mrmBot-Matrix/natives/spin.cc

73 lines
No EOL
2.1 KiB
C++

#include <Magick++.h>
#include <napi.h>
#include <list>
using namespace std;
using namespace Magick;
Napi::Value Spin(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 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;
readImages(&frames, Blob(data.Data(), data.Length()));
coalesceImages(&coalesced, frames.begin(), frames.end());
if (type != "gif") {
list<Image>::iterator it = coalesced.begin();
for (int i = 0; i < 29; ++i) {
coalesced.push_back(*it);
}
}
int i = 0;
for (Image &image : coalesced) {
image.virtualPixelMethod(Magick::TransparentVirtualPixelMethod);
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++;
}
for_each(mid.begin(), mid.end(),
gifDisposeMethodImage(Magick::BackgroundDispose));
optimizeTransparency(mid.begin(), mid.end());
if (delay != 0) {
for_each(mid.begin(), mid.end(), animationDelayImage(delay));
} else if (type != "gif") {
for_each(mid.begin(), mid.end(), animationDelayImage(5));
}
for (Image &image : mid) {
image.quantizeDitherMethod(FloydSteinbergDitherMethod);
image.quantize();
}
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", "gif");
return result;
} catch (std::exception const &err) {
throw Napi::Error::New(env, err.what());
} catch (...) {
throw Napi::Error::New(env, "Unknown error");
}
}