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// SPDX-License-Identifier: GPL-2.0
/*
* Test cases for the drm_rect functions
*
* Copyright (c) 2022 Maíra Canal <mairacanal@riseup.net>
*/
#include <kunit/test.h>
#include <drm/drm_rect.h>
#include <linux/string_helpers.h>
#include <linux/errno.h>
static void drm_rect_compare(struct kunit *test, const struct drm_rect *r,
const struct drm_rect *expected)
{
KUNIT_EXPECT_EQ(test, r->x1, expected->x1);
KUNIT_EXPECT_EQ(test, r->y1, expected->y1);
KUNIT_EXPECT_EQ(test, drm_rect_width(r), drm_rect_width(expected));
KUNIT_EXPECT_EQ(test, drm_rect_height(r), drm_rect_height(expected));
}
static void drm_test_rect_clip_scaled_div_by_zero(struct kunit *test)
{
struct drm_rect src, dst, clip;
bool visible;
/*
* Make sure we don't divide by zero when dst
* width/height is zero and dst and clip do not intersect.
*/
drm_rect_init(&src, 0, 0, 0, 0);
drm_rect_init(&dst, 0, 0, 0, 0);
drm_rect_init(&clip, 1, 1, 1, 1);
visible = drm_rect_clip_scaled(&src, &dst, &clip);
KUNIT_EXPECT_FALSE_MSG(test, visible, "Destination not be visible\n");
KUNIT_EXPECT_FALSE_MSG(test, drm_rect_visible(&src), "Source should not be visible\n");
drm_rect_init(&src, 0, 0, 0, 0);
drm_rect_init(&dst, 3, 3, 0, 0);
drm_rect_init(&clip, 1, 1, 1, 1);
visible = drm_rect_clip_scaled(&src, &dst, &clip);
KUNIT_EXPECT_FALSE_MSG(test, visible, "Destination not be visible\n");
KUNIT_EXPECT_FALSE_MSG(test, drm_rect_visible(&src), "Source should not be visible\n");
}
static void drm_test_rect_clip_scaled_not_clipped(struct kunit *test)
{
struct drm_rect src, dst, clip;
bool visible;
/* 1:1 scaling */
drm_rect_init(&src, 0, 0, 1 << 16, 1 << 16);
drm_rect_init(&dst, 0, 0, 1, 1);
drm_rect_init(&clip, 0, 0, 1, 1);
visible = drm_rect_clip_scaled(&src, &dst, &clip);
KUNIT_EXPECT_FALSE_MSG(test, src.x1 != 0 || src.x2 != 1 << 16 ||
src.y1 != 0 || src.y2 != 1 << 16, "Source badly clipped\n");
KUNIT_EXPECT_FALSE_MSG(test, dst.x1 != 0 || dst.x2 != 1 ||
dst.y1 != 0 || dst.y2 != 1, "Destination badly clipped\n");
KUNIT_EXPECT_TRUE_MSG(test, visible, "Destination should be visible\n");
KUNIT_EXPECT_TRUE_MSG(test, drm_rect_visible(&src), "Source should be visible\n");
/* 2:1 scaling */
drm_rect_init(&src, 0, 0, 2 << 16, 2 << 16);
drm_rect_init(&dst, 0, 0, 1, 1);
drm_rect_init(&clip, 0, 0, 1, 1);
visible = drm_rect_clip_scaled(&src, &dst, &clip);
KUNIT_EXPECT_FALSE_MSG(test, src.x1 != 0 || src.x2 != 2 << 16 ||
src.y1 != 0 || src.y2 != 2 << 16, "Source badly clipped\n");
KUNIT_EXPECT_FALSE_MSG(test, dst.x1 != 0 || dst.x2 != 1 ||
dst.y1 != 0 || dst.y2 != 1, "Destination badly clipped\n");
KUNIT_EXPECT_TRUE_MSG(test, visible, "Destination should be visible\n");
KUNIT_EXPECT_TRUE_MSG(test, drm_rect_visible(&src), "Source should be visible\n");
/* 1:2 scaling */
drm_rect_init(&src, 0, 0, 1 << 16, 1 << 16);
drm_rect_init(&dst, 0, 0, 2, 2);
drm_rect_init(&clip, 0, 0, 2, 2);
