ozone: demo: Add software support & use message loop

ui/ozone/demo/ozone_demo.cc

Index: ui/ozone/demo/ozone_demo.cc
diff --git a/ui/ozone/demo/ozone_demo.cc b/ui/ozone/demo/ozone_demo.cc
new file mode 100644
index 0000000000000000000000000000000000000000..15d8fc0f344269e54e0211d8bbebc70c3e96c560
--- /dev/null
+++ b/ui/ozone/demo/ozone_demo.cc
@@ -0,0 +1,215 @@
+// Copyright 2014 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 "base/at_exit.h"
+#include "base/command_line.h"
+#include "base/message_loop/message_loop.h"
+#include "base/run_loop.h"
+#include "base/timer/timer.h"
+#include "third_party/skia/include/core/SkCanvas.h"
+#include "third_party/skia/include/core/SkColor.h"
+#include "ui/gfx/geometry/size.h"
+#include "ui/gl/gl_bindings.h"
+#include "ui/gl/gl_context.h"
+#include "ui/gl/gl_surface.h"
+#include "ui/ozone/public/ozone_platform.h"
+#include "ui/ozone/public/surface_factory_ozone.h"
+#include "ui/ozone/public/surface_ozone_canvas.h"
+#include "ui/platform_window/platform_window.h"
+#include "ui/platform_window/platform_window_delegate.h"
+
+const int kTestWindowWidth = 800;
+const int kTestWindowHeight = 600;
+
+const int kFrameDelayMilliseconds = 16;
+
+const int kAnimationSteps = 240;
+
+const char kDisableGpu[] = "disable-gpu";
+
+class DemoWindow : public ui::PlatformWindowDelegate {
+ public:
+  DemoWindow() : widget_(gfx::kNullAcceleratedWidget), iteration_(0) {
+    platform_window_ = ui::OzonePlatform::GetInstance()->CreatePlatformWindow(
+        this, gfx::Rect(kTestWindowWidth, kTestWindowHeight));
+  }
+  virtual ~DemoWindow() {}
+
+  gfx::AcceleratedWidget GetAcceleratedWidget() {
+    // TODO(spang): We should start rendering asynchronously.
+    CHECK_NE(widget_, gfx::kNullAcceleratedWidget)
+        << "Widget not available synchronously";
+    return widget_;
+  }
+
+  gfx::Size GetSize() { return platform_window_->GetBounds().size(); }
+
+  void Start() {
+    if (!CommandLine::ForCurrentProcess()->HasSwitch(kDisableGpu) &&
+        gfx::GLSurface::InitializeOneOff() && InitializeGLSurface()) {
+      StartAnimationGL();
+    } else if (InitializeSoftwareSurface()) {
+      StartAnimationSoftware();
+    } else {
+      LOG(ERROR) << "Failed to create drawing surface";
+      Quit();
+    }
+  }
+
+  void Quit() {
+    StopAnimation();
+    base::MessageLoop::current()->PostTask(
+        FROM_HERE, base::Bind(&base::DeletePointer<DemoWindow>, this));
+   }
+
+  // PlatformWindowDelegate:
+  virtual void OnBoundsChanged(const gfx::Rect& new_bounds) OVERRIDE {}
+  virtual void OnDamageRect(const gfx::Rect& damaged_region) OVERRIDE {}
+  virtual void DispatchEvent(ui::Event* event) OVERRIDE {}
+  virtual void OnCloseRequest() OVERRIDE {
+    Quit();
+  }
+  virtual void OnClosed() OVERRIDE {}
+  virtual void OnWindowStateChanged(
+      ui::PlatformWindowState new_state) OVERRIDE {}
+  virtual void OnLostCapture() OVERRIDE {}
+  virtual void OnAcceleratedWidgetAvailable(
+      gfx::AcceleratedWidget widget) OVERRIDE {
+    CHECK_NE(widget, gfx::kNullAcceleratedWidget);
+    widget_ = widget;
+  }
+  virtual void OnActivationChanged(bool active) OVERRIDE {}
+
+ private:
+  bool InitializeGLSurface() {
+    surface_ = gfx::GLSurface::CreateViewGLSurface(GetAcceleratedWidget());
+    if (!surface_) {
+      LOG(ERROR) << "Failed to create GL surface";
