Add remaining dart fixes for Color deprecations when importing painting.dart (#162609)

Towards https://github.com/flutter/flutter/issues/160617

Noticed the `opacity` and `withOpacity` deprecations were supported by
dart fix, but not the others. Adding them here.

But strange too given `dart:ui` does not support dart fix
(https://github.com/dart-lang/sdk/issues/59764)..

---

We think since `painting.dart` exports `dart:ui`, this is somewhat of a
workaround.

If a user has this atop their file:

```dart
import 'package:flutter/painting.dart'; // 👍  dart fix will work here
```
 If instead

```dart
import 'dart:ui'; // ❌  dart fix will not work here
```

Will continue to follow up on dart fix support for `dart:X` libraries,
for now hopefully this will help!

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above.
- [x] I updated/added relevant documentation (doc comments with `///`).
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[test-exempt].
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Fixes] where supported.
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engine/src/flutter/lib/ui/painting.dart

@@ -263,7 +263,7 @@ class Color {
   ///
   /// A value of 0 means this color is fully transparent. A value of 255 means
   /// this color is fully opaque.
-  @Deprecated('Use .a.')
+  @Deprecated('Use (*.a * 255.0).round() & 0xff')
   int get alpha => (0xff000000 & value) >> 24;
 
   /// The alpha channel of this color as a double.
@@ -274,15 +274,15 @@ class Color {
   double get opacity => alpha / 0xFF;
 
   /// The red channel of this color in an 8 bit value.
-  @Deprecated('Use .r.')
+  @Deprecated('Use (*.r * 255.0).round() & 0xff')
   int get red => (0x00ff0000 & value) >> 16;
 
   /// The green channel of this color in an 8 bit value.
-  @Deprecated('Use .g.')
+  @Deprecated('Use (*.g * 255.0).round() & 0xff')
   int get green => (0x0000ff00 & value) >> 8;
 
   /// The blue channel of this color in an 8 bit value.
-  @Deprecated('Use .b.')
+  @Deprecated('Use (*.b * 255.0).round() & 0xff')
   int get blue => (0x000000ff & value) >> 0;
 
   /// Returns a new color with the provided components updated.

packages/flutter/lib/fix_data/fix_painting.yaml

@@ -127,6 +127,19 @@ transforms:
       - kind: 'rename'
         newName: 'a'
 
+  - title: "Replace 'value' with 'toARGB32()'"
+    date: 2025-02-03
+    element:
+      uris: [ 'painting.dart' ]
+      method: 'value'
+      inClass: 'Color'
+    changes:
+      - kind: 'replacedBy'
+        newElement:
+          uris: [ 'painting.dart' ]
+          method: 'toARGB32'
+          inClass: 'Color'
+
   - title: "Rename 'withOpacity'"
     date: 2024-09-10
     element:

packages/flutter/test_fixes/painting/painting.dart

@@ -22,5 +22,6 @@ void main() {
 
   Color color = Color.from(alpha: 1, red: 0, green: 1, blue: 0);
   print(color.opacity);
+  print(color.value);
   color = color.withOpacity(0.55);
 }

packages/flutter/test_fixes/painting/painting.dart.expect

@@ -21,5 +21,6 @@ void main() {
 
   Color color = Color.from(alpha: 1, red: 0, green: 1, blue: 0);
   print(color.a);
+  print(color.toARGB32());
   color = color.withValues(alpha: 0.55);
 }