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 #include "SkMatrix.h" 13 14 /** 15 * Base class for 1D kernel effects. The kernel operates either in X or Y and 16 * has a pixel radius. The kernel is specified in the src texture's space 17 * and the kernel center is pinned to a texel's center. The radius specifies 18 * the number of texels on either side of the center texel in X or Y that are 19 * read. Since the center pixel is also read, the total width is one larger than 20 * two times the radius. 21 */ 22 23 class Gr1DKernelEffect : public GrSingleTextureEffect { 24 25 public: 26 enum Direction { 27 kX_Direction, 28 kY_Direction, 29 }; 30 ~Gr1DKernelEffect()31 ~Gr1DKernelEffect() override {} 32 WidthFromRadius(int radius)33 static int WidthFromRadius(int radius) { return 2 * radius + 1; } 34 radius()35 int radius() const { return fRadius; } width()36 int width() const { return WidthFromRadius(fRadius); } direction()37 Direction direction() const { return fDirection; } 38 dumpInfo()39 SkString dumpInfo() const override { 40 SkString str; 41 str.appendf("Direction: %s, Radius: %d ", kX_Direction == fDirection ? "X" : "Y", fRadius); 42 str.append(INHERITED::dumpInfo()); 43 return str; 44 } 45 46 protected: Gr1DKernelEffect(OptimizationFlags optFlags,sk_sp<GrTextureProxy> proxy,Direction direction,int radius)47 Gr1DKernelEffect(OptimizationFlags optFlags, 48 sk_sp<GrTextureProxy> proxy, Direction direction, int radius) 49 : INHERITED(optFlags, std::move(proxy), nullptr, SkMatrix::I()) 50 , fDirection(direction) 51 , fRadius(radius) { 52 } 53 54 private: 55 Direction fDirection; 56 int fRadius; 57 58 typedef GrSingleTextureEffect INHERITED; 59 }; 60 61 #endif 62