Gradient.h

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#pragma once
 
 
#include <functional>
#include <vector>
 
#include "tiny_skia/Color.h"
#include "tiny_skia/Point.h"
#include "tiny_skia/pipeline/Pipeline.h"
 
namespace tiny_skia {
 
constexpr float kDegenerateThreshold = 1.0f / (1 << 15);
 
struct GradientStop {
  NormalizedF32 position; 
  Color color;            
 
  static GradientStop create(float position, Color color) {
    return GradientStop{NormalizedF32::newClamped(position), color};
  }
};
 
class Gradient {
 public:
  Gradient(std::vector<GradientStop> stops, SpreadMode tileMode, Transform transform,
           Transform pointsToUnit);
 
  [[nodiscard]] bool colorsAreOpaque() const { return colorsAreOpaque_; }
 
  [[nodiscard]] bool pushStages(
      pipeline::RasterPipelineBuilder& p, ColorSpace cs,
      const std::function<void(pipeline::RasterPipelineBuilder&)>& pushStagesPre,
      const std::function<void(pipeline::RasterPipelineBuilder&)>& pushStagesPost) const;
 
  [[nodiscard]] bool tryPushFusedLinear2Stop(pipeline::RasterPipelineBuilder& p,
                                             ColorSpace cs) const;
 
  [[nodiscard]] bool tryPushFusedRadial2Stop(pipeline::RasterPipelineBuilder& p,
                                             ColorSpace cs) const;
 
  void applyOpacity(float opacity);
 
  Transform transform;
 
 private:
  std::vector<GradientStop> stops_;
  SpreadMode tileMode_ = SpreadMode::Pad;
  Transform pointsToUnit_;
  bool colorsAreOpaque_ = true;
  bool hasUniformStops_ = true;
};
 
}  // namespace tiny_skia