flow/compositor_context.h

// 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 FLOW_COMPOSITOR_CONTEXT_H_
#define FLOW_COMPOSITOR_CONTEXT_H_

#include <memory>
#include <string>

#include "flow/instrumentation.h"
#include "flow/raster_cache.h"
#include "lib/ftl/macros.h"
#include "third_party/skia/include/core/SkCanvas.h"
#include "third_party/skia/include/core/SkPictureRecorder.h"

namespace flow {

class CompositorContext {
 public:
  class ScopedFrame {
   public:
    SkCanvas& canvas() { return *canvas_; }
    CompositorContext& context() const { return context_; }
    GrContext* gr_context() const { return gr_context_; }

    ScopedFrame(ScopedFrame&& frame);
    ~ScopedFrame();

   private:
    CompositorContext& context_;
    GrContext* gr_context_;
    SkCanvas* canvas_;
    const bool instrumentation_enabled_;

    ScopedFrame(CompositorContext& context,
                GrContext* gr_context,
                SkCanvas& canvas,
                bool instrumentation_enabled);

    friend class CompositorContext;

    FTL_DISALLOW_COPY_AND_ASSIGN(ScopedFrame);
  };

  CompositorContext();
  ~CompositorContext();

  ScopedFrame AcquireFrame(GrContext* gr_context,
                           SkCanvas& canvas,
                           bool instrumentation_enabled = true);

  void OnGrContextDestroyed();

  RasterCache& raster_cache() { return raster_cache_; }
  const Counter& frame_count() const { return frame_count_; }
  const Stopwatch& frame_time() const { return frame_time_; }
  Stopwatch& engine_time() { return engine_time_; };

 private:
  RasterCache raster_cache_;

  Counter frame_count_;
  Stopwatch frame_time_;
  Stopwatch engine_time_;

  void BeginFrame(ScopedFrame& frame, bool enable_instrumentation);
  void EndFrame(ScopedFrame& frame, bool enable_instrumentation);

  FTL_DISALLOW_COPY_AND_ASSIGN(CompositorContext);
};

}  // namespace flow

#endif  // FLOW_COMPOSITOR_CONTEXT_H_