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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Test cases for the drm_rect functions
4 *
5 * Copyright (c) 2022 Maíra Canal <mairacanal@riseup.net>
6 */
7
8#include <kunit/test.h>
9
10#include <drm/drm_rect.h>
11
12static void drm_test_rect_clip_scaled_div_by_zero(struct kunit *test)
13{
14 struct drm_rect src, dst, clip;
15 bool visible;
16
17 /*
18 * Make sure we don't divide by zero when dst
19 * width/height is zero and dst and clip do not intersect.
20 */
21 drm_rect_init(&src, 0, 0, 0, 0);
22 drm_rect_init(&dst, 0, 0, 0, 0);
23 drm_rect_init(&clip, 1, 1, 1, 1);
24 visible = drm_rect_clip_scaled(&src, &dst, &clip);
25
26 KUNIT_EXPECT_FALSE_MSG(test, visible, "Destination not be visible\n");
27 KUNIT_EXPECT_FALSE_MSG(test, drm_rect_visible(&src), "Source should not be visible\n");
28
29 drm_rect_init(&src, 0, 0, 0, 0);
30 drm_rect_init(&dst, 3, 3, 0, 0);
31 drm_rect_init(&clip, 1, 1, 1, 1);
32 visible = drm_rect_clip_scaled(&src, &dst, &clip);
33
34 KUNIT_EXPECT_FALSE_MSG(test, visible, "Destination not be visible\n");
35 KUNIT_EXPECT_FALSE_MSG(test, drm_rect_visible(&src), "Source should not be visible\n");
36}
37
38static void drm_test_rect_clip_scaled_not_clipped(struct kunit *test)
39{
40 struct drm_rect src, dst, clip;
41 bool visible;
42
43 /* 1:1 scaling */
44 drm_rect_init(&src, 0, 0, 1 << 16, 1 << 16);
45 drm_rect_init(&dst, 0, 0, 1, 1);
46 drm_rect_init(&clip, 0, 0, 1, 1);
47
48 visible = drm_rect_clip_scaled(&src, &dst, &clip);
49
50 KUNIT_EXPECT_FALSE_MSG(test, src.x1 != 0 || src.x2 != 1 << 16 ||
51 src.y1 != 0 || src.y2 != 1 << 16, "Source badly clipped\n");
52 KUNIT_EXPECT_FALSE_MSG(test, dst.x1 != 0 || dst.x2 != 1 ||
53 dst.y1 != 0 || dst.y2 != 1, "Destination badly clipped\n");
54 KUNIT_EXPECT_TRUE_MSG(test, visible, "Destination should be visible\n");
55 KUNIT_EXPECT_TRUE_MSG(test, drm_rect_visible(&src), "Source should be visible\n");
56
57 /* 2:1 scaling */
58 drm_rect_init(&src, 0, 0, 2 << 16, 2 << 16);
59 drm_rect_init(&dst, 0, 0, 1, 1);
60 drm_rect_init(&clip, 0, 0, 1, 1);
61
62 visible = drm_rect_clip_scaled(&src, &dst, &clip);
63
64 KUNIT_EXPECT_FALSE_MSG(test, src.x1 != 0 || src.x2 != 2 << 16 ||
65 src.y1 != 0 || src.y2 != 2 << 16, "Source badly clipped\n");
66 KUNIT_EXPECT_FALSE_MSG(test, dst.x1 != 0 || dst.x2 != 1 ||
67 dst.y1 != 0 || dst.y2 != 1, "Destination badly clipped\n");
68 KUNIT_EXPECT_TRUE_MSG(test, visible, "Destination should be visible\n");
69 KUNIT_EXPECT_TRUE_MSG(test, drm_rect_visible(&src), "Source should be visible\n");
70
71 /* 1:2 scaling */
72 drm_rect_init(&src, 0, 0, 1 << 16, 1 << 16);
73 drm_rect_init(&dst, 0, 0, 2, 2);
74 drm_rect_init(&clip, 0, 0, 2, 2);
75
76 visible = drm_rect_clip_scaled(&src, &dst, &clip);
77
78 KUNIT_EXPECT_FALSE_MSG(test, src.x1 != 0 || src.x2 != 1 << 16 ||