visible = drm_rect_clip_scaled(&src, &dst, &clip);
KUNIT_EXPECT_FALSE_MSG(test, src.x1 != 0 || src.x2 != 1 << 16 ||
src.y1 != 0 || src.y2 != 1 << 16, "Source badly clipped\n");
KUNIT_EXPECT_FALSE_MSG(test, dst.x1 != 0 || dst.x2 != 2 ||
dst.y1 != 0 || dst.y2 != 2, "Destination badly clipped\n");
KUNIT_EXPECT_TRUE_MSG(test, visible, "Destination should be visible\n");
KUNIT_EXPECT_TRUE_MSG(test, drm_rect_visible(&src), "Source should be visible\n");
}
static void drm_test_rect_clip_scaled_clipped(struct kunit *test)
{
struct drm_rect src, dst, clip;
bool visible;
/* 1:1 scaling top/left clip */
drm_rect_init(&src, 0, 0, 2 << 16, 2 << 16);
drm_rect_init(&dst, 0, 0, 2, 2);
drm_rect_init(&clip, 0, 0, 1, 1);
visible = drm_rect_clip_scaled(&src, &dst, &clip);
KUNIT_EXPECT_FALSE_MSG(test, src.x1 != 0 || src.x2 != 1 << 16 ||
src.y1 != 0 || src.y2 != 1 << 16, "Source badly clipped\n");
KUNIT_EXPECT_FALSE_MSG(test, dst.x1 != 0 || dst.x2 != 1 ||
dst.y1 != 0 || dst.y2 != 1, "Destination badly clipped\n");
KUNIT_EXPECT_TRUE_MSG(test, visible, "Destination should be visible\n");
KUNIT_EXPECT_TRUE_MSG(test, drm_rect_visible(&src), "Source should be visible\n");
/* 1:1 scaling bottom/right clip */
drm_rect_init(&src, 0, 0, 2 << 16, 2 << 16);
drm_rect_init(&dst, 0, 0, 2, 2);
drm_rect_init(&clip, 1, 1, 1, 1);
visible = drm_rect_clip_scaled(&src, &dst, &clip);
KUNIT_EXPECT_FALSE_MSG(test, src.x1 != 1 << 16 || src.x2 != 2 << 16 ||
src.y1 != 1 << 16 || src.y2 != 2 << 16, "Source badly clipped\n");
KUNIT_EXPECT_FALSE_MSG(test, dst.x1 != 1 || dst.x2 != 2 || dst.y1 != 1 ||
dst.y2 != 2, "Destination badly clipped\n");
KUNIT_EXPECT_TRUE_MSG(test, visible, "Destination should be visible\n");
KUNIT_EXPECT_TRUE_MSG(test, drm_rect_visible(&src), "Source should be visible\n");
/* 2:1 scaling top/left clip */
drm_rect_init(&src, 0, 0, 4 << 16, 4 << 16);
drm_rect_init(&dst, 0, 0, 2, 2);
drm_rect_init(&clip, 0, 0, 1, 1);
visible = drm_rect_clip_scaled(&src, &dst, &clip);
KUNIT_EXPECT_FALSE_MSG(test, src.x1 != 0 || src.x2 != 2 << 16 ||
src.y1 != 0 || src.y2 != 2 << 16, "Source badly clipped\n");
KUNIT_EXPECT_FALSE_MSG(test, dst.x1 != 0 || dst.x2 != 1 || dst.y1 != 0 ||
dst.y2 != 1, "Destination badly clipped\n");
KUNIT_EXPECT_TRUE_MSG(test, visible, "Destination should be visible\n");
KUNIT_EXPECT_TRUE_MSG(test, drm_rect_visible(&src), "Source should be visible\n");
/* 2:1 scaling bottom/right clip */
drm_rect_init(&src, 0, 0, 4 << 16, 4 << 16);
drm_rect_init(&dst, 0, 0, 2, 2);
drm_rect_init(&clip, 1, 1, 1, 1);
visible = drm_rect_clip_scaled(&src, &dst, &clip);
KUNIT_EXPECT_FALSE_MSG(test, src.x1 != 2 << 16 || src.x2 != 4 << 16 ||
src.y1 != 2 << 16 || src.y2 != 4 << 16, "Source badly clipped\n");
KUNIT_EXPECT_FALSE_MSG(test, dst.x1 != 1 || dst.x2 != 2 || dst.y1 != 1 ||
dst.y2 != 2, "Destination badly clipped\n");
KUNIT_EXPECT_TRUE_MSG(test, visible, "Destination should be visible\n");
