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1 // Copyright (c) 2016 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 CC_BASE_SCALE_TRANSLATE2D_H_ | |
6 #define CC_BASE_SCALE_TRANSLATE2D_H_ | |
7 | |
8 #include "ui/gfx/geometry/rect_f.h" | |
9 #include "ui/gfx/geometry/vector2d_f.h" | |
10 | |
11 class SkCanvas; | |
12 | |
13 namespace cc { | |
14 | |
15 class ScaleTranslate2d { | |
enne (OOO)
2016/08/29 20:21:18
There are a lot of functions here. Which of these
| |
16 public: | |
17 constexpr ScaleTranslate2d() : pre_scale_(0.f) {} | |
18 constexpr ScaleTranslate2d(float pre_scale, const gfx::Vector2dF& translation) | |
19 : pre_scale_(pre_scale), translation_(translation) {} | |
20 | |
21 bool operator==(const ScaleTranslate2d& other) const { | |
22 return pre_scale_ == other.pre_scale_ && translation_ == other.translation_; | |
23 } | |
24 bool operator!=(const ScaleTranslate2d& other) const { | |
25 return !(*this == other); | |
26 } | |
27 | |
28 static ScaleTranslate2d PreScale(const ScaleTranslate2d& t, float scale) { | |
29 return ScaleTranslate2d(t.pre_scale_ * scale, t.translation_); | |
30 } | |
31 void PreScale(float scale) { *this = PreScale(*this, scale); } | |
32 | |
33 static ScaleTranslate2d PostScale(const ScaleTranslate2d& t, float scale) { | |
34 return ScaleTranslate2d(t.pre_scale_ * scale, | |
35 gfx::ScaleVector2d(t.translation_, scale)); | |
36 } | |
37 void PostScale(float scale) { *this = PostScale(*this, scale); } | |
38 | |
39 static ScaleTranslate2d PreTranslate(const ScaleTranslate2d& t, | |
40 const gfx::Vector2dF& translation) { | |
41 return ScaleTranslate2d( | |
42 t.pre_scale_, | |
43 gfx::ScaleVector2d(translation, t.pre_scale_) + t.translation_); | |
44 } | |
45 void PreTranslate(const gfx::Vector2dF& translation) { | |
46 *this = PreTranslate(*this, translation); | |
47 } | |
48 | |
49 static ScaleTranslate2d PostTranslate(const ScaleTranslate2d& t, | |
50 const gfx::Vector2dF& translation) { | |
51 return ScaleTranslate2d(t.pre_scale_, t.translation_ + translation); | |
52 } | |
53 void PostTranslate(const gfx::Vector2dF& translation) { | |
54 *this = PostTranslate(*this, translation); | |
55 } | |
56 | |
57 static ScaleTranslate2d Concat(const ScaleTranslate2d& post, | |
58 const ScaleTranslate2d& pre) { | |
59 return ScaleTranslate2d( | |
60 pre.pre_scale_ * post.pre_scale_, | |
61 gfx::ScaleVector2d(pre.translation_, post.pre_scale_) + | |
62 post.translation_); | |
63 } | |
64 void PreConcat(const ScaleTranslate2d& other) { | |
65 *this = Concat(*this, other); | |
66 } | |
67 void PostConcat(const ScaleTranslate2d& other) { | |
68 *this = Concat(other, *this); | |
69 } | |
70 | |
71 static ScaleTranslate2d Inverse(const ScaleTranslate2d& t) { | |
72 return ScaleTranslate2d( | |
73 1.f / t.pre_scale_, | |
74 gfx::ScaleVector2d(-t.translation_, 1.f / t.pre_scale_)); | |
75 } | |
76 void Invert() { *this = Inverse(*this); } | |
77 | |
78 gfx::PointF Transform(const gfx::PointF& p) const { | |
79 return gfx::ScalePoint(p, pre_scale_) + translation_; | |
80 } | |
81 gfx::PointF TransformReverse(const gfx::PointF& p) const { | |
82 return gfx::ScalePoint(p - translation_, 1.f / pre_scale_); | |
83 } | |
84 | |
85 gfx::RectF Transform(const gfx::RectF& r) const { | |
enne (OOO)
2016/08/29 20:21:18
Would it make sense to make these functions match
| |
86 return gfx::ScaleRect(r, pre_scale_) + translation_; | |
87 } | |
88 gfx::RectF TransformReverse(const gfx::RectF& r) const { | |
89 return gfx::ScaleRect(r - translation_, 1.f / pre_scale_); | |
90 } | |
91 | |
92 void ApplyToCanvas(SkCanvas* canvas) const; | |
93 | |
94 float pre_scale() const { return pre_scale_; } | |
95 gfx::Vector2dF translation() const { return translation_; } | |
96 | |
97 private: | |
98 float pre_scale_; | |
enne (OOO)
2016/08/29 20:21:18
bikeshed: I'd just call this "scale" with comments
| |
99 gfx::Vector2dF translation_; | |
100 }; | |
101 | |
102 } // namespace cc | |
103 | |
104 #endif // CC_BASE_SCALE_TRANSLATE2D_H_ | |
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