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| author | Ville Syrjälä <ville.syrjala@linux.intel.com> | 2016-02-09 18:29:44 +0300 |
|---|---|---|
| committer | Daniel Vetter <daniel.vetter@ffwll.ch> | 2016-02-09 18:34:58 +0300 |
| commit | 4c61716c2bfaaf1b8837a67775662008b4f42225 (patch) | |
| tree | 8a021f28c7b77af73b159a40e66a9a7893fea438 /drivers/gpu/drm/drm_crtc.c | |
| parent | e9f8250f2f92b0e087aef84a33014372375c73db (diff) | |
| download | linux-4c61716c2bfaaf1b8837a67775662008b4f42225.tar.xz | |
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: 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
Diffstat (limited to 'drivers/gpu/drm/drm_crtc.c')
| -rw-r--r-- | drivers/gpu/drm/drm_crtc.c | 42 |
1 files changed, 42 insertions, 0 deletions
diff --git a/drivers/gpu/drm/drm_crtc.c b/drivers/gpu/drm/drm_crtc.c index 4132d58dab93..65258acddb90 100644 --- a/drivers/gpu/drm/drm_crtc.c +++ b/drivers/gpu/drm/drm_crtc.c @@ -5738,6 +5738,48 @@ 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 * @supported_rotations: Supported rotations |