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| 1 // Copyright (c) 2016 The Chromium Authors. All rights reserved. | 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 | 2 // Use of this source code is governed by a BSD-style license that can be |
| 3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
| 4 | 4 |
| 5 #ifndef CC_BASE_SCALE_TRANSLATE2D_H_ | 5 #ifndef CC_BASE_SCALE_TRANSLATE2D_H_ |
| 6 #define CC_BASE_SCALE_TRANSLATE2D_H_ | 6 #define CC_BASE_SCALE_TRANSLATE2D_H_ |
| 7 | 7 |
| 8 #include "ui/gfx/geometry/rect_f.h" | 8 #include "ui/gfx/geometry/rect_f.h" |
| 9 #include "ui/gfx/geometry/vector2d_f.h" | 9 #include "ui/gfx/geometry/vector2d_f.h" |
| 10 | 10 |
| 11 class SkCanvas; | 11 class SkCanvas; |
| 12 | 12 |
| 13 namespace cc { | 13 namespace cc { |
| 14 | 14 |
| 15 class ScaleTranslate2d { | 15 class ScaleTranslate2d { |
| 16 public: | 16 public: |
| 17 constexpr ScaleTranslate2d() : scale_(1.f) { } | 17 constexpr ScaleTranslate2d() : scale_(1.f) {} |
| 18 constexpr ScaleTranslate2d(float scale, const gfx::Vector2dF& translation) | 18 constexpr ScaleTranslate2d(float scale, const gfx::Vector2dF& translation) |
| 19 : scale_(scale), translation_(translation) {} | 19 : scale_(scale), translation_(translation) {} |
| 20 | 20 |
| 21 bool operator==(const ScaleTranslate2d& other) const { | 21 bool operator==(const ScaleTranslate2d& other) const { |
| 22 return scale_ == other.scale_ && translation_ == other.translation_; | 22 return scale_ == other.scale_ && translation_ == other.translation_; |
| 23 } | 23 } |
| 24 bool operator!=(const ScaleTranslate2d& other) const { | 24 bool operator!=(const ScaleTranslate2d& other) const { |
| 25 return !(*this == other); | 25 return !(*this == other); |
| 26 } | 26 } |
| 27 | 27 |
| 28 static ScaleTranslate2d PreScale(const ScaleTranslate2d& t, float scale) { | 28 static ScaleTranslate2d PreScale(const ScaleTranslate2d& t, float scale) { |
| 29 return ScaleTranslate2d(t.scale_ * scale, t.translation_); | 29 return ScaleTranslate2d(t.scale_ * scale, t.translation_); |
| 30 } | 30 } |
| 31 void PreScale(float scale) { *this = PreScale(*this, scale); } | 31 void PreScale(float scale) { *this = PreScale(*this, scale); } |
| 32 | 32 |
| 33 static ScaleTranslate2d PostScale(const ScaleTranslate2d& t, float scale) { | 33 static ScaleTranslate2d PostScale(const ScaleTranslate2d& t, float scale) { |
| 34 return ScaleTranslate2d(t.scale_ * scale, | 34 return ScaleTranslate2d(t.scale_ * scale, |
| 35 gfx::ScaleVector2d(t.translation_, scale)); | 35 gfx::ScaleVector2d(t.translation_, scale)); |
| 36 } | 36 } |
| 37 void PostScale(float scale) { *this = PostScale(*this, scale); } | 37 void PostScale(float scale) { *this = PostScale(*this, scale); } |
| 38 | 38 |
| 39 static ScaleTranslate2d PreTranslate(const ScaleTranslate2d& t, | 39 static ScaleTranslate2d PreTranslate(const ScaleTranslate2d& t, |
| 40 const gfx::Vector2dF& translation) { | 40 const gfx::Vector2dF& translation) { |
| 41 return ScaleTranslate2d( | 41 return ScaleTranslate2d( |
| 42 t.scale_, | 42 t.scale_, gfx::ScaleVector2d(translation, t.scale_) + t.translation_); |
| 43 gfx::ScaleVector2d(translation, t.scale_) + t.translation_); | |
| 44 } | 43 } |
| 45 void PreTranslate(const gfx::Vector2dF& translation) { | 44 void PreTranslate(const gfx::Vector2dF& translation) { |
