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

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

{"version":3,"file":"Grayscale.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","i","value","length","r","g","b","Math","min","max","getCacheKey","type","getFragmentSource","fragmentSource","sendUniformData","gl","uniformLocations","uniform1i","uMode","isNeutralState","_defineProperty","classRegistry","setClass"],"mappings":";;;;;AAWO,MAAMA,sBAAyC,GAAG;AACvDC,EAAAA,IAAI,EAAE;AACR;;AAEA;AACA;AACA;AACA;AACA;AACA;AACA;AACO,MAAMC,SAAS,SAASC,UAAU,CAAiC;AASxE;AACF;AACA;AACA;AACA;AACA;EACEC,SAASA,CAAAC,IAAA,EAA4C;IAAA,IAA3C;AAAEC,MAAAA,SAAS,EAAE;AAAEC,QAAAA;AAAK;AAAoB,KAAC,GAAAF,IAAA;AACjD,IAAA,KAAK,IAAIG,CAAC,GAAG,CAAC,EAAEC,KAAa,EAAED,CAAC,GAAGD,IAAI,CAACG,MAAM,EAAEF,CAAC,IAAI,CAAC,EAAE;AACtD,MAAA,MAAMG,CAAC,GAAGJ,IAAI,CAACC,CAAC,CAAC;AACjB,MAAA,MAAMI,CAAC,GAAGL,IAAI,CAACC,CAAC,GAAG,CAAC,CAAC;AACrB,MAAA,MAAMK,CAAC,GAAGN,IAAI,CAACC,CAAC,GAAG,CAAC,CAAC;MACrB,QAAQ,IAAI,CAACP,IAAI;AACf,QAAA,KAAK,SAAS;UACZQ,KAAK,GAAG,CAACE,CAAC,GAAGC,CAAC,GAAGC,CAAC,IAAI,CAAC;AACvB,UAAA;AACF,QAAA,KAAK,WAAW;UACdJ,KAAK,GAAG,CAACK,IAAI,CAACC,GAAG,CAACJ,CAAC,EAAEC,CAAC,EAAEC,CAAC,CAAC,GAAGC,IAAI,CAACE,GAAG,CAACL,CAAC,EAAEC,CAAC,EAAEC,CAAC,CAAC,IAAI,CAAC;AACnD,UAAA;AACF,QAAA,KAAK,YAAY;UACfJ,KAAK,GAAG,IAAI,GAAGE,CAAC,GAAG,IAAI,GAAGC,CAAC,GAAG,IAAI,GAAGC,CAAC;AACtC,UAAA;AACJ;AAEAN,MAAAA,IAAI,CAACC,CAAC,GAAG,CAAC,CAAC,GAAGD,IAAI,CAACC,CAAC,GAAG,CAAC,CAAC,GAAGD,IAAI,CAACC,CAAC,CAAC,GAAGC,KAAK;AAC7C,IAAA;AACF,EAAA;AAEAQ,EAAAA,WAAWA,GAAG;IACZ,OAAO,CAAA,EAAG,IAAI,CAACC,IAAI,IAAI,IAAI,CAACjB,IAAI,CAAA,CAAE;AACpC,EAAA;AAEAkB,EAAAA,iBAAiBA,GAAG;AAClB,IAAA,OAAOC,cAAc,CAAC,IAAI,CAACnB,IAAI,CAAC;AAClC,EAAA;;AAEA;AACF;AACA;AACA;AACA;AACA;AACEoB,EAAAA,eAAeA,CACbC,EAAyB,EACzBC,gBAA0C,EAC1C;IACA,MAAMtB,IAAI,GAAG,CAAC;IACdqB,EAAE,CAACE,SAAS,CAACD,gBAAgB,CAACE,KAAK,EAAExB,IAAI,CAAC;AAC5C,EAAA;;AAEA;AACF;AACA;AACA;AACA;AACEyB,EAAAA,cAAcA,GAAG;AACf,IAAA,OAAO,KAAK;AACd,EAAA;AACF;AAACC,eAAA,CAlEYzB,SAAS,EAAA,MAAA,EAGN,WAAW,CAAA;AAAAyB,eAAA,CAHdzB,SAAS,EAAA,UAAA,EAKFF,sBAAsB,CAAA;AAAA2B,eAAA,CAL7BzB,SAAS,EAAA,kBAAA,EAOM,CAAC,OAAO,CAAC,CAAA;AA6DrC0B,aAAa,CAACC,QAAQ,CAAC3B,SAAS,CAAC;;;;"}