Move host resource from the proxy to the shared_impl.

This is needed by my new unified resoruce tracker, which will use this file from the shared_impl in the new resource base object.

I fixed up the namespaces for the callers. Longer term, I want to put the
proxy in the ppapi namespace which will eliminate some of this mess.

Review URL: http://codereview.chromium.org/7623018

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@96678 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 68 insertions, 0 deletions

diff --git a/ppapi/shared_impl/host_resource.h b/ppapi/shared_impl/host_resource.h
new file mode 100644
index 0000000..0d9b3bf
--- /dev/null
+++ b/ppapi/shared_impl/host_resource.h
@@ -0,0 +1,68 @@
+// Copyright (c) 2011 The Chromium 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 PPAPI_SHARED_IMPL_HOST_RESOURCE_H_
+#define PPAPI_SHARED_IMPL_HOST_RESOURCE_H_
+
+#include "ppapi/c/pp_instance.h"
+#include "ppapi/c/pp_resource.h"
+
+namespace ppapi {
+
+// Represents a PP_Resource sent over the wire. This just wraps a PP_Resource.
+// The point is to prevent mistakes where the wrong resource value is sent.
+// Resource values are remapped in the plugin so that it can talk to multiple
+// hosts. If all values were PP_Resource, it would be easy to forget to do
+// this tranformation.
+//
+// All HostResources respresent IDs valid in the host.
+class HostResource {
+ public:
+  HostResource() : instance_(0), host_resource_(0) {
+  }
+
+  bool is_null() const {
+    return !host_resource_;
+  }
+
+  // Some resources are plugin-side only and don't have a corresponding
+  // resource in the host. Yet these resources still need an instance to be
+  // associated with. This function creates a HostResource with the given
+  // instances and a 0 host resource ID for these cases.
+  static HostResource MakeInstanceOnly(PP_Instance instance) {
+    HostResource resource;
+    resource.SetHostResource(instance, 0);
+    return resource;
+  }
+
+  // Sets and retrieves the internal PP_Resource which is valid for the host
+  // (a.k.a. renderer, as opposed to the plugin) process.
+  //
+  // DO NOT CALL THESE FUNCTIONS IN THE PLUGIN SIDE OF THE PROXY. The values
+  // will be invalid. See the class comment above.
+  void SetHostResource(PP_Instance instance, PP_Resource resource) {
+    instance_ = instance;
+    host_resource_ = resource;
+  }
+  PP_Resource host_resource() const {
+    return host_resource_;
+  }
+
+  PP_Instance instance() const { return instance_; }
+
+  // This object is used in maps so we need to provide this sorting operator.
+  bool operator<(const HostResource& other) const {
+    if (instance_ != other.instance_)
+      return instance_ < other.instance_;
+    return host_resource_ < other.host_resource_;
+  }
+
+ private:
+  PP_Instance instance_;
+  PP_Resource host_resource_;
+};
+
+}  // namespace ppapi
+
+#endif  // PPAPI_SHARED_IMPL_HOST_RESOURCE_H_