[PATCH 01/22] drm: Add drm_format_plane_width() and drm_format_plane_height()

[Daniel Vetter]

On Wed, Oct 14, 2015 at 07:28:53PM +0300, ville.syrjala at linux.intel.com wrote:
> From: Ville Syrjälä <ville.syrjala at linux.intel.com>
> 
> Add a few helpers to get the dimensions of the chroma plane(s).
> 
> Cc: dri-devel at lists.freedesktop.org
> Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
> ---
>  include/drm/drm_crtc.h | 12 ++++++++++++
>  1 file changed, 12 insertions(+)
> 
> diff --git a/include/drm/drm_crtc.h b/include/drm/drm_crtc.h
> index 33ddedd..317baf9 100644
> --- a/include/drm/drm_crtc.h
> +++ b/include/drm/drm_crtc.h
> @@ -1497,6 +1497,18 @@ extern int drm_format_num_planes(uint32_t format);
>  extern int drm_format_plane_cpp(uint32_t format, int plane);
>  extern int drm_format_horz_chroma_subsampling(uint32_t format);
>  extern int drm_format_vert_chroma_subsampling(uint32_t format);
> +static inline int drm_format_plane_width(int width, uint32_t format, int plane)
> +{
> +	if (plane == 0)
> +		return width;
> +	return width / drm_format_horz_chroma_subsampling(format);
> +}
> +static inline int drm_format_plane_height(int height, uint32_t format, int plane)
> +{
> +	if (plane == 0)
> +		return height;
> +	return height / drm_format_vert_chroma_subsampling(format);
> +}

A bit of kerneldoc would be neat. Either way Reviewed-by: Daniel Vetter <daniel.vetter at ffwll.ch>

>  extern const char *drm_get_format_name(uint32_t format);
>  extern struct drm_property *drm_mode_create_rotation_property(struct drm_device *dev,
>  							      unsigned int supported_rotations);
> -- 
> 2.4.9
> 
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-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch