Move path part files to libraries

ci/licenses_golden/licenses_flutter

@@ -482,6 +482,7 @@ FILE: ../../../flutter/lib/web_ui/lib/src/engine/color_filter.dart
 FILE: ../../../flutter/lib/web_ui/lib/src/engine/dom_canvas.dart
 FILE: ../../../flutter/lib/web_ui/lib/src/engine/dom_renderer.dart
 FILE: ../../../flutter/lib/web_ui/lib/src/engine/engine_canvas.dart
+FILE: ../../../flutter/lib/web_ui/lib/src/engine/font_change_util.dart
 FILE: ../../../flutter/lib/web_ui/lib/src/engine/frame_reference.dart
 FILE: ../../../flutter/lib/web_ui/lib/src/engine/html/backdrop_filter.dart
 FILE: ../../../flutter/lib/web_ui/lib/src/engine/html/canvas.dart
@@ -495,12 +496,14 @@ FILE: ../../../flutter/lib/web_ui/lib/src/engine/html/painting.dart
 FILE: ../../../flutter/lib/web_ui/lib/src/engine/html/path/conic.dart
 FILE: ../../../flutter/lib/web_ui/lib/src/engine/html/path/cubic.dart
 FILE: ../../../flutter/lib/web_ui/lib/src/engine/html/path/path.dart
+FILE: ../../../flutter/lib/web_ui/lib/src/engine/html/path/path_iterator.dart
 FILE: ../../../flutter/lib/web_ui/lib/src/engine/html/path/path_metrics.dart
 FILE: ../../../flutter/lib/web_ui/lib/src/engine/html/path/path_ref.dart
 FILE: ../../../flutter/lib/web_ui/lib/src/engine/html/path/path_to_svg.dart
 FILE: ../../../flutter/lib/web_ui/lib/src/engine/html/path/path_utils.dart
 FILE: ../../../flutter/lib/web_ui/lib/src/engine/html/path/path_windings.dart
 FILE: ../../../flutter/lib/web_ui/lib/src/engine/html/path/tangent.dart
+FILE: ../../../flutter/lib/web_ui/lib/src/engine/html/path_to_svg_clip.dart
 FILE: ../../../flutter/lib/web_ui/lib/src/engine/html/picture.dart
 FILE: ../../../flutter/lib/web_ui/lib/src/engine/html/platform_view.dart
 FILE: ../../../flutter/lib/web_ui/lib/src/engine/html/recording_canvas.dart

lib/web_ui/lib/src/engine.dart

@@ -38,6 +38,27 @@ export 'engine/alarm_clock.dart';
 import 'engine/browser_detection.dart';
 export 'engine/browser_detection.dart';
 
+import 'engine/html/path_to_svg_clip.dart';
+export 'engine/html/path_to_svg_clip.dart';
+
+import 'engine/html/path/conic.dart';
+export 'engine/html/path/conic.dart';
+
+import 'engine/html/path/cubic.dart';
+export 'engine/html/path/cubic.dart';
+
+import 'engine/html/path/path_iterator.dart';
+export 'engine/html/path/path_iterator.dart';
+
+import 'engine/html/path/path_metrics.dart';
+export 'engine/html/path/path_metrics.dart';
+
+import 'engine/html/path/path_ref.dart';
+export 'engine/html/path/path_ref.dart';
+
+import 'engine/html/path/path_utils.dart';
+export 'engine/html/path/path_utils.dart';
+
 import 'engine/mouse_cursor.dart';
 export 'engine/mouse_cursor.dart';
 
@@ -83,6 +104,9 @@ export 'engine/test_embedding.dart';
 import 'engine/ulps.dart';
 export 'engine/ulps.dart';
 
+import 'engine/util.dart';
+export 'engine/util.dart';
+
 import 'engine/validators.dart';
 export 'engine/validators.dart';
 
@@ -141,13 +165,8 @@ part 'engine/html/image_filter.dart';
 part 'engine/html/offset.dart';
 part 'engine/html/opacity.dart';
 part 'engine/html/painting.dart';
-part 'engine/html/path/conic.dart';
-part 'engine/html/path/cubic.dart';
 part 'engine/html/path/path.dart';
-part 'engine/html/path/path_metrics.dart';
-part 'engine/html/path/path_ref.dart';
 part 'engine/html/path/path_to_svg.dart';
-part 'engine/html/path/path_utils.dart';
 part 'engine/html/path/path_windings.dart';
 part 'engine/html/path/tangent.dart';
 part 'engine/html/picture.dart';
@@ -200,7 +219,7 @@ part 'engine/text_editing/autofill_hint.dart';
 part 'engine/text_editing/input_type.dart';
 part 'engine/text_editing/text_capitalization.dart';
 part 'engine/text_editing/text_editing.dart';
-part 'engine/util.dart';
+part 'engine/font_change_util.dart';
 part 'engine/window.dart';
 
