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drm: Add drm_format_plane_width() and drm_format_plane_height()

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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: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/1455031784-10941-1-git-send-email-ville.syrjala@linux.intel.com
This commit is contained in:
Ville Syrjälä 2016-02-09 17:29:44 +02:00 committed by Daniel Vetter
parent e9f8250f2f
commit 4c61716c2b
2 changed files with 44 additions and 0 deletions
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42
drivers/gpu/drm/drm_crtc.c
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@ -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

2
include/drm/drm_crtc.h
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@ -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);