{"version":3,"file":"cache.min.mjs","names":[],"sources":["../../src/cache.ts"],"sourcesContent":["import { config } from './config';\nimport type { TRectBounds } from './typedefs';\n\ntype TextCouplesCache = Map</** char */ string, /** width */ number>;\n\ntype FamilyCache = Map</** fontStyleCacheKey */ string, TextCouplesCache>;\n\nexport class Cache {\n  /**\n   * Cache of widths of chars in text rendering.\n   */\n  declare charWidthsCache: Map</** fontFamily */ string, FamilyCache>;\n\n  constructor() {\n    this.charWidthsCache = new Map();\n  }\n\n  /**\n   * @return {Object} reference to cache\n   */\n  getFontCache({\n    fontFamily,\n    fontStyle,\n    fontWeight,\n  }: {\n    fontFamily: string;\n    fontStyle: string;\n    fontWeight: string | number;\n  }): TextCouplesCache {\n    fontFamily = fontFamily.toLowerCase();\n    const cache = this.charWidthsCache;\n    if (!cache.has(fontFamily)) {\n      cache.set(fontFamily, new Map<string, TextCouplesCache>());\n    }\n    const fontCache = cache.get(fontFamily)!;\n    const cacheKey = `${fontStyle.toLowerCase()}_${(\n      fontWeight + ''\n    ).toLowerCase()}`;\n    if (!fontCache.has(cacheKey)) {\n      fontCache.set(cacheKey, new Map<string, number>());\n    }\n    return fontCache.get(cacheKey)!;\n  }\n\n  /**\n   * Clear char widths cache for the given font family or all the cache if no\n   * fontFamily is specified.\n   * Use it if you know you are loading fonts in a lazy way and you are not waiting\n   * for custom fonts to load properly when adding text objects to the canvas.\n   * If a text object is added when its own font is not loaded yet, you will get wrong\n   * measurement and so wrong bounding boxes.\n   * After the font cache is cleared, either change the textObject text content or call\n   * initDimensions() to trigger a recalculation\n   * @param {String} [fontFamily] font family to clear\n   */\n  clearFontCache(fontFamily?: string) {\n    if (!fontFamily) {\n      this.charWidthsCache = new Map();\n    } else {\n      this.charWidthsCache.delete((fontFamily || '').toLowerCase());\n    }\n  }\n\n  /**\n   * Given current aspect ratio, determines the max width and height that can\n   * respect the total allowed area for the cache.\n   * @param {number} ar aspect ratio\n   * @return {number[]} Limited dimensions X and Y\n   */\n  limitDimsByArea(ar: number) {\n    const { perfLimitSizeTotal } = config;\n    const roughWidth = Math.sqrt(perfLimitSizeTotal * ar);\n    // we are not returning a point on purpose, to avoid circular dependencies\n    // this is an internal utility\n    return [\n      Math.floor(roughWidth),\n      Math.floor(perfLimitSizeTotal / roughWidth),\n    ];\n  }\n\n  /**\n   * This object keeps the results of the boundsOfCurve calculation mapped by the joined arguments necessary to calculate it.\n   * It does speed up calculation, if you parse and add always the same paths, but in case of heavy usage of freedrawing\n   * you do not get any speed benefit and you get a big object in memory.\n   * The object was a private variable before, while now is appended to the lib so that you have access to it and you\n   * can eventually clear it.\n   * It was an internal variable, is accessible since version 2.3.4\n   */\n  boundsOfCurveCache: Record<string, TRectBounds> = {};\n}\n\nexport const cache = new Cache();\n"],"mappings":"qJA2FA,MAAa,EAAQ,IApFrB,KAAA,CAME,aAAA,CAAA,EAAA,KA2EA,qBAAkD,EAAA,CAAA,CA1EhD,KAAK,gBAAkB,IAAI,IAM7B,aAAA,CAAa,WACX,EAAA,UACA,EAAA,WACA,GAAA,CAMA,EAAa,EAAW,aAAA,CACxB,IAAM,EAAQ,KAAK,gBACd,EAAM,IAAI,EAAA,EACb,EAAM,IAAI,EAAY,IAAI,IAAA,CAE5B,IAAM,EAAY,EAAM,IAAI,EAAA,CACtB,EAAW,GAAG,EAAU,aAAA,CAAA,IAC5B,EAAa,IACb,aAAA,GAIF,OAHK,EAAU,IAAI,EAAA,EACjB,EAAU,IAAI,EAAU,IAAI,IAAA,CAEvB,EAAU,IAAI,EAAA,CAcvB,eAAe,EAAA,CACR,EAGH,KAAK,gBAAgB,QAAQ,GAAc,IAAI,aAAA,CAAA,CAF/C,KAAK,gBAAkB,IAAI,IAY/B,gBAAgB,EAAA,CACd,GAAA,CAAM,mBAAE,GAAuB,EACzB,EAAa,KAAK,KAAK,EAAqB,EAAA,CAGlD,MAAO,CACL,KAAK,MAAM,EAAA,CACX,KAAK,MAAM,EAAqB,EAAA,CAAA,GAAA,OAAA,KAAA"}