imagerot
Version:
A lightweight, cross-environment image library for applying unique effects via raw image buffers.
37 lines (36 loc) • 1.75 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.degrade = void 0;
const canvas_1 = require("canvas");
const defaultQuality = 0.075;
const node = (_a, ...args_1) => __awaiter(void 0, [_a, ...args_1], void 0, function* ({ data, width, height }, options = null) {
const { quality = defaultQuality } = (options || {});
const canvas = (0, canvas_1.createCanvas)(width, height);
const context = canvas.getContext('2d');
const imageData = context.createImageData(width, height);
imageData.data.set(data);
context.putImageData(imageData, 0, 0);
const degradedImage = canvas.toBuffer('image/jpeg', {
quality
});
const img = new canvas_1.Image();
img.src = degradedImage;
context.clearRect(0, 0, canvas.width, canvas.height);
context.drawImage(img, 0, 0, img.width, img.height);
const degradedImageData = context.getImageData(0, 0, width, height);
return new Uint8Array(degradedImageData.data);
});
const degrade = {
name: 'degrade',
node: node
};
exports.degrade = degrade;