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      switch (this.mode) {\n        case 'average':\n          value = (data[i] + data[i + 1] + data[i + 2]) / 3;\n          break;\n        case 'lightness':\n          value =\n            (Math.min(data[i], data[i + 1], data[i + 2]) +\n              Math.max(data[i], data[i + 1], data[i + 2])) /\n            2;\n          break;\n        case 'luminosity':\n          value = 0.21 * data[i] + 0.72 * data[i + 1] + 0.07 * data[i + 2];\n          break;\n      }\n\n      data[i] = value;\n      data[i + 1] = value;\n      data[i + 2] = 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","Math","min","max","getCacheKey","concat","type","getFragmentSource","fragmentSource","sendUniformData","gl","uniformLocations","uniform1i","uMode","isNeutralState","_defineProperty","classRegistry","setClass"],"mappings":";;;;;AAWO,MAAMA,sBAAyC,GAAG;AACvDC,EAAAA,IAAI,EAAE,SAAA;AACR,EAAC;;AAED;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,IAAAA;AAAK,OAAA;AAAoB,KAAC,GAAAF,IAAA,CAAA;AACjD,IAAA,KAAK,IAAIG,CAAC,GAAG,CAAC,EAAEC,KAAa,EAAED,CAAC,GAAGD,IAAI,CAACG,MAAM,EAAEF,CAAC,IAAI,CAAC,EAAE;MACtD,QAAQ,IAAI,CAACP,IAAI;AACf,QAAA,KAAK,SAAS;UACZQ,KAAK,GAAG,CAACF,IAAI,CAACC,CAAC,CAAC,GAAGD,IAAI,CAACC,CAAC,GAAG,CAAC,CAAC,GAAGD,IAAI,CAACC,CAAC,GAAG,CAAC,CAAC,IAAI,CAAC,CAAA;AACjD,UAAA,MAAA;AACF,QAAA,KAAK,WAAW;UACdC,KAAK,GACH,CAACE,IAAI,CAACC,GAAG,CAACL,IAAI,CAACC,CAAC,CAAC,EAAED,IAAI,CAACC,CAAC,GAAG,CAAC,CAAC,EAAED,IAAI,CAACC,CAAC,GAAG,CAAC,CAAC,CAAC,GAC1CG,IAAI,CAACE,GAAG,CAACN,IAAI,CAACC,CAAC,CAAC,EAAED,IAAI,CAACC,CAAC,GAAG,CAAC,CAAC,EAAED,IAAI,CAACC,CAAC,GAAG,CAAC,CAAC,CAAC,IAC7C,CAAC,CAAA;AACH,UAAA,MAAA;AACF,QAAA,KAAK,YAAY;UACfC,KAAK,GAAG,IAAI,GAAGF,IAAI,CAACC,CAAC,CAAC,GAAG,IAAI,GAAGD,IAAI,CAACC,CAAC,GAAG,CAAC,CAAC,GAAG,IAAI,GAAGD,IAAI,CAACC,CAAC,GAAG,CAAC,CAAC,CAAA;AAChE,UAAA,MAAA;AACJ,OAAA;AAEAD,MAAAA,IAAI,CAACC,CAAC,CAAC,GAAGC,KAAK,CAAA;AACfF,MAAAA,IAAI,CAACC,CAAC,GAAG,CAAC,CAAC,GAAGC,KAAK,CAAA;AACnBF,MAAAA,IAAI,CAACC,CAAC,GAAG,CAAC,CAAC,GAAGC,KAAK,CAAA;AACrB,KAAA;AACF,GAAA;AAEAK,EAAAA,WAAWA,GAAG;IACZ,OAAAC,EAAAA,CAAAA,MAAA,CAAU,IAAI,CAACC,IAAI,OAAAD,MAAA,CAAI,IAAI,CAACd,IAAI,CAAA,CAAA;AAClC,GAAA;AAEAgB,EAAAA,iBAAiBA,GAAG;AAClB,IAAA,OAAOC,cAAc,CAAC,IAAI,CAACjB,IAAI,CAAC,CAAA;AAClC,GAAA;;AAEA;AACF;AACA;AACA;AACA;AACA;AACEkB,EAAAA,eAAeA,CACbC,EAAyB,EACzBC,gBAA0C,EAC1C;IACA,MAAMpB,IAAI,GAAG,CAAC,CAAA;IACdmB,EAAE,CAACE,SAAS,CAACD,gBAAgB,CAACE,KAAK,EAAEtB,IAAI,CAAC,CAAA;AAC5C,GAAA;;AAEA;AACF;AACA;AACA;AACA;AACEuB,EAAAA,cAAcA,GAAG;AACf,IAAA,OAAO,KAAK,CAAA;AACd,GAAA;AACF,CAAA;AAACC,eAAA,CApEYvB,SAAS,EAAA,MAAA,EAGN,WAAW,CAAA,CAAA;AAAAuB,eAAA,CAHdvB,SAAS,EAAA,UAAA,EAKFF,sBAAsB,CAAA,CAAA;AAAAyB,eAAA,CAL7BvB,SAAS,EAOM,kBAAA,EAAA,CAAC,OAAO,CAAC,CAAA,CAAA;AA+DrCwB,aAAa,CAACC,QAAQ,CAACzB,SAAS,CAAC;;;;"}