KUNIT_EXPECT_TRUE_MSG(test, drm_rect_visible(&src), "Source should be visible\n");
/* 1:2 scaling top/left clip */
drm_rect_init(&src, 0, 0, 2 << 16, 2 << 16);
drm_rect_init(&dst, 0, 0, 4, 4);
drm_rect_init(&clip, 0, 0, 2, 2);
visible = drm_rect_clip_scaled(&src, &dst, &clip);
KUNIT_EXPECT_FALSE_MSG(test, src.x1 != 0 || src.x2 != 1 << 16 ||
src.y1 != 0 || src.y2 != 1 << 16, "Source badly clipped\n");
KUNIT_EXPECT_FALSE_MSG(test, dst.x1 != 0 || dst.x2 != 2 || dst.y1 != 0 ||
dst.y2 != 2, "Destination badly clipped\n");
KUNIT_EXPECT_TRUE_MSG(test, visible, "Destination should be visible\n");
KUNIT_EXPECT_TRUE_MSG(test, drm_rect_visible(&src), "Source should be visible\n");
/* 1:2 scaling bottom/right clip */
drm_rect_init(&src, 0, 0, 2 << 16, 2 << 16);
drm_rect_init(&dst, 0, 0, 4, 4);
drm_rect_init(&clip, 2, 2, 2, 2);
visible = drm_rect_clip_scaled(&src, &dst, &clip);
KUNIT_EXPECT_FALSE_MSG(test, src.x1 != 1 << 16 || src.x2 != 2 << 16 ||
src.y1 != 1 << 16 || src.y2 != 2 << 16, "Source badly clipped\n");
KUNIT_EXPECT_FALSE_MSG(test, dst.x1 != 2 || dst.x2 != 4 || dst.y1 != 2 ||
dst.y2 != 4, "Destination badly clipped\n");
KUNIT_EXPECT_TRUE_MSG(test, visible, "Destination should be visible\n");
KUNIT_EXPECT_TRUE_MSG(test, drm_rect_visible(&src), "Source should be visible\n");
}
static void drm_test_rect_clip_scaled_signed_vs_unsigned(struct kunit *test)
{
struct drm_rect src, dst, clip;
bool visible;
/*
* 'clip.x2 - dst.x1 >= dst width' could result a negative
* src rectangle width which is no longer expected by the
* code as it's using unsigned types. This could lead to
* the clipped source rectangle appering visible when it
* should have been fully clipped. Make sure both rectangles
* end up invisible.
*/
drm_rect_init(&src, 0, 0, INT_MAX, INT_MAX);
drm_rect_init(&dst, 0, 0, 2, 2);
drm_rect_init(&clip, 3, 3, 1, 1);
visible = drm_rect_clip_scaled(&src, &dst, &clip);
KUNIT_EXPECT_FALSE_MSG(test, visible, "Destination should not be visible\n");
KUNIT_EXPECT_FALSE_MSG(test, drm_rect_visible(&src), "Source should not be visible\n");
}
struct drm_rect_intersect_case {
const char *description;
struct drm_rect r1, r2;
bool should_be_visible;
struct drm_rect expected_intersection;
};
static const struct drm_rect_intersect_case drm_rect_intersect_cases[] = {
{
.description = "top-left x bottom-right",
.r1 = DRM_RECT_INIT(1, 1, 2, 2),
.r2 = DRM_RECT_INIT(0, 0, 2, 2),
.should_be_visible = true,
.expected_intersection = DRM_RECT_INIT(1, 1, 1, 1),
},
{
.description = "top-right x bottom-left",
.r1 = DRM_RECT_INIT(0, 0, 2, 2),
.r2 = DRM_RECT_INIT(1, -1, 2, 2),
.should_be_visible = true,
.expected_intersection = DRM_RECT_INIT(1, 0, 1, 1),
},
{
.description = "bottom-left x top-right",
.r1 = DRM_RECT_INIT(1, -1, 2, 2),
.r2 = DRM_RECT_INIT(0, 0, 2, 2),
.should_be_visible = true,
.expected_intersection = DRM_RECT_INIT(1, 0, 1, 1),
},
{
