Add "stylus-tools" Wayland protocol.

components/exo/wayland/server.cc

Index: components/exo/wayland/server.cc
diff --git a/components/exo/wayland/server.cc b/components/exo/wayland/server.cc
index 099429624c776812176b9109acb65ebd7e8fd236..a9d28e314c1f778be284bf648eafb7d55b2ef817 100644
--- a/components/exo/wayland/server.cc
+++ b/components/exo/wayland/server.cc
@@ -5,6 +5,7 @@
 #include "components/exo/wayland/server.h"
 
 #include <alpha-compositing-unstable-v1-server-protocol.h>
+#include <annotation-unstable-v1-server-protocol.h>
 #include <gaming-input-unstable-v1-server-protocol.h>
 #include <gaming-input-unstable-v2-server-protocol.h>
 #include <grp.h>
@@ -164,6 +165,10 @@ DEFINE_UI_CLASS_PROPERTY_KEY(bool, kSurfaceHasBlendingKey, false);
 // to ignore the activation event originated by creation.
 DEFINE_UI_CLASS_PROPERTY_KEY(bool, kIgnoreWindowActivated, true);
 
+// A property key containing a boolean set to true if the window is
+// an annotation layer.
+DEFINE_UI_CLASS_PROPERTY_KEY(bool, kSurfaceHasAnnotationKey, false);
+
 wl_resource* GetSurfaceResource(Surface* surface) {
   return surface->GetProperty(kSurfaceResourceKey);
 }
@@ -3839,6 +3844,105 @@ void bind_keyboard_configuration(wl_client* client,
       resource, &keyboard_configuration_implementation, data, nullptr);
 }
 
+////////////////////////////////////////////////////////////////////////////////
+// annotation_features interface:
+
+class AnnotationFeatures : public SurfaceObserver {
+ public:
+  explicit AnnotationFeatures(Surface* surface) : surface_(surface) {
+    surface_->AddSurfaceObserver(this);
+    surface_->SetProperty(kSurfaceHasAnnotationKey, true);
+    surface_->SetAnnotationLayer(true);

[reveman, 2017/05/23 16:41:06]

Can we add an explicit request for turning this on/off instead of it magically
happening when this interface is instantiated?

[Vladislav Kaznacheev, 2017/05/23 23:48:56]

Done.

+  }
+  ~AnnotationFeatures() override {
+    if (surface_) {
+      surface_->RemoveSurfaceObserver(this);
+      surface_->SetProperty(kSurfaceHasAnnotationKey, false);
+      surface_->SetAnnotationLayer(false);
+    }
+  }
+
+  void SetStylusOnly(bool stylus_only) {
+    // TODO:

[reveman, 2017/05/23 16:41:06]

TODO(kaznacheev) and a short explanation and link to bug.

[Vladislav Kaznacheev, 2017/05/23 23:48:56]

Removed TODO

+  }
+
+  // Overridden from SurfaceObserver:
+  void OnSurfaceDestroying(Surface* surface) override {
+    surface->RemoveSurfaceObserver(this);
+    surface_ = nullptr;
+  }
+
+ private:
+  Surface* surface_;
+
+  DISALLOW_COPY_AND_ASSIGN(AnnotationFeatures);
+};
+
+void annotation_features_destroy(wl_client* client, wl_resource* resource) {
+  wl_resource_destroy(resource);
+}
+
+void annotation_features_set_input_mode(wl_client* client,
+                                        wl_resource* resource,
+                                        uint32_t mode) {
+  switch (mode) {
+    case ZCR_ANNOTATION_FEATURES_V1_INPUT_MODE_DEFAULT:
+      GetUserDataAs<AnnotationFeatures>(resource)->SetStylusOnly(false);
+      break;
+    case ZCR_ANNOTATION_FEATURES_V1_INPUT_MODE_STYLUS_ONLY:
+      GetUserDataAs<AnnotationFeatures>(resource)->SetStylusOnly(true);
+      break;
+    default:
+      DLOG(WARNING) << "Unsupported input mode: " << mode;
+      break;
+  }
+}
+
+const struct zcr_annotation_features_v1_interface
+    annotation_features_implementation = {annotation_features_destroy,
+                                          annotation_features_set_input_mode};
+
+////////////////////////////////////////////////////////////////////////////////
+// annotation interface:
+
+void annotation_destroy(wl_client* client, wl_resource* resource) {
+  wl_resource_destroy(resource);
+}
+
+void annotation_get_annotation_features(wl_client* client,
+                                        wl_resource* resource,
+                                        uint32_t id,
+                                        wl_resource* surface_resource) {
+  Surface* surface = GetUserDataAs<Surface>(surface_resource);
+  if (surface->GetProperty(kSurfaceHasAnnotationKey)) {
+    wl_resource_post_error(
+        resource, ZCR_ANNOTATION_V1_ERROR_ANNOTATION_FEATURES_EXISTS,
+        "an annotation_features object for that surface already exists");
+    return;
+  }
+
+  wl_resource* annotation_features_resource =
+      wl_resource_create(client, &zcr_annotation_features_v1_interface, 1, id);
+
+  SetImplementation(annotation_features_resource,
+                    &annotation_features_implementation,
+                    base::MakeUnique<AnnotationFeatures>(surface));
+}
+
+const struct zcr_annotation_v1_interface annotation_implementation = {
+    annotation_destroy, annotation_get_annotation_features};
+
+void bind_annotation(wl_client* client,
+                     void* data,
+                     uint32_t version,
+                     uint32_t id) {
+  wl_resource* resource =
+      wl_resource_create(client, &zcr_annotation_v1_interface, 1, id);
+
+  wl_resource_set_implementation(resource, &annotation_implementation, data,
+                                 nullptr);
+}
+
 }  // namespace
 
 ////////////////////////////////////////////////////////////////////////////////
@@ -3891,6 +3995,8 @@ Server::Server(Display* display)
                    bind_stylus_v2);
   wl_global_create(wl_display_.get(), &zcr_keyboard_configuration_v1_interface,
                    2, display_, bind_keyboard_configuration);
+  wl_global_create(wl_display_.get(), &zcr_annotation_v1_interface, 1, display_,
+                   bind_annotation);
 }
 
 Server::~Server() {}