Adaptive Icon Scaling

.gitignore

@@ -1,11 +1,117 @@
-# Files and directories created by pub
-.packages
+# Miscellaneous
+*.class
+*.lock
+*.log
+*.pyc
+*.swp
+.DS_Store
+.atom/
+.buildlog/
+.history
+.svn/
+
+# IntelliJ related
+*.iml
+*.ipr
+*.iws
+.idea/
+
+# Visual Studio Code related
+.classpath
+.project
+.settings/
+.vscode/
+
+# Flutter repo-specific
+/bin/cache/
+/bin/internal/bootstrap.bat
+/bin/internal/bootstrap.sh
+/bin/mingit/
+/dev/benchmarks/mega_gallery/
+/dev/bots/.recipe_deps
+/dev/bots/android_tools/
+/dev/devicelab/ABresults*.json
+/dev/docs/doc/
+/dev/docs/flutter.docs.zip
+/dev/docs/lib/
+/dev/docs/pubspec.yaml
+/dev/integration_tests/**/xcuserdata
+/dev/integration_tests/**/Pods
+/packages/flutter/coverage/
+version
+analysis_benchmark.json
+
+# packages file containing multi-root paths
+.packages.generated
+
+# Flutter/Dart/Pub related
+**/doc/api/
 .dart_tool/
+.flutter-plugins
+.flutter-plugins-dependencies
+**/generated_plugin_registrant.dart
+.packages
+.pub-cache/
 .pub/
-.idea/
 build/
-# Remove the following pattern if you wish to check in your lock file
-pubspec.lock
+flutter_*.png
+linked_*.ds
+unlinked.ds
+unlinked_spec.ds
+
+# Android related
+**/android/**/gradle-wrapper.jar
+**/android/.gradle
+**/android/captures/
+**/android/gradlew
+**/android/gradlew.bat
+**/android/local.properties
+**/android/**/GeneratedPluginRegistrant.java
+**/android/key.properties
+*.jks
+
+# iOS/XCode related
+**/ios/**/*.mode1v3
+**/ios/**/*.mode2v3
+**/ios/**/*.moved-aside
+**/ios/**/*.pbxuser
+**/ios/**/*.perspectivev3
+**/ios/**/*sync/
+**/ios/**/.sconsign.dblite
+**/ios/**/.tags*
+**/ios/**/.vagrant/
+**/ios/**/DerivedData/
+**/ios/**/Icon?
+**/ios/**/Pods/
+**/ios/**/.symlinks/
+**/ios/**/profile
+**/ios/**/xcuserdata
+**/ios/.generated/
+**/ios/Flutter/.last_build_id
+**/ios/Flutter/App.framework
+**/ios/Flutter/Flutter.framework
+**/ios/Flutter/Flutter.podspec
+**/ios/Flutter/Generated.xcconfig
+**/ios/Flutter/app.flx
+**/ios/Flutter/app.zip
+**/ios/Flutter/flutter_assets/
+**/ios/Flutter/flutter_export_environment.sh
+**/ios/ServiceDefinitions.json
+**/ios/Runner/GeneratedPluginRegistrant.*
+
+# macOS
+**/macos/Flutter/GeneratedPluginRegistrant.swift
+
+# Coverage
+coverage/
+
+# Symbols
+app.*.symbols
 
-# Directory created by dartdoc
-doc/api/
+# Exceptions to above rules.
+!**/ios/**/default.mode1v3
+!**/ios/**/default.mode2v3
+!**/ios/**/default.pbxuser
+!**/ios/**/default.perspectivev3
+!/packages/flutter_tools/test/data/dart_dependencies_test/**/.packages
+!/dev/ci/**/Gemfile.lock

example/android/local.properties

@@ -0,0 +1,3 @@
+sdk.dir=C:\\Users\\yanco\\AppData\\Local\\Android\\Sdk
+flutter.sdk=C:\\flutter
+flutter.buildMode=debug

example/default_example/pubspec.yaml

@@ -21,6 +21,7 @@ flutter_icons:
   ios: true # can specify file name here e.g. "My-Launcher-Icon"
   adaptive_icon_background: "assets/images/christmas-background.png" # only available for Android 8.0 devices and above
   adaptive_icon_foreground: "assets/images/icon-foreground-432x432.png" # only available for Android 8.0 devices and above
+  adaptive_icon_foreground_scale_factor: 1.0 # Test adaptive icon scaling
 
 dev_dependencies:
   flutter_test:

lib/android.dart

@@ -1,9 +1,11 @@
 import 'dart:io';
+import 'dart:math';
+
+import 'package:flutter_launcher_icons/constants.dart' as constants;
+import 'package:flutter_launcher_icons/custom_exceptions.dart';
 import 'package:flutter_launcher_icons/utils.dart';
 import 'package:flutter_launcher_icons/xml_templates.dart' as xml_template;
 import 'package:image/image.dart';
-import 'package:flutter_launcher_icons/custom_exceptions.dart';
-import 'package:flutter_launcher_icons/constants.dart' as constants;
 
 class AndroidIconTemplate {
   AndroidIconTemplate({required this.size, required this.directoryName});
@@ -68,24 +70,71 @@ bool isAndroidIconNameCorrectFormat(String iconName) {
   return true;
 }
 
