mrmBot-Matrix/natives/invert.cc

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#include <Magick++.h>
#include <napi.h>
#include <list>
using namespace std;
using namespace Magick;
Napi::Value Invert(const Napi::CallbackInfo &info) {
Napi::Env env = info.Env();
try {
Napi::Object obj = info[0].As<Napi::Object>();
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;
Blob blob;
list<Image> frames;
list<Image> coalesced;
list<Image> mid;
readImages(&frames, 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));
optimizeTransparency(mid.begin(), mid.end());
if (type == "gif") {
for (Image &image : mid) {
image.quantizeDitherMethod(FloydSteinbergDitherMethod);
image.quantize();
if (delay != 0) image.animationDelay(delay);
}
}
writeImages(mid.begin(), mid.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", type);
return result;
} catch (Napi::Error const &err) {
throw err;
} catch (std::exception const &err) {
throw Napi::Error::New(env, err.what());
} catch (...) {
throw Napi::Error::New(env, "Unknown error");
}
}