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(function () {
'use strict';
var SVG_NS = 'http://www.w3.org/2000/svg';
var XLINK = 'http://www.w3.org/1999/xlink';
var MAX_MAP = 192;
var SIZE_STEP = 8;
var CACHE_LIMIT = 48;
var SURFACES = [
['#nav', 'glass--soft'],
['#rightside > div > button, #rightside > button', 'glass--soft'],
['#pagination .page-number, #pagination .extend', 'glass--soft'],
['.tag-cloud-list a', 'glass--soft'],
['#article-container .tag-list a', 'glass--soft'],
['#post .post-copyright', 'glass--soft'],
['#footer-wrap', 'glass--soft'],
['.pagination-post .pagination-related', 'glass--soft'],
['.relatedPosts .relatedPosts-list .pagination-related', 'glass--soft'],
['#archive .article-sort-item:not(.year)', 'glass--soft'],
['#aside-content .card-widget', 'glass--medium'],
['#card-toc, #toc-div', 'glass--medium'],
['#article-container .note', 'glass--medium'],
['#recent-posts .recent-post-item', 'glass--strong'],
['#post, #page, #archive, #tag, #category', 'glass--strong'],
['#article-container figure.highlight', 'glass--dense'],
['#article-container pre:not(figure.highlight pre)','glass--dense'],
['#article-container blockquote', 'glass--dense'],
['#article-container .table-wrap', 'glass--dense'],
['#local-search .search-dialog, .search-dialog', 'glass--floating'],
['#sidebar-menus', 'glass--floating']
];
function backdropSupported() {
if (!window.CSS || !CSS.supports) return false;
return CSS.supports('backdrop-filter', 'blur(1px)') ||
CSS.supports('-webkit-backdrop-filter', 'blur(1px)');
}
function chromiumLike() {
var uad = navigator.userAgentData;
if (uad && uad.brands && uad.brands.length) {
for (var i = 0; i < uad.brands.length; i++) {
if (/Chromium/i.test(uad.brands[i].brand)) return true;
}
return false;
}
var ua = navigator.userAgent;
if (/CriOS|FxiOS|EdgiOS/.test(ua)) return false;
return /Chrome\/|Chromium\/|Edg\//.test(ua);
}
var mqReduce = window.matchMedia('(prefers-reduced-transparency: reduce)');
var refract = backdropSupported() && chromiumLike() && !mqReduce.matches;
function roundedRectSDF(x, y, hw, hh, r) {
var qx = Math.abs(x) - hw + r;
var qy = Math.abs(y) - hh + r;
var mx = Math.max(qx, 0), my = Math.max(qy, 0);
return Math.min(Math.max(qx, qy), 0) + Math.sqrt(mx * mx + my * my) - r;
}
function buildMap(o) {
var w = o.w, h = o.h;
if (!(w > 0 && h > 0)) return null;
var k = Math.min(1, MAX_MAP / Math.max(w, h));
var mw = Math.max(8, Math.round(w * k));
var mh = Math.max(8, Math.round(h * k));
var hw = w / 2, hh = h / 2;
var r = Math.max(0, Math.min(o.radius || 0, Math.min(hw, hh)));
var bezel = Math.max(2, Math.min(o.bezel, Math.min(hw, hh)));
var strength = o.refraction;
if (strength <= 0.01) return null;
var depth = Math.max(1, o.edgeDepth);
var lensK = 1 - 1 / (1 + depth * depth);
var lensNorm = Math.sqrt(1 - lensK);
var gate = bezel * 0.35;
var offs = new Float32Array(mw * mh * 2);
var peak = 0, e = 1;
for (var j = 0; j < mh; j++) {
var py = ((j + 0.5) / mh) * h - hh;
for (var i = 0; i < mw; i++) {
var px = ((i + 0.5) / mw) * w - hw;
var d = roundedRectSDF(px, py, hw, hh, r);
var u = (d + bezel) / bezel;
if (u <= 0) continue;
if (u > 1) u = 1;
var t = u * lensNorm / Math.sqrt(1 - u * u * lensK);
if (d + bezel < gate) {
var g = (d + bezel) / gate;
t *= g * g * (3 - 2 * g);
}
