2 * Copyright 2011 Google Inc.
4 * Use of this source code is governed by a BSD-style license that can be
5 * found in the LICENSE file.
8 #include "SkMatrix44.h"
11 static bool nearly_equal_double(double a, double b) {
12 const double tolerance = 1e-7;
16 return diff <= tolerance;
19 static bool nearly_equal_mscalar(SkMScalar a, SkMScalar b) {
20 const SkMScalar tolerance = SK_MScalar1 / 200000;
22 return SkTAbs<SkMScalar>(a - b) <= tolerance;
25 static bool nearly_equal_scalar(SkScalar a, SkScalar b) {
26 const SkScalar tolerance = SK_Scalar1 / 200000;
27 return SkScalarAbs(a - b) <= tolerance;
30 template <typename T> void assert16(skiatest::Reporter* reporter, const T data[],
31 T m0, T m1, T m2, T m3,
32 T m4, T m5, T m6, T m7,
33 T m8, T m9, T m10, T m11,
34 T m12, T m13, T m14, T m15) {
35 REPORTER_ASSERT(reporter, data[0] == m0);
36 REPORTER_ASSERT(reporter, data[1] == m1);
37 REPORTER_ASSERT(reporter, data[2] == m2);
38 REPORTER_ASSERT(reporter, data[3] == m3);
40 REPORTER_ASSERT(reporter, data[4] == m4);
41 REPORTER_ASSERT(reporter, data[5] == m5);
42 REPORTER_ASSERT(reporter, data[6] == m6);
43 REPORTER_ASSERT(reporter, data[7] == m7);
45 REPORTER_ASSERT(reporter, data[8] == m8);
46 REPORTER_ASSERT(reporter, data[9] == m9);
47 REPORTER_ASSERT(reporter, data[10] == m10);
48 REPORTER_ASSERT(reporter, data[11] == m11);
50 REPORTER_ASSERT(reporter, data[12] == m12);
51 REPORTER_ASSERT(reporter, data[13] == m13);
52 REPORTER_ASSERT(reporter, data[14] == m14);
53 REPORTER_ASSERT(reporter, data[15] == m15);
56 static bool nearly_equal(const SkMatrix44& a, const SkMatrix44& b) {
57 for (int i = 0; i < 4; ++i) {
58 for (int j = 0; j < 4; ++j) {
59 if (!nearly_equal_mscalar(a.get(i, j), b.get(i, j))) {
60 SkDebugf("not equal %g %g\n", a.get(i, j), b.get(i, j));
68 static bool is_identity(const SkMatrix44& m) {
69 SkMatrix44 identity(SkMatrix44::kIdentity_Constructor);
70 return nearly_equal(m, identity);
73 ///////////////////////////////////////////////////////////////////////////////
74 static bool bits_isonly(int value, int mask) {
75 return 0 == (value & ~mask);
78 static void test_constructor(skiatest::Reporter* reporter) {
79 // Allocate a matrix on the heap
80 SkMatrix44* placeholderMatrix = new SkMatrix44(SkMatrix44::kUninitialized_Constructor);
81 SkAutoTDelete<SkMatrix44> deleteMe(placeholderMatrix);
83 for (int row = 0; row < 4; ++row) {
84 for (int col = 0; col < 4; ++col) {
85 placeholderMatrix->setDouble(row, col, row * col);
89 // Use placement-new syntax to trigger the constructor on top of the heap
90 // address we already initialized. This allows us to check that the
91 // constructor did avoid initializing the matrix contents.
92 SkMatrix44* testMatrix = new(placeholderMatrix) SkMatrix44(SkMatrix44::kUninitialized_Constructor);
93 REPORTER_ASSERT(reporter, testMatrix == placeholderMatrix);
94 REPORTER_ASSERT(reporter, !testMatrix->isIdentity());
95 for (int row = 0; row < 4; ++row) {
96 for (int col = 0; col < 4; ++col) {
97 REPORTER_ASSERT(reporter, nearly_equal_double(row * col, testMatrix->getDouble(row, col)));
101 // Verify that kIdentity_Constructor really does initialize to an identity matrix.
