/**
 * CPU screen↔box-local coordinate mapping.
 *
 * The GPU-side UV transforms (layer transform, bounding-box clip, resize-fit generator UV) live
 * in `gpu/kit/uvTransform.ts`. This module keeps only the plain-number screen↔box-local mapping
 * used by the renderer's mouse-position driver and the Design Editor's position handles, so GPU
 * content, mouse tracking, and drag handles all place a point at exactly the same screen location.
 */
/**
 * Box geometry for the CPU screen↔box-local mapping below. UV fractions, renderer Y-down
 * convention; rotation in degrees; aspectRatio = canvas width / height.
 */
export interface BoxLocalGeometry {
    centerX: number;
    centerY: number;
    halfWidthUV: number;
    halfHeightUV: number;
    rotationDeg: number;
    aspectRatio: number;
}
/**
 * CPU/JS mirror of the resize-fit generator UV mapping the GPU applies, in plain numbers. Used by
 * the renderer's mouse-position driver and the Design Editor's position handles so all three
 * (GPU content, mouse tracking, drag handles) agree.
 *
 * Rotation is aspect-corrected (rotate in AR-scaled space, never raw UV) so rotated non-square
 * boxes don't shear. Reduces to identity at a full-canvas box. screenUVToBoxLocal and
 * boxLocalToScreenUV are exact inverses.
 *
 * Screen-UV point (Y-down) → box-local fraction [0,1] (Y-down).
 */
export declare const screenUVToBoxLocal: (sx: number, sy: number, g: BoxLocalGeometry) => {
    x: number;
    y: number;
};
/** Box-local fraction [0,1] (Y-down) → screen-UV point (Y-down). Inverse of screenUVToBoxLocal. */
export declare const boxLocalToScreenUV: (bx: number, by: number, g: BoxLocalGeometry) => {
    x: number;
    y: number;
};
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