/** The two edges of a warp at one horizontal position, `0`…`1` down the box. */
export interface WarpEdges {
    readonly top: number;
    readonly bottom: number;
}
/**
 * Whether a preset bends text at all. `textNoShape` is the "no warp" member of
 * the enumeration and by far its most common value — two thirds of the decks
 * that mention a warp state only this one — and a body carrying it is an
 * ordinary text box, NOT WordArt stretched to its shape.
 *
 * @param preset The `a:prstTxWarp @prst` value.
 * @returns Whether {@link textWarpEdges} can bend text through this preset.
 */
export declare function isTextWarp(preset: string): boolean;
/**
 * Where a warped body's two frames sit on the page: the shape's box, which the
 * warped text is stretched onto, and the box the UN-warped block occupies.
 * Both are in the page's top-left frame, y growing down.
 */
export interface WarpFrame {
    readonly preset: string;
    readonly adjust?: number;
    readonly boxX: number;
    readonly boxY: number;
    readonly boxWidth: number;
    readonly boxHeight: number;
    readonly srcX: number;
    readonly srcWidth: number;
    readonly srcTop: number;
    readonly srcHeight: number;
}
/**
 * The matrix that places one glyph of a warped body.
 *
 * Maps the glyph's own text space — x along its advance, y UP from its
 * baseline — into the page's top-left frame, as `[a, b, c, d, e, f]` with
 * `px = a·x + c·y + e` and `py = b·x + d·y + f`. Upright text therefore has a
 * negative `d`: the glyph's y runs against the page's.
 *
 * @param frame     The two frames, from the laid-out line.
 * @param glyphX    The glyph's left edge in the un-warped block.
 * @param advance   How wide the glyph is there.
 * @param baselineY The line's baseline in the un-warped block.
 * @returns The six numbers, or `undefined` where the warp leaves no room to
 *          draw — the pinched end of a fade, or a preset this file cannot bend.
 */
export declare function warpGlyphMatrix(frame: WarpFrame, glyphX: number, advance: number, baselineY: number): readonly [number, number, number, number, number, number] | undefined;
/**
 * The two edges of a warp at one position across its box.
 *
 * @param preset The `a:prstTxWarp @prst` value.
 * @param u      Position across the box, `0` at its left edge and `1` at its right.
 * @param adj    The `a:avLst` `adj` guide in hundred-thousandths, when the file states one.
 * @returns The top and bottom edges, `0`…`1` down the box, or `undefined` for a
 *          preset this file does not bend (an unknown name, or `textNoShape`).
 */
export declare function textWarpEdges(preset: string, u: number, adj?: number): WarpEdges | undefined;