reed@google.com | d230e3e | 2011-12-05 20:49:37 +0000 | [diff] [blame] | 1 | /* |
| 2 | * Copyright 2011 Google Inc. |
| 3 | * |
| 4 | * Use of this source code is governed by a BSD-style license that can be |
| 5 | * found in the LICENSE file. |
| 6 | */ |
| 7 | |
| 8 | #include "Test.h" |
| 9 | #include "SkFloatingPoint.h" |
| 10 | #include "SkMath.h" |
| 11 | #include "SkPoint.h" |
| 12 | #include "SkRandom.h" |
| 13 | |
| 14 | #ifdef SK_CAN_USE_FLOAT |
| 15 | |
| 16 | static bool isFinite_int(float x) { |
| 17 | uint32_t bits = SkFloat2Bits(x); // need unsigned for our shifts |
| 18 | int exponent = bits << 1 >> 24; |
| 19 | return exponent != 0xFF; |
| 20 | } |
| 21 | |
| 22 | static bool isFinite_float(float x) { |
reed@google.com | 61873a5 | 2011-12-05 21:47:25 +0000 | [diff] [blame] | 23 | return sk_float_isfinite(x); |
reed@google.com | d230e3e | 2011-12-05 20:49:37 +0000 | [diff] [blame] | 24 | } |
| 25 | |
| 26 | static bool isFinite_mulzero(float x) { |
| 27 | float y = x * 0; |
| 28 | return y == y; |
| 29 | } |
| 30 | |
| 31 | // return true if the float is finite |
| 32 | typedef bool (*IsFiniteProc1)(float); |
| 33 | |
| 34 | static bool isFinite2_and(float x, float y, IsFiniteProc1 proc) { |
| 35 | return proc(x) && proc(y); |
| 36 | } |
| 37 | |
| 38 | static bool isFinite2_mulzeroadd(float x, float y, IsFiniteProc1 proc) { |
| 39 | return proc(x * 0 + y * 0); |
| 40 | } |
| 41 | |
| 42 | // return true if both floats are finite |
| 43 | typedef bool (*IsFiniteProc2)(float, float, IsFiniteProc1); |
| 44 | |
| 45 | #endif |
| 46 | |
reed@google.com | 5ae777d | 2011-12-06 20:18:05 +0000 | [diff] [blame] | 47 | enum FloatClass { |
| 48 | kFinite, |
| 49 | kInfinite, |
| 50 | kNaN |
| 51 | }; |
| 52 | |
| 53 | static void test_floatclass(skiatest::Reporter* reporter, float value, FloatClass fc) { |
| 54 | // our sk_float_is... function may return int instead of bool, |
| 55 | // hence the double ! to turn it into a bool |
| 56 | REPORTER_ASSERT(reporter, !!sk_float_isfinite(value) == (fc == kFinite)); |
| 57 | REPORTER_ASSERT(reporter, !!sk_float_isinf(value) == (fc == kInfinite)); |
| 58 | REPORTER_ASSERT(reporter, !!sk_float_isnan(value) == (fc == kNaN)); |
| 59 | } |
| 60 | |
reed@google.com | d230e3e | 2011-12-05 20:49:37 +0000 | [diff] [blame] | 61 | static void test_isfinite(skiatest::Reporter* reporter) { |
| 62 | #ifdef SK_CAN_USE_FLOAT |
| 63 | struct Rec { |
| 64 | float fValue; |
| 65 | bool fIsFinite; |
| 66 | }; |
| 67 | |
| 68 | float max = 3.402823466e+38f; |
| 69 | float inf = max * max; |
reed@google.com | 5ae777d | 2011-12-06 20:18:05 +0000 | [diff] [blame] | 70 | float nan = inf * 0; |
| 71 | |
| 72 | test_floatclass(reporter, 0, kFinite); |
| 73 | test_floatclass(reporter, max, kFinite); |
| 74 | test_floatclass(reporter, -max, kFinite); |
| 75 | test_floatclass(reporter, inf, kInfinite); |
| 76 | test_floatclass(reporter, -inf, kInfinite); |
| 77 | test_floatclass(reporter, nan, kNaN); |
| 78 | test_floatclass(reporter, -nan, kNaN); |
reed@google.com | d230e3e | 2011-12-05 20:49:37 +0000 | [diff] [blame] | 79 | |
| 80 | const Rec data[] = { |
| 81 | { 0, true }, |
| 82 | { 1, true }, |
| 83 | { -1, true }, |
| 84 | { max * 0.75, true }, |
| 85 | { max, true }, |
| 86 | { -max * 0.75, true }, |
| 87 | { -max, true }, |
| 88 | { inf, false }, |
| 89 | { -inf, false }, |
| 90 | { nan, false }, |
| 91 | }; |
| 92 | |
| 93 | const IsFiniteProc1 gProc1[] = { |
| 94 | isFinite_int, |
| 95 | isFinite_float, |
| 96 | isFinite_mulzero |
| 97 | }; |
| 98 | const IsFiniteProc2 gProc2[] = { |
| 99 | isFinite2_and, |
| 100 | isFinite2_mulzeroadd |
| 101 | }; |
| 102 | |
| 103 | int i, n = SK_ARRAY_COUNT(data); |
| 104 | |
| 105 | for (i = 0; i < n; ++i) { |
| 106 | for (int k = 0; k < SK_ARRAY_COUNT(gProc1); ++k) { |
| 107 | const Rec& rec = data[i]; |
| 108 | bool finite = gProc1[k](rec.fValue); |
| 109 | REPORTER_ASSERT(reporter, rec.fIsFinite == finite); |
| 110 | } |
| 111 | } |
| 112 | |
| 113 | for (i = 0; i < n; ++i) { |
| 114 | const Rec& rec0 = data[i]; |
| 115 | for (int j = 0; j < n; ++j) { |
| 116 | const Rec& rec1 = data[j]; |
| 117 | for (int k = 0; k < SK_ARRAY_COUNT(gProc1); ++k) { |
| 118 | IsFiniteProc1 proc1 = gProc1[k]; |
| 119 | |
| 120 | for (int m = 0; m < SK_ARRAY_COUNT(gProc2); ++m) { |
| 121 | bool finite = gProc2[m](rec0.fValue, rec1.fValue, proc1); |
| 122 | bool finite2 = rec0.fIsFinite && rec1.fIsFinite; |
| 123 | REPORTER_ASSERT(reporter, finite2 == finite); |
| 124 | } |
| 125 | } |
| 126 | } |
| 127 | } |
| 128 | #endif |
| 129 | } |
| 130 | |
| 131 | static void TestScalar(skiatest::Reporter* reporter) { |
| 132 | test_isfinite(reporter); |
| 133 | } |
| 134 | |
| 135 | #include "TestClassDef.h" |
| 136 | DEFINE_TESTCLASS("Scalar", TestScalarClass, TestScalar) |
| 137 | |