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{"version":3,"file":"CanvasTextMetrics.mjs","sources":["../../../../src/scene/text/canvas/CanvasTextMetrics.ts"],"sourcesContent":["import { lru } from 'tiny-lru';\nimport { DOMAdapter } from '../../../environment/adapter';\nimport { measureTaggedText } from './utils/measureTaggedText';\nimport { hasTagMarkup, hasTagStyles, type TextStyleRun } from './utils/parseTaggedText';\nimport { isBreakingSpace as isBreakingSpaceUtil, NEWLINE_MATCH_REGEX } from './utils/textTokenization';\nimport { wordWrap } from './utils/wordWrap';\n\nimport type { ICanvas, ICanvasRenderingContext2DSettings } from '../../../environment/canvas/ICanvas';\nimport type { ICanvasRenderingContext2D } from '../../../environment/canvas/ICanvasRenderingContext2D';\nimport type { TextStyle } from '../TextStyle';\nimport type { FontMetrics } from './utils/types';\n\n// The type for Intl.Segmenter is only available since TypeScript 4.7.2, so let's make a polyfill for it.\ninterface ISegmentData\n{\n segment: string;\n}\ninterface ISegments\n{\n [Symbol.iterator](): IterableIterator<ISegmentData>;\n}\ninterface ISegmenter\n{\n segment(input: string): ISegments;\n}\ninterface IIntl\n{\n Segmenter?: {\n prototype: ISegmenter;\n /**\n * Creates a new Intl.Segmenter object.\n * @returns A new Intl.Segmenter object.\n */\n new(): ISegmenter;\n };\n}\n\n// Default settings used for all getContext calls\nconst contextSettings: ICanvasRenderingContext2DSettings = {\n // TextMetrics requires getImageData readback for measuring fonts.\n willReadFrequently: true,\n};\n\n/**\n * The TextMetrics object represents the measurement of a block of text with a specified style.\n * @example\n * import { CanvasTextMetrics, TextStyle } from 'pixi.js';\n *\n * const style = new TextStyle({\n * fontFamily: 'Arial',\n * fontSize: 24,\n * fill: 0xff1010,\n * align: 'center',\n * });\n * const textMetrics = CanvasTextMetrics.measureText('Your text', style);\n * @category text\n * @advanced\n */\nexport class CanvasTextMetrics\n{\n /** The text that was measured. */\n public text: string;\n\n /** The style that was measured. */\n public style: TextStyle;\n\n /** The measured width of the text. */\n public width: number;\n\n /** The measured height of the text. */\n public height: number;\n\n /** An array of lines of the text broken by new lines and wrapping is specified in style. */\n public lines: string[];\n\n /** An array of the line widths for each line matched to `lines`. */\n public lineWidths: number[];\n\n /** The measured line height for this style. */\n public lineHeight: number;\n\n /** The maximum line width for all measured lines. */\n public maxLineWidth: number;\n\n /** The font properties object from TextMetrics.measureFont. */\n public fontProperties: FontMetrics;\n\n /**\n * Per-line style runs for tagged text rendering.\n * Each element is an array of runs for that line.\n * Only populated when text contains tag markup.\n * @internal\n */\n public runsByLine?: TextStyleRun[][];\n\n /**\n * Per-line ascent values for tagged text with mixed fonts.\n * Represents the max ascent across all runs on each line.\n * Only populated when text contains tag markup.\n * @internal\n */\n public lineAscents?: number[];\n\n /**\n * Per-line descent values for tagged text with mixed fonts.\n * Represents the max descent across all runs on each line.\n * Only populated when text contains tag markup.\n * @internal\n */\n public lineDescents?: number[];\n\n /**\n * Per-line heights for tagged text with mixed fonts.\n * Each line may have different height based on the fonts used.\n * Only populated when text contains tag markup.\n * @internal\n */\n public lineHeights?: number[];\n\n /**\n * Whether any run in the tagged text has a drop shadow.\n * Cached during measurement to avoid per-render iteration.\n * Only populated when text contains tag markup.\n * @internal\n */\n public hasDropShadow?: boolean;\n\n /**\n * String used for calculate font metrics.\n * These characters are all tall to help calculate the height required for text.