stroke_path_geometry.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_IMPELLER_ENTITY_GEOMETRY_STROKE_PATH_GEOMETRY_H_
#define FLUTTER_IMPELLER_ENTITY_GEOMETRY_STROKE_PATH_GEOMETRY_H_
 
#include "impeller/entity/geometry/geometry.h"
#include "impeller/geometry/matrix.h"
 
namespace impeller {
 
/// @brief A geometry that is created from a stroked path object.
class StrokePathGeometry final : public Geometry {
 public:
  StrokePathGeometry(const Path& path,
                     Scalar stroke_width,
                     Scalar miter_limit,
                     Cap stroke_cap,
                     Join stroke_join);
 
  ~StrokePathGeometry() override;
 
  Scalar GetStrokeWidth() const;
 
  Scalar GetMiterLimit() const;
 
  Cap GetStrokeCap() const;
 
  Join GetStrokeJoin() const;
 
  Scalar ComputeAlphaCoverage(const Matrix& transform) const override;
 
 private:
  // |Geometry|
  GeometryResult GetPositionBuffer(const ContentContext& renderer,
                                   const Entity& entity,
                                   RenderPass& pass) const override;
 
  // |Geometry|
  GeometryResult::Mode GetResultMode() const override;
 
  // |Geometry|
  std::optional<Rect> GetCoverage(const Matrix& transform) const override;
 
  // Private for benchmarking and debugging
  static std::vector<SolidFillVertexShader::PerVertexData>
  GenerateSolidStrokeVertices(const Path::Polyline& polyline,
                              Scalar stroke_width,
                              Scalar miter_limit,
                              Join stroke_join,
                              Cap stroke_cap,
                              Scalar scale);
 
  friend class ImpellerBenchmarkAccessor;
  friend class ImpellerEntityUnitTestAccessor;
 
  bool SkipRendering() const;
 
  Path path_;
  Scalar stroke_width_;
  Scalar miter_limit_;
  Cap stroke_cap_;
  Join stroke_join_;
 
  StrokePathGeometry(const StrokePathGeometry&) = delete;
 
  StrokePathGeometry& operator=(const StrokePathGeometry&) = delete;
};
 
}  // namespace impeller
 
#endif  // FLUTTER_IMPELLER_ENTITY_GEOMETRY_STROKE_PATH_GEOMETRY_H_