Re: [PATCH] drm/format-helper: Add conversion from XRGB8888 to BGR888

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Hi Thomas

I found upstreamed drivers which may be using this routine.

https://elixir.bootlin.com/linux/latest/A/ident/DRM_FORMAT_BGR888

I guess the same logic was used to upstream all these:

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/drivers/gpu/drm/drm_format_helper.c?h=v6.10-rc7&id=10cd592e639edcea50d781a07edcf3470d1f222e

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/drivers/gpu/drm/drm_format_helper.c?h=v6.10-rc7&id=56119bfb39142090fb84ac08a3f14dd48410e961

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/drivers/gpu/drm/drm_format_helper.c?h=v6.10-rc7&id=175073d694cd9db4c4ca97c978a447acc6b5cb33


My apologies if I am wrong somewhere.

________________________________________
From: Thomas Zimmermann <tzimmermann@xxxxxxx>
Sent: 08 July 2024 13:00
To: Aditya Garg; maarten.lankhorst@xxxxxxxxxxxxxxx; mripard@xxxxxxxxxx; airlied@xxxxxxxxx; daniel@xxxxxxxx
Cc: Orlando Chamberlain; Kerem Karabay; dri-devel@xxxxxxxxxxxxxxxxxxxxx; Linux Kernel Mailing List
Subject: Re: [PATCH] drm/format-helper: Add conversion from XRGB8888 to BGR888

Hi

Am 05.07.24 um 13:38 schrieb Aditya Garg:
> From: Kerem Karabay <kekrby@xxxxxxxxx>
>
> Add XRGB8888 emulation helper for devices that only support BGR888.

Nothing wrong with that, but it needs a caller. Do you have a driver
that uses this routine?