79 src.y1 != 0 || src.y2 != 1 << 16, "Source badly clipped\n");
80 KUNIT_EXPECT_FALSE_MSG(test, dst.x1 != 0 || dst.x2 != 2 ||
81 dst.y1 != 0 || dst.y2 != 2, "Destination badly clipped\n");
82 KUNIT_EXPECT_TRUE_MSG(test, visible, "Destination should be visible\n");
83 KUNIT_EXPECT_TRUE_MSG(test, drm_rect_visible(&src), "Source should be visible\n");
84}
85
86static void drm_test_rect_clip_scaled_clipped(struct kunit *test)
87{
88 struct drm_rect src, dst, clip;
89 bool visible;
90
91 /* 1:1 scaling top/left clip */
92 drm_rect_init(&src, 0, 0, 2 << 16, 2 << 16);
93 drm_rect_init(&dst, 0, 0, 2, 2);
94 drm_rect_init(&clip, 0, 0, 1, 1);
95
96 visible = drm_rect_clip_scaled(&src, &dst, &clip);
97
98 KUNIT_EXPECT_FALSE_MSG(test, src.x1 != 0 || src.x2 != 1 << 16 ||
99 src.y1 != 0 || src.y2 != 1 << 16, "Source badly clipped\n");
100 KUNIT_EXPECT_FALSE_MSG(test, dst.x1 != 0 || dst.x2 != 1 ||
101 dst.y1 != 0 || dst.y2 != 1, "Destination badly clipped\n");
102 KUNIT_EXPECT_TRUE_MSG(test, visible, "Destination should be visible\n");
103 KUNIT_EXPECT_TRUE_MSG(test, drm_rect_visible(&src), "Source should be visible\n");
104
105 /* 1:1 scaling bottom/right clip */
106 drm_rect_init(&src, 0, 0, 2 << 16, 2 << 16);
107 drm_rect_init(&dst, 0, 0, 2, 2);
108 drm_rect_init(&clip, 1, 1, 1, 1);
109
110 visible = drm_rect_clip_scaled(&src, &dst, &clip);
111
112 KUNIT_EXPECT_FALSE_MSG(test, src.x1 != 1 << 16 || src.x2 != 2 << 16 ||
113 src.y1 != 1 << 16 || src.y2 != 2 << 16, "Source badly clipped\n");
114 KUNIT_EXPECT_FALSE_MSG(test, dst.x1 != 1 || dst.x2 != 2 || dst.y1 != 1 ||
115 dst.y2 != 2, "Destination badly clipped\n");
116 KUNIT_EXPECT_TRUE_MSG(test, visible, "Destination should be visible\n");
117 KUNIT_EXPECT_TRUE_MSG(test, drm_rect_visible(&src), "Source should be visible\n");
118
119 /* 2:1 scaling top/left clip */
120 drm_rect_init(&src, 0, 0, 4 << 16, 4 << 16);
121 drm_rect_init(&dst, 0, 0, 2, 2);
122 drm_rect_init(&clip, 0, 0, 1, 1);
123
124 visible = drm_rect_clip_scaled(&src, &dst, &clip);
125
126 KUNIT_EXPECT_FALSE_MSG(test, src.x1 != 0 || src.x2 != 2 << 16 ||
127 src.y1 != 0 || src.y2 != 2 << 16, "Source badly clipped\n");
128 KUNIT_EXPECT_FALSE_MSG(test, dst.x1 != 0 || dst.x2 != 1 || dst.y1 != 0 ||
129 dst.y2 != 1, "Destination badly clipped\n");
130 KUNIT_EXPECT_TRUE_MSG(test, visible, "Destination should be visible\n");
131 KUNIT_EXPECT_TRUE_MSG(test, drm_rect_visible(&src), "Source should be visible\n");
132
133 /* 2:1 scaling bottom/right clip */
134 drm_rect_init(&src, 0, 0, 4 << 16, 4 << 16);
135 drm_rect_init(&dst, 0, 0, 2, 2);
136 drm_rect_init(&clip, 1, 1, 1, 1);
137
138 visible = drm_rect_clip_scaled(&src, &dst, &clip);
139
140 KUNIT_EXPECT_FALSE_MSG(test, src.x1 != 2 << 16 || src.x2 != 4 << 16 ||
141 src.y1 != 2 << 16 || src.y2 != 4 << 16, "Source badly clipped\n");
142 KUNIT_EXPECT_FALSE_MSG(test, dst.x1 != 1 || dst.x2 != 2 || dst.y1 != 1 ||
