mrmBot-Matrix/natives/reddit.cc

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#include <Magick++.h>
#include <napi.h>
#include <list>
using namespace std;
using namespace Magick;
Napi::Value Reddit(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 text = obj.Get("caption").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;
Image watermark;
Image text_image;
readImages(&frames, Blob(data.Data(), data.Length()));
watermark.read("./assets/images/reddit.png");
text_image.textGravity(Magick::WestGravity);
text_image.font("Roboto");
text_image.fontPointsize(47);
text_image.backgroundColor("none");
text_image.read("pango:<span foreground='white'>" + text + "</span>");
watermark.composite(text_image, Geometry("+375+46"),
Magick::OverCompositeOp);
string query(to_string(frames.front().baseColumns()) + "x");
watermark.scale(Geometry(query));
coalesceImages(&coalesced, frames.begin(), frames.end());
for (Image &image : coalesced) {
Image final;
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();
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 (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");
}
}