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 SkRRectsGaussianEdgeMaskFilter_DEFINED
9 #define SkRRectsGaussianEdgeMaskFilter_DEFINED
10 
11 #include "SkMaskFilter.h"
12 #include "SkScalar.h"
13 
14 class SkRRect;
15 
16 class SK_API SkRRectsGaussianEdgeMaskFilter {
17 public:
18     /** Returns a mask filter that applies a Gaussian blur depending on distance to the edge
19      *  of the intersection of two round rects.
20      *  Currently this is only useable with round rects that have the same radii at
21      *  all the corners and for which the x & y radii are equal.
22      *
23      *  In order to minimize fill the coverage geometry that should be drawn should be no larger
24      *  than the intersection of the bounding boxes of the two round rects. Ambitious users can
25      *  omit the center area of the coverage geometry if it is known to be occluded.
26      */
27     static sk_sp<SkMaskFilter> Make(const SkRRect& first,
28                                     const SkRRect& second,
29                                     SkScalar radius);
30 
31     SK_DECLARE_FLATTENABLE_REGISTRAR_GROUP()
32 
33 private:
34     SkRRectsGaussianEdgeMaskFilter(); // can't be instantiated
35 };
36 
37 #endif
38