mrmBot-Matrix/natives/caption.cc

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#include <napi.h>
#include <list>
#include <Magick++.h>
using namespace std;
using namespace Magick;
class CaptionWorker : public Napi::AsyncWorker {
public:
CaptionWorker(Napi::Function& callback, string caption, string in_path, string type, int delay)
: Napi::AsyncWorker(callback), caption(caption), in_path(in_path), type(type), delay(delay) {}
~CaptionWorker() {}
void Execute() {
list <Image> frames;
list <Image> coalesced;
list <Image> captioned;
list <Image> result;
readImages(&frames, in_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");
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caption_image.fontPointsize(width / 13);
caption_image.textGravity(Magick::CenterGravity);
caption_image.read("pango:" + caption);
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caption_image.extent(Geometry(width, caption_image.rows() + (width / 13)), Magick::CenterGravity);
coalesceImages(&coalesced, frames.begin(), frames.end());
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());
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if (type == "gif") {
for (Image &image : captioned) {
image.quantizeDither(false);
image.quantize();
}
}
writeImages(captioned.begin(), captioned.end(), &blob);
}
void OnOK() {
Callback().Call({Env().Undefined(), Napi::Buffer<char>::Copy(Env(), (char *)blob.data(), blob.length()), Napi::String::From(Env(), type)});
}
private:
string caption, in_path, type;
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int delay;
Blob blob;
};
Napi::Value Caption(const Napi::CallbackInfo &info)
{
Napi::Env env = info.Env();
Napi::Object obj = info[0].As<Napi::Object>();
Napi::Function cb = info[1].As<Napi::Function>();
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;
CaptionWorker* captionWorker = new CaptionWorker(cb, caption, path, type, delay);
captionWorker->Queue();
return env.Undefined();
}