\n */\n public static METRICS_STRING = '|ÉqÅ';\n\n /** Baseline symbol for calculate font metrics. */\n public static BASELINE_SYMBOL = 'M';\n\n /** Baseline multiplier for calculate font metrics. */\n public static BASELINE_MULTIPLIER = 1.4;\n\n /** Height multiplier for setting height of canvas to calculate font metrics. */\n public static HEIGHT_MULTIPLIER = 2.0;\n\n /**\n * A Unicode \"character\", or \"grapheme cluster\", can be composed of multiple Unicode code points,\n * such as letters with diacritical marks (e.g. `'\\u0065\\u0301'`, letter e with acute)\n * or emojis with modifiers (e.g. `'\\uD83E\\uDDD1\\u200D\\uD83D\\uDCBB'`, technologist).\n * The new `Intl.Segmenter` API in ES2022 can split the string into grapheme clusters correctly. If it is not available,\n * PixiJS will fallback to use the iterator of String, which can only spilt the string into code points.\n * If you want to get full functionality in environments that don't support `Intl.Segmenter` (such as Firefox),\n * you can use other libraries such as [grapheme-splitter]{@link https://www.npmjs.com/package/grapheme-splitter}\n * or [graphemer]{@link https://www.npmjs.com/package/graphemer} to create a polyfill. Since these libraries can be\n * relatively large in size to handle various Unicode grapheme clusters properly, PixiJS won't use them directly.\n */\n public static graphemeSegmenter: (s: string) => string[] = (() =>\n {\n if (typeof (Intl as IIntl)?.Segmenter === 'function')\n {\n const segmenter = new (Intl as IIntl).Segmenter();\n\n return (s: string) =>\n {\n const segments = segmenter.segment(s);\n const result = [];\n\n let i = 0;\n\n for (const segment of segments)\n {\n result[i++] = (segment.segment);\n }\n\n return result;\n };\n }\n\n return (s: string) => [...s];\n })();\n\n public static _experimentalLetterSpacingSupported?: boolean;\n\n /**\n * Checking that we can use modern canvas 2D API.\n *\n * Note: This is an unstable API, Chrome < 94 use `textLetterSpacing`, later versions use `letterSpacing`.\n * @see CanvasTextMetrics.experimentalLetterSpacing\n * @see https://developer.mozilla.org/en-US/docs/Web/API/ICanvasRenderingContext2D/letterSpacing\n * @see https://developer.chrome.com/origintrials/#/view_trial/3585991203293757441\n */\n public static get experimentalLetterSpacingSupported(): boolean\n {\n let result = CanvasTextMetrics._experimentalLetterSpacingSupported;\n\n if (result === undefined)\n {\n const proto = DOMAdapter.get().getCanvasRenderingContext2D().prototype;\n\n result\n = CanvasTextMetrics._experimentalLetterSpacingSupported\n = 'letterSpacing' in proto || 'textLetterSpacing' in proto;\n }\n\n return result;\n }\n\n /**\n * New rendering behavior for letter-spacing which uses Chrome's new native API. This will\n * lead to more accurate letter-spacing results because it does not try to manually draw\n * each character. However, this Chrome API is experimental and may not serve all cases yet.\n * @see CanvasTextMetrics.experimentalLetterSpacingSupported\n */\n public static experimentalLetterSpacing = false;\n\n /** Cache of {@link TextMetrics.FontMetrics} objects. */\n private static _fonts: Record<string, FontMetrics> = {};\n\n // eslint-disable-next-line @typescript-eslint/naming-convention\n private static __canvas: ICanvas;\n // eslint-disable-next-line @typescript-eslint/naming-convention\n private static __context: ICanvasRenderingContext2D;\n\n /** Cache for measured text metrics */\n private static readonly _measurementCache = lru<CanvasTextMetrics>(1000);\n\n /**\n * @param text - the text that was measured\n * @param style - the style that was measured\n * @param width - the measured width of the text\n * @param height - the measured height of the text\n * @param lines - an array of the lines of text broken by new lines and wrapping if specified in style\n * @param lineWidths - an array of the line widths for each line matched to `lines`\n * @param lineHeight - the measured line height for this style\n * @param maxLineWidth - the maximum line width for all measured lines\n * @param fontProperties - the font properties object from TextMetrics.measureFont\n * @param taggedData - optional object containing tagged text specific data\n * @param taggedData.runsByLine - per-line style runs for tagged text\n * @param taggedData.lineAscents - per-line ascent values for tagged text\n * @param taggedData.lineDescents - per-line descent values for tagged text\n * @param taggedData.lineHeights - per-line