103 testMatrix = new(placeholderMatrix) SkMatrix44(SkMatrix44::kIdentity_Constructor);
104 REPORTER_ASSERT(reporter, testMatrix == placeholderMatrix);
105 REPORTER_ASSERT(reporter, testMatrix->isIdentity());
106 REPORTER_ASSERT(reporter, *testMatrix == SkMatrix44::I());
109 static void test_translate(skiatest::Reporter* reporter) {
110 SkMatrix44 mat(SkMatrix44::kUninitialized_Constructor);
111 SkMatrix44 inverse(SkMatrix44::kUninitialized_Constructor);
113 mat.setTranslate(0, 0, 0);
114 REPORTER_ASSERT(reporter, bits_isonly(mat.getType(), SkMatrix44::kIdentity_Mask));
115 mat.setTranslate(1, 2, 3);
116 REPORTER_ASSERT(reporter, bits_isonly(mat.getType(), SkMatrix44::kTranslate_Mask));
117 REPORTER_ASSERT(reporter, mat.invert(&inverse));
118 REPORTER_ASSERT(reporter, bits_isonly(inverse.getType(), SkMatrix44::kTranslate_Mask));
120 SkMatrix44 a(SkMatrix44::kUninitialized_Constructor);
121 SkMatrix44 b(SkMatrix44::kUninitialized_Constructor);
122 SkMatrix44 c(SkMatrix44::kUninitialized_Constructor);
123 a.set3x3(1, 2, 3, 4, 5, 6, 7, 8, 9);
124 b.setTranslate(10, 11, 12);
128 mat.preTranslate(10, 11, 12);
129 REPORTER_ASSERT(reporter, mat == c);
133 mat.postTranslate(10, 11, 12);
134 REPORTER_ASSERT(reporter, mat == c);
137 static void test_scale(skiatest::Reporter* reporter) {
138 SkMatrix44 mat(SkMatrix44::kUninitialized_Constructor);
139 SkMatrix44 inverse(SkMatrix44::kUninitialized_Constructor);
141 mat.setScale(1, 1, 1);
142 REPORTER_ASSERT(reporter, bits_isonly(mat.getType(), SkMatrix44::kIdentity_Mask));
143 mat.setScale(1, 2, 3);
144 REPORTER_ASSERT(reporter, bits_isonly(mat.getType(), SkMatrix44::kScale_Mask));
145 REPORTER_ASSERT(reporter, mat.invert(&inverse));
146 REPORTER_ASSERT(reporter, bits_isonly(inverse.getType(), SkMatrix44::kScale_Mask));
148 SkMatrix44 a(SkMatrix44::kUninitialized_Constructor);
149 SkMatrix44 b(SkMatrix44::kUninitialized_Constructor);
150 SkMatrix44 c(SkMatrix44::kUninitialized_Constructor);
151 a.set3x3(1, 2, 3, 4, 5, 6, 7, 8, 9);
152 b.setScale(10, 11, 12);
156 mat.preScale(10, 11, 12);
157 REPORTER_ASSERT(reporter, mat == c);
161 mat.postScale(10, 11, 12);
162 REPORTER_ASSERT(reporter, mat == c);
165 static void make_i(SkMatrix44* mat) { mat->setIdentity(); }
166 static void make_t(SkMatrix44* mat) { mat->setTranslate(1, 2, 3); }
167 static void make_s(SkMatrix44* mat) { mat->setScale(1, 2, 3); }
168 static void make_st(SkMatrix44* mat) {
169 mat->setScale(1, 2, 3);
170 mat->postTranslate(1, 2, 3);
172 static void make_a(SkMatrix44* mat) {
173 mat->setRotateDegreesAbout(1, 2, 3, 45);
175 static void make_p(SkMatrix44* mat) {
177 1, 2, 3, 4, 5, 6, 7, 8,
178 1, 2, 3, 4, 5, 6, 7, 8,
180 mat->setRowMajor(data);
183 typedef void (*Make44Proc)(SkMatrix44*);
185 static const Make44Proc gMakeProcs[] = {
186 make_i, make_t, make_s, make_st, make_a, make_p
189 static void test_map2(skiatest::Reporter* reporter, const SkMatrix44& mat) {
190 SkMScalar src2[] = { 1, 2 };
191 SkMScalar src4[] = { src2[0], src2[1], 0, 1 };
192 SkMScalar dstA[4], dstB[4];
194 for (int i = 0; i < 4; ++i) {
199 mat.map2(src2, 1, dstA);
200 mat.mapMScalars(src4, dstB);
202 for (int i = 0; i < 4; ++i) {
203 REPORTER_ASSERT(reporter, dstA[i] == dstB[i]);
207 static void test_map2(skiatest::Reporter* reporter) {
208 SkMatrix44 mat(SkMatrix44::kUninitialized_Constructor);