| 46 *this = PreTranslate(*this, translation); | 45 *this = PreTranslate(*this, translation); |
| 47 } | 46 } |
| 48 | 47 |
| 49 static ScaleTranslate2d PostTranslate(const ScaleTranslate2d& t, | 48 static ScaleTranslate2d PostTranslate(const ScaleTranslate2d& t, |
| 50 const gfx::Vector2dF& translation) { | 49 const gfx::Vector2dF& translation) { |
| 51 return ScaleTranslate2d(t.scale_, t.translation_ + translation); | 50 return ScaleTranslate2d(t.scale_, t.translation_ + translation); |
| 52 } | 51 } |
| 53 void PostTranslate(const gfx::Vector2dF& translation) { | 52 void PostTranslate(const gfx::Vector2dF& translation) { |
| 54 *this = PostTranslate(*this, translation); | 53 *this = PostTranslate(*this, translation); |
| 55 } | 54 } |
| 56 | 55 |
| 57 static ScaleTranslate2d Concat(const ScaleTranslate2d& post, | 56 static ScaleTranslate2d Concat(const ScaleTranslate2d& post, |
| 58 const ScaleTranslate2d& pre) { | 57 const ScaleTranslate2d& pre) { |
| 59 return ScaleTranslate2d( | 58 return ScaleTranslate2d( |
| 60 pre.scale_ * post.scale_, | 59 pre.scale_ * post.scale_, |
| 61 gfx::ScaleVector2d(pre.translation_, post.scale_) + | 60 gfx::ScaleVector2d(pre.translation_, post.scale_) + post.translation_); |
| 62 post.translation_); | |
| 63 } | 61 } |
| 64 void PreConcat(const ScaleTranslate2d& other) { | 62 void PreConcat(const ScaleTranslate2d& other) { |
| 65 *this = Concat(*this, other); | 63 *this = Concat(*this, other); |
| 66 } | 64 } |
| 67 void PostConcat(const ScaleTranslate2d& other) { | 65 void PostConcat(const ScaleTranslate2d& other) { |
| 68 *this = Concat(other, *this); | 66 *this = Concat(other, *this); |
| 69 } | 67 } |
| 70 | 68 |
| 71 static ScaleTranslate2d Inverse(const ScaleTranslate2d& t) { | 69 static ScaleTranslate2d Inverse(const ScaleTranslate2d& t) { |
| 72 return ScaleTranslate2d( | 70 return ScaleTranslate2d(1 / t.scale_, |
| 73 1 / t.scale_, | 71 gfx::ScaleVector2d(-t.translation_, 1 / t.scale_)); |
| 74 gfx::ScaleVector2d(-t.translation_, 1 / t.scale_)); | |
| 75 } | 72 } |
| 76 void Invert() { *this = Inverse(*this); } | 73 void Invert() { *this = Inverse(*this); } |
| 77 | 74 |
| 78 gfx::PointF TransformPoint(const gfx::PointF& p) const { | 75 gfx::PointF TransformPoint(const gfx::PointF& p) const { |
| 79 return gfx::ScalePoint(p, scale_) + translation_; | 76 return gfx::ScalePoint(p, scale_) + translation_; |
| 80 } | 77 } |
| 81 gfx::PointF TransformPointReverse(const gfx::PointF& p) const { | 78 gfx::PointF TransformPointReverse(const gfx::PointF& p) const { |
| 82 return gfx::ScalePoint(p - translation_, 1.f / scale_); | 79 return gfx::ScalePoint(p - translation_, 1.f / scale_); |
| 83 } | 80 } |
| 84 | 81 |
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| 99 private: | 96 private: |
| 100 // Scale is applied before translation, i.e. | 97 // Scale is applied before translation, i.e. |
| 101 // this->Transform(p) == scale_ * p + translation_ | 98 // this->Transform(p) == scale_ * p + translation_ |
| 102 float scale_; | 99 float scale_; |
| 103 gfx::Vector2dF translation_; | 100 gfx::Vector2dF translation_; |
| 104 }; | 101 }; |
| 105 | 102 |
| 106 } // namespace cc | 103 } // namespace cc |
| 107 | 104 |
| 108 #endif // CC_BASE_SCALE_TRANSLATE2D_H_ | 105 #endif // CC_BASE_SCALE_TRANSLATE2D_H_ |
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