Remove unused offset from Layer.addToScene/addChildrenToScene (#91753)

packages/flutter/lib/src/rendering/layer.dart

@@ -527,7 +527,7 @@ abstract class Layer extends AbstractNode with DiagnosticableTreeMixin {
   /// Return the engine layer for retained rendering. When there's no
   /// corresponding engine layer, null is returned.
   @protected
-  void addToScene(ui.SceneBuilder builder, [ Offset layerOffset = Offset.zero ]);
+  void addToScene(ui.SceneBuilder builder);
 
   void _addToSceneWithRetainedRendering(ui.SceneBuilder builder) {
     // There can't be a loop by adding a retained layer subtree whose
@@ -709,9 +709,9 @@ class PictureLayer extends Layer {
   }
 
   @override
-  void addToScene(ui.SceneBuilder builder, [ Offset layerOffset = Offset.zero ]) {
+  void addToScene(ui.SceneBuilder builder) {
     assert(picture != null);
-    builder.addPicture(layerOffset, picture!, isComplexHint: isComplexHint, willChangeHint: willChangeHint);
+    builder.addPicture(Offset.zero, picture!, isComplexHint: isComplexHint, willChangeHint: willChangeHint);
   }
 
   @override
@@ -788,13 +788,12 @@ class TextureLayer extends Layer {
   final ui.FilterQuality filterQuality;
 
   @override
-  void addToScene(ui.SceneBuilder builder, [ Offset layerOffset = Offset.zero ]) {
-    final Rect shiftedRect = layerOffset == Offset.zero ? rect : rect.shift(layerOffset);
+  void addToScene(ui.SceneBuilder builder) {
     builder.addTexture(
       textureId,
-      offset: shiftedRect.topLeft,
-      width: shiftedRect.width,
-      height: shiftedRect.height,
+      offset: rect.topLeft,
+      width: rect.width,
+      height: rect.height,
       freeze: freeze,
       filterQuality: filterQuality,
     );
@@ -827,13 +826,12 @@ class PlatformViewLayer extends Layer {
   final int viewId;
 
   @override
-  void addToScene(ui.SceneBuilder builder, [ Offset layerOffset = Offset.zero ]) {
-    final Rect shiftedRect = layerOffset == Offset.zero ? rect : rect.shift(layerOffset);
+  void addToScene(ui.SceneBuilder builder) {
     builder.addPlatformView(
       viewId,
-      offset: shiftedRect.topLeft,
-      width: shiftedRect.width,
-      height: shiftedRect.height,
+      offset: rect.topLeft,
+      width: rect.width,
+      height: rect.height,
     );
   }
 }
@@ -898,10 +896,9 @@ class PerformanceOverlayLayer extends Layer {
   final bool checkerboardOffscreenLayers;
 
   @override
-  void addToScene(ui.SceneBuilder builder, [ Offset layerOffset = Offset.zero ]) {
+  void addToScene(ui.SceneBuilder builder) {
     assert(optionsMask != null);
-    final Rect shiftedOverlayRect = layerOffset == Offset.zero ? overlayRect : overlayRect.shift(layerOffset);
-    builder.addPerformanceOverlay(optionsMask, shiftedOverlayRect);
+    builder.addPerformanceOverlay(optionsMask, overlayRect);
     builder.setRasterizerTracingThreshold(rasterizerThreshold);
     builder.setCheckerboardRasterCacheImages(checkerboardRasterCacheImages);
     builder.setCheckerboardOffscreenLayers(checkerboardOffscreenLayers);
@@ -1092,8 +1089,8 @@ class ContainerLayer extends Layer {
   }
 
   @override
-  void addToScene(ui.SceneBuilder builder, [ Offset layerOffset = Offset.zero ]) {
-    addChildrenToScene(builder, layerOffset);
+  void addToScene(ui.SceneBuilder builder) {
+    addChildrenToScene(builder);
   }
 
   /// Uploads all of this layer's children to the engine.
@@ -1103,14 +1100,10 @@ class ContainerLayer extends Layer {
   /// to apply effects to the scene using the [SceneBuilder] API, then insert
   /// their children using [addChildrenToScene], then reverse the aforementioned
   /// effects before returning from [addToScene].
-  void addChildrenToScene(ui.SceneBuilder builder, [ Offset childOffset = Offset.zero ]) {
+  void addChildrenToScene(ui.SceneBuilder builder) {
     Layer? child = firstChild;
     while (child != null) {
-      if (childOffset == Offset.zero) {
-        child._addToSceneWithRetainedRendering(builder);
-      } else {
-        child.addToScene(builder, childOffset);
-      }
+      child._addToSceneWithRetainedRendering(builder);
       child = child.nextSibling;
     }
   }
@@ -1233,15 +1226,15 @@ class OffsetLayer extends ContainerLayer {
   }
 
