1 // Copyright 2018 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 #ifndef THIRD_PARTY_BLINK_RENDERER_PLATFORM_GEOMETRY_BLEND_H_
6 #define THIRD_PARTY_BLINK_RENDERER_PLATFORM_GEOMETRY_BLEND_H_
7
8 #include "third_party/blink/renderer/platform/geometry/float_point.h"
9 #include "third_party/blink/renderer/platform/geometry/int_point.h"
10 #include "third_party/blink/renderer/platform/geometry/layout_unit.h"
11 #include "third_party/blink/renderer/platform/platform_export.h"
12 #include "third_party/blink/renderer/platform/wtf/math_extras.h"
13
14 #include <type_traits>
15
16 namespace blink {
17
Blend(int from,int to,double progress)18 inline int Blend(int from, int to, double progress) {
19 return static_cast<int>(lround(from + (to - from) * progress));
20 }
21
22 // For unsigned types.
23 template <typename T>
Blend(T from,T to,double progress)24 inline T Blend(T from, T to, double progress) {
25 static_assert(std::is_integral<T>::value,
26 "blend can only be used with integer types");
27 return clampTo<T>(round(to > from ? from + (to - from) * progress
28 : from - (from - to) * progress));
29 }
30
Blend(double from,double to,double progress)31 inline double Blend(double from, double to, double progress) {
32 return from + (to - from) * progress;
33 }
34
Blend(float from,float to,double progress)35 inline float Blend(float from, float to, double progress) {
36 return static_cast<float>(from + (to - from) * progress);
37 }
38
Blend(LayoutUnit from,LayoutUnit to,double progress)39 inline LayoutUnit Blend(LayoutUnit from, LayoutUnit to, double progress) {
40 return LayoutUnit(from + (to - from) * progress);
41 }
42
Blend(const IntPoint & from,const IntPoint & to,double progress)43 inline IntPoint Blend(const IntPoint& from,
44 const IntPoint& to,
45 double progress) {
46 return IntPoint(Blend(from.X(), to.X(), progress),
47 Blend(from.Y(), to.Y(), progress));
48 }
49
Blend(const FloatPoint & from,const FloatPoint & to,double progress)50 inline FloatPoint Blend(const FloatPoint& from,
51 const FloatPoint& to,
52 double progress) {
53 return FloatPoint(Blend(from.X(), to.X(), progress),
54 Blend(from.Y(), to.Y(), progress));
55 }
56
57 } // namespace blink
58
59 #endif // THIRD_PARTY_BLINK_RENDERER_PLATFORM_GEOMETRY_BLEND_H_
60