| /* |
| * 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 |