#include #include #include #include using namespace std; using namespace Magick; Napi::Value Caption(const Napi::CallbackInfo &info) { Napi::Env env = info.Env(); try { Napi::Object obj = info[0].As(); Napi::Buffer data = obj.Get("data").As>(); string caption = obj.Get("caption").As().Utf8Value(); string font = obj.Get("font").As().Utf8Value(); string type = obj.Get("type").As().Utf8Value(); int delay = obj.Has("delay") ? obj.Get("delay").As().Int32Value() : 0; Blob blob; list frames; list coalesced; list captioned; 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; } size_t width = frames.front().baseColumns(); string query(to_string(width - ((width / 25) * 2)) + "x"); Image caption_image(Geometry(query), Color("white")); caption_image.fillColor("black"); caption_image.alpha(true); caption_image.fontPointsize((double)width / 13); caption_image.textGravity(Magick::CenterGravity); caption_image.read("pango:" + caption + ""); caption_image.extent(Geometry(width, caption_image.rows() + (width / 13)), Magick::CenterGravity); coalesceImages(&coalesced, frames.begin(), frames.end()); for (Image &image : coalesced) { Image appended; list images; image.backgroundColor("white"); images.push_back(caption_image); images.push_back(image); appendImages(&appended, images.begin(), images.end(), true); appended.repage(); appended.magick(type); appended.animationDelay(delay == 0 ? image.animationDelay() : delay); appended.gifDisposeMethod(Magick::BackgroundDispose); captioned.push_back(appended); } optimizeTransparency(captioned.begin(), captioned.end()); if (type == "gif") { for (Image &image : captioned) { image.quantizeDither(false); image.quantize(); } } writeImages(captioned.begin(), captioned.end(), &blob); Napi::Object result = Napi::Object::New(env); result.Set("data", Napi::Buffer::Copy(env, (char *)blob.data(), blob.length())); result.Set("type", type); return result; } catch (std::exception const &err) { throw Napi::Error::New(env, err.what()); } catch (...) { throw Napi::Error::New(env, "Unknown error"); } }