aboutsummaryrefslogtreecommitdiffhomepage
path: root/tests/PathOpsQuadLineIntersectionTest.cpp
blob: a7894430bc05fa19340c202c3c33c10530d61b6d (plain)
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
/*
 * 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 "PathOpsExtendedTest.h"
#include "PathOpsTestCommon.h"
#include "SkIntersections.h"
#include "SkPathOpsLine.h"
#include "SkPathOpsQuad.h"
#include "SkReduceOrder.h"
#include "Test.h"

static struct lineQuad {
    SkDQuad quad;
    SkDLine line;
    int result;
    SkDPoint expected[2];
} lineQuadTests[] = {
    //        quad                    line                  results
    {{{{1, 1}, {2, 1}, {0, 2}}}, {{{0, 0}, {1, 1}}},  1,  {{1, 1}, {0, 0}} },
    {{{{0, 0}, {1, 1}, {3, 1}}}, {{{0, 0}, {3, 1}}},  2,  {{0, 0}, {3, 1}} },
    {{{{2, 0}, {1, 1}, {2, 2}}}, {{{0, 0}, {0, 2}}},  0,  {{0, 0}, {0, 0}} },
    {{{{4, 0}, {0, 1}, {4, 2}}}, {{{3, 1}, {4, 1}}},  0,  {{0, 0}, {0, 0}} },
    {{{{0, 0}, {0, 1}, {1, 1}}}, {{{0, 1}, {1, 0}}},  1,  {{.25, .75}, {0, 0}} },
};

static size_t lineQuadTests_count = SK_ARRAY_COUNT(lineQuadTests);

static int doIntersect(SkIntersections& intersections, const SkDQuad& quad, const SkDLine& line,
                       bool& flipped) {
    int result;
    flipped = false;
    if (line[0].fX == line[1].fX) {
        double top = line[0].fY;
        double bottom = line[1].fY;
        flipped = top > bottom;
        if (flipped) {
            SkTSwap<double>(top, bottom);
        }
        result = intersections.vertical(quad, top, bottom, line[0].fX, flipped);
    } else if (line[0].fY == line[1].fY) {
        double left = line[0].fX;
        double right = line[1].fX;
        flipped = left > right;
        if (flipped) {
            SkTSwap<double>(left, right);
        }
        result = intersections.horizontal(quad, left, right, line[0].fY, flipped);
    } else {
        intersections.intersect(quad, line);
        result = intersections.used();
    }
    return result;
}

static struct oneLineQuad {
    SkDQuad quad;
    SkDLine line;
} oneOffs[] = {
    {{{{447.96701049804687, 894.4381103515625}, {448.007080078125, 894.4239501953125},
       {448.0140380859375, 894.4215087890625}}},
     {{{490.43548583984375, 879.40740966796875}, {405.59262084960937, 909.435546875}}}},
    {{{{142.589081, 102.283646}, {149.821579, 100}, {158, 100}}},
        {{{90, 230}, {160, 60}}}},
    {{{{1101, 10}, {1101, 8.3431453704833984}, {1099.828857421875, 7.1711997985839844}}},
        {{{1099.828857421875,7.1711711883544922}, {1099.121337890625,7.8786783218383789}}}},
    {{{{973, 507}, {973, 508.24264526367187}, {972.12158203125, 509.12161254882812}}},
        {{{930, 467}, {973, 510}}}},
    {{{{369.848602, 145.680267}, {382.360413, 121.298294}, {406.207703, 121.298294}}},
        {{{406.207703, 121.298294}, {348.781738, 123.864815}}}},
};

static size_t oneOffs_count = SK_ARRAY_COUNT(oneOffs);

static void testOneOffs(skiatest::Reporter* reporter) {
    bool flipped = false;
    for (size_t index = 0; index < oneOffs_count; ++index) {
        const SkDQuad& quad = oneOffs[index].quad;
        SkASSERT(ValidQuad(quad));
        const SkDLine& line = oneOffs[index].line;
        SkASSERT(ValidLine(line));
        SkIntersections intersections;
        int result = doIntersect(intersections, quad, line, flipped);
        for (int inner = 0; inner < result; ++inner) {
            double quadT = intersections[0][inner];
            SkDPoint quadXY = quad.ptAtT(quadT);
            double lineT = intersections[1][inner];
            SkDPoint lineXY = line.ptAtT(lineT);
            if (!quadXY.approximatelyEqual(lineXY)) {
                quadXY.approximatelyEqual(lineXY);
                SkDebugf("");
            }
            REPORTER_ASSERT(reporter, quadXY.approximatelyEqual(lineXY));
        }
    }
}

DEF_TEST(PathOpsQuadLineIntersectionOneOff, reporter) {
    testOneOffs(reporter);
}

DEF_TEST(PathOpsQuadLineIntersection, reporter) {
    for (size_t index = 0; index < lineQuadTests_count; ++index) {
        int iIndex = static_cast<int>(index);
        const SkDQuad& quad = lineQuadTests[index].quad;
        SkASSERT(ValidQuad(quad));
        const SkDLine& line = lineQuadTests[index].line;
        SkASSERT(ValidLine(line));
        SkReduceOrder reducer1, reducer2;
        int order1 = reducer1.reduce(quad);
        int order2 = reducer2.reduce(line);
        if (order1 < 3) {
            SkDebugf("%s [%d] quad order=%d\n", __FUNCTION__, iIndex, order1);
            REPORTER_ASSERT(reporter, 0);
        }
        if (order2 < 2) {
            SkDebugf("%s [%d] line order=%d\n", __FUNCTION__, iIndex, order2);
            REPORTER_ASSERT(reporter, 0);
        }
        SkIntersections intersections;
        bool flipped = false;
        int result = doIntersect(intersections, quad, line, flipped);
        REPORTER_ASSERT(reporter, result == lineQuadTests[index].result);
        if (intersections.used() <= 0) {
            continue;
        }
        for (int pt = 0; pt < result; ++pt) {
            double tt1 = intersections[0][pt];
            REPORTER_ASSERT(reporter, tt1 >= 0 && tt1 <= 1);
            SkDPoint t1 = quad.ptAtT(tt1);
            double tt2 = intersections[1][pt];
            REPORTER_ASSERT(reporter, tt2 >= 0 && tt2 <= 1);
            SkDPoint t2 = line.ptAtT(tt2);
            if (!t1.approximatelyEqual(t2)) {
                SkDebugf("%s [%d,%d] x!= t1=%1.9g (%1.9g,%1.9g) t2=%1.9g (%1.9g,%1.9g)\n",
                    __FUNCTION__, iIndex, pt, tt1, t1.fX, t1.fY, tt2, t2.fX, t2.fY);
                REPORTER_ASSERT(reporter, 0);
            }
            if (!t1.approximatelyEqual(lineQuadTests[index].expected[0])
                    && (lineQuadTests[index].result == 1
                    || !t1.approximatelyEqual(lineQuadTests[index].expected[1]))) {
                SkDebugf("%s t1=(%1.9g,%1.9g)\n", __FUNCTION__, t1.fX, t1.fY);
                REPORTER_ASSERT(reporter, 0);
            }
        }
    }
}