if (t <= 0.0005) continue;
var gx = roundedRectSDF(px + e, py, hw, hh, r) -
roundedRectSDF(px - e, py, hw, hh, r);
var gy = roundedRectSDF(px, py + e, hw, hh, r) -
roundedRectSDF(px, py - e, hw, hh, r);
var len = Math.sqrt(gx * gx + gy * gy);
if (len < 1e-6) continue;
var amt = t * strength;
var p = (j * mw + i) * 2;
offs[p] = -(gx / len) * amt;
offs[p + 1] = -(gy / len) * amt;
if (Math.abs(offs[p]) > peak) peak = Math.abs(offs[p]);
if (Math.abs(offs[p + 1]) > peak) peak = Math.abs(offs[p + 1]);
}
}
if (peak < 0.01) return null;
var canvas = document.createElement('canvas');
canvas.width = mw; canvas.height = mh;
var ctx = canvas.getContext('2d');
var img = ctx.createImageData(mw, mh);
var data = img.data;
var scale = peak * 2;
for (var n = 0, q = 0; n < data.length; n += 4, q += 2) {
data[n] = (0.5 + offs[q] / scale) * 255;
data[n + 1] = (0.5 + offs[q + 1] / scale) * 255;
data[n + 2] = 0;
data[n + 3] = 255;
}
ctx.putImageData(img, 0, 0);
return { url: canvas.toDataURL(), scale: scale };
}
var host = null;
function defs() {
if (host && host.isConnected) return host.firstChild;
host = document.createElementNS(SVG_NS, 'svg');
host.setAttribute('width', '0');
host.setAttribute('height', '0');
host.setAttribute('aria-hidden', 'true');
host.style.cssText = 'position:fixed;top:0;left:0;width:0;height:0;pointer-events:none';
host.appendChild(document.createElementNS(SVG_NS, 'defs'));
document.body.appendChild(host);
return host.firstChild;
}
function el(name, attrs) {
var node = document.createElementNS(SVG_NS, name);
for (var k in attrs) {
if (Object.prototype.hasOwnProperty.call(attrs, k)) {
node.setAttribute(k, String(attrs[k]));
}
}
return node;
}
var cache = new Map(), held = new WeakMap(), seq = 0;
function buildFilter(filter, map, aberration) {
var feImage = el('feImage', { result: 'map', preserveAspectRatio: 'none' });
feImage.setAttribute('href', map.url);
feImage.setAttributeNS(XLINK, 'xlink:href', map.url);
filter.appendChild(feImage);
if (!aberration || aberration <= 0.001) {
filter.appendChild(el('feDisplacementMap', {
in: 'SourceGraphic', in2: 'map', scale: map.scale,
xChannelSelector: 'R', yChannelSelector: 'G'
}));
return feImage;
}
var scales = [map.scale * (1 + aberration), map.scale, map.scale * (1 - aberration)];
var keep = [
'1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0',
'0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 1 0',
'0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 1 0'
];
var ch = ['R', 'G', 'B'];
for (var i = 0; i < 3; i++) {
filter.appendChild(el('feDisplacementMap', {
in: 'SourceGraphic', in2: 'map', scale: scales[i],
xChannelSelector: 'R', yChannelSelector: 'G', result: 'd' + ch[i]
}));
filter.appendChild(el('feColorMatrix', {
in: 'd' + ch[i], type: 'matrix', values: keep[i], result: 'c' + ch[i]
}));
}
filter.appendChild(el('feComposite', {
in: 'cR', in2: 'cG', operator: 'arithmetic',
k1: 0, k2: 1, k3: 1, k4: 0, result: 'cRG'
}));
filter.appendChild(el('feComposite', {
in: 'cRG', in2: 'cB', operator: 'arithmetic', k1: 0, k2: 1, k3: 1, k4: 0
}));
return feImage;
}
function num(cs, prop, fallback) {
var v = parseFloat(cs.getPropertyValue(prop));
return isNaN(v) ? fallback : v;
}
function apply(element) {
if (!refract) return;
var rect = element.getBoundingClientRect();
