| Flutter Impeller |

geometry_asserts.h
Go to the documentation of this file.
1 // Copyright 2013 The Flutter Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4
5 #ifndef FLUTTER_IMPELLER_GEOMETRY_GEOMETRY_ASSERTS_H_
6 #define FLUTTER_IMPELLER_GEOMETRY_GEOMETRY_ASSERTS_H_
7
8 #include <array>
9 #include <iostream>
10
11 #include "gtest/gtest.h"
12 #include "impeller/geometry/matrix.h"
13 #include "impeller/geometry/point.h"
14 #include "impeller/geometry/rect.h"
15 #include "impeller/geometry/size.h"
16 #include "impeller/geometry/vector.h"
17
18 inline bool NumberNear(double a, double b) {
19 if (a == b) {
20 return true;
21 }
22 if (std::isnan(a) || std::isnan(b)) {
23 return false;
24 }
25
26 // We used to compare based on an absolute difference of 1e-3 which
27 // would allow up to 10 bits of mantissa difference in a float
28 // (leaving 14 bits of accuracy being tested). Some numbers in the tests
29 // will fail with a bit difference of up to 19 (a little over 4 bits) even
30 // though the numbers print out identically using the float ostream output
31 // at the default output precision. Choosing a max "units of least precision"
32 // of 32 allows up to 5 bits of imprecision.
33 static constexpr float kImpellerTestingMaxULP = 32;
34
35 // We also impose a minimum step size so that cases of comparing numbers
36 // very close to 0.0 don't compute a huge number of ULPs due to the ever
37 // increasing precision near 0. This value is approximately the step size
38 // of numbers going less than 1.0f.
39 static constexpr float kMinimumULPStep = (1.0f / (1 << 24));
40
41 auto adjust_step = [](float v) {
42 return (std::abs(v) < kMinimumULPStep) ? std::copysignf(kMinimumULPStep, v)
43 : v;
44 };
45
46 float step_ab = adjust_step(a - std::nexttowardf(a, b));
47 float step_ba = adjust_step(b - std::nexttowardf(b, a));
48
49 float ab_ulps = (a - b) / step_ab;
50 float ba_ulps = (b - a) / step_ba;
51 FML_CHECK(ab_ulps >= 0 && ba_ulps >= 0);
52
53 return (std::min(ab_ulps, ba_ulps) < kImpellerTestingMaxULP);
54 }
55
56 inline ::testing::AssertionResult MatrixNear(impeller::Matrix a,
57 impeller::Matrix b) {
58 auto equal = NumberNear(a.m[0], b.m[0]) //
59 && NumberNear(a.m[1], b.m[1]) //
60 && NumberNear(a.m[2], b.m[2]) //
61 && NumberNear(a.m[3], b.m[3]) //
62 && NumberNear(a.m[4], b.m[4]) //
63 && NumberNear(a.m[5], b.m[5]) //
64 && NumberNear(a.m[6], b.m[6]) //
65 && NumberNear(a.m[7], b.m[7]) //
66 && NumberNear(a.m[8], b.m[8]) //
67 && NumberNear(a.m[9], b.m[9]) //
68 && NumberNear(a.m[10], b.m[10]) //
69 && NumberNear(a.m[11], b.m[11]) //
70 && NumberNear(a.m[12], b.m[12]) //
71 && NumberNear(a.m[13], b.m[13]) //
72 && NumberNear(a.m[14], b.m[14]) //
73 && NumberNear(a.m[15], b.m[15]);
74
75 return equal ? ::testing::AssertionSuccess()
76 : ::testing::AssertionFailure()
77 << "Matrixes are not equal " << a << " " << b;
78 }
79
80 inline ::testing::AssertionResult QuaternionNear(impeller::Quaternion a,
81 impeller::Quaternion b) {
