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comparison: gfx/skia/trunk/src/core/SkQuadClipper.h
gfx/skia/trunk/src/core/SkQuadClipper.h
- branch
- TOR_BUG_3246
- changeset 5
- 4ab42b5ab56c
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| -1:000000000000 | 0:d23a893c4121 |
|---|---|
| 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 SkQuadClipper_DEFINED | |
| 11 #define SkQuadClipper_DEFINED | |
| 12 | |
| 13 #include "SkPath.h" | |
| 14 | |
| 15 /** This class is initialized with a clip rectangle, and then can be fed quads, | |
| 16 which must already be monotonic in Y. | |
| 17 | |
| 18 In the future, it might return a series of segments, allowing it to clip | |
| 19 also in X, to ensure that all segments fit in a finite coordinate system. | |
| 20 */ | |
| 21 class SkQuadClipper { | |
| 22 public: | |
| 23 SkQuadClipper(); | |
| 24 | |
| 25 void setClip(const SkIRect& clip); | |
| 26 | |
| 27 bool clipQuad(const SkPoint src[3], SkPoint dst[3]); | |
| 28 | |
| 29 private: | |
| 30 SkRect fClip; | |
| 31 }; | |
| 32 | |
| 33 /** Iterator that returns the clipped segements of a quad clipped to a rect. | |
| 34 The segments will be either lines or quads (based on SkPath::Verb), and | |
| 35 will all be monotonic in Y | |
| 36 */ | |
| 37 class SkQuadClipper2 { | |
| 38 public: | |
| 39 bool clipQuad(const SkPoint pts[3], const SkRect& clip); | |
| 40 bool clipCubic(const SkPoint pts[4], const SkRect& clip); | |
| 41 | |
| 42 SkPath::Verb next(SkPoint pts[]); | |
| 43 | |
| 44 private: | |
| 45 SkPoint* fCurrPoint; | |
| 46 SkPath::Verb* fCurrVerb; | |
| 47 | |
| 48 enum { | |
| 49 kMaxVerbs = 13, | |
| 50 kMaxPoints = 32 | |
| 51 }; | |
| 52 SkPoint fPoints[kMaxPoints]; | |
| 53 SkPath::Verb fVerbs[kMaxVerbs]; | |
| 54 | |
| 55 void clipMonoQuad(const SkPoint srcPts[3], const SkRect& clip); | |
| 56 void clipMonoCubic(const SkPoint srcPts[4], const SkRect& clip); | |
| 57 void appendVLine(SkScalar x, SkScalar y0, SkScalar y1, bool reverse); | |
| 58 void appendQuad(const SkPoint pts[3], bool reverse); | |
| 59 void appendCubic(const SkPoint pts[4], bool reverse); | |
| 60 }; | |
| 61 | |
| 62 #ifdef SK_DEBUG | |
| 63 void sk_assert_monotonic_x(const SkPoint pts[], int count); | |
| 64 void sk_assert_monotonic_y(const SkPoint pts[], int count); | |
| 65 #else | |
| 66 #define sk_assert_monotonic_x(pts, count) | |
| 67 #define sk_assert_monotonic_y(pts, count) | |
| 68 #endif | |
| 69 | |
| 70 #endif |
