1 /*
2  * Copyright 2013 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 SkAlphaThresholdFilter_DEFINED
9 #define SkAlphaThresholdFilter_DEFINED
10 
11 #include "SkImageFilter.h"
12 
13 class SkRegion;
14 
15 class SK_API SkAlphaThresholdFilter {
16 public:
17     /**
18      * Creates an image filter that samples a region. If the sample is inside the
19      * region the alpha of the image is boosted up to a threshold value. If it is
20      * outside the region then the alpha is decreased to the threshold value.
21      * The 0,0 point of the region corresponds to the upper left corner of the
22      * source image.
23      */
24     static sk_sp<SkImageFilter> Make(const SkRegion& region, SkScalar innerMin,
25                                      SkScalar outerMax, sk_sp<SkImageFilter> input,
26                                      const SkImageFilter::CropRect* cropRect = nullptr);
27 
28 
29     static void RegisterFlattenables();
30 };
31 
32 #endif
33