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- /*
- * Copyright 2009 The Android Open Source Project
- *
- * Use of this source code is governed by a BSD-style license that can be
- * found in the LICENSE file.
- */
- #ifndef SkQuadClipper_DEFINED
- #define SkQuadClipper_DEFINED
- #include "include/core/SkPath.h"
- /** This class is initialized with a clip rectangle, and then can be fed quads,
- which must already be monotonic in Y.
- In the future, it might return a series of segments, allowing it to clip
- also in X, to ensure that all segments fit in a finite coordinate system.
- */
- class SkQuadClipper {
- public:
- SkQuadClipper();
- void setClip(const SkIRect& clip);
- bool clipQuad(const SkPoint src[3], SkPoint dst[3]);
- private:
- SkRect fClip;
- };
- /** Iterator that returns the clipped segements of a quad clipped to a rect.
- The segments will be either lines or quads (based on SkPath::Verb), and
- will all be monotonic in Y
- */
- class SkQuadClipper2 {
- public:
- bool clipQuad(const SkPoint pts[3], const SkRect& clip);
- bool clipCubic(const SkPoint pts[4], const SkRect& clip);
- SkPath::Verb next(SkPoint pts[]);
- private:
- SkPoint* fCurrPoint;
- SkPath::Verb* fCurrVerb;
- enum {
- kMaxVerbs = 13,
- kMaxPoints = 32
- };
- SkPoint fPoints[kMaxPoints];
- SkPath::Verb fVerbs[kMaxVerbs];
- void clipMonoQuad(const SkPoint srcPts[3], const SkRect& clip);
- void clipMonoCubic(const SkPoint srcPts[4], const SkRect& clip);
- void appendVLine(SkScalar x, SkScalar y0, SkScalar y1, bool reverse);
- void appendQuad(const SkPoint pts[3], bool reverse);
- void appendCubic(const SkPoint pts[4], bool reverse);
- };
- #ifdef SK_DEBUG
- void sk_assert_monotonic_x(const SkPoint pts[], int count);
- void sk_assert_monotonic_y(const SkPoint pts[], int count);
- #else
- #define sk_assert_monotonic_x(pts, count)
- #define sk_assert_monotonic_y(pts, count)
- #endif
- #endif
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