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::MaximumTargetScale(
  73     bool forward_direction,
  74     float* max_scale) const {
  75   return false;
  76 }
  77
  78 InverseTransformCurveAdapter::InverseTransformCurveAdapter(
  79     TransformAnimationCurveAdapter base_curve,
  80     gfx::Transform initial_value,
  81     base::TimeDelta duration)
  82     : base_curve_(base_curve),
  83       initial_value_(initial_value),
  84       duration_(duration) {
  85   effective_initial_value_ =
  86       base_curve_.GetValue(base::TimeDelta()) * initial_value_;
  87 }
  88
  89 InverseTransformCurveAdapter::~InverseTransformCurveAdapter() {
  90 }
  91
  92 base::TimeDelta InverseTransformCurveAdapter::Duration() const {
  93   return duration_;
  94 }
  95
  96 scoped_ptr<cc::AnimationCurve> InverseTransformCurveAdapter::Clone() const {
  97   return make_scoped_ptr(
  98       new InverseTransformCurveAdapter(base_curve_, initial_value_, duration_));
  99 }
 100
 101 gfx::Transform InverseTransformCurveAdapter::GetValue(base::TimeDelta t) const {
 102   if (t <= base::TimeDelta())
 103     return initial_value_;
 104
 105   gfx::Transform base_transform = base_curve_.GetValue(t);
 106   // Invert base
 107   gfx::Transform to_return(gfx::Transform::kSkipInitialization);
 108   bool is_invertible = base_transform.GetInverse(&to_return);
 109   DCHECK(is_invertible);
 110
 111   to_return.PreconcatTransform(effective_initial_value_);
 112   return to_return;
 113 }
 114
 115 bool InverseTransformCurveAdapter::AnimatedBoundsForBox(
 116     const gfx::BoxF& box,
 117     gfx::BoxF* bounds) const {
 118   // TODO(ajuma): Once cc::TransformOperation::BlendedBoundsForBox supports
 119   // computing bounds for TransformOperationMatrix, use that to compute
 120   // the bounds we need here.
 121   return false;
 122 }
 123
 124 bool InverseTransformCurveAdapter::AffectsScale() const {
 125   return !initial_value_.IsIdentityOrTranslation() ||
 126          base_curve_.AffectsScale();
 127 }
 128
 129 bool InverseTransformCurveAdapter::IsTranslation() const {
 130   return initial_value_.IsIdentityOrTranslation() &&
 131          base_curve_.IsTranslation();
 132 }
 133
 134 bool InverseTransformCurveAdapter::MaximumTargetScale(bool forward_direction,
 135                                                       float* max_scale) const {
 136   return false;
 137 }
 138
 139 }  // namespace ui