From 059e4e6d8ff6de39c29441c53e949bfb0bf17972 Mon Sep 17 00:00:00 2001
From: Kevin Chisholm <kevinjchisholm@gmail.com>
Date: Tue, 10 Sep 2024 14:13:50 -0500
Subject: [PATCH 1/2] [flutter_releases] Flutter beta 3.26.0-0.1.pre Engine
 Cherrypicks (#55077)

# Flutter beta 3.26.0-0.1.pre Engine

## Scheduled Cherrypicks

- Roll dart revision: dart-lang/sdk@0ebf221eb
---
 DEPS | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/DEPS b/DEPS
index fd2887c62abc8..d3ab63e64a36a 100644
--- a/DEPS
+++ b/DEPS
@@ -56,7 +56,7 @@ vars = {
   # Dart is: https://github.com/dart-lang/sdk/blob/main/DEPS
   # You can use //tools/dart/create_updated_flutter_deps.py to produce
   # updated revision list of existing dependencies.
-  'dart_revision': '1a6246225b75aae44a5cba2b98ee6d55ecfc89b6',
+  'dart_revision': '0ebf221eba41759d6c1588fe564a4aab2ebdcb4c',
 
   # WARNING: DO NOT EDIT MANUALLY
   # The lines between blank lines above and below are generated by a script. See create_updated_flutter_deps.py

From d572fc8a2fb4438bd0c9454d4454ba154a252556 Mon Sep 17 00:00:00 2001
From: gaaclarke <30870216+gaaclarke@users.noreply.github.com>
Date: Wed, 16 Oct 2024 13:13:25 -0700
Subject: [PATCH 2/2] Starts looking for the bdf fast path in relation to the
 snapshot_entity's transform (#55890)

fixes https://github.com/flutter/flutter/issues/156871

testing: performance change covered by existing benchmarks.

[C++, Objective-C, Java style guides]: https://github.com/flutter/engine/blob/main/CONTRIBUTING.md#style
---
 .../filters/gaussian_blur_filter_contents.cc  |  2 +-
 impeller/geometry/matrix.h                    | 21 +++++++++++++++++++
 impeller/geometry/matrix_unittests.cc         | 12 +++++++++++
 impeller/geometry/scalar.h                    |  5 +++++
 4 files changed, 39 insertions(+), 1 deletion(-)

diff --git a/impeller/entity/contents/filters/gaussian_blur_filter_contents.cc b/impeller/entity/contents/filters/gaussian_blur_filter_contents.cc
index c8fda3376c814..1d28bd02f46d9 100644
--- a/impeller/entity/contents/filters/gaussian_blur_filter_contents.cc
+++ b/impeller/entity/contents/filters/gaussian_blur_filter_contents.cc
@@ -241,7 +241,7 @@ DownsamplePassArgs CalculateDownsamplePassArgs(
   //     .Contains(coverage_hint.value()))
 
   std::optional<Rect> snapshot_coverage = input_snapshot.GetCoverage();
-  if (input_snapshot.transform.IsIdentity() &&
+  if (input_snapshot.transform.Equals(snapshot_entity.GetTransform()) &&
       source_expanded_coverage_hint.has_value() &&
       snapshot_coverage.has_value() &&
       snapshot_coverage->Contains(source_expanded_coverage_hint.value())) {
diff --git a/impeller/geometry/matrix.h b/impeller/geometry/matrix.h
index 5b70ab9870dab..b8d243a8a0001 100644
--- a/impeller/geometry/matrix.h
+++ b/impeller/geometry/matrix.h
@@ -409,6 +409,27 @@ struct Matrix {
 
   std::optional<MatrixDecomposition> Decompose() const;
 
+  bool Equals(const Matrix& matrix, Scalar epsilon = 1e-5f) const {
+    const Scalar* a = m;
+    const Scalar* b = matrix.m;
+    return ScalarNearlyEqual(a[0], b[0], epsilon) &&
+           ScalarNearlyEqual(a[1], b[1], epsilon) &&
+           ScalarNearlyEqual(a[2], b[2], epsilon) &&
+           ScalarNearlyEqual(a[3], b[3], epsilon) &&
+           ScalarNearlyEqual(a[4], b[4], epsilon) &&
+           ScalarNearlyEqual(a[5], b[5], epsilon) &&
+           ScalarNearlyEqual(a[6], b[6], epsilon) &&
+           ScalarNearlyEqual(a[7], b[7], epsilon) &&
+           ScalarNearlyEqual(a[8], b[8], epsilon) &&
+           ScalarNearlyEqual(a[9], b[9], epsilon) &&
+           ScalarNearlyEqual(a[10], b[10], epsilon) &&
+           ScalarNearlyEqual(a[11], b[11], epsilon) &&
+           ScalarNearlyEqual(a[12], b[12], epsilon) &&
+           ScalarNearlyEqual(a[13], b[13], epsilon) &&
+           ScalarNearlyEqual(a[14], b[14], epsilon) &&
+           ScalarNearlyEqual(a[15], b[15], epsilon);
+  }
+
   constexpr bool operator==(const Matrix& m) const {
     // clang-format off
     return vec[0] == m.vec[0]
diff --git a/impeller/geometry/matrix_unittests.cc b/impeller/geometry/matrix_unittests.cc
index 1cb7930ec52bf..4bebb9ab53aaf 100644
--- a/impeller/geometry/matrix_unittests.cc
+++ b/impeller/geometry/matrix_unittests.cc
@@ -25,6 +25,18 @@ TEST(MatrixTest, Multiply) {
                                         11.0, 21.0, 0.0, 1.0)));
 }
 
+TEST(MatrixTest, Equals) {
+  Matrix x;
+  Matrix y = x;
+  EXPECT_TRUE(x.Equals(y));
+}
+
+TEST(MatrixTest, NotEquals) {
+  Matrix x;
+  Matrix y = x.Translate({1, 0, 0});
+  EXPECT_FALSE(x.Equals(y));
+}
+
 TEST(MatrixTest, HasPerspective2D) {
   EXPECT_FALSE(Matrix().HasPerspective2D());
 
diff --git a/impeller/geometry/scalar.h b/impeller/geometry/scalar.h
index 2600a49c42dc5..dadc52850cb5f 100644
--- a/impeller/geometry/scalar.h
+++ b/impeller/geometry/scalar.h
@@ -22,6 +22,11 @@ constexpr T Absolute(const T& val) {
   return val >= T{} ? val : -val;
 }
 
+template <>
+constexpr Scalar Absolute<Scalar>(const float& val) {
+  return fabsf(val);
+}
+
 constexpr inline bool ScalarNearlyZero(Scalar x,
                                        Scalar tolerance = kEhCloseEnough) {
   return Absolute(x) <= tolerance;