force resolution 1.0

This PR improves some fill performance issues I found with various Lottie animations.
I think the real issue comes down to the render performance of Path.addPath(). The performance issue happens in the Render thread and seems directly related to how large the animation is on-screen. Flutter might be caching pre-rendered textures and running out of memory.

I've changed how Path.addPath() is called and how the path is rendered for fill_content.dart and gradient_fill_content.dart.

Just as an example, the example/assets/Tests/bm.json animation gets ~60 fps with this fix, compared to 34-52 fps with the lottie-flutter 0.6.0 release. (This is on a Pixel 3 XL)

There are a couple of other changes:

- I fixed a bug with the casing of "weather" in pubspec.yaml. Without this fix, the examples don't build on Ubuntu Linux.
The debugging class MeanCalculator wasn't initializing its fields, causing a null pointer exception when debugging.
- I added antiAliasingSuggested to LottieDrawable to allow fill paints to be anti-aliased. It is off by default. It also provides some minor performance improvements without any noticeable loss in quality. It is only applied to fills right now.
- I added PathFactory to create Paths rather than just new-ing them. path_factory.dart allows you to switch out the normal Path creation with a debug logging implementation so you can see all of the Path calls that are performed during a frame. Just create a DebugPath in the factory rather than Path.

.github/workflows/analyze.yaml

@@ -10,8 +10,8 @@ jobs:
     name: Flutter analyze
     strategy:
       matrix:
-        flutter: ['stable', 'dev']
+        flutter: ['stable']
-    runs-on: macos-latest
+    runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v2
       - uses: subosito/flutter-action@v1
@@ -22,9 +22,6 @@ jobs:
       - run: flutter pub get
         working-directory: example
       - run: flutter analyze
-      - run: flutter test test # https://github.com/flutter/flutter/issues/20907
-      - run: flutter test test
-        working-directory: example
       - run: flutter pub run tool/prepare_submit.dart
       - name: "check for uncommitted changes"
         run: |

.github/workflows/test.yaml

@@ -0,0 +1,17 @@
+name: Lottie Flutter
+on:
+  pull_request:
+  push:
+    branches:
+      - master
+
+jobs:
+  test:
+    name: Run all tests
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - name: Run tests
+        uses: docker://cirrusci/flutter:1.22.1
+        with:
+          args: sh run_tests.sh

CHANGELOG.md

@@ -1,3 +1,9 @@
+## [0.7.0+1]
+- Fix Flutter Web compilation error
+
+## [0.7.0]
+- Performance improvement for complex animations.
+
 ## [0.6.0]
 - Runs the animation at the frame rate specified in the json file (ie. An animation encoded with a 20 FPS will only
   be paint 20 times per seconds even though the AnimationController will invalidate the widget 60 times per seconds).  

CONTRIBUTING.md

@@ -0,0 +1,7 @@
+
+## Run the Golden tests
+Run and update the golden tests requires Docker installed.
+
+```shell script
+sh update_goldens.sh
+```

README.md

@@ -8,7 +8,7 @@ animations exported as json with [Bodymovin](https://github.com/airbnb/lottie-we
 
 This repository is a unofficial conversion of the [Lottie-android](https://github.com/airbnb/lottie-android) library in pure Dart. 
 
-It works on Android, iOS and macOS and web.
+It works on Android, iOS, macOS, linux, windows and web.
 
 ## Usage
 

README.template.md

@@ -8,7 +8,7 @@ animations exported as json with [Bodymovin](https://github.com/airbnb/lottie-we
 
 This repository is a unofficial conversion of the [Lottie-android](https://github.com/airbnb/lottie-android) library in pure Dart. 
 
-It works on Android, iOS and macOS and web.
+It works on Android, iOS, macOS, linux, windows and web.
 
