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| 1 // Copyright 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 "cc/input/page_scale_animation.h" | |
| 6 | |
| 7 #include <math.h> | |
| 8 | |
| 9 #include "base/logging.h" | |
| 10 #include "cc/animation/timing_function.h" | |
| 11 #include "ui/gfx/geometry/point_f.h" | |
| 12 #include "ui/gfx/geometry/rect_f.h" | |
| 13 #include "ui/gfx/geometry/vector2d_conversions.h" | |
| 14 | |
| 15 namespace { | |
| 16 | |
| 17 // This takes a viewport-relative vector and returns a vector whose values are | |
| 18 // between 0 and 1, representing the percentage position within the viewport. | |
| 19 gfx::Vector2dF NormalizeFromViewport(const gfx::Vector2dF& denormalized, | |
| 20 const gfx::SizeF& viewport_size) { | |
| 21 return gfx::ScaleVector2d(denormalized, | |
| 22 1.f / viewport_size.width(), | |
| 23 1.f / viewport_size.height()); | |
| 24 } | |
| 25 | |
| 26 gfx::Vector2dF DenormalizeToViewport(const gfx::Vector2dF& normalized, | |
| 27 const gfx::SizeF& viewport_size) { | |
| 28 return gfx::ScaleVector2d(normalized, | |
| 29 viewport_size.width(), | |
| 30 viewport_size.height()); | |
| 31 } | |
| 32 | |
| 33 gfx::Vector2dF InterpolateBetween(const gfx::Vector2dF& start, | |
| 34 const gfx::Vector2dF& end, | |
| 35 float interp) { | |
| 36 return start + gfx::ScaleVector2d(end - start, interp); | |
| 37 } | |
| 38 | |
| 39 } // namespace | |
| 40 | |
| 41 namespace cc { | |
| 42 | |
| 43 using base::TimeTicks; | |
| 44 using base::TimeDelta; | |
| 45 | |
| 46 scoped_ptr<PageScaleAnimation> PageScaleAnimation::Create( | |
| 47 const gfx::Vector2dF& start_scroll_offset, | |
| 48 float start_page_scale_factor, | |
| 49 const gfx::SizeF& viewport_size, | |
| 50 const gfx::SizeF& root_layer_size, | |
| 51 scoped_ptr<TimingFunction> timing_function) { | |
| 52 return make_scoped_ptr(new PageScaleAnimation(start_scroll_offset, | |
| 53 start_page_scale_factor, | |
| 54 viewport_size, | |
| 55 root_layer_size, | |
| 56 timing_function.Pass())); | |
| 57 } | |
| 58 | |
| 59 PageScaleAnimation::PageScaleAnimation( | |
| 60 const gfx::Vector2dF& start_scroll_offset, | |
| 61 float start_page_scale_factor, | |
| 62 const gfx::SizeF& viewport_size, | |
| 63 const gfx::SizeF& root_layer_size, | |
| 64 scoped_ptr<TimingFunction> timing_function) | |
| 65 : start_page_scale_factor_(start_page_scale_factor), | |
| 66 target_page_scale_factor_(0.f), | |
| 67 start_scroll_offset_(start_scroll_offset), | |
| 68 start_anchor_(), | |
| 69 target_anchor_(), | |
| 70 viewport_size_(viewport_size), | |
| 71 root_layer_size_(root_layer_size), | |
| 72 timing_function_(timing_function.Pass()) { | |
| 73 } | |
| 74 | |
| 75 PageScaleAnimation::~PageScaleAnimation() {} | |
| 76 | |
| 77 void PageScaleAnimation::ZoomTo(const gfx::Vector2dF& target_scroll_offset, | |
| 78 float target_page_scale_factor, | |
| 79 double duration) { | |
| 80 target_page_scale_factor_ = target_page_scale_factor; | |
| 81 target_scroll_offset_ = target_scroll_offset; | |
| 82 ClampTargetScrollOffset(); | |
| 83 duration_ = TimeDelta::FromSecondsD(duration); | |
| 84 | |
| 85 if (start_page_scale_factor_ == target_page_scale_factor) { | |
| 86 start_anchor_ = start_scroll_offset_; | |
| 87 target_anchor_ = target_scroll_offset; | |
| 88 return; | |
| 89 } | |
| 90 | |
| 91 // For uniform-looking zooming, infer an anchor from the start and target | |
| 92 // viewport rects. | |
| 93 InferTargetAnchorFromScrollOffsets(); | |
