1 files changed, 132 insertions, 0 deletions
diff --git a/chromium/ash/rotator/screen_rotation.cc b/chromium/ash/rotator/screen_rotation.cc
new file mode 100644
index 00000000000..9352d81ea34
--- /dev/null
+++ b/chromium/ash/rotator/screen_rotation.cc
@@ -0,0 +1,132 @@
+// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "ash/rotator/screen_rotation.h"
+
+#include "base/time/time.h"
+#include "ui/compositor/layer.h"
+#include "ui/gfx/interpolated_transform.h"
+#include "ui/gfx/rect.h"
+#include "ui/gfx/transform.h"
+
+namespace ash {
+
+namespace {
+
+const int k90DegreeTransitionDurationMs = 350;
+const int k180DegreeTransitionDurationMs = 550;
+const int k360DegreeTransitionDurationMs = 750;
+
+base::TimeDelta GetTransitionDuration(int degrees) {
+  if (degrees == 360)
+    return base::TimeDelta::FromMilliseconds(k360DegreeTransitionDurationMs);
+  if (degrees == 180)
+    return base::TimeDelta::FromMilliseconds(k180DegreeTransitionDurationMs);
+  if (degrees == 0)
+    return base::TimeDelta::FromMilliseconds(0);
+  return base::TimeDelta::FromMilliseconds(k90DegreeTransitionDurationMs);
+}
+
+}  // namespace
+
+ScreenRotation::ScreenRotation(int degrees, ui::Layer* layer)
+    : ui::LayerAnimationElement(GetProperties(),
+                                GetTransitionDuration(degrees)),
+      degrees_(degrees) {
+  InitTransform(layer);
+}
+
+ScreenRotation::~ScreenRotation() {
+}
+
+void ScreenRotation::InitTransform(ui::Layer* layer) {
+  // No rotation required, use the identity transform.
+  if (degrees_ == 0) {
+    interpolated_transform_.reset(
+        new ui::InterpolatedConstantTransform(gfx::Transform()));
+    return;
+  }
+
+  // Use the target transform/bounds in case the layer is already animating.
+  const gfx::Transform& current_transform = layer->GetTargetTransform();
+  const gfx::Rect& bounds = layer->GetTargetBounds();
+
+  gfx::Point old_pivot;
+  gfx::Point new_pivot;
+
+  int width = bounds.width();
+  int height = bounds.height();
+
+  switch (degrees_) {
+    case 90:
+      new_origin_ = new_pivot = gfx::Point(width, 0);
+      break;
+    case -90:
+      new_origin_ = new_pivot = gfx::Point(0, height);
+      break;
+    case 180:
+    case 360:
+      new_pivot = old_pivot = gfx::Point(width / 2, height / 2);
+      new_origin_.SetPoint(width, height);
+      break;
+  }
+
+  // Convert points to world space.
+  current_transform.TransformPoint(&old_pivot);
+  current_transform.TransformPoint(&new_pivot);
+  current_transform.TransformPoint(&new_origin_);
+
+  scoped_ptr<ui::InterpolatedTransform> rotation(
+      new ui::InterpolatedTransformAboutPivot(
+          old_pivot,
+          new ui::InterpolatedRotation(0, degrees_)));
+
+  scoped_ptr<ui::InterpolatedTransform> translation(
+      new ui::InterpolatedTranslation(
+          gfx::Point(0, 0),
+          gfx::Point(new_pivot.x() - old_pivot.x(),
+                     new_pivot.y() - old_pivot.y())));
+
+  float scale_factor = 0.9f;
+  scoped_ptr<ui::InterpolatedTransform> scale_down(
+      new ui::InterpolatedScale(1.0f, scale_factor, 0.0f, 0.5f));
+
+  scoped_ptr<ui::InterpolatedTransform> scale_up(
+      new ui::InterpolatedScale(1.0f, 1.0f / scale_factor, 0.5f, 1.0f));
+
+  interpolated_transform_.reset(
+      new ui::InterpolatedConstantTransform(current_transform));
+
+  scale_up->SetChild(scale_down.release());
+  translation->SetChild(scale_up.release());
+  rotation->SetChild(translation.release());
+  interpolated_transform_->SetChild(rotation.release());
+}
+
+void ScreenRotation::OnStart(ui::LayerAnimationDelegate* delegate) {
+}
+
+bool ScreenRotation::OnProgress(double t,
+                                ui::LayerAnimationDelegate* delegate) {
+  delegate->SetTransformFromAnimation(interpolated_transform_->Interpolate(t));
+  return true;
+}
+
+void ScreenRotation::OnGetTarget(TargetValue* target) const {
+  target->transform = interpolated_transform_->Interpolate(1.0);
+}
+
+void ScreenRotation::OnAbort(ui::LayerAnimationDelegate* delegate) {
+}
+
+// static
+const ui::LayerAnimationElement::AnimatableProperties&
+ScreenRotation::GetProperties() {
+  static ui::LayerAnimationElement::AnimatableProperties properties;
+  if (properties.empty())
+    properties.insert(ui::LayerAnimationElement::TRANSFORM);
+  return properties;
+}
+
+}  // namespace ash