fabric/dist/src/filters/Gamma.min.mjs.map

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

{"version":3,"file":"Gamma.min.mjs","sources":["../../../src/filters/Gamma.ts"],"sourcesContent":["import { BaseFilter } from './BaseFilter';\nimport { classRegistry } from '../ClassRegistry';\nimport { fragmentSource } from './shaders/gamma';\nimport type { T2DPipelineState, TWebGLUniformLocationMap } from './typedefs';\n\nconst GAMMA = 'Gamma' as const;\n\nexport type GammaInput = [number, number, number];\n\nexport type GammaOwnProps = {\n  gamma: GammaInput;\n};\n\nexport const gammaDefaultValues: GammaOwnProps = {\n  gamma: [1, 1, 1],\n};\n\n/**\n * Gamma filter class\n * @example\n * const filter = new Gamma({\n *   gamma: [1, 0.5, 2.1]\n * });\n * object.filters.push(filter);\n * object.applyFilters();\n */\nexport class Gamma extends BaseFilter<typeof GAMMA, GammaOwnProps> {\n  /**\n   * Gamma array value, from 0.01 to 2.2.\n   * @param {Array} gamma\n   * @default\n   */\n  declare gamma: GammaOwnProps['gamma'];\n  declare rgbValues?: {\n    r: Uint8Array;\n    g: Uint8Array;\n    b: Uint8Array;\n  };\n\n  static type = GAMMA;\n\n  static defaults = gammaDefaultValues;\n\n  static uniformLocations = ['uGamma'];\n\n  getFragmentSource() {\n    return fragmentSource;\n  }\n\n  constructor(options: { gamma?: GammaInput } = {}) {\n    super(options);\n    this.gamma =\n      options.gamma ||\n      ((\n        this.constructor as typeof Gamma\n      ).defaults.gamma.concat() as GammaInput);\n  }\n\n  /**\n   * Apply the Gamma operation to a Uint8Array representing the pixels of an image.\n   *\n   * @param {Object} options\n   * @param {ImageData} options.imageData The Uint8Array to be filtered.\n   */\n  applyTo2d({ imageData: { data } }: T2DPipelineState) {\n    const gamma = this.gamma,\n      rInv = 1 / gamma[0],\n      gInv = 1 / gamma[1],\n      bInv = 1 / gamma[2];\n\n    if (!this.rgbValues) {\n      this.rgbValues = {\n        r: new Uint8Array(256),\n        g: new Uint8Array(256),\n        b: new Uint8Array(256),\n      };\n    }\n\n    // This is an optimization - pre-compute a look-up table for each color channel\n    // instead of performing these pow calls for each pixel in the image.\n    const rgb = this.rgbValues;\n    for (let i = 0; i < 256; i++) {\n      rgb.r[i] = Math.pow(i / 255, rInv) * 255;\n      rgb.g[i] = Math.pow(i / 255, gInv) * 255;\n      rgb.b[i] = Math.pow(i / 255, bInv) * 255;\n    }\n    for (let i = 0; i < data.length; i += 4) {\n      data[i] = rgb.r[data[i]];\n      data[i + 1] = rgb.g[data[i + 1]];\n      data[i + 2] = rgb.b[data[i + 2]];\n    }\n  }\n\n  /**\n   * Send data from this filter to its shader program's uniforms.