mrmBot-Matrix/natives/meme.cc

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#include <Magick++.h>
#include <napi.h>
#include <list>
using namespace std;
using namespace Magick;
Napi::Value Meme(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 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;
Blob blob;
list<Image> frames;
list<Image> coalesced;
list<Image> mid;
Image top_text;
Image bottom_text;
readImages(&frames, Blob(data.Data(), data.Length()));
coalesceImages(&coalesced, frames.begin(), frames.end());
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int width = coalesced.front().columns();
top_text.size(Geometry(to_string(width)));
top_text.backgroundColor("none");
top_text.font("Impact");
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top_text.fontPointsize(width / 12);
top_text.textGravity(Magick::CenterGravity);
top_text.read("pango:<span foreground='white'>" + 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);
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if (bottom != "") {
bottom_text.size(Geometry(to_string(coalesced.front().columns())));
bottom_text.backgroundColor("none");
bottom_text.font("Impact");
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bottom_text.fontPointsize(width / 12);
bottom_text.textGravity(Magick::CenterGravity);
bottom_text.read("pango:<span foreground='white'>" + 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 (bottom != "")
image.composite(bottom_text, Magick::SouthGravity,
Magick::OverCompositeOp);
image.magick(type);
mid.push_back(image);
}
optimizeTransparency(mid.begin(), mid.end());
if (type == "gif") {
for (Image &image : mid) {
image.quantizeDither(false);
image.quantize();
if (delay != 0) image.animationDelay(delay);
}
}
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");
}
}