dl_complexity_helper.cc

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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.
 
#include "flutter/display_list/benchmarking/dl_complexity_helper.h"
 
#include "flutter/display_list/geometry/dl_path.h"
 
namespace {
 
using DlPoint = flutter::DlPoint;
using DlScalar = flutter::DlScalar;
 
class DlComplexityPathReceiver : public flutter::DlPathReceiver {
 public:
  void MoveTo(const DlPoint& p2, bool will_be_closed) override {}
  void LineTo(const DlPoint& p2) override { line_verb_count++; }
  void QuadTo(const DlPoint& cp, const DlPoint& p2) override {
    quad_verb_count++;
  }
  bool ConicTo(const DlPoint& cp, const DlPoint& p2, DlScalar weight) override {
    conic_verb_count++;
    return true;
  }
  void CubicTo(const DlPoint& cp1,
               const DlPoint& cp2,
               const DlPoint& p2) override {
    cubic_verb_count++;
  }
  void Close() override {}
 
  uint32_t line_verb_count;
  uint32_t quad_verb_count;
  uint32_t conic_verb_count;
  uint32_t cubic_verb_count;
};
 
}  // namespace
 
namespace flutter {
 
unsigned int ComplexityCalculatorHelper::CalculatePathComplexity(
    const DlPath& dl_path,
    unsigned int line_verb_cost,
    unsigned int quad_verb_cost,
    unsigned int conic_verb_cost,
    unsigned int cubic_verb_cost) {
  DlComplexityPathReceiver receiver;
  dl_path.Dispatch(receiver);
  return (line_verb_cost * receiver.line_verb_count) +
         (quad_verb_cost * receiver.quad_verb_count) +
         (conic_verb_cost * receiver.conic_verb_count) +
         (cubic_verb_cost * receiver.cubic_verb_count);
}
 
}  // namespace flutter