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_ 63
