mrmBot-Matrix/natives/jpeg.cc

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#include <Magick++.h>
#include <napi.h>
#include <list>
using namespace std;
using namespace Magick;
Napi::Value Jpeg(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>>();
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string type = obj.Get("type").As<Napi::String>().Utf8Value();
int delay =
obj.Has("delay") ? obj.Get("delay").As<Napi::Number>().Int32Value() : 0;
Blob blob;
Napi::Object result = Napi::Object::New(env);
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if (type == "gif") {
list<Image> frames;
list<Image> coalesced;
list<Image> jpeged;
readImages(&frames, Blob(data.Data(), data.Length()));
coalesceImages(&coalesced, frames.begin(), frames.end());
for (Image &image : coalesced) {
Blob temp;
image.quality(1);
image.magick("JPEG");
image.write(&temp);
Image newImage(temp);
newImage.magick(type);
newImage.animationDelay(delay == 0 ? image.animationDelay() : delay);
jpeged.push_back(newImage);
}
optimizeTransparency(jpeged.begin(), jpeged.end());
for (Image &image : jpeged) {
image.quantizeDither(false);
image.quantize();
}
writeImages(jpeged.begin(), jpeged.end(), &blob);
result.Set("data", Napi::Buffer<char>::Copy(env, (char *)blob.data(),
blob.length()));
result.Set("type", type);
} else {
Image image;
image.read(Blob(data.Data(), data.Length()));
image.quality(1);
image.magick("JPEG");
image.write(&blob);
result.Set("data", Napi::Buffer<char>::Copy(env, (char *)blob.data(),
blob.length()));
result.Set("type", "jpg");
}
return result;
} catch (std::exception const &err) {
throw Napi::Error::New(env, err.what());
} catch (...) {
throw Napi::Error::New(env, "Unknown error");
}
}