imagerot
Version:
A lightweight, cross-environment image library for applying unique effects via raw image buffers.
50 lines (49 loc) • 2.18 kB
JavaScript
;
var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, generator) {
function adopt(value) { return value instanceof P ? value : new P(function (resolve) { resolve(value); }); }
return new (P || (P = Promise))(function (resolve, reject) {
function fulfilled(value) { try { step(generator.next(value)); } catch (e) { reject(e); } }
function rejected(value) { try { step(generator["throw"](value)); } catch (e) { reject(e); } }
function step(result) { result.done ? resolve(result.value) : adopt(result.value).then(fulfilled, rejected); }
step((generator = generator.apply(thisArg, _arguments || [])).next());
});
};
Object.defineProperty(exports, "__esModule", { value: true });
exports.sharpen = void 0;
const global = (_a) => __awaiter(void 0, [_a], void 0, function* ({ data, width, height }) {
const kernel = [
0, -1, 0,
-1, 5, -1,
0, -1, 0
];
const target = new Uint8Array(data.length);
for (let y = 0; y < height; y++) {
for (let x = 0; x < width; x++) {
const idx = (y * width + x) * 4;
let r = 0, g = 0, b = 0;
for (let ky = -1; ky <= 1; ky++) {
for (let kx = -1; kx <= 1; kx++) {
const xSample = Math.max(0, Math.min(width - 1, x + kx));
const ySample = Math.max(0, Math.min(height - 1, y + ky));
const sampleIdx = (ySample * width + xSample) * 4;
const kernelIdx = (ky + 1) * 3 + (kx + 1);
r += data[sampleIdx + 0] * kernel[kernelIdx];
g += data[sampleIdx + 1] * kernel[kernelIdx];
b += data[sampleIdx + 2] * kernel[kernelIdx];
}
}
target[idx + 0] = Math.min(255, Math.max(0, r));
target[idx + 1] = Math.min(255, Math.max(0, g));
target[idx + 2] = Math.min(255, Math.max(0, b));
target[idx + 3] = data[idx + 3];
}
}
data.set(target);
return data;
});
const sharpen = {
name: 'sharpen',
browser: global,
node: global
};
exports.sharpen = sharpen;