diff options
Diffstat (limited to 'drivers/gpu/drm/drm_format_helper.c')
| -rw-r--r-- | drivers/gpu/drm/drm_format_helper.c | 19 |
1 files changed, 17 insertions, 2 deletions
diff --git a/drivers/gpu/drm/drm_format_helper.c b/drivers/gpu/drm/drm_format_helper.c index 69fde60e36b3..9d2a4c27689b 100644 --- a/drivers/gpu/drm/drm_format_helper.c +++ b/drivers/gpu/drm/drm_format_helper.c @@ -17,13 +17,28 @@ #include <drm/drm_fourcc.h> #include <drm/drm_rect.h> -static unsigned int clip_offset(struct drm_rect *clip, - unsigned int pitch, unsigned int cpp) +static unsigned int clip_offset(const struct drm_rect *clip, unsigned int pitch, unsigned int cpp) { return clip->y1 * pitch + clip->x1 * cpp; } /** + * drm_fb_clip_offset - Returns the clipping rectangles byte-offset in a framebuffer + * @pitch: Framebuffer line pitch in byte + * @format: Framebuffer format + * @clip: Clip rectangle + * + * Returns: + * The byte offset of the clip rectangle's top-left corner within the framebuffer. + */ +unsigned int drm_fb_clip_offset(unsigned int pitch, const struct drm_format_info *format, + const struct drm_rect *clip) +{ + return clip_offset(clip, pitch, format->cpp[0]); +} +EXPORT_SYMBOL(drm_fb_clip_offset); + +/** * drm_fb_memcpy - Copy clip buffer * @dst: Destination buffer * @vaddr: Source buffer |