2 * Copyright 2013 Google Inc.
4 * Use of this source code is governed by a BSD-style license that can be
5 * found in the LICENSE file.
8 #ifndef SkAlphaThresholdFilter_DEFINED
9 #define SkAlphaThresholdFilter_DEFINED
12 #include "SkImageFilter.h"
14 class SK_API SkAlphaThresholdFilter {
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
23 static SkImageFilter* Create(const SkRegion& region, SkScalar innerThreshold,
24 SkScalar outerThreshold, SkImageFilter* input = NULL);