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import { isNodePattern, throwError } from "@jimp/utils";
/**
* Scale the image to the given width and height keeping the aspect ratio. Some parts of the image may be letter boxed.
* @param {number} w the width to resize the image to
* @param {number} h the height to resize the image to
* @param {number} alignBits (optional) A bitmask for horizontal and vertical alignment
* @param {string} mode (optional) a scaling method (e.g. Jimp.RESIZE_BEZIER)
* @param {function(Error, Jimp)} cb (optional) a callback for when complete
* @returns {Jimp} this for chaining of methods
*/
export default () => ({
contain(w, h, alignBits, mode, cb) {
if (typeof w !== "number" || typeof h !== "number") {
return throwError.call(this, "w and h must be numbers", cb);
}
// permit any sort of optional parameters combination
if (typeof alignBits === "string") {
if (typeof mode === "function" && typeof cb === "undefined") cb = mode;
mode = alignBits;
alignBits = null;
}
if (typeof alignBits === "function") {
if (typeof cb === "undefined") cb = alignBits;
mode = null;
alignBits = null;
}
if (typeof mode === "function" && typeof cb === "undefined") {
cb = mode;
mode = null;
}
alignBits =
alignBits ||
this.constructor.HORIZONTAL_ALIGN_CENTER |
this.constructor.VERTICAL_ALIGN_MIDDLE;
const hbits = alignBits & ((1 << 3) - 1);
const vbits = alignBits >> 3;
// check if more flags than one is in the bit sets
if (
!(
(hbits !== 0 && !(hbits & (hbits - 1))) ||
(vbits !== 0 && !(vbits & (vbits - 1)))
)
) {
return throwError.call(
this,
"only use one flag per alignment direction",
cb
);
}
const alignH = hbits >> 1; // 0, 1, 2
const alignV = vbits >> 1; // 0, 1, 2
const f =
w / h > this.bitmap.width / this.bitmap.height
? h / this.bitmap.height
: w / this.bitmap.width;
const c = this.cloneQuiet().scale(f, mode);
this.resize(w, h, mode);
this.scanQuiet(
0,
0,
this.bitmap.width,
this.bitmap.height,
function (x, y, idx) {
this.bitmap.data.writeUInt32BE(this._background, idx);
}
);
this.blit(
c,
((this.bitmap.width - c.bitmap.width) / 2) * alignH,
((this.bitmap.height - c.bitmap.height) / 2) * alignV
);
if (isNodePattern(cb)) {
cb.call(this, null, this);
}
return this;
},
});