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Commit 1f86fa15 authored by Alexandru Gheorghe's avatar Alexandru Gheorghe
Browse files

drm: Clarify DRM_MODE_REFLECT_X/Y documentation 



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: default avatarAlexandru Gheorghe <alexandru-cosmin.gheorghe@arm.com>
Reviewed-by: default avatarDaniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20180910172946.18539-1-alexandru-cosmin.gheorghe@arm.com
parent 5248092e

drivers/gpu/drm/drm_blend.c

+22 −0
Original line number Diff line number Diff line
@@ -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

include/uapi/drm/drm_mode.h

+2 −1
Original line number Diff line number Diff line
@@ -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.