Implement the gamepad API in the IPC proxy

content/browser/renderer_host/pepper/pepper_gamepad_host_unittest.cc

+// Copyright (c) 2012 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 <string.h>
+
+#include "base/memory/scoped_ptr.h"
+#include "base/memory/weak_ptr.h"
+#include "content/browser/gamepad/gamepad_test_helpers.h"
+#include "content/browser/renderer_host/pepper/browser_ppapi_host_test.h"
+#include "content/browser/renderer_host/pepper/pepper_gamepad_host.h"
+#include "content/common/gamepad_hardware_buffer.h"
+#include "ppapi/c/pp_errors.h"
+#include "ppapi/host/host_message_context.h"
+#include "ppapi/proxy/gamepad_resource.h"
+#include "ppapi/proxy/ppapi_messages.h"
+#include "ppapi/proxy/resource_message_params.h"
+#include "ppapi/shared_impl/ppb_gamepad_shared.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace content {
+
+namespace {
+
+class PepperGamepadHostTest
+    : public testing::Test,
+      public BrowserPpapiHostTest {
+ public:
+  PepperGamepadHostTest() {
+  }
+  ~PepperGamepadHostTest() {
+  }
+
+  void ConstructService(const WebKit::WebGamepads& test_data) {
+    service_.reset(new GamepadServiceTestConstructor(test_data));
+  }
+
+  GamepadService* gamepad_service() { return service_->gamepad_service(); }
+
+ protected:
+  scoped_ptr<GamepadServiceTestConstructor> service_;
+
+  DISALLOW_COPY_AND_ASSIGN(PepperGamepadHostTest);
+};
+
+inline ptrdiff_t AddressDiff(const void* a, const void* b) {
+  return static_cast<const char*>(a) - static_cast<const char*>(b);
+}
+
+}  // namespace
+
+// Validate the memory layout of the Pepper proxy struct matches the content
+// one. The proxy can't depend on content so has a duplicate definition. This
+// code can see both definitions so we do the validation here.
+TEST_F(PepperGamepadHostTest, ValidateHardwareBuffersMatch) {
+  // Hardware buffer.
+  COMPILE_ASSERT(sizeof(ppapi::ContentGamepadHardwareBuffer) ==
+                 sizeof(content::GamepadHardwareBuffer),
+                 gamepad_hardware_buffers_must_match);
+  ppapi::ContentGamepadHardwareBuffer ppapi_buf;
+  GamepadHardwareBuffer content_buf;
+  EXPECT_EQ(AddressDiff(&content_buf.sequence, &content_buf),
+            AddressDiff(&ppapi_buf.sequence, &ppapi_buf));
+  EXPECT_EQ(AddressDiff(&content_buf.buffer, &content_buf),
+            AddressDiff(&ppapi_buf.buffer, &ppapi_buf));
+}
+
+TEST_F(PepperGamepadHostTest, ValidateGamepadsMatch) {
+  // Gamepads.
+  COMPILE_ASSERT(sizeof(ppapi::WebKitGamepads) ==
+                 sizeof(WebKit::WebGamepads),
+                 gamepads_data_must_match);
+  ppapi::WebKitGamepads ppapi_gamepads;
+  WebKit::WebGamepads web_gamepads;
+  EXPECT_EQ(AddressDiff(&web_gamepads.length, &web_gamepads),
+            AddressDiff(&ppapi_gamepads.length, &ppapi_gamepads));
+
+  // See comment below on storage & the EXPECT macro.
+  size_t webkit_items_length_cap = WebKit::WebGamepads::itemsLengthCap;
+  size_t ppapi_items_length_cap = ppapi::WebKitGamepads::kItemsLengthCap;
+  EXPECT_EQ(webkit_items_length_cap, ppapi_items_length_cap);
+
+  for (size_t i = 0; i < web_gamepads.itemsLengthCap; i++) {
+    EXPECT_EQ(AddressDiff(&web_gamepads.items[0], &web_gamepads),
+              AddressDiff(&ppapi_gamepads.items[0], &ppapi_gamepads));
+  }
+}
+
+TEST_F(PepperGamepadHostTest, ValidateGamepadMatch) {
+  // Gamepad.
+  COMPILE_ASSERT(sizeof(ppapi::WebKitGamepad) ==
+                 sizeof(WebKit::WebGamepad),
+                 gamepad_data_must_match);
+  ppapi::WebKitGamepad ppapi_gamepad;
+  WebKit::WebGamepad web_gamepad;
+
+  // Using EXPECT seems to force storage for the parameter, which the constants
+  // in the WebKit/PPAPI headers don't have. So we have to use temporaries
+  // before comparing them.