82 auto equal = NumberNear(a.x, b.x) && NumberNear(a.y, b.y) &&
83 NumberNear(a.z, b.z) && NumberNear(a.w, b.w);
84
85 return equal ? ::testing::AssertionSuccess()
86 : ::testing::AssertionFailure() << "Quaternions are not equal.";
87 }
88
89 inline ::testing::AssertionResult RectNear(impeller::Rect a, impeller::Rect b) {
90 auto equal = NumberNear(a.GetLeft(), b.GetLeft()) &&
91 NumberNear(a.GetTop(), b.GetTop()) &&
92 NumberNear(a.GetRight(), b.GetRight()) &&
93 NumberNear(a.GetBottom(), b.GetBottom());
94
95 return equal ? ::testing::AssertionSuccess()
96 : ::testing::AssertionFailure()
97 << "Rects are not equal (" << a << " " << b << ")";
98 }
99
100 inline ::testing::AssertionResult ColorNear(impeller::Color a,
101 impeller::Color b) {
102 auto equal = NumberNear(a.red, b.red) && NumberNear(a.green, b.green) &&
103 NumberNear(a.blue, b.blue) && NumberNear(a.alpha, b.alpha);
104
105 return equal ? ::testing::AssertionSuccess()
106 : ::testing::AssertionFailure() << "Colors are not equal.";
107 }
108
109 inline ::testing::AssertionResult PointNear(impeller::Point a,
110 impeller::Point b) {
111 auto equal = NumberNear(a.x, b.x) && NumberNear(a.y, b.y);
112
113 return equal ? ::testing::AssertionSuccess()
114 : ::testing::AssertionFailure()
115 << "Points are not equal (" << a << " " << b << ").";
116 }
117
118 inline ::testing::AssertionResult Vector3Near(impeller::Vector3 a,
119 impeller::Vector3 b) {
120 auto equal =
121 NumberNear(a.x, b.x) && NumberNear(a.y, b.y) && NumberNear(a.z, b.z);
122
123 return equal ? ::testing::AssertionSuccess()
124 : ::testing::AssertionFailure() << "Vector3s are not equal.";
125 }
126
127 inline ::testing::AssertionResult Vector4Near(impeller::Vector4 a,
128 impeller::Vector4 b) {
129 auto equal = NumberNear(a.x, b.x) && NumberNear(a.y, b.y) &&
130 NumberNear(a.z, b.z) && NumberNear(a.w, b.w);
131
132 return equal ? ::testing::AssertionSuccess()
133 : ::testing::AssertionFailure() << "Vector4s are not equal.";
134 }
135
136 inline ::testing::AssertionResult SizeNear(impeller::Size a, impeller::Size b) {
137 auto equal = NumberNear(a.width, b.width) && NumberNear(a.height, b.height);
138
139 return equal ? ::testing::AssertionSuccess()
140 : ::testing::AssertionFailure() << "Sizes are not equal.";
141 }
142
143 inline ::testing::AssertionResult Array4Near(std::array<uint8_t, 4> a,
144 std::array<uint8_t, 4> b) {
145 auto equal = NumberNear(a[0], b[0]) && NumberNear(a[1], b[1]) &&
146 NumberNear(a[2], b[2]) && NumberNear(a[3], b[3]);
147
148 return equal ? ::testing::AssertionSuccess()
149 : ::testing::AssertionFailure() << "Arrays are not equal.";
150 }
151
152 inline ::testing::AssertionResult ColorBufferNear(
153 std::vector<uint8_t> a,
154 std::vector<impeller::Color> b) {
155 if (a.size() != b.size() * 4) {
156 return ::testing::AssertionFailure()
157 << "Color buffer length does not match";
158 }
159 for (auto i = 0u; i < b.size(); i++) {
160 auto right = b[i].Premultiply().ToR8G8B8A8();
161 auto j = i * 4;
