Commit 01b68b04 authored by Ville Syrjälä's avatar Ville Syrjälä Committed by Dave Airlie
Browse files

drm: Add drm_format_{horz, vert}_chroma_subsampling() utility functions 



These functions return the chroma subsampling factors for the specified
pixel format.

Signed-off-by: default avatarVille Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: default avatarDave Airlie <airlied@redhat.com>
parent 5a86bd55

drivers/gpu/drm/drm_crtc.c

+60 −0
Original line number Diff line number Diff line
@@ -3543,3 +3543,63 @@ int drm_format_plane_cpp(uint32_t format, int plane) 
	}

}

EXPORT_SYMBOL(drm_format_plane_cpp);



/**

 * drm_format_horz_chroma_subsampling - get the horizontal chroma subsampling factor

 * @format: pixel format (DRM_FORMAT_*)

 *

 * RETURNS:

 * The horizontal chroma subsampling factor for the

 * specified pixel format.

 */

int drm_format_horz_chroma_subsampling(uint32_t format)

{

	switch (format) {

	case DRM_FORMAT_YUV411:

	case DRM_FORMAT_YVU411:

	case DRM_FORMAT_YUV410:

	case DRM_FORMAT_YVU410:

		return 4;

	case DRM_FORMAT_YUYV:

	case DRM_FORMAT_YVYU:

	case DRM_FORMAT_UYVY:

	case DRM_FORMAT_VYUY:

	case DRM_FORMAT_NV12:

	case DRM_FORMAT_NV21:

	case DRM_FORMAT_NV16:

	case DRM_FORMAT_NV61:

	case DRM_FORMAT_YUV422:

	case DRM_FORMAT_YVU422:

	case DRM_FORMAT_YUV420:

	case DRM_FORMAT_YVU420:

		return 2;

	default:

		return 1;

	}

}

EXPORT_SYMBOL(drm_format_horz_chroma_subsampling);



/**

 * drm_format_vert_chroma_subsampling - get the vertical chroma subsampling factor

 * @format: pixel format (DRM_FORMAT_*)

 *

 * RETURNS:

 * The vertical chroma subsampling factor for the

 * specified pixel format.

 */

int drm_format_vert_chroma_subsampling(uint32_t format)

{

	switch (format) {

	case DRM_FORMAT_YUV410:

	case DRM_FORMAT_YVU410:

		return 4;

	case DRM_FORMAT_YUV420:

	case DRM_FORMAT_YVU420:

	case DRM_FORMAT_NV12:

	case DRM_FORMAT_NV21:

		return 2;

	default:

		return 1;

	}

}

EXPORT_SYMBOL(drm_format_vert_chroma_subsampling);

include/drm/drm_crtc.h

+2 −0
Original line number Diff line number Diff line
@@ -1028,5 +1028,7 @@ extern void drm_fb_get_bpp_depth(uint32_t format, unsigned int *depth, 
				 int *bpp);

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);



#endif /* __DRM_CRTC_H__ */