RadialGradient.h

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#pragma once
 
 
#include <optional>
#include <variant>
#include <vector>
 
#include "tiny_skia/shaders/Gradient.h"
 
namespace tiny_skia {
 
struct FocalData {
  float r1 = 0.0f;
  float focalX = 0.0f;
  bool isSwapped = false;
 
  [[nodiscard]] bool isFocalOnCircle() const;
  [[nodiscard]] bool isWellBehaved() const;
  [[nodiscard]] bool isNativelyFocal() const;
 
  bool set(float r0, float r1, Transform& matrix);
};
 
struct RadialType {
  float radius1 = 0.0f;
  float radius2 = 0.0f;
};
 
struct StripType {
  float scaledR0 = 0.0f;
};
 
using GradientType = std::variant<RadialType, StripType, FocalData>;
 
class RadialGradient {
 public:
  explicit RadialGradient(Gradient base) : base_(std::move(base)) {}
 
  static std::optional<std::variant<Color, RadialGradient>> create(
      Point startPoint, float startRadius, Point endPoint, float endRadius,
      std::vector<GradientStop> stops, SpreadMode mode, Transform transform);
 
  [[nodiscard]] bool isOpaque() const { return base_.colorsAreOpaque(); }
 
  [[nodiscard]] bool pushStages(ColorSpace cs, pipeline::RasterPipelineBuilder& p) const;
 
  Gradient base_;
 
 private:
  static std::optional<std::variant<Color, RadialGradient>> createRadialUnchecked(
      Point center, float radius, std::vector<GradientStop> stops, SpreadMode mode,
      Transform transform);
 
  static std::optional<std::variant<Color, RadialGradient>> createTwoPoint(
      Point c0, float r0, Point c1, float r1, std::vector<GradientStop> stops, SpreadMode mode,
      Transform transform);
 
  GradientType gradientType_;
};
 
}  // namespace tiny_skia