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 23class Gr1DKernelEffect : public GrSingleTextureEffect { 24 25public: 26 enum Direction { 27 kX_Direction, 28 kY_Direction, 29 }; 30 31 Gr1DKernelEffect(GrResourceProvider* resourceProvider, OptimizationFlags optFlags, 32 sk_sp<GrTextureProxy> proxy, Direction direction, int radius) 33 : INHERITED(resourceProvider, optFlags, std::move(proxy), nullptr, SkMatrix::I()) 34 , fDirection(direction) 35 , fRadius(radius) { 36 } 37 38 ~Gr1DKernelEffect() override {} 39 40 static int WidthFromRadius(int radius) { return 2 * radius + 1; } 41 42 int radius() const { return fRadius; } 43 int width() const { return WidthFromRadius(fRadius); } 44 Direction direction() const { return fDirection; } 45 46 SkString dumpInfo() const override { 47 SkString str; 48 str.appendf("Direction: %s, Radius: %d ", kX_Direction == fDirection ? "X" : "Y", fRadius); 49 str.append(INHERITED::dumpInfo()); 50 return str; 51 } 52 53private: 54 Direction fDirection; 55 int fRadius; 56 57 typedef GrSingleTextureEffect INHERITED; 58}; 59 60#endif 61