210 for (size_t i = 0; i < SK_ARRAY_COUNT(gMakeProcs); ++i) {
212 test_map2(reporter, mat);
216 static void test_gettype(skiatest::Reporter* reporter) {
217 SkMatrix44 matrix(SkMatrix44::kIdentity_Constructor);
219 REPORTER_ASSERT(reporter, matrix.isIdentity());
220 REPORTER_ASSERT(reporter, SkMatrix44::kIdentity_Mask == matrix.getType());
225 expectedMask = SkMatrix44::kScale_Mask;
226 REPORTER_ASSERT(reporter, matrix.getType() == expectedMask);
228 matrix.set(0, 3, 1); // translate-x
229 expectedMask |= SkMatrix44::kTranslate_Mask;
230 REPORTER_ASSERT(reporter, matrix.getType() == expectedMask);
233 expectedMask |= SkMatrix44::kAffine_Mask;
234 REPORTER_ASSERT(reporter, matrix.getType() == expectedMask);
237 REPORTER_ASSERT(reporter, matrix.getType() & SkMatrix44::kPerspective_Mask);
239 // ensure that negative zero is treated as zero
243 matrix.setTranslate(-dx, -dy, -dz);
244 REPORTER_ASSERT(reporter, matrix.isIdentity());
245 matrix.preTranslate(-dx, -dy, -dz);
246 REPORTER_ASSERT(reporter, matrix.isIdentity());
247 matrix.postTranslate(-dx, -dy, -dz);
248 REPORTER_ASSERT(reporter, matrix.isIdentity());
251 static void test_common_angles(skiatest::Reporter* reporter) {
252 SkMatrix44 rot(SkMatrix44::kUninitialized_Constructor);
253 // Test precision of rotation in common cases
254 int common_angles[] = { 0, 90, -90, 180, -180, 270, -270, 360, -360 };
255 for (int i = 0; i < 9; ++i) {
256 rot.setRotateDegreesAbout(0, 0, -1, SkIntToScalar(common_angles[i]));
258 SkMatrix rot3x3 = rot;
259 REPORTER_ASSERT(reporter, rot3x3.rectStaysRect());
263 static void test_concat(skiatest::Reporter* reporter) {
265 SkMatrix44 a(SkMatrix44::kUninitialized_Constructor);
266 SkMatrix44 b(SkMatrix44::kUninitialized_Constructor);
267 SkMatrix44 c(SkMatrix44::kUninitialized_Constructor);
268 SkMatrix44 d(SkMatrix44::kUninitialized_Constructor);
270 a.setTranslate(10, 10, 10);
283 REPORTER_ASSERT(reporter, d == c);
285 c.mapScalars(src, dst); c.mapScalars(src + 4, dst + 4);
286 for (i = 0; i < 3; ++i) {
287 REPORTER_ASSERT(reporter, 10 == dst[i]);
288 REPORTER_ASSERT(reporter, 12 == dst[i + 4]);
295 REPORTER_ASSERT(reporter, d == c);
297 c.mapScalars(src, dst); c.mapScalars(src + 4, dst + 4);
298 for (i = 0; i < 3; ++i) {
299 REPORTER_ASSERT(reporter, 20 == dst[i]);
300 REPORTER_ASSERT(reporter, 22 == dst[i + 4]);
304 static void test_determinant(skiatest::Reporter* reporter) {
305 SkMatrix44 a(SkMatrix44::kIdentity_Constructor);
306 REPORTER_ASSERT(reporter, nearly_equal_double(1, a.determinant()));
308 REPORTER_ASSERT(reporter, nearly_equal_double(2, a.determinant()));
309 SkMatrix44 b(SkMatrix44::kUninitialized_Constructor);
310 REPORTER_ASSERT(reporter, a.invert(&b));
311 REPORTER_ASSERT(reporter, nearly_equal_double(0.5, b.determinant()));
312 SkMatrix44 c = b = a;
315 REPORTER_ASSERT(reporter,
316 nearly_equal_double(a.determinant(),
320 REPORTER_ASSERT(reporter, nearly_equal_double(16, d.determinant()));
324 REPORTER_ASSERT(reporter, nearly_equal_double(32, e.determinant()));
326 REPORTER_ASSERT(reporter, nearly_equal_double(0, e.determinant()));
329 static void test_invert(skiatest::Reporter* reporter) {
330 SkMatrix44 inverse(SkMatrix44::kUninitialized_Constructor);
331 double inverseData[16];
333 SkMatrix44 identity(SkMatrix44::kIdentity_Constructor);