+      return false;
+    }
+
+    context_ = gfx::GLContext::CreateGLContext(
+        NULL, surface_.get(), gfx::PreferIntegratedGpu);
+    if (!context_) {
+      LOG(ERROR) << "Failed to create GL context";
+      surface_ = NULL;
+      return false;
+    }
+
+    surface_->Resize(GetSize());
+
+    if (!context_->MakeCurrent(surface_.get())) {
+      LOG(ERROR) << "Failed to make GL context current";
+      surface_ = NULL;
+      context_ = NULL;
+      return false;
+    }
+
+    return true;
+  }
+
+  bool InitializeSoftwareSurface() {
+    software_surface_ =
+        ui::SurfaceFactoryOzone::GetInstance()->CreateCanvasForWidget(
+            GetAcceleratedWidget());
+    if (!software_surface_) {
+      LOG(ERROR) << "Failed to create software surface";
+      return false;
+    }
+
+    software_surface_->ResizeCanvas(GetSize());
+    return true;
+  }
+
+  void StartAnimationGL() {
+    timer_.Start(FROM_HERE,
+                 base::TimeDelta::FromMicroseconds(kFrameDelayMilliseconds),
+                 this,
+                 &DemoWindow::RenderFrameGL);
+  }
+
+  void StartAnimationSoftware() {
+    timer_.Start(FROM_HERE,
+                 base::TimeDelta::FromMicroseconds(kFrameDelayMilliseconds),
+                 this,
+                 &DemoWindow::RenderFrameSoftware);
+  }
+
+  void StopAnimation() { timer_.Stop(); }
+
+  float NextFraction() {
+    float fraction = (sinf(iteration_ * 2 * M_PI / kAnimationSteps) + 1) / 2;
+
+    iteration_++;
+    iteration_ %= kAnimationSteps;
+
+    return fraction;
+  }
+
+  void RenderFrameGL() {
+    float fraction = NextFraction();
+    gfx::Size window_size = GetSize();
+
+    glViewport(0, 0, window_size.width(), window_size.height());
+    glClearColor(1 - fraction, fraction, 0.0, 1.0);
+    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+
+    if (!surface_->SwapBuffers())
+      LOG(FATAL) << "Failed to swap buffers";
+  }
+
+  void RenderFrameSoftware() {
+    float fraction = NextFraction();
+    gfx::Size window_size = GetSize();
+
+    skia::RefPtr<SkCanvas> canvas = software_surface_->GetCanvas();
+
+    SkColor color =
+        SkColorSetARGB(0xff, 0, 0xff * fraction, 0xff * (1 - fraction));
+
+    canvas->clear(color);
+
+    software_surface_->PresentCanvas(gfx::Rect(window_size));
+  }
+
+  // Timer for animation.
+  base::RepeatingTimer<DemoWindow> timer_;
+
+  // Bits for GL rendering.
+  scoped_refptr<gfx::GLSurface> surface_;
+  scoped_refptr<gfx::GLContext> context_;
+
+  // Bits for software rendeirng.
+  scoped_ptr<ui::SurfaceOzoneCanvas> software_surface_;
+
+  // Window-related state.
+  scoped_ptr<ui::PlatformWindow> platform_window_;
+  gfx::AcceleratedWidget widget_;
+
+  // Animation state.
+  int iteration_;
+
+  DISALLOW_COPY_AND_ASSIGN(DemoWindow);
+};
+
+int main(int argc, char** argv) {
+  CommandLine::Init(argc, argv);
+  base::AtExitManager exit_manager;
+
+  // Build UI thread message loop. This is used by platform
+  // implementations for event polling & running background tasks.
+  base::MessageLoopForUI message_loop;
+
+  ui::OzonePlatform::InitializeForUI();
+
+  DemoWindow* window = new DemoWindow;
+  window->Start();
+
+  // Run the message loop until there's nothing left to do.
+  // TODO(spang): Should we use QuitClosure instead?
+  base::RunLoop run_loop;
+  run_loop.RunUntilIdle();
+
+  return 0;
+}