mirror of https://gitee.com/openkylin/linux.git
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
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@ -5737,6 +5737,48 @@ int drm_format_vert_chroma_subsampling(uint32_t format)
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}
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EXPORT_SYMBOL(drm_format_vert_chroma_subsampling);
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/**
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* drm_format_plane_width - width of the plane given the first plane
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* @width: width of the first plane
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* @format: pixel format
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* @plane: plane index
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*
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* Returns:
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* The width of @plane, given that the width of the first plane is @width.
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*/
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int drm_format_plane_width(int width, uint32_t format, int plane)
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{
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if (plane >= drm_format_num_planes(format))
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return 0;
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if (plane == 0)
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return width;
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return width / drm_format_horz_chroma_subsampling(format);
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}
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EXPORT_SYMBOL(drm_format_plane_width);
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/**
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* drm_format_plane_height - height of the plane given the first plane
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* @height: height of the first plane
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* @format: pixel format
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* @plane: plane index
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*
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* Returns:
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* The height of @plane, given that the height of the first plane is @height.
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*/
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int drm_format_plane_height(int height, uint32_t format, int plane)
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{
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if (plane >= drm_format_num_planes(format))
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return 0;
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if (plane == 0)
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return height;
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return height / drm_format_vert_chroma_subsampling(format);
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}
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EXPORT_SYMBOL(drm_format_plane_height);
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/**
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* drm_rotation_simplify() - Try to simplify the rotation
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* @rotation: Rotation to be simplified
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@ -2498,6 +2498,8 @@ extern int drm_format_num_planes(uint32_t format);
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extern int drm_format_plane_cpp(uint32_t format, int plane);
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extern int drm_format_horz_chroma_subsampling(uint32_t format);
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extern int drm_format_vert_chroma_subsampling(uint32_t format);
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extern int drm_format_plane_width(int width, uint32_t format, int plane);
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extern int drm_format_plane_height(int height, uint32_t format, int plane);
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extern const char *drm_get_format_name(uint32_t format);
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extern struct drm_property *drm_mode_create_rotation_property(struct drm_device *dev,
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unsigned int supported_rotations);
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