xypath_renderer.cpp.hpp

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#include "fl/math/math.h"
 
#include "fl/stl/assert.h"
#include "fl/log/log.h"
#include "fl/gfx/xypath.h"
#include "fl/gfx/xypath_renderer.h"
#include "fl/gfx/splat.h"
#include "fl/stl/noexcept.h"
 
namespace fl {
 
XYPathRenderer::XYPathRenderer(XYPathGeneratorPtr path,
                               TransformFloat transform)
    FL_NO_EXCEPT : mPath(path), mTransform(transform) {}
 
vec2f XYPathRenderer::compute_float(float alpha, const TransformFloat &tx) FL_NO_EXCEPT {
    vec2f xy = mPath->compute(alpha);
    vec2f out = tx.transform(xy);
    out = mGridTransform.transform(out);
    return out;
}
 
Tile2x2_u8 XYPathRenderer::at_subpixel(float alpha) FL_NO_EXCEPT {
    // 1) continuous point, in “pixel‐centers” coordinates [0.5 … W–0.5]
    if (!mDrawBoundsSet) {
        FL_WARN("XYPathRenderer::at_subpixel: draw bounds not set");
        return Tile2x2_u8();
    }
    vec2f xy = at(alpha);
 
    // 1) shift back so whole‐pixels go 0…W–1, 0…H–1
    xy.x -= 0.5f;
    xy.y -= 0.5f;
 
    return splat(xy);
}
 
} // namespace fl