Compute bounds of animated layers

This adds support for computing the bounds of a box when
transformed by the animations currently running on layer.
This CL handles Scale and Translate animations, leaving
other TransformOperations for future CLs.

BUG=252472

Review URL: https://chromiumcodereview.appspot.com/21604002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@217845 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 25 insertions, 0 deletions

diff --git a/cc/animation/keyframed_animation_curve_unittest.cc b/cc/animation/keyframed_animation_curve_unittest.cc
index 32efc14..48f511c0 100644
--- a/cc/animation/keyframed_animation_curve_unittest.cc
+++ b/cc/animation/keyframed_animation_curve_unittest.cc
@@ -7,6 +7,7 @@
 #include "cc/animation/transform_operations.h"
 #include "testing/gmock/include/gmock/gmock.h"
 #include "testing/gtest/include/gtest/gtest.h"
+#include "ui/gfx/box_f.h"
 
 namespace cc {
 namespace {
@@ -332,5 +333,29 @@ TEST(KeyframedAnimationCurveTest, CubicBezierTimingFunction) {
   EXPECT_FLOAT_EQ(1.f, curve->GetValue(1.f));
 }
 
+// Tests that animated bounds are computed as expected.
+TEST(KeyframedAnimationCurveTest, AnimatedBounds) {
+  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);
+  curve->AddKeyframe(TransformKeyframe::Create(
+      0.5, operations1, scoped_ptr<TimingFunction>()));
+  TransformOperations operations2;
+  operations2.AppendTranslate(4.0, 1.0, 2.0);
+  curve->AddKeyframe(TransformKeyframe::Create(
+      1.0, operations2, EaseTimingFunction::Create()));
+
+  gfx::BoxF box(2.f, 3.f, 4.f, 1.f, 3.f, 2.f);
+  gfx::BoxF bounds;
+
+  EXPECT_TRUE(curve->AnimatedBoundsForBox(box, &bounds));
+  EXPECT_EQ(gfx::BoxF(2.f, 3.f, 3.f, 5.f, 6.f, 5.f).ToString(),
+            bounds.ToString());
+}
+
 }  // namespace
 }  // namespace cc