/**
 * Text Clip Renderer
 *
 * Implements `background-clip: text` — paints the element's background
 * (color + images) to an offscreen canvas and clips it to the text glyph
 * shapes with destination-in compositing, then composites the result back
 * onto the main canvas.
 *
 * Extracted from CanvasRenderer to keep paint orchestration separate from
 * this self-contained compositing algorithm.
 *
 * The offscreen and mask canvases are backed at device-pixel resolution
 * (bounds × scale) with their contexts scaled to CSS pixels, so the
 * composite back onto the main canvas maps 1:1 onto the backing store and
 * stays sharp at devicePixelRatio > 1.
 *
 * Matching browser paint order for clipped text:
 * - text shadows render *beneath* the clipped background (silhouettes in
 *   the shadow colour), they are not part of the clip region;
 * - -webkit-text-stroke is part of the clip region (fill ∪ stroke band).
 */
import { ElementPaint } from '../stacking-context';
import { CSSParsedDeclaration } from '../../css';
import { Context } from '../../core/context';
export interface TextClipRendererDependencies {
    /** Main canvas context the clipped background is composited onto. */
    ctx: CanvasRenderingContext2D;
    context: Context;
    /** Device-pixel ratio shared with the main renderer. */
    scale: number;
    /** Font builder shared with the text renderer so both use identical fonts. */
    createFontStyle: (styles: CSSParsedDeclaration) => string[];
}
export declare class TextClipRenderer {
    private readonly ctx;
    private readonly context;
    private readonly scale;
    private readonly createFontStyle;
    constructor(deps: TextClipRendererDependencies);
    render(paint: ElementPaint): Promise<void>;
    private createLayer;
    private createGlyphLayer;
    /**
     * Draw one text bound onto a glyph layer, splitting into per-glyph draws
     * when letter-spacing is in effect so the layout matches the main text
     * renderer. Vertical writing modes fall back to a single draw call.
     */
    private drawGlyphs;
    /**
     * Paint the text-shadow silhouettes for every glyph, one canvas per
     * shadow, returned front-to-back (the last shadow sits deepest). Returns
     * null when the element has no text shadows.
     */
    private renderShadowSilhouettes;
}