesced.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", "gif");
  return result;
}