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