examples/sky_compositor_app/sky_compositor_app.cc

// 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/macros.h"
#include "mojo/application/application_runner_chromium.h"
#include "mojo/public/c/system/main.h"
#include "mojo/public/cpp/application/application_connection.h"
#include "mojo/public/cpp/application/application_delegate.h"
#include "mojo/public/cpp/application/application_impl.h"
#include "mojo/services/view_manager/public/cpp/view.h"
#include "mojo/services/view_manager/public/cpp/view_manager.h"
#include "mojo/services/view_manager/public/cpp/view_manager_client_factory.h"
#include "mojo/services/view_manager/public/cpp/view_manager_delegate.h"
#include "sky/compositor/layer.h"
#include "sky/compositor/layer_host.h"
#include "sky/compositor/rasterizer_ganesh.h"
#include "third_party/skia/include/core/SkCanvas.h"

namespace examples {
namespace {

gfx::Size ToSize(const mojo::Rect& rect) {
  return gfx::Size(rect.width, rect.height);
}

int RadiusAt(base::TimeDelta delta) {
  return 50 + (delta.InMilliseconds() % 6000) * 100 / 6000;
}
}

class SkyCompositorApp : public mojo::ApplicationDelegate,
                         public mojo::ViewManagerDelegate,
                         public sky::LayerClient,
                         public sky::LayerHostClient {
 public:
  SkyCompositorApp() : shell_(nullptr), view_(nullptr) {}
  ~SkyCompositorApp() override {}

  void Initialize(mojo::ApplicationImpl* app) override {
    shell_ = app->shell();
    view_manager_client_factory_.reset(
        new mojo::ViewManagerClientFactory(app->shell(), this));
  }

  bool ConfigureIncomingConnection(
      mojo::ApplicationConnection* connection) override {
    connection->AddService(view_manager_client_factory_.get());
    return true;
  }

  void OnEmbed(mojo::View* root,
               mojo::InterfaceRequest<mojo::ServiceProvider> services,
               mojo::ServiceProviderPtr exposed_services) override {
    view_ = root;
    base_time_ = base::TimeTicks::Now();

    layer_host_.reset(new sky::LayerHost(this));
    root_layer_ = make_scoped_refptr(new sky::Layer(this));
    root_layer_->set_rasterizer(
        make_scoped_ptr(new sky::RasterizerGanesh(layer_host_.get())));
    layer_host_->SetRootLayer(root_layer_);
    layer_host_->SetNeedsAnimate();
  }

  void OnViewManagerDisconnected(mojo::ViewManager* view_manager) override {
    mojo::ApplicationImpl::Terminate();
  }

 private:
  // sky::LayerHostClient
  mojo::Shell* GetShell() override { return shell_; }

  void BeginFrame(base::TimeTicks frame_time) override {
    root_layer_->SetSize(ToSize(view_->bounds()));
    layer_host_->SetNeedsAnimate();
  }

  void OnSurfaceIdAvailable(mojo::SurfaceIdPtr surface_id) override {
    view_->SetSurfaceId(surface_id.Pass());
  }

  // sky::LayerClient
  void PaintContents(SkCanvas* canvas, const gfx::Rect& clip) override {
    base::TimeTicks frame_time = base::TimeTicks::Now();
    printf("Frame delta: %f\n",
           (frame_time - last_frame_time_).InMillisecondsF());
    last_frame_time_ = frame_time;

    canvas->clear(SK_ColorGREEN);
    SkPaint paint;
    paint.setColor(SK_ColorBLUE);
    paint.setFlags(SkPaint::kAntiAlias_Flag);
    canvas->drawCircle(50, 100, RadiusAt(frame_time - base_time_), paint);
  }

  mojo::Shell* shell_;
  scoped_ptr<mojo::ViewManagerClientFactory> view_manager_client_factory_;
  mojo::View* view_;

  scoped_ptr<sky::LayerHost> layer_host_;
  scoped_refptr<sky::Layer> root_layer_;

  base::TimeTicks base_time_;
  base::TimeTicks last_frame_time_;

  DISALLOW_COPY_AND_ASSIGN(SkyCompositorApp);
};

}  // namespace examples

MojoResult MojoMain(MojoHandle handle) {
  mojo::ApplicationRunnerChromium runner(new examples::SkyCompositorApp);
  return runner.Run(handle);
}