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 "include/core/SkColor.h"
12#include "include/core/SkPoint.h"
13#include "include/core/SkRefCnt.h"
14#include <functional> // std::function
15
16class SkMatrix;
17class SkPath;
18struct SkPoint3;
19class SkVertices;
20
21namespace SkShadowTessellator {
22
23typedef std::function<SkScalar(SkScalar, SkScalar)> HeightFunc;
24
25/**
26 * This function generates an ambient shadow mesh for a path by walking the path, outsetting by
27 * the radius, and setting inner and outer colors to umbraColor and penumbraColor, respectively.
28 * If transparent is true, then the center of the ambient shadow will be filled in.
29 */
30sk_sp<SkVertices> MakeAmbient(const SkPath& path, const SkMatrix& ctm,
31 const SkPoint3& zPlane, bool transparent);
32
33/**
34 * This function generates a spot shadow mesh for a path by walking the transformed path,
35 * further transforming by the scale and translation, and outsetting and insetting by a radius.
36 * The center will be clipped against the original path unless transparent is true.
37 */
38sk_sp<SkVertices> MakeSpot(const SkPath& path, const SkMatrix& ctm, const SkPoint3& zPlane,
39 const SkPoint3& lightPos, SkScalar lightRadius, bool transparent);
40
41
42} // namespace SkShadowTessellator
43
44#endif
45