1 /*
2 * Copyright (C) 2011 Apple Inc. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR
17 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
18 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
19 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
20 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
21 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
23 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26 #ifndef AnimationUtilities_h
27 #define AnimationUtilities_h
28
29 #include "platform/LayoutUnit.h"
30 #include "platform/PlatformExport.h"
31 #include "platform/geometry/IntPoint.h"
32 #include "wtf/MathExtras.h"
33 #include "wtf/TypeTraits.h"
34
35 namespace WebCore {
36
blend(int from,int to,double progress)37 inline int blend(int from, int to, double progress)
38 {
39 return lround(from + (to - from) * progress);
40 }
41
42 // For unsigned types.
43 template <typename T>
blend(T from,T to,double progress)44 inline T blend(T from, T to, double progress)
45 {
46 COMPILE_ASSERT(WTF::IsInteger<T>::value, BlendForUnsignedTypes);
47 return clampTo<T>(round(to > from ? from + (to - from) * progress : from - (from - to) * progress));
48 }
49
blend(double from,double to,double progress)50 inline double blend(double from, double to, double progress)
51 {
52 return from + (to - from) * progress;
53 }
54
blend(float from,float to,double progress)55 inline float blend(float from, float to, double progress)
56 {
57 return static_cast<float>(from + (to - from) * progress);
58 }
59
blend(LayoutUnit from,LayoutUnit to,double progress)60 inline LayoutUnit blend(LayoutUnit from, LayoutUnit to, double progress)
61 {
62 return from + (to - from) * progress;
63 }
64
blend(const IntPoint & from,const IntPoint & to,double progress)65 inline IntPoint blend(const IntPoint& from, const IntPoint& to, double progress)
66 {
67 return IntPoint(blend(from.x(), to.x(), progress), blend(from.y(), to.y(), progress));
68 }
69
70 // Calculates the accuracy for evaluating a timing function for an animation with the specified duration.
accuracyForDuration(double duration)71 inline double accuracyForDuration(double duration)
72 {
73 return 1.0 / (200.0 * duration);
74 }
75
76 } // namespace WebCore
77
78 #endif // AnimationUtilities_h
79