1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
|
// Copyright 2018 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 "ui/gfx/skia_vector_animation.h"
#include "base/trace_event/trace_event.h"
#include "cc/paint/skottie_wrapper.h"
#include "third_party/skia/include/core/SkBitmap.h"
#include "third_party/skia/include/core/SkCanvas.h"
#include "third_party/skia/include/core/SkImage.h"
#include "ui/gfx/canvas.h"
#include "ui/gfx/geometry/size_conversions.h"
#include "ui/gfx/image/image_skia.h"
#include "ui/gfx/skia_util.h"
#include "ui/gfx/skia_vector_animation_observer.h"
namespace gfx {
SkiaVectorAnimation::TimerControl::TimerControl(
const base::TimeDelta& offset,
const base::TimeDelta& cycle_duration,
const base::TimeDelta& total_duration,
const base::TimeTicks& start_timestamp,
bool should_reverse)
: start_offset_(offset),
end_offset_((offset + cycle_duration)),
cycle_duration_(end_offset_ - start_offset_),
progress_per_millisecond_(1.0 / total_duration.InMillisecondsF()),
previous_tick_(start_timestamp),
progress_(base::TimeDelta::FromMilliseconds(0)),
current_cycle_progress_(start_offset_),
should_reverse_(should_reverse) {}
void SkiaVectorAnimation::TimerControl::Step(const base::TimeTicks& timestamp) {
progress_ += timestamp - previous_tick_;
previous_tick_ = timestamp;
base::TimeDelta completed_cycles_duration =
completed_cycles_ * cycle_duration_;
if (progress_ >= completed_cycles_duration + cycle_duration_) {
completed_cycles_++;
completed_cycles_duration += cycle_duration_;
}
current_cycle_progress_ =
start_offset_ + progress_ - completed_cycles_duration;
if (should_reverse_ && completed_cycles_ % 2) {
current_cycle_progress_ =
end_offset_ - (current_cycle_progress_ - start_offset_);
}
}
void SkiaVectorAnimation::TimerControl::Resume(
const base::TimeTicks& timestamp) {
previous_tick_ = timestamp;
}
double SkiaVectorAnimation::TimerControl::GetNormalizedCurrentCycleProgress()
const {
return current_cycle_progress_.InMillisecondsF() * progress_per_millisecond_;
}
double SkiaVectorAnimation::TimerControl::GetNormalizedStartOffset() const {
return start_offset_.InMillisecondsF() * progress_per_millisecond_;
}
double SkiaVectorAnimation::TimerControl::GetNormalizedEndOffset() const {
return end_offset_.InMillisecondsF() * progress_per_millisecond_;
}
SkiaVectorAnimation::SkiaVectorAnimation(
scoped_refptr<cc::SkottieWrapper> skottie)
: skottie_(skottie) {}
SkiaVectorAnimation::~SkiaVectorAnimation() {}
void SkiaVectorAnimation::SetAnimationObserver(
SkiaVectorAnimationObserver* observer) {
DCHECK(!observer_ || !observer);
observer_ = observer;
}
base::TimeDelta SkiaVectorAnimation::GetAnimationDuration() const {
return base::TimeDelta::FromMilliseconds(
std::floor(SkScalarToFloat(skottie_->duration()) * 1000.f));
}
gfx::Size SkiaVectorAnimation::GetOriginalSize() const {
#if DCHECK_IS_ON()
// The size should have no fractional component.
gfx::SizeF float_size = gfx::SkSizeToSizeF(skottie_->size());
gfx::Size rounded_size = gfx::ToRoundedSize(float_size);
float height_diff = std::abs(float_size.height() - rounded_size.height());
float width_diff = std::abs(float_size.width() - rounded_size.width());
DCHECK_LE(height_diff, std::numeric_limits<float>::epsilon());
DCHECK_LE(width_diff, std::numeric_limits<float>::epsilon());
#endif
return gfx::ToRoundedSize(gfx::SkSizeToSizeF(skottie_->size()));
}
void SkiaVectorAnimation::Start(Style style) {
DCHECK_NE(state_, PlayState::kPaused);
DCHECK_NE(state_, PlayState::kPlaying);
StartSubsection(base::TimeDelta(), GetAnimationDuration(), style);
}
void SkiaVectorAnimation::StartSubsection(base::TimeDelta start_offset,
base::TimeDelta duration,
Style style) {
DCHECK(state_ == PlayState::kStopped || state_ == PlayState::kEnded);
DCHECK_LE(start_offset + duration, GetAnimationDuration());
style_ = style;
// Reset the |timer_control_| object for a new animation play.
