GrPathUtils.h revision d38f137e9b813f8193675ebd3dfbfe8bc42639e9 
1
2/*
3 * Copyright 2011 Google Inc.
4 *
5 * Use of this source code is governed by a BSD-style license that can be
6 * found in the LICENSE file.
7 */
8
9
10#ifndef GrPathUtils_DEFINED
11#define GrPathUtils_DEFINED
12
13#include "GrMatrix.h"
14#include "GrPath.h"
15
16/**
17 *  Utilities for evaluating paths.
18 */
19namespace GrPathUtils {
20    GrScalar scaleToleranceToSrc(GrScalar devTol,
21                                 const GrMatrix& viewM,
22                                 const GrRect& pathBounds);
23
24    /// Since we divide by tol if we're computing exact worst-case bounds,
25    /// very small tolerances will be increased to gMinCurveTol.
26    int worstCasePointCount(const GrPath&,
27                            int* subpaths,
28                            GrScalar tol);
29    /// Since we divide by tol if we're computing exact worst-case bounds,
30    /// very small tolerances will be increased to gMinCurveTol.
31    uint32_t quadraticPointCount(const GrPoint points[], GrScalar tol);
32    uint32_t generateQuadraticPoints(const GrPoint& p0,
33                                     const GrPoint& p1,
34                                     const GrPoint& p2,
35                                     GrScalar tolSqd,
36                                     GrPoint** points,
37                                     uint32_t pointsLeft);
38    /// Since we divide by tol if we're computing exact worst-case bounds,
39    /// very small tolerances will be increased to gMinCurveTol.
40    uint32_t cubicPointCount(const GrPoint points[], GrScalar tol);
41    uint32_t generateCubicPoints(const GrPoint& p0,
42                                 const GrPoint& p1,
43                                 const GrPoint& p2,
44                                 const GrPoint& p3,
45                                 GrScalar tolSqd,
46                                 GrPoint** points,
47                                 uint32_t pointsLeft);
48
49};
50#endif
51