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fabric

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

fabricjs.com

fabricjs/fabric.js

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{"version":3,"file":"cache.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":";;;AAOA,IAAa,QAAb,MAAmB;CAMjB,cAAc;;;;;;;;;;;GA2Ed;GAAkD,EAAE;GAAC;AA1EnD,OAAK,kCAAkB,IAAI,KAAK;;;;;CAMlC,aAAa,EACX,YACA,WACA,cAKmB;AACnB,eAAa,WAAW,aAAa;EACrC,MAAM,QAAQ,KAAK;AACnB,MAAI,CAAC,MAAM,IAAI,WAAW,CACxB,OAAM,IAAI,4BAAY,IAAI,KAA+B,CAAC;EAE5D,MAAM,YAAY,MAAM,IAAI,WAAW;EACvC,MAAM,WAAW,GAAG,UAAU,aAAa,CAAC,IAC1C,aAAa,IACb,aAAa;AACf,MAAI,CAAC,UAAU,IAAI,SAAS,CAC1B,WAAU,IAAI,0BAAU,IAAI,KAAqB,CAAC;AAEpD,SAAO,UAAU,IAAI,SAAS;;;;;;;;;;;;;CAchC,eAAe,YAAqB;AAClC,MAAI,CAAC,WACH,MAAK,kCAAkB,IAAI,KAAK;MAEhC,MAAK,gBAAgB,QAAQ,cAAc,IAAI,aAAa,CAAC;;;;;;;;CAUjE,gBAAgB,IAAY;EAC1B,MAAM,EAAE,uBAAuB;EAC/B,MAAM,aAAa,KAAK,KAAK,qBAAqB,GAAG;AAGrD,SAAO,CACL,KAAK,MAAM,WAAW,EACtB,KAAK,MAAM,qBAAqB,WAAW,CAC5C;;;AAcL,MAAa,QAAQ,IAAI,OAAO"}