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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 };
}
}
}
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