height values for tagged text\n * @param taggedData.hasDropShadow - whether any run has a drop shadow\n */\n constructor(\n text: string,\n style: TextStyle,\n width: number,\n height: number,\n lines: string[],\n lineWidths: number[],\n lineHeight: number,\n maxLineWidth: number,\n fontProperties: FontMetrics,\n taggedData?: {\n runsByLine?: TextStyleRun[][],\n lineAscents?: number[],\n lineDescents?: number[],\n lineHeights?: number[],\n hasDropShadow?: boolean,\n },\n )\n {\n this.text = text;\n this.style = style;\n this.width = width;\n this.height = height;\n this.lines = lines;\n this.lineWidths = lineWidths;\n this.lineHeight = lineHeight;\n this.maxLineWidth = maxLineWidth;\n this.fontProperties = fontProperties;\n\n if (taggedData)\n {\n this.runsByLine = taggedData.runsByLine;\n this.lineAscents = taggedData.lineAscents;\n this.lineDescents = taggedData.lineDescents;\n this.lineHeights = taggedData.lineHeights;\n this.hasDropShadow = taggedData.hasDropShadow;\n }\n }\n\n /**\n * Measures the supplied string of text and returns a Rectangle.\n * @param text - The text to measure.\n * @param style - The text style to use for measuring\n * @param canvas - optional specification of the canvas to use for measuring.\n * @param wordWrap\n * @returns Measured width and height of the text.\n */\n public static measureText(\n text = ' ',\n style: TextStyle,\n canvas: ICanvas = CanvasTextMetrics._canvas,\n wordWrap: boolean = style.wordWrap,\n ): CanvasTextMetrics\n {\n const textKey = `${text}-${style.styleKey}-wordWrap-${wordWrap}`;\n\n // check if we have already measured this text with the same style\n if (CanvasTextMetrics._measurementCache.has(textKey))\n {\n return CanvasTextMetrics._measurementCache.get(textKey);\n }\n\n // Check if we need to use tagged text measurement\n const isTagged = hasTagStyles(style) && hasTagMarkup(text);\n\n if (isTagged)\n {\n const result = measureTaggedText(\n text,\n style,\n wordWrap,\n CanvasTextMetrics._context,\n CanvasTextMetrics._measureText,\n CanvasTextMetrics.measureFont,\n CanvasTextMetrics.canBreakChars,\n CanvasTextMetrics.wordWrapSplit,\n );\n\n const measurements = new CanvasTextMetrics(\n text,\n style,\n result.width,\n result.height,\n result.lines,\n result.lineWidths,\n result.lineHeight,\n result.maxLineWidth,\n result.fontProperties,\n {\n runsByLine: result.runsByLine,\n lineAscents: result.lineAscents,\n lineDescents: result.lineDescents,\n lineHeights: result.lineHeights,\n hasDropShadow: result.hasDropShadow,\n },\n );\n\n CanvasTextMetrics._measurementCache.set(textKey, measurements);\n\n return measurements;\n }\n\n const font = style._fontString;\n const fontProperties = CanvasTextMetrics.measureFont(font);\n\n // fallback in case UA disallow canvas data extraction\n if (fontProperties.fontSize === 0)\n {\n fontProperties.fontSize = style.fontSize as number;\n fontProperties.ascent = style.fontSize as number;\n fontProperties.descent = 0;\n }\n\n const context = CanvasTextMetrics._context;\n\n context.font = font;\n\n const outputText = wordWrap\n ? CanvasTextMetrics._wordWrap(text, style, canvas)\n : text;\n const lines = outputText.split(NEWLINE_MATCH_REGEX);\n const lineWidths = new Array<number>(lines.length);\n let maxLineWidth = 0;\n\n for (let i = 0; i < lines.length; i++)\n {\n const lineWidth = CanvasTextMetrics._measureText(lines[i], style.letterSpacing, context);\n\n lineWidths[i] = lineWidth;\n maxLineWidth = Math.max(maxLineWidth, lineWidth);\n }\n\n const strokeWidth = style._stroke?.width ?? 0;\n const lineHeight = style.lineHeight || fontProperties.fontSize;\n\n // Calculate base width - use wordWrapWidth for non-left alignment when wrapping\n const baseWidth = CanvasTextMetrics._getAlignWidth(maxLineWidth, style, wordWrap);\n const width = CanvasTextMetrics._adjustWidthForStyle(baseWidth, style);\n\n // Calculate height\n const baseHeight = Math.max(lineHeight, fontProperties.fontSize + strokeWidth)\n + ((lines.length - 1) * (lineHeight + style.leading));\n const height = CanvasTextMetrics._adjustHeightForStyle(baseHeight, style);\n\n const measurements = new CanvasTextMetrics(\n text,\n style,\n width,\n height,\n lines,\n lineWidths,\n lineHeight + style.leading,\n maxLineWidth,\n fontProperties\n );\n\n // cache the measurements\n CanvasTextMetrics._measurementCache.set(textKey, measurements);\n\n return measurements;\n }\n\n /**\n * Adjusts the measured width to account for stroke and drop shadow.