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1 /* | |
2 * Copyright (C) 2000 Lars Knoll (knoll@kde.org) | |
3 * (C) 2000 Antti Koivisto (koivisto@kde.org) | |
4 * (C) 2000 Dirk Mueller (mueller@kde.org) | |
5 * Copyright (C) 2003, 2005, 2006, 2007, 2008 Apple Inc. All rights reserved. | |
6 * Copyright (C) 2006 Graham Dennis (graham.dennis@gmail.com) | |
7 * | |
8 * This library is free software; you can redistribute it and/or | |
9 * modify it under the terms of the GNU Library General Public | |
10 * License as published by the Free Software Foundation; either | |
11 * version 2 of the License, or (at your option) any later version. | |
12 * | |
13 * This library is distributed in the hope that it will be useful, | |
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
16 * Library General Public License for more details. | |
17 * | |
18 * You should have received a copy of the GNU Library General Public License | |
19 * along with this library; see the file COPYING.LIB. If not, write to | |
20 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, | |
21 * Boston, MA 02110-1301, USA. | |
22 * | |
23 */ | |
24 | |
25 #ifndef TimingFunction_h | |
26 #define TimingFunction_h | |
27 | |
28 #include "RuntimeEnabledFeatures.h" | |
29 #include "platform/animation/AnimationUtilities.h" // For blend() | |
30 #include "platform/animation/UnitBezier.h" | |
31 #include "wtf/OwnPtr.h" | |
32 #include "wtf/PassOwnPtr.h" | |
33 #include "wtf/PassRefPtr.h" | |
34 #include "wtf/RefCounted.h" | |
35 #include "wtf/StdLibExtras.h" | |
36 #include "wtf/Vector.h" | |
37 #include <algorithm> | |
38 | |
39 | |
40 namespace WebCore { | |
41 | |
42 class TimingFunction : public RefCounted<TimingFunction> { | |
43 public: | |
44 | |
45 enum Type { | |
46 LinearFunction, CubicBezierFunction, StepsFunction, ChainedFunction | |
47 }; | |
48 | |
49 virtual ~TimingFunction() { } | |
50 | |
51 Type type() const { return m_type; } | |
52 | |
53 // Evaluates the timing function at the given fraction. The accuracy paramet
er provides a hint as to the required | |
54 // accuracy and is not guaranteed. | |
55 virtual double evaluate(double fraction, double accuracy) const = 0; | |
56 | |
57 protected: | |
58 TimingFunction(Type type) | |
59 : m_type(type) | |
60 { | |
61 } | |
62 | |
63 private: | |
64 Type m_type; | |
65 }; | |
66 | |
67 class LinearTimingFunction : public TimingFunction { | |
68 public: | |
69 static PassRefPtr<LinearTimingFunction> create() | |
70 { | |
71 return adoptRef(new LinearTimingFunction); | |
72 } | |
73 | |
74 ~LinearTimingFunction() { } | |
75 | |
76 virtual double evaluate(double fraction, double) const | |
77 { | |
78 ASSERT(RuntimeEnabledFeatures::webAnimationsCSSEnabled() || (fraction >=
0 && fraction <= 1)); | |
79 ASSERT_WITH_MESSAGE(!RuntimeEnabledFeatures::webAnimationsCSSEnabled() |
| (fraction >= 0 && fraction <= 1), "Web Animations not yet implemented: Timing
function behavior outside the range [0, 1] is not yet specified"); | |
80 return fraction; | |
81 } | |
82 | |
83 private: | |
84 LinearTimingFunction() | |
85 : TimingFunction(LinearFunction) | |
86 { | |
87 } | |
88 }; | |
89 | |
90 | |
91 // Forward declare so we can friend it below. Don't use in production code! | |
92 class ChainedTimingFunctionTestHelper; | |
93 | |
94 class CubicBezierTimingFunction : public TimingFunction { | |
95 public: | |
96 enum SubType { | |
97 Ease, | |
98 EaseIn, | |
99 EaseOut, | |
100 EaseInOut, | |
101 Custom | |
102 }; | |
103 | |
104 static PassRefPtr<CubicBezierTimingFunction> create(double x1, double y1, do
uble x2, double y2) | |
105 { | |
106 return adoptRef(new CubicBezierTimingFunction(Custom, x1, y1, x2, y2)); | |
107 } | |
108 | |
109 static CubicBezierTimingFunction* preset(SubType subType) | |
110 { | |
111 switch (subType) { | |
112 case Ease: | |
113 { | |
114 DEFINE_STATIC_REF(CubicBezierTimingFunction, ease, (adoptRef(new
