#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(); try { Napi::Object obj = info[0].As<Napi::Object>(); Napi::Buffer<char> data = obj.Get("data").As<Napi::Buffer<char>>(); 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, Blob(data.Data(), data.Length())); 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; } catch (std::exception const &err) { throw Napi::Error::New(env, err.what()); } catch (...) { throw Napi::Error::New(env, "Unknown error"); } }