   @override
-  void addToScene(ui.SceneBuilder builder, [ Offset layerOffset = Offset.zero ]) {
+  void addToScene(ui.SceneBuilder builder) {
     // Skia has a fast path for concatenating scale/translation only matrices.
     // Hence pushing a translation-only transform layer should be fast. For
     // retained rendering, we don't want to push the offset down to each leaf
     // node. Otherwise, changing an offset layer on the very high level could
     // cascade the change to too many leaves.
     engineLayer = builder.pushOffset(
-      layerOffset.dx + offset.dx,
-      layerOffset.dy + offset.dy,
+      offset.dx,
+      offset.dy,
       oldLayer: _engineLayer as ui.OffsetEngineLayer?,
     );
     addChildrenToScene(builder);
@@ -1355,7 +1348,7 @@ class ClipRectLayer extends ContainerLayer {
   }
 
   @override
-  void addToScene(ui.SceneBuilder builder, [ Offset layerOffset = Offset.zero ]) {
+  void addToScene(ui.SceneBuilder builder) {
     assert(clipRect != null);
     assert(clipBehavior != null);
     bool enabled = true;
@@ -1364,16 +1357,15 @@ class ClipRectLayer extends ContainerLayer {
       return true;
     }());
     if (enabled) {
-      final Rect shiftedClipRect = layerOffset == Offset.zero ? clipRect! : clipRect!.shift(layerOffset);
       engineLayer = builder.pushClipRect(
-        shiftedClipRect,
+        clipRect!,
         clipBehavior: clipBehavior,
         oldLayer: _engineLayer as ui.ClipRectEngineLayer?,
       );
     } else {
       engineLayer = null;
     }
-    addChildrenToScene(builder, layerOffset);
+    addChildrenToScene(builder);
     if (enabled)
       builder.pop();
   }
@@ -1439,7 +1431,7 @@ class ClipRRectLayer extends ContainerLayer {
   }
 
   @override
-  void addToScene(ui.SceneBuilder builder, [ Offset layerOffset = Offset.zero ]) {
+  void addToScene(ui.SceneBuilder builder) {
     assert(clipRRect != null);
     assert(clipBehavior != null);
     bool enabled = true;
@@ -1448,16 +1440,15 @@ class ClipRRectLayer extends ContainerLayer {
       return true;
     }());
     if (enabled) {
-      final RRect shiftedClipRRect = layerOffset == Offset.zero ? clipRRect! : clipRRect!.shift(layerOffset);
       engineLayer = builder.pushClipRRect(
-        shiftedClipRRect,
+        clipRRect!,
         clipBehavior: clipBehavior,
         oldLayer: _engineLayer as ui.ClipRRectEngineLayer?,
       );
     } else {
       engineLayer = null;
     }
-    addChildrenToScene(builder, layerOffset);
+    addChildrenToScene(builder);
     if (enabled)
       builder.pop();
   }
@@ -1523,7 +1514,7 @@ class ClipPathLayer extends ContainerLayer {
   }
 
   @override
-  void addToScene(ui.SceneBuilder builder, [ Offset layerOffset = Offset.zero ]) {
+  void addToScene(ui.SceneBuilder builder) {
     assert(clipPath != null);
     assert(clipBehavior != null);
     bool enabled = true;
@@ -1532,16 +1523,15 @@ class ClipPathLayer extends ContainerLayer {
       return true;
     }());
     if (enabled) {
-      final Path shiftedPath = layerOffset == Offset.zero ? clipPath! : clipPath!.shift(layerOffset);
       engineLayer = builder.pushClipPath(
-        shiftedPath,
+        clipPath!,
         clipBehavior: clipBehavior,
         oldLayer: _engineLayer as ui.ClipPathEngineLayer?,
       );
     } else {
       engineLayer = null;
     }
-    addChildrenToScene(builder, layerOffset);
+    addChildrenToScene(builder);
     if (enabled)
       builder.pop();
   }
@@ -1578,13 +1568,13 @@ class ColorFilterLayer extends ContainerLayer {
   }
 
   @override
-  void addToScene(ui.SceneBuilder builder, [ Offset layerOffset = Offset.zero ]) {
+  void addToScene(ui.SceneBuilder builder) {
     assert(colorFilter != null);
     engineLayer = builder.pushColorFilter(
       colorFilter!,
       oldLayer: _engineLayer as ui.ColorFilterEngineLayer?,
     );
-    addChildrenToScene(builder, layerOffset);
+    addChildrenToScene(builder);
     builder.pop();
   }
 
