imagerot
Version:
A lightweight, cross-environment image library for applying unique effects via raw image buffers.
64 lines (63 loc) • 3.63 kB
JavaScript
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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.rectangles = void 0;
const math_1 = require("../../../constants/math");
const defaultOffset = 5;
const defaultIntensity = 10;
const defaultSizeModifier = 1;
const defaultInvertChance = 0.15;
const minDimensionFraction = 0.25;
const minRectangularity = 1.5;
const global = (_a, ...args_1) => __awaiter(void 0, [_a, ...args_1], void 0, function* ({ data, width, height }, options = null) {
const { offset = defaultOffset, intensity = defaultIntensity, sizeModifier = defaultSizeModifier, invertChance = defaultInvertChance } = (options || {});
const newData = new Uint8Array(data);
const numRects = intensity;
const baseRectDim = (0, math_1.floor)((0, math_1.max)(20, (0, math_1.min)(width, height) / 10) * sizeModifier);
for (let i = 0; i < numRects; i++) {
let rectWidth, rectHeight;
do {
rectWidth = (0, math_1.floor)(minDimensionFraction * baseRectDim + (0, math_1.random)() * (1 - minDimensionFraction) * baseRectDim);
rectHeight = (0, math_1.floor)(minDimensionFraction * baseRectDim + (0, math_1.random)() * (1 - minDimensionFraction) * baseRectDim);
} while ((0, math_1.max)(rectWidth, rectHeight) / (0, math_1.min)(rectWidth, rectHeight) < minRectangularity);
const rectX = (0, math_1.floor)((0, math_1.random)() * (width - rectWidth));
const rectY = (0, math_1.floor)((0, math_1.random)() * (height - rectHeight));
const displacementX = (0, math_1.floor)(((0, math_1.random)() - 0.5) * 2 * offset);
const displacementY = (0, math_1.floor)(((0, math_1.random)() - 0.5) * 2 * offset);
const brightness = 5 + (0, math_1.floor)((0, math_1.random)() * 15) * ((0, math_1.random)() > 0.5 ? 1 : -1);
const invertColors = (0, math_1.random)() < invertChance;
for (let y = rectY; y < rectY + rectHeight; y++) {
for (let x = rectX; x < rectX + rectWidth; x++) {
const origIndex = (y * width + x) * 4;
const displacedIndex = (((y + displacementY + height) % height) * width + ((x + displacementX + width) % width)) * 4;
for (let j = 0; j < 3; j++) {
let adjustedPixel = data[displacedIndex + j] + brightness;
if (invertColors) {
adjustedPixel = 255 - adjustedPixel;
}
adjustedPixel = (0, math_1.max)(0, (0, math_1.min)(255, adjustedPixel));
if (invertColors && adjustedPixel < 50) {
continue;
}
newData[origIndex + j] = adjustedPixel;
}
newData[origIndex + 3] = data[displacedIndex + 3];
}
}
}
return newData;
});
const rectangles = {
name: 'rectangles',
browser: global,
node: global
};
exports.rectangles = rectangles;