imagerot
Version:
A lightweight, cross-environment image library for applying unique effects via raw image buffers.
62 lines (61 loc) • 3.81 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.mirrorfold = void 0;
const mirrorfold = (_a, ...args_1) => __awaiter(void 0, [_a, ...args_1], void 0, function* ({ data, width, height }, options = {}) {
var _b, _c, _d;
if (data.length === 0)
return data;
const folds = (_b = options.folds) !== null && _b !== void 0 ? _b : 4;
const blendOpacity = (_c = options.blendOpacity) !== null && _c !== void 0 ? _c : 0.5;
const randomOffset = (_d = options.randomOffset) !== null && _d !== void 0 ? _d : true;
const tempData = new Uint8Array(data); // Copy for mirroring without overwrite
// Calculate fold sizes (assume even division for simplicity; adjust for odd dims)
const foldWidth = Math.floor(width / Math.sqrt(folds));
const foldHeight = Math.floor(height / Math.sqrt(folds));
const gridSize = Math.sqrt(folds); // e.g., 2 for 4 folds (2x2 grid)
for (let gy = 0; gy < gridSize; gy++) {
for (let gx = 0; gx < gridSize; gx++) {
const baseX = gx * foldWidth;
const baseY = gy * foldHeight;
// Apply random offset if enabled (small glitch shift, e.g., -5 to 5 px)
const offsetX = randomOffset ? Math.floor(Math.random() * 10 - 5) : 0;
const offsetY = randomOffset ? Math.floor(Math.random() * 10 - 5) : 0;
// Mirror the section from the top-left fold (source) to this position
for (let y = 0; y < foldHeight; y++) {
for (let x = 0; x < foldWidth; x++) {
// Source: mirror/flip based on grid position (e.g., flip X for right folds, Y for bottom)
const srcX = (gx % 2 === 1 ? foldWidth - 1 - x : x) + offsetX;
const srcY = (gy % 2 === 1 ? foldHeight - 1 - y : y) + offsetY;
// Clamp source coords to valid range
const clampedSrcX = Math.max(0, Math.min(foldWidth - 1, srcX));
const clampedSrcY = Math.max(0, Math.min(foldHeight - 1, srcY));
const srcIdx = (clampedSrcY * width + clampedSrcX) * 4;
const destIdx = ((baseY + y) * width + (baseX + x)) * 4;
// Blend with original if near edges or for opacity
const originalR = data[destIdx];
const originalG = data[destIdx + 1];
const originalB = data[destIdx + 2];
const mirroredR = tempData[srcIdx];
const mirroredG = tempData[srcIdx + 1];
const mirroredB = tempData[srcIdx + 2];
// Simple alpha blend
data[destIdx] = Math.floor(mirroredR * blendOpacity + originalR * (1 - blendOpacity));
data[destIdx + 1] = Math.floor(mirroredG * blendOpacity + originalG * (1 - blendOpacity));
data[destIdx + 2] = Math.floor(mirroredB * blendOpacity + originalB * (1 - blendOpacity));
// Alpha unchanged
}
}
}
}
return data;
});
exports.mirrorfold = mirrorfold;