| /* |
| * Copyright 2014 Google Inc. |
| * |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| |
| #include "src/core/SkVertState.h" |
| |
| bool VertState::Triangles(VertState* state) { |
| int index = state->fCurrIndex; |
| if (index + 3 > state->fCount) { |
| return false; |
| } |
| state->f0 = index + 0; |
| state->f1 = index + 1; |
| state->f2 = index + 2; |
| state->fCurrIndex = index + 3; |
| return true; |
| } |
| |
| bool VertState::TrianglesX(VertState* state) { |
| const uint16_t* indices = state->fIndices; |
| int index = state->fCurrIndex; |
| if (index + 3 > state->fCount) { |
| return false; |
| } |
| state->f0 = indices[index + 0]; |
| state->f1 = indices[index + 1]; |
| state->f2 = indices[index + 2]; |
| state->fCurrIndex = index + 3; |
| return true; |
| } |
| |
| bool VertState::TriangleStrip(VertState* state) { |
| int index = state->fCurrIndex; |
| if (index + 3 > state->fCount) { |
| return false; |
| } |
| state->f2 = index + 2; |
| if (index & 1) { |
| state->f0 = index + 1; |
| state->f1 = index + 0; |
| } else { |
| state->f0 = index + 0; |
| state->f1 = index + 1; |
| } |
| state->fCurrIndex = index + 1; |
| return true; |
| } |
| |
| bool VertState::TriangleStripX(VertState* state) { |
| const uint16_t* indices = state->fIndices; |
| int index = state->fCurrIndex; |
| if (index + 3 > state->fCount) { |
| return false; |
| } |
| state->f2 = indices[index + 2]; |
| if (index & 1) { |
| state->f0 = indices[index + 1]; |
| state->f1 = indices[index + 0]; |
| } else { |
| state->f0 = indices[index + 0]; |
| state->f1 = indices[index + 1]; |
| } |
| state->fCurrIndex = index + 1; |
| return true; |
| } |
| |
| bool VertState::TriangleFan(VertState* state) { |
| int index = state->fCurrIndex; |
| if (index + 3 > state->fCount) { |
| return false; |
| } |
| state->f0 = 0; |
| state->f1 = index + 1; |
| state->f2 = index + 2; |
| state->fCurrIndex = index + 1; |
| return true; |
| } |
| |
| bool VertState::TriangleFanX(VertState* state) { |
| const uint16_t* indices = state->fIndices; |
| int index = state->fCurrIndex; |
| if (index + 3 > state->fCount) { |
| return false; |
| } |
| state->f0 = indices[0]; |
| state->f1 = indices[index + 1]; |
| state->f2 = indices[index + 2]; |
| state->fCurrIndex = index + 1; |
| return true; |
| } |
| |
| VertState::Proc VertState::chooseProc(SkVertices::VertexMode mode) { |
| switch (mode) { |
| case SkVertices::kTriangles_VertexMode: |
| return fIndices ? TrianglesX : Triangles; |
| case SkVertices::kTriangleStrip_VertexMode: |
| return fIndices ? TriangleStripX : TriangleStrip; |
| case SkVertices::kTriangleFan_VertexMode: |
| return fIndices ? TriangleFanX : TriangleFan; |
| default: |
| return nullptr; |
| } |
| } |