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1 /* | 1 /* |
2 * Copyright 2013 Google Inc. | 2 * Copyright 2013 Google Inc. |
3 * | 3 * |
4 * Use of this source code is governed by a BSD-style license that can be | 4 * Use of this source code is governed by a BSD-style license that can be |
5 * found in the LICENSE file. | 5 * found in the LICENSE file. |
6 */ | 6 */ |
7 | 7 |
8 #ifndef SkAlphaThresholdFilter_DEFINED | 8 #ifndef SkAlphaThresholdFilter_DEFINED |
9 #define SkAlphaThresholdFilter_DEFINED | 9 #define SkAlphaThresholdFilter_DEFINED |
10 | 10 |
11 #include "SkRegion.h" | 11 #include "SkRegion.h" |
12 #include "SkImageFilter.h" | 12 #include "SkImageFilter.h" |
13 | 13 |
14 class SK_API SkAlphaThresholdFilter { | 14 class SK_API SkAlphaThresholdFilter { |
15 public: | 15 public: |
16 /** | 16 /** |
17 * Creates an image filter that samples a region. If the sample is inside th
e | 17 * Creates an image filter that samples a region. If the sample is inside th
e |
18 * region the alpha of the image is boosted up to a threshold value. If it i
s | 18 * region the alpha of the image is boosted up to a threshold value. If it i
s |
19 * outside the region then the alpha is decreased to the threshold value. | 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 | 20 * The 0,0 point of the region corresponds to the upper left corner of the |
21 * source image. | 21 * source image. |
22 */ | 22 */ |
23 static SkImageFilter* Create(const SkRegion& region, SkScalar innerThreshold
, SkScalar outerThreshold); | 23 static SkImageFilter* Create(const SkRegion& region, SkScalar innerThreshold
, |
| 24 SkScalar outerThreshold, SkImageFilter* input =
NULL); |
24 }; | 25 }; |
25 | 26 |
26 #endif | 27 #endif |
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