Merge the latest cpp template from flutter-embedded-linux repo (#131)

Signed-off-by: Hidenori Matsubayashi <hidenori.matsubayashi@gmail.com>

templates/app/runner/command_options.h

@@ -1,4 +1,4 @@
-// Copyright 2021 Sony Corporation. All rights reserved.
+// Copyright 2022 Sony Corporation. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
@@ -13,8 +13,6 @@
 #include <unordered_map>
 #include <vector>
 
-// todo: Supports other types besides int, string.
-
 namespace commandline {
 
 namespace {
@@ -56,6 +54,15 @@ class CommandOptions {
                         ReaderInt(), required, true);
   }
 
+  void AddDouble(const std::string& name,
+              const std::string& short_name,
+              const std::string& description,
+              const double& default_value,
+              bool required) {
+    Add<double, ReaderDouble>(name, short_name, description, default_value,
+                        ReaderDouble(), required, true);
+  }
+
   void AddString(const std::string& name,
                  const std::string& short_name,
                  const std::string& description,
@@ -250,6 +257,10 @@ class CommandOptions {
     std::string operator()(const std::string& value) { return value; }
   };
 
+  struct ReaderDouble {
+    double operator()(const std::string& value) { return std::stod(value); }
+  };
+
   class Option {
    public:
     Option(const std::string& name,

templates/app/runner/flutter_embedder_options.h

@@ -1,4 +1,4 @@
-// Copyright 2021 Sony Corporation. All rights reserved.
+// Copyright 2022 Sony Corporation. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
@@ -21,6 +21,9 @@ class FlutterEmbedderOptions {
     options_.AddInt("rotation", "r",
                     "Window rotation(degree) [0(default)|90|180|270]", 0,
                     false);
+    options_.AddDouble("force-scale-factor", "s",
+                    "Force a scale factor instead using default value", 1.0,
+                    false);
 #if defined(FLUTTER_TARGET_BACKEND_GBM) || \
     defined(FLUTTER_TARGET_BACKEND_EGLSTREAM)
     // no more options.
@@ -72,6 +75,14 @@ class FlutterEmbedderOptions {
       }
     }
 
+    if (options_.Exist("force-scale-factor")) {
+      is_force_scale_factor_ = true;
+      scale_factor_ = options_.GetValue<double>("force-scale-factor");
+    } else {
+      is_force_scale_factor_ = false;
+      scale_factor_ = 1.0;
+    }
+
 #if defined(FLUTTER_TARGET_BACKEND_GBM) || \
     defined(FLUTTER_TARGET_BACKEND_EGLSTREAM)
     use_onscreen_keyboard_ = false;
@@ -112,6 +123,8 @@ class FlutterEmbedderOptions {
   flutter::FlutterViewController::ViewRotation WindowRotation() const {
     return window_view_rotation_;
   }
+  bool IsForceScaleFactor() const { return is_force_scale_factor_; }
+  double ScaleFactor() const { return scale_factor_; }
 
  private:
   commandline::CommandOptions options_;
@@ -126,6 +139,8 @@ class FlutterEmbedderOptions {
   int window_height_ = 720;
   flutter::FlutterViewController::ViewRotation window_view_rotation_ =
       flutter::FlutterViewController::ViewRotation::kRotation_0;
+  bool is_force_scale_factor_;
+  double scale_factor_;
 };
 
 #endif  // FLUTTER_EMBEDDER_OPTIONS_

templates/app/runner/main.cc

@@ -1,4 +1,4 @@
-// Copyright 2021 Sony Corporation. All rights reserved.
+// Copyright 2022 Sony Corporation. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
@@ -33,6 +33,8 @@ int main(int argc, char** argv) {
   view_properties.use_mouse_cursor = options.IsUseMouseCursor();
   view_properties.use_onscreen_keyboard = options.IsUseOnscreenKeyboard();
   view_properties.use_window_decoration = options.IsUseWindowDecoraation();
+  view_properties.force_scale_factor = options.IsForceScaleFactor();
+  view_properties.scale_factor = options.ScaleFactor();
 
   // The Flutter instance hosted by this window.
   FlutterWindow window(view_properties, project);