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@jimp
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utils
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index.js
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export function isNodePattern(cb) { if (typeof cb === "undefined") { return false; } if (typeof cb !== "function") { throw new TypeError("Callback must be a function"); } return true; } export function throwError(error, cb) { if (typeof error === "string") { error = new Error(error); } if (typeof cb === "function") { return cb.call(this, error); } throw error; } export function scan(image, x, y, w, h, f) { // round input x = Math.round(x); y = Math.round(y); w = Math.round(w); h = Math.round(h); for (let _y = y; _y < y + h; _y++) { for (let _x = x; _x < x + w; _x++) { const idx = (image.bitmap.width * _y + _x) << 2; f.call(image, _x, _y, idx); } } return image; } export function* scanIterator(image, x, y, w, h) { // round input x = Math.round(x); y = Math.round(y); w = Math.round(w); h = Math.round(h); for (let _y = y; _y < y + h; _y++) { for (let _x = x; _x < x + w; _x++) { const idx = (image.bitmap.width * _y + _x) << 2; yield { x: _x, y: _y, idx, image }; } } }