65 lines
2.4 KiB
JavaScript
65 lines
2.4 KiB
JavaScript
import { isNodePattern, throwError } from '@jimp/utils';
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/**
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* Scale the image to the given width and height keeping the aspect ratio. Some parts of the image may be letter boxed.
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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 (function () {
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return {
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contain: function contain(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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} // permit any sort of optional parameters combination
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if (typeof alignBits === 'string') {
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if (typeof mode === 'function' && typeof cb === 'undefined') cb = mode;
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mode = alignBits;
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alignBits = null;
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}
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if (typeof alignBits === 'function') {
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if (typeof cb === 'undefined') cb = alignBits;
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mode = null;
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alignBits = null;
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}
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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 = alignBits || this.constructor.HORIZONTAL_ALIGN_CENTER | this.constructor.VERTICAL_ALIGN_MIDDLE;
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var hbits = alignBits & (1 << 3) - 1;
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var vbits = alignBits >> 3; // check if more flags than one is in the bit sets
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if (!(hbits !== 0 && !(hbits & hbits - 1) || vbits !== 0 && !(vbits & vbits - 1))) {
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return throwError.call(this, 'only use one flag per alignment direction', cb);
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}
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var alignH = hbits >> 1; // 0, 1, 2
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var alignV = vbits >> 1; // 0, 1, 2
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var f = w / h > this.bitmap.width / this.bitmap.height ? h / this.bitmap.height : w / this.bitmap.width;
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var c = this.cloneQuiet().scale(f, mode);
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this.resize(w, h, mode);
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this.scanQuiet(0, 0, this.bitmap.width, this.bitmap.height, function (x, y, idx) {
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this.bitmap.data.writeUInt32BE(this._background, idx);
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});
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this.blit(c, (this.bitmap.width - c.bitmap.width) / 2 * alignH, (this.bitmap.height - c.bitmap.height) / 2 * alignV);
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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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});
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//# sourceMappingURL=index.js.map
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