x11: support fullscreen option (sony#389)

This change adds fullscreen option support.

Related issues:
- sony#37
- sony/flutter-elinux#136

Signed-off-by: Hidenori Matsubayashi <[email protected]>

Author: HidenoriMatsubayashi

src/flutter/shell/platform/linux_embedded/window/elinux_window_x11.cc

@@ -132,7 +132,8 @@ bool ELinuxWindowX11::CreateRenderSurface(int32_t width,
   }
   native_window_ = std::make_unique<NativeWindowX11>(
       display_, context_egl->GetAttrib(EGL_NATIVE_VISUAL_ID),
-      view_properties_.title, width, height, view_properties_.enable_vsync);
+      view_properties_.title, width, height, view_properties_.enable_vsync,
+      view_properties_.view_mode == FlutterDesktopViewMode::kFullscreen);
   if (!native_window_->IsValid()) {
     ELINUX_LOG(ERROR) << "Failed to create the native window";
     return false;

src/flutter/shell/platform/linux_embedded/window/native_window_x11.cc

@@ -23,7 +23,8 @@ NativeWindowX11::NativeWindowX11(Display* display,
                                  const char* title,
                                  const size_t width,
                                  const size_t height,
-                                 bool enable_vsync) {
+                                 bool enable_vsync,
+                                 bool fullscreen) {
   XVisualInfo visualTemplate;
   visualTemplate.visualid = visual_id;
 
@@ -44,10 +45,20 @@ NativeWindowX11::NativeWindowX11(Display* display,
       ButtonReleaseMask | PointerMotionMask | EnterWindowMask |
       LeaveWindowMask | FocusChangeMask | StructureNotifyMask;
 
-  window_ =
-      XCreateWindow(display, RootWindow(display, visual->screen), 0, 0, width,
-                    height, 0, visual->depth, InputOutput, visual->visual,
-                    CWBorderPixel | CWColormap | CWEventMask, &windowAttribs);
+  auto window_width = width;
+  auto window_height = height;
+  if (fullscreen) {
+    XWindowAttributes attr;
+    XGetWindowAttributes(display, RootWindow(display, visual->screen), &attr);
+    window_width = attr.width;
+    window_height = attr.height;
+    windowAttribs.override_redirect = True;
+  }
+
+  window_ = XCreateWindow(
+      display, RootWindow(display, visual->screen), 0, 0, window_width,
+      window_height, 0, visual->depth, InputOutput, visual->visual,
+      CWBorderPixel | CWColormap | CWEventMask, &windowAttribs);
   if (!window_) {
     ELINUX_LOG(ERROR) << "Failed to the create window.";
     return;

src/flutter/shell/platform/linux_embedded/window/native_window_x11.h

@@ -18,7 +18,8 @@ class NativeWindowX11 : public NativeWindow {
                   const char* title,
                   const size_t width,
                   const size_t height,
-                  bool enable_vsync);
+                  bool enable_vsync,
+                  bool fullscreen);
   ~NativeWindowX11() = default;
 
   // |NativeWindow|