 // The mode the app is running in.

lib/web_ui/lib/src/engine/canvas_pool.dart

@@ -193,7 +193,7 @@ class _CanvasPool extends _SaveStackTracking {
         } catch (e) {
           // Firefox may explode here:
           // https://bugzilla.mozilla.org/show_bug.cgi?id=941146
-          if (!_isNsErrorFailureException(e)) {
+          if (!isNsErrorFailureException(e)) {
             rethrow;
           }
         }

lib/web_ui/lib/src/engine/canvaskit/canvaskit_canvas.dart

@@ -135,8 +135,8 @@ class CanvasKitCanvas implements ui.Canvas {
 
   @override
   void drawLine(ui.Offset p1, ui.Offset p2, ui.Paint paint) {
-    assert(_offsetIsValid(p1));
-    assert(_offsetIsValid(p2));
+    assert(offsetIsValid(p1));
+    assert(offsetIsValid(p2));
     assert(paint != null); // ignore: unnecessary_null_comparison
     _drawLine(p1, p2, paint);
   }
@@ -202,7 +202,7 @@ class CanvasKitCanvas implements ui.Canvas {
 
   @override
   void drawCircle(ui.Offset c, double radius, ui.Paint paint) {
-    assert(_offsetIsValid(c));
+    assert(offsetIsValid(c));
     assert(paint != null); // ignore: unnecessary_null_comparison
     _drawCircle(c, radius, paint);
   }
@@ -236,7 +236,7 @@ class CanvasKitCanvas implements ui.Canvas {
   void drawImage(ui.Image image, ui.Offset p, ui.Paint paint) {
     // ignore: unnecessary_null_comparison
     assert(image != null); // image is checked on the engine side
-    assert(_offsetIsValid(p));
+    assert(offsetIsValid(p));
     assert(paint != null); // ignore: unnecessary_null_comparison
     _canvas.drawImage(image as CkImage, p, paint as CkPaint);
   }
@@ -272,7 +272,7 @@ class CanvasKitCanvas implements ui.Canvas {
   @override
   void drawParagraph(ui.Paragraph paragraph, ui.Offset offset) {
     assert(paragraph != null); // ignore: unnecessary_null_comparison
-    assert(_offsetIsValid(offset));
+    assert(offsetIsValid(offset));
     _drawParagraph(paragraph, offset);
   }
 

lib/web_ui/lib/src/engine/canvaskit/shader.dart

@@ -17,14 +17,14 @@ abstract class CkShader extends ManagedSkiaObject<SkShader>
 class CkGradientSweep extends CkShader implements ui.Gradient {
   CkGradientSweep(this.center, this.colors, this.colorStops, this.tileMode,
       this.startAngle, this.endAngle, this.matrix4)
-      : assert(_offsetIsValid(center)),
+      : assert(offsetIsValid(center)),
         assert(colors != null), // ignore: unnecessary_null_comparison
         assert(tileMode != null), // ignore: unnecessary_null_comparison
         assert(startAngle != null), // ignore: unnecessary_null_comparison
         assert(endAngle != null), // ignore: unnecessary_null_comparison
         assert(startAngle < endAngle),
-        assert(matrix4 == null || _matrix4IsValid(matrix4)) {
-    _validateColorStops(colors, colorStops);
+        assert(matrix4 == null || matrix4IsValid(matrix4)) {
+    validateColorStops(colors, colorStops);
   }
 
   final ui.Offset center;
@@ -65,14 +65,14 @@ class CkGradientLinear extends CkShader implements ui.Gradient {
     this.colorStops,
     this.tileMode,
     Float32List? matrix,
-  )   : assert(_offsetIsValid(from)),
-        assert(_offsetIsValid(to)),
+  )   : assert(offsetIsValid(from)),
+        assert(offsetIsValid(to)),
         assert(colors != null), // ignore: unnecessary_null_comparison
         assert(tileMode != null), // ignore: unnecessary_null_comparison
         this.matrix4 = matrix {
     if (assertionsEnabled) {
-      assert(matrix4 == null || _matrix4IsValid(matrix4!));
-      _validateColorStops(colors, colorStops);
+      assert(matrix4 == null || matrix4IsValid(matrix4!));
+      validateColorStops(colors, colorStops);
     }
   }
 

