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Commit 4c61716c authored by Ville Syrjälä's avatar Ville Syrjälä Committed by Daniel Vetter
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drm: Add drm_format_plane_width() and drm_format_plane_height() 



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)
v4: Add the required EXPORT_SYMBOL()s

Cc: dri-devel@lists.freedesktop.org
Signed-off-by: default avatarVille Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: default avatarDaniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: default avatarDaniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/1455031784-10941-1-git-send-email-ville.syrjala@linux.intel.com
parent e9f8250f

drivers/gpu/drm/drm_crtc.c

+42 −0
Original line number Diff line number Diff line
@@ -5737,6 +5737,48 @@ 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);

}

EXPORT_SYMBOL(drm_format_plane_width);



/**

 * 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);

}

EXPORT_SYMBOL(drm_format_plane_height);



/**

 * drm_rotation_simplify() - Try to simplify the rotation

 * @rotation: Rotation to be simplified

include/drm/drm_crtc.h

+2 −0
Original line number Diff line number Diff line
@@ -2498,6 +2498,8 @@ 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);