mrmBot-Matrix/natives/meme.cc

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#include <napi.h>
#include <list>
#include <Magick++.h>
using namespace std;
using namespace Magick;
class MemeWorker : public Napi::AsyncWorker {
public:
MemeWorker(Napi::Function& callback, string in_path, string text_top, string text_bottom, string type, int delay)
: Napi::AsyncWorker(callback), in_path(in_path), text_top(text_top), text_bottom(text_bottom), type(type), delay(delay) {}
~MemeWorker() {}
void Execute() {
list <Image> frames;
list <Image> coalesced;
list <Image> mid;
Image top_text;
Image bottom_text;
readImages(&frames, in_path);
coalesceImages(&coalesced, frames.begin(), frames.end());
for_each(coalesced.begin(), coalesced.end(), scaleImage(Geometry(600, 600)));
top_text.size(Geometry(to_string(coalesced.front().columns())));
top_text.backgroundColor("none");
top_text.font("Impact");
top_text.fontPointsize(40);
top_text.textGravity(Magick::CenterGravity);
top_text.read("pango:<span foreground='white'>" + text_top + "</span>");
Image top_text_fill = top_text;
top_text_fill.channel(Magick::AlphaChannel);
top_text_fill.morphology(Magick::EdgeOutMorphology, "Octagon");
top_text_fill.backgroundColor("black");
top_text_fill.alphaChannel(Magick::ShapeAlphaChannel);
top_text.composite(top_text_fill, Magick::CenterGravity, Magick::DstOverCompositeOp);
if (text_bottom != "") {
bottom_text.size(Geometry(to_string(coalesced.front().columns())));
bottom_text.backgroundColor("none");
bottom_text.font("Impact");
bottom_text.fontPointsize(40);
bottom_text.textGravity(Magick::CenterGravity);
bottom_text.read("pango:<span foreground='white'>" + text_bottom + "</span>");
Image bottom_text_fill = bottom_text;
bottom_text_fill.channel(Magick::AlphaChannel);
bottom_text_fill.morphology(Magick::EdgeOutMorphology, "Octagon");
bottom_text_fill.backgroundColor("black");
bottom_text_fill.alphaChannel(Magick::ShapeAlphaChannel);
bottom_text.composite(bottom_text_fill, Magick::CenterGravity, Magick::DstOverCompositeOp);
}
for (Image &image : coalesced) {
image.composite(top_text, Magick::NorthGravity, Magick::OverCompositeOp);
if (text_bottom != "") image.composite(bottom_text, Magick::SouthGravity, Magick::OverCompositeOp);
image.magick(type);
mid.push_back(image);
}
optimizeTransparency(mid.begin(), mid.end());
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if (type == "gif") {
for (Image &image : mid) {
image.quantizeDither(false);
image.quantize();
if (delay != 0) image.animationDelay(delay);
}
}
writeImages(mid.begin(), mid.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 in_path, type, text_top, text_bottom;
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int delay;
Blob blob;
};
Napi::Value Meme(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 top = obj.Get("top").As<Napi::String>().Utf8Value();
string bottom = obj.Get("bottom").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;
MemeWorker* blurWorker = new MemeWorker(cb, path, top, bottom, type, delay);
blurWorker->Queue();
return env.Undefined();
}