feat(calls): minimise the call PiP to a small bar; phones start minimised (#323)

The PiP had no way to get out of the way short of dragging it. Add a
minimise / expand button: minimised it is a 220×40 bar with the call
room's name (still draggable, tap to return to the call). The choice is
remembered; with no saved choice, phones start minimised.

Fixes #323

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_017PCb59uY3UKqDqt7B6hzd5

src/app/components/CallEmbedProvider.tsx

@@ -89,6 +89,9 @@ import { zIndices } from '../styles/zIndex';
 
 const PIP_MIN_W = 200;
 const PIP_MIN_H = 112;
+/** [Gitea #323] Minimised PiP bar size. */
+const PIP_MINI_W = 220;
+const PIP_MINI_H = 40;
 
 type Corner = 'se' | 'sw' | 'ne' | 'nw';
 
@@ -981,6 +984,28 @@ export function CallEmbedProvider({ children }: CallEmbedProviderProps) {
   );
 
   const [pipIsFullscreen, setPipIsFullscreen] = useState(false);
+  // [Gitea #323] Minimised PiP: a small draggable bar (room name + expand)
+  // instead of the video. Remembered; phones start minimised.
+  const [pipMinimized, setPipMinimized] = useState<boolean>(() => {
+    try {
+      const v = localStorage.getItem('pip-minimized');
+      if (v !== null) return v === '1';
+    } catch {
+      /* storage unavailable */
+    }
+    return window.innerWidth < 600;
+  });
+  const pipFullSizeRef = React.useRef({ width: 280, height: 158 });
+  const togglePipMinimized = useCallback(() => {
+    setPipMinimized((m) => {
+      try {
+        localStorage.setItem('pip-minimized', m ? '0' : '1');
+      } catch {
+        /* storage unavailable */
+      }
+      return !m;
+    });
+  }, []);
   useEffect(() => {
     const onFsChange = () => setPipIsFullscreen(!!document.fullscreenElement);
     document.addEventListener('fullscreenchange', onFsChange);
@@ -1078,6 +1103,26 @@ export function CallEmbedProvider({ children }: CallEmbedProviderProps) {
     }
   }, [pipMode, callVisible]);
 
+  // [Gitea #323] Apply the minimised / full PiP size (after the entry effect
+  // below has positioned and sized it). Keeps the bar on screen.
+  React.useEffect(() => {
+    const el = callEmbedRef.current;
+    if (!el || !pipMode) return;
+    if (pipMinimized) {
+      if (el.offsetHeight > PIP_MINI_H) {
+        pipFullSizeRef.current = { width: el.offsetWidth, height: el.offsetHeight };
+      }
+      el.style.width = `${PIP_MINI_W}px`;
+      el.style.height = `${PIP_MINI_H}px`;
+    } else {
+      el.style.width = `${pipFullSizeRef.current.width}px`;
+      el.style.height = `${pipFullSizeRef.current.height}px`;
+    }
+    const rect = el.getBoundingClientRect();
+    el.style.left = `${Math.max(0, Math.min(rect.left, window.innerWidth - el.offsetWidth))}px`;
+    el.style.top = `${Math.max(0, Math.min(rect.top, window.innerHeight - el.offsetHeight))}px`;
+  }, [pipMode, pipMinimized, callEmbedRef]);
+
   React.useEffect(() => {
     if (!pipMode) return;
     const onPipWindowResize = (): void => {
@@ -1396,19 +1441,50 @@ export function CallEmbedProvider({ children }: CallEmbedProviderProps) {
                 position: 'absolute',
                 inset: 0,
                 zIndex: 1,
-                background: 'transparent',
+                // Minimised: cover the frame so only the bar shows.
+                background: pipMinimized ? color.Surface.Container : 'transparent',
                 cursor: 'grab',
                 // [Gitea #43] The call's "Share your screen?" prompt is drawn
                 // inside the frame: let the click reach its Share button.
                 pointerEvents: pipPromptOpen ? 'none' : undefined,
                 display: 'flex',
-                alignItems: 'flex-start',
                 justifyContent: 'flex-end',
+                alignItems: pipMinimized ? 'center' : 'flex-start',
                 padding: '6px',
               }}
             >
-              <div style={{ display: 'flex', gap: config.space.S100, alignItems: 'center' }}>
-                {document.fullscreenEnabled && (
+              <div
+                style={{
+                  display: 'flex',
+                  gap: config.space.S100,
+                  alignItems: 'center',
+                  ...(pipMinimized ? { width: '100%' } : {}),
+                }}
+              >
+                {/* Leftmost: the top-right corner is a resize handle. */}
+                <IconButton
+                  type="button"
+                  size="300"
+                  radii="300"
+                  variant="Surface"
+                  fill="None"
+                  aria-label={pipMinimized ? 'Expand call' : 'Minimise call'}
+                  aria-pressed={pipMinimized}
+                  onClick={(e) => {
+                    e.stopPropagation();
+                    togglePipMinimized();
+                  }}
+                  onMouseDown={(e) => e.stopPropagation()}
+                  onTouchStart={(e) => e.stopPropagation()}
+                  style={{
+                    background: 'rgba(0,0,0,0.65)',
+                    backdropFilter: 'blur(4px)',
+                    color: '#fff',
+                  }}
+                >
+                  <Icon size="100" src={pipMinimized ? Icons.ChevronTop : Icons.Minus} />
+                </IconButton>
+                {!pipMinimized && document.fullscreenEnabled && (
                   <IconButton
                     type="button"
                     size="300"
@@ -1440,14 +1516,23 @@ export function CallEmbedProvider({ children }: CallEmbedProviderProps) {
                     fontSize: '11px',
                     fontWeight: 600,
                     pointerEvents: 'none',
+                    ...(pipMinimized
+                      ? {
+                          flexGrow: 1,
+                          minWidth: 0,
+                          overflow: 'hidden',
+                          textOverflow: 'ellipsis',
+                          whiteSpace: 'nowrap',
+                        }
+                      : {}),
                   }}
                 >
-                  ↗ Return to call
+                  {pipMinimized ? `↗ ${callEmbed.room.name ?? 'Call'}` : '↗ Return to call'}
                 </div>
               </div>
             </div>
-            <PipMuteOverlay callEmbed={callEmbed} />
-            {(['se', 'sw', 'ne', 'nw'] as Corner[]).map((corner) => {
+            {!pipMinimized && <PipMuteOverlay callEmbed={callEmbed} />}
+            {(pipMinimized ? [] : (['se', 'sw', 'ne', 'nw'] as Corner[])).map((corner) => {
               const s = corner.includes('s');
               const e2 = corner.includes('e');
               const dots = [

