chromium/third_party/skia/src/pathops/SkPathOpsCubic.h

/*
 * Copyright 2012 Google Inc.
 *
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 */

#ifndef SkPathOpsCubic_DEFINED
#define SkPathOpsCubic_DEFINED

#include "include/core/SkPoint.h"
#include "include/core/SkScalar.h"
#include "include/core/SkTypes.h"
#include "include/private/base/SkDebug.h"
#include "include/private/base/SkMalloc.h"
#include "src/base/SkArenaAlloc.h"
#include "src/pathops/SkPathOpsDebug.h"
#include "src/pathops/SkPathOpsPoint.h"
#include "src/pathops/SkPathOpsTCurve.h"

class SkIntersections;
class SkOpGlobalState;
struct SkDConic;
struct SkDCubicPair;
struct SkDLine;
struct SkDQuad;
struct SkDRect;

struct SkDCubic { … };

/* Given the set [0, 1, 2, 3], and two of the four members, compute an XOR mask
   that computes the other two. Note that:

   one ^ two == 3 for (0, 3), (1, 2)
   one ^ two <  3 for (0, 1), (0, 2), (1, 3), (2, 3)
   3 - (one ^ two) is either 0, 1, or 2
   1 >> (3 - (one ^ two)) is either 0 or 1
thus:
   returned == 2 for (0, 3), (1, 2)
   returned == 3 for (0, 1), (0, 2), (1, 3), (2, 3)
given that:
   (0, 3) ^ 2 -> (2, 1)  (1, 2) ^ 2 -> (3, 0)
   (0, 1) ^ 3 -> (3, 2)  (0, 2) ^ 3 -> (3, 1)  (1, 3) ^ 3 -> (2, 0)  (2, 3) ^ 3 -> (1, 0)
*/
inline int other_two(int one, int two) { … }

struct SkDCubicPair { … };

class SkTCubic : public SkTCurve { … };

#endif