import type { UICanvasRenderingContext2D } from "../../miscellaneous/canvas";
import type { UITextSpan } from "../../miscellaneous/text-span/UITextSpan";
import { UITextStyle } from "../../miscellaneous/text-style/UITextStyle";
import type { UITextStyleConfig } from "../../miscellaneous/text-style/UITextStyle.Internal";
import type { UIChunkMetrics, UITextChunk, UITextLine, UITextSize } from "./UIText.Interfaces";
/**
 * Applies font of a resolved style to a canvas context.
 * Shared by measuring and rendering so both stay in sync.
 * @param context Canvas context to configure
 * @param textStyle Resolved text style
 */
export declare function applyFontStyle(context: UICanvasRenderingContext2D, textStyle: UITextStyleConfig): void;
/**
 * Splits text into renderable chunks.
 * @param text Text to split
 * @returns Array of words, spaces, and newlines
 */
export declare function splitTextIntoChunks(text: string): string[];
/**
 * Measures single text chunk.
 * @param context Canvas context for measurement
 * @param text Chunk text
 * @param textStyle Resolved text style
 * @returns Chunk metrics
 */
export declare function measureTextChunk(context: UICanvasRenderingContext2D, text: string, textStyle: UITextStyleConfig): UIChunkMetrics;
/**
 * Builds text lines with word wrapping.
 * @param maxWidth Maximum line width in pixels
 * @param textChunks Measured text chunks
 * @returns Array of text lines
 */
export declare function buildTextLines(maxWidth: number, textChunks: UITextChunk[]): UITextLine[];
/**
 * Calculates total text size from lines.
 * The box spans from the ascent of the first line to the descent of the last one.
 * @param lines Text lines
 * @returns Total width and height
 */
export declare function calculateTextSize(lines: UITextLine[]): UITextSize;
/**
 * Builds measured text chunks from spans.
 * @param context Canvas context for measurement
 * @param textSpans Text spans with styles
 * @param commonStyle Fallback style
 * @param isRTL Whether the paragraph reads right to left
 * @returns Measured text chunks
 */
export declare function buildTextChunks(context: UICanvasRenderingContext2D, textSpans: UITextSpan[], commonStyle: UITextStyle, isRTL: boolean): UITextChunk[];
/**
 * Calculates text layout parameters.
 * @param textChunks Measured text chunks
 * @param maxLineWidth Maximum line width in pixels
 * @returns Lines and total size
 */
export declare function calculateTextContentParameters(textChunks: UITextChunk[], maxLineWidth: number): {
    lines: UITextLine[];
    size: UITextSize;
};