[vector_graphics] Fix memory leaks and activate leak testing [prod-leak-fix] (flutter#8373)

The package manipulates disposable objects. This PR
- Fixes some memory leaks.
- Activates leak testing to make sure disposable objects are correctly disposed.

See the documentation: https://github.com/dart-lang/leak_tracker/blob/main/doc%2Fleak_tracking%2FDETECT.md

Author: ValentinVignal

packages/vector_graphics/CHANGELOG.md

@@ -1,3 +1,7 @@
+## 1.1.16
+
+* Fixes some memory leaks by disposing undisposed `ImageInfo`, `ui.Picture` and `Picture`.
+
 ## 1.1.15
 
 * Updates error handling in VectorGraphicWidget to handle errors when the bytes of the graphic cannot be loaded.

packages/vector_graphics/lib/src/listener.dart

@@ -252,7 +252,7 @@ class FlutterVectorGraphicsListener extends VectorGraphicsCodecListener {
   final List<_TextConfig> _textConfig = <_TextConfig>[];
   final List<_TextPosition> _textPositions = <_TextPosition>[];
   final List<Future<void>> _pendingImages = <Future<void>>[];
-  final Map<int, Image> _images = <int, Image>{};
+  final Map<int, ImageInfo> _images = <int, ImageInfo>{};
   final Map<int, _PatternState> _patterns = <int, _PatternState>{};
   Path? _currentPath;
   Size _size = Size.zero;
@@ -283,7 +283,7 @@ class FlutterVectorGraphicsListener extends VectorGraphicsCodecListener {
     try {
       return PictureInfo._(_recorder.endRecording(), _size);
     } finally {
-      for (final Image image in _images.values) {
+      for (final ImageInfo image in _images.values) {
         image.dispose();
       }
       _images.clear();
@@ -746,7 +746,7 @@ class FlutterVectorGraphicsListener extends VectorGraphicsCodecListener {
     listener = ImageStreamListener(
       (ImageInfo image, bool synchronousCall) {
         cacheCompleter.removeListener(listener);
-        _images[imageId] = image.image;
+        _images[imageId] = image;
         completer.complete();
       },
       onError: (Object exception, StackTrace? stackTrace) {
@@ -773,7 +773,7 @@ class FlutterVectorGraphicsListener extends VectorGraphicsCodecListener {
   @override
   void onDrawImage(int imageId, double x, double y, double width, double height,
       Float64List? transform) {
-    final Image image = _images[imageId]!;
+    final Image image = _images[imageId]!.image;
     if (transform != null) {
       _canvas.save();
       _canvas.transform(transform);

packages/vector_graphics/lib/src/render_vector_graphic.dart

@@ -213,6 +213,7 @@ class RenderVectorGraphic extends RenderBox {
 
     final ui.Image pending =
         rasterPicture.toImageSync(scaledWidth, scaledHeight);
+    rasterPicture.dispose();
     return RasterData(pending, 0, key);
   }
 

packages/vector_graphics/lib/src/vector_graphics.dart

@@ -340,8 +340,10 @@ class _VectorGraphicWidgetState extends State<VectorGraphic> {
       return;
     }
     data.count -= 1;
-    if (data.count == 0 && _livePictureCache.containsKey(data.key)) {
-      _livePictureCache.remove(data.key);
+    if (data.count == 0) {
+      if (_livePictureCache.containsKey(data.key)) {
+        _livePictureCache.remove(data.key);
+      }
       data.pictureInfo.picture.dispose();
     }
   }
@@ -382,7 +384,7 @@ class _VectorGraphicWidgetState extends State<VectorGraphic> {
   }
 
   Future<void> _loadAssetBytes() async {
-    // First check if we have an avilable picture and use this immediately.
+    // First check if we have an available picture and use this immediately.
     final Object loaderKey = widget.loader.cacheKey(context);
     final _PictureKey key =
         _PictureKey(loaderKey, locale, textDirection, widget.clipViewbox);

packages/vector_graphics/pubspec.yaml

@@ -2,7 +2,7 @@ name: vector_graphics
 description: A vector graphics rendering package for Flutter using a binary encoding.
 repository: https://github.com/flutter/packages/tree/main/packages/vector_graphics
 issue_tracker: https://github.com/flutter/flutter/issues?q=is%3Aissue+is%3Aopen+label%3A%22p%3A+vector_graphics%22
-version: 1.1.15
+version: 1.1.16
 
 environment:
   sdk: ^3.4.0
@@ -17,6 +17,7 @@ dependencies:
 dev_dependencies:
   flutter_test:
     sdk: flutter
+  leak_tracker_flutter_testing: any
   vector_graphics_compiler: ^1.1.11+1
 
 platforms:

packages/vector_graphics/test/flutter_test_config.dart

@@ -0,0 +1,13 @@
+// Copyright 2013 The Flutter Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import 'dart:async';
+
+import 'package:leak_tracker_flutter_testing/leak_tracker_flutter_testing.dart';
+
+Future<void> testExecutable(FutureOr<void> Function() testMain) async {
+  LeakTesting.enable();
+  LeakTracking.warnForUnsupportedPlatforms = false;
+  await testMain();
+}

packages/vector_graphics/test/vector_graphics_test.dart

@@ -442,7 +442,9 @@ void main() {
     );
     await tester.pumpAndSettle();
 
-    expect(await completer.future, isA<PictureInfo>());
+    final PictureInfo picture = await completer.future;
+    addTearDown(picture.picture.dispose);
+    expect(picture, isA<PictureInfo>());
     expect(debugLastLocale, const Locale('fr', 'CH'));
     expect(debugLastTextDirection, TextDirection.rtl);
   });
@@ -475,7 +477,9 @@ void main() {
     );
     await tester.pumpAndSettle();
 
-    expect(await completer.future, isA<PictureInfo>());
+    final PictureInfo picture = await completer.future;
+    addTearDown(picture.picture.dispose);
+    expect(picture, isA<PictureInfo>());
     expect(debugLastLocale, PlatformDispatcher.instance.locale);
     expect(debugLastTextDirection, TextDirection.ltr);
   });
@@ -584,7 +588,7 @@ void main() {
     expect(imageCache.statusForKey(imageKey).live, false);
     expect(imageCache.statusForKey(imageKey).keepAlive, true);
 
-    // A blue square, becuase the image is available now.
+    // A blue square, because the image is available now.
     await expectLater(
       find.byKey(key),
       matchesGoldenFile('vg_with_image_blue.png'),