| 94 start_anchor_ = target_anchor_; | |
| 95 } | |
| 96 | |
| 97 void PageScaleAnimation::ZoomWithAnchor(const gfx::Vector2dF& anchor, | |
| 98 float target_page_scale_factor, | |
| 99 double duration) { | |
| 100 start_anchor_ = anchor; | |
| 101 target_page_scale_factor_ = target_page_scale_factor; | |
| 102 duration_ = TimeDelta::FromSecondsD(duration); | |
| 103 | |
| 104 // We start zooming out from the anchor tapped by the user. But if | |
| 105 // the target scale is impossible to attain without hitting the root layer | |
| 106 // edges, then infer an anchor that doesn't collide with the edges. | |
| 107 // We will interpolate between the two anchors during the animation. | |
| 108 InferTargetScrollOffsetFromStartAnchor(); | |
| 109 ClampTargetScrollOffset(); | |
| 110 | |
| 111 if (start_page_scale_factor_ == target_page_scale_factor_) { | |
| 112 target_anchor_ = start_anchor_; | |
| 113 return; | |
| 114 } | |
| 115 InferTargetAnchorFromScrollOffsets(); | |
| 116 } | |
| 117 | |
| 118 void PageScaleAnimation::InferTargetScrollOffsetFromStartAnchor() { | |
| 119 gfx::Vector2dF normalized = NormalizeFromViewport( | |
| 120 start_anchor_ - start_scroll_offset_, StartViewportSize()); | |
| 121 target_scroll_offset_ = | |
| 122 start_anchor_ - DenormalizeToViewport(normalized, TargetViewportSize()); | |
| 123 } | |
| 124 | |
| 125 void PageScaleAnimation::InferTargetAnchorFromScrollOffsets() { | |
| 126 // The anchor is the point which is at the same normalized relative position | |
| 127 // within both start viewport rect and target viewport rect. For example, a | |
| 128 // zoom-in double-tap to a perfectly centered rect will have normalized | |
| 129 // anchor (0.5, 0.5), while one to a rect touching the bottom-right of the | |
| 130 // screen will have normalized anchor (1.0, 1.0). In other words, it obeys | |
| 131 // the equations: | |
| 132 // anchor = start_size * normalized + start_offset | |
| 133 // anchor = target_size * normalized + target_offset | |
| 134 // where both anchor and normalized begin as unknowns. Solving | |
| 135 // for the normalized, we get the following: | |
| 136 float width_scale = | |
| 137 1.f / (TargetViewportSize().width() - StartViewportSize().width()); | |
| 138 float height_scale = | |
| 139 1.f / (TargetViewportSize().height() - StartViewportSize().height()); | |
| 140 gfx::Vector2dF normalized = gfx::ScaleVector2d( | |
| 141 start_scroll_offset_ - target_scroll_offset_, width_scale, height_scale); | |
| 142 target_anchor_ = | |
| 143 target_scroll_offset_ + DenormalizeToViewport(normalized, | |
| 144 TargetViewportSize()); | |
| 145 } | |
| 146 | |
| 147 void PageScaleAnimation::ClampTargetScrollOffset() { | |
| 148 gfx::Vector2dF max_scroll_offset = | |
| 149 gfx::RectF(root_layer_size_).bottom_right() - | |
| 150 gfx::RectF(TargetViewportSize()).bottom_right(); | |
| 151 target_scroll_offset_.SetToMax(gfx::Vector2dF()); | |
| 152 target_scroll_offset_.SetToMin(max_scroll_offset); | |
| 153 } | |
| 154 | |
| 155 gfx::SizeF PageScaleAnimation::StartViewportSize() const { | |
| 156 return gfx::ScaleSize(viewport_size_, 1.f / start_page_scale_factor_); | |
| 157 } | |
| 158 | |
| 159 gfx::SizeF PageScaleAnimation::TargetViewportSize() const { | |
| 160 return gfx::ScaleSize(viewport_size_, 1.f / target_page_scale_factor_); | |
| 161 } | |
| 162 | |
| 163 gfx::SizeF PageScaleAnimation::ViewportSizeAt(float interp) const { | |