.description = "bottom-right x top-left",
.r1 = DRM_RECT_INIT(0, 0, 2, 2),
.r2 = DRM_RECT_INIT(1, 1, 2, 2),
.should_be_visible = true,
.expected_intersection = DRM_RECT_INIT(1, 1, 1, 1),
},
{
.description = "right x left",
.r1 = DRM_RECT_INIT(0, 0, 2, 1),
.r2 = DRM_RECT_INIT(1, 0, 3, 1),
.should_be_visible = true,
.expected_intersection = DRM_RECT_INIT(1, 0, 1, 1),
},
{
.description = "left x right",
.r1 = DRM_RECT_INIT(1, 0, 3, 1),
.r2 = DRM_RECT_INIT(0, 0, 2, 1),
.should_be_visible = true,
.expected_intersection = DRM_RECT_INIT(1, 0, 1, 1),
},
{
.description = "up x bottom",
.r1 = DRM_RECT_INIT(0, 0, 1, 2),
.r2 = DRM_RECT_INIT(0, -1, 1, 3),
.should_be_visible = true,
.expected_intersection = DRM_RECT_INIT(0, 0, 1, 2),
},
{
.description = "bottom x up",
.r1 = DRM_RECT_INIT(0, -1, 1, 3),
.r2 = DRM_RECT_INIT(0, 0, 1, 2),
.should_be_visible = true,
.expected_intersection = DRM_RECT_INIT(0, 0, 1, 2),
},
{
.description = "touching corner",
.r1 = DRM_RECT_INIT(0, 0, 1, 1),
.r2 = DRM_RECT_INIT(1, 1, 2, 2),
.should_be_visible = false,
.expected_intersection = DRM_RECT_INIT(1, 1, 0, 0),
},
{
.description = "touching side",
.r1 = DRM_RECT_INIT(0, 0, 1, 1),
.r2 = DRM_RECT_INIT(1, 0, 1, 1),
.should_be_visible = false,
.expected_intersection = DRM_RECT_INIT(1, 0, 0, 1),
},
{
.description = "equal rects",
.r1 = DRM_RECT_INIT(0, 0, 2, 2),
.r2 = DRM_RECT_INIT(0, 0, 2, 2),
.should_be_visible = true,
.expected_intersection = DRM_RECT_INIT(0, 0, 2, 2),
},
{
.description = "inside another",
.r1 = DRM_RECT_INIT(0, 0, 2, 2),
.r2 = DRM_RECT_INIT(1, 1, 1, 1),
.should_be_visible = true,
.expected_intersection = DRM_RECT_INIT(1, 1, 1, 1),
},
{
.description = "far away",
.r1 = DRM_RECT_INIT(0, 0, 1, 1),
.r2 = DRM_RECT_INIT(3, 6, 1, 1),
.should_be_visible = false,
.expected_intersection = DRM_RECT_INIT(3, 6, -2, -5),
},
{
.description = "points intersecting",
.r1 = DRM_RECT_INIT(5, 10, 0, 0),
.r2 = DRM_RECT_INIT(5, 10, 0, 0),
.should_be_visible = false,
.expected_intersection = DRM_RECT_INIT(5, 10, 0, 0),
},
{
.description = "points not intersecting",
.r1 = DRM_RECT_INIT(0, 0, 0, 0),
.r2 = DRM_RECT_INIT(5, 10, 0, 0),
.should_be_visible = false,
.expected_intersection = DRM_RECT_INIT(5, 10, -5, -10),
},
};
static void drm_rect_intersect_case_desc(const struct drm_rect_intersect_case *t, char *desc)
{
snprintf(desc, KUNIT_PARAM_DESC_SIZE,
"%s: " DRM_RECT_FMT " x " DRM_RECT_FMT,
t->description, DRM_RECT_ARG(&t->r1), DRM_RECT_ARG(&t->r2));
}
KUNIT_ARRAY_PARAM(drm_rect_intersect, drm_rect_intersect_cases, drm_rect_intersect_case_desc);
static void drm_test_rect_intersect(struct kunit *test)
{
const struct drm_rect_intersect_case *params = test->param_value;
struct drm_rect r1_aux = params->r1;
bool visible;
visible = drm_rect_intersect(&r1_aux, ¶ms->r2);
KUNIT_EXPECT_EQ(test, visible, params->should_be_visible);
drm_rect_compare(test, &r1_aux, ¶ms->expected_intersection);
}