lib/web_ui/lib/src/engine/font_change_util.dart

@@ -0,0 +1,28 @@
+// Copyright 2013 The Flutter Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+part of engine;
+
+final ByteData? _fontChangeMessage =
+    JSONMessageCodec().encodeMessage(<String, dynamic>{'type': 'fontsChange'});
+
+// Font load callbacks will typically arrive in sequence, we want to prevent
+// sendFontChangeMessage of causing multiple synchronous rebuilds.
+// This flag ensures we properly schedule a single call to framework.
+bool _fontChangeScheduled = false;
+
+FutureOr<void> sendFontChangeMessage() async {
+  if (!_fontChangeScheduled) {
+    _fontChangeScheduled = true;
+    // Batch updates into next animationframe.
+    html.window.requestAnimationFrame((num _) {
+      _fontChangeScheduled = false;
+      EnginePlatformDispatcher.instance.invokeOnPlatformMessage(
+        'flutter/system',
+        _fontChangeMessage,
+        (_) {},
+      );
+    });
+  }
+}

lib/web_ui/lib/src/engine/html/clip.dart

@@ -326,12 +326,12 @@ class PersistedPhysicalShape extends PersistedContainerSurface
     /// to clipping rect bounds (which is the case for elevation == 0.0 where
     /// we shift outer/inner clip area instead to position clip-path).
     final String svgClipPath = elevation == 0.0
-        ? _pathToSvgClipPath(path,
+        ? pathToSvgClipPath(path,
             offsetX: -pathBounds.left,
             offsetY: -pathBounds.top,
             scaleX: 1.0 / pathBounds.width,
             scaleY: 1.0 / pathBounds.height)
-        : _pathToSvgClipPath(path,
+        : pathToSvgClipPath(path,
             offsetX: 0.0,
             offsetY: 0.0,
             scaleX: 1.0 / pathBounds.right,
@@ -345,7 +345,7 @@ class PersistedPhysicalShape extends PersistedContainerSurface
         html.Element.html(svgClipPath, treeSanitizer: _NullTreeSanitizer());
     domRenderer.append(rootElement!, _clipElement!);
     if (elevation == 0.0) {
-      DomRenderer.setClipPath(rootElement!, 'url(#svgClip$_clipIdCounter)');
+      DomRenderer.setClipPath(rootElement!, createSvgClipUrl());
       final html.CssStyleDeclaration rootElementStyle = rootElement!.style;
       rootElementStyle
         ..overflow = ''
@@ -360,7 +360,7 @@ class PersistedPhysicalShape extends PersistedContainerSurface
       return;
     }
 
-    DomRenderer.setClipPath(childContainer!, 'url(#svgClip$_clipIdCounter)');
+    DomRenderer.setClipPath(childContainer!, createSvgClipUrl());
     final html.CssStyleDeclaration rootElementStyle = rootElement!.style;
     rootElementStyle
       ..overflow = ''
@@ -500,9 +500,9 @@ class PersistedClipPath extends PersistedContainerSurface
 /// Creates an svg clipPath and applies it to [element].
 String createSvgClipDef(html.HtmlElement element, ui.Path clipPath) {
   final ui.Rect pathBounds = clipPath.getBounds();
-  final String svgClipPath = _pathToSvgClipPath(clipPath,
+  final String svgClipPath = pathToSvgClipPath(clipPath,
       scaleX: 1.0 / pathBounds.right, scaleY: 1.0 / pathBounds.bottom);
-  DomRenderer.setClipPath(element, 'url(#svgClip$_clipIdCounter)');
+  DomRenderer.setClipPath(element, createSvgClipUrl());
   // We need to set width and height for the clipElement to cover the
   // bounds of the path since browsers such as Safari and Edge
   // seem to incorrectly intersect the element bounding rect with

lib/web_ui/lib/src/engine/html/path/conic.dart

@@ -2,7 +2,12 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-part of engine;
+import 'dart:typed_data';
+import 'dart:math' as math;
+
+import 'package:ui/ui.dart' as ui;
+
+import 'path_utils.dart';
 
