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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
#include "SkTDArray.h"
#include "SkRefCnt.h"
#include "SkPoint.h"
#include "SkColor.h"
class SkMatrix;
class SkPath;
class SkShadowVertices : public SkRefCnt {
public:
/**
* 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.
*/
static sk_sp<SkShadowVertices> MakeAmbient(const SkPath& path, SkScalar radius,
SkColor umbraColor, SkColor penumbraColor,
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.
*/
static sk_sp<SkShadowVertices> MakeSpot(const SkPath& path, SkScalar scale,
const SkVector& translate, SkScalar radius,
SkColor umbraColor, SkColor penumbraColor,
bool transparent);
int vertexCount() const { return fVertexCnt; }
const SkPoint* positions() const { return fPositions.get(); }
const SkColor* colors() const { return fColors.get(); }
int indexCount() const { return fIndexCnt; }
const uint16_t* indices() const { return fIndices.get(); }
private:
template<typename T> using Deleter = SkTDArray<SkPoint>::Deleter;
template<typename T> using UniqueArray = std::unique_ptr<const T[], Deleter<T>>;
SkShadowVertices(UniqueArray<SkPoint>&& positions, UniqueArray<SkColor>&& colors,
UniqueArray<uint16_t>&& indices, int vertexCnt, int indexCnt)
: fVertexCnt(vertexCnt)
, fIndexCnt(indexCnt)
, fPositions(std::move(positions))
, fColors(std::move(colors))
, fIndices(std::move(indices)) {
SkASSERT(SkToBool(indices) == SkToBool(indexCnt));
}
int fVertexCnt;
int fIndexCnt;
UniqueArray<SkPoint> fPositions;
UniqueArray<SkColor> fColors;
UniqueArray<uint16_t> fIndices;
};
#endif
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