Add performer-poster-backdrop plugin (#648)

plugins/performer-poster-backdrop/README.md

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+# Performer Poster Backdrop (Stash UI Plugin)
+
+Adds a blurred poster-style backdrop behind performer headers using the performer’s poster image.
+
+![Performer Poster Backdrop example](https://raw.githubusercontent.com/worryaboutstuff/performer-poster-backdrop/main/assets/performer-poster-backdrop-example.png)
+
+
+## Features
+
+- Applies only to **Performer pages**
+- Uses the performer’s **poster image** as a background layer
+- Adjustable:
+  - Opacity
+  - Blur strength
+  - Vertical image alignment
+- Supports **per-performer Y-offset overrides**
+- Blank settings automatically fall back to defaults
+
+## Installation
+
+1. Copy the following files into your Stash UI plugins directory:
+   - `performer-poster-backdrop.yml`
+   - `performer-poster-backdrop.js`
+   - `performer-poster-backdrop.css`
+
+2. In Stash, go to **Settings → Plugins**
+3. Find **Performer Poster Backdrop**
+4. Adjust settings if desired and click **Confirm**
+5. Refresh a performer page
+
+## Settings
+
+### Backdrop opacity
+Controls how visible the backdrop is.
+
+- Range: `0`–`1`
+- Default: `1`
+- Examples:
+  - `0.7` → subtle
+  - `0.5` → very soft
+  - `0` → invisible
+
+Leaving this field blank uses the default.
+
+### Backdrop blur
+Controls how blurred the backdrop appears (in pixels).
+
+- Default: `10`
+- Examples:
+  - `5` → light blur
+  - `15` → strong blur
+  - `0` → no blur
+
+Leaving this field blank uses the default.
+
+### Default Y offset
+Controls the vertical alignment of the backdrop image.
+
+- Range: `0`–`100`
+- Default: `20`
+- Meaning:
+  - `0` → favor top of image
+  - `50` → center
+  - `100` → favor bottom
+
+Leaving this field blank uses the default.
+
+## Per-performer Y overrides
+
+Use this when a specific performer’s poster needs different vertical positioning.
+
+Enter overrides as a **comma-separated list** in a single text field.
+
+### Format
+
+`PERFORMER_ID:OFFSET`
+
+### Example
+
+`142:35, 219:20, 501:50`
+
+
+
+Accepted separators:
+- `:` (recommended)
+- `=`
+- `-`
+
+Whitespace is ignored.

plugins/performer-poster-backdrop/performer-poster-backdrop.css

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+.pb-hero {
+  position: absolute;
+  inset: 2px;
+
+  background-size: cover;
+  background-position: center var(--pb-y, 20%);
+
+  opacity: var(--pb-opacity, 1);
+  filter: blur(var(--pb-blur, 10px));
+  transform: scale(1.2);
+  z-index: 0;
+  pointer-events: none;
+}
+
+.pb-hero::after {
+  content: "";
+  position: absolute;
+  inset: 0;
+
+  background:
+    radial-gradient(
+      ellipse at center,
+      rgba(0,0,0,0.0) 0%,
+      rgba(0,0,0,0.35) 55%,
+      rgba(0,0,0,0.75) 100%
+    ),
+    linear-gradient(
+      to bottom,
+      rgba(0,0,0,0.15),
+      rgba(0,0,0,0.75)
+    );
+
+  box-shadow:
+    inset 0 0 0 1px rgba(255,255,255,0.025),
+    inset 0 14px 28px rgba(0,0,0,0.55),
+    inset 0 -22px 36px rgba(0,0,0,0.85);
+}
+
+/* IMPORTANT: only the REAL header */
+#performer-page .detail-header.full-width {
+  position: relative;
+  overflow: hidden;
+}
+
+/* Lift content above banner ONLY in the REAL header */
+#performer-page .detail-header.full-width > *:not(.pb-hero) {
+  position: relative;
+  z-index: 1;
+}
+
+/* Hide while editing performer */
+#performer-page .detail-header.edit.full-width .pb-hero {
+  display: none;
+}