timer_control_.reset(nullptr);
// Schedule a play for the animation and store the necessary information
// needed to start playing.
state_ = PlayState::kSchedulePlay;
scheduled_start_offset_ = start_offset;
scheduled_duration_ = duration;
}
void SkiaVectorAnimation::Pause() {
DCHECK(state_ == PlayState::kPlaying || state_ == PlayState::kSchedulePlay);
state_ = PlayState::kPaused;
}
void SkiaVectorAnimation::ResumePlaying() {
DCHECK(state_ == PlayState::kPaused);
state_ = PlayState::kScheduleResume;
}
void SkiaVectorAnimation::Stop() {
state_ = PlayState::kStopped;
timer_control_.reset(nullptr);
}
float SkiaVectorAnimation::GetCurrentProgress() const {
switch (state_) {
case PlayState::kStopped:
return 0;
case PlayState::kEnded:
DCHECK(timer_control_);
return timer_control_->GetNormalizedEndOffset();
case PlayState::kPaused:
if (timer_control_) {
return timer_control_->GetNormalizedCurrentCycleProgress();
} else {
// It may be that the timer hasn't been initialized which may happen if
// the animation was paused while it was in |kScheculePlay| state.
return scheduled_start_offset_.InMillisecondsF() / skottie_->duration();
}
case PlayState::kSchedulePlay:
case PlayState::kPlaying:
case PlayState::kScheduleResume:
// The timer control needs to be initialized before making this call. It
// may not have been initialized if OnAnimationStep has not been called
// yet
DCHECK(timer_control_);
return timer_control_->GetNormalizedCurrentCycleProgress();
}
}
void SkiaVectorAnimation::Paint(gfx::Canvas* canvas,
const base::TimeTicks& timestamp,
const gfx::Size& size) {
switch (state_) {
case PlayState::kStopped:
return;
case PlayState::kSchedulePlay:
InitTimer(timestamp);
state_ = PlayState::kPlaying;
if (observer_)
observer_->AnimationWillStartPlaying(this);
break;
case PlayState::kPlaying:
UpdateState(timestamp);
break;
case PlayState::kPaused:
break;
case PlayState::kScheduleResume:
state_ = PlayState::kPlaying;
if (timer_control_) {
timer_control_->Resume(timestamp);
} else {
// The animation may have been paused after a play was scheduled but
// before it started playing.
InitTimer(timestamp);
}
if (observer_)
observer_->AnimationResuming(this);
break;
case PlayState::kEnded:
break;
}
PaintFrame(canvas, GetCurrentProgress(), size);
}
void SkiaVectorAnimation::PaintFrame(gfx::Canvas* canvas,
float t,
const gfx::Size& size) {
DCHECK_GE(t, 0.f);
DCHECK_LE(t, 1.f);
canvas->DrawSkottie(skottie(), gfx::Rect(size), t);
}
void SkiaVectorAnimation::InitTimer(const base::TimeTicks& timestamp) {
DCHECK(!timer_control_);
timer_control_ = std::make_unique<TimerControl>(
scheduled_start_offset_, scheduled_duration_, GetAnimationDuration(),
timestamp, style_ == Style::kThrobbing);
}
void SkiaVectorAnimation::UpdateState(const base::TimeTicks& timestamp) {
DCHECK(timer_control_);
int cycles = timer_control_->completed_cycles();
timer_control_->Step(timestamp);
if (cycles == timer_control_->completed_cycles())
return;
bool inform_observer = true;
switch (style_) {
case Style::kLoop:
break;
case Style::kThrobbing:
// For a throbbing animation, the animation cycle ends when the timer
// goes from 0 to 1 and then back to 0. So the number of timer cycles
// must be even at the end of one throbbing animation cycle.
if (timer_control_->completed_cycles() % 2 != 0)
inform_observer = false;
break;
case Style::kLinear:
state_ = PlayState::kEnded;
break;
}
// Inform observer if the cycle has ended.
if (observer_ && inform_observer) {
observer_->AnimationCycleEnded(this);
}
}
} // namespace gfx
|
