On Tue, 31 Jan 2017, Brian Starkey <brian.starkey@xxxxxxx> wrote:
> Explicitly state the expected CTM equations in the kerneldoc for the CTM
> property, and the form of the matrix on struct drm_color_ctm.
>
> Cc: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
> Cc: Lionel Landwerlin <lionel.g.landwerlin@xxxxxxxxx>
> Cc: Daniel Vetter <daniel.vetter@xxxxxxxx>
> Signed-off-by: Brian Starkey <brian.starkey@xxxxxxx>
> ---
> drivers/gpu/drm/drm_color_mgmt.c | 13 +++++++++++++
> include/uapi/drm/drm_mode.h | 8 +++++++-
> 2 files changed, 20 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/drm_color_mgmt.c b/drivers/gpu/drm/drm_color_mgmt.c
> index 789b4c65cd69..7573ca4b6ea6 100644
> --- a/drivers/gpu/drm/drm_color_mgmt.c
> +++ b/drivers/gpu/drm/drm_color_mgmt.c
> @@ -62,6 +62,19 @@
> * unit/pass-thru matrix should be used. This is generally the driver
> * boot-up state too.
> *
> + * The output vector is related to the input vector as below:
> + *
> + * | ``out[0] = matrix[0] * in[0] + matrix[1] * in[1] + matrix[2] * in[2];``
> + * | ``out[1] = matrix[3] * in[0] + matrix[4] * in[1] + matrix[5] * in[2];``
> + * | ``out[2] = matrix[6] * in[0] + matrix[7] * in[1] + matrix[8] * in[2];``
Would that not work better with a preformatted block? Replace the colon
in the preceding paragraph with the double colon ::, and indent the
block.
> + *
> + * The component order in the input/output vectors is assumed to be
> + * { R, G, B }.
> + *
> + * The color-space of the input vector must not be confused with the
> + * color-space implied by a framebuffer pixel format, which may be the same
> + * or different.
> + *
> * “GAMMA_LUT”:
> * Blob property to set the gamma lookup table (LUT) mapping pixel data
> * after the transformation matrix to data sent to the connector. The
> diff --git a/include/uapi/drm/drm_mode.h b/include/uapi/drm/drm_mode.h
> index ce7efe2e8a5e..3401637caf8e 100644
> --- a/include/uapi/drm/drm_mode.h
> +++ b/include/uapi/drm/drm_mode.h
> @@ -525,7 +525,13 @@ struct drm_mode_crtc_lut {
> };
>
> struct drm_color_ctm {
> - /* Conversion matrix in S31.32 format. */
> + /*
> + * Conversion matrix in S31.32 format, in row-major form:
> + *
> + * | matrix[0] matrix[1] matrix[2] |
> + * | matrix[3] matrix[4] matrix[5] |
> + * | matrix[6] matrix[7] matrix[8] |
> + */
Same here.
> __s64 matrix[9];
> };
--
Jani Nikula, Intel Open Source Technology Center
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