mrmBot-Matrix/natives/reverse.cc

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#include <Magick++.h>
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#include <napi.h>
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#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();
copy.pop_back();
copy.pop_front();
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");
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}
}