From 452290f354f04fca53cba810bd241f4307502f1e Mon Sep 17 00:00:00 2001 From: Thomas Zimmermann Date: Wed, 10 Nov 2021 11:36:54 +0100 Subject: drm/format-helper: Export drm_fb_clip_offset() MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Provide a function that computes the offset into a blit destination buffer. This will allow to move destination-buffer clipping into the format-helper callers. v4: * add missing '@' for parameter documentation * fix typo 'frambuffer' v2: * provide documentation (Sam) * return 'unsigned int' (Sam, Noralf) Signed-off-by: Thomas Zimmermann Reviewed-by: Noralf Trønnes Link: https://patchwork.freedesktop.org/patch/msgid/20211110103702.374-2-tzimmermann@suse.de --- drivers/gpu/drm/drm_format_helper.c | 19 +++++++++++++++++-- 1 file changed, 17 insertions(+), 2 deletions(-) (limited to 'drivers/gpu/drm/drm_format_helper.c') 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 @@ -17,12 +17,27 @@ #include #include -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 -- cgit v1.2.3