mrmBot-Matrix/natives/caption.cc

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#include <Magick++.h>
#include <napi.h>
#include <list>
using namespace std;
using namespace Magick;
Napi::Value Caption(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 caption = 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> captioned;
readImages(&frames, path);
size_t width = frames.front().baseColumns();
string query(to_string(width - ((width / 25) * 2)) + "x");
Image caption_image(Geometry(query), Color("white"));
caption_image.fillColor("black");
caption_image.alpha(true);
caption_image.font("Futura");
caption_image.fontPointsize(width / 13);
caption_image.textGravity(Magick::CenterGravity);
caption_image.read("pango:" + caption);
caption_image.extent(Geometry(width, caption_image.rows() + (width / 13)),
Magick::CenterGravity);
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coalesceImages(&coalesced, frames.begin(), frames.end());
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for (Image &image : coalesced) {
Image appended;
list<Image> images;
image.backgroundColor("white");
images.push_back(caption_image);
images.push_back(image);
appendImages(&appended, images.begin(), images.end(), true);
appended.repage();
appended.magick(type);
appended.animationDelay(delay == 0 ? image.animationDelay() : delay);
appended.gifDisposeMethod(Magick::BackgroundDispose);
captioned.push_back(appended);
}
optimizeTransparency(captioned.begin(), captioned.end());
if (type == "gif") {
for (Image &image : captioned) {
image.quantizeDither(false);
image.quantize();
}
}
writeImages(captioned.begin(), captioned.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());
}
}