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/* eslint-disable no-labels */
import { throwError, isNodePattern } from "@jimp/utils";
export default function pluginCrop(event) {
/**
* Crops the image at a given point to a give size
* @param {number} x the x coordinate to crop form
* @param {number} y the y coordinate to crop form
* @param w the width of the crop region
* @param h the height of the crop region
* @param {function(Error, Jimp)} cb (optional) a callback for when complete
* @returns {Jimp} this for chaining of methods
*/
event("crop", function (x, y, w, h, cb) {
if (typeof x !== "number" || typeof y !== "number")
return throwError.call(this, "x and y must be numbers", cb);
if (typeof w !== "number" || typeof h !== "number")
return throwError.call(this, "w and h must be numbers", cb);
// round input
x = Math.round(x);
y = Math.round(y);
w = Math.round(w);
h = Math.round(h);
if (x === 0 && w === this.bitmap.width) {
// shortcut
const start = (w * y + x) << 2;
const end = start + ((h * w) << 2);
this.bitmap.data = this.bitmap.data.slice(start, end);
} else {
const bitmap = Buffer.allocUnsafe(w * h * 4);
let offset = 0;
this.scanQuiet(x, y, w, h, function (x, y, idx) {
const data = this.bitmap.data.readUInt32BE(idx, true);
bitmap.writeUInt32BE(data, offset, true);
offset += 4;
});
this.bitmap.data = bitmap;
}
this.bitmap.width = w;
this.bitmap.height = h;
if (isNodePattern(cb)) {
cb.call(this, null, this);
}
return this;
});
return {
class: {
/**
* Autocrop same color borders from this image
* @param {number} tolerance (optional): a percent value of tolerance for pixels color difference (default: 0.0002%)
* @param {boolean} cropOnlyFrames (optional): flag to crop only real frames: all 4 sides of the image must have some border (default: true)
* @param {function(Error, Jimp)} cb (optional): a callback for when complete (default: no callback)
* @returns {Jimp} this for chaining of methods
*/
autocrop(...args) {
const w = this.bitmap.width;
const h = this.bitmap.height;
const minPixelsPerSide = 1; // to avoid cropping completely the image, resulting in an invalid 0 sized image
let cb; // callback
let leaveBorder = 0; // Amount of pixels in border to leave
let tolerance = 0.0002; // percent of color difference tolerance (default value)
let cropOnlyFrames = true; // flag to force cropping only if the image has a real "frame"
// i.e. all 4 sides have some border (default value)
let cropSymmetric = false; // flag to force cropping top be symmetric.
// i.e. north and south / east and west are cropped by the same value
let ignoreSides = {
north: false,
south: false,
east: false,
west: false,
};
// parse arguments
for (let a = 0, len = args.length; a < len; a++) {
if (typeof args[a] === "number") {
// tolerance value passed
tolerance = args[a];
}
if (typeof args[a] === "boolean") {
// cropOnlyFrames value passed
cropOnlyFrames = args[a];
}
if (typeof args[a] === "function") {
// callback value passed
cb = args[a];
}
if (typeof args[a] === "object") {
// config object passed
const config = args[a];
if (typeof config.tolerance !== "undefined") {
({ tolerance } = config);
}
if (typeof config.cropOnlyFrames !== "undefined") {
({ cropOnlyFrames } = config);
}
if (typeof config.cropSymmetric !== "undefined") {
({ cropSymmetric } = config);
}
if (typeof config.leaveBorder !== "undefined") {
({ leaveBorder } = config);
}
if (typeof config.ignoreSides !== "undefined") {
({ ignoreSides } = config);
}
}
}
/**
* All borders must be of the same color as the top left pixel, to be cropped.
* It should be possible to crop borders each with a different color,
* but since there are many ways for corners to intersect, it would
* introduce unnecessary complexity to the algorithm.
