/** @ignore */ /** */
import type { IBounds } from "../../util/IBounds";
import type { ITextStyle } from "../backend/Renderer";
import type { Color } from "../../util/Color";
/**
 * What text layout measures with. A canvas 2D context in the chart's DOM is
 * one: it resolves relative font sizes (`em`) against the page like the layer
 * canvases do.
 *
 * @ignore
 */
export interface ITextMeasureContext {
    font: string;
    save(): void;
    restore(): void;
    measureText(text: string): TextMetrics;
}
/**
 * Style fields text layout reads beyond `ITextStyle`.
 *
 * @ignore
 */
export interface ILayoutTextStyle extends ITextStyle {
    fillOpacity?: number;
    ignoreFormatting?: boolean;
}
/**
 * @ignore
 */
export interface ILineChunk {
    style: string | undefined;
    fill: Color | undefined;
    text: string;
    width: number;
    height: number;
    left: number;
    right: number;
    ascent: number;
    offsetX: number;
    offsetY: number;
    textDecoration: string | undefined;
    verticalAlign?: "baseline" | "sub" | "super";
}
/**
 * @ignore
 */
export interface ILine {
    offsetY: number;
    ascent: number;
    width: number;
    height: number;
    left: number;
    right: number;
    textChunks: Array<ILineChunk>;
}
/**
 * Layout results that belong to the text's display object. Layout reads the
 * current values and updates them in place.
 *
 * @ignore
 */
export interface ITextLayoutState {
    lines: Array<ILine>;
    textVisible: boolean;
    truncated?: boolean;
    scale: number;
    originalScale?: number;
}
/**
 * CSS font string for `style`, overridden by `style2` (a rich-text format).
 *
 * @ignore
 */
export declare function getFontStyle(style: ITextStyle, style2: ITextStyle | undefined, ignoreFontWeight: boolean, inheritedFontFamily: () => string): string;
/**
 * A font size as CSS: a plain number, also one in a string (`"8"`), is in
 * pixels.
 *
 * @ignore
 */
export declare function fontSizeToCSS(fontSize: string | number): string;
/**
 * Safari measures without the font weight.
 *
 * @ignore
 */
export declare function ignoreFontWeight(): boolean;
/**
 * Measures `text` in the context's current font. Horizontal extents follow
 * `style.textAlign`.
 *
 * @ignore
 */
export declare function measureText(text: string, context: ITextMeasureContext, style: ITextStyle): TextMetrics;
/**
 * @ignore
 */
export declare function fitRatio(style: ITextStyle, bounds: IBounds, horizontalOnly?: boolean): number;
/**
 * @ignore
 */
export declare function truncateText(context: ITextMeasureContext, style: ITextStyle, text: string, maxWidth: number, breakWords?: boolean, fallbackBreakWords?: boolean): string;
/**
 * Lays out regular text: rich-text chunks, wrapping, truncation, line
 * metrics and the oversized behavior. The context must already carry the
 * base font and alignment.
 *
 * @ignore
 */
export declare function layoutText(context: ITextMeasureContext, text: string, style: ILayoutTextStyle, fontOf: (format: ITextStyle) => string, state: ITextLayoutState): IBounds;
/**
 * Lays out circular text one glyph at a time. The context must already carry
 * the base font.
 *
 * @ignore
 */
export declare function layoutCircularText(context: ITextMeasureContext, text: string, style: ILayoutTextStyle, fontOf: (format: ITextStyle) => string, state: ITextLayoutState): IBounds;
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