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drm/format-helper: Add drm_fb_xrgb8888_to_rgb888()

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Add XRGB8888 emulation support for devices that can only do RGB888.

Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Acked-by: Thomas Zimmermann <tzimmermann@suse.de>
Signed-off-by: Noralf Trønnes <noralf@tronnes.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20210929191201.34456-4-noralf@tronnes.org
This commit is contained in:
Noralf Trønnes
2021-09-29 21:11:58 +02:00
parent cee0b7cbf1
commit bcf80d6ef1
2 changed files with 40 additions and 0 deletions
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38
drivers/gpu/drm/drm_format_helper.c
View File

@ -300,6 +300,44 @@ static void drm_fb_xrgb8888_to_rgb888_line(u8 *dbuf, u32 *sbuf,
}
}
/**
* drm_fb_xrgb8888_to_rgb888 - Convert XRGB8888 to RGB888 clip buffer
* @dst: RGB888 destination buffer
* @src: XRGB8888 source buffer
* @fb: DRM framebuffer
* @clip: Clip rectangle area to copy
*
* Drivers can use this function for RGB888 devices that don't natively
* support XRGB8888.
*
* This function does not apply clipping on dst, i.e. the destination
* is a small buffer containing the clip rect only.
*/
void drm_fb_xrgb8888_to_rgb888(void *dst, void *src, struct drm_framebuffer *fb,
struct drm_rect *clip)
{
size_t width = drm_rect_width(clip);
size_t src_len = width * sizeof(u32);
unsigned int y;
void *sbuf;
/* Use a buffer to speed up access on buffers with uncached read mapping (i.e. WC) */
sbuf = kmalloc(src_len, GFP_KERNEL);
if (!sbuf)
return;
src += clip_offset(clip, fb->pitches[0], sizeof(u32));
for (y = 0; y < drm_rect_height(clip); y++) {
memcpy(sbuf, src, src_len);
drm_fb_xrgb8888_to_rgb888_line(dst, sbuf, width);
src += fb->pitches[0];
dst += width * 3;
}
kfree(sbuf);
}
EXPORT_SYMBOL(drm_fb_xrgb8888_to_rgb888);
/**
* drm_fb_xrgb8888_to_rgb888_dstclip - Convert XRGB8888 to RGB888 clip buffer
* @dst: RGB565 destination buffer (iomem)

2
include/drm/drm_format_helper.h
View File

@ -24,6 +24,8 @@ void drm_fb_xrgb8888_to_rgb565(void *dst, void *vaddr,
void drm_fb_xrgb8888_to_rgb565_dstclip(void __iomem *dst, unsigned int dst_pitch,
void *vaddr, struct drm_framebuffer *fb,
struct drm_rect *clip, bool swab);
void drm_fb_xrgb8888_to_rgb888(void *dst, void *src, struct drm_framebuffer *fb,
struct drm_rect *clip);
void drm_fb_xrgb8888_to_rgb888_dstclip(void __iomem *dst, unsigned int dst_pitch,
void *vaddr, struct drm_framebuffer *fb,
struct drm_rect *clip);