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1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. | 1 // Copyright (c) 2012 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 UI_GFX_SHADOW_VALUE_H_ | 5 #ifndef UI_GFX_SHADOW_VALUE_H_ |
6 #define UI_GFX_SHADOW_VALUE_H_ | 6 #define UI_GFX_SHADOW_VALUE_H_ |
7 | 7 |
8 #include <string> | 8 #include <string> |
9 #include <vector> | 9 #include <vector> |
10 | 10 |
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41 // are negative because shadow margins are outside a boundary. | 41 // are negative because shadow margins are outside a boundary. |
42 static Insets GetMargin(const ShadowValues& shadows); | 42 static Insets GetMargin(const ShadowValues& shadows); |
43 | 43 |
44 // Gets the area inside a rectangle that would be affected by shadow blur. | 44 // Gets the area inside a rectangle that would be affected by shadow blur. |
45 // This is similar to the margin except it's positive (the blur region is | 45 // This is similar to the margin except it's positive (the blur region is |
46 // inside a hypothetical rectangle) and it accounts for the blur both inside | 46 // inside a hypothetical rectangle) and it accounts for the blur both inside |
47 // and outside the bounding box. The region inside the "blur region" would be | 47 // and outside the bounding box. The region inside the "blur region" would be |
48 // a uniform color. | 48 // a uniform color. |
49 static Insets GetBlurRegion(const ShadowValues& shadows); | 49 static Insets GetBlurRegion(const ShadowValues& shadows); |
50 | 50 |
| 51 // Makes ShadowValues that should match MD style shadows for the given |
| 52 // elevation. |
| 53 static ShadowValues MakeMdShadowValues(int elevation); |
| 54 |
51 private: | 55 private: |
52 gfx::Vector2d offset_; | 56 gfx::Vector2d offset_; |
53 | 57 |
54 // Blur amount of the shadow in pixels. If underlying implementation supports | 58 // Blur amount of the shadow in pixels. If underlying implementation supports |
55 // (e.g. Skia), it can have fraction part such as 0.5 pixel. The value | 59 // (e.g. Skia), it can have fraction part such as 0.5 pixel. The value |
56 // defines a range from full shadow color at the start point inside the | 60 // defines a range from full shadow color at the start point inside the |
57 // shadow to fully transparent at the end point outside it. The range is | 61 // shadow to fully transparent at the end point outside it. The range is |
58 // perpendicular to and centered on the shadow edge. For example, a blur | 62 // perpendicular to and centered on the shadow edge. For example, a blur |
59 // amount of 4.0 means to have a blurry shadow edge of 4 pixels that | 63 // amount of 4.0 means to have a blurry shadow edge of 4 pixels that |
60 // transitions from full shadow color to fully transparent and with 2 pixels | 64 // transitions from full shadow color to fully transparent and with 2 pixels |
61 // inside the shadow and 2 pixels goes beyond the edge. | 65 // inside the shadow and 2 pixels goes beyond the edge. |
62 double blur_; | 66 double blur_; |
63 | 67 |
64 SkColor color_; | 68 SkColor color_; |
65 }; | 69 }; |
66 | 70 |
67 inline bool operator==(const ShadowValue& lhs, const ShadowValue& rhs) { | 71 inline bool operator==(const ShadowValue& lhs, const ShadowValue& rhs) { |
68 return lhs.offset() == rhs.offset() && lhs.blur() == rhs.blur() && | 72 return lhs.offset() == rhs.offset() && lhs.blur() == rhs.blur() && |
69 lhs.color() == rhs.color(); | 73 lhs.color() == rhs.color(); |
70 } | 74 } |
71 | 75 |
72 } // namespace gfx | 76 } // namespace gfx |
73 | 77 |
74 #endif // UI_GFX_SHADOW_VALUE_H_ | 78 #endif // UI_GFX_SHADOW_VALUE_H_ |
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