mrmBot-Matrix/natives/invert.cc

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#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;
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list <Image> mid;
readImages(&frames, in_path);
coalesceImages(&coalesced, frames.begin(), frames.end());
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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));
optimizeTransparency(mid.begin(), mid.end());
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if (type == "gif") {
for (Image &image : mid) {
image.quantizeDitherMethod(FloydSteinbergDitherMethod);
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, type;
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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.Has("delay") ? obj.Get("delay").As<Napi::Number>().Int32Value() : 0;
InvertWorker* invertWorker = new InvertWorker(cb, path, type, delay);
invertWorker->Queue();
return env.Undefined();
}