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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 | |
3 // found in the LICENSE file. | |
4 | |
5 #ifndef UI_GFX_SHADOW_VALUE_H_ | |
6 #define UI_GFX_SHADOW_VALUE_H_ | |
7 | |
8 #include <string> | |
9 #include <vector> | |
10 | |
11 #include "third_party/skia/include/core/SkColor.h" | |
12 #include "ui/gfx/gfx_export.h" | |
13 #include "ui/gfx/point.h" | |
14 | |
15 namespace gfx { | |
16 | |
17 class Insets; | |
18 | |
19 class ShadowValue; | |
20 typedef std::vector<ShadowValue> ShadowValues; | |
21 | |
22 // ShadowValue encapsulates parameters needed to define a shadow, including the | |
23 // shadow's offset, blur amount and color. | |
24 class GFX_EXPORT ShadowValue { | |
25 public: | |
26 ShadowValue(); | |
27 ShadowValue(const gfx::Point& offset, double blur, SkColor color); | |
28 ~ShadowValue(); | |
29 | |
30 int x() const { return offset_.x(); } | |
31 int y() const { return offset_.y(); } | |
32 const gfx::Point& offset() const { return offset_; } | |
33 double blur() const { return blur_; } | |
34 SkColor color() const { return color_; } | |
35 | |
36 ShadowValue Scale(float scale) const; | |
37 | |
38 std::string ToString() const; | |
39 | |
40 // Gets margin space needed for shadows. Note that values in returned Insets | |
41 // are negative because shadow margins are outside a boundary. | |
42 static Insets GetMargin(const ShadowValues& shadows); | |
43 | |
44 private: | |
45 gfx::Point offset_; | |
46 | |
47 // Blur amount of the shadow in pixels. If underlying implementation supports | |
48 // (e.g. Skia), it can have fraction part such as 0.5 pixel. The value | |
49 // defines a range from full shadow color at the start point inside the | |
50 // shadow to fully transparent at the end point outside it. The range is | |
51 // perpendicular to and centered on the shadow edge. For example, a blur | |
52 // amount of 4.0 means to have a blurry shadow edge of 4 pixels that | |
53 // transitions from full shadow color to fully transparent and with 2 pixels | |
54 // inside the shadow and 2 pixels goes beyond the edge. | |
55 double blur_; | |
56 | |
57 SkColor color_; | |
58 }; | |
59 | |
60 } // namespace gfx | |
61 | |
62 #endif // UI_GFX_SHADOW_VALUE_H_ | |
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