334 identity.invert(&inverse);
335 inverse.asRowMajord(inverseData);
336 assert16<double>(reporter, inverseData,
342 SkMatrix44 translation(SkMatrix44::kUninitialized_Constructor);
343 translation.setTranslate(2, 3, 4);
344 translation.invert(&inverse);
345 inverse.asRowMajord(inverseData);
346 assert16<double>(reporter, inverseData,
352 SkMatrix44 scale(SkMatrix44::kUninitialized_Constructor);
353 scale.setScale(2, 4, 8);
354 scale.invert(&inverse);
355 inverse.asRowMajord(inverseData);
356 assert16<double>(reporter, inverseData,
362 SkMatrix44 scaleTranslation(SkMatrix44::kUninitialized_Constructor);
363 scaleTranslation.setScale(10, 100, 1000);
364 scaleTranslation.preTranslate(2, 3, 4);
365 scaleTranslation.invert(&inverse);
366 inverse.asRowMajord(inverseData);
367 assert16<double>(reporter, inverseData,
373 SkMatrix44 rotation(SkMatrix44::kUninitialized_Constructor);
374 rotation.setRotateDegreesAbout(0, 0, 1, 90);
375 rotation.invert(&inverse);
376 SkMatrix44 expected(SkMatrix44::kUninitialized_Constructor);
377 double expectedInverseRotation[16] =
382 expected.setRowMajord(expectedInverseRotation);
383 REPORTER_ASSERT(reporter, nearly_equal(expected, inverse));
385 SkMatrix44 affine(SkMatrix44::kUninitialized_Constructor);
386 affine.setRotateDegreesAbout(0, 0, 1, 90);
387 affine.preScale(10, 20, 100);
388 affine.preTranslate(2, 3, 4);
389 affine.invert(&inverse);
390 double expectedInverseAffine[16] =
395 expected.setRowMajord(expectedInverseAffine);
396 REPORTER_ASSERT(reporter, nearly_equal(expected, inverse));
398 SkMatrix44 perspective(SkMatrix44::kIdentity_Constructor);
399 perspective.setDouble(3, 2, 1.0);
400 perspective.invert(&inverse);
401 double expectedInversePerspective[16] =
406 expected.setRowMajord(expectedInversePerspective);
407 REPORTER_ASSERT(reporter, nearly_equal(expected, inverse));
409 SkMatrix44 affineAndPerspective(SkMatrix44::kIdentity_Constructor);
410 affineAndPerspective.setDouble(3, 2, 1.0);
411 affineAndPerspective.preScale(10, 20, 100);
412 affineAndPerspective.preTranslate(2, 3, 4);
413 affineAndPerspective.invert(&inverse);
414 double expectedInverseAffineAndPerspective[16] =
419 expected.setRowMajord(expectedInverseAffineAndPerspective);
420 REPORTER_ASSERT(reporter, nearly_equal(expected, inverse));
423 static void test_transpose(skiatest::Reporter* reporter) {
424 SkMatrix44 a(SkMatrix44::kUninitialized_Constructor);
425 SkMatrix44 b(SkMatrix44::kUninitialized_Constructor);
428 for (int row = 0; row < 4; ++row) {
429 for (int col = 0; col < 4; ++col) {
430 a.setDouble(row, col, i);
431 b.setDouble(col, row, i++);
436 REPORTER_ASSERT(reporter, nearly_equal(a, b));
439 static void test_get_set_double(skiatest::Reporter* reporter) {
440 SkMatrix44 a(SkMatrix44::kUninitialized_Constructor);
441 for (int row = 0; row < 4; ++row) {
442 for (int col = 0; col < 4; ++col) {
443 a.setDouble(row, col, 3.141592653589793);
444 REPORTER_ASSERT(reporter,
445 nearly_equal_double(3.141592653589793,
446 a.getDouble(row, col)));
447 a.setDouble(row, col, 0);
448 REPORTER_ASSERT(reporter,
449 nearly_equal_double(0, a.getDouble(row, col)));
454 static void test_set_row_col_major(skiatest::Reporter* reporter) {
455 SkMatrix44 a(SkMatrix44::kUninitialized_Constructor);
456 SkMatrix44 b(SkMatrix44::kUninitialized_Constructor);
