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 #include "SkShader.h" 9 #include "SkBitmap.h" 10 #include "SkRegion.h" 11 #include "SkString.h" 12 13 class SK_API SkBitmapAlphaThresholdShader : public SkShader { 14 public: 15 /** 16 * Creates a shader that samples a bitmap and a region. If the sample is inside the region 17 * the alpha of the bitmap color is boosted up to a threshold value. If it is 18 * outside the region then the bitmap alpha is decreased to the threshold value. 19 * The 0,0 point of the region corresponds to the upper left corner of the bitmap 20 * Currently, this only has a GPU implementation, doesn't respect the paint's bitmap 21 * filter setting, and always uses clamp mode. 22 */ 23 static SkShader* Create(const SkBitmap& bitmap, const SkRegion& region, U8CPU threshold); 24 }; 25