CubicBezierTimingFunction(Ease, 0.25, 0.1, 0.25, 1.0)))); | |
115 return ease; | |
116 } | |
117 case EaseIn: | |
118 { | |
119 DEFINE_STATIC_REF(CubicBezierTimingFunction, easeIn, (adoptRef(n
ew CubicBezierTimingFunction(EaseIn, 0.42, 0.0, 1.0, 1.0)))); | |
120 return easeIn; | |
121 } | |
122 case EaseOut: | |
123 { | |
124 DEFINE_STATIC_REF(CubicBezierTimingFunction, easeOut, (adoptRef(
new CubicBezierTimingFunction(EaseOut, 0.0, 0.0, 0.58, 1.0)))); | |
125 return easeOut; | |
126 } | |
127 case EaseInOut: | |
128 { | |
129 DEFINE_STATIC_REF(CubicBezierTimingFunction, easeInOut, (adoptRe
f(new CubicBezierTimingFunction(EaseInOut, 0.42, 0.0, 0.58, 1.0)))); | |
130 return easeInOut; | |
131 } | |
132 default: | |
133 ASSERT_NOT_REACHED(); | |
134 return 0; | |
135 } | |
136 } | |
137 | |
138 ~CubicBezierTimingFunction() { } | |
139 | |
140 virtual double evaluate(double fraction, double accuracy) const | |
141 { | |
142 ASSERT(RuntimeEnabledFeatures::webAnimationsCSSEnabled() || (fraction >=
0 && fraction <= 1)); | |
143 ASSERT_WITH_MESSAGE(!RuntimeEnabledFeatures::webAnimationsCSSEnabled() |
| (fraction >= 0 && fraction <= 1), "Web Animations not yet implemented: Timing
function behavior outside the range [0, 1] is not yet specified"); | |
144 if (!m_bezier) | |
145 m_bezier = adoptPtr(new UnitBezier(m_x1, m_y1, m_x2, m_y2)); | |
146 return m_bezier->solve(fraction, accuracy); | |
147 } | |
148 | |
149 double x1() const { return m_x1; } | |
150 double y1() const { return m_y1; } | |
151 double x2() const { return m_x2; } | |
152 double y2() const { return m_y2; } | |
153 | |
154 SubType subType() const { return m_subType; } | |
155 | |
156 private: | |
157 explicit CubicBezierTimingFunction(SubType subType, double x1, double y1, do
uble x2, double y2) | |
158 : TimingFunction(CubicBezierFunction) | |
159 , m_x1(x1) | |
160 , m_y1(y1) | |
161 , m_x2(x2) | |
162 , m_y2(y2) | |
163 , m_subType(subType) | |
164 { | |
165 } | |
166 | |
167 double m_x1; | |
168 double m_y1; | |
169 double m_x2; | |
170 double m_y2; | |
171 SubType m_subType; | |
172 mutable OwnPtr<UnitBezier> m_bezier; | |
173 }; | |
174 | |
175 class StepsTimingFunction : public TimingFunction { | |
176 public: | |
177 enum SubType { | |
178 Start, | |
179 End, | |
180 Custom | |
181 }; | |
182 | |
183 static PassRefPtr<StepsTimingFunction> create(int steps, bool stepAtStart) | |
184 { | |
185 return adoptRef(new StepsTimingFunction(Custom, steps, stepAtStart)); | |
186 } | |
187 | |
188 static StepsTimingFunction* preset(SubType subType) | |
189 { | |
190 switch (subType) { | |
191 case Start: | |
192 { | |
193 DEFINE_STATIC_REF(StepsTimingFunction, start, (adoptRef(new Step
sTimingFunction(Start, 1, true)))); | |
194 return start; | |
195 } | |
196 case End: | |
197 { | |
198 DEFINE_STATIC_REF(StepsTimingFunction, end, (adoptRef(new StepsT
imingFunction(End, 1, false)))); | |
199 return end; | |
200 } | |
201 default: | |
202 ASSERT_NOT_REACHED(); | |
203 return 0; | |
204 } | |
205 } | |
206 | |
207 | |
208 ~StepsTimingFunction() { } | |
209 | |
210 virtual double evaluate(double fraction, double) const | |
211 { | |
212 ASSERT(RuntimeEnabledFeatures::webAnimationsCSSEnabled() || (fraction >=
0 && fraction <= 1)); | |
213 ASSERT_WITH_MESSAGE(!RuntimeEnabledFeatures::webAnimationsCSSEnabled() |
| (fraction >= 0 && fraction <= 1), "Web Animations not yet implemented: Timing
function behavior outside the range [0, 1] is not yet specified"); | |
214 return std::min(1.0, (floor(m_steps * fraction) + m_stepAtStart) / m_ste
ps); | |
215 } | |
216 | |
217 int numberOfSteps() const { return m_steps; } | |
218 bool stepAtStart() const { return m_stepAtStart; } | |
219 | |
220 SubType subType() const { return m_subType; } | |
221 | |
222 private: | |
223 StepsTimingFunction(SubType subType, int steps, bool stepAtStart) | |
224 : TimingFunction(StepsFunction) | |
225 , m_steps(steps) | |
226 , m_stepAtStart(stepAtStart) | |
