New thunk system for Pepper proxy and implementation

ppapi/thunk/ppb_image_data_thunk.cc

+// 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.
+
+#include "ppapi/c/pp_errors.h"
+#include "ppapi/c/ppb_image_data.h"
+#include "ppapi/shared_impl/image_data_impl.h"
+#include "ppapi/thunk/enter.h"
+#include "ppapi/thunk/ppb_image_data_api.h"
+#include "ppapi/thunk/resource_creation_api.h"
+
+namespace ppapi {
+namespace thunk {
+
+namespace {
+
+PP_ImageDataFormat GetNativeImageDataFormat() {
+  return pp::shared_impl::ImageDataImpl::GetNativeImageDataFormat();
+}
+
+PP_Bool IsImageDataFormatSupported(PP_ImageDataFormat format) {
+  return pp::shared_impl::ImageDataImpl::IsImageDataFormatSupported(format)
+      ? PP_TRUE : PP_FALSE;
+}
+
+PP_Resource Create(PP_Instance instance,
+                   PP_ImageDataFormat format,
+                   const PP_Size* size,
+                   PP_Bool init_to_zero) {
+  EnterFunction<ResourceCreationAPI> enter(instance, true);
+  if (enter.failed())
+    return 0;
+  return enter.functions()->CreateImageData(instance, format,
+                                            *size, init_to_zero);
+}
+
+PP_Bool IsImageData(PP_Resource resource) {
+  EnterResource<PPB_ImageData_API> enter(resource, false);
+  return enter.succeeded() ? PP_TRUE : PP_FALSE;
+}
+
+PP_Bool Describe(PP_Resource resource, PP_ImageDataDesc* desc) {
+  // Give predictable values on failure.
+  memset(desc, 0, sizeof(PP_ImageDataDesc));
+
+  EnterResource<PPB_ImageData_API> enter(resource, true);
+  if (enter.failed())
+    return PP_FALSE;
+  return enter.object()->Describe(desc);
+}
+
+void* Map(PP_Resource resource) {
+  EnterResource<PPB_ImageData_API> enter(resource, true);
+  if (enter.failed())
+    return NULL;
+  return enter.object()->Map();
+}
+
+void Unmap(PP_Resource resource) {
+  EnterResource<PPB_ImageData_API> enter(resource, true);
+  if (enter.failed())
+    return;
+  enter.object()->Unmap();
+}
+
+const PPB_ImageData g_ppb_image_data_thunk = {
+  &GetNativeImageDataFormat,
+  &IsImageDataFormatSupported,
+  &Create,
+  &IsImageData,
+  &Describe,
+  &Map,
+  &Unmap,
+};
+
+}  // namespace
+
+const PPB_ImageData* GetPPB_ImageData_Thunk() {
+  return &g_ppb_image_data_thunk;
+}
+
+}  // namespace thunk
+}  // namespace ppapi