@@ -1620,13 +1610,13 @@ class ImageFilterLayer extends ContainerLayer {
   }
 
   @override
-  void addToScene(ui.SceneBuilder builder, [ Offset layerOffset = Offset.zero ]) {
+  void addToScene(ui.SceneBuilder builder) {
     assert(imageFilter != null);
     engineLayer = builder.pushImageFilter(
       imageFilter!,
       oldLayer: _engineLayer as ui.ImageFilterEngineLayer?,
     );
-    addChildrenToScene(builder, layerOffset);
+    addChildrenToScene(builder);
     builder.pop();
   }
 
@@ -1677,12 +1667,11 @@ class TransformLayer extends OffsetLayer {
   bool _inverseDirty = true;
 
   @override
-  void addToScene(ui.SceneBuilder builder, [ Offset layerOffset = Offset.zero ]) {
+  void addToScene(ui.SceneBuilder builder) {
     assert(transform != null);
     _lastEffectiveTransform = transform;
-    final Offset totalOffset = offset + layerOffset;
-    if (totalOffset != Offset.zero) {
-      _lastEffectiveTransform = Matrix4.translationValues(totalOffset.dx, totalOffset.dy, 0.0)
+    if (offset != Offset.zero) {
+      _lastEffectiveTransform = Matrix4.translationValues(offset.dx, offset.dy, 0.0)
         ..multiply(_lastEffectiveTransform!);
     }
     engineLayer = builder.pushTransform(
@@ -1773,7 +1762,7 @@ class OpacityLayer extends OffsetLayer {
   }
 
   @override
-  void addToScene(ui.SceneBuilder builder, [ Offset layerOffset = Offset.zero ]) {
+  void addToScene(ui.SceneBuilder builder) {
     assert(alpha != null);
     bool enabled = firstChild != null;  // don't add this layer if there's no child
     if (!enabled) {
@@ -1792,14 +1781,14 @@ class OpacityLayer extends OffsetLayer {
       assert(_engineLayer is ui.OpacityEngineLayer?);
       engineLayer = builder.pushOpacity(
         realizedAlpha,
-        offset: offset + layerOffset,
+        offset: offset,
         oldLayer: _engineLayer as ui.OpacityEngineLayer?,
       );
     } else {
       assert(_engineLayer is ui.OffsetEngineLayer?);
       engineLayer = builder.pushOffset(
-        layerOffset.dx + offset.dx,
-        layerOffset.dy + offset.dy,
+        offset.dx,
+        offset.dy,
         oldLayer: _engineLayer as ui.OffsetEngineLayer?,
       );
     }
@@ -1884,19 +1873,17 @@ class ShaderMaskLayer extends ContainerLayer {
   }
 
   @override
-  void addToScene(ui.SceneBuilder builder, [ Offset layerOffset = Offset.zero ]) {
+  void addToScene(ui.SceneBuilder builder) {
     assert(shader != null);
     assert(maskRect != null);
     assert(blendMode != null);
-    assert(layerOffset != null);
-    final Rect shiftedMaskRect = layerOffset == Offset.zero ? maskRect! : maskRect!.shift(layerOffset);
     engineLayer = builder.pushShaderMask(
       shader!,
-      shiftedMaskRect,
+      maskRect! ,
       blendMode!,
       oldLayer: _engineLayer as ui.ShaderMaskEngineLayer?,
     );
-    addChildrenToScene(builder, layerOffset);
+    addChildrenToScene(builder);
     builder.pop();
   }
 
@@ -1954,14 +1941,14 @@ class BackdropFilterLayer extends ContainerLayer {
   }
 
   @override
-  void addToScene(ui.SceneBuilder builder, [ Offset layerOffset = Offset.zero ]) {
+  void addToScene(ui.SceneBuilder builder) {
     assert(filter != null);
     engineLayer = builder.pushBackdropFilter(
       filter!,
       blendMode: blendMode,
       oldLayer: _engineLayer as ui.BackdropFilterEngineLayer?,
     );
-    addChildrenToScene(builder, layerOffset);
+    addChildrenToScene(builder);
     builder.pop();
   }
 }
@@ -2067,7 +2054,7 @@ class PhysicalModelLayer extends ContainerLayer {
   }
 