struct drm_rect_scale_case {
const char *name;
struct drm_rect src, dst;
int min_range, max_range;
int expected_scaling_factor;
};
static const struct drm_rect_scale_case drm_rect_scale_cases[] = {
{
.name = "normal use",
.src = DRM_RECT_INIT(0, 0, 2 << 16, 2 << 16),
.dst = DRM_RECT_INIT(0, 0, 1 << 16, 1 << 16),
.min_range = 0, .max_range = INT_MAX,
.expected_scaling_factor = 2,
},
{
.name = "out of max range",
.src = DRM_RECT_INIT(0, 0, 10 << 16, 10 << 16),
.dst = DRM_RECT_INIT(0, 0, 1 << 16, 1 << 16),
.min_range = 3, .max_range = 5,
.expected_scaling_factor = -ERANGE,
},
{
.name = "out of min range",
.src = DRM_RECT_INIT(0, 0, 2 << 16, 2 << 16),
.dst = DRM_RECT_INIT(0, 0, 1 << 16, 1 << 16),
.min_range = 3, .max_range = 5,
.expected_scaling_factor = -ERANGE,
},
{
.name = "zero dst",
.src = DRM_RECT_INIT(0, 0, 2 << 16, 2 << 16),
.dst = DRM_RECT_INIT(0, 0, 0 << 16, 0 << 16),
.min_range = 0, .max_range = INT_MAX,
.expected_scaling_factor = 0,
},
{
.name = "negative src",
.src = DRM_RECT_INIT(0, 0, -(1 << 16), -(1 << 16)),
.dst = DRM_RECT_INIT(0, 0, 1 << 16, 1 << 16),
.min_range = 0, .max_range = INT_MAX,
.expected_scaling_factor = -EINVAL,
},
{
.name = "negative dst",
.src = DRM_RECT_INIT(0, 0, 1 << 16, 1 << 16),
.dst = DRM_RECT_INIT(0, 0, -(1 << 16), -(1 << 16)),
.min_range = 0, .max_range = INT_MAX,
.expected_scaling_factor = -EINVAL,
},
};
static void drm_rect_scale_case_desc(const struct drm_rect_scale_case *t, char *desc)
{
strscpy(desc, t->name, KUNIT_PARAM_DESC_SIZE);
}
KUNIT_ARRAY_PARAM(drm_rect_scale, drm_rect_scale_cases, drm_rect_scale_case_desc);
static void drm_test_rect_calc_hscale(struct kunit *test)
{
const struct drm_rect_scale_case *params = test->param_value;
int scaling_factor;
scaling_factor = drm_rect_calc_hscale(¶ms->src, ¶ms->dst,
params->min_range, params->max_range);
KUNIT_EXPECT_EQ(test, scaling_factor, params->expected_scaling_factor);
}
static void drm_test_rect_calc_vscale(struct kunit *test)
{
const struct drm_rect_scale_case *params = test->param_value;
int scaling_factor;
scaling_factor = drm_rect_calc_vscale(¶ms->src, ¶ms->dst,
params->min_range, params->max_range);
KUNIT_EXPECT_EQ(test, scaling_factor, params->expected_scaling_factor);
}
static struct kunit_case drm_rect_tests[] = {
KUNIT_CASE(drm_test_rect_clip_scaled_div_by_zero),
KUNIT_CASE(drm_test_rect_clip_scaled_not_clipped),
KUNIT_CASE(drm_test_rect_clip_scaled_clipped),
KUNIT_CASE(drm_test_rect_clip_scaled_signed_vs_unsigned),
KUNIT_CASE_PARAM(drm_test_rect_intersect, drm_rect_intersect_gen_params),
KUNIT_CASE_PARAM(drm_test_rect_calc_hscale, drm_rect_scale_gen_params),
KUNIT_CASE_PARAM(drm_test_rect_calc_vscale, drm_rect_scale_gen_params),
{ }
};
static struct kunit_suite drm_rect_test_suite = {
.name = "drm_rect",
.test_cases = drm_rect_tests,
};
kunit_test_suite(drm_rect_test_suite);
MODULE_LICENSE("GPL");
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