mrmBot-Matrix/natives/spin.cc

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#include <napi.h>
#include <list>
#include <Magick++.h>
using namespace std;
using namespace Magick;
class SpinWorker : public Napi::AsyncWorker {
public:
SpinWorker(Napi::Function& callback, string in_path, string type, int delay)
: Napi::AsyncWorker(callback), in_path(in_path), type(type), delay(delay) {}
~SpinWorker() {}
void Execute() {
list <Image> frames;
list <Image> coalesced;
list <Image> mid;
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readImages(&frames, in_path);
coalesceImages(&coalesced, frames.begin(), frames.end());
if (type != "GIF") {
list <Image>::iterator it = coalesced.begin();
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for (int i = 0; i < 29; ++i) {
coalesced.push_back(*it);
}
}
int i = 0;
for (Image &image : coalesced) {
image.scale(Geometry("256x256"));
image.alphaChannel(Magick::SetAlphaChannel);
double rotation[1] = {360 * i / coalesced.size()};
image.distort(Magick::ScaleRotateTranslateDistortion, 1, rotation);
image.magick("GIF");
mid.push_back(image);
i++;
}
optimizeTransparency(mid.begin(), mid.end());
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if (delay != 0) {
for_each(mid.begin(), mid.end(), animationDelayImage(delay));
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} else if (type != "GIF") {
for_each(mid.begin(), mid.end(), animationDelayImage(5));
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}
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for (Image &image : mid) {
image.quantizeDitherMethod(FloydSteinbergDitherMethod);
image.quantize();
}
writeImages(mid.begin(), mid.end(), &blob);
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}
void OnOK() {
Callback().Call({Env().Undefined(), Napi::Buffer<char>::Copy(Env(), (char *)blob.data(), blob.length())});
}
private:
string in_path, type;
int delay;
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Blob blob;
};
Napi::Value Spin(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 type = obj.Get("type").As<Napi::String>().Utf8Value();
int delay = obj.Has("delay") ? obj.Get("delay").As<Napi::Number>().Int32Value() : 0;
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SpinWorker* blurWorker = new SpinWorker(cb, path, type, delay);
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blurWorker->Queue();
return env.Undefined();
}