mrmBot-Matrix/natives/whisper.cc

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#include <Magick++.h>
#include <napi.h>
#include <list>
using namespace std;
using namespace Magick;
Napi::Value Whisper(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 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;
Blob caption_blob;
readImages(&frames, Blob(data.Data(), data.Length()));
size_t width = frames.front().baseColumns();
size_t height = frames.front().baseRows();
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int dividedWidth = width / 175;
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Image caption_image;
caption_image.size(Geometry(to_string(width) + "x" + to_string(height)));
caption_image.backgroundColor("none");
caption_image.fillColor("white");
caption_image.font("Upright");
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caption_image.fontPointsize(width / 8);
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caption_image.textGravity(Magick::CenterGravity);
caption_image.read("pango:" + caption);
caption_image.trim();
caption_image.repage();
Image caption_fill = caption_image;
caption_fill.extent(Geometry(width, height), Magick::CenterGravity);
caption_fill.channel(Magick::AlphaChannel);
caption_fill.morphology(Magick::EdgeOutMorphology, "Octagon",
dividedWidth != 0 ? dividedWidth : 1);
caption_fill.backgroundColor("black");
caption_fill.alphaChannel(Magick::ShapeAlphaChannel);
size_t fill_width = caption_fill.columns();
size_t fill_height = caption_fill.rows();
caption_image.extent(Geometry(fill_width, fill_height),
Magick::CenterGravity);
caption_image.composite(caption_fill, Magick::CenterGravity,
Magick::DstOverCompositeOp);
coalesceImages(&coalesced, frames.begin(), frames.end());
for (Image &image : coalesced) {
list<Image> images;
image.composite(caption_image, Magick::CenterGravity,
Magick::OverCompositeOp);
image.magick(type);
image.animationDelay(delay == 0 ? image.animationDelay() : delay);
captioned.push_back(image);
}
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());
} catch (...) {
throw Napi::Error::New(env, "Unknown error");
}
}