chore: improve OCR button and display on mobile (#28926)

* chore: improve OCR button and display on mobile

* Refactor

* format

* simplify ocr toggle button

---------

Co-authored-by: shenlong-tanwen <139912620+shalong-tanwen@users.noreply.github.com>

mobile/lib/presentation/widgets/asset_viewer/bottom_bar.widget.dart

@@ -12,6 +12,7 @@ import 'package:immich_mobile/presentation/widgets/action_buttons/edit_image_act
 import 'package:immich_mobile/presentation/widgets/action_buttons/restore_action_button.widget.dart';
 import 'package:immich_mobile/presentation/widgets/action_buttons/share_action_button.widget.dart';
 import 'package:immich_mobile/presentation/widgets/action_buttons/upload_action_button.widget.dart';
+import 'package:immich_mobile/presentation/widgets/asset_viewer/ocr_toggle_button.widget.dart';
 import 'package:immich_mobile/providers/asset_viewer/asset_viewer.provider.dart';
 import 'package:immich_mobile/providers/infrastructure/readonly_mode.provider.dart';
 import 'package:immich_mobile/providers/infrastructure/timeline.provider.dart';
@@ -100,6 +101,7 @@ class ViewerBottomBar extends ConsumerWidget {
                       child: Column(
                         mainAxisSize: MainAxisSize.min,
                         children: [
+                          OcrToggleButton(asset: asset),
                           if (asset.isVideo) VideoControls(videoPlayerName: asset.heroTag),
                           if (!isReadonlyModeEnabled)
                             Row(mainAxisAlignment: MainAxisAlignment.spaceEvenly, children: actions),

mobile/lib/presentation/widgets/asset_viewer/ocr_overlay.widget.dart

@@ -157,6 +157,55 @@ class _OcrBoxes extends StatelessWidget {
     final cx = viewportWidth / 2 + position.dx;
     final cy = viewportHeight / 2 + position.dy;
 
