mrmBot-Matrix/natives/uncaption.cc

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#include <Magick++.h>
#include <napi.h>
#include <list>
using namespace std;
using namespace Magick;
Napi::Value Uncaption(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());
Image firstImage = coalesced.front();
ssize_t columns = firstImage.columns();
ssize_t rows = firstImage.rows();
ssize_t row;
for (row = 0; row < rows; ++row) {
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ColorGray color = firstImage.pixelColor(0, row);
if (color.shade() < 0.95) {
break;
}
}
Geometry geom = Geometry(columns, row == rows ? rows : rows - row, 0,
row == rows ? 0 : row);
for (Image &image : coalesced) {
image.virtualPixelMethod(Magick::TransparentVirtualPixelMethod);
image.backgroundColor("none");
image.extent(geom);
image.magick(type);
mid.push_back(image);
}
optimizeTransparency(mid.begin(), mid.end());
if (type == "gif") {
for (Image &image : mid) {
image.quantizeDither(false);
image.quantize();
if (delay != 0) image.animationDelay(delay);
}
}
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", type);
return result;
} catch (std::exception const &err) {
throw Napi::Error::New(env, err.what());
} catch (...) {
throw Napi::Error::New(env, "Unknown error");
}
}