 /// Converts conic curve to a list of quadratic curves for rendering on
 /// canvas or conversion to svg.
@@ -198,7 +203,7 @@ class Conic {
     final double coeff0 = fW * p20 - p20;
     final double coeff1 = p20 - 2 * wP10;
     final double coeff2 = wP10;
-    final _QuadRoots quadRoots = _QuadRoots();
+    final QuadRoots quadRoots = QuadRoots();
     int rootCount = quadRoots.findRoots(coeff0, coeff1, coeff2);
     assert(rootCount == 0 || rootCount == 1);
     if (rootCount == 1) {
@@ -230,12 +235,12 @@ class Conic {
     final double dz1 = dz0 + (dz2 - dz0) * t;
     // Compute new weights.
     final double root = math.sqrt(dz1);
-    if (_nearlyEqual(root, 0)) {
+    if (SPath.nearlyEqual(root, 0)) {
       return false;
     }
     final double w0 = dz0 / root;
     final double w2 = dz2 / root;
-    if (_nearlyEqual(dz0, 0) || _nearlyEqual(dz1, 0) || _nearlyEqual(dz2, 0)) {
+    if (SPath.nearlyEqual(dz0, 0) || SPath.nearlyEqual(dz1, 0) || SPath.nearlyEqual(dz2, 0)) {
       return false;
     }
     // Now we can construct the 2 conics by projecting 3D down to 2D.
@@ -314,33 +319,34 @@ class Conic {
     double ay = fW * p20y - p20y;
     double bx = p20x - cx - cx;
     double by = p20y - cy - cy;
-    _SkQuadCoefficients quadC = _SkQuadCoefficients(ax, ay, bx, by, cx, cy);
+    SkQuadCoefficients quadC = SkQuadCoefficients(ax, ay, bx, by, cx, cy);
     return ui.Offset(quadC.evalX(t), quadC.evalY(t));
   }
-}
 
-double _conicEvalNumerator(
-    double p0, double p1, double p2, double w, double t) {
-  assert(t >= 0 && t <= 1);
-  final double src2w = p1 * w;
-  final C = p0;
-  final A = p2 - 2 * src2w + C;
-  final B = 2 * (src2w - C);
-  return polyEval(A, B, C, t);
-}
+  static double evalNumerator(
+      double p0, double p1, double p2, double w, double t) {
+    assert(t >= 0 && t <= 1);
+    final double src2w = p1 * w;
+    final C = p0;
+    final A = p2 - 2 * src2w + C;
+    final B = 2 * (src2w - C);
+    return polyEval(A, B, C, t);
+  }
 
-double _conicEvalDenominator(double w, double t) {
-  double B = 2 * (w - 1);
-  double C = 1;
-  double A = -B;
-  return polyEval(A, B, C, t);
+  static double evalDenominator(double w, double t) {
+    double B = 2 * (w - 1);
+    double C = 1;
+    double A = -B;
+    return polyEval(A, B, C, t);
+  }
 }
 
-class _QuadBounds {
+class QuadBounds {
   double minX = 0;
   double minY = 0;
   double maxX = 0;
   double maxY = 0;
+
   void calculateBounds(Float32List points, int pointIndex) {
     final double x1 = points[pointIndex++];
     final double y1 = points[pointIndex++];
@@ -398,7 +404,7 @@ class _QuadBounds {
   }
 }
 
-class _ConicBounds {
+class ConicBounds {
   double minX = 0;
   double minY = 0;
   double maxX = 0;
@@ -420,7 +426,7 @@ class _ConicBounds {
     // ------------------------------------------------
     //       {t^2 (2 - 2 w), t (-2 + 2 w), 1}
     // Calculate coefficients and solve root.
-    _QuadRoots roots = _QuadRoots();
+    QuadRoots roots = QuadRoots();
     final double P20x = x2 - x1;
     final double P10x = cpX - x1;
     final double wP10x = w * P10x;
@@ -431,10 +437,10 @@ class _ConicBounds {
     if (n != 0) {
       final double t1 = roots.root0!;
       if ((t1 >= 0) && (t1 <= 1.0)) {
-        final double denom = _conicEvalDenominator(w, t1);
-        double numerator = _conicEvalNumerator(x1, cpX, x2, w, t1);
+        final double denom = Conic.evalDenominator(w, t1);
+        double numerator = Conic.evalNumerator(x1, cpX, x2, w, t1);
         final double extremaX = numerator / denom;
-        numerator = _conicEvalNumerator(y1, cpY, y2, w, t1);
+        numerator = Conic.evalNumerator(y1, cpY, y2, w, t1);
         final double extremaY = numerator / denom;
         // Expand bounds.
         minX = math.min(minX, extremaX);
@@ -454,10 +460,10 @@ class _ConicBounds {
     if (n != 0) {
       final double t2 = roots.root0!;
       if ((t2 >= 0) && (t2 <= 1.0)) {
-        final double denom = _conicEvalDenominator(w, t2);
-        double numerator = _conicEvalNumerator(x1, cpX, x2, w, t2);
+        final double denom = Conic.evalDenominator(w, t2);
+        double numerator = Conic.evalNumerator(x1, cpX, x2, w, t2);
         final double extrema2X = numerator / denom;
-        numerator = _conicEvalNumerator(y1, cpY, y2, w, t2);
+        numerator = Conic.evalNumerator(y1, cpY, y2, w, t2);
         final double extrema2Y = numerator / denom;
         // Expand bounds.
         minX = math.min(minX, extrema2X);