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drm/format-helper: Add generic conversion to 8-bit formats

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Add drm_fb_xfrm_line_32to8() to implement conversion from 32-bit
pixels to 8-bit pixels. The pixel-conversion is specified by the
given callback parameter. Mark the helper as always_inline to avoid
overhead from function calls.

Then implement all existing line-conversion functions with the new
generic call and the respective pixel-conversion helper.

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Jocelyn Falempe <jfalempe@redhat.com>
Link: https://lore.kernel.org/r/20250328141709.217283-6-tzimmermann@suse.de
This commit is contained in:
Thomas Zimmermann 2025-03-28 15:15:01 +01:00
parent b39e5ba0cc
commit a376dcf49c
2 changed files with 31 additions and 24 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

38
drivers/gpu/drm/drm_format_helper.c
View file

@ -246,6 +246,18 @@ static int drm_fb_xfrm(struct iosys_map *dst,
xfrm_line);
}
static __always_inline void drm_fb_xfrm_line_32to8(void *dbuf, const void *sbuf,
unsigned int pixels,
u32 (*xfrm_pixel)(u32))
{
u8 *dbuf8 = dbuf;
const __le32 *sbuf32 = sbuf;
const __le32 *send32 = sbuf32 + pixels;
while (sbuf32 < send32)
*dbuf8++ = xfrm_pixel(le32_to_cpup(sbuf32++));
}
static __always_inline void drm_fb_xfrm_line_32to16(void *dbuf, const void *sbuf,
unsigned int pixels,
u32 (*xfrm_pixel)(u32))
@ -411,17 +423,7 @@ EXPORT_SYMBOL(drm_fb_swab);
static void drm_fb_xrgb8888_to_rgb332_line(void *dbuf, const void *sbuf, unsigned int pixels)
{
u8 *dbuf8 = dbuf;
const __le32 *sbuf32 = sbuf;
unsigned int x;
u32 pix;
for (x = 0; x < pixels; x++) {
pix = le32_to_cpu(sbuf32[x]);
dbuf8[x] = ((pix & 0x00e00000) >> 16) |
((pix & 0x0000e000) >> 11) |
((pix & 0x000000c0) >> 6);
}
drm_fb_xfrm_line_32to8(dbuf, sbuf, pixels, drm_pixel_xrgb8888_to_rgb332);
}
/**
@ -879,19 +881,7 @@ EXPORT_SYMBOL(drm_fb_xrgb8888_to_argb2101010);
static void drm_fb_xrgb8888_to_gray8_line(void *dbuf, const void *sbuf, unsigned int pixels)
{
u8 *dbuf8 = dbuf;
const __le32 *sbuf32 = sbuf;
unsigned int x;
for (x = 0; x < pixels; x++) {
u32 pix = le32_to_cpu(sbuf32[x]);
u8 r = (pix & 0x00ff0000) >> 16;
u8 g = (pix & 0x0000ff00) >> 8;
u8 b = pix & 0x000000ff;
/* ITU BT.601: Y = 0.299 R + 0.587 G + 0.114 B */
*dbuf8++ = (3 * r + 6 * g + b) / 10;
}
drm_fb_xfrm_line_32to8(dbuf, sbuf, pixels, drm_pixel_xrgb8888_to_r8_bt601);
}
/**

17
drivers/gpu/drm/drm_format_internal.h
View file

@ -35,6 +35,23 @@
* Conversions from XRGB8888
*/
static inline u32 drm_pixel_xrgb8888_to_r8_bt601(u32 pix)
{
u32 r = (pix & 0x00ff0000) >> 16;
u32 g = (pix & 0x0000ff00) >> 8;
u32 b = pix & 0x000000ff;
/* ITU-R BT.601: Y = 0.299 R + 0.587 G + 0.114 B */
return (3 * r + 6 * g + b) / 10;
}
static inline u32 drm_pixel_xrgb8888_to_rgb332(u32 pix)
{
return ((pix & 0x00e00000) >> 16) |
((pix & 0x0000e000) >> 11) |
((pix & 0x000000c0) >> 6);
}
static inline u32 drm_pixel_xrgb8888_to_rgb565(u32 pix)
{
return ((pix & 0x00f80000) >> 8) |