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drm: Add drm_format_plane_cpp() utility function 

This function returns the bytes per pixel value based on the pixel
format and plane index.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
This commit is contained in:
Ville Syrjälä 2012-04-05 21:35:16 +03:00 committed by Dave Airlie
parent 141670e9b4
commit 5a86bd5524
2 changed files with 46 additions and 0 deletions
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45
drivers/gpu/drm/drm_crtc.c
View File

@ -3498,3 +3498,48 @@ int drm_format_num_planes(uint32_t format)
}
}
EXPORT_SYMBOL(drm_format_num_planes);
/**
* drm_format_plane_cpp - determine the bytes per pixel value
* @format: pixel format (DRM_FORMAT_*)
* @plane: plane index
*
* RETURNS:
* The bytes per pixel value for the specified plane.
*/
int drm_format_plane_cpp(uint32_t format, int plane)
{
unsigned int depth;
int bpp;
if (plane >= drm_format_num_planes(format))
return 0;
switch (format) {
case DRM_FORMAT_YUYV:
case DRM_FORMAT_YVYU:
case DRM_FORMAT_UYVY:
case DRM_FORMAT_VYUY:
return 2;
case DRM_FORMAT_NV12:
case DRM_FORMAT_NV21:
case DRM_FORMAT_NV16:
case DRM_FORMAT_NV61:
return plane ? 2 : 1;
case DRM_FORMAT_YUV410:
case DRM_FORMAT_YVU410:
case DRM_FORMAT_YUV411:
case DRM_FORMAT_YVU411:
case DRM_FORMAT_YUV420:
case DRM_FORMAT_YVU420:
case DRM_FORMAT_YUV422:
case DRM_FORMAT_YVU422:
case DRM_FORMAT_YUV444:
case DRM_FORMAT_YVU444:
return 1;
default:
drm_fb_get_bpp_depth(format, &depth, &bpp);
return bpp >> 3;
}
}
EXPORT_SYMBOL(drm_format_plane_cpp);

1
include/drm/drm_crtc.h
View File

@ -1027,5 +1027,6 @@ extern int drm_mode_destroy_dumb_ioctl(struct drm_device *dev,
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);
#endif /* __DRM_CRTC_H__ */