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14 KiB
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14 KiB
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{"version":3,"sources":["../../src/base83.ts","../../src/utils.ts","../../src/error.ts","../../src/decode.ts","../../src/encode.ts"],"sourcesContent":["const digitCharacters = [\n \"0\",\n \"1\",\n \"2\",\n \"3\",\n \"4\",\n \"5\",\n \"6\",\n \"7\",\n \"8\",\n \"9\",\n \"A\",\n \"B\",\n \"C\",\n \"D\",\n \"E\",\n \"F\",\n \"G\",\n \"H\",\n \"I\",\n \"J\",\n \"K\",\n \"L\",\n \"M\",\n \"N\",\n \"O\",\n \"P\",\n \"Q\",\n \"R\",\n \"S\",\n \"T\",\n \"U\",\n \"V\",\n \"W\",\n \"X\",\n \"Y\",\n \"Z\",\n \"a\",\n \"b\",\n \"c\",\n \"d\",\n \"e\",\n \"f\",\n \"g\",\n \"h\",\n \"i\",\n \"j\",\n \"k\",\n \"l\",\n \"m\",\n \"n\",\n \"o\",\n \"p\",\n \"q\",\n \"r\",\n \"s\",\n \"t\",\n \"u\",\n \"v\",\n \"w\",\n \"x\",\n \"y\",\n \"z\",\n \"#\",\n \"$\",\n \"%\",\n \"*\",\n \"+\",\n \",\",\n \"-\",\n \".\",\n \":\",\n \";\",\n \"=\",\n \"?\",\n \"@\",\n \"[\",\n \"]\",\n \"^\",\n \"_\",\n \"{\",\n \"|\",\n \"}\",\n \"~\",\n];\n\nexport const decode83 = (str: String) => {\n let value = 0;\n for (let i = 0; i < str.length; i++) {\n const c = str[i];\n const digit = digitCharacters.indexOf(c);\n value = value * 83 + digit;\n }\n return value;\n};\n\nexport const encode83 = (n: number, length: number): string => {\n var result = \"\";\n for (let i = 1; i <= length; i++) {\n let digit = (Math.floor(n) / Math.pow(83, length - i)) % 83;\n result += digitCharacters[Math.floor(digit)];\n }\n return result;\n};\n","export const sRGBToLinear = (value: number) => {\n let v = value / 255;\n if (v <= 0.04045) {\n return v / 12.92;\n } else {\n return Math.pow((v + 0.055) / 1.055, 2.4);\n }\n};\n\nexport const linearTosRGB = (value: number) => {\n let v = Math.max(0, Math.min(1, value));\n if (v <= 0.0031308) {\n return Math.trunc(v * 12.92 * 255 + 0.5);\n } else {\n return Math.trunc((1.055 * Math.pow(v, 1 / 2.4) - 0.055) * 255 + 0.5);\n }\n};\n\nexport const sign = (n: number) => (n < 0 ? -1 : 1);\n\nexport const signPow = (val: number, exp: number) =>\n sign(val) * Math.pow(Math.abs(val), exp);\n","export class ValidationError extends Error {\n constructor(message: string) {\n super(message);\n this.name = \"ValidationError\";\n this.message = message;\n }\n}\n","import { decode83 } from \"./base83\";\nimport { sRGBToLinear, signPow, linearTosRGB } from \"./utils\";\nimport { ValidationError } from \"./error\";\n\n/**\n * Returns an error message if invalid or undefined if valid\n * @param blurhash\n */\nconst validateBlurhash = (blurhash: string) => {\n if (!blurhash || blurhash.length < 6) {\n throw new ValidationError(\n \"The blurhash string must be at least 6 characters\"\n );\n }\n\n const sizeFlag = decode83(blurhash[0]);\n const numY = Math.floor(sizeFlag / 9) + 1;\n const numX = (sizeFlag % 9) + 1;\n\n if (blurhash.length !== 4 + 2 * numX * numY) {\n throw new ValidationError(\n `blurhash length mismatch: length is ${\n blurhash.length\n } but it should be ${4 + 2 * numX * numY}`\n );\n }\n};\n\nexport const isBlurhashValid = (\n blurhash: string\n): { result: boolean; errorReason?: string } => {\n try {\n validateBlurhash(blurhash);\n } catch (error) {\n return { result: false, errorReason: error.message };\n }\n\n return { result: true };\n};\n\nconst decodeDC = (value: number) => {\n const intR = value >> 16;\n const intG = (value >> 8) & 255;\n const intB = value & 255;\n return [sRGBToLinear(intR), sRGBToLinear(intG), sRGBToLinear(intB)];\n};\n\nconst decodeAC = (value: number, maximumValue: number) => {\n const quantR = Math.floor(value / (19 * 19));\n const quantG = Math.floor(value / 19) % 19;\n const quantB = value % 19;\n\n const rgb = [\n signPow((quantR - 9) / 9, 2.0) * maximumValue,\n signPow((quantG - 9) / 9, 2.0) * maximumValue,\n signPow((quantB - 9) / 9, 2.0) * maximumValue,\n ];\n\n return rgb;\n};\n\nconst decode = (\n blurhash: string,\n width: number,\n height: number,\n punch?: number\n) => {\n validat
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