458 for (int row = 0; row < 4; ++row) {
459 for (int col = 0; col < 4; ++col) {
460 a.setDouble(row, col, row * 4 + col);
466 a.asColMajord(bufferd);
467 b.setColMajord(bufferd);
468 REPORTER_ASSERT(reporter, nearly_equal(a, b));
469 b.setRowMajord(bufferd);
471 REPORTER_ASSERT(reporter, nearly_equal(a, b));
472 a.asColMajorf(bufferf);
473 b.setColMajorf(bufferf);
474 REPORTER_ASSERT(reporter, nearly_equal(a, b));
475 b.setRowMajorf(bufferf);
477 REPORTER_ASSERT(reporter, nearly_equal(a, b));
480 static void test_3x3_conversion(skiatest::Reporter* reporter) {
481 SkMScalar values4x4[16] = { 1, 2, 3, 4,
485 SkScalar values3x3[9] = { 1, 2, 4,
488 SkMScalar values4x4flattened[16] = { 1, 2, 0, 4,
492 SkMatrix44 a44(SkMatrix44::kUninitialized_Constructor);
493 a44.setRowMajor(values4x4);
497 for (int i = 0; i < 9; i++) expected33[i] = values3x3[i];
498 REPORTER_ASSERT(reporter, expected33 == a33);
500 SkMatrix44 a44flattened = a33;
501 SkMatrix44 expected44flattened(SkMatrix44::kUninitialized_Constructor);
502 expected44flattened.setRowMajor(values4x4flattened);
503 REPORTER_ASSERT(reporter, nearly_equal(a44flattened, expected44flattened));
505 // Test that a point with a Z value of 0 is transformed the same way.
506 SkScalar vec4[4] = { 2, 4, 0, 8 };
507 SkScalar vec3[3] = { 2, 4, 8 };
509 SkScalar vec4transformed[4];
510 SkScalar vec3transformed[3];
511 SkScalar vec4transformed2[4];
512 a44.mapScalars(vec4, vec4transformed);
513 a33.mapHomogeneousPoints(vec3transformed, vec3, 1);
514 a44flattened.mapScalars(vec4, vec4transformed2);
515 REPORTER_ASSERT(reporter, nearly_equal_scalar(vec4transformed[0], vec3transformed[0]));
516 REPORTER_ASSERT(reporter, nearly_equal_scalar(vec4transformed[1], vec3transformed[1]));
517 REPORTER_ASSERT(reporter, nearly_equal_scalar(vec4transformed[3], vec3transformed[2]));
518 REPORTER_ASSERT(reporter, nearly_equal_scalar(vec4transformed[0], vec4transformed2[0]));
519 REPORTER_ASSERT(reporter, nearly_equal_scalar(vec4transformed[1], vec4transformed2[1]));
520 REPORTER_ASSERT(reporter, !nearly_equal_scalar(vec4transformed[2], vec4transformed2[2]));
521 REPORTER_ASSERT(reporter, nearly_equal_scalar(vec4transformed[3], vec4transformed2[3]));
524 static void test_has_perspective(skiatest::Reporter* reporter) {
525 SkMatrix44 transform(SkMatrix44::kIdentity_Constructor);
527 transform.set(3, 2, -0.1);
528 REPORTER_ASSERT(reporter, transform.hasPerspective());
531 REPORTER_ASSERT(reporter, !transform.hasPerspective());
533 transform.set(3, 0, -1.0);
534 REPORTER_ASSERT(reporter, transform.hasPerspective());
537 transform.set(3, 1, -1.0);
538 REPORTER_ASSERT(reporter, transform.hasPerspective());
541 transform.set(3, 2, -0.3);
542 REPORTER_ASSERT(reporter, transform.hasPerspective());
545 transform.set(3, 3, 0.5);
546 REPORTER_ASSERT(reporter, transform.hasPerspective());
549 transform.set(3, 3, 0.0);
550 REPORTER_ASSERT(reporter, transform.hasPerspective());
553 static bool is_rectilinear (SkVector4& p1, SkVector4& p2, SkVector4& p3, SkVector4& p4) {
554 return (SkScalarNearlyEqual(p1.fData[0], p2.fData[0]) &&
555 SkScalarNearlyEqual(p2.fData[1], p3.fData[1]) &&
556 SkScalarNearlyEqual(p3.fData[0], p4.fData[0]) &&
557 SkScalarNearlyEqual(p4.fData[1], p1.fData[1])) ||
558 (SkScalarNearlyEqual(p1.fData[1], p2.fData[1]) &&
559 SkScalarNearlyEqual(p2.fData[0], p3.fData[0]) &&
