Commit bcf80d6e authored by Noralf Trønnes's avatar Noralf Trønnes
Browse files

drm/format-helper: Add drm_fb_xrgb8888_to_rgb888() 



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

Reviewed-by: default avatarDaniel Vetter <daniel.vetter@ffwll.ch>
Acked-by: default avatarThomas Zimmermann <tzimmermann@suse.de>
Signed-off-by: default avatarNoralf Trønnes <noralf@tronnes.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20210929191201.34456-4-noralf@tronnes.org
parent cee0b7cb

drivers/gpu/drm/drm_format_helper.c

+38 −0
Original line number Diff line number Diff line
@@ -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)

include/drm/drm_format_helper.h

+2 −0
Original line number Diff line number Diff line
@@ -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);