[Chromoting] Unit Tests for GlRenderer

remoting/client/gl_renderer_unittest.cc

Index: remoting/client/gl_renderer_unittest.cc
diff --git a/remoting/client/gl_renderer_unittest.cc b/remoting/client/gl_renderer_unittest.cc
new file mode 100644
index 0000000000000000000000000000000000000000..999d6e25a7ac51269150bf49a6f427b66df3ecd3
--- /dev/null
+++ b/remoting/client/gl_renderer_unittest.cc
@@ -0,0 +1,224 @@
+// Copyright 2016 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 "remoting/client/gl_renderer.h"
+
+#include "base/bind.h"
+#include "base/bind_helpers.h"
+#include "base/memory/ptr_util.h"
+#include "base/message_loop/message_loop.h"
+#include "base/run_loop.h"
+#include "base/threading/thread_task_runner_handle.h"
+#include "remoting/client/gl_renderer_core.h"
+#include "remoting/client/gl_renderer_delegate.h"
+#include "testing/gtest/include/gtest/gtest.h"
+#include "third_party/webrtc/modules/desktop_capture/desktop_frame.h"
+
+namespace remoting {
+
+class FakeGlRendererCore : public GlRendererCore {
+ public:
+  FakeGlRendererCore() {}
+  ~FakeGlRendererCore() override {}
+  void CreateCanvas(int gl_version) override {}
+  void DestroyCanvas() override {}
+  bool DrawFrame() override {
+    return false;
+  }
+  void SetPixelTransformation(const std::array<float, 9>& matrix) override {}
+  void MoveCursor(int x, int y) override {}
+  void StartFeedbackAnimation(int x, int y, float diameter) override {}
+  void SetCursorVisibility(bool visible) override {}
+  void SetDesktopFrame(const webrtc::DesktopFrame& frame) override {}
+  void SetCursorShape(const protocol::CursorShapeInfo& shape) override {}
+  void SetViewSize(int width, int height) override {}
+  void SetCanvasSize(int width, int height) override {
+    canvas_width_ = width;
+    canvas_height_ = height;
+  }
+  int GetCanvasWidth() const override {
+    return canvas_width_;
+  }
+  int GetCanvasHeight() const override {
+    return canvas_height_;
+  }
+
+ private:
+  int canvas_width_ = 0;
+  int canvas_height_ = 0;
+};
+
+// static
+std::unique_ptr<GlRendererCore> GlRendererCore::CreateCore() {
+  return base::WrapUnique(new FakeGlRendererCore());
+}
+
+class FakeGlRendererDelegate : public GlRendererDelegate {
+ public:
+  FakeGlRendererDelegate() : weak_factory_(this) {}
+
+  bool CanRenderFrame() override {
+    can_render_frame_call_count_++;
+    return can_render_frame_;
+  }
+
+  void OnFrameRendered() override {
+    on_frame_rendered_call_count_++;
+    if (on_frame_rendered_callback_) {
+      on_frame_rendered_callback_.Run();
+    }
+  }
+
+  void OnSizeChanged(int width, int height) override {
+    canvas_width_ = width;
+    canvas_height_ = height;
+    on_size_changed_call_count_++;
+  }
+
+  void SetOnFrameRenderedCallback(const base::Closure& callback) {
+    on_frame_rendered_callback_ = callback;
+  }
+
+  base::WeakPtr<FakeGlRendererDelegate> GetWeakPtr() {
+    return weak_factory_.GetWeakPtr();
+  }
+
+  bool can_render_frame_ = false;
+  int can_render_frame_call_count_ = 0;
+  int on_frame_rendered_call_count_ = 0;
+  int on_size_changed_call_count_ = 0;
+
+  int canvas_width_ = 0;
+  int canvas_height_ = 0;
+ private:
+  base::Closure on_frame_rendered_callback_;
+
+  base::WeakPtrFactory<FakeGlRendererDelegate> weak_factory_;
+};
+
+class GlRendererTest : public testing::Test {
+ public:
+  void SetUp() override;
+  void SetDesktopFrameWithSize(const webrtc::DesktopSize& size);
+  void PostSetDesktopFrameTasks(const webrtc::DesktopSize& size, int count);
+
+ protected:
+  void OnDesktopFrameProcessed();
+  void RunTasksInCurrentQueue();
+  void RunUntilRendered();
+
+  std::unique_ptr<GlRenderer> renderer_;
+  FakeGlRendererDelegate delegate_;
