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drm/format-helper: Export drm_fb_clip_offset()

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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 <tzimmermann@suse.de>
Reviewed-by: Noralf Trønnes <noralf@tronnes.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20211110103702.374-2-tzimmermann@suse.de
This commit is contained in:
Thomas Zimmermann 2021-11-10 11:36:54 +01:00
parent 396d9b9a48
commit 452290f354
2 changed files with 21 additions and 2 deletions
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19
drivers/gpu/drm/drm_format_helper.c
View file

@ -17,12 +17,27 @@
#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

4
include/drm/drm_format_helper.h
View file

@ -6,9 +6,13 @@
#ifndef __LINUX_DRM_FORMAT_HELPER_H
#define __LINUX_DRM_FORMAT_HELPER_H
struct drm_format_info;
struct drm_framebuffer;
struct drm_rect;
unsigned int drm_fb_clip_offset(unsigned int pitch, const struct drm_format_info *format,
const struct drm_rect *clip);
void drm_fb_memcpy(void *dst, void *vaddr, struct drm_framebuffer *fb,
struct drm_rect *clip);
void drm_fb_memcpy_dstclip(void __iomem *dst, unsigned int dst_pitch, void *vaddr,