143 dst.y2 != 2, "Destination badly clipped\n");
144 KUNIT_EXPECT_TRUE_MSG(test, visible, "Destination should be visible\n");
145 KUNIT_EXPECT_TRUE_MSG(test, drm_rect_visible(&src), "Source should be visible\n");
146
147 /* 1:2 scaling top/left clip */
148 drm_rect_init(&src, 0, 0, 2 << 16, 2 << 16);
149 drm_rect_init(&dst, 0, 0, 4, 4);
150 drm_rect_init(&clip, 0, 0, 2, 2);
151
152 visible = drm_rect_clip_scaled(&src, &dst, &clip);
153
154 KUNIT_EXPECT_FALSE_MSG(test, src.x1 != 0 || src.x2 != 1 << 16 ||
155 src.y1 != 0 || src.y2 != 1 << 16, "Source badly clipped\n");
156 KUNIT_EXPECT_FALSE_MSG(test, dst.x1 != 0 || dst.x2 != 2 || dst.y1 != 0 ||
157 dst.y2 != 2, "Destination badly clipped\n");
158 KUNIT_EXPECT_TRUE_MSG(test, visible, "Destination should be visible\n");
159 KUNIT_EXPECT_TRUE_MSG(test, drm_rect_visible(&src), "Source should be visible\n");
160
161 /* 1:2 scaling bottom/right clip */
162 drm_rect_init(&src, 0, 0, 2 << 16, 2 << 16);
163 drm_rect_init(&dst, 0, 0, 4, 4);
164 drm_rect_init(&clip, 2, 2, 2, 2);
165
166 visible = drm_rect_clip_scaled(&src, &dst, &clip);
167
168 KUNIT_EXPECT_FALSE_MSG(test, src.x1 != 1 << 16 || src.x2 != 2 << 16 ||
169 src.y1 != 1 << 16 || src.y2 != 2 << 16, "Source badly clipped\n");
170 KUNIT_EXPECT_FALSE_MSG(test, dst.x1 != 2 || dst.x2 != 4 || dst.y1 != 2 ||
171 dst.y2 != 4, "Destination badly clipped\n");
172 KUNIT_EXPECT_TRUE_MSG(test, visible, "Destination should be visible\n");
173 KUNIT_EXPECT_TRUE_MSG(test, drm_rect_visible(&src), "Source should be visible\n");
174}
175
176static void drm_test_rect_clip_scaled_signed_vs_unsigned(struct kunit *test)
177{
178 struct drm_rect src, dst, clip;
179 bool visible;
180
181 /*
182 * 'clip.x2 - dst.x1 >= dst width' could result a negative
183 * src rectangle width which is no longer expected by the
184 * code as it's using unsigned types. This could lead to
185 * the clipped source rectangle appering visible when it
186 * should have been fully clipped. Make sure both rectangles
187 * end up invisible.
188 */
189 drm_rect_init(&src, 0, 0, INT_MAX, INT_MAX);
190 drm_rect_init(&dst, 0, 0, 2, 2);
191 drm_rect_init(&clip, 3, 3, 1, 1);
192
193 visible = drm_rect_clip_scaled(&src, &dst, &clip);
194
195 KUNIT_EXPECT_FALSE_MSG(test, visible, "Destination should not be visible\n");
196 KUNIT_EXPECT_FALSE_MSG(test, drm_rect_visible(&src), "Source should not be visible\n");
197}
198
199static struct kunit_case drm_rect_tests[] = {
200 KUNIT_CASE(drm_test_rect_clip_scaled_div_by_zero),
201 KUNIT_CASE(drm_test_rect_clip_scaled_not_clipped),
202 KUNIT_CASE(drm_test_rect_clip_scaled_clipped),
203 KUNIT_CASE(drm_test_rect_clip_scaled_signed_vs_unsigned),
204 { }
205};
206
207static struct kunit_suite drm_rect_test_suite = {
208 .name = "drm_rect",
209 .test_cases = drm_rect_tests,
210};
211
212kunit_test_suite(drm_rect_test_suite);
213
214MODULE_LICENSE("GPL");