if (rect.width < 24 || rect.height < 16) return;
var w = Math.ceil(rect.width / SIZE_STEP) * SIZE_STEP;
var h = Math.ceil(rect.height / SIZE_STEP) * SIZE_STEP;
var cs = getComputedStyle(element);
var radius = Math.max(
parseFloat(cs.borderTopLeftRadius) || 0,
parseFloat(cs.borderTopRightRadius) || 0,
parseFloat(cs.borderBottomRightRadius) || 0,
parseFloat(cs.borderBottomLeftRadius) || 0
);
if (radius > Math.min(w, h) / 2) radius = Math.min(w, h) / 2;
var o = {
w: w, h: h, radius: radius,
refraction: num(cs, '--glass-refraction', 60),
bezel: num(cs, '--glass-bezel-width', 40),
edgeDepth: num(cs, '--glass-edge-depth', 1.8),
aberration: num(cs, '--glass-chromatic', 0)
};
var key = [o.w, o.h, o.radius, o.bezel, o.refraction,
o.edgeDepth, o.aberration].join('|');
if (held.get(element) === key && element.style.getPropertyValue('--g-filter')) return;
var entry = cache.get(key);
if (!entry) {
var map = buildMap(o);
if (!map) { element.style.removeProperty('--g-filter'); return; }
var id = 'bfglass-' + (++seq);
var filter = el('filter', {
id: id, filterUnits: 'userSpaceOnUse',
'color-interpolation-filters': 'sRGB',
x: 0, y: 0, width: o.w, height: o.h
});
var feImage = buildFilter(filter, map, o.aberration);
feImage.setAttribute('x', 0); feImage.setAttribute('y', 0);
feImage.setAttribute('width', o.w); feImage.setAttribute('height', o.h);
defs().appendChild(filter);
entry = { id: id, node: filter };
cache.set(key, entry);
if (cache.size > CACHE_LIMIT) {
var first = cache.keys().next().value;
var old = cache.get(first);
if (old && old !== entry) { old.node.remove(); cache.delete(first); }
}
}
held.set(element, key);
element.style.setProperty('--g-filter', 'url(#' + entry.id + ')');
}
var tagged = [];
var ro = window.ResizeObserver ? new ResizeObserver(function (entries) {
for (var i = 0; i < entries.length; i++) apply(entries[i].target);
}) : null;
function tag() {
SURFACES.forEach(function (pair) {
var nodes;
try { nodes = document.querySelectorAll(pair[0]); }
catch (err) { return; }
for (var i = 0; i < nodes.length; i++) {
var element = nodes[i];
if (element.classList.contains('glass')) continue;
element.classList.add('glass');
pair[1].split(' ').forEach(function (c) { if (c) element.classList.add(c); });
tagged.push(element);
apply(element);
if (ro) ro.observe(element);
}
});
}
function refreshAll() {
tagged = tagged.filter(function (e) { return e.isConnected; });
tagged.forEach(apply);
}
var root = document.documentElement;
root.classList.add('glass-ready');
root.classList.add(refract ? 'glass-refract' : 'glass-plain');
function boot() {
tag();
setTimeout(tag, 400);
}
if (document.readyState === 'loading') {
document.addEventListener('DOMContentLoaded', boot);
} else {
boot();
}
window.addEventListener('load', function () { tag(); setTimeout(tag, 400); });
['pjax:complete', 'pjax:success'].forEach(function (evt) {
document.addEventListener(evt, function () {
if (ro) ro.disconnect();
tagged = [];
tag();
setTimeout(tag, 400);
});
});
var timer = 0;
window.addEventListener('resize', function () {
clearTimeout(timer);
timer = setTimeout(refreshAll, 180);
});
new MutationObserver(refreshAll).observe(root, {
attributes: true, attributeFilter: ['data-theme']
});
window.butterflyGlass = { retag: tag, refresh: refreshAll, surfaces: SURFACES };
})();
|