+  size_t webkit_id_length_cap = WebKit::WebGamepad::idLengthCap;
+  size_t ppapi_id_length_cap = ppapi::WebKitGamepad::kIdLengthCap;
+  EXPECT_EQ(webkit_id_length_cap, ppapi_id_length_cap);
+
+  size_t webkit_axes_length_cap = WebKit::WebGamepad::axesLengthCap;
+  size_t ppapi_axes_length_cap = ppapi::WebKitGamepad::kAxesLengthCap;
+  EXPECT_EQ(webkit_axes_length_cap, ppapi_axes_length_cap);
+
+  size_t webkit_buttons_length_cap = WebKit::WebGamepad::buttonsLengthCap;
+  size_t ppapi_buttons_length_cap = ppapi::WebKitGamepad::kButtonsLengthCap;
+  EXPECT_EQ(webkit_buttons_length_cap, ppapi_buttons_length_cap);
+
+  EXPECT_EQ(AddressDiff(&web_gamepad.connected, &web_gamepad),
+            AddressDiff(&ppapi_gamepad.connected, &ppapi_gamepad));
+  EXPECT_EQ(AddressDiff(&web_gamepad.id, &web_gamepad),
+            AddressDiff(&ppapi_gamepad.id, &ppapi_gamepad));
+  EXPECT_EQ(AddressDiff(&web_gamepad.timestamp, &web_gamepad),
+            AddressDiff(&ppapi_gamepad.timestamp, &ppapi_gamepad));
+  EXPECT_EQ(AddressDiff(&web_gamepad.axesLength, &web_gamepad),
+            AddressDiff(&ppapi_gamepad.axes_length, &ppapi_gamepad));
+  EXPECT_EQ(AddressDiff(&web_gamepad.axes, &web_gamepad),
+            AddressDiff(&ppapi_gamepad.axes, &ppapi_gamepad));
+  EXPECT_EQ(AddressDiff(&web_gamepad.buttonsLength, &web_gamepad),
+            AddressDiff(&ppapi_gamepad.buttons_length, &ppapi_gamepad));
+  EXPECT_EQ(AddressDiff(&web_gamepad.buttons, &web_gamepad),
+            AddressDiff(&ppapi_gamepad.buttons, &ppapi_gamepad));
+}
+
+TEST_F(PepperGamepadHostTest, WaitForReply) {
+  WebKit::WebGamepads default_data;
+  memset(&default_data, 0, sizeof(WebKit::WebGamepads));
+  default_data.length = 1;
+  default_data.items[0].connected = true;
+  default_data.items[0].buttonsLength = 1;
+  ConstructService(default_data);
+
+  PP_Instance pp_instance = 12345;
+  PP_Resource pp_resource = 67890;
+  PepperGamepadHost gamepad_host(gamepad_service(), GetPpapiHost(),
+                                 pp_instance, pp_resource);
+
+  // Synthesize a request for gamepad data.
+  ppapi::host::HostMessageContext context(
+      ppapi::proxy::ResourceMessageCallParams(pp_resource, 1));
+  EXPECT_EQ(PP_OK_COMPLETIONPENDING,
+            gamepad_host.OnResourceMessageReceived(
+                PpapiHostMsg_Gamepad_RequestMemory(),
+                &context));
+
+  // Wait for the gamepad background thread to read twice to make sure we
+  // don't get a message yet (see below for why).
+  MockGamepadDataFetcher* fetcher = service_->data_fetcher();
+  fetcher->WaitForDataRead();
+  fetcher->WaitForDataRead();
+
+  // It should not have sent the callback message.
+  service_->message_loop().RunAllPending();
+  EXPECT_EQ(0u, sink().message_count());
+
+  // Set a button down and wait for it to be read twice.
+  //
+  // We wait for two reads before calling RunAllPending because the provider
+  // will read the data on the background thread (setting the event) and *then*
+  // will issue the callback on our thread. Waiting for it to read twice
+  // ensures that it was able to issue callbacks for the first read (if it
+  // issued one) before we try to check for it.
+  WebKit::WebGamepads button_down_data = default_data;
+  button_down_data.items[0].buttons[0] = 1.f;
+  fetcher->SetTestData(button_down_data);
+  fetcher->WaitForDataRead();
+  fetcher->WaitForDataRead();
+
+  // It should have sent a callback.
+  service_->message_loop().RunAllPending();
+  ppapi::proxy::ResourceMessageReplyParams reply_params;
+  IPC::Message reply_msg;
+  ASSERT_TRUE(sink().GetFirstResourceReplyMatching(
+      PpapiPluginMsg_Gamepad_SendMemory::ID, &reply_params, &reply_msg));
+
+  // Extract the shared memory handle.
+  base::SharedMemoryHandle reply_handle;
+  EXPECT_TRUE(reply_params.GetSharedMemoryHandleAtIndex(0, &reply_handle));
+
+  // Validate the shared memory.
+  base::SharedMemory shared_memory(reply_handle, true);
+  EXPECT_TRUE(shared_memory.Map(sizeof(ppapi::ContentGamepadHardwareBuffer)));
+  const ppapi::ContentGamepadHardwareBuffer* buffer =
+      static_cast<const ppapi::ContentGamepadHardwareBuffer*>(
+          shared_memory.memory());
+  EXPECT_EQ(button_down_data.length, buffer->buffer.length);
+  EXPECT_EQ(button_down_data.items[0].buttonsLength,
+            buffer->buffer.items[0].buttons_length);
+  for (size_t i = 0; i < ppapi::WebKitGamepad::kButtonsLengthCap; i++) {
+    EXPECT_EQ(button_down_data.items[0].buttons[i],
+              buffer->buffer.items[0].buttons[i]);
+  }
+
+  // Duplicate requests should be denied.
+  EXPECT_EQ(PP_ERROR_FAILED,
+            gamepad_host.OnResourceMessageReceived(
+                PpapiHostMsg_Gamepad_RequestMemory(),
+                &context));
+}
+
+}  // namespace content