mrmBot-Matrix/natives/speed.cc

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#include <Magick++.h>
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#include <napi.h>
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#include <list>
using namespace std;
using namespace Magick;
Napi::Value Speed(const Napi::CallbackInfo &info) {
Napi::Env env = info.Env();
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try {
Napi::Object obj = info[0].As<Napi::Object>();
string path = obj.Get("path").As<Napi::String>().Utf8Value();
bool slow =
obj.Has("slow") ? obj.Get("slow").As<Napi::Boolean>().Value() : false;
string type = obj.Get("type").As<Napi::String>().Utf8Value();
int delay =
obj.Has("delay") ? obj.Get("delay").As<Napi::Number>().Int32Value() : 0;
int speed =
obj.Has("speed") ? obj.Get("speed").As<Napi::Number>().Int32Value() : 2;
Blob blob;
list<Image> frames;
readImages(&frames, path);
// if passed a delay, use that. otherwise use the average frame delay.
if (delay == 0) {
vector<int> old_delays;
bool removeFrames = false;
for (Image &image : frames) {
int animation_delay = image.animationDelay();
old_delays.push_back(animation_delay);
}
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for (Image &image : frames) {
int old_delay = image.animationDelay();
int new_delay = slow ? old_delay * speed : old_delay / speed;
if (!slow && new_delay <= 1) {
removeFrames = true;
break;
}
image.animationDelay(new_delay);
image.gifDisposeMethod(Magick::BackgroundDispose);
}
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if (removeFrames) {
for (list<Image>::iterator i = frames.begin(); i != frames.end(); ++i) {
int index = distance(frames.begin(), i);
i->animationDelay(old_delays[index]);
}
for (int i = 0; i < speed - 1; ++i) {
frames.remove_if([counter = 0](const auto x) mutable {
return ++counter % 2 == 0;
});
}
}
} else {
int new_delay = slow ? delay * speed : delay / speed;
if (!slow && new_delay <= 1) {
for (int i = 0; i < speed - 1; ++i) {
frames.remove_if([counter = 0](const auto x) mutable {
return ++counter % 2 == 0;
});
}
} else {
for_each(frames.begin(), frames.end(), animationDelayImage(new_delay));
}
}
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for_each(frames.begin(), frames.end(), magickImage(type));
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writeImages(frames.begin(), frames.end(), &blob);
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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");
}
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}