\n * @param baseWidth - The base content width\n * @param style - The text style\n * @returns The adjusted width\n */\n private static _adjustWidthForStyle(baseWidth: number, style: TextStyle): number\n {\n const strokeWidth = style._stroke?.width || 0;\n let width = baseWidth + strokeWidth;\n\n if (style.dropShadow)\n {\n width += style.dropShadow.distance;\n }\n\n return width;\n }\n\n /**\n * Adjusts the measured height to account for drop shadow.\n * @param baseHeight - The base content height\n * @param style - The text style\n * @returns The adjusted height\n */\n private static _adjustHeightForStyle(baseHeight: number, style: TextStyle): number\n {\n let height = baseHeight;\n\n if (style.dropShadow)\n {\n height += style.dropShadow.distance;\n }\n\n return height;\n }\n\n /**\n * Calculates the base width for alignment purposes.\n * When word wrap is enabled with center/right alignment, uses wordWrapWidth.\n * @param maxLineWidth - The maximum line width\n * @param style - The text style\n * @param wordWrapEnabled - Whether word wrap is enabled\n * @returns The width to use for alignment calculations\n */\n private static _getAlignWidth(maxLineWidth: number, style: TextStyle, wordWrapEnabled: boolean): number\n {\n const useWrapWidth = wordWrapEnabled && style.align !== 'left';\n\n return useWrapWidth ? Math.max(maxLineWidth, style.wordWrapWidth) : maxLineWidth;\n }\n\n /**\n * Measures the rendered width of a string, accounting for letter spacing and using the provided context.\n * @param text - The text to measure\n * @param letterSpacing - Letter spacing in pixels\n * @param context - Canvas 2D context\n * @returns The measured width of the text with spacing\n * @internal\n */\n public static _measureText(\n text: string,\n letterSpacing: number,\n context: ICanvasRenderingContext2D\n ): number\n {\n let useExperimentalLetterSpacing = false;\n\n if (CanvasTextMetrics.experimentalLetterSpacingSupported)\n {\n if (CanvasTextMetrics.experimentalLetterSpacing)\n {\n context.letterSpacing = `${letterSpacing}px`;\n context.textLetterSpacing = `${letterSpacing}px`;\n useExperimentalLetterSpacing = true;\n }\n else\n {\n context.letterSpacing = '0px';\n context.textLetterSpacing = '0px';\n }\n }\n\n const metrics = context.measureText(text);\n let metricWidth = metrics.width;\n const actualBoundingBoxLeft = -(metrics.actualBoundingBoxLeft ?? 0);\n const actualBoundingBoxRight = metrics.actualBoundingBoxRight ?? 0;\n let boundsWidth = actualBoundingBoxRight - actualBoundingBoxLeft;\n\n if (metricWidth > 0)\n {\n if (useExperimentalLetterSpacing)\n {\n metricWidth -= letterSpacing;\n boundsWidth -= letterSpacing;\n }\n else\n {\n const val = (CanvasTextMetrics.graphemeSegmenter(text).length - 1) * letterSpacing;\n\n metricWidth += val;\n boundsWidth += val;\n }\n }\n\n // NOTE: this is a bit of a hack as metrics.width and the bounding box width do not measure the same thing\n // We can't seem to exclusively use one or the other, so are taking the largest of the two\n return Math.max(metricWidth, boundsWidth);\n }\n\n /**\n * Applies newlines to a string to have it optimally fit into the horizontal\n * bounds set by the Text object's wordWrapWidth property.\n * @param text - String to apply word wrapping to\n * @param style - the style to use when wrapping\n * @param canvas - optional specification of the canvas to use for measuring.\n * @returns New string with new lines applied where required\n */\n private static _wordWrap(\n text: string,\n style: TextStyle,\n canvas: ICanvas = CanvasTextMetrics._canvas\n ): string\n {\n return wordWrap(\n text,\n style,\n canvas,\n CanvasTextMetrics._measureText,\n CanvasTextMetrics.canBreakWords,\n CanvasTextMetrics.canBreakChars,\n CanvasTextMetrics.wordWrapSplit,\n );\n }\n\n /**\n * Determines if char is a breaking whitespace.\n *\n * It allows one to determine whether char should be a breaking whitespace\n * For example certain characters in CJK langs or numbers.\n * It must return a boolean.\n * @param char - The character\n * @param [_nextChar] - The next character\n * @returns True if whitespace, False otherwise.