import { GpuFragmentParams, KitTexture } from '../../contract';

/** Where a slot's raster sits, in atlas UV: left, top, width, height. Zero size = nothing. */
export type AtlasRect = [number, number, number, number];
export interface GlyphAtlasSlot {
    /** Show the top-left `width`×`height` of `source` (white glyphs on transparent). */
    set(source: HTMLCanvasElement, width: number, height: number): void;
    /** Show nothing. */
    clear(): void;
}
export interface GlyphAtlas {
    readonly kit: KitTexture;
    /** A slot for one layer's raster; `onRect` hears where it sits whenever that changes. */
    slot(onRect: (rect: AtlasRect) => void): GlyphAtlasSlot;
}
/** The composition's glyph atlas (created on first use, shared by every caller). */
export declare function glyphAtlasFor(params: GpuFragmentParams): GlyphAtlas;
/**
 * Shelf-pack slots (tallest first) into the narrowest power-of-two width that keeps the atlas
 * roughly square. Returns null when they can't fit within `maxAxis`.
 */
export declare function packSlots(sizes: Array<{
    w: number;
    h: number;
}>, maxAxis: number): {
    width: number;
    height: number;
    positions: Array<{
        x: number;
        y: number;
    }>;
} | null;
//# sourceMappingURL=glyphAtlas.d.ts.map