InfRectTest.cpp revision 2b57dc6bb241a6627c4375ee54b73039983d03da 
1
2/*
3 * Copyright 2011 Google Inc.
4 *
5 * Use of this source code is governed by a BSD-style license that can be
6 * found in the LICENSE file.
7 */
8#include "Test.h"
9#include "SkRandom.h"
10#include "SkRect.h"
11
12#ifdef SK_SCALAR_IS_FLOAT
13static float make_zero() {
14    return sk_float_sin(0);
15}
16#endif
17
18struct RectCenter {
19    SkIRect  fRect;
20    SkIPoint fCenter;
21};
22
23static void test_center(skiatest::Reporter* reporter) {
24    static const RectCenter gData[] = {
25        { { 0, 0, 0, 0 }, { 0, 0 } },
26        { { 0, 0, 1, 1 }, { 0, 0 } },
27        { { -1, -1, 0, 0 }, { -1, -1 } },
28        { { 0, 0, 10, 7 }, { 5, 3 } },
29        { { 0, 0, 11, 6 }, { 5, 3 } },
30    };
31    for (size_t index = 0; index < SK_ARRAY_COUNT(gData); ++index) {
32        REPORTER_ASSERT(reporter,
33                        gData[index].fRect.centerX() == gData[index].fCenter.x());
34        REPORTER_ASSERT(reporter,
35                        gData[index].fRect.centerY() == gData[index].fCenter.y());
36    }
37
38    SkRandom rand;
39    for (int i = 0; i < 10000; ++i) {
40        SkIRect r;
41
42        r.set(rand.nextS() >> 2, rand.nextS() >> 2,
43              rand.nextS() >> 2, rand.nextS() >> 2);
44        int cx = r.centerX();
45        int cy = r.centerY();
46        REPORTER_ASSERT(reporter, ((r.left() + r.right()) >> 1) == cx);
47        REPORTER_ASSERT(reporter, ((r.top() + r.bottom()) >> 1) == cy);
48    }
49}
50
51static void check_invalid(skiatest::Reporter* reporter,
52                          SkScalar l, SkScalar t, SkScalar r, SkScalar b) {
53    SkRect rect;
54    rect.set(l, t, r, b);
55    REPORTER_ASSERT(reporter, !rect.isFinite());
56}
57
58// Tests that isFinite() will reject any rect with +/-inf values
59// as one of its coordinates.
60static void TestInfRect(skiatest::Reporter* reporter) {
61#ifdef SK_SCALAR_IS_FLOAT
62    float inf = 1 / make_zero();    // infinity
63    float nan = inf * 0;
64    SkASSERT(!(nan == nan));
65#else
66    SkFixed inf = SK_FixedNaN;
67    SkFixed nan = SK_FixedNaN;
68#endif
69    SkScalar small = SkIntToScalar(10);
70    SkScalar big = SkIntToScalar(100);
71
72    REPORTER_ASSERT(reporter, SkRect::MakeEmpty().isFinite());
73
74    SkRect rect = SkRect::MakeXYWH(small, small, big, big);
75    REPORTER_ASSERT(reporter, rect.isFinite());
76
77    const SkScalar invalid[] = { nan, inf, -inf };
78    for (size_t i = 0; i < SK_ARRAY_COUNT(invalid); ++i) {
79        check_invalid(reporter, small, small, big, invalid[i]);
80        check_invalid(reporter, small, small, invalid[i], big);
81        check_invalid(reporter, small, invalid[i], big, big);
82        check_invalid(reporter, invalid[i], small, big, big);
83    }
84
85    test_center(reporter);
86}
87
88// need tests for SkStrSearch
89
90#include "TestClassDef.h"
91DEFINE_TESTCLASS("InfRect", InfRectTestClass, TestInfRect)
92