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 innerThreshold, SkScalar outerThreshold); 24 }; 25 26 #endif 27