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) v3: Fix kerneldoc "Returns:" style (Daniel) Uninline the functions and check for num_planes (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 --- drivers/gpu/drm/drm_crtc.c | 40 ++++++++++++++++++++++++++++++++++++++++ include/drm/drm_crtc.h | 2 ++ 2 files changed, 42 insertions(+)
diff --git a/drivers/gpu/drm/drm_crtc.c b/drivers/gpu/drm/drm_crtc.c index 6e6514ef9968..c708b37972de 100644 --- a/drivers/gpu/drm/drm_crtc.c +++ b/drivers/gpu/drm/drm_crtc.c @@ -5715,6 +5715,46 @@ int drm_format_vert_chroma_subsampling(uint32_t format) EXPORT_SYMBOL(drm_format_vert_chroma_subsampling);
/** + * 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. + */ +int drm_format_plane_width(int width, uint32_t format, int plane) +{ + if (plane >= drm_format_num_planes(format)) + return 0; + + 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. + */ +int drm_format_plane_height(int height, uint32_t format, int plane) +{ + if (plane >= drm_format_num_planes(format)) + return 0; + + if (plane == 0) + return height; + + return height / drm_format_vert_chroma_subsampling(format); +} + +/** * drm_rotation_simplify() - Try to simplify the rotation * @rotation: Rotation to be simplified * @supported_rotations: Supported rotations diff --git a/include/drm/drm_crtc.h b/include/drm/drm_crtc.h index c65a212db77e..3a4b53ecd121 100644 --- a/include/drm/drm_crtc.h +++ b/include/drm/drm_crtc.h @@ -2482,6 +2482,8 @@ 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); +extern int drm_format_plane_width(int width, uint32_t format, int plane); +extern int drm_format_plane_height(int height, uint32_t format, int plane); 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);