fabric
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Object model for HTML5 canvas, and SVG-to-canvas parser. Backed by jsdom and node-canvas.
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{"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"}