   @override
-  void addToScene(ui.SceneBuilder builder, [ Offset layerOffset = Offset.zero ]) {
+  void addToScene(ui.SceneBuilder builder) {
     assert(clipPath != null);
     assert(clipBehavior != null);
     assert(elevation != null);
@@ -2081,7 +2068,7 @@ class PhysicalModelLayer extends ContainerLayer {
     }());
     if (enabled) {
       engineLayer = builder.pushPhysicalShape(
-        path: layerOffset == Offset.zero ? clipPath! : clipPath!.shift(layerOffset),
+        path: clipPath!,
         elevation: elevation!,
         color: color!,
         shadowColor: shadowColor,
@@ -2091,7 +2078,7 @@ class PhysicalModelLayer extends ContainerLayer {
     } else {
       engineLayer = null;
     }
-    addChildrenToScene(builder, layerOffset);
+    addChildrenToScene(builder);
     if (enabled)
       builder.pop();
   }
@@ -2202,9 +2189,9 @@ class LeaderLayer extends ContainerLayer {
   }
 
   @override
-  void addToScene(ui.SceneBuilder builder, [ Offset layerOffset = Offset.zero ]) {
+  void addToScene(ui.SceneBuilder builder) {
     assert(offset != null);
-    _lastOffset = offset + layerOffset;
+    _lastOffset = offset;
     if (_lastOffset != Offset.zero)
       engineLayer = builder.pushTransform(
         Matrix4.translationValues(_lastOffset!.dx, _lastOffset!.dy, 0.0).storage,
@@ -2472,7 +2459,7 @@ class FollowerLayer extends ContainerLayer {
   bool get alwaysNeedsAddToScene => true;
 
   @override
-  void addToScene(ui.SceneBuilder builder, [ Offset layerOffset = Offset.zero ]) {
+  void addToScene(ui.SceneBuilder builder) {
     assert(link != null);
     assert(showWhenUnlinked != null);
     if (link.leader == null && !showWhenUnlinked!) {
@@ -2490,7 +2477,7 @@ class FollowerLayer extends ContainerLayer {
       );
       addChildrenToScene(builder);
       builder.pop();
-      _lastOffset = unlinkedOffset! + layerOffset;
+      _lastOffset = unlinkedOffset;
     } else {
       _lastOffset = null;
       final Matrix4 matrix = Matrix4.translationValues(unlinkedOffset!.dx, unlinkedOffset!.dy, .0);

packages/flutter/lib/src/widgets/widget_inspector.dart

@@ -54,8 +54,8 @@ class _ProxyLayer extends Layer {
   final Layer _layer;
 
   @override
-  void addToScene(ui.SceneBuilder builder, [ Offset layerOffset = Offset.zero ]) {
-    _layer.addToScene(builder, layerOffset);
+  void addToScene(ui.SceneBuilder builder) {
+    _layer.addToScene(builder);
   }
 
   @override
@@ -319,8 +319,8 @@ Rect _calculateSubtreeBounds(RenderObject object) {
 /// screenshots render to the scene in the local coordinate system of the layer.
 class _ScreenshotContainerLayer extends OffsetLayer {
   @override
-  void addToScene(ui.SceneBuilder builder, [ Offset layerOffset = Offset.zero ]) {
-    addChildrenToScene(builder, layerOffset);
+  void addToScene(ui.SceneBuilder builder) {
+    addChildrenToScene(builder);
   }
 }
 
@@ -2665,7 +2665,7 @@ class _InspectorOverlayLayer extends Layer {
   double? _textPainterMaxWidth;
 
   @override
-  void addToScene(ui.SceneBuilder builder, [ Offset layerOffset = Offset.zero ]) {
+  void addToScene(ui.SceneBuilder builder) {
     if (!selection.active)
       return;
 
@@ -2694,7 +2694,7 @@ class _InspectorOverlayLayer extends Layer {
       _lastState = state;
       _picture = _buildPicture(state);
     }
-    builder.addPicture(layerOffset, _picture);
+    builder.addPicture(Offset.zero, _picture);
   }
 
   ui.Picture _buildPicture(_InspectorOverlayRenderState state) {

packages/flutter/test/rendering/layer_annotations_test.dart

@@ -845,7 +845,7 @@ class _TestAnnotatedLayer extends Layer {
   final Size? size;
 
   @override
-  EngineLayer? addToScene(SceneBuilder builder, [Offset layerOffset = Offset.zero]) {
+  EngineLayer? addToScene(SceneBuilder builder) {
     return null;
   }
 

packages/flutter/test/rendering/layers_test.dart

@@ -608,7 +608,7 @@ class FakePicture extends Fake implements Picture {
 
 class ConcreteLayer extends Layer {
   @override
-  void addToScene(SceneBuilder builder, [ Offset layerOffset = Offset.zero ]) {}
+  void addToScene(SceneBuilder builder) {}
 }
 
 class _TestAlwaysNeedsAddToSceneLayer extends ContainerLayer {