import { isNodePattern, throwError } from '@jimp/utils';
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/**
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* Scale the image so the given width and height keeping the aspect ratio. Some parts of the image may be clipped.
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* @param {number} w the width to resize the image to
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* @param {number} h the height to resize the image to
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* @param {number} alignBits (optional) A bitmask for horizontal and vertical alignment
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* @param {string} mode (optional) a scaling method (e.g. Jimp.RESIZE_BEZIER)
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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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export default () => ({
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cover(w, h, alignBits, mode, cb) {
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if (typeof w !== 'number' || typeof h !== 'number') {
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return throwError.call(this, 'w and h must be numbers', cb);
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}
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if (
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alignBits &&
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typeof alignBits === 'function' &&
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typeof cb === 'undefined'
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) {
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cb = alignBits;
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alignBits = null;
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mode = null;
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} else if (typeof mode === 'function' && typeof cb === 'undefined') {
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cb = mode;
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mode = null;
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}
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alignBits =
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alignBits ||
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this.constructor.HORIZONTAL_ALIGN_CENTER |
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this.constructor.VERTICAL_ALIGN_MIDDLE;
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const hbits = alignBits & ((1 << 3) - 1);
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const vbits = alignBits >> 3;
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// check if more flags than one is in the bit sets
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if (
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!(
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(hbits !== 0 && !(hbits & (hbits - 1))) ||
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(vbits !== 0 && !(vbits & (vbits - 1)))
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)
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)
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return throwError.call(
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this,
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'only use one flag per alignment direction',
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cb
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);
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const alignH = hbits >> 1; // 0, 1, 2
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const alignV = vbits >> 1; // 0, 1, 2
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const f =
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w / h > this.bitmap.width / this.bitmap.height
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? w / this.bitmap.width
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: h / this.bitmap.height;
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this.scale(f, mode);
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this.crop(
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((this.bitmap.width - w) / 2) * alignH,
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((this.bitmap.height - h) / 2) * alignV,
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w,
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h
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);
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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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});
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