ui/compositor/transform_animation_curve_adapter.cc

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "ui/compositor/transform_animation_curve_adapter.h"
   6
   7 #include "cc/base/time_util.h"
   8
   9 namespace ui {
  10
  11 TransformAnimationCurveAdapter::TransformAnimationCurveAdapter(
  12     gfx::Tween::Type tween_type,
  13     gfx::Transform initial_value,
  14     gfx::Transform target_value,
  15     base::TimeDelta duration)
  16     : tween_type_(tween_type),
  17       initial_value_(initial_value),
  18       target_value_(target_value),
  19       duration_(duration) {
  20   gfx::DecomposeTransform(&decomposed_initial_value_, initial_value_);
  21   gfx::DecomposeTransform(&decomposed_target_value_, target_value_);
  22 }
  23
  24 TransformAnimationCurveAdapter::~TransformAnimationCurveAdapter() {
  25 }
  26
  27 base::TimeDelta TransformAnimationCurveAdapter::Duration() const {
  28   return duration_;
  29 }
  30
  31 scoped_ptr<cc::AnimationCurve> TransformAnimationCurveAdapter::Clone() const {
  32   return make_scoped_ptr(new TransformAnimationCurveAdapter(
  33       tween_type_, initial_value_, target_value_, duration_));
  34 }
  35
  36 gfx::Transform TransformAnimationCurveAdapter::GetValue(
  37     base::TimeDelta t) const {
  38   if (t >= duration_)
  39     return target_value_;
  40   if (t <= base::TimeDelta())
  41     return initial_value_;
  42   double progress = cc::TimeUtil::Divide(t, duration_);
  43
  44   gfx::DecomposedTransform to_return;
  45   gfx::BlendDecomposedTransforms(&to_return,
  46                                  decomposed_target_value_,
  47                                  decomposed_initial_value_,
  48                                  gfx::Tween::CalculateValue(tween_type_,
  49                                                             progress));
  50   return gfx::ComposeTransform(to_return);
  51 }
  52
  53 bool TransformAnimationCurveAdapter::AnimatedBoundsForBox(
  54     const gfx::BoxF& box,
  55     gfx::BoxF* bounds) const {
  56   // TODO(ajuma): Once cc::TransformOperation::BlendedBoundsForBox supports
  57   // computing bounds for TransformOperationMatrix, use that to compute
  58   // the bounds we need here.
  59   return false;
  60 }
  61
  62 bool TransformAnimationCurveAdapter::AffectsScale() const {
  63   return !initial_value_.IsIdentityOrTranslation() ||
  64          !target_value_.IsIdentityOrTranslation();
  65 }
  66
  67 bool TransformAnimationCurveAdapter::IsTranslation() const {
  68   return initial_value_.IsIdentityOrTranslation() &&
  69          target_value_.IsIdentityOrTranslation();
  70 }
  71
  72 bool TransformAnimationCurveAdapter::PreservesAxisAlignment() const {
  73   return (initial_value_.IsIdentity() ||
  74           initial_value_.IsScaleOrTranslation()) &&
  75          (target_value_.IsIdentity() || target_value_.IsScaleOrTranslation());
  76 }
  77
  78 bool TransformAnimationCurveAdapter::MaximumTargetScale(
  79     bool forward_direction,
  80     float* max_scale) const {
  81   return false;
  82 }
  83
  84 InverseTransformCurveAdapter::InverseTransformCurveAdapter(
  85     TransformAnimationCurveAdapter base_curve,
  86     gfx::Transform initial_value,
  87     base::TimeDelta duration)
  88     : base_curve_(base_curve),
  89       initial_value_(initial_value),
  90       duration_(duration) {
  91   effective_initial_value_ =
  92       base_curve_.GetValue(base::TimeDelta()) * initial_value_;
  93 }
  94
  95 InverseTransformCurveAdapter::~InverseTransformCurveAdapter() {
  96 }
  97
  98 base::TimeDelta InverseTransformCurveAdapter::Duration() const {
  99   return duration_;
 100 }
 101
 102 scoped_ptr<cc::AnimationCurve> InverseTransformCurveAdapter::Clone() const {
 103   return make_scoped_ptr(
 104       new InverseTransformCurveAdapter(base_curve_, initial_value_, duration_));
 105 }
 106
 107 gfx::Transform InverseTransformCurveAdapter::GetValue(base::TimeDelta t) const {
 108   if (t <= base::TimeDelta())
 109     return initial_value_;
 110
 111   gfx::Transform base_transform = base_curve_.GetValue(t);
 112   // Invert base
 113   gfx::Transform to_return(gfx::Transform::kSkipInitialization);
 114   bool is_invertible = base_transform.GetInverse(&to_return);
 115   DCHECK(is_invertible);
 116
 117   to_return.PreconcatTransform(effective_initial_value_);
 118   return to_return;
 119 }
 120
 121 bool InverseTransformCurveAdapter::AnimatedBoundsForBox(
 122     const gfx::BoxF& box,
 123     gfx::BoxF* bounds) const {
 124   // TODO(ajuma): Once cc::TransformOperation::BlendedBoundsForBox supports
 125   // computing bounds for TransformOperationMatrix, use that to compute
 126   // the bounds we need here.
 127   return false;
 128 }
 129
 130 bool InverseTransformCurveAdapter::AffectsScale() const {
 131   return !initial_value_.IsIdentityOrTranslation() ||
 132          base_curve_.AffectsScale();
 133 }
 134
 135 bool InverseTransformCurveAdapter::IsTranslation() const {
 136   return initial_value_.IsIdentityOrTranslation() &&
 137          base_curve_.IsTranslation();
 138 }
 139
 140 bool InverseTransformCurveAdapter::PreservesAxisAlignment() const {
 141   return (initial_value_.IsIdentity() ||
 142           initial_value_.IsScaleOrTranslation()) &&
 143          (base_curve_.PreservesAxisAlignment());
 144 }
 145
 146 bool InverseTransformCurveAdapter::MaximumTargetScale(bool forward_direction,
 147                                                       float* max_scale) const {
 148   return false;
 149 }
 150
 151 }  // namespace ui