SkShadowTessellator.h

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/*
 * Copyright 2017 Google Inc.
 *
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 */
 
#ifndef SkShadowTessellator_DEFINED
#define SkShadowTessellator_DEFINED
 
#if !defined(SK_ENABLE_OPTIMIZE_SIZE)
 
#include "include/core/SkRefCnt.h"
#include "include/core/SkScalar.h"
 
#include <functional>
 
class SkMatrix;
class SkPath;
class SkVertices;
struct SkPoint3;
 
namespace SkShadowTessellator {
 
typedef std::function<SkScalar(SkScalar, SkScalar)> HeightFunc;
 
/**
 * This function generates an ambient shadow mesh for a path by walking the path, outsetting by
 * the radius, and setting inner and outer colors to umbraColor and penumbraColor, respectively.
 * If transparent is true, then the center of the ambient shadow will be filled in.
 */
sk_sp<SkVertices> MakeAmbient(const SkPath& path, const SkMatrix& ctm,
                              const SkPoint3& zPlane, bool transparent);
 
/**
 * This function generates a spot shadow mesh for a path by walking the transformed path,
 * further transforming by the scale and translation, and outsetting and insetting by a radius.
 * The center will be clipped against the original path unless transparent is true.
 */
sk_sp<SkVertices> MakeSpot(const SkPath& path, const SkMatrix& ctm, const SkPoint3& zPlane,
                           const SkPoint3& lightPos, SkScalar lightRadius, bool transparent,
                           bool directional);
 
 
}  // namespace SkShadowTessellator
 
#endif // SK_ENABLE_OPTIMIZE_SIZE
 
#endif