227 , m_subType(subType) | |
228 { | |
229 } | |
230 | |
231 int m_steps; | |
232 bool m_stepAtStart; | |
233 SubType m_subType; | |
234 }; | |
235 | |
236 class ChainedTimingFunction : public TimingFunction { | |
237 public: | |
238 static PassRefPtr<ChainedTimingFunction> create() | |
239 { | |
240 return adoptRef(new ChainedTimingFunction); | |
241 } | |
242 | |
243 void appendSegment(double upperBound, TimingFunction* timingFunction) | |
244 { | |
245 double max = m_segments.isEmpty() ? 0 : m_segments.last().max(); | |
246 ASSERT(upperBound > max); | |
247 m_segments.append(Segment(max, upperBound, timingFunction)); | |
248 } | |
249 virtual double evaluate(double fraction, double accuracy) const | |
250 { | |
251 ASSERT_WITH_MESSAGE(fraction >= 0 && fraction <= 1, "Web Animations not
yet implemented: Timing function behavior outside the range [0, 1] is not yet sp
ecified"); | |
252 ASSERT(!m_segments.isEmpty()); | |
253 ASSERT(m_segments.last().max() == 1); | |
254 size_t i = 0; | |
255 const Segment* segment = &m_segments[i++]; | |
256 while (fraction >= segment->max() && i < m_segments.size()) { | |
257 segment = &m_segments[i++]; | |
258 } | |
259 return segment->evaluate(fraction, accuracy); | |
260 } | |
261 | |
262 private: | |
263 class Segment { | |
264 public: | |
265 Segment(double min, double max, TimingFunction* timingFunction) | |
266 : m_min(min) | |
267 , m_max(max) | |
268 , m_timingFunction(timingFunction) | |
269 { ASSERT(timingFunction); } | |
270 | |
271 double max() const { return m_max; } | |
272 double evaluate(double fraction, double accuracy) const | |
273 { | |
274 return scaleFromLocal(m_timingFunction->evaluate(scaleToLocal(fracti
on), accuracy)); | |
275 } | |
276 | |
277 private: | |
278 double scaleToLocal(double x) const { return (x - m_min) / (m_max - m_mi
n); } | |
279 double scaleFromLocal(double x) const { return blend(m_min, m_max, x); } | |
280 | |
281 double m_min; | |
282 double m_max; | |
283 RefPtr<TimingFunction> m_timingFunction; | |
284 | |
285 // FIXME: Come up with a public API for the segments and remove this. | |
286 friend class CompositorAnimationsImpl; | |
287 friend class CompositorAnimations; | |
288 | |
289 // Allow the compositor to reverse the timing function. | |
290 friend class CompositorAnimationsTimingFunctionReverser; | |
291 | |
292 // Allow PrintTo/operator== of the segments. Can be removed once | |
293 // ChainedTimingFunction has a public API for segments. | |
294 friend class ChainedTimingFunctionTestHelper; | |
295 }; | |
296 | |
297 ChainedTimingFunction() | |
298 : TimingFunction(ChainedFunction) | |
299 { | |
300 ASSERT(RuntimeEnabledFeatures::webAnimationsCSSEnabled()); | |
301 } | |
302 | |
303 Vector<Segment> m_segments; | |
304 | |
305 // FIXME: Come up with a public API for the segments and remove this. | |
306 friend class CompositorAnimationsImpl; | |
307 friend class CompositorAnimations; | |
308 | |
309 // Allow the compositor to reverse the timing function. | |
310 friend class CompositorAnimationsTimingFunctionReverser; | |
311 | |
312 // Allow PrintTo/operator== of the segments. Can be removed once | |
313 // ChainedTimingFunction has a public API for segments. | |
314 friend class ChainedTimingFunctionTestHelper; | |
315 }; | |
316 | |
317 #define DEFINE_TIMING_FUNCTION_TYPE_CASTS(typeName) \ | |
318 DEFINE_TYPE_CASTS( \ | |
319 typeName##TimingFunction, TimingFunction, value, \ | |
320 value->type() == TimingFunction::typeName##Function, \ | |
321 value.type() == TimingFunction::typeName##Function) | |
322 | |
323 DEFINE_TIMING_FUNCTION_TYPE_CASTS(Linear); | |
324 DEFINE_TIMING_FUNCTION_TYPE_CASTS(CubicBezier); | |
325 DEFINE_TIMING_FUNCTION_TYPE_CASTS(Steps); | |
326 DEFINE_TIMING_FUNCTION_TYPE_CASTS(Chained); | |
327 | |
328 } // namespace WebCore | |
329 | |
330 #endif // TimingFunction_h | |
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