+/// Rescales image by creating a different sized canvas and copying image centered onto the new canvas
+Image rescaleImage(Image image, double scaleFactor, {int fillColor = 0}) {
+  printStatus('Rescaling icon by $scaleFactor');
+  final int scaledDimension =
+      (max(image.width, image.height) * 1 / scaleFactor).floor();
+  if (image.width != image.height) {
+    printStatus(
+        'Foreground image is not square!  Scaled canvas will be made square '
+        'to meet Adaptive Icon Specifications');
+  }
+  final Image scaledImage = Image(scaledDimension, scaledDimension);
+  scaledImage.fill(fillColor);
+  copyInto(
+    scaledImage,
+    image,
+    dstX: ((scaledDimension - image.width) / 2).floor(),
+    dstY: ((scaledDimension - image.height) / 2).floor(),
+  );
+  return scaledImage;
+}
+
 void createAdaptiveIcons(
     Map<String, dynamic> flutterLauncherIconsConfig, String? flavor) {
   printStatus('Creating adaptive icons Android');
 
-  // Retrieve the necessary Flutter Launcher Icons configuration from the pubspec.yaml file
+  // Retrieve the necessary Flutter Launcher Icons configuration from the yaml file
   final String backgroundConfig =
       flutterLauncherIconsConfig['adaptive_icon_background'];
   final String foregroundImagePath =
       flutterLauncherIconsConfig['adaptive_icon_foreground'];
-  final Image? foregroundImage = decodeImageFile(foregroundImagePath);
-  if (foregroundImage == null) {
-    return;
-  }
+  final Image? foregroundImage =
+      decodeImage(File(foregroundImagePath).readAsBytesSync());
+  final double? foregroundScaleFactor =
+      flutterLauncherIconsConfig['adaptive_icon_foreground_scale_factor'];
+  final String? foregroundScaleFillColor =
+      flutterLauncherIconsConfig['adaptive_icon_foreground_scale_fill_color'];
 
-  // Create adaptive icon foreground images
-  for (AndroidIconTemplate androidIcon in adaptiveForegroundIcons) {
-    overwriteExistingIcons(androidIcon, foregroundImage,
-        constants.androidAdaptiveForegroundFileName, flavor);
+  final bool rescale = foregroundScaleFactor != null &&
+      foregroundScaleFactor > 0 &&
+      foregroundImage != null;
+
+  // Scales the foreground image prior to converting to icon.  This is mainly for scaling down to match adaptive icon spec
+  if (rescale) {
+    Image rescaledImage;
+
+    int _getColorFromHex(String hexColor) {
+      //Converts hex string to int
+      hexColor = hexColor.toUpperCase().replaceAll('#', '');
+      return int.parse(hexColor, radix: 16);
+    }
+
+    rescaledImage = rescaleImage(foregroundImage, foregroundScaleFactor,
+        fillColor: foregroundScaleFillColor != null &&
+                foregroundScaleFillColor.isNotEmpty
+            ? _getColorFromHex(foregroundScaleFillColor)
+            : 0);
+
+    // Create adaptive icon foreground images
+    for (AndroidIconTemplate androidIcon in adaptiveForegroundIcons) {
+      overwriteExistingIcons(
+          androidIcon,
+          rescale ? rescaledImage : foregroundImage,
+          constants.androidAdaptiveForegroundFileName,
+          flavor);
+    }
   }
 
   // Create adaptive icon background

lib/ios.dart

@@ -1,8 +1,9 @@
 import 'dart:convert';
 import 'dart:io';
+
+import 'package:flutter_launcher_icons/constants.dart';
 import 'package:flutter_launcher_icons/utils.dart';
 import 'package:image/image.dart';
-import 'package:flutter_launcher_icons/constants.dart';
 
 /// File to handle the creation of icons for iOS platform
 class IosIconTemplate {

lib/main.dart

@@ -1,12 +1,12 @@
 import 'dart:io';
 
 import 'package:args/args.dart';
-import 'package:path/path.dart' as path;
-import 'package:yaml/yaml.dart';
 import 'package:flutter_launcher_icons/android.dart' as android_launcher_icons;
-import 'package:flutter_launcher_icons/ios.dart' as ios_launcher_icons;
 import 'package:flutter_launcher_icons/constants.dart';
 import 'package:flutter_launcher_icons/custom_exceptions.dart';
+import 'package:flutter_launcher_icons/ios.dart' as ios_launcher_icons;
+import 'package:path/path.dart' as path;
+import 'package:yaml/yaml.dart';
 
 const String fileOption = 'file';
 const String helpFlag = 'help';