Best regards
Thomas

>
> Signed-off-by: Kerem Karabay <kekrby@xxxxxxxxx>
> Signed-off-by: Aditya Garg <gargaditya08@xxxxxxxx>
> ---
>   drivers/gpu/drm/drm_format_helper.c           | 54 +++++++++++++
>   .../gpu/drm/tests/drm_format_helper_test.c    | 81 +++++++++++++++++++
>   include/drm/drm_format_helper.h               |  3 +
>   3 files changed, 138 insertions(+)
>
> diff --git a/drivers/gpu/drm/drm_format_helper.c b/drivers/gpu/drm/drm_format_helper.c
> index b1be458ed..28c0e76a1 100644
> --- a/drivers/gpu/drm/drm_format_helper.c
> +++ b/drivers/gpu/drm/drm_format_helper.c
> @@ -702,6 +702,57 @@ void drm_fb_xrgb8888_to_rgb888(struct iosys_map *dst, const unsigned int *dst_pi
>   }
>   EXPORT_SYMBOL(drm_fb_xrgb8888_to_rgb888);
>
> +static void drm_fb_xrgb8888_to_bgr888_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]);
> +             /* write red-green-blue to output in little endianness */
> +             *dbuf8++ = (pix & 0x00FF0000) >> 16;
> +             *dbuf8++ = (pix & 0x0000FF00) >> 8;
> +             *dbuf8++ = (pix & 0x000000FF) >> 0;
> +     }
> +}
> +
> +/**
> + * drm_fb_xrgb8888_to_bgr888 - Convert XRGB8888 to BGR888 clip buffer
> + * @dst: Array of BGR888 destination buffers
> + * @dst_pitch: Array of numbers of bytes between the start of two consecutive scanlines
> + *             within @dst; can be NULL if scanlines are stored next to each other.
> + * @src: Array of XRGB8888 source buffers
> + * @fb: DRM framebuffer
> + * @clip: Clip rectangle area to copy
> + * @state: Transform and conversion state
> + *
> + * This function copies parts of a framebuffer to display memory and converts the
> + * color format during the process. Destination and framebuffer formats must match. The
> + * parameters @dst, @dst_pitch and @src refer to arrays. Each array must have at
> + * least as many entries as there are planes in @fb's format. Each entry stores the
> + * value for the format's respective color plane at the same index.
> + *
> + * This function does not apply clipping on @dst (i.e. the destination is at the
> + * top-left corner).
> + *
> + * Drivers can use this function for BGR888 devices that don't natively
> + * support XRGB8888.
> + */
> +void drm_fb_xrgb8888_to_bgr888(struct iosys_map *dst, const unsigned int *dst_pitch,
> +                            const struct iosys_map *src, const struct drm_framebuffer *fb,
> +                            const struct drm_rect *clip, struct drm_format_conv_state *state)
> +{
> +     static const u8 dst_pixsize[DRM_FORMAT_MAX_PLANES] = {
> +             3,
> +     };
> +
> +     drm_fb_xfrm(dst, dst_pitch, dst_pixsize, src, fb, clip, false, state,
> +                 drm_fb_xrgb8888_to_bgr888_line);
> +}
> +EXPORT_SYMBOL(drm_fb_xrgb8888_to_bgr888);
> +
>   static void drm_fb_xrgb8888_to_argb8888_line(void *dbuf, const void *sbuf, unsigned int pixels)
>   {
>       __le32 *dbuf32 = dbuf;
> @@ -1035,6 +1086,9 @@ int drm_fb_blit(struct iosys_map *dst, const unsigned int *dst_pitch, uint32_t d
>               } else if (dst_format == DRM_FORMAT_RGB888) {
>                       drm_fb_xrgb8888_to_rgb888(dst, dst_pitch, src, fb, clip, state);
>                       return 0;
> +             } else if (dst_format == DRM_FORMAT_BGR888) {
> +                     drm_fb_xrgb8888_to_bgr888(dst, dst_pitch, src, fb, clip, state);
> +                     return 0;
>               } else if (dst_format == DRM_FORMAT_ARGB8888) {
>                       drm_fb_xrgb8888_to_argb8888(dst, dst_pitch, src, fb, clip, state);
>                       return 0;
> diff --git a/drivers/gpu/drm/tests/drm_format_helper_test.c b/drivers/gpu/drm/tests/drm_format_helper_test.c
> index 08992636e..e54f0f6e7 100644
> --- a/drivers/gpu/drm/tests/drm_format_helper_test.c
> +++ b/drivers/gpu/drm/tests/drm_format_helper_test.c
> @@ -60,6 +60,11 @@ struct convert_to_rgb888_result {
>       const u8 expected[TEST_BUF_SIZE];
>   };
>
> +struct convert_to_bgr888_result {
> +     unsigned int dst_pitch;
> +     const u8 expected[TEST_BUF_SIZE];
> +};
> +
>   struct convert_to_argb8888_result {
>       unsigned int dst_pitch;
>       const u32 expected[TEST_BUF_SIZE];
> @@ -107,6 +112,7 @@ struct convert_xrgb8888_case {
>       struct convert_to_argb1555_result argb1555_result;
>       struct convert_to_rgba5551_result rgba5551_result;
>       struct convert_to_rgb888_result rgb888_result;
> +     struct convert_to_bgr888_result bgr888_result;
>       struct convert_to_argb8888_result argb8888_result;
>       struct convert_to_xrgb2101010_result xrgb2101010_result;
>       struct convert_to_argb2101010_result argb2101010_result;
> @@ -151,6 +157,10 @@ static struct convert_xrgb8888_case convert_xrgb8888_cases[] = {
>                       .dst_pitch = TEST_USE_DEFAULT_PITCH,
>                       .expected = { 0x00, 0x00, 0xFF },
>               },
> +             .bgr888_result = {
> +                     .dst_pitch = TEST_USE_DEFAULT_PITCH,
> +                     .expected = { 0xFF, 0x00, 0x00 },
> +             },
>               .argb8888_result = {
>                       .dst_pitch = TEST_USE_DEFAULT_PITCH,
>                       .expected = { 0xFFFF0000 },
> @@ -217,6 +227,10 @@ static struct convert_xrgb8888_case convert_xrgb8888_cases[] = {
>                       .dst_pitch = TEST_USE_DEFAULT_PITCH,
>                       .expected = { 0x00, 0x00, 0xFF },
