drivers/gpu/drm/tests/drm_rect_test.c

Source file repositories/reference/linux-study-clean/drivers/gpu/drm/tests/drm_rect_test.c

File Facts

System: Linux kernel
Corpus path: drivers/gpu/drm/tests/drm_rect_test.c
Extension: .c
Size: 18591 bytes
Lines: 565
Domain: Driver Families
Bucket: drivers/gpu
Inferred role: Driver Families: implementation source
Status: source implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.
Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.

Dependency Surface

kunit/test.h
drm/drm_rect.h
drm/drm_mode.h
linux/limits.h
linux/string_helpers.h
linux/errno.h

Detected Declarations

struct drm_rect_intersect_case
struct drm_rect_scale_case
struct drm_rect_rotate_case
function Copyright
function drm_test_rect_clip_scaled_div_by_zero
function drm_test_rect_clip_scaled_not_clipped
function drm_test_rect_clip_scaled_clipped
function drm_test_rect_clip_scaled_signed_vs_unsigned
function drm_rect_intersect_case_desc
function drm_test_rect_intersect
function drm_rect_scale_case_desc
function drm_test_rect_calc_hscale
function drm_rect_calc_hscale
function drm_test_rect_calc_vscale
function drm_rect_calc_vscale
function drm_rect_rotate_case_desc
function drm_test_rect_rotate
function drm_test_rect_rotate_inv

Annotated Snippet

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,

Annotation

Immediate include surface: `kunit/test.h`, `drm/drm_rect.h`, `drm/drm_mode.h`, `linux/limits.h`, `linux/string_helpers.h`, `linux/errno.h`.
Detected declarations: `struct drm_rect_intersect_case`, `struct drm_rect_scale_case`, `struct drm_rect_rotate_case`, `function Copyright`, `function drm_test_rect_clip_scaled_div_by_zero`, `function drm_test_rect_clip_scaled_not_clipped`, `function drm_test_rect_clip_scaled_clipped`, `function drm_test_rect_clip_scaled_signed_vs_unsigned`, `function drm_rect_intersect_case_desc`, `function drm_test_rect_intersect`.
Atlas domain: Driver Families / drivers/gpu.
Implementation status: source implementation candidate.

Implementation Notes

This generated page is the file-by-file coverage layer; curated subsystem chapters should link here when they synthesize a multi-file control flow.
Core OS pages should be promoted from atlas-only to deep-reviewed when they explain data structures, invariants, locking, lifecycle, and C implementation snippets.
Driver-family pages are intentionally pattern-oriented unless they are part of the selected PCIe/NVMe representative device path.