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drm: Clarify DRM_MODE_REFLECT_X/Y documentation

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DRM_MODE_REFLECT_X and DRM_MODE_REFLECT_Y meaning seems a bit unclear
to me, so try to clarify that with a bit of ascii graphics.

Changes since v1:
  - Move the ascii graphics in the kerneldoc where all plane
    properties are already documented and make sure it's properly
    rendered, suggestested by Daniel Vetter.

Signed-off-by: Alexandru Gheorghe <alexandru-cosmin.gheorghe@arm.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20180910172946.18539-1-alexandru-cosmin.gheorghe@arm.com
This commit is contained in:
Alexandru Gheorghe 2018-09-10 18:29:46 +01:00
parent 5248092ea4
commit 1f86fa1534
2 changed files with 24 additions and 1 deletions
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22
drivers/gpu/drm/drm_blend.c
View File

@ -101,6 +101,28 @@
* Without this property the rectangle is only scaled, but not rotated or
* reflected.
*
* Possbile values:
*
* "rotate-<degrees>":
* Signals that a drm plane is rotated <degrees> degrees in counter
* clockwise direction.
*
* "reflect-<axis>":
* Signals that the contents of a drm plane is reflected along the
* <axis> axis, in the same way as mirroring.
*
* reflect-x::
*
* |o | | o|
* | | -> | |
* | v| |v |
*
* reflect-y::
*
* |o | | ^|
* | | -> | |
* | v| |o |
*
* zpos:
* Z position is set up with drm_plane_create_zpos_immutable_property() and
* drm_plane_create_zpos_property(). It controls the visibility of overlapping

3
include/uapi/drm/drm_mode.h
View File

@ -186,8 +186,9 @@ extern "C" {
/*
* DRM_MODE_REFLECT_<axis>
*
* Signals that the contents of a drm plane is reflected in the <axis> axis,
* Signals that the contents of a drm plane is reflected along the <axis> axis,
* in the same way as mirroring.
* See kerneldoc chapter "Plane Composition Properties" for more details.
*
* This define is provided as a convenience, looking up the property id
* using the name->prop id lookup is the preferred method.