blob: 6720b9c44270807cbc65b55eb4c7e59ec880e413 [file] [log] [blame]
/*
* Copyright (C) 2009 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef SkEdgeClipper_DEFINED
#define SkEdgeClipper_DEFINED
#include "SkPath.h"
/** This is basically an iterator. It is initialized with an edge and a clip,
and then next() is called until it returns kDone_Verb.
*/
class SkEdgeClipper {
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