mrmBot-Matrix/natives/watermark.cc

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#include <Magick++.h>
#include <napi.h>
#include <iostream>
#include <list>
using namespace std;
using namespace Magick;
Napi::Value Watermark(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>>();
string water = obj.Get("water").As<Napi::String>().Utf8Value();
int gravity = obj.Get("gravity").As<Napi::Number>().Int32Value();
bool resize = obj.Has("resize")
? obj.Get("resize").As<Napi::Boolean>().Value()
: false;
bool append = obj.Has("append")
? obj.Get("append").As<Napi::Boolean>().Value()
: false;
bool mc = obj.Has("mc") ? obj.Get("mc").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;
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Blob blob;
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list<Image> frames;
list<Image> coalesced;
list<Image> mid;
Image watermark;
readImages(&frames, Blob(data.Data(), data.Length()));
watermark.read(water);
if (resize && append) {
string query(to_string(frames.front().baseColumns()) + "x");
watermark.scale(Geometry(query));
} else if (resize) {
string query("x" + to_string(frames.front().baseRows()));
watermark.scale(Geometry(query));
}
coalesceImages(&coalesced, frames.begin(), frames.end());
for (Image &image : coalesced) {
Image final;
if (append) {
list<Image> to_append;
to_append.push_back(image);
to_append.push_back(watermark);
appendImages(&final, to_append.begin(), to_append.end(), true);
final.repage();
} else if (mc) {
image.backgroundColor("white");
image.extent(Geometry(image.columns(), image.rows() + 15));
image.composite(watermark, Magick::GravityType(gravity),
Magick::OverCompositeOp);
final = image;
} else {
image.composite(watermark, Magick::GravityType(gravity),
Magick::OverCompositeOp);
final = image;
}
image.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.quantizeDitherMethod(FloydSteinbergDitherMethod);
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");
}
}