Ewald
ae8adfbe43
- Add Ctrl+mousewheel zooming to draw node preview - Implement grab+drag panning for draw node preview - Double-click to reset zoom/pan - Adjust brush cursor size for zoom level - Refactor preview rendering and interaction handling
54 lines
1.6 KiB
JavaScript
54 lines
1.6 KiB
JavaScript
const DEFAULTS = {
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version: 1,
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epsilon: 1e-6,
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luma_weights: [0.2126, 0.7152, 0.0722],
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gamma_safe_min: 0.2,
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gamma_max: 5,
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preview_gamma_epsilon: 1e-3
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};
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let cached = { ...DEFAULTS };
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let initPromise = null;
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function toNum(v, fallback) {
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const n = typeof v === "number" ? v : parseFloat(v);
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return Number.isFinite(n) ? n : fallback;
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}
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function normalize(raw) {
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const obj = raw && typeof raw === "object" ? raw : {};
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const lw = Array.isArray(obj.luma_weights) ? obj.luma_weights : DEFAULTS.luma_weights;
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return {
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version: 1,
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epsilon: toNum(obj.epsilon, DEFAULTS.epsilon),
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luma_weights: [
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toNum(lw[0], DEFAULTS.luma_weights[0]),
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toNum(lw[1], DEFAULTS.luma_weights[1]),
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toNum(lw[2], DEFAULTS.luma_weights[2])
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],
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gamma_safe_min: toNum(obj.gamma_safe_min, DEFAULTS.gamma_safe_min),
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gamma_max: toNum(obj.gamma_max, DEFAULTS.gamma_max),
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preview_gamma_epsilon: toNum(obj.preview_gamma_epsilon, DEFAULTS.preview_gamma_epsilon)
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};
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}
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function getOpsConstants() {
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return cached;
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}
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function initOpsConstants() {
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initPromise ?? (initPromise = (async () => {
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try {
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const url = new URL("../shared/ops_constants.json", import.meta.url);
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const res = await fetch(url, { cache: "no-store" });
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if (!res.ok) {
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console.warn("[ImageOps] ops_constants.json fetch failed:", res.status, res.statusText, "\u2014 using defaults");
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return;
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}
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cached = normalize(await res.json());
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} catch (err) {
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console.warn("[ImageOps] ops_constants.json fetch error \u2014 using defaults:", err);
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}
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})());
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return initPromise;
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}
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export {
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getOpsConstants,
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initOpsConstants
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};
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