From: Ville Syrjälä ville.syrjala@linux.intel.com
Add a few helpers to get the dimensions of the chroma plane(s).
v2: Add kernel-doc (Daniel)
Cc: dri-devel@lists.freedesktop.org Signed-off-by: Ville Syrjälä ville.syrjala@linux.intel.com Reviewed-by: Daniel Vetter daniel.vetter@ffwll.ch --- include/drm/drm_crtc.h | 30 ++++++++++++++++++++++++++++++ 1 file changed, 30 insertions(+)
diff --git a/include/drm/drm_crtc.h b/include/drm/drm_crtc.h index c65a212db77e..91195c403422 100644 --- a/include/drm/drm_crtc.h +++ b/include/drm/drm_crtc.h @@ -2482,6 +2482,36 @@ 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); +/** + * drm_format_plane_width - width of the plane given the first plane + * @width: width of the first plane + * @format: pixel format + * @plane: plane index + * + * Returns the width of @plane, given that the width of the first plane + * is @width. + */ +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); +} +/** + * drm_format_plane_height - height of the plane given the first plane + * @height: height of the first plane + * @format: pixel format + * @plane: plane index + * + * Returns the height of @plane, given that the height of the first plane + * is @height. + */ +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); +} 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);