| 164 return gfx::ScaleSize(viewport_size_, 1.f / PageScaleFactorAt(interp)); | |
| 165 } | |
| 166 | |
| 167 bool PageScaleAnimation::IsAnimationStarted() const { | |
| 168 return start_time_ > base::TimeTicks(); | |
| 169 } | |
| 170 | |
| 171 void PageScaleAnimation::StartAnimation(base::TimeTicks time) { | |
| 172 DCHECK(start_time_.is_null()); | |
| 173 start_time_ = time; | |
| 174 } | |
| 175 | |
| 176 gfx::Vector2dF PageScaleAnimation::ScrollOffsetAtTime( | |
| 177 base::TimeTicks time) const { | |
| 178 DCHECK(!start_time_.is_null()); | |
| 179 return ScrollOffsetAt(InterpAtTime(time)); | |
| 180 } | |
| 181 | |
| 182 float PageScaleAnimation::PageScaleFactorAtTime(base::TimeTicks time) const { | |
| 183 DCHECK(!start_time_.is_null()); | |
| 184 return PageScaleFactorAt(InterpAtTime(time)); | |
| 185 } | |
| 186 | |
| 187 bool PageScaleAnimation::IsAnimationCompleteAtTime(base::TimeTicks time) const { | |
| 188 DCHECK(!start_time_.is_null()); | |
| 189 return time >= end_time(); | |
| 190 } | |
| 191 | |
| 192 float PageScaleAnimation::InterpAtTime(base::TimeTicks monotonic_time) const { | |
| 193 DCHECK(!start_time_.is_null()); | |
| 194 DCHECK(monotonic_time >= start_time_); | |
| 195 if (IsAnimationCompleteAtTime(monotonic_time)) | |
| 196 return 1.f; | |
| 197 const double normalized_time = | |
| 198 (monotonic_time - start_time_).InSecondsF() / duration_.InSecondsF(); | |
| 199 return timing_function_->GetValue(normalized_time); | |
| 200 } | |
| 201 | |
| 202 gfx::Vector2dF PageScaleAnimation::ScrollOffsetAt(float interp) const { | |
| 203 if (interp <= 0.f) | |
| 204 return start_scroll_offset_; | |
| 205 if (interp >= 1.f) | |
| 206 return target_scroll_offset_; | |
| 207 | |
| 208 return AnchorAt(interp) - ViewportRelativeAnchorAt(interp); | |
| 209 } | |
| 210 | |
| 211 gfx::Vector2dF PageScaleAnimation::AnchorAt(float interp) const { | |
| 212 // Interpolate from start to target anchor in absolute space. | |
| 213 return InterpolateBetween(start_anchor_, target_anchor_, interp); | |
| 214 } | |
| 215 | |
| 216 gfx::Vector2dF PageScaleAnimation::ViewportRelativeAnchorAt( | |
| 217 float interp) const { | |
| 218 // Interpolate from start to target anchor in normalized space. | |
| 219 gfx::Vector2dF start_normalized = | |
| 220 NormalizeFromViewport(start_anchor_ - start_scroll_offset_, | |
| 221 StartViewportSize()); | |
| 222 gfx::Vector2dF target_normalized = | |
| 223 NormalizeFromViewport(target_anchor_ - target_scroll_offset_, | |
| 224 TargetViewportSize()); | |
| 225 gfx::Vector2dF interp_normalized = | |
| 226 InterpolateBetween(start_normalized, target_normalized, interp); | |
| 227 | |
| 228 return DenormalizeToViewport(interp_normalized, ViewportSizeAt(interp)); | |
| 229 } | |
| 230 | |
| 231 float PageScaleAnimation::PageScaleFactorAt(float interp) const { | |
| 232 if (interp <= 0.f) | |
| 233 return start_page_scale_factor_; | |
| 234 if (interp >= 1.f) | |
| 235 return target_page_scale_factor_; | |
| 236 | |
| 237 // Linearly interpolate the magnitude in log scale. | |
| 238 float diff = target_page_scale_factor_ / start_page_scale_factor_; | |
| 239 float log_diff = log(diff); | |
| 240 log_diff *= interp; | |
| 241 diff = exp(log_diff); | |
| 242 return start_page_scale_factor_ * diff; | |
| 243 } | |
| 244 | |
| 245 } // namespace cc | |
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Chromium Code Reviews
Issue 1057283003:
Remove parts of //cc we aren't using (Closed)
Base URL: git@github.com:domokit/mojo.git@master