+    final quads = <List<Offset>>[];
+    final boxes = <Widget>[];
+
+    for (final entry in ocrData.asMap().entries) {
+      final index = entry.key;
+      final ocr = entry.value;
+
+      // Map normalized image coords (0–1) to viewport space
+      final x1 = cx + (ocr.x1 - 0.5) * imageWidth * scale;
+      final y1 = cy + (ocr.y1 - 0.5) * imageHeight * scale;
+      final x2 = cx + (ocr.x2 - 0.5) * imageWidth * scale;
+      final y2 = cy + (ocr.y2 - 0.5) * imageHeight * scale;
+      final x3 = cx + (ocr.x3 - 0.5) * imageWidth * scale;
+      final y3 = cy + (ocr.y3 - 0.5) * imageHeight * scale;
+      final x4 = cx + (ocr.x4 - 0.5) * imageWidth * scale;
+      final y4 = cy + (ocr.y4 - 0.5) * imageHeight * scale;
+
+      // Bounding rectangle for hit testing and Positioned placement
+      final minX = [x1, x2, x3, x4].reduce((a, b) => a < b ? a : b);
+      final maxX = [x1, x2, x3, x4].reduce((a, b) => a > b ? a : b);
+      final minY = [y1, y2, y3, y4].reduce((a, b) => a < b ? a : b);
+      final maxY = [y1, y2, y3, y4].reduce((a, b) => a > b ? a : b);
+
+      quads.add([Offset(x1, y1), Offset(x2, y2), Offset(x3, y3), Offset(x4, y4)]);
+
+      boxes.add(
+        _OcrBoxItem(
+          key: ValueKey(index),
+          ocr: ocr,
+          index: index,
+          isSelected: selectedBoxIndex == index,
+          points: [
+            Offset(x1 - minX, y1 - minY),
+            Offset(x2 - minX, y2 - minY),
+            Offset(x3 - minX, y3 - minY),
+            Offset(x4 - minX, y4 - minY),
+          ],
+          left: minX,
+          top: minY,
+          width: maxX - minX,
+          height: maxY - minY,
+          angle: math.atan2(y2 - y1, x2 - x1),
+          labelDx: (minX + maxX) / 2 - minX,
+          labelDy: (minY + maxY) / 2 - minY,
+          onSelectionChanged: onSelectionChanged,
+        ),
+      );
+    }
+
     return GestureDetector(
       behavior: HitTestBehavior.translucent,
       onTap: () => onSelectionChanged(null),
@@ -165,47 +214,13 @@ class _OcrBoxes extends StatelessWidget {
           children: [
             // Fills the viewport so taps outside boxes deselect
             SizedBox(width: viewportWidth, height: viewportHeight),
-            ...ocrData.asMap().entries.map((entry) {
-              final index = entry.key;
-              final ocr = entry.value;
-
-              // Map normalized image coords (0–1) to viewport space
-              final x1 = cx + (ocr.x1 - 0.5) * imageWidth * scale;
-              final y1 = cy + (ocr.y1 - 0.5) * imageHeight * scale;
-              final x2 = cx + (ocr.x2 - 0.5) * imageWidth * scale;
-              final y2 = cy + (ocr.y2 - 0.5) * imageHeight * scale;
-              final x3 = cx + (ocr.x3 - 0.5) * imageWidth * scale;
-              final y3 = cy + (ocr.y3 - 0.5) * imageHeight * scale;
-              final x4 = cx + (ocr.x4 - 0.5) * imageWidth * scale;
-              final y4 = cy + (ocr.y4 - 0.5) * imageHeight * scale;
-
-              // Bounding rectangle for hit testing and Positioned placement
-              final minX = [x1, x2, x3, x4].reduce((a, b) => a < b ? a : b);
-              final maxX = [x1, x2, x3, x4].reduce((a, b) => a > b ? a : b);
-              final minY = [y1, y2, y3, y4].reduce((a, b) => a < b ? a : b);
-              final maxY = [y1, y2, y3, y4].reduce((a, b) => a > b ? a : b);
-
-              return _OcrBoxItem(
-                key: ValueKey(index),
-                ocr: ocr,
-                index: index,
-                isSelected: selectedBoxIndex == index,
-                points: [
-                  Offset(x1 - minX, y1 - minY),
-                  Offset(x2 - minX, y2 - minY),
-                  Offset(x3 - minX, y3 - minY),
-                  Offset(x4 - minX, y4 - minY),
-                ],
-                left: minX,
-                top: minY,
-                width: maxX - minX,
-                height: maxY - minY,
-                angle: math.atan2(y2 - y1, x2 - x1),
-                labelDx: (minX + maxX) / 2 - minX,
-                labelDy: (minY + maxY) / 2 - minY,
-                onSelectionChanged: onSelectionChanged,
-              );
-            }),
+            // Dark scrim with the text boxes punched out
+            Positioned.fill(
+              child: IgnorePointer(
+                child: CustomPaint(painter: _OcrScrimPainter(quads: quads)),
+              ),
+            ),
+            ...boxes,
           ],
         ),
       ),
@@ -307,6 +322,35 @@ class _OcrBoxItem extends StatelessWidget {
   }
 }
 
+class _OcrScrimPainter extends CustomPainter {
+  final List<List<Offset>> quads;
+
+  const _OcrScrimPainter({required this.quads});
+
+  @override
+  void paint(Canvas canvas, Size size) {
+    // Fill the whole viewport, then subtract each text quad using the even-odd
+    // rule so the original image shows through the boxes.
+    final path = Path()
+      ..fillType = PathFillType.evenOdd
+      ..addRect(Offset.zero & size);
+
+    for (final quad in quads) {
+      path
+        ..moveTo(quad[0].dx, quad[0].dy)
+        ..lineTo(quad[1].dx, quad[1].dy)
+        ..lineTo(quad[2].dx, quad[2].dy)
+        ..lineTo(quad[3].dx, quad[3].dy)
+        ..close();
+    }
+
+    canvas.drawPath(path, Paint()..color = Colors.black54);
+  }
+
+  @override
+  bool shouldRepaint(_OcrScrimPainter oldDelegate) => true;
+}
+
 class _OcrBoxPainter extends CustomPainter {
   final List<Offset> points;
   final bool isSelected;
@@ -322,7 +366,7 @@ class _OcrBoxPainter extends CustomPainter {
       ..strokeWidth = 2.0;
 
     final fillPaint = Paint()
-      ..color = (isSelected ? colorScheme.primary : colorScheme.secondary).withValues(alpha: 0.1)
+      ..color = isSelected ? colorScheme.primary.withValues(alpha: 0.45) : Colors.transparent
       ..style = PaintingStyle.fill;
 
