import { Expr, GpuFragmentParams } from '../../gpu/contract';
import { PropRef } from '../values';
import { ArgSpec } from '../invoke';

/** A generator paint: the composition builder a `role: 'generator'` definition runs. */
export type Paint = (params: GpuFragmentParams) => Expr;
/** The {@link strokedSegment} noun's slots. */
export interface StrokedSegmentSlots {
    /** The segment endpoints (position props). */
    from: PropRef;
    to: PropRef;
    /** Stroke thickness in canvas-height units. */
    width: ArgSpec;
    /** Line style as a runtime mode number (solid 0 / dashed 1 / dotted 2). */
    style: ArgSpec;
    /** Dash length (including caps) and the gap between dashes / spacing between dots. */
    dashLength: ArgSpec;
    gapLength: ArgSpec;
    /** Cap shape per end as a runtime mode number (square 0 / rounded 1). */
    capStart: ArgSpec;
    capEnd: ArgSpec;
    /** The stroke color prop. */
    color: PropRef;
}
/**
 * A straight stroked segment between two points: per-end square/rounded caps, and dash/dot
 * patterns rescaled to land exactly on both endpoints. Antialiased with a ~1px device-space
 * feather at any thickness; degenerate (coincident) endpoints render a single cap-shaped point.
 */
export declare function strokedSegment(slots: StrokedSegmentSlots): Paint;
/** The {@link sineStroke} noun's slots. */
export interface SineStrokeSlots {
    /** The wave's center (a position prop) and rotation in degrees. */
    position: PropRef;
    angle: ArgSpec;
    /** Cycle count across the frame and wave height. */
    frequency: ArgSpec;
    amplitude: ArgSpec;
    /** Band thickness and edge softness of the stroke. */
    thickness: ArgSpec;
    softness: ArgSpec;
    /** The stroke color prop. */
    color: PropRef;
}
/**
 * A traveling sine-wave stroke: a soft band of `thickness`/`softness` around an animated sine
 * centered on `position` and rotated by `angle`. Reads the definition's per-node animated time
 * (declare `animatedTime: {speed: ...}` on the definition).
 */
export declare function sineStroke(slots: SineStrokeSlots): Paint;
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