560 SkScalarNearlyEqual(p3.fData[1], p4.fData[1]) &&
561 SkScalarNearlyEqual(p4.fData[0], p1.fData[0]));
564 static SkVector4 mul_with_persp_divide(const SkMatrix44& transform, const SkVector4& target) {
565 SkVector4 result = transform * target;
566 if (result.fData[3] != 0.0f && result.fData[3] != SK_Scalar1) {
567 float wInverse = SK_Scalar1 / result.fData[3];
568 result.set(result.fData[0] * wInverse,
569 result.fData[1] * wInverse,
570 result.fData[2] * wInverse,
576 static bool empirically_preserves_2d_axis_alignment(skiatest::Reporter* reporter,
577 const SkMatrix44& transform) {
578 SkVector4 p1(5.0f, 5.0f, 0.0f);
579 SkVector4 p2(10.0f, 5.0f, 0.0f);
580 SkVector4 p3(10.0f, 20.0f, 0.0f);
581 SkVector4 p4(5.0f, 20.0f, 0.0f);
583 REPORTER_ASSERT(reporter, is_rectilinear(p1, p2, p3, p4));
585 p1 = mul_with_persp_divide(transform, p1);
586 p2 = mul_with_persp_divide(transform, p2);
587 p3 = mul_with_persp_divide(transform, p3);
588 p4 = mul_with_persp_divide(transform, p4);
590 return is_rectilinear(p1, p2, p3, p4);
593 static void test(bool expected, skiatest::Reporter* reporter, const SkMatrix44& transform) {
595 REPORTER_ASSERT(reporter, empirically_preserves_2d_axis_alignment(reporter, transform));
596 REPORTER_ASSERT(reporter, transform.preserves2dAxisAlignment());
598 REPORTER_ASSERT(reporter, !empirically_preserves_2d_axis_alignment(reporter, transform));
599 REPORTER_ASSERT(reporter, !transform.preserves2dAxisAlignment());
603 static void test_preserves_2d_axis_alignment(skiatest::Reporter* reporter) {
604 SkMatrix44 transform(SkMatrix44::kUninitialized_Constructor);
605 SkMatrix44 transform2(SkMatrix44::kUninitialized_Constructor);
607 static const struct TestCase {
608 SkMScalar a; // row 1, column 1
609 SkMScalar b; // row 1, column 2
610 SkMScalar c; // row 2, column 1
611 SkMScalar d; // row 2, column 2
615 0.f, 4.f, true }, // basic case
617 3.f, 0.f, true }, // rotate by 90
619 0.f, 4.f, true }, // degenerate x
621 0.f, 0.f, true }, // degenerate y
623 3.f, 0.f, true }, // degenerate x + rotate by 90
625 0.f, 0.f, true }, // degenerate y + rotate by 90
646 for (size_t i = 0; i < sizeof(test_cases)/sizeof(TestCase); ++i) {
647 const TestCase& value = test_cases[i];
648 transform.setIdentity();
649 transform.set(0, 0, value.a);
650 transform.set(0, 1, value.b);
651 transform.set(1, 0, value.c);
652 transform.set(1, 1, value.d);
654 test(value.expected, reporter, transform);
657 // Try the same test cases again, but this time make sure that other matrix
658 // elements (except perspective) have entries, to test that they are ignored.
659 for (size_t i = 0; i < sizeof(test_cases)/sizeof(TestCase); ++i) {
660 const TestCase& value = test_cases[i];
661 transform.setIdentity();
662 transform.set(0, 0, value.a);
663 transform.set(0, 1, value.b);
664 transform.set(1, 0, value.c);
665 transform.set(1, 1, value.d);
667 transform.set(0, 2, 1.f);
668 transform.set(0, 3, 2.f);
669 transform.set(1, 2, 3.f);
670 transform.set(1, 3, 4.f);
671 transform.set(2, 0, 5.f);
672 transform.set(2, 1, 6.f);
673 transform.set(2, 2, 7.f);
674 transform.set(2, 3, 8.f);
676 test(value.expected, reporter, transform);
679 // Try the same test cases again, but this time add perspective which is
680 // always assumed to not-preserve axis alignment.
