43 lines
1.9 KiB
JavaScript
43 lines
1.9 KiB
JavaScript
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 (alignBits && typeof alignBits === "function" && typeof cb === "undefined") {
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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 = alignBits || this.constructor.HORIZONTAL_ALIGN_CENTER | 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 (!(hbits !== 0 && !(hbits & hbits - 1) || vbits !== 0 && !(vbits & vbits - 1))) return throwError.call(this, "only use one flag per alignment direction", cb);
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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 = w / h > this.bitmap.width / this.bitmap.height ? w / this.bitmap.width : h / this.bitmap.height;
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this.scale(f, mode);
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this.crop((this.bitmap.width - w) / 2 * alignH, (this.bitmap.height - h) / 2 * alignV, w, h);
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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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//# sourceMappingURL=index.js.map
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