plugins/performer-poster-backdrop/performer-poster-backdrop.js

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+(function () {
+  const HERO_CLASS = "pb-hero";
+  const PLUGIN_ID = "performer-poster-backdrop";
+
+  // HARD DEFAULTS (used when fields are blank)
+  const DEFAULTS = {
+    opacity: 1,   // 0..1
+    blur: 10,     // px
+    y: 20,        // %
+  };
+
+  let opacity = DEFAULTS.opacity;
+  let blur = DEFAULTS.blur;
+  let defaultY = DEFAULTS.y;
+  let overrides = new Map();
+
+  let lastSettingsFetch = 0;
+
+  const isBlank = (v) =>
+    v === null || v === undefined || String(v).trim() === "";
+
+  function isPerformerRoute() {
+    return /^\/performers\/\d+/.test(location.pathname);
+  }
+
+  function getPerformerIdFromPath() {
+    const m = location.pathname.match(/^\/performers\/(\d+)/);
+    return m ? String(Number(m[1])) : null;
+  }
+
+  function getHeader() {
+    return document.querySelector("#performer-page .detail-header.full-width");
+  }
+
+  function getStickyHeader() {
+    return document.querySelector("#performer-page .sticky.detail-header");
+  }
+
+  function getPosterImg() {
+    return (
+      document.querySelector("#performer-page .detail-header-image img.performer") ||
+      document.querySelector("#performer-page img.performer")
+    );
+  }
+
+  function clamp(n, min, max, fallback) {
+    const x = Number(n);
+    if (!Number.isFinite(x)) return fallback;
+    return Math.min(max, Math.max(min, x));
+  }
+
+  // COMMA-SEPARATED overrides: "142:35, 219:20"
+  function parseOverrides(text) {
+    const map = new Map();
+    if (isBlank(text)) return map;
+
+    text.split(",").forEach((chunk) => {
+      const s = chunk.trim();
+      if (!s) return;
+
+      // Accept 142:35, 142-35, 142=35
+      const m = s.match(/^(\d+)\s*[:=-]\s*(\d{1,3})$/);
+      if (!m) return;
+
+      const id = String(Number(m[1]));
+      const pct = clamp(m[2], 0, 100, DEFAULTS.y);
+      map.set(id, pct);
+    });
+
+    return map;
+  }
+
+  function removeHero(el) {
+    el?.querySelector("." + HERO_CLASS)?.remove();
+  }
+
+  function upsertHero(header, url) {
+    let hero = header.querySelector("." + HERO_CLASS);
+    if (!hero) {
+      hero = document.createElement("div");
+      hero.className = HERO_CLASS;
+      header.prepend(hero);
+    }
+    hero.style.backgroundImage = `url("${url}")`;
+    return hero;
+  }
+
+  function apply(hero) {
+    hero.style.setProperty("--pb-opacity", opacity);
+    hero.style.setProperty("--pb-blur", `${blur}px`);
+
+    const pid = getPerformerIdFromPath();
+    const y = pid && overrides.has(pid) ? overrides.get(pid) : defaultY;
+    hero.style.setProperty("--pb-y", `${y}%`);
+  }
+
+  async function refreshSettings() {
+    if (Date.now() - lastSettingsFetch < 5000) return;
+    lastSettingsFetch = Date.now();
+
+    try {
+      const res = await fetch("/graphql", {
+        method: "POST",
+        headers: { "Content-Type": "application/json" },
+        body: JSON.stringify({
+          query: `{ configuration { plugins } }`,
+        }),
+      });
+
+      if (!res.ok) return;
+
+      const cfg = (await res.json())
+        ?.data?.configuration?.plugins?.[PLUGIN_ID];
+
+      if (!cfg) return;
+
+      opacity = isBlank(cfg.opacity)
+        ? DEFAULTS.opacity
+        : clamp(cfg.opacity, 0, 1, DEFAULTS.opacity);
+
+      blur = isBlank(cfg.blur)
+        ? DEFAULTS.blur
+        : clamp(cfg.blur, 0, 100, DEFAULTS.blur);
+
+      defaultY = isBlank(cfg.defaultYOffset)
+        ? DEFAULTS.y
+        : clamp(cfg.defaultYOffset, 0, 100, DEFAULTS.y);
+
+      overrides = isBlank(cfg.perPerformerOffsets)
+        ? new Map()
+        : parseOverrides(cfg.perPerformerOffsets);
+
+      const hero = getHeader()?.querySelector("." + HERO_CLASS);
+      if (hero) apply(hero);
+    } catch {
+      // silent fail — plugin should never break UI
+    }
+  }
+
+  function run() {
+    removeHero(getStickyHeader());
+
+    const header = getHeader();
+    if (!header || !isPerformerRoute()) return removeHero(header);
+
+    const img = getPosterImg();
+    if (!img) return;
+
+    const hero = upsertHero(header, img.currentSrc || img.src);
+    apply(hero);
+    refreshSettings();
+  }
+
+  new MutationObserver(run).observe(document.body, {
+    childList: true,
+    subtree: true,
+  });
+
+  ["load", "resize", "popstate"].forEach((e) =>
+    window.addEventListener(e, () => setTimeout(run, 50))
+  );
+
+  setTimeout(run, 50);
+})();

plugins/performer-poster-backdrop/performer-poster-backdrop.yml

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+name: Performer Poster Backdrop
+description: Adds a blurred poster backdrop to performer pages.
+version: 1.0.3
+
+ui:
+  javascript:
+    - performer-poster-backdrop.js
+  css:
+    - performer-poster-backdrop.css
+
+settings:
+  opacity:
+    displayName: Backdrop opacity
+    description: "0–1 (leave blank for default: 1)"
+    type: STRING
+
+  blur:
+    displayName: Backdrop blur
+    description: "Pixels (leave blank for default: 10)"
+    type: STRING
+
+  defaultYOffset:
+    displayName: Default Y offset
+    description: "Background position % (leave blank for default: 20)"
+    type: STRING
+
+  perPerformerOffsets:
+    displayName: Per-performer Y overrides
+    description: "Comma seperated: performerId:percent (blank = none)"
+    type: STRING