mrmBot-Matrix/natives/flag.cc

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#include <napi.h>
#include <list>
#include <Magick++.h>
using namespace std;
using namespace Magick;
class FlagWorker : public Napi::AsyncWorker {
public:
FlagWorker(Napi::Function& callback, string in_path, string overlay_path, string type, int delay)
: Napi::AsyncWorker(callback), in_path(in_path), overlay_path(overlay_path), type(type), delay(delay) {}
~FlagWorker() {}
void Execute() {
list <Image> frames;
list <Image> coalesced;
list <Image> mid;
Image watermark;
readImages(&frames, in_path);
watermark.read(overlay_path);
watermark.alphaChannel(Magick::SetAlphaChannel);
watermark.evaluate(Magick::AlphaChannel, Magick::MultiplyEvaluateOperator, 0.5);
string query(to_string(frames.front().baseColumns()) + "x" + to_string(frames.front().baseRows()) + "!");
watermark.scale(Geometry(query));
coalesceImages(&coalesced, frames.begin(), frames.end());
for (Image &image : coalesced) {
image.composite(watermark, Magick::NorthGravity, Magick::OverCompositeOp);
image.magick(type);
mid.push_back(image);
}
optimizeTransparency(mid.begin(), mid.end());
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if (type == "gif") {
for (Image &image : mid) {
image.quantizeDither(false);
image.quantize();
if (delay != 0) image.animationDelay(delay);
}
}
writeImages(mid.begin(), mid.end(), &blob);
}
void OnOK() {
Callback().Call({Env().Undefined(), Napi::Buffer<char>::Copy(Env(), (char *)blob.data(), blob.length()), Napi::String::From(Env(), type)});
}
private:
string in_path, overlay_path, type;
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int delay;
Blob blob;
};
Napi::Value Flag(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 overlay = obj.Get("overlay").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;
FlagWorker* flagWorker = new FlagWorker(cb, path, overlay, type, delay);
flagWorker->Queue();
return env.Undefined();
}