\n   *\n   * @param {WebGLRenderingContext} gl The GL canvas context used to compile this filter's shader.\n   * @param {Object} uniformLocations A map of string uniform names to WebGLUniformLocation objects\n   */\n  sendUniformData(\n    gl: WebGLRenderingContext,\n    uniformLocations: TWebGLUniformLocationMap,\n  ) {\n    gl.uniform3fv(uniformLocations.uGamma, this.gamma);\n  }\n\n  isNeutralState() {\n    const { gamma } = this;\n    return gamma[0] === 1 && gamma[1] === 1 && gamma[2] === 1;\n  }\n\n  toObject(): { type: typeof GAMMA; gamma: GammaInput } {\n    return {\n      type: GAMMA,\n      gamma: this.gamma.concat() as GammaInput,\n    };\n  }\n}\n\nclassRegistry.setClass(Gamma);\n"],"names":["GAMMA","gammaDefaultValues","gamma","Gamma","BaseFilter","getFragmentSource","fragmentSource","constructor","options","arguments","length","undefined","super","this","defaults","concat","applyTo2d","_ref","imageData","data","rInv","gInv","bInv","rgbValues","r","Uint8Array","g","b","rgb","i","Math","pow","sendUniformData","gl","uniformLocations","uniform3fv","uGamma","isNeutralState","toObject","type","_defineProperty","classRegistry","setClass"],"mappings":"sPAKA,MAAMA,EAAQ,QAQDC,EAAoC,CAC/CC,MAAO,CAAC,EAAG,EAAG,IAYT,MAAMC,UAAcC,EAmBzBC,iBAAAA,GACE,OAAOC,CACT,CAEAC,WAAAA,GAAkD,IAAtCC,EAA+BC,UAAAC,OAAA,QAAAC,IAAAF,UAAA,GAAAA,UAAA,GAAG,CAAA,EAC5CG,MAAMJ,GACNK,KAAKX,MACHM,EAAQN,OAENW,KAAKN,YACLO,SAASZ,MAAMa,QACrB,CAQAC,SAAAA,CAASC,GAA4C,IAAzCC,WAAWC,KAAEA,IAA0BF,EACjD,MAAMf,EAAQW,KAAKX,MACjBkB,EAAO,EAAIlB,EAAM,GACjBmB,EAAO,EAAInB,EAAM,GACjBoB,EAAO,EAAIpB,EAAM,GAEdW,KAAKU,YACRV,KAAKU,UAAY,CACfC,EAAG,IAAIC,WAAW,KAClBC,EAAG,IAAID,WAAW,KAClBE,EAAG,IAAIF,WAAW,OAMtB,MAAMG,EAAMf,KAAKU,UACjB,IAAK,IAAIM,EAAI,EAAGA,EAAI,IAAKA,IACvBD,EAAIJ,EAAEK,GAA+B,IAA1BC,KAAKC,IAAIF,EAAI,IAAKT,GAC7BQ,EAAIF,EAAEG,GAA+B,IAA1BC,KAAKC,IAAIF,EAAI,IAAKR,GAC7BO,EAAID,EAAEE,GAA+B,IAA1BC,KAAKC,IAAIF,EAAI,IAAKP,GAE/B,IAAK,IAAIO,EAAI,EAAGA,EAAIV,EAAKT,OAAQmB,GAAK,EACpCV,EAAKU,GAAKD,EAAIJ,EAAEL,EAAKU,IACrBV,EAAKU,EAAI,GAAKD,EAAIF,EAAEP,EAAKU,EAAI,IAC7BV,EAAKU,EAAI,GAAKD,EAAID,EAAER,EAAKU,EAAI,GAEjC,CAQAG,eAAAA,CACEC,EACAC,GAEAD,EAAGE,WAAWD,EAAiBE,OAAQvB,KAAKX,MAC9C,CAEAmC,cAAAA,GACE,MAAMnC,MAAEA,GAAUW,KAClB,OAAoB,IAAbX,EAAM,IAAyB,IAAbA,EAAM,IAAyB,IAAbA,EAAM,EACnD,CAEAoC,QAAAA,GACE,MAAO,CACLC,KAAMvC,EACNE,MAAOW,KAAKX,MAAMa,SAEtB,EAzFAyB,EADWrC,EAAK,OAaFH,GAAKwC,EAbRrC,EAAK,WAeEF,GAAkBuC,EAfzBrC,EAiBe,mBAAA,CAAC,WA4E7BsC,EAAcC,SAASvC"}