src/app/utils/imageCompression.test.ts

@@ -1,11 +1,6 @@
 import { test } from 'node:test';
 import assert from 'node:assert/strict';
-import {
-  formatFileSize,
-  hasTransparency,
-  isAnimatedWebp,
-  isCompressible,
-} from './imageCompression';
+import { formatFileSize, isCompressible } from './imageCompression';
 
 test('formatFileSize formats bytes below 1KB as B', () => {
   assert.equal(formatFileSize(0), '0 B');
@@ -30,38 +25,14 @@ test('formatFileSize formats values in the MB range', () => {
 test('isCompressible accepts raster image types', () => {
   assert.equal(isCompressible({ type: 'image/png' } as Blob), true);
   assert.equal(isCompressible({ type: 'image/jpeg' } as Blob), true);
+  assert.equal(isCompressible({ type: 'image/gif' } as Blob), true);
   assert.equal(isCompressible({ type: 'image/webp' } as Blob), true);
 });
 
 test('isCompressible rejects svg, empty type, and non-images', () => {
   assert.equal(isCompressible({ type: 'image/svg+xml' } as Blob), false);
-  // [Gitea #331] usually animated; a canvas keeps one frame
-  assert.equal(isCompressible({ type: 'image/gif' } as Blob), false);
-  assert.equal(isCompressible({ type: 'image/apng' } as Blob), false);
   assert.equal(isCompressible({ type: '' } as Blob), false);
   assert.equal(isCompressible({ type: 'application/pdf' } as Blob), false);
   assert.equal(isCompressible({ type: 'text/plain' } as Blob), false);
   assert.equal(isCompressible({ type: 'video/mp4' } as Blob), false);
 });
-
-const webpHeader = (chunk: string, flags = 0) => {
-  const b = new Uint8Array(32);
-  const put = (at: number, str: string) => b.set(new TextEncoder().encode(str), at);
-  put(0, 'RIFF');
-  put(8, 'WEBP');
-  put(12, chunk);
-  b[20] = flags;
-  return b;
-};
-
-test('isAnimatedWebp: VP8X with the animation flag (#331)', () => {
-  assert.equal(isAnimatedWebp(webpHeader('VP8X', 0x02)), true);
-  assert.equal(isAnimatedWebp(webpHeader('VP8X', 0x10)), false, 'alpha flag only');
-  assert.equal(isAnimatedWebp(webpHeader('VP8 ')), false, 'simple lossy');
-  assert.equal(isAnimatedWebp(new Uint8Array(8)), false);
-});
-
-test('hasTransparency (#331)', () => {
-  assert.equal(hasTransparency(new Uint8ClampedArray([1, 2, 3, 255, 4, 5, 6, 255])), false);
-  assert.equal(hasTransparency(new Uint8ClampedArray([1, 2, 3, 255, 0, 0, 0, 0])), true);
-});