*/
// scan each side for same color borders
let colorTarget = this.getPixelColor(0, 0); // top left pixel color is the target color
const rgba1 = this.constructor.intToRGBA(colorTarget);
// for north and east sides
let northPixelsToCrop = 0;
let eastPixelsToCrop = 0;
let southPixelsToCrop = 0;
let westPixelsToCrop = 0;
// north side (scan rows from north to south)
colorTarget = this.getPixelColor(0, 0);
if (!ignoreSides.north) {
north: for (let y = 0; y < h - minPixelsPerSide; y++) {
for (let x = 0; x < w; x++) {
const colorXY = this.getPixelColor(x, y);
const rgba2 = this.constructor.intToRGBA(colorXY);
if (this.constructor.colorDiff(rgba1, rgba2) > tolerance) {
// this pixel is too distant from the first one: abort this side scan
break north;
}
}
// this row contains all pixels with the same color: increment this side pixels to crop
northPixelsToCrop++;
}
}
// west side (scan columns from west to east)
colorTarget = this.getPixelColor(w, 0);
if (!ignoreSides.west) {
west: for (let x = 0; x < w - minPixelsPerSide; x++) {
for (let y = 0 + northPixelsToCrop; y < h; y++) {
const colorXY = this.getPixelColor(x, y);
const rgba2 = this.constructor.intToRGBA(colorXY);
if (this.constructor.colorDiff(rgba1, rgba2) > tolerance) {
// this pixel is too distant from the first one: abort this side scan
break west;
}
}
// this column contains all pixels with the same color: increment this side pixels to crop
westPixelsToCrop++;
}
}
// south side (scan rows from south to north)
colorTarget = this.getPixelColor(0, h);
if (!ignoreSides.south) {
south: for (
let y = h - 1;
y >= northPixelsToCrop + minPixelsPerSide;
y--
) {
for (let x = w - eastPixelsToCrop - 1; x >= 0; x--) {
const colorXY = this.getPixelColor(x, y);
const rgba2 = this.constructor.intToRGBA(colorXY);
if (this.constructor.colorDiff(rgba1, rgba2) > tolerance) {
// this pixel is too distant from the first one: abort this side scan
break south;
}
}
// this row contains all pixels with the same color: increment this side pixels to crop
southPixelsToCrop++;
}
}
// east side (scan columns from east to west)
colorTarget = this.getPixelColor(w, h);
if (!ignoreSides.east) {
east: for (
let x = w - 1;
x >= 0 + westPixelsToCrop + minPixelsPerSide;
x--
) {
for (let y = h - 1; y >= 0 + northPixelsToCrop; y--) {
const colorXY = this.getPixelColor(x, y);
const rgba2 = this.constructor.intToRGBA(colorXY);
if (this.constructor.colorDiff(rgba1, rgba2) > tolerance) {
// this pixel is too distant from the first one: abort this side scan
break east;
}
}
// this column contains all pixels with the same color: increment this side pixels to crop
eastPixelsToCrop++;
}
}
// decide if a crop is needed
let doCrop = false;
// apply leaveBorder
westPixelsToCrop -= leaveBorder;
eastPixelsToCrop -= leaveBorder;
northPixelsToCrop -= leaveBorder;
southPixelsToCrop -= leaveBorder;
if (cropSymmetric) {
const horizontal = Math.min(eastPixelsToCrop, westPixelsToCrop);
const vertical = Math.min(northPixelsToCrop, southPixelsToCrop);
westPixelsToCrop = horizontal;
eastPixelsToCrop = horizontal;
northPixelsToCrop = vertical;
southPixelsToCrop = vertical;
}
// make sure that crops are >= 0
westPixelsToCrop = westPixelsToCrop >= 0 ? westPixelsToCrop : 0;
eastPixelsToCrop = eastPixelsToCrop >= 0 ? eastPixelsToCrop : 0;
northPixelsToCrop = northPixelsToCrop >= 0 ? northPixelsToCrop : 0;
southPixelsToCrop = southPixelsToCrop >= 0 ? southPixelsToCrop : 0;
// safety checks
const widthOfRemainingPixels =
w - (westPixelsToCrop + eastPixelsToCrop);
const heightOfRemainingPixels =
h - (southPixelsToCrop + northPixelsToCrop);
if (cropOnlyFrames) {
// crop image if all sides should be cropped
doCrop =
eastPixelsToCrop !== 0 &&
northPixelsToCrop !== 0 &&
westPixelsToCrop !== 0 &&
southPixelsToCrop !== 0;
} else {
// crop image if at least one side should be cropped
doCrop =
eastPixelsToCrop !== 0 ||
northPixelsToCrop !== 0 ||
westPixelsToCrop !== 0 ||
southPixelsToCrop !== 0;
}
if (doCrop) {
// do the real crop
this.crop(
westPixelsToCrop,
northPixelsToCrop,
widthOfRemainingPixels,
heightOfRemainingPixels
);
}
if (isNodePattern(cb)) {
cb.call(this, null, this);
}
return this;
},
},
};
}