1
2/*
3 * Copyright 2009 The Android Open Source Project
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 SkEdgeClipper_DEFINED
11#define SkEdgeClipper_DEFINED
12
13#include "SkPath.h"
14
15/** This is basically an iterator. It is initialized with an edge and a clip,
16    and then next() is called until it returns kDone_Verb.
17 */
18class SkEdgeClipper {
19public:
20    bool clipQuad(const SkPoint pts[3], const SkRect& clip);
21    bool clipCubic(const SkPoint pts[4], const SkRect& clip);
22
23    SkPath::Verb next(SkPoint pts[]);
24
25private:
26    SkPoint*        fCurrPoint;
27    SkPath::Verb*   fCurrVerb;
28
29    enum {
30        kMaxVerbs = 13,
31        kMaxPoints = 32
32    };
33    SkPoint         fPoints[kMaxPoints];
34    SkPath::Verb    fVerbs[kMaxVerbs];
35
36    void clipMonoQuad(const SkPoint srcPts[3], const SkRect& clip);
37    void clipMonoCubic(const SkPoint srcPts[4], const SkRect& clip);
38    void appendVLine(SkScalar x, SkScalar y0, SkScalar y1, bool reverse);
39    void appendQuad(const SkPoint pts[3], bool reverse);
40    void appendCubic(const SkPoint pts[4], bool reverse);
41};
42
43#ifdef SK_DEBUG
44    void sk_assert_monotonic_x(const SkPoint pts[], int count);
45    void sk_assert_monotonic_y(const SkPoint pts[], int count);
46#else
47    #define sk_assert_monotonic_x(pts, count)
48    #define sk_assert_monotonic_y(pts, count)
49#endif
50
51#endif
52