162 auto equal = NumberNear(a[j], right[0]) && NumberNear(a[j + 1], right[1]) &&
163 NumberNear(a[j + 2], right[2]) &&
164 NumberNear(a[j + 3], right[3]);
165 if (!equal) {
166 ::testing::AssertionFailure() << "Color buffers are not equal.";
167 }
168 }
169 return ::testing::AssertionSuccess();
170 }
171
172 inline ::testing::AssertionResult ColorsNear(std::vector<impeller::Color> a,
173 std::vector<impeller::Color> b) {
174 if (a.size() != b.size()) {
175 return ::testing::AssertionFailure() << "Colors length does not match";
176 }
177 for (auto i = 0u; i < b.size(); i++) {
178 auto equal =
179 NumberNear(a[i].red, b[i].red) && NumberNear(a[i].green, b[i].green) &&
180 NumberNear(a[i].blue, b[i].blue) && NumberNear(a[i].alpha, b[i].alpha);
181
182 if (!equal) {
183 ::testing::AssertionFailure() << "Colors are not equal.";
184 }
185 }
186 return ::testing::AssertionSuccess();
187 }
188
189 #define ASSERT_MATRIX_NEAR(a, b) ASSERT_PRED2(&::MatrixNear, a, b)
190 #define ASSERT_QUATERNION_NEAR(a, b) ASSERT_PRED2(&::QuaternionNear, a, b)
191 #define ASSERT_RECT_NEAR(a, b) ASSERT_PRED2(&::RectNear, a, b)
192 #define ASSERT_COLOR_NEAR(a, b) ASSERT_PRED2(&::ColorNear, a, b)
193 #define ASSERT_POINT_NEAR(a, b) ASSERT_PRED2(&::PointNear, a, b)
194 #define ASSERT_VECTOR3_NEAR(a, b) ASSERT_PRED2(&::Vector3Near, a, b)
195 #define ASSERT_VECTOR4_NEAR(a, b) ASSERT_PRED2(&::Vector4Near, a, b)
196 #define ASSERT_SIZE_NEAR(a, b) ASSERT_PRED2(&::SizeNear, a, b)
197 #define ASSERT_ARRAY_4_NEAR(a, b) ASSERT_PRED2(&::Array4Near, a, b)
198 #define ASSERT_COLOR_BUFFER_NEAR(a, b) ASSERT_PRED2(&::ColorBufferNear, a, b)
199 #define ASSERT_COLORS_NEAR(a, b) ASSERT_PRED2(&::ColorsNear, a, b)
200
201 #define EXPECT_MATRIX_NEAR(a, b) EXPECT_PRED2(&::MatrixNear, a, b)
202 #define EXPECT_QUATERNION_NEAR(a, b) EXPECT_PRED2(&::QuaternionNear, a, b)
203 #define EXPECT_RECT_NEAR(a, b) EXPECT_PRED2(&::RectNear, a, b)
204 #define EXPECT_COLOR_NEAR(a, b) EXPECT_PRED2(&::ColorNear, a, b)
205 #define EXPECT_POINT_NEAR(a, b) EXPECT_PRED2(&::PointNear, a, b)
206 #define EXPECT_VECTOR3_NEAR(a, b) EXPECT_PRED2(&::Vector3Near, a, b)
207 #define EXPECT_VECTOR4_NEAR(a, b) EXPECT_PRED2(&::Vector4Near, a, b)
208 #define EXPECT_SIZE_NEAR(a, b) EXPECT_PRED2(&::SizeNear, a, b)
209 #define EXPECT_ARRAY_4_NEAR(a, b) EXPECT_PRED2(&::Array4Near, a, b)
210 #define EXPECT_COLOR_BUFFER_NEAR(a, b) EXPECT_PRED2(&::ColorBufferNear, a, b)
211 #define EXPECT_COLORS_NEAR(a, b) EXPECT_PRED2(&::ColorsNear, a, b)
212
213 #endif // FLUTTER_IMPELLER_GEOMETRY_GEOMETRY_ASSERTS_H_
impeller::Matrix::m
Scalar m[16]
Definition: matrix.h:39
NumberNear
bool NumberNear(double a, double b)
Definition: geometry_asserts.h:18
impeller::Quaternion::z
Scalar z
Definition: quaternion.h:19
point.h
impeller::TPoint::y
Type y
Definition: point.h:31
impeller::Quaternion::w
Scalar w
Definition: quaternion.h:20
impeller::Color
Definition: color.h:123
impeller::Vector4
Definition: vector.h:232
MatrixNear
inline ::testing::AssertionResult MatrixNear(impeller::Matrix a, impeller::Matrix b)
