cc: Compute the maximum scale of animations

This adds MaximumScale and HasOnlyTranslationTransforms
methods to LayerAnimationController. 

BUG=224913

Review URL: https://codereview.chromium.org/214003004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@261583 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 63 insertions, 0 deletions

diff --git a/cc/animation/keyframed_animation_curve_unittest.cc b/cc/animation/keyframed_animation_curve_unittest.cc
index 1fb14966..eceba6f 100644
--- a/cc/animation/keyframed_animation_curve_unittest.cc
+++ b/cc/animation/keyframed_animation_curve_unittest.cc
@@ -482,5 +482,68 @@ TEST(KeyframedAnimationCurveTest, AffectsScale) {
   EXPECT_TRUE(curve->AffectsScale());
 }
 
+// Tests that animations that are translations are correctly identified.
+TEST(KeyframedAnimationCurveTest, IsTranslation) {
+  scoped_ptr<KeyframedTransformAnimationCurve> curve(
+      KeyframedTransformAnimationCurve::Create());
+
+  TransformOperations operations1;
+  curve->AddKeyframe(TransformKeyframe::Create(
+      0.0, operations1, scoped_ptr<TimingFunction>()));
+  operations1.AppendTranslate(2.0, 3.0, -1.0);
+  TransformOperations operations2;
+  operations2.AppendTranslate(4.0, 1.0, 2.0);
+  curve->AddKeyframe(TransformKeyframe::Create(
+      1.0, operations2, scoped_ptr<TimingFunction>()));
+
+  EXPECT_TRUE(curve->IsTranslation());
+
+  TransformOperations operations3;
+  operations3.AppendScale(2.f, 2.f, 2.f);
+  curve->AddKeyframe(TransformKeyframe::Create(
+      2.0, operations3, scoped_ptr<TimingFunction>()));
+
+  EXPECT_FALSE(curve->IsTranslation());
+
+  TransformOperations operations4;
+  operations3.AppendTranslate(2.f, 2.f, 2.f);
+  curve->AddKeyframe(TransformKeyframe::Create(
+      3.0, operations4, scoped_ptr<TimingFunction>()));
+
+  EXPECT_FALSE(curve->IsTranslation());
+}
+
+// Tests that maximum scale is computed as expected.
+TEST(KeyframedAnimationCurveTest, MaximumScale) {
+  scoped_ptr<KeyframedTransformAnimationCurve> curve(
+      KeyframedTransformAnimationCurve::Create());
+
+  TransformOperations operations1;
+  curve->AddKeyframe(TransformKeyframe::Create(
+      0.0, operations1, scoped_ptr<TimingFunction>()));
+  operations1.AppendScale(2.f, -3.f, 1.f);
+  curve->AddKeyframe(TransformKeyframe::Create(
+      1.0, operations1, EaseTimingFunction::Create()));
+
+  float maximum_scale = 0.f;
+  EXPECT_TRUE(curve->MaximumScale(&maximum_scale));
+  EXPECT_EQ(3.f, maximum_scale);
+
+  TransformOperations operations2;
+  operations2.AppendScale(6.f, 3.f, 2.f);
+  curve->AddKeyframe(TransformKeyframe::Create(
+      2.0, operations2, EaseTimingFunction::Create()));
+
+  EXPECT_TRUE(curve->MaximumScale(&maximum_scale));
+  EXPECT_EQ(6.f, maximum_scale);
+
+  TransformOperations operations3;
+  operations3.AppendRotate(1.f, 0.f, 0.f, 90.f);
+  curve->AddKeyframe(TransformKeyframe::Create(
+      3.0, operations3, EaseTimingFunction::Create()));
+
+  EXPECT_FALSE(curve->MaximumScale(&maximum_scale));
+}
+
 }  // namespace
 }  // namespace cc