Initial commit of the blimp/ folder and target

blimp/client/compositor/blimp_compositor.h

Index: blimp/client/compositor/blimp_compositor.h
diff --git a/blimp/client/compositor/blimp_compositor.h b/blimp/client/compositor/blimp_compositor.h
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+// Copyright 2015 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.
+
+#ifndef BLIMP_CLIENT_COMPOSITOR_BLIMP_COMPOSITOR_H_
+#define BLIMP_CLIENT_COMPOSITOR_BLIMP_COMPOSITOR_H_
+
+#include "base/macros.h"
+#include "base/memory/ref_counted.h"
+#include "base/memory/scoped_ptr.h"
+#include "cc/trees/layer_tree_host_client.h"
+#include "cc/trees/layer_tree_settings.h"
+#include "ui/gfx/geometry/size.h"
+#include "ui/gfx/native_widget_types.h"
+
+namespace base {
+class SingleThreadTaskRunner;
+class Thread;
+}
+
+namespace cc {
+class LayerTreeHost;
+}
+
+namespace blimp {
+
+// BlimpCompositor provides the basic framework and setup to host a
+// LayerTreeHost (compositor).  The rendering surface this compositor draws to
+// is defined by the gfx::AcceleratedWidget returned by
+// BlimpCompositor::GetWindow().
+class BlimpCompositor : public cc::LayerTreeHostClient {
+ public:
+  ~BlimpCompositor() override;
+
+  void SetVisible(bool visible);
+  void SetSize(const gfx::Size& size);
+
+  // LayerTreeHostClient implementation.
+  void WillBeginMainFrame() override;
+  void DidBeginMainFrame() override;
+  void BeginMainFrame(const cc::BeginFrameArgs& args) override;
+  void BeginMainFrameNotExpectedSoon() override;
+  void Layout() override;
+  void ApplyViewportDeltas(const gfx::Vector2dF& inner_delta,
+                           const gfx::Vector2dF& outer_delta,
+                           const gfx::Vector2dF& elastic_overscroll_delta,
+                           float page_scale,
+                           float top_controls_delta) override;
+  void RequestNewOutputSurface() override;
+  void DidInitializeOutputSurface() override;
+  void DidFailToInitializeOutputSurface() override;
+  void WillCommit() override;
+  void DidCommit() override;
+  void DidCommitAndDrawFrame() override;
+  void DidCompleteSwapBuffers() override;
+  void DidCompletePageScaleAnimation() override;
+  void RecordFrameTimingEvents(
+      scoped_ptr<cc::FrameTimingTracker::CompositeTimingSet> composite_events,
+      scoped_ptr<cc::FrameTimingTracker::MainFrameTimingSet> main_frame_events)
+      override;
+
+ protected:
+  // |dp_to_px| is the scale factor required to move from dp (device pixels) to
+  // px.
+  explicit BlimpCompositor(float dp_to_px);
+
+  // Returns a widget for use in constructing this compositor's OutputSurface.
+  // Will only ever be called while this compositor is visible.
+  virtual gfx::AcceleratedWidget GetWindow() = 0;
+
+  // Populates the cc::LayerTreeSettings used by the cc::LayerTreeHost.  Can be
+  // overridden to provide custom settings parameters.
+  virtual void GenerateLayerTreeSettings(cc::LayerTreeSettings* settings);
+
+ private:
+  // Creates (if necessary) and returns a TaskRunner for a thread meant to run
+  // compositor rendering.
+  scoped_refptr<base::SingleThreadTaskRunner> GetCompositorTaskRunner();
+
+  gfx::Size viewport_size_;
+
+  // The scale factor used to convert dp units (device independent pixels) to
+  // pixels.
+  float device_scale_factor_;
+  scoped_ptr<cc::LayerTreeHost> host_;
+  scoped_ptr<cc::LayerTreeSettings> settings_;
+
+  // Lazily created thread that will run the compositor rendering tasks.
+  scoped_ptr<base::Thread> compositor_thread_;
+
+  DISALLOW_COPY_AND_ASSIGN(BlimpCompositor);
+};
+
+}  // namespace blimp
+
+#endif  // BLIMP_CLIENT_COMPOSITOR_BLIMP_COMPOSITOR_H_