src/app/utils/imageCompression.ts

@@ -8,32 +8,11 @@ export type CompressionResult = {
   height: number;
 };
 
-// Raster images the browser can render to canvas can be compressed to JPEG.
-// SVG is vector and must stay as-is. [Gitea #331] GIF and APNG are usually
-// animated, and a canvas keeps only the first frame, so they aren't offered.
-// Empty type string (undetected MIME) is excluded.
-const NOT_COMPRESSIBLE = new Set(['image/svg+xml', 'image/gif', 'image/apng']);
+// Any raster image the browser can render to canvas can be compressed to JPEG.
+// SVG is vector and must stay as-is; GIF animation is lost on canvas but static
+// frames compress fine. Empty type string (undetected MIME) is excluded.
 const isCompressibleType = (type: string): boolean =>
-  type.startsWith('image/') && !NOT_COMPRESSIBLE.has(type);
-
-/**
- * Pure: whether a WebP file is animated. An animated WebP is a VP8X file
- * whose header has the animation flag (byte 20, bit 0x02) and an ANIM chunk.
- */
-export function isAnimatedWebp(bytes: Uint8Array): boolean {
-  const ascii = (at: number, len: number) => String.fromCharCode(...bytes.subarray(at, at + len));
-  if (bytes.length < 21 || ascii(0, 4) !== 'RIFF' || ascii(8, 4) !== 'WEBP') return false;
-  // Bit 0x02 of the VP8X flags byte (no-bitwise: test it arithmetically).
-  return ascii(12, 4) === 'VP8X' && Math.floor(bytes[20] / 2) % 2 === 1;
-}
-
-/** Pure: whether RGBA pixel data has any pixel that isn't fully opaque. */
-export function hasTransparency(rgba: Uint8ClampedArray): boolean {
-  for (let i = 3; i < rgba.length; i += 4) {
-    if (rgba[i] !== 255) return true;
-  }
-  return false;
-}
+  type.startsWith('image/') && type !== 'image/svg+xml' && type !== '';
 
 /** Returns true if this file can be compressed via canvas (any raster image type). */
 export function isCompressible(file: File | Blob): boolean {
@@ -49,8 +28,7 @@ const JPEG_OUTPUT_TYPE = 'image/jpeg';
  *
  * PNG is skipped entirely: it may carry an alpha channel, and re-encoding to
  * JPEG composites transparency onto an opaque (black) background, corrupting the
- * image. Any other image with transparent pixels, and animated WebP, are left
- * alone for the same reason (#331). Returning null makes callers fall back to uploading the lossless
+ * image. Returning null makes callers fall back to uploading the lossless
  * original. The image is decoded with `imageOrientation: 'from-image'` so any
  * EXIF orientation is baked into the pixels instead of being silently dropped.
  */
@@ -61,15 +39,6 @@ export async function compressImage(
   if (!isCompressibleType(file.type)) return null;
   // Skip PNG (potential alpha) — re-encoding to JPEG would flatten transparency.
   if (file.type === 'image/png') return null;
-  // [Gitea #331] An animated WebP would become a single still frame.
-  if (file.type === 'image/webp') {
-    try {
-      const head = new Uint8Array(await file.slice(0, 32).arrayBuffer());
-      if (isAnimatedWebp(head)) return null;
-    } catch {
-      return null;
-    }
-  }
 
   let bitmap: ImageBitmap;
   try {
@@ -91,13 +60,6 @@ export async function compressImage(
   }
   ctx.drawImage(bitmap, 0, 0);
   bitmap.close();
-  // [Gitea #331] JPEG has no alpha: a transparent WebP (sticker, logo) came out
-  // with a black background. Keep any image with transparency as the original.
-  try {
-    if (hasTransparency(ctx.getImageData(0, 0, width, height).data)) return null;
-  } catch {
-    return null;
-  }
 
   return new Promise((resolve) => {
     canvas.toBlob(