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drm/format-helper: Comment on RGB888 byte order

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RGB888 is different than the other formats as most of its pixels are
unaligned and therefore helper functions do not use endianness conversion
helpers. Comment on this in the source code.

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Maíra Canal <mcanal@igalia.com>
Reviewed-by: José Expósito <jose.exposito89@gmail.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230102112927.26565-3-tzimmermann@suse.de
This commit is contained in:
Thomas Zimmermann 2023-01-02 12:29:16 +01:00
parent f35cd3fa77
commit a5b1a681dc
2 changed files with 5 additions and 0 deletions
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1
drivers/gpu/drm/drm_format_helper.c
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@ -404,6 +404,7 @@ static void drm_fb_xrgb8888_to_rgb888_line(void *dbuf, const void *sbuf, unsigne
for (x = 0; x < pixels; x++) {
pix = le32_to_cpu(sbuf32[x]);
/* write blue-green-red to output in little endianness */
*dbuf8++ = (pix & 0x000000FF) >> 0;
*dbuf8++ = (pix & 0x0000FF00) >> 8;
*dbuf8++ = (pix & 0x00FF0000) >> 16;

4
drivers/gpu/drm/tests/drm_format_helper_test.c
View file

@ -407,6 +407,10 @@ static void drm_test_fb_xrgb8888_to_rgb888(struct kunit *test)
KUNIT_ASSERT_NOT_ERR_OR_NULL(test, xrgb8888);
iosys_map_set_vaddr(&src, xrgb8888);
/*
* RGB888 expected results are already in little-endian
* order, so there's no need to convert the test output.
*/
drm_fb_xrgb8888_to_rgb888(&dst, &result->dst_pitch, &src, &fb, &params->clip);
KUNIT_EXPECT_EQ(test, memcmp(buf, result->expected, dst_size), 0);
}