Proxy PPB_Input_Event, PPP_Input_Event, and associated IFs.

src/shared/ppapi_proxy/browser_ppp_input_event.h

+// Copyright 2010 The Native Client Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can
+// be found in the LICENSE file.
+
+#ifndef NATIVE_CLIENT_SRC_SHARED_PPAPI_PROXY_BROWSER_INPUT_EVENT_H_
+#define NATIVE_CLIENT_SRC_SHARED_PPAPI_PROXY_BROWSER_INPUT_EVENT_H_
+
+#include <map>
+
+#include "native_client/src/include/nacl_macros.h"
+// Needed because ppp_instance.h does not include everything it needs.
+#include "native_client/src/third_party/ppapi/c/pp_resource.h"
+#include "native_client/src/third_party/ppapi/c/pp_instance.h"
+#include "native_client/src/third_party/ppapi/c/ppb_input_event.h"
+
+struct PPP_InputEvent;
+
+namespace ppapi_proxy {
+
+// Implements the trusted side of the PPP_InputEvent interface.
+class BrowserInputEvent {
+ public:
+  static const PPP_InputEvent* GetInterface();
+
+  // PPP_InputEvent is dispatching an event, it needs to know whether it should
+  // ignore the 'handled' PP_Bool return value for events the NaCl instance is
+  // not filtering. These functions allow the PPB_InputEvent proxy code to
+  // BrowserInputEvent what event types are requested (filtering & not) and when
+  // requests for event types are cleared. See ppb_input_event_rpc_server.cc for
+  // where these functions are used.
+  static void InputEventsRequested(PP_Instance instance, uint32_t event_classes,
+                                   bool filtering);
+  static void InputEventsCleared(PP_Instance, uint32_t event_classes);
+  static bool InputEventTypeIsRegistered(PP_Instance instance,
+                                         PP_InputEvent_Type type);
+  static bool InputEventTypeIsFiltered(PP_Instance instance,
+                                       PP_InputEvent_Type type);
+
+  // Allows BrowserInstance to remove and instance from our map on deletion of

[sehr (please use chromium), 2011/07/20 00:33:41]

s/and/an/

[dmichael (off chromium), 2011/07/20 03:50:22]

Done.

+  // an instance. (TODO(NaCl team): It would probably make sense to use
+  // observer pattern for instance creation/deletion if we have much of this
+  // kind of stuff).
+  static void InstanceDestroyed(PP_Instance instance);
+
+ private:
+  // A struct to hold 'registered_nonfiltering' and 'registered_filtering'
+  // bitfields. This is used in the map below.
+  struct RegisteredTypes {
+    RegisteredTypes() : filtering(0), nonfiltering(0) {
+    }
+    uint32_t filtering;
+    uint32_t nonfiltering;
+  };
+
+  // This map is used so that when PPB_InputEvent is used to request input
+  // events, it can store the filtering flags here. Then, when PPP_InputEvent is
+  // dispatching an event, it can ignore the 'handled' PP_Bool return value for
+  // events the NaCl instance is not filtering.  See
+  // ppb_input_event_rpc_server.cc for where filtering bitfields are added to
+  // this map.
+  typedef std::map<PP_Instance, RegisteredTypes> InstanceRegisteredTypesMap;
+  static InstanceRegisteredTypesMap& instance_registered_map() {
+    static InstanceRegisteredTypesMap map;

[sehr (please use chromium), 2011/07/20 00:33:41]

The same thread safety issue we were talking about in my CL is here, right?  Or
is this only going to run on the main thread?

[dmichael (off chromium), 2011/07/20 03:50:22]

Input events always come in on the main thread. The RequestInputEvents,
RequestFilteringInputEvents, and ClearInputEvents, however, I have no control
over. Nice catch...  I guess we might as well start trying to put thread safety
in from the get-go, because it's hard to bandaid it on.

In this case, I realized this whole map was not necessary. It did help me catch
a bug in chrome, since I was always returning false for unfiltered events. But
in reality, Chrome should ignore our return value for us in the unfiltered case,
and we shouldn't have to worry about it in the proxy. I'll double check that
Brett's okay with this. It saves a bunch of error-prone code.

+    return map;
+  }
+
+ private:
+  NACL_DISALLOW_COPY_AND_ASSIGN(BrowserInputEvent);
+};
+
+}  // namespace ppapi_proxy
+
+#endif  // NATIVE_CLIENT_SRC_SHARED_PPAPI_PROXY_BROWSER_INPUT_EVENT_H_