performance_overlay_layer.h

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// Copyright 2013 The Flutter 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 FLUTTER_FLOW_LAYERS_PERFORMANCE_OVERLAY_LAYER_H_
#define FLUTTER_FLOW_LAYERS_PERFORMANCE_OVERLAY_LAYER_H_
 
#include <string>
 
#include "flutter/flow/layers/layer.h"
#include "flutter/flow/stopwatch.h"
#include "flutter/fml/macros.h"
 
class SkTextBlob;
 
namespace flutter {
 
const int kDisplayRasterizerStatistics = 1 << 0;
const int kVisualizeRasterizerStatistics = 1 << 1;
const int kDisplayEngineStatistics = 1 << 2;
const int kVisualizeEngineStatistics = 1 << 3;
 
class PerformanceOverlayLayer : public Layer {
 public:
  static SkFont MakeStatisticsFont(std::string_view font_path);
 
  static sk_sp<SkTextBlob> MakeStatisticsText(const Stopwatch& stopwatch,
                                              const SkFont& font,
                                              std::string_view label_prefix);
 
  bool IsReplacing(DiffContext* context, const Layer* layer) const override {
    return layer->as_performance_overlay_layer() != nullptr;
  }
 
  void Diff(DiffContext* context, const Layer* old_layer) override;
 
  const PerformanceOverlayLayer* as_performance_overlay_layer() const override {
    return this;
  }
 
  explicit PerformanceOverlayLayer(uint64_t options,
                                   const char* font_path = nullptr);
 
  void Preroll(PrerollContext* context) override {}
  void Paint(PaintContext& context) const override;
 
 private:
  int options_;
  std::string font_path_;
 
  FML_DISALLOW_COPY_AND_ASSIGN(PerformanceOverlayLayer);
};
 
}  // namespace flutter
 
#endif  // FLUTTER_FLOW_LAYERS_PERFORMANCE_OVERLAY_LAYER_H_