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 "SkRegion.h"
12 #include "SkImageFilter.h"
13 
14 class SK_API SkAlphaThresholdFilter {
15 public:
16     /**
17      * Creates an image filter that samples a region. If the sample is inside the
18      * region the alpha of the image is boosted up to a threshold value. If it is
19      * outside the region then the alpha is decreased to the threshold value.
20      * The 0,0 point of the region corresponds to the upper left corner of the
21      * source image.
22      */
23     static SkImageFilter* Create(const SkRegion& region, SkScalar innerMin,
24                                  SkScalar outerMax, SkImageFilter* input = NULL);
25     SK_DECLARE_FLATTENABLE_REGISTRAR_GROUP();
26 };
27 
28 #endif
29