     final path = Path()

mobile/lib/presentation/widgets/asset_viewer/ocr_toggle_button.widget.dart

@@ -0,0 +1,42 @@
+import 'package:flutter/material.dart';
+import 'package:hooks_riverpod/hooks_riverpod.dart';
+import 'package:immich_mobile/domain/models/asset/base_asset.model.dart';
+import 'package:immich_mobile/extensions/build_context_extensions.dart';
+import 'package:immich_mobile/providers/asset_viewer/asset_viewer.provider.dart';
+import 'package:immich_mobile/providers/infrastructure/ocr.provider.dart';
+
+class OcrToggleButton extends ConsumerWidget {
+  final BaseAsset asset;
+  const OcrToggleButton({super.key, required this.asset});
+
+  @override
+  Widget build(BuildContext context, WidgetRef ref) {
+    final asset = this.asset;
+    final hasOcr = asset is RemoteAsset && ref.watch(ocrAssetProvider(asset.id)).valueOrNull?.isNotEmpty == true;
+    final showingOcr = ref.watch(assetViewerProvider.select((s) => s.showingOcr));
+
+    return AnimatedSwitcher(
+      duration: Durations.short4,
+      child: !hasOcr
+          ? const SizedBox.shrink()
+          : Align(
+              alignment: Alignment.centerRight,
+              child: Padding(
+                padding: const EdgeInsets.only(right: 32, bottom: 8),
+                child: Material(
+                  color: showingOcr ? context.primaryColor : Colors.black.withValues(alpha: 0.4),
+                  shape: const CircleBorder(),
+                  clipBehavior: Clip.antiAlias,
+                  child: InkWell(
+                    onTap: ref.read(assetViewerProvider.notifier).toggleOcr,
+                    child: const Padding(
+                      padding: EdgeInsets.all(10.0),
+                      child: Icon(Icons.text_fields_rounded, size: 22, color: Colors.white),
+                    ),
+                  ),
+                ),
+              ),
+            ),
+    );
+  }
+}

mobile/lib/presentation/widgets/asset_viewer/viewer_top_app_bar.widget.dart

@@ -13,7 +13,6 @@ import 'package:immich_mobile/providers/activity.provider.dart';
 import 'package:immich_mobile/providers/asset_viewer/asset_viewer.provider.dart';
 import 'package:immich_mobile/providers/infrastructure/asset_viewer/asset.provider.dart';
 import 'package:immich_mobile/providers/infrastructure/current_album.provider.dart';
-import 'package:immich_mobile/providers/infrastructure/ocr.provider.dart';
 import 'package:immich_mobile/providers/infrastructure/readonly_mode.provider.dart';
 import 'package:immich_mobile/providers/routes.provider.dart';
 import 'package:immich_mobile/providers/user.provider.dart';
@@ -36,7 +35,6 @@ class ViewerTopAppBar extends ConsumerWidget implements PreferredSizeWidget {
     final isOwner = asset is RemoteAsset && asset.ownerId == user?.id;
     final isInLockedView = ref.watch(inLockedViewProvider);
     final isReadonlyModeEnabled = ref.watch(readonlyModeProvider);
-    final hasOcr = asset is RemoteAsset && ref.watch(ocrAssetProvider(asset.id)).valueOrNull?.isNotEmpty == true;
 
     final showingDetails = ref.watch(assetViewerProvider.select((state) => state.showingDetails));
 
@@ -48,15 +46,8 @@ class ViewerTopAppBar extends ConsumerWidget implements PreferredSizeWidget {
     double opacity = ref.watch(assetViewerProvider.select((s) => s.backgroundOpacity)) * (showingControls ? 1 : 0);
 
     final originalTheme = context.themeData;
-    final showingOcr = ref.watch(assetViewerProvider.select((state) => state.showingOcr));
 
     final actions = <Widget>[
-      if (hasOcr)
-        IconButton(
-          icon: Icon(showingOcr ? Icons.text_fields : Icons.text_fields_outlined),
-          onPressed: ref.read(assetViewerProvider.notifier).toggleOcr,
-          color: showingOcr ? context.primaryColor : null,
-        ),
       if (asset.isMotionPhoto) const MotionPhotoActionButton(iconOnly: true),
       if (album != null && album.isActivityEnabled && album.isShared)
         IconButton(