#include <napi.h> #include <list> #include <Magick++.h> using namespace std; using namespace Magick; class InvertWorker : public Napi::AsyncWorker { public: InvertWorker(Napi::Function& callback, string in_path, string type, int delay) : Napi::AsyncWorker(callback), in_path(in_path), type(type), delay(delay) {} ~InvertWorker() {} void Execute() { list <Image> frames; list <Image> coalesced; list <Image> mid; list <Image> result; readImages(&frames, in_path); coalesceImages(&coalesced, frames.begin(), frames.end()); for_each(coalesced.begin(), coalesced.end(), negateImage()); for (Image &image : coalesced) { image.negateChannel(Magick::AlphaChannel); mid.push_back(image); } // Magick::ChannelType(Magick::CompositeChannels ^ Magick::AlphaChannel) for_each(mid.begin(), mid.end(), magickImage(type)); optimizeImageLayers(&result, mid.begin(), mid.end()); if (delay != 0) for_each(result.begin(), result.end(), animationDelayImage(delay)); writeImages(result.begin(), result.end(), &blob); } void OnOK() { Callback().Call({Env().Undefined(), Napi::Buffer<char>::Copy(Env(), (char *)blob.data(), blob.length())}); } private: string in_path, type; int delay; Blob blob; }; Napi::Value Invert(const Napi::CallbackInfo &info) { Napi::Env env = info.Env(); Napi::Object obj = info[0].As<Napi::Object>(); Napi::Function cb = info[1].As<Napi::Function>(); string path = obj.Get("path").As<Napi::String>().Utf8Value(); string type = obj.Get("type").As<Napi::String>().Utf8Value(); int delay = obj.Get("delay").As<Napi::Number>().Int32Value(); InvertWorker* invertWorker = new InvertWorker(cb, path, type, delay); invertWorker->Queue(); return env.Undefined(); }