57 lines
2.3 KiB
JavaScript
57 lines
2.3 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 (() => ({
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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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}
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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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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))) {
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return throwError.call(this, "only use one flag per alignment direction", 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 = w / h > this.bitmap.width / this.bitmap.height ? h / this.bitmap.height : w / this.bitmap.width;
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const 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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//# sourceMappingURL=index.js.map
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