Gr1DKernelEffect.h revision 80bacfeb4bda06541e8695bd502229727bccfeab
1/* 2 * Copyright 2012 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 Gr1DKernelEffect_DEFINED 9#define Gr1DKernelEffect_DEFINED 10 11#include "GrSingleTextureEffect.h" 12 13/** 14 * Base class for 1D kernel effects. The kernel operates either in X or Y and 15 * has a pixel radius. The kernel is specified in the src texture's space 16 * and the kernel center is pinned to a texel's center. The radius specifies 17 * the number of texels on either side of the center texel in X or Y that are 18 * read. Since the center pixel is also read, the total width is one larger than 19 * two times the radius. 20 */ 21class Gr1DKernelEffect : public GrSingleTextureEffect { 22 23public: 24 enum Direction { 25 kX_Direction, 26 kY_Direction, 27 }; 28 29 Gr1DKernelEffect(GrTexture* texture, 30 Direction direction, 31 int radius) 32 : GrSingleTextureEffect(texture) 33 , fDirection(direction) 34 , fRadius(radius) {} 35 36 virtual ~Gr1DKernelEffect() {}; 37 38 static int WidthFromRadius(int radius) { return 2 * radius + 1; } 39 40 int radius() const { return fRadius; } 41 int width() const { return WidthFromRadius(fRadius); } 42 Direction direction() const { return fDirection; } 43 44private: 45 46 Direction fDirection; 47 int fRadius; 48 49 typedef GrSingleTextureEffect INHERITED; 50}; 51 52#endif 53