mrmBot-Matrix/natives/mirror.cc

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#include <Magick++.h>
#include <napi.h>
#include <list>
using namespace std;
using namespace Magick;
Napi::Value Mirror(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 vertical = obj.Has("vertical")
? obj.Get("vertical").As<Napi::Boolean>().Value()
: false;
bool first =
obj.Has("first") ? obj.Get("first").As<Napi::Boolean>().Value() : false;
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;
MagickCore::GravityType gravity;
readImages(&frames, Blob(data.Data(), data.Length()));
coalesceImages(&coalesced, frames.begin(), frames.end());
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if (vertical && first) {
gravity = Magick::NorthGravity;
} else if (!vertical && first) {
gravity = Magick::WestGravity;
} else if (vertical && !first) {
gravity = Magick::SouthGravity;
} else {
gravity = Magick::EastGravity;
}
for (Image &image : coalesced) {
list<Image> mirrored;
Image final;
image.extent(Geometry(to_string(vertical ? image.baseColumns()
: image.baseColumns() / 2) +
"x" +
to_string(vertical ? image.baseRows() / 2
: image.baseRows())),
gravity);
mirrored.push_back(image);
Image mirror = image;
if (vertical) {
mirror.flip();
} else {
mirror.flop();
}
if (first) {
mirrored.push_back(mirror);
} else {
mirrored.push_front(mirror);
}
appendImages(&final, mirrored.begin(), mirrored.end(), vertical);
final.repage();
final.magick(type);
final.animationDelay(delay == 0 ? image.animationDelay() : delay);
mid.push_back(final);
}
optimizeTransparency(mid.begin(), mid.end());
if (type == "gif") {
for (Image &image : mid) {
image.quantizeDither(false);
image.quantize();
}
}
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 (std::exception const &err) {
throw Napi::Error::New(env, err.what());
} catch (...) {
throw Napi::Error::New(env, "Unknown error");
}
}