>               },
> +             .bgr888_result = {
> +                     .dst_pitch = TEST_USE_DEFAULT_PITCH,
> +                     .expected = { 0xFF, 0x00, 0x00 },
> +             },
>               .argb8888_result = {
>                       .dst_pitch = TEST_USE_DEFAULT_PITCH,
>                       .expected = { 0xFFFF0000 },
> @@ -330,6 +344,15 @@ static struct convert_xrgb8888_case convert_xrgb8888_cases[] = {
>                               0x00, 0xFF, 0xFF, 0xFF, 0xFF, 0x00,
>                       },
>               },
> +             .bgr888_result = {
> +                     .dst_pitch = TEST_USE_DEFAULT_PITCH,
> +                     .expected = {
> +                             0xFF, 0xFF, 0xFF, 0x00, 0x00, 0x00,
> +                             0xFF, 0x00, 0x00, 0x00, 0xFF, 0x00,
> +                             0x00, 0x00, 0xFF, 0xFF, 0x00, 0xFF,
> +                             0xFF, 0xFF, 0x00, 0x00, 0xFF, 0xFF,
> +                     },
> +             },
>               .argb8888_result = {
>                       .dst_pitch = TEST_USE_DEFAULT_PITCH,
>                       .expected = {
> @@ -468,6 +491,17 @@ static struct convert_xrgb8888_case convert_xrgb8888_cases[] = {
>                               0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
>                       },
>               },
> +             .bgr888_result = {
> +                     .dst_pitch = 15,
> +                     .expected = {
> +                             0x0E, 0x44, 0x9C, 0x11, 0x4D, 0x05, 0xA8, 0xF3, 0x03,
> +                             0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
> +                             0x6C, 0xF0, 0x73, 0x0E, 0x44, 0x9C, 0x11, 0x4D, 0x05,
> +                             0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
> +                             0xA8, 0x03, 0x03, 0x6C, 0xF0, 0x73, 0x0E, 0x44, 0x9C,
> +                             0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
> +                     },
> +             },
>               .argb8888_result = {
>                       .dst_pitch = 20,
>                       .expected = {
> @@ -914,6 +948,52 @@ static void drm_test_fb_xrgb8888_to_rgb888(struct kunit *test)
>       KUNIT_EXPECT_MEMEQ(test, buf, result->expected, dst_size);
>   }
>
> +static void drm_test_fb_xrgb8888_to_bgr888(struct kunit *test)
> +{
> +     const struct convert_xrgb8888_case *params = test->param_value;
> +     const struct convert_to_bgr888_result *result = &params->bgr888_result;
> +     size_t dst_size;
> +     u8 *buf = NULL;
> +     __le32 *xrgb8888 = NULL;
> +     struct iosys_map dst, src;
> +
> +     struct drm_framebuffer fb = {
> +             .format = drm_format_info(DRM_FORMAT_XRGB8888),
> +             .pitches = { params->pitch, 0, 0 },
> +     };
> +
> +     dst_size = conversion_buf_size(DRM_FORMAT_BGR888, result->dst_pitch,
> +                                    &params->clip, 0);
> +     KUNIT_ASSERT_GT(test, dst_size, 0);
> +
> +     buf = kunit_kzalloc(test, dst_size, GFP_KERNEL);
> +     KUNIT_ASSERT_NOT_ERR_OR_NULL(test, buf);
> +     iosys_map_set_vaddr(&dst, buf);
> +
> +     xrgb8888 = cpubuf_to_le32(test, params->xrgb8888, TEST_BUF_SIZE);
> +     KUNIT_ASSERT_NOT_ERR_OR_NULL(test, xrgb8888);
> +     iosys_map_set_vaddr(&src, xrgb8888);
> +
> +     /*
> +      * BGR888 expected results are already in little-endian
> +      * order, so there's no need to convert the test output.
> +      */
> +     drm_fb_xrgb8888_to_bgr888(&dst, &result->dst_pitch, &src, &fb, &params->clip,
> +                               &fmtcnv_state);
> +     KUNIT_EXPECT_MEMEQ(test, buf, result->expected, dst_size);
> +
> +     buf = dst.vaddr; /* restore original value of buf */
> +     memset(buf, 0, dst_size);
> +
> +     int blit_result = 0;
> +
> +     blit_result = drm_fb_blit(&dst, &result->dst_pitch, DRM_FORMAT_BGR888, &src, &fb, &params->clip,
> +                               &fmtcnv_state);
> +
> +     KUNIT_EXPECT_FALSE(test, blit_result);
> +     KUNIT_EXPECT_MEMEQ(test, buf, result->expected, dst_size);
> +}
> +
>   static void drm_test_fb_xrgb8888_to_argb8888(struct kunit *test)
>   {
>       const struct convert_xrgb8888_case *params = test->param_value;
> @@ -1851,6 +1931,7 @@ static struct kunit_case drm_format_helper_test_cases[] = {
>       KUNIT_CASE_PARAM(drm_test_fb_xrgb8888_to_argb1555, convert_xrgb8888_gen_params),
>       KUNIT_CASE_PARAM(drm_test_fb_xrgb8888_to_rgba5551, convert_xrgb8888_gen_params),
>       KUNIT_CASE_PARAM(drm_test_fb_xrgb8888_to_rgb888, convert_xrgb8888_gen_params),
> +     KUNIT_CASE_PARAM(drm_test_fb_xrgb8888_to_bgr888, convert_xrgb8888_gen_params),
>       KUNIT_CASE_PARAM(drm_test_fb_xrgb8888_to_argb8888, convert_xrgb8888_gen_params),
>       KUNIT_CASE_PARAM(drm_test_fb_xrgb8888_to_xrgb2101010, convert_xrgb8888_gen_params),
>       KUNIT_CASE_PARAM(drm_test_fb_xrgb8888_to_argb2101010, convert_xrgb8888_gen_params),
> diff --git a/include/drm/drm_format_helper.h b/include/drm/drm_format_helper.h
> index f13b34e0b..b53cf85ca 100644
> --- a/include/drm/drm_format_helper.h
> +++ b/include/drm/drm_format_helper.h
> @@ -95,6 +95,9 @@ void drm_fb_xrgb8888_to_rgba5551(struct iosys_map *dst, const unsigned int *dst_
>   void drm_fb_xrgb8888_to_rgb888(struct iosys_map *dst, const unsigned int *dst_pitch,
>                              const struct iosys_map *