1 /*
2  * Copyright 2016 Google Inc.
3  *
4  * Use of this source code is governed by a BSD-style license that can be
5  * found in the LICENSE file.
6  */
7 
8 #ifndef SkRRectsGaussianEdgeShader_DEFINED
9 #define SkRRectsGaussianEdgeShader_DEFINED
10 
11 #include "SkShader.h"
12 
13 class SkRRect;
14 
15 class SK_API SkRRectsGaussianEdgeShader {
16 public:
17     /** Returns a shader that applies a Gaussian blur depending on distance to the edge
18      *  of the intersection of two round rects.
19      *  Currently this is only useable with round rects that have the same radii at
20      *  all the corners and for which the x & y radii are equal.
21      *  Raster will draw nothing.
22      *
23      *  The coverage geometry that should be drawn should be no larger than the intersection
24      *  of the bounding boxes of the two round rects. Ambitious users can omit the center
25      *  area of the coverage geometry if it is known to be occluded.
26      */
27     static sk_sp<SkShader> Make(const SkRRect& first,
28                                 const SkRRect& second,
29                                 SkScalar radius, SkScalar unused = 0.0f);
30 
31     SK_DECLARE_FLATTENABLE_REGISTRAR_GROUP()
32 
33 private:
34     SkRRectsGaussianEdgeShader(); // can't be instantiated
35 };
36 
37 #endif
38