Definition: geometry_asserts.h:56
impeller::Color::alpha
Scalar alpha
Definition: color.h:142
ColorNear
inline ::testing::AssertionResult ColorNear(impeller::Color a, impeller::Color b)
Definition: geometry_asserts.h:100
Array4Near
inline ::testing::AssertionResult Array4Near(std::array< uint8_t, 4 > a, std::array< uint8_t, 4 > b)
Definition: geometry_asserts.h:143
impeller::Color::green
Scalar green
Definition: color.h:132
impeller::Vector3::x
Scalar x
Definition: vector.h:23
impeller::Quaternion::x
Scalar x
Definition: quaternion.h:17
matrix.h
impeller::TSize< Scalar >
impeller::Quaternion
Definition: quaternion.h:14
impeller::TRect::GetLeft
constexpr auto GetLeft() const
Definition: rect.h:355
Vector3Near
inline ::testing::AssertionResult Vector3Near(impeller::Vector3 a, impeller::Vector3 b)
Definition: geometry_asserts.h:118
impeller::Color::red
Scalar red
Definition: color.h:127
ColorBufferNear
inline ::testing::AssertionResult ColorBufferNear(std::vector< uint8_t > a, std::vector< impeller::Color > b)
Definition: geometry_asserts.h:152
impeller::Vector3::z
Scalar z
Definition: vector.h:25
impeller::Vector4::x
Scalar x
Definition: vector.h:235
PointNear
inline ::testing::AssertionResult PointNear(impeller::Point a, impeller::Point b)
Definition: geometry_asserts.h:109
impeller::Vector3::y
Scalar y
Definition: vector.h:24
QuaternionNear
inline ::testing::AssertionResult QuaternionNear(impeller::Quaternion a, impeller::Quaternion b)
Definition: geometry_asserts.h:80
ColorsNear
inline ::testing::AssertionResult ColorsNear(std::vector< impeller::Color > a, std::vector< impeller::Color > b)
Definition: geometry_asserts.h:172
impeller::TSize::width
Type width
Definition: size.h:28
impeller::TPoint::x
Type x
Definition: point.h:30
impeller::Vector4::w
Scalar w
Definition: vector.h:238
impeller::TRect::GetRight
constexpr auto GetRight() const
Definition: rect.h:359
vector.h
RectNear
inline ::testing::AssertionResult RectNear(impeller::Rect a, impeller::Rect b)
Definition: geometry_asserts.h:89
impeller::Vector4::y
Scalar y
Definition: vector.h:236
rect.h
impeller::TPoint< Scalar >
impeller::saturated::b
SI b
Definition: saturated_math.h:87
Vector4Near
inline ::testing::AssertionResult Vector4Near(impeller::Vector4 a, impeller::Vector4 b)
Definition: geometry_asserts.h:127
impeller::Quaternion::y
Scalar y
Definition: quaternion.h:18
impeller::TRect::GetBottom
constexpr auto GetBottom() const
Definition: rect.h:361
impeller::TSize::height
Type height
Definition: size.h:29
impeller::Color::blue
Scalar blue
Definition: color.h:137
impeller::Vector4::z
Scalar z
Definition: vector.h:237
impeller::TRect::GetTop
constexpr auto GetTop() const
Definition: rect.h:357
impeller::TRect< Scalar >
impeller::Matrix
A 4x4 matrix using column-major storage.
Definition: matrix.h:37
impeller::Vector3
Definition: vector.h:20
size.h
SizeNear
inline ::testing::AssertionResult SizeNear(impeller::Size a, impeller::Size b)
Definition: geometry_asserts.h:136