+  base::MessageLoop message_loop_;
+  int on_desktop_frame_processed_call_count_ = 0;
+};
+
+void GlRendererTest::SetUp() {
+  renderer_.reset(new GlRenderer());
+  renderer_->SetDelegate(delegate_.GetWeakPtr());
+}
+
+void GlRendererTest::SetDesktopFrameWithSize(const webrtc::DesktopSize& size) {
+  renderer_->OnFrameReceived(
+      base::WrapUnique(
+          new webrtc::BasicDesktopFrame(size)),
+      base::Bind(&GlRendererTest::OnDesktopFrameProcessed,
+                 base::Unretained(this)));
+}
+
+void GlRendererTest::PostSetDesktopFrameTasks(
+    const webrtc::DesktopSize& size, int count) {
+  for (int i = 0; i < count; i++) {
+    message_loop_.task_runner()->PostTask(
+        FROM_HERE, base::Bind(&GlRendererTest::SetDesktopFrameWithSize,
+                              base::Unretained(this), size));
+  }
+}
+
+void GlRendererTest::OnDesktopFrameProcessed() {
+  on_desktop_frame_processed_call_count_++;
+}
+
+void GlRendererTest::RunTasksInCurrentQueue() {
+  base::RunLoop run_loop;
+  message_loop_.task_runner()->PostTask(FROM_HERE, run_loop.QuitClosure());
+  run_loop.Run();
+}
+
+void GlRendererTest::RunUntilRendered() {
+  base::RunLoop run_loop;
+  delegate_.SetOnFrameRenderedCallback(run_loop.QuitClosure());
+  run_loop.Run();
+}
+
+
+TEST_F(GlRendererTest, TestDelegateCanRenderFrame) {
+  delegate_.can_render_frame_ = true;
+  renderer_->RequestRender();
+  RunTasksInCurrentQueue();
+  EXPECT_EQ(1, delegate_.can_render_frame_call_count_);
+  EXPECT_EQ(1, delegate_.on_frame_rendered_call_count_);
+
+  delegate_.can_render_frame_ = false;
+  renderer_->RequestRender();
+  RunTasksInCurrentQueue();
+  EXPECT_EQ(2, delegate_.can_render_frame_call_count_);
+  EXPECT_EQ(1, delegate_.on_frame_rendered_call_count_);
+}
+
+TEST_F(GlRendererTest, TestRequestRenderOnlyScheduleOnce) {
+  delegate_.can_render_frame_ = true;
+
+  renderer_->RequestRender();
+  renderer_->RequestRender();
+  renderer_->RequestRender();
+  RunTasksInCurrentQueue();
+  EXPECT_EQ(1, delegate_.can_render_frame_call_count_);
+  EXPECT_EQ(1, delegate_.on_frame_rendered_call_count_);
+
+  renderer_->RequestRender();
+  RunTasksInCurrentQueue();
+  EXPECT_EQ(2, delegate_.can_render_frame_call_count_);
+  EXPECT_EQ(2, delegate_.on_frame_rendered_call_count_);
+}
+
+TEST_F(GlRendererTest, TestDelegateOnSizeChanged) {
+  SetDesktopFrameWithSize(webrtc::DesktopSize(16, 16));
+  EXPECT_EQ(1, delegate_.on_size_changed_call_count_);
+  EXPECT_EQ(16, delegate_.canvas_width_);
+  EXPECT_EQ(16, delegate_.canvas_height_);
+
+  SetDesktopFrameWithSize(webrtc::DesktopSize(16, 16));
+  EXPECT_EQ(1, delegate_.on_size_changed_call_count_);
+  EXPECT_EQ(16, delegate_.canvas_width_);
+  EXPECT_EQ(16, delegate_.canvas_height_);
+
+  SetDesktopFrameWithSize(webrtc::DesktopSize(32, 32));
+  EXPECT_EQ(2, delegate_.on_size_changed_call_count_);
+  EXPECT_EQ(32, delegate_.canvas_width_);
+  EXPECT_EQ(32, delegate_.canvas_height_);
+
+  renderer_->RequestCanvasSize();
+  EXPECT_EQ(3, delegate_.on_size_changed_call_count_);
+  EXPECT_EQ(32, delegate_.canvas_width_);
+  EXPECT_EQ(32, delegate_.canvas_height_);
+}
+
+TEST_F(GlRendererTest, TestOnFrameReceivedDoneCallbacks) {
+  delegate_.can_render_frame_ = true;
+
+  // Implicitly calls RequestRender().
+
+  PostSetDesktopFrameTasks(webrtc::DesktopSize(16, 16), 1);
+  RunUntilRendered();
+  EXPECT_EQ(1, delegate_.on_frame_rendered_call_count_);
+  EXPECT_EQ(1, on_desktop_frame_processed_call_count_);
+
+  PostSetDesktopFrameTasks(webrtc::DesktopSize(16, 16), 20);
+  RunUntilRendered();
+  EXPECT_EQ(2, delegate_.on_frame_rendered_call_count_);
+  EXPECT_EQ(21, on_desktop_frame_processed_call_count_);
+}
+
+}  // namespace remoting