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/*
* Copyright 2014 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef SkVertState_DEFINED
#define SkVertState_DEFINED
#include "SkVertices.h"
/** \struct VertState
This is a helper for drawVertices(). It is used to iterate over the triangles
that are to be rendered based on an SkCanvas::VertexMode and (optionally) an
index array. It does not copy the index array and the client must ensure it
remains valid for the lifetime of the VertState object.
*/
struct VertState {
int f0, f1, f2;
/**
* Construct a VertState from a vertex count, index array, and index count.
* If the vertices are unindexed pass nullptr for indices.
*/
VertState(int vCount, const uint16_t indices[], int indexCount)
: fIndices(indices) {
fCurrIndex = 0;
if (indices) {
fCount = indexCount;
} else {
fCount = vCount;
}
}
typedef bool (*Proc)(VertState*);
/**
* Choose an appropriate function to traverse the vertices.
* @param mode Specifies the SkCanvas::VertexMode.
*/
Proc chooseProc(SkVertices::VertexMode mode);
private:
int fCount;
int fCurrIndex;
const uint16_t* fIndices;
static bool Triangles(VertState*);
static bool TrianglesX(VertState*);
static bool TriangleStrip(VertState*);
static bool TriangleStripX(VertState*);
static bool TriangleFan(VertState*);
static bool TriangleFanX(VertState*);
};
#endif
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