Move QR code decoding to c++ module

natives/image.cc

@@ -21,6 +21,7 @@
 #include "mirror.h"
 #include "misc.h"
 #include "motivate.h"
+#include "qr.h"
 #include "resize.h"
 #include "reverse.h"
 #include "scott.h"
@@ -56,6 +57,7 @@ Napi::Object Init(Napi::Env env, Napi::Object exports)
   exports.Set(Napi::String::New(env, "meme"), Napi::Function::New(env, Meme));
   exports.Set(Napi::String::New(env, "mirror"), Napi::Function::New(env, Mirror));
   exports.Set(Napi::String::New(env, "motivate"), Napi::Function::New(env, Motivate));
+  exports.Set(Napi::String::New(env, "qrread"), Napi::Function::New(env, QrRead));
   exports.Set(Napi::String::New(env, "resize"), Napi::Function::New(env, Resize));
   exports.Set(Napi::String::New(env, "reverse"), Napi::Function::New(env, Reverse));
   exports.Set(Napi::String::New(env, "scott"), Napi::Function::New(env, Scott));

natives/qr.cc

@@ -0,0 +1,52 @@
+#include <napi.h>
+#include <iostream>
+#include <ZXing/ReadBarcode.h>
+#include <ZXing/TextUtfEncoding.h>
+
+#define STB_IMAGE_IMPLEMENTATION
+#include <stb/stb_image.h>
+
+using namespace std;
+using namespace ZXing;
+
+class QrReadWorker : public Napi::AsyncWorker {
+ public:
+  QrReadWorker(Napi::Function& callback, string in_path)
+      : Napi::AsyncWorker(callback), in_path(in_path) {}
+  ~QrReadWorker() {}
+
+  void Execute() {
+    int width, height, channels;
+    unique_ptr<stbi_uc, void(*)(void*)> buffer(stbi_load(in_path.c_str(), &width, &height, &channels, 4), stbi_image_free);
+    auto result = ReadBarcode(width, height, buffer.get(), width * 4, 4, 0, 1, 2, { BarcodeFormat::QR_CODE });
+    if (result.isValid()) {
+      final = TextUtfEncoding::ToUtf8(result.text());
+      missing = false;
+    } else {
+      final = "";
+    }
+  }
+
+  void OnOK() {
+    Napi::Object object = Napi::Object::New(Env());
+    object.Set("qrText", final);
+    object.Set("missing", missing);
+    Callback().Call({Env().Undefined(), object});
+  }
+
+ private:
+  string in_path, final;
+  bool missing = true;
+};
+
+Napi::Value QrRead(const Napi::CallbackInfo &info)
+{
+  Napi::Env env = info.Env();
+
+  string in_path = info[0].As<Napi::String>().Utf8Value();
+  Napi::Function cb = info[1].As<Napi::Function>();
+
+  QrReadWorker* qrReadWorker = new QrReadWorker(cb, in_path);
+  qrReadWorker->Queue();
+  return env.Undefined();
+}

natives/qr.h

@@ -0,0 +1,8 @@
+#ifndef ESMBOT_NATIVES_QR_H_
+#define ESMBOT_NATIVES_QR_H_
+
+#include <napi.h>
+
+Napi::Value QrRead(const Napi::CallbackInfo& info);
+
+#endif