memory optimization

mobile/lib/infrastructure/loaders/image_request.dart

@@ -34,7 +34,7 @@ abstract class ImageRequest {
 
   void _onCancelled();
 
-  Future<ui.FrameInfo?> _fromPlatformImage(Map<String, int> info) async {
+  Future<ui.FrameInfo?> _fromPlatformImage(Map<String, int> info, ui.PixelFormat pixelFormat, bool shouldFree) async {
     final address = info['pointer'];
     if (address == null) {
       return null;
@@ -42,7 +42,9 @@ abstract class ImageRequest {
 
     final pointer = Pointer<Uint8>.fromAddress(address);
     if (_isCancelled) {
-      malloc.free(pointer);
+      if (shouldFree) {
+        malloc.free(pointer);
+      }
       return null;
     }
 
@@ -58,7 +60,9 @@ abstract class ImageRequest {
       actualSize = rowBytes * actualHeight;
       buffer = await ImmutableBuffer.fromUint8List(pointer.asTypedList(actualSize));
     } finally {
-      malloc.free(pointer);
+      if (shouldFree) {
+        malloc.free(pointer);
+      }
     }
 
     if (_isCancelled) {
@@ -71,7 +75,7 @@ abstract class ImageRequest {
       width: actualWidth,
       height: actualHeight,
       rowBytes: rowBytes,
-      pixelFormat: ui.PixelFormat.rgba8888,
+      pixelFormat: pixelFormat,
     );
     final codec = await descriptor.instantiateCodec();
     if (_isCancelled) {

mobile/lib/infrastructure/loaders/local_image_request.dart

@@ -24,7 +24,7 @@ class LocalImageRequest extends ImageRequest {
       isVideo: assetType == AssetType.video,
     );
 
-    final frame = await _fromPlatformImage(info);
+    final frame = await _fromPlatformImage(info, ui.PixelFormat.rgba8888, true);
     return frame == null ? null : ImageInfo(image: frame.image, scale: scale);
   }
 

mobile/lib/infrastructure/loaders/remote_image_request.dart

@@ -14,12 +14,16 @@ class RemoteImageRequest extends ImageRequest {
 
     final Map<String, int> info = await remoteImageApi.requestImage(uri, headers: headers, requestId: requestId);
 
-    final frame = await _fromPlatformImage(info);
-    return frame == null ? null : ImageInfo(image: frame.image, scale: scale);
+    try {
+      final frame = await _fromPlatformImage(info, ui.PixelFormat.bgra8888, false);
+      return frame == null ? null : ImageInfo(image: frame.image, scale: scale);
+    } finally {
+      unawaited(remoteImageApi.releaseImage(requestId));
+    }
   }
 
   @override
   Future<void> _onCancelled() {
-    return localImageApi.cancelRequest(requestId);
+    return remoteImageApi.cancelRequest(requestId);
   }
 }

mobile/lib/infrastructure/loaders/thumbhash_image_request.dart

@@ -12,7 +12,7 @@ class ThumbhashImageRequest extends ImageRequest {
     }
 
     final Map<String, int> info = await localImageApi.getThumbhash(thumbhash);
-    final frame = await _fromPlatformImage(info);
+    final frame = await _fromPlatformImage(info, ui.PixelFormat.rgba8888, true);
     return frame == null ? null : ImageInfo(image: frame.image, scale: scale);
   }