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

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

{"version":3,"file":"Contrast.mjs","sources":["../../../src/filters/Contrast.ts"],"sourcesContent":["import { BaseFilter } from './BaseFilter';\nimport type { T2DPipelineState, TWebGLUniformLocationMap } from './typedefs';\nimport { classRegistry } from '../ClassRegistry';\nimport { fragmentSource } from './shaders/constrast';\n\ntype ContrastOwnProps = {\n  contrast: number;\n};\n\nexport const contrastDefaultValues: ContrastOwnProps = {\n  contrast: 0,\n};\n\n/**\n * Contrast filter class\n * @example\n * const filter = new Contrast({\n *   contrast: 0.25\n * });\n * object.filters.push(filter);\n * object.applyFilters();\n */\nexport class Contrast extends BaseFilter<'Contrast', ContrastOwnProps> {\n  /**\n   * contrast value, range from -1 to 1.\n   * @param {Number} contrast\n   * @default 0\n   */\n  declare contrast: ContrastOwnProps['contrast'];\n\n  static type = 'Contrast';\n\n  static defaults = contrastDefaultValues;\n\n  static uniformLocations = ['uContrast'];\n\n  getFragmentSource() {\n    return fragmentSource;\n  }\n\n  isNeutralState() {\n    return this.contrast === 0;\n  }\n\n  /**\n   * Apply the Contrast 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 contrast = Math.floor(this.contrast * 255),\n      contrastF = (259 * (contrast + 255)) / (255 * (259 - contrast));\n\n    for (let i = 0; i < data.length; i += 4) {\n      data[i] = contrastF * (data[i] - 128) + 128;\n      data[i + 1] = contrastF * (data[i + 1] - 128) + 128;\n      data[i + 2] = contrastF * (data[i + 2] - 128) + 128;\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.uniform1f(uniformLocations.uContrast, this.contrast);\n  }\n}\n\nclassRegistry.setClass(Contrast);\n"],"names":["contrastDefaultValues","contrast","Contrast","BaseFilter","getFragmentSource","fragmentSource","isNeutralState","applyTo2d","_ref","imageData","data","Math","floor","contrastF","i","length","sendUniformData","gl","uniformLocations","uniform1f","uContrast","_defineProperty","classRegistry","setClass"],"mappings":";;;;;AASO,MAAMA,qBAAuC,GAAG;AACrDC,EAAAA,QAAQ,EAAE,CAAA;AACZ,EAAC;;AAED;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACA;AACO,MAAMC,QAAQ,SAASC,UAAU,CAA+B;AAcrEC,EAAAA,iBAAiBA,GAAG;AAClB,IAAA,OAAOC,cAAc,CAAA;AACvB,GAAA;AAEAC,EAAAA,cAAcA,GAAG;AACf,IAAA,OAAO,IAAI,CAACL,QAAQ,KAAK,CAAC,CAAA;AAC5B,GAAA;;AAEA;AACF;AACA;AACA;AACA;AACA;EACEM,SAASA,CAAAC,IAAA,EAA4C;IAAA,IAA3C;AAAEC,MAAAA,SAAS,EAAE;AAAEC,QAAAA,IAAAA;AAAK,OAAA;AAAoB,KAAC,GAAAF,IAAA,CAAA;IACjD,MAAMP,QAAQ,GAAGU,IAAI,CAACC,KAAK,CAAC,IAAI,CAACX,QAAQ,GAAG,GAAG,CAAC;AAC9CY,MAAAA,SAAS,GAAI,GAAG,IAAIZ,QAAQ,GAAG,GAAG,CAAC,IAAK,GAAG,IAAI,GAAG,GAAGA,QAAQ,CAAC,CAAC,CAAA;AAEjE,IAAA,KAAK,IAAIa,CAAC,GAAG,CAAC,EAAEA,CAAC,GAAGJ,IAAI,CAACK,MAAM,EAAED,CAAC,IAAI,CAAC,EAAE;AACvCJ,MAAAA,IAAI,CAACI,CAAC,CAAC,GAAGD,SAAS,IAAIH,IAAI,CAACI,CAAC,CAAC,GAAG,GAAG,CAAC,GAAG,GAAG,CAAA;AAC3CJ,MAAAA,IAAI,CAACI,CAAC,GAAG,CAAC,CAAC,GAAGD,SAAS,IAAIH,IAAI,CAACI,CAAC,GAAG,CAAC,CAAC,GAAG,GAAG,CAAC,GAAG,GAAG,CAAA;AACnDJ,MAAAA,IAAI,CAACI,CAAC,GAAG,CAAC,CAAC,GAAGD,SAAS,IAAIH,IAAI,CAACI,CAAC,GAAG,CAAC,CAAC,GAAG,GAAG,CAAC,GAAG,GAAG,CAAA;AACrD,KAAA;AACF,GAAA;;AAEA;AACF;AACA;AACA;AACA;AACA;AACEE,EAAAA,eAAeA,CACbC,EAAyB,EACzBC,gBAA0C,EAC1C;IACAD,EAAE,CAACE,SAAS,CAACD,gBAAgB,CAACE,SAAS,EAAE,IAAI,CAACnB,QAAQ,CAAC,CAAA;AACzD,GAAA;AACF,CAAA;AAlDE;AACF;AACA;AACA;AACA;AAJEoB,eAAA,CADWnB,QAAQ,EAAA,MAAA,EAQL,UAAU,CAAA,CAAA;AAAAmB,eAAA,CARbnB,QAAQ,EAAA,UAAA,EAUDF,qBAAqB,CAAA,CAAA;AAAAqB,eAAA,CAV5BnB,QAAQ,EAYO,kBAAA,EAAA,CAAC,WAAW,CAAC,CAAA,CAAA;AAyCzCoB,aAAa,CAACC,QAAQ,CAACrB,QAAQ,CAAC;;;;"}