 ## Usage
 

example/pubspec.lock

@@ -7,56 +7,56 @@ packages:
       name: archive
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.0.13"
+    version: "2.0.11"
   args:
     dependency: transitive
     description:
       name: args
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.6.0"
+    version: "1.5.2"
   async:
     dependency: transitive
     description:
       name: async
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.4.2"
+    version: "2.5.0-nullsafety.1"
   boolean_selector:
     dependency: transitive
     description:
       name: boolean_selector
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.0.0"
+    version: "2.1.0-nullsafety.1"
   characters:
     dependency: transitive
     description:
       name: characters
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.1.0-nullsafety"
+    version: "1.1.0-nullsafety.3"
   charcode:
     dependency: transitive
     description:
       name: charcode
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.1.3"
+    version: "1.2.0-nullsafety.1"
   clock:
     dependency: transitive
     description:
       name: clock
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.0.1"
+    version: "1.1.0-nullsafety.1"
   collection:
     dependency: transitive
     description:
       name: collection
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.15.0-nullsafety"
+    version: "1.15.0-nullsafety.3"
   convert:
     dependency: transitive
     description:
@@ -70,14 +70,21 @@ packages:
       name: crypto
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.1.5"
+    version: "2.1.3"
   fake_async:
     dependency: transitive
     description:
       name: fake_async
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.1.0"
+    version: "1.2.0-nullsafety.1"
+  ffi:
+    dependency: transitive
+    description:
+      name: ffi
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "0.1.3"
   file:
     dependency: transitive
     description:
@@ -143,35 +150,35 @@ packages:
       path: ".."
       relative: true
     source: path
-    version: "0.6.0"
+    version: "0.7.0+1"
   matcher:
     dependency: transitive
     description:
       name: matcher
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.12.8"
+    version: "0.12.10-nullsafety.1"
   meta:
     dependency: transitive
     description:
       name: meta
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.3.0-nullsafety"
+    version: "1.3.0-nullsafety.3"
   path:
     dependency: transitive
     description:
       name: path
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.7.0"
+    version: "1.8.0-nullsafety.1"
   path_provider:
     dependency: "direct main"
     description:
       name: path_provider
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.6.11"
+    version: "1.6.21"
   path_provider_linux:
     dependency: transitive
     description:
@@ -185,21 +192,28 @@ packages:
       name: path_provider_macos
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.0.4+3"
+    version: "0.0.4+4"
   path_provider_platform_interface:
     dependency: transitive
     description:
       name: path_provider_platform_interface
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.0.2"
+    version: "1.0.3"
+  path_provider_windows:
+    dependency: transitive
+    description:
+      name: path_provider_windows
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "0.0.4+1"
   pedantic:
     dependency: transitive
     description:
       name: pedantic
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.9.2"
+    version: "1.8.0+1"
   platform:
     dependency: transitive
     description:
@@ -213,7 +227,7 @@ packages:
       name: plugin_platform_interface
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.0.2"
+    version: "1.0.3"
   process:
     dependency: transitive
     description:
@@ -232,56 +246,63 @@ packages:
       name: source_span
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.7.0"
+    version: "1.8.0-nullsafety.2"
   stack_trace:
     dependency: transitive
     description:
       name: stack_trace
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.9.5"
+    version: "1.10.0-nullsafety.1"
   stream_channel:
     dependency: transitive
     description:
       name: stream_channel
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.0.0"
+    version: "2.1.0-nullsafety.1"
   string_scanner:
     dependency: transitive
     description:
       name: string_scanner
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.0.5"
+    version: "1.1.0-nullsafety.1"
   term_glyph:
     dependency: transitive
     description:
       name: term_glyph
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.1.0"
+    version: "1.2.0-nullsafety.1"
   test_api:
     dependency: transitive
     description:
       name: test_api
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.2.17"
+    version: "0.2.19-nullsafety.2"
   typed_data:
     dependency: transitive
     description:
       name: typed_data
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.3.0-nullsafety"
+    version: "1.3.0-nullsafety.3"
   vector_math:
     dependency: transitive
     description:
       name: vector_math
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.1.0-nullsafety"
+    version: "2.1.0-nullsafety.3"
+  win32:
+    dependency: transitive
+    description:
+      name: win32
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "1.7.3"
   xdg_directories:
     dependency: transitive
     description:
@@ -290,5 +311,5 @@ packages:
     source: hosted
     version: "0.1.0"
 sdks:
-  dart: ">=2.9.0-18.0 <2.9.0"
+  dart: ">=2.10.0-110 <2.11.0"
   flutter: ">=1.12.13+hotfix.5 <2.0.0"

example/pubspec.yaml

@@ -8,11 +8,11 @@ environment:
 dependencies:
   flutter:
     sdk: flutter
+  flutter_colorpicker:
+  http:
   lottie:
     path: ../
-  flutter_colorpicker:
   path_provider:
-  http:
 
 dev_dependencies:
   flutter_test:
@@ -34,7 +34,7 @@ flutter:
     - assets/Logo/
     - assets/Images/
     - assets/Images/WeAccept/
-    - assets/Weather/
+    - assets/weather/
     - assets/example_with_images/
     - assets/example_with_images/images/
 

example/test/dynamic_properties_test.dart

@@ -22,6 +22,9 @@ void main() {
         .replaceAll(' ', '_');
 
     testWidgets(description, (tester) async {
+      tester.binding.window.physicalSizeTestValue = Size(500, 400);
+      tester.binding.window.devicePixelRatioTestValue = 1.0;
+
       var animation =
           AnimationController(vsync: tester, duration: composition.duration);
       if (progress != null) {

example/test/dynamic_text_test.dart

@@ -6,6 +6,9 @@ import 'package:lottie/lottie.dart';
 
 void main() {
   testWidgets('Dynamic test', (tester) async {
+    tester.binding.window.physicalSizeTestValue = Size(500, 400);
+    tester.binding.window.devicePixelRatioTestValue = 1.0;
+
     var composition = await LottieComposition.fromBytes(
         File('assets/Tests/DynamicText.json').readAsBytesSync());