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eslint-disable no-labels */\n\nimport { throwError, isNodePattern } from '@jimp/utils';\n\nexport default function pluginCrop(event) {\n /**\n * Crops the image at a given point to a give size\n * @param {number} x the x coordinate to crop form\n * @param {number} y the y coordinate to crop form\n * @param w the width of the crop region\n * @param h the height of the crop region\n * @param {function(Error, Jimp)} cb (optional) a callback for when complete\n * @returns {Jimp} this for chaining of methods\n */\n event('crop', function(x, y, w, h, cb) {\n if (typeof x !== 'number' || typeof y !== 'number')\n return throwError.call(this, 'x and y must be numbers', cb);\n if (typeof w !== 'number' || typeof h !== 'number')\n return throwError.call(this, 'w and h must be numbers', cb);\n\n // round input\n x = Math.round(x);\n y = Math.round(y);\n w = Math.round(w);\n h = Math.round(h);\n\n if (x === 0 && w === this.bitmap.width) {\n // shortcut\n const start = (w * y + x) << 2;\n const end 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*/\n autocrop(...args) {\n const w = this.bitmap.width;\n const h = this.bitmap.height;\n const minPixelsPerSide = 1; // to avoid cropping completely the image, resulting in an invalid 0 sized image\n\n let cb; // callback\n let leaveBorder = 0; // Amount of pixels in border to leave\n let tolerance = 0.0002; // percent of color difference tolerance (default value)\n let cropOnlyFrames = true; // flag to force cropping only if the image has a real \"frame\"\n // i.e. all 4 sides have some border (default value)\n let cropSymmetric = false; // flag to force cropping top be symmetric.\n // i.e. north and south / east and west are cropped by the same value\n\n // parse arguments\n for (let a = 0, len = args.length; a < len; a++) {\n if (typeof args[a] === 'number') {\n // tolerance value passed\n tolerance = args[a];\n }\n\n if (typeof args[a] === 'boolean') {\n // cropOnlyFrames value passed\n cropOnlyFrames = args[a];\n }\n\n if (typeof args[a] === 'function') {\n // callback value passed\n cb = args[a];\n }\n\n if (typeof args[a] === 'object') {\n // config object passed\n const config = args[a];\n\n if (typeof config.tolerance !== 'undefined') {\n ({ tolerance } = config);\n }\n\n if (typeof config.cropOnlyFrames !== 'undefined') {\n ({ cropOnlyFrames } = config);\n }\n\n if (typeof config.cropSymmetric !== 'undefined') {\n ({ cropSymmetric } = config);\n }\n\n if (typeof config.leaveBorder !== 'undefined') {\n ({ leaveBorder } = config);\n }\n }\n }\n\n /**\n * All borders must be of the same color as the top left pixel, to be cropped.\n * It should be possible to crop borders each with a different color,\n * but since there are many ways for corners to intersect, it would\n * introduce unnecessary complexity to the algorithm.\n */\n\n // scan each side for same color borders\n let colorTarget = this.getPixelColor(0, 0); // top left pixel color is the target color\n const rgba1 = this.constructor.intToRGBA(colorTarget);\n\n // for north and east sides\n let northPixelsToCrop = 0;\n let eastPixelsToCrop = 0;\n let southPixelsToCrop = 0;\n let westPixelsToCrop = 0;\n\n // north side (scan rows from north to south)\n colorTarget = this.getPixelColor(0, 0);\n north: for (let y = 0; y < h - minPixelsPerSide; y++) {\n for (let x = 0; x < w; x++) {\n const colorXY = this.getPixelColor(x, y);\n const rgba2 = this.constructor.intToRGBA(colorXY);\n\n if (this.constructor.colorDiff(rgba1, rgba2) > tolerance) {\n // this pixel is too distant from the first one: abort this side scan\n break north;\n }\n }\n\n // this row contains all pixels with the same color: increment this side pixels to crop\n northPixelsToCrop++;\n }\n\n // east side (scan columns from east to west)\n colorTarget = this.getPixelColor(w, 0);\n east: for (let x = 0; x < w - minPixelsPerSide; x++) {\n for (let y = 0 + northPixelsToCrop; y < h; y++) {\n const colorXY = this.getPixelColor(x, y);\n const rgba2 = this.constructor.intToRGBA(colorXY);\n\n if 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w - 1;\n x >= 0 + eastPixelsToCrop + minPixelsPerSide;\n x--\n ) {\n for (let y = h - 1; y >= 0 + northPixelsToCrop; y--) {\n const colorXY = this.getPixelColor(x, y);\n const rgba2 = this.constructor.intToRGBA(colorXY);\n\n if (this.constructor.colorDiff(rgba1, rgba2) > tolerance) {\n // this pixel is too distant from the first one: abort this side scan\n break west;\n }\n }\n\n // this column contains all pixels with the same color: increment this side pixels to crop\n westPixelsToCrop++;\n }\n\n // decide if a crop is needed\n let doCrop = false;\n\n // apply leaveBorder\n westPixelsToCrop -= leaveBorder;\n eastPixelsToCrop -= leaveBorder;\n northPixelsToCrop -= leaveBorder;\n southPixelsToCrop -= leaveBorder;\n\n if (cropSymmetric) {\n const horizontal = Math.min(eastPixelsToCrop, westPixelsToCrop);\n const vertical = Math.min(northPixelsToCrop, southPixelsToCrop);\n westPixelsToCrop = horizontal;\n eastPixelsToCrop = horizontal;\n northPixelsToCrop = vertical;\n southPixelsToCrop = vertical;\n }\n\n // make sure that crops are >= 0\n westPixelsToCrop = westPixelsToCrop >= 0 ? westPixelsToCrop : 0;\n eastPixelsToCrop = eastPixelsToCrop >= 0 ? eastPixelsToCrop : 0;\n northPixelsToCrop = northPixelsToCrop >= 0 ? northPixelsToCrop : 0;\n southPixelsToCrop = southPixelsToCrop >= 0 ? southPixelsToCrop : 0;\n\n // safety checks\n const widthOfRemainingPixels =\n w - (westPixelsToCrop + eastPixelsToCrop);\n const heightOfRemainingPixels =\n h - (southPixelsToCrop + northPixelsToCrop);\n\n if (cropOnlyFrames) {\n // crop image if all sides should be cropped\n doCrop =\n eastPixelsToCrop !== 0 &&\n northPixelsToCrop !== 0 &&\n westPixelsToCrop !== 0 &&\n southPixelsToCrop !== 0;\n } else {\n // crop image if at least one side should be cropped\n doCrop =\n eastPixelsToCrop !== 0 ||\n northPixelsToCrop !== 0 ||\n westPixelsToCrop !== 0 ||\n southPixelsToCrop !== 0;\n }\n\n if (doCrop) {\n // do the real crop\n this.crop(\n eastPixelsToCrop,\n northPixelsToCrop,\n 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