diff options
| -rw-r--r-- | drivers/gpu/drm/drm_framebuffer.c | 44 | ||||
| -rw-r--r-- | include/drm/drm_framebuffer.h | 6 |
2 files changed, 50 insertions, 0 deletions
diff --git a/drivers/gpu/drm/drm_framebuffer.c b/drivers/gpu/drm/drm_framebuffer.c index 892976d974e5..22071d7e3420 100644 --- a/drivers/gpu/drm/drm_framebuffer.c +++ b/drivers/gpu/drm/drm_framebuffer.c @@ -793,3 +793,47 @@ void drm_framebuffer_remove(struct drm_framebuffer *fb) drm_framebuffer_unreference(fb); } EXPORT_SYMBOL(drm_framebuffer_remove); + +/** + * drm_framebuffer_plane_width - width of the plane given the first plane + * @width: width of the first plane + * @fb: the framebuffer + * @plane: plane index + * + * Returns: + * The width of @plane, given that the width of the first plane is @width. + */ +int drm_framebuffer_plane_width(int width, + const struct drm_framebuffer *fb, int plane) +{ + if (plane >= fb->format->num_planes) + return 0; + + if (plane == 0) + return width; + + return width / fb->format->hsub; +} +EXPORT_SYMBOL(drm_framebuffer_plane_width); + +/** + * drm_framebuffer_plane_height - height of the plane given the first plane + * @height: height of the first plane + * @fb: the framebuffer + * @plane: plane index + * + * Returns: + * The height of @plane, given that the height of the first plane is @height. + */ +int drm_framebuffer_plane_height(int height, + const struct drm_framebuffer *fb, int plane) +{ + if (plane >= fb->format->num_planes) + return 0; + + if (plane == 0) + return height; + + return height / fb->format->vsub; +} +EXPORT_SYMBOL(drm_framebuffer_plane_height); diff --git a/include/drm/drm_framebuffer.h b/include/drm/drm_framebuffer.h index a3d2f25230a8..79640c3e7ec4 100644 --- a/include/drm/drm_framebuffer.h +++ b/include/drm/drm_framebuffer.h @@ -286,4 +286,10 @@ static inline void drm_framebuffer_assign(struct drm_framebuffer **p, struct drm_framebuffer, head); \ &fb->head != (&(dev)->mode_config.fb_list); \ fb = list_next_entry(fb, head)) + +int drm_framebuffer_plane_width(int width, + const struct drm_framebuffer *fb, int plane); +int drm_framebuffer_plane_height(int height, + const struct drm_framebuffer *fb, int plane); + #endif |