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rstransform_unittests.cc
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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 #include "gtest/gtest.h"
6
7 #include "flutter/impeller/geometry/rstransform.h"
8
9 #include "flutter/impeller/geometry/geometry_asserts.h"
10
11 namespace impeller {
12 namespace testing {
13
14 TEST(RSTransformTest, Construction) {
15 RSTransform transform = RSTransform::Make({10.0f, 12.0f}, 2.0f, Degrees(90));
16
17 EXPECT_EQ(transform.scaled_cos, 0.0f);
18 EXPECT_EQ(transform.scaled_sin, 2.0f);
19 EXPECT_EQ(transform.translate_x, 10.0f);
20 EXPECT_EQ(transform.translate_y, 12.0f);
21
22 EXPECT_EQ(transform.GetBounds(20.0f, 30.0f),
23 // relative corners are at
24 // 0, 0
25 // 0, 40
26 // -60, 0
27 // -60, 40
28 // then add 10, 12 to all values
29 Rect::MakeLTRB(10 + -2 * 30, 12 + 0, 10 + 0, 12 + 40));
30 }
31
32 TEST(RSTransformTest, CompareToMatrix) {
33 for (int tx = 0; tx <= 100; tx += 10) {
34 for (int ty = 0; ty <= 100; ty += 10) {
35 Point origin(tx, ty);
36 for (int scale = 1; scale <= 20; scale += 5) {
37 // Overshoot a full circle by 30 degrees
38 for (int degrees = 0; degrees <= 390; degrees += 45) {
39 auto matrix = Matrix::MakeTranslation(origin) *
40 Matrix::MakeRotationZ(Degrees(degrees)) *
41 Matrix::MakeScale(Vector2(scale, scale));
42 auto rst = RSTransform::Make(origin, scale, Degrees(degrees));
43 EXPECT_MATRIX_NEAR(rst.GetMatrix(), matrix);
44 for (int w = 10; w <= 100; w += 10) {
45 for (int h = 10; h <= 100; h += 10) {
46 Quad q = rst.GetQuad(w, h);
47 auto points = Rect::MakeWH(w, h).GetTransformedPoints(matrix);
48 for (int i = 0; i < 4; i++) {
49 EXPECT_NEAR(q[i].x, points[i].x, kEhCloseEnough);
50 EXPECT_NEAR(q[i].y, points[i].y, kEhCloseEnough);
51 }
52 }
53 }
54 }
55 }
56 }
57 }
58 }
59
60 } // namespace testing
61 } // namespace impeller
x
int32_t x
Definition: dl_golden_unittests.cc:443
transform
Matrix transform
Definition: gaussian_blur_filter_contents.cc:214
geometry_asserts.h
EXPECT_MATRIX_NEAR
#define EXPECT_MATRIX_NEAR(a, b)
Definition: geometry_asserts.h:201
impeller::testing::TEST
TEST(AllocationSizeTest, CanCreateTypedAllocations)
Definition: allocation_size_unittests.cc:10
impeller
Definition: allocation.cc:12
impeller::Vector2
Point Vector2
Definition: point.h:331
impeller::kEhCloseEnough
constexpr float kEhCloseEnough
Definition: constants.h:56
impeller::Quad
std::array< Point, 4 > Quad
Definition: point.h:332
rstransform.h
scale
const Scalar scale
Definition: stroke_path_geometry.cc:316
impeller::Degrees
Definition: scalar.h:51
impeller::Matrix::MakeTranslation
static constexpr Matrix MakeTranslation(const Vector3 &t)
Definition: matrix.h:95
impeller::Matrix::MakeRotationZ
static Matrix MakeRotationZ(Radians r)
Definition: matrix.h:223
impeller::Matrix::MakeScale
static constexpr Matrix MakeScale(const Vector3 &s)
Definition: matrix.h:104
impeller::RSTransform
Definition: rstransform.h:20
impeller::RSTransform::Make
static constexpr RSTransform Make(Point origin, Scalar scale, Radians radians)
Definition: rstransform.h:38
impeller::TPoint< Scalar >
impeller::TRect< Scalar >::MakeWH
constexpr static TRect MakeWH(Type width, Type height)
Definition: rect.h:140
impeller::TRect::GetTransformedPoints
constexpr std::array< TPoint< T >, 4 > GetTransformedPoints(const Matrix &transform) const
Definition: rect.h:430
impeller::TRect< Scalar >::MakeLTRB
constexpr static TRect MakeLTRB(Type left, Type top, Type right, Type bottom)
Definition: rect.h:129