1/* 2 * Copyright 2017 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 SkShadowTessellator_DEFINED 9#define SkShadowTessellator_DEFINED 10 11#include "SkColor.h" 12#include "SkPoint.h" 13#include "SkRefCnt.h" 14 15class SkMatrix; 16class SkPath; 17class SkVertices; 18 19namespace SkShadowTessellator { 20 21typedef std::function<SkScalar(SkScalar, SkScalar)> HeightFunc; 22 23/** 24 * This function generates an ambient shadow mesh for a path by walking the path, outsetting by 25 * the radius, and setting inner and outer colors to umbraColor and penumbraColor, respectively. 26 * If transparent is true, then the center of the ambient shadow will be filled in. 27 */ 28sk_sp<SkVertices> MakeAmbient(const SkPath& path, const SkMatrix& ctm, 29 HeightFunc heightFunc, SkScalar ambientAlpha, bool transparent); 30 31/** 32 * This function generates a spot shadow mesh for a path by walking the transformed path, 33 * further transforming by the scale and translation, and outsetting and insetting by a radius. 34 * The center will be clipped against the original path unless transparent is true. 35 */ 36sk_sp<SkVertices> MakeSpot(const SkPath& path, const SkMatrix& ctm, HeightFunc heightFunc, 37 const SkPoint3& lightPos, SkScalar lightRadius, 38 SkScalar spotAlpha, bool transparent); 39} 40 41#endif 42