\n */\n public static isBreakingSpace(char: string, _nextChar?: string): boolean\n {\n return isBreakingSpaceUtil(char, _nextChar);\n }\n\n /**\n * Overridable helper method used internally by TextMetrics, exposed to allow customizing the class's behavior.\n *\n * It allows one to customise which words should break\n * Examples are if the token is CJK or numbers.\n * It must return a boolean.\n * @param _token - The token\n * @param breakWords - The style attr break words\n * @returns Whether to break word or not\n */\n public static canBreakWords(_token: string, breakWords: boolean): boolean\n {\n return breakWords;\n }\n\n /**\n * Overridable helper method used internally by TextMetrics, exposed to allow customizing the class's behavior.\n *\n * It allows one to determine whether a pair of characters\n * should be broken by newlines\n * For example certain characters in CJK langs or numbers.\n * It must return a boolean.\n * @param _char - The character\n * @param _nextChar - The next character\n * @param _token - The token/word the characters are from\n * @param _index - The index in the token of the char\n * @param _breakWords - The style attr break words\n * @returns whether to break word or not\n */\n public static canBreakChars(_char: string, _nextChar: string, _token: string, _index: number,\n _breakWords: boolean): boolean\n {\n return true;\n }\n\n /**\n * Overridable helper method used internally by TextMetrics, exposed to allow customizing the class's behavior.\n *\n * It is called when a token (usually a word) has to be split into separate pieces\n * in order to determine the point to break a word.\n * It must return an array of characters.\n * @param token - The token to split\n * @returns The characters of the token\n * @see CanvasTextMetrics.graphemeSegmenter\n */\n public static wordWrapSplit(token: string): string[]\n {\n return CanvasTextMetrics.graphemeSegmenter(token);\n }\n\n /**\n * Calculates the ascent, descent and fontSize of a given font-style\n * @param font - String representing the style of the font\n * @returns Font properties object\n */\n public static measureFont(font: string): FontMetrics\n {\n // as this method is used for preparing assets, don't recalculate things if we don't need to\n if (CanvasTextMetrics._fonts[font])\n {\n return CanvasTextMetrics._fonts[font];\n }\n\n const context = CanvasTextMetrics._context;\n\n context.font = font;\n const metrics = context.measureText(CanvasTextMetrics.METRICS_STRING + CanvasTextMetrics.BASELINE_SYMBOL);\n\n const ascent = metrics.actualBoundingBoxAscent ?? 0;\n const descent = metrics.actualBoundingBoxDescent ?? 0;\n\n const properties = {\n ascent,\n descent,\n fontSize: ascent + descent\n };\n\n CanvasTextMetrics._fonts[font] = properties;\n\n return properties;\n }\n\n /**\n * Clear font metrics in metrics cache.\n * @param {string} [font] - font name. If font name not set then clear cache for all fonts.\n */\n public static clearMetrics(font = ''): void\n {\n if (font)\n {\n delete CanvasTextMetrics._fonts[font];\n }\n else\n {\n CanvasTextMetrics._fonts = {};\n }\n }\n\n /**\n * Cached canvas element for measuring text\n * TODO: this should be private, but isn't because of backward compat, will fix later.\n * @ignore\n */\n public static get _canvas(): ICanvas\n {\n if (!CanvasTextMetrics.__canvas)\n {\n let canvas: ICanvas;\n\n try\n {\n // OffscreenCanvas2D measureText can be up to 40% faster.\n const c = new OffscreenCanvas(0, 0);\n const context = c.getContext('2d', contextSettings);\n\n if (context?.measureText)\n {\n CanvasTextMetrics.__canvas = c as ICanvas;\n\n return c as ICanvas;\n }\n\n canvas = DOMAdapter.get().createCanvas();\n }\n catch (_cx)\n {\n canvas = DOMAdapter.get().createCanvas();\n }\n canvas.width = canvas.height = 10;\n CanvasTextMetrics.__canvas = canvas;\n }\n\n return CanvasTextMetrics.__canvas;\n }\n\n /**\n * TODO: this should be private, but isn't because of backward compat, will fix later.\n * @ignore\n */\n public static get _context(): ICanvasRenderingContext2D\n {\n if (!CanvasTextMetrics.__context)\n {\n CanvasTextMetrics.__context = CanvasTextMetrics._canvas.getContext('2d', contextSettings);\n }\n\n return CanvasTextMetrics.__context;\n 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