thumbhash render box

mobile/lib/constants/constants.dart

@@ -26,7 +26,7 @@ const String kDownloadGroupLivePhoto = 'group_livephoto';
 
 // Timeline constants
 const int kTimelineNoneSegmentSize = 120;
-const int kTimelineAssetLoadBatchSize = 256;
+const int kTimelineAssetLoadBatchSize = 1024;
 const int kTimelineAssetLoadOppositeSize = 64;
 
 // Widget keys

mobile/lib/presentation/widgets/images/thumbnail.widget.dart

@@ -1,7 +1,6 @@
 import 'package:flutter/material.dart';
 import 'package:immich_mobile/domain/models/asset/base_asset.model.dart';
 import 'package:immich_mobile/presentation/widgets/images/image_provider.dart';
-import 'package:immich_mobile/widgets/asset_grid/thumbnail_placeholder.dart';
 import 'package:immich_mobile/widgets/common/thumbhash.dart';
 import 'package:logging/logging.dart';
 import 'package:octo_image/octo_image.dart';
@@ -37,9 +36,7 @@ class Thumbnail extends StatelessWidget {
 }
 
 OctoPlaceholderBuilder _blurHashPlaceholderBuilder(String? thumbHash, {BoxFit? fit}) {
-  return (context) => thumbHash == null
-      ? const ThumbnailPlaceholder()
-      : Thumbhash(blurhash: thumbHash, fit: fit ?? BoxFit.cover);
+  return (context) => Thumbhash(blurhash: thumbHash, fit: fit ?? BoxFit.cover);
 }
 
 OctoErrorBuilder _blurHashErrorBuilder(String? blurhash, {BaseAsset? asset, ImageProvider? provider, BoxFit? fit}) =>

mobile/lib/presentation/widgets/memory/memory_card.widget.dart

@@ -91,12 +91,7 @@ class _BlurredBackdrop extends HookWidget {
     final blurhash = asset.thumbHash;
     if (blurhash != null) {
       // Use a nice cheap blur hash image decoration
-      return Stack(
-        children: [
-          const ColoredBox(color: Color.fromRGBO(0, 0, 0, 0.2)),
-          Thumbhash(blurhash: blurhash, fit: BoxFit.cover),
-        ],
-      );
+      return Thumbhash(blurhash: blurhash, fit: BoxFit.cover);
     }
 
     // Fall back to using a more expensive image filtered

mobile/lib/widgets/common/fade_in_placeholder_image.dart

@@ -1,30 +0,0 @@
-import 'package:flutter/material.dart';
-import 'package:immich_mobile/widgets/common/transparent_image.dart';
-
-class FadeInPlaceholderImage extends StatelessWidget {
-  final Widget placeholder;
-  final ImageProvider image;
-  final Duration duration;
-  final BoxFit fit;
-
-  const FadeInPlaceholderImage({
-    super.key,
-    required this.placeholder,
-    required this.image,
-    this.duration = const Duration(milliseconds: 100),
-    this.fit = BoxFit.cover,
-  });
-
-  @override
-  Widget build(BuildContext context) {
-    return SizedBox.expand(
-      child: Stack(
-        fit: StackFit.expand,
-        children: [
-          placeholder,
-          FadeInImage(fadeInDuration: duration, image: image, fit: fit, placeholder: MemoryImage(kTransparentImage)),
-        ],
-      ),
-    );
-  }
-}

mobile/lib/widgets/common/thumbhash.dart

@@ -1,23 +1,194 @@
+import 'dart:async';
 import 'dart:convert';
+import 'dart:ui' as ui;
+import 'dart:ui';
 
+import 'package:flutter/material.dart';
 import 'package:flutter/widgets.dart';
 import 'package:thumbhash/thumbhash.dart' as thumbhash;
 
-class Thumbhash extends StatelessWidget {
-  final String blurhash;
+class ThumbhashImage extends RenderBox {
+  Color _placeholderColor;
+  ui.Image? _image;
+  BoxFit _fit;
+
+  ThumbhashImage({
+    required ui.Image? image,
+    required BoxFit fit,
+    required Color placeholderColor,
+  })  : _image = image,
+        _fit = fit,
+        _placeholderColor = placeholderColor;
+
+  @override
+  void paint(PaintingContext context, Offset offset) {
+    final image = _image;
+    final rect = offset & size;
+    if (image == null) {
+      final paint = Paint();
+      paint.color = _placeholderColor;
+      context.canvas.drawRect(rect, paint);
+      return;
+    }
+
+    paintImage(
+      canvas: context.canvas,
+      rect: rect,
+      image: image,
+      fit: _fit,
+      filterQuality: FilterQuality.low,
+    );
+  }
+
+  @override
+  void performLayout() {
+    size = constraints.biggest;
+  }
+
+  set image(ui.Image? value) {
+    if (_image != value) {
+      _image = value;
+      markNeedsPaint();
+    }
+  }
+
+  set fit(BoxFit value) {
+    if (_fit != value) {
+      _fit = value;
+      markNeedsPaint();
+    }
+  }
+
+  set placeholderColor(Color value) {
+    if (_placeholderColor != value) {
+      _placeholderColor = value;
+      markNeedsPaint();
+    }
+  }
+}
+
+class ThumbhashLeaf extends LeafRenderObjectWidget {
+  final ui.Image? image;
   final BoxFit fit;
+  final Color placeholderColor;
+
+  const ThumbhashLeaf({
+    super.key,
+    required this.image,
+    required this.fit,
+    required this.placeholderColor,
+  });
+
+  @override
+  RenderObject createRenderObject(BuildContext context) {
+    return ThumbhashImage(
+      image: image,
+      fit: fit,
+      placeholderColor: placeholderColor,
+    );
+  }
+
+  @override
+  void updateRenderObject(BuildContext context, ThumbhashImage renderObject) {
+    renderObject.fit = fit;
+    renderObject.image = image;
+    renderObject.placeholderColor = placeholderColor;
+  }
+}
+
+class Thumbhash extends StatefulWidget {
+  final String? blurhash;
+  final BoxFit fit;
+  final Color placeholderColor;
 
