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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 #include "SkVertState.h"
9 
Triangles(VertState * state)10 bool VertState::Triangles(VertState* state) {
11     int index = state->fCurrIndex;
12     if (index + 3 > state->fCount) {
13         return false;
14     }
15     state->f0 = index + 0;
16     state->f1 = index + 1;
17     state->f2 = index + 2;
18     state->fCurrIndex = index + 3;
19     return true;
20 }
21 
TrianglesX(VertState * state)22 bool VertState::TrianglesX(VertState* state) {
23     const uint16_t* indices = state->fIndices;
24     int index = state->fCurrIndex;
25     if (index + 3 > state->fCount) {
26         return false;
27     }
28     state->f0 = indices[index + 0];
29     state->f1 = indices[index + 1];
30     state->f2 = indices[index + 2];
31     state->fCurrIndex = index + 3;
32     return true;
33 }
34 
TriangleStrip(VertState * state)35 bool VertState::TriangleStrip(VertState* state) {
36     int index = state->fCurrIndex;
37     if (index + 3 > state->fCount) {
38         return false;
39     }
40     state->f2 = index + 2;
41     if (index & 1) {
42         state->f0 = index + 1;
43         state->f1 = index + 0;
44     } else {
45         state->f0 = index + 0;
46         state->f1 = index + 1;
47     }
48     state->fCurrIndex = index + 1;
49     return true;
50 }
51 
TriangleStripX(VertState * state)52 bool VertState::TriangleStripX(VertState* state) {
53     const uint16_t* indices = state->fIndices;
54     int index = state->fCurrIndex;
55     if (index + 3 > state->fCount) {
56         return false;
57     }
58     state->f2 = indices[index + 2];
59     if (index & 1) {
60         state->f0 = indices[index + 1];
61         state->f1 = indices[index + 0];
62     } else {
63         state->f0 = indices[index + 0];
64         state->f1 = indices[index + 1];
65     }
66     state->fCurrIndex = index + 1;
67     return true;
68 }
69 
TriangleFan(VertState * state)70 bool VertState::TriangleFan(VertState* state) {
71     int index = state->fCurrIndex;
72     if (index + 3 > state->fCount) {
73         return false;
74     }
75     state->f0 = 0;
76     state->f1 = index + 1;
77     state->f2 = index + 2;
78     state->fCurrIndex = index + 1;
79     return true;
80 }
81 
TriangleFanX(VertState * state)82 bool VertState::TriangleFanX(VertState* state) {
83     const uint16_t* indices = state->fIndices;
84     int index = state->fCurrIndex;
85     if (index + 3 > state->fCount) {
86         return false;
87     }
88     state->f0 = indices[0];
89     state->f1 = indices[index + 1];
90     state->f2 = indices[index + 2];
91     state->fCurrIndex = index + 1;
92     return true;
93 }
94 
chooseProc(SkVertices::VertexMode mode)95 VertState::Proc VertState::chooseProc(SkVertices::VertexMode mode) {
96     switch (mode) {
97         case SkVertices::kTriangles_VertexMode:
98             return fIndices ? TrianglesX : Triangles;
99         case SkVertices::kTriangleStrip_VertexMode:
100             return fIndices ? TriangleStripX : TriangleStrip;
101         case SkVertices::kTriangleFan_VertexMode:
102             return fIndices ? TriangleFanX : TriangleFan;
103         default:
104             return nullptr;
105     }
106 }
107