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1 /* | |
2 * Copyright 2014 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 SkVertState_DEFINED | |
9 #define SkVertState_DEFINED | |
10 | |
11 #include "SkCanvas.h" | |
12 | |
13 /** \struct VertState | |
14 This is a helper for drawVertices(). It is used to iterate over the triangle
s | |
15 that are to be rendered based on an SkCanvas::VertexMode and (optionally) an | |
16 index array. It does not copy the index array and the client must ensure it | |
17 remains valid for the lifetime of the VertState object. | |
18 */ | |
19 | |
20 struct VertState { | |
21 int f0, f1, f2; | |
22 | |
23 /** | |
24 * Construct a VertState from a vertex count, index array, and index count. | |
25 * If the vertices are unindexed pass NULL for indices. | |
26 */ | |
27 VertState(int vCount, const uint16_t indices[], int indexCount) | |
28 : fIndices(indices) { | |
29 fCurrIndex = 0; | |
30 if (indices) { | |
31 fCount = indexCount; | |
32 } else { | |
33 fCount = vCount; | |
34 } | |
35 } | |
36 | |
37 typedef bool (*Proc)(VertState*); | |
38 | |
39 /** | |
40 * Choose an appropriate function to traverse the vertices. | |
41 * @param mode Specifies the SkCanvas::VertexMode. | |
42 */ | |
43 Proc chooseProc(SkCanvas::VertexMode mode); | |
44 | |
45 private: | |
46 int fCount; | |
47 int fCurrIndex; | |
48 const uint16_t* fIndices; | |
49 | |
50 static bool Triangles(VertState*); | |
51 static bool TrianglesX(VertState*); | |
52 static bool TriangleStrip(VertState*); | |
53 static bool TriangleStripX(VertState*); | |
54 static bool TriangleFan(VertState*); | |
55 static bool TriangleFanX(VertState*); | |
56 }; | |
57 | |
58 #endif | |
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