   const Thumbhash({
     required this.blurhash,
     this.fit = BoxFit.cover,
+    this.placeholderColor = const Color.fromRGBO(0, 0, 0, 0.2),
     super.key,
   });
 
+  @override
+  State<Thumbhash> createState() => _ThumbhashState();
+}
+
+class _ThumbhashState extends State<Thumbhash> {
+  String? blurhash;
+  BoxFit? fit;
+  ui.Image? _image;
+  Color? placeholderColor;
+
+  @override
+  void initState() {
+    super.initState();
+    final blurhash_ = blurhash = widget.blurhash;
+    fit = widget.fit;
+    placeholderColor = widget.placeholderColor;
+    if (blurhash_ == null) {
+      return;
+    }
+    final image = thumbhash.thumbHashToRGBA(base64.decode(blurhash_));
+    _decode(image);
+  }
+
+  Future<void> _decode(thumbhash.Image image) async {
+    if (!mounted) {
+      return;
+    }
+    final buffer = await ImmutableBuffer.fromUint8List(image.rgba);
+    if (!mounted) {
+      buffer.dispose();
+      return;
+    }
+
+    final descriptor = ImageDescriptor.raw(
+      buffer,
+      width: image.width,
+      height: image.height,
+      pixelFormat: PixelFormat.rgba8888,
+    );
+    if (!mounted) {
+      buffer.dispose();
+      descriptor.dispose();
+      return;
+    }
+
+    final codec = await descriptor.instantiateCodec(
+      targetWidth: image.width,
+      targetHeight: image.height,
+    );
+    if (!mounted) {
+      buffer.dispose();
+      descriptor.dispose();
+      codec.dispose();
+      return;
+    }
+
+    final frame = (await codec.getNextFrame()).image;
+    buffer.dispose();
+    descriptor.dispose();
+    codec.dispose();
+    if (!mounted) {
+      frame.dispose();
+      return;
+    }
+    setState(() {
+      _image = frame;
+    });
+  }
+
   @override
   Widget build(BuildContext context) {
-    return Image.memory(
-      thumbhash.rgbaToBmp(thumbhash.thumbHashToRGBA(base64.decode(blurhash))),
-      fit: fit,
+    return ThumbhashLeaf(
+      image: _image,
+      fit: fit!,
+      placeholderColor: placeholderColor!,
     );
   }
+
+  @override
+  void dispose() {
+    _image?.dispose();
+    super.dispose();
+  }
 }

mobile/lib/widgets/common/thumbhash_placeholder.dart

@@ -1,29 +1,23 @@
 import 'package:flutter/material.dart';
-import 'package:immich_mobile/widgets/asset_grid/thumbnail_placeholder.dart';
 import 'package:immich_mobile/widgets/common/thumbhash.dart';
 import 'package:octo_image/octo_image.dart';
 
 /// Simple set to show [OctoPlaceholder.circularProgressIndicator] as
 /// placeholder and [OctoError.icon] as error.
-OctoSet blurHashOrPlaceholder(String? blurhash, {BoxFit? fit, Text? errorMessage}) {
+OctoSet blurHashOrPlaceholder(String? blurhash, {BoxFit fit = BoxFit.cover, Text? errorMessage}) {
   return OctoSet(
     placeholderBuilder: blurHashPlaceholderBuilder(blurhash, fit: fit),
     errorBuilder: blurHashErrorBuilder(blurhash, fit: fit, message: errorMessage),
   );
 }
 
-OctoPlaceholderBuilder blurHashPlaceholderBuilder(String? blurhash, {BoxFit? fit}) {
-  return (context) => blurhash == null
-      ? const ThumbnailPlaceholder()
-      : Thumbhash(
-          blurhash: blurhash,
-          fit: fit ?? BoxFit.cover,
-        );
+OctoPlaceholderBuilder blurHashPlaceholderBuilder(String? blurhash, {required BoxFit fit}) {
+  return (context) => Thumbhash(blurhash: blurhash, fit: fit);
 }
 
 OctoErrorBuilder blurHashErrorBuilder(
   String? blurhash, {
-  BoxFit? fit,
+  BoxFit fit = BoxFit.cover,
   Text? message,
   IconData? icon,
   Color? iconColor,