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

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

{"version":3,"file":"Grayscale.min.mjs","sources":["../../../src/filters/Grayscale.ts"],"sourcesContent":["import { BaseFilter } from './BaseFilter';\nimport type { T2DPipelineState, TWebGLUniformLocationMap } from './typedefs';\nimport { classRegistry } from '../ClassRegistry';\nimport { fragmentSource } from './shaders/grayscale';\n\nexport type TGrayscaleMode = 'average' | 'lightness' | 'luminosity';\n\ntype GrayscaleOwnProps = {\n  mode: TGrayscaleMode;\n};\n\nexport const grayscaleDefaultValues: GrayscaleOwnProps = {\n  mode: 'average',\n};\n\n/**\n * Grayscale image filter class\n * @example\n * const filter = new Grayscale();\n * object.filters.push(filter);\n * object.applyFilters();\n */\nexport class Grayscale extends BaseFilter<'Grayscale', GrayscaleOwnProps> {\n  declare mode: TGrayscaleMode;\n\n  static type = 'Grayscale';\n\n  static defaults = grayscaleDefaultValues;\n\n  static uniformLocations = ['uMode'];\n\n  /**\n   * Apply the Grayscale 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    for (let i = 0, value: number; i < data.length; i += 4) {\n      const r = data[i];\n      const g = data[i + 1];\n      const b = data[i + 2];\n      switch (this.mode) {\n        case 'average':\n          value = (r + g + b) / 3;\n          break;\n        case 'lightness':\n          value = (Math.min(r, g, b) + Math.max(r, g, b)) / 2;\n          break;\n        case 'luminosity':\n          value = 0.21 * r + 0.72 * g + 0.07 * b;\n          break;\n      }\n\n      data[i + 2] = data[i + 1] = data[i] = value;\n    }\n  }\n\n  getCacheKey() {\n    return `${this.type}_${this.mode}`;\n  }\n\n  getFragmentSource() {\n    return fragmentSource[this.mode];\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    const mode = 1;\n    gl.uniform1i(uniformLocations.uMode, mode);\n  }\n\n  /**\n   * Grayscale filter isNeutralState implementation\n   * The filter is never neutral\n   * on the image\n   **/\n  isNeutralState() {\n    return false;\n  }\n}\n\nclassRegistry.setClass(Grayscale);\n"],"names":["grayscaleDefaultValues","mode","Grayscale","BaseFilter","applyTo2d","_ref","imageData","data","value","i","length","r","g","b","this","Math","min","max","getCacheKey","concat","type","getFragmentSource","fragmentSource","sendUniformData","gl","uniformLocations","uniform1i","uMode","isNeutralState","_defineProperty","classRegistry","setClass"],"mappings":"0PAWO,MAAMA,EAA4C,CACvDC,KAAM,WAUD,MAAMC,UAAkBC,EAe7BC,SAAAA,CAASC,GAA4C,IAAzCC,WAAWC,KAAEA,IAA0BF,EACjD,IAAK,IAAWG,EAAPC,EAAI,EAAkBA,EAAIF,EAAKG,OAAQD,GAAK,EAAG,CACtD,MAAME,EAAIJ,EAAKE,GACTG,EAAIL,EAAKE,EAAI,GACbI,EAAIN,EAAKE,EAAI,GACnB,OAAQK,KAAKb,MACX,IAAK,UACHO,GAASG,EAAIC,EAAIC,GAAK,EACtB,MACF,IAAK,YACHL,GAASO,KAAKC,IAAIL,EAAGC,EAAGC,GAAKE,KAAKE,IAAIN,EAAGC,EAAGC,IAAM,EAClD,MACF,IAAK,aACHL,EAAQ,IAAOG,EAAI,IAAOC,EAAI,IAAOC,EAIzCN,EAAKE,EAAI,GAAKF,EAAKE,EAAI,GAAKF,EAAKE,GAAKD,CACxC,CACF,CAEAU,WAAAA,GACE,MAAAC,GAAAA,OAAUL,KAAKM,UAAID,OAAIL,KAAKb,KAC9B,CAEAoB,iBAAAA,GACE,OAAOC,EAAeR,KAAKb,KAC7B,CAQAsB,eAAAA,CACEC,EACAC,GAGAD,EAAGE,UAAUD,EAAiBE,MADjB,EAEf,CAOAC,cAAAA,GACE,OAAO,CACT,EACDC,EAlEY3B,EAAS,OAGN,aAAW2B,EAHd3B,EAAS,WAKFF,GAAsB6B,EAL7B3B,EAOe,mBAAA,CAAC,UA6D7B4B,EAAcC,SAAS7B"}