avoid forceToPoint in hit-testing when possible (#57519)

packages/flutter/lib/src/cupertino/segmented_control.dart

@@ -718,13 +718,12 @@ class _RenderSegmentedControl<T> extends RenderBox
     while (child != null) {
       final _SegmentedControlContainerBoxParentData childParentData = child.parentData as _SegmentedControlContainerBoxParentData;
       if (childParentData.surroundingRect.contains(position)) {
-        final Offset center = (Offset.zero & child.size).center;
-        return result.addWithRawTransform(
-          transform: MatrixUtils.forceToPoint(center),
-          position: center,
-          hitTest: (BoxHitTestResult result, Offset position) {
-            assert(position == center);
-            return child.hitTest(result, position: center);
+        return result.addWithPaintOffset(
+          offset: childParentData.offset,
+          position: position,
+          hitTest: (BoxHitTestResult result, Offset localOffset) {
+            assert(localOffset == position - childParentData.offset);
+            return child.hitTest(result, position: localOffset);
           },
         );
       }

packages/flutter/lib/src/cupertino/sliding_segmented_control.dart

@@ -1025,13 +1025,12 @@ class _RenderSegmentedControl<T> extends RenderBox
       final _SegmentedControlContainerBoxParentData childParentData =
         child.parentData as _SegmentedControlContainerBoxParentData;
       if ((childParentData.offset & child.size).contains(position)) {
-        final Offset center = (Offset.zero & child.size).center;
-        return result.addWithRawTransform(
-          transform: MatrixUtils.forceToPoint(center),
-          position: center,
-          hitTest: (BoxHitTestResult result, Offset position) {
-            assert(position == center);
-            return child.hitTest(result, position: center);
+        return result.addWithPaintOffset(
+          offset: childParentData.offset,
+          position: position,
+          hitTest: (BoxHitTestResult result, Offset localOffset) {
+            assert(localOffset == position - childParentData.offset);
+            return child.hitTest(result, position: localOffset);
           },
         );
       }

packages/flutter/test/cupertino/segmented_control_test.dart

@@ -926,6 +926,46 @@ void main() {
     expect(sharedValue, 0);
   });
 
+  testWidgets('Hit-tests report accurate local position in segments', (WidgetTester tester) async {
+    final Map<int, Widget> children = <int, Widget>{};
+    TapDownDetails tapDownDetails;
+    children[0] = GestureDetector(
+      behavior: HitTestBehavior.opaque,
+      onTapDown: (TapDownDetails details) { tapDownDetails = details; },
+      child: const SizedBox(width: 200, height: 200),
+    );
+    children[1] = const Text('Child 2');
+
+    int sharedValue = 1;
+
+    await tester.pumpWidget(
+      StatefulBuilder(
+        builder: (BuildContext context, StateSetter setState) {
+          return boilerplate(
+            child: CupertinoSegmentedControl<int>(
+              key: const ValueKey<String>('Segmented Control'),
+              children: children,
+              onValueChanged: (int newValue) {
+                setState(() {
+                  sharedValue = newValue;
+                });
+              },
+              groupValue: sharedValue,
+            ),
+          );
+        },
+      ),
+    );
+
+    expect(sharedValue, 1);
+
+    final Offset segment0GlobalOffset = tester.getTopLeft(find.byWidget(children[0]));
+    await tester.tapAt(segment0GlobalOffset + const Offset(7, 11));
+
+    expect(tapDownDetails.localPosition, const Offset(7, 11));
+    expect(tapDownDetails.globalPosition, segment0GlobalOffset + const Offset(7, 11));
+  });
+
   testWidgets(
     'Segment still hittable with a child that has no hitbox',
     (WidgetTester tester) async {

packages/flutter/test/cupertino/sliding_segmented_control_test.dart

@@ -783,6 +783,38 @@ void main() {
     expect(groupValue, 1);
   });
 
+  testWidgets('Hit-tests report accurate local position in segments', (WidgetTester tester) async {
+    final Map<int, Widget> children = <int, Widget>{};
+    TapDownDetails tapDownDetails;
+    children[0] = GestureDetector(
+      behavior: HitTestBehavior.opaque,
+      onTapDown: (TapDownDetails details) { tapDownDetails = details; },
+      child: const SizedBox(width: 200, height: 200),
+    );
+    children[1] = const Text('Child 2');
+
+    await tester.pumpWidget(
+      boilerplate(
+        builder: (BuildContext context) {
+          return CupertinoSlidingSegmentedControl<int>(
+            key: const ValueKey<String>('Segmented Control'),
+            children: children,
+            groupValue: groupValue,
+            onValueChanged: defaultCallback,
+          );
+        },
+      ),
+    );
+
+    expect(groupValue, 0);
+
+    final Offset segment0GlobalOffset = tester.getTopLeft(find.byWidget(children[0]));
+    await tester.tapAt(segment0GlobalOffset + const Offset(7, 11));
+
+    expect(tapDownDetails.localPosition, const Offset(7, 11));
+    expect(tapDownDetails.globalPosition, segment0GlobalOffset + const Offset(7, 11));
+  });
+
   testWidgets('Thumb animation is correct when the selected segment changes', (WidgetTester tester) async {
     await tester.pumpWidget(setupSimpleSegmentedControl());