50 lines
1.3 KiB
JavaScript
50 lines
1.3 KiB
JavaScript
import { isNodePattern, throwError } from '@jimp/utils';
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/**
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* Flip the image horizontally
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* @param {boolean} horizontal a Boolean, if true the image will be flipped horizontally
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* @param {boolean} vertical a Boolean, if true the image will be flipped vertically
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* @param {function(Error, Jimp)} cb (optional) a callback for when complete
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* @returns {Jimp} this for chaining of methods
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*/
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function flipFn(horizontal, vertical, cb) {
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if (typeof horizontal !== 'boolean' || typeof vertical !== 'boolean')
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return throwError.call(
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this,
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'horizontal and vertical must be Booleans',
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cb
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);
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if (horizontal && vertical) {
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// shortcut
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return this.rotate(180, true, cb);
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}
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const bitmap = Buffer.alloc(this.bitmap.data.length);
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this.scanQuiet(0, 0, this.bitmap.width, this.bitmap.height, function(
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x,
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y,
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idx
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) {
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const _x = horizontal ? this.bitmap.width - 1 - x : x;
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const _y = vertical ? this.bitmap.height - 1 - y : y;
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const _idx = (this.bitmap.width * _y + _x) << 2;
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const data = this.bitmap.data.readUInt32BE(idx);
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bitmap.writeUInt32BE(data, _idx);
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});
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this.bitmap.data = Buffer.from(bitmap);
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if (isNodePattern(cb)) {
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cb.call(this, null, this);
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}
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return this;
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}
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export default () => ({
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flip: flipFn,
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mirror: flipFn
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});
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