xypath_renderer.h

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#pragma once
 
// #include "fl/assert.h"
// #include "fl/function.h"
// #include "fl/lut.h"
// #include "fl/map_range.h"
// #include "fl/math_macros.h"
// #include "fl/raster.h"
// #include "fl/xypath.h"
#include "fl/function.h"
#include "fl/ptr.h"
#include "fl/tile2x2.h"
#include "fl/transform.h"
 
namespace fl {
 
FASTLED_SMART_PTR(XYPathGenerator);
 
class XYPathRenderer : public Referent {
  public:
    XYPathRenderer(XYPathGeneratorPtr path,
                   TransformFloat transform = TransformFloat());
    vec2f at(float alpha);
 
    Tile2x2_u8 at_subpixel(float alpha);
 
    void rasterize(float from, float to, int steps, XYRasterU8Sparse &raster,
                   fl::function<uint8_t(float)> *optional_alpha_gen = nullptr);
 
    // Overloaded to allow transform to be passed in.
    vec2f at(float alpha, const TransformFloat &tx);
 
    // Needed for drawing to the screen. When this called the rendering will
    // be centered on the width and height such that 0,0 -> maps to .5,.5,
    // which is convenient for drawing since each float pixel can be truncated
    // to an integer type.
    void setDrawBounds(uint16_t width, uint16_t height);
    bool hasDrawBounds() const { return mDrawBoundsSet; }
 
    void onTransformFloatChanged();
 
    TransformFloat &transform();
 
    void setTransform(const TransformFloat &transform) {
        mTransform = transform;
        onTransformFloatChanged();
    }
 
    void setScale(float scale);
 
    vec2f compute(float alpha);
 
  private:
    XYPathGeneratorPtr mPath;
    TransformFloat mTransform;
    TransformFloat mGridTransform;
    bool mDrawBoundsSet = false;
    vec2f compute_float(float alpha, const TransformFloat &tx);
};
 
} // namespace fl