681 for (size_t i = 0; i < sizeof(test_cases)/sizeof(TestCase); ++i) {
682 const TestCase& value = test_cases[i];
683 transform.setIdentity();
684 transform.set(0, 0, value.a);
685 transform.set(0, 1, value.b);
686 transform.set(1, 0, value.c);
687 transform.set(1, 1, value.d);
689 transform.set(0, 2, 1.f);
690 transform.set(0, 3, 2.f);
691 transform.set(1, 2, 3.f);
692 transform.set(1, 3, 4.f);
693 transform.set(2, 0, 5.f);
694 transform.set(2, 1, 6.f);
695 transform.set(2, 2, 7.f);
696 transform.set(2, 3, 8.f);
697 transform.set(3, 0, 9.f);
698 transform.set(3, 1, 10.f);
699 transform.set(3, 2, 11.f);
700 transform.set(3, 3, 12.f);
702 test(false, reporter, transform);
705 // Try a few more practical situations to check precision
706 // Reuse TestCase (a, b, c, d) as (x, y, z, degrees) axis to rotate about.
707 TestCase rotation_tests[] = {
708 { 0.0, 0.0, 1.0, 90.0, true },
709 { 0.0, 0.0, 1.0, 180.0, true },
710 { 0.0, 0.0, 1.0, 270.0, true },
711 { 0.0, 1.0, 0.0, 90.0, true },
712 { 1.0, 0.0, 0.0, 90.0, true },
713 { 0.0, 0.0, 1.0, 45.0, false },
714 // In 3d these next two are non-preserving, but we're testing in 2d after
715 // orthographic projection, where they are.
716 { 0.0, 1.0, 0.0, 45.0, true },
717 { 1.0, 0.0, 0.0, 45.0, true },
720 for (size_t i = 0; i < sizeof(rotation_tests)/sizeof(TestCase); ++i) {
721 const TestCase& value = rotation_tests[i];
722 transform.setRotateDegreesAbout(value.a, value.b, value.c, value.d);
723 test(value.expected, reporter, transform);
726 static const struct DoubleRotationCase {
736 } double_rotation_tests[] = {
737 { 0.0, 0.0, 1.0, 90.0, 0.0, 1.0, 0.0, 90.0, true },
738 { 0.0, 0.0, 1.0, 90.0, 1.0, 0.0, 0.0, 90.0, true },
739 { 0.0, 1.0, 0.0, 90.0, 0.0, 0.0, 1.0, 90.0, true },
742 for (size_t i = 0; i < sizeof(double_rotation_tests)/sizeof(DoubleRotationCase); ++i) {
743 const DoubleRotationCase& value = double_rotation_tests[i];
744 transform.setRotateDegreesAbout(value.x1, value.y1, value.z1, value.degrees1);
745 transform2.setRotateDegreesAbout(value.x2, value.y2, value.z2, value.degrees2);
746 transform.postConcat(transform2);
747 test(value.expected, reporter, transform);
750 // Perspective cases.
751 transform.setIdentity();
752 transform.set(3, 2, -0.1); // Perspective depth 10
753 transform2.setRotateDegreesAbout(0.0, 1.0, 0.0, 45.0);
754 transform.preConcat(transform2);
755 test(false, reporter, transform);
757 transform.setIdentity();
758 transform.set(3, 2, -0.1); // Perspective depth 10
759 transform2.setRotateDegreesAbout(0.0, 0.0, 1.0, 90.0);
760 transform.preConcat(transform2);
761 test(true, reporter, transform);
764 // just want to exercise the various converters for MScalar
765 static void test_toint(skiatest::Reporter* reporter) {
766 SkMatrix44 mat(SkMatrix44::kUninitialized_Constructor);
767 mat.setScale(3, 3, 3);
769 SkMScalar sum = SkMScalarFloor(mat.get(0, 0)) +
770 SkMScalarRound(mat.get(1, 0)) +
771 SkMScalarCeil(mat.get(2, 0));
772 int isum = SkMScalarFloorToInt(mat.get(0, 1)) +
773 SkMScalarRoundToInt(mat.get(1, 2)) +
774 SkMScalarCeilToInt(mat.get(2, 3));
775 REPORTER_ASSERT(reporter, sum >= 0);
776 REPORTER_ASSERT(reporter, isum >= 0);
777 REPORTER_ASSERT(reporter, static_cast<SkMScalar>(isum) == SkIntToMScalar(isum));
780 DEF_TEST(Matrix44, reporter) {
781 SkMatrix44 mat(SkMatrix44::kUninitialized_Constructor);
782 SkMatrix44 inverse(SkMatrix44::kUninitialized_Constructor);
783 SkMatrix44 iden1(SkMatrix44::kUninitialized_Constructor);
784 SkMatrix44 iden2(SkMatrix44::kUninitialized_Constructor);
785 SkMatrix44 rot(SkMatrix44::kUninitialized_Constructor);
787 mat.setTranslate(1, 1, 1);
788 mat.invert(&inverse);
789 iden1.setConcat(mat, inverse);
790 REPORTER_ASSERT(reporter, is_identity(iden1));
792 mat.setScale(2, 2, 2);
793 mat.invert(&inverse);
794 iden1.setConcat(mat, inverse);
795 REPORTER_ASSERT(reporter, is_identity(iden1));
797 mat.setScale(SK_MScalar1/2, SK_MScalar1/2, SK_MScalar1/2);
798 mat.invert(&inverse);
799 iden1.setConcat(mat, inverse);
800 REPORTER_ASSERT(reporter, is_identity(iden1));
802 mat.setScale(3, 3, 3);
803 rot.setRotateDegreesAbout(0, 0, -1, 90);
805 REPORTER_ASSERT(reporter, mat.invert(NULL));
806 mat.invert(&inverse);
807 iden1.setConcat(mat, inverse);
808 REPORTER_ASSERT(reporter, is_identity(iden1));
809 iden2.setConcat(inverse, mat);
810 REPORTER_ASSERT(reporter, is_identity(iden2));
812 // test tiny-valued matrix inverse
814 mat.setScale(1.0e-12, 1.0e-12, 1.0e-12);
815 rot.setRotateDegreesAbout(0, 0, -1, 90);
817 mat.postTranslate(1.0e-12, 1.0e-12, 1.0e-12);
818 REPORTER_ASSERT(reporter, mat.invert(NULL));
819 mat.invert(&inverse);
820 iden1.setConcat(mat, inverse);
821 REPORTER_ASSERT(reporter, is_identity(iden1));
823 // test mixed-valued matrix inverse
825 mat.setScale(1.0e-10, 3.0, 1.0e+10);
826 rot.setRotateDegreesAbout(0, 0, -1, 90);
828 mat.postTranslate(1.0e+10, 3.0, 1.0e-10);
829 REPORTER_ASSERT(reporter, mat.invert(NULL));
830 mat.invert(&inverse);
831 iden1.setConcat(mat, inverse);
832 REPORTER_ASSERT(reporter, is_identity(iden1));
834 // test degenerate matrix
836 mat.set3x3(1.0, 1.0, 0.0, 1.0, 0.0, 0.0, 0.0, 1.0, 0.0);
837 REPORTER_ASSERT(reporter, !mat.invert(NULL));
839 // test rol/col Major getters
841 mat.setTranslate(2, 3, 4);
845 mat.asColMajorf(dataf);
846 assert16<float>(reporter, dataf,
851 mat.asColMajord(datad);
852 assert16<double>(reporter, datad, 1, 0, 0, 0,
856 mat.asRowMajorf(dataf);
857 assert16<float>(reporter, dataf, 1, 0, 0, 2,
861 mat.asRowMajord(datad);
862 assert16<double>(reporter, datad, 1, 0, 0, 2,
868 test_concat(reporter);
870 if (false) { // avoid bit rot, suppress warning (working on making this pass)
871 test_common_angles(reporter);
874 test_constructor(reporter);
875 test_gettype(reporter);
876 test_determinant(reporter);
877 test_invert(reporter);
878 test_transpose(reporter);
879 test_get_set_double(reporter);
880 test_set_row_col_major(reporter);
881 test_translate(reporter);
882 test_scale(reporter);
884 test_3x3_conversion(reporter);
885 test_has_perspective(reporter);
886 test_preserves_2d_axis_alignment(reporter);
887 test_toint(reporter);