1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
|
/*
* Copyright 2012 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "SkIntersections.h"
int (SkIntersections::*CurveVertical[])(const SkPoint[], SkScalar, SkScalar, SkScalar, bool) = {
NULL,
&SkIntersections::verticalLine,
&SkIntersections::verticalQuad,
&SkIntersections::verticalCubic
};
int (SkIntersections::*CurveRay[])(const SkPoint[], const SkDLine&) = {
NULL,
NULL,
&SkIntersections::quadRay,
&SkIntersections::cubicRay
};
int SkIntersections::coincidentUsed() const {
if (!fIsCoincident[0]) {
SkASSERT(!fIsCoincident[1]);
return 0;
}
int count = 0;
SkDEBUGCODE(int count2 = 0;)
for (int index = 0; index < fUsed; ++index) {
if (fIsCoincident[0] & (1 << index)) {
++count;
}
#ifdef SK_DEBUG
if (fIsCoincident[1] & (1 << index)) {
++count2;
}
#endif
}
SkASSERT(count == count2);
return count;
}
int SkIntersections::cubicRay(const SkPoint pts[4], const SkDLine& line) {
SkDCubic cubic;
cubic.set(pts);
return intersectRay(cubic, line);
}
void SkIntersections::flip() {
for (int index = 0; index < fUsed; ++index) {
fT[1][index] = 1 - fT[1][index];
}
}
int SkIntersections::insert(double one, double two, const SkDPoint& pt) {
if (fIsCoincident[0] == 3 && between(fT[0][0], one, fT[0][1])) {
// For now, don't allow a mix of coincident and non-coincident intersections
return -1;
}
SkASSERT(fUsed <= 1 || fT[0][0] <= fT[0][1]);
int index;
for (index = 0; index < fUsed; ++index) {
double oldOne = fT[0][index];
double oldTwo = fT[1][index];
if (one == oldOne && two == oldTwo) {
return -1;
}
if (more_roughly_equal(oldOne, one) && more_roughly_equal(oldTwo, two)) {
if ((precisely_zero(one) && !precisely_zero(oldOne))
|| (precisely_equal(one, 1) && !precisely_equal(oldOne, 1))
|| (precisely_zero(two) && !precisely_zero(oldTwo))
|| (precisely_equal(two, 1) && !precisely_equal(oldTwo, 1))) {
fT[0][index] = one;
fT[1][index] = two;
fPt[index] = pt;
}
return -1;
}
#if ONE_OFF_DEBUG
if (pt.roughlyEqual(fPt[index])) {
SkDebugf("%s t=%1.9g pts roughly equal\n", __FUNCTION__, one);
}
#endif
if (fT[0][index] > one) {
break;
}
}
SkASSERT(fUsed < 9);
int remaining = fUsed - index;
if (remaining > 0) {
memmove(&fPt[index + 1], &fPt[index], sizeof(fPt[0]) * remaining);
memmove(&fT[0][index + 1], &fT[0][index], sizeof(fT[0][0]) * remaining);
memmove(&fT[1][index + 1], &fT[1][index], sizeof(fT[1][0]) * remaining);
fIsCoincident[0] += fIsCoincident[0] & ~((1 << index) - 1);
fIsCoincident[1] += fIsCoincident[1] & ~((1 << index) - 1);
}
fPt[index] = pt;
fT[0][index] = one;
fT[1][index] = two;
++fUsed;
return index;
}
void SkIntersections::insertCoincident(double one, double two, const SkDPoint& pt) {
int index = insertSwap(one, two, pt);
int bit = 1 << index;
fIsCoincident[0] |= bit;
fIsCoincident[1] |= bit;
}
void SkIntersections::offset(int base, double start, double end) {
for (int index = base; index < fUsed; ++index) {
double val = fT[fSwap][index];
val *= end - start;
val += start;
fT[fSwap][index] = val;
}
}
int SkIntersections::quadRay(const SkPoint pts[3], const SkDLine& line) {
SkDQuad quad;
quad.set(pts);
return intersectRay(quad, line);
}
void SkIntersections::quickRemoveOne(int index, int replace) {
if (index < replace) {
fT[0][index] = fT[0][replace];
}
}
#if 0
void SkIntersections::remove(double one, double two, const SkDPoint& startPt,
const SkDPoint& endPt) {
for (int index = fUsed - 1; index >= 0; --index) {
if (!(fIsCoincident[0] & (1 << index)) && (between(one, fT[fSwap][index], two)
|| startPt.approximatelyEqual(fPt[index])
|| endPt.approximatelyEqual(fPt[index]))) {
SkASSERT(fUsed > 0);
removeOne(index);
}
}
}
#endif
void SkIntersections::removeOne(int index) {
int remaining = --fUsed - index;
if (remaining <= 0) {
return;
}
memmove(&fPt[index], &fPt[index + 1], sizeof(fPt[0]) * remaining);
memmove(&fT[0][index], &fT[0][index + 1], sizeof(fT[0][0]) * remaining);
memmove(&fT[1][index], &fT[1][index + 1], sizeof(fT[1][0]) * remaining);
SkASSERT(fIsCoincident[0] == 0);
int coBit = fIsCoincident[0] & (1 << index);
fIsCoincident[0] -= ((fIsCoincident[0] >> 1) & ~((1 << index) - 1)) + coBit;
SkASSERT(!(coBit ^ (fIsCoincident[1] & (1 << index))));
fIsCoincident[1] -= ((fIsCoincident[1] >> 1) & ~((1 << index) - 1)) + coBit;
}
void SkIntersections::swapPts() {
int index;
for (index = 0; index < fUsed; ++index) {
SkTSwap(fT[0][index], fT[1][index]);
}
}
int SkIntersections::verticalLine(const SkPoint a[2], SkScalar top, SkScalar bottom,
SkScalar x, bool flipped) {
SkDLine line;
line.set(a);
return vertical(line, top, bottom, x, flipped);
}
int SkIntersections::verticalQuad(const SkPoint a[3], SkScalar top, SkScalar bottom,
SkScalar x, bool flipped) {
SkDQuad quad;
quad.set(a);
return vertical(quad, top, bottom, x, flipped);
}
int SkIntersections::verticalCubic(const SkPoint a[4], SkScalar top, SkScalar bottom,
SkScalar x, bool flipped) {
SkDCubic cubic;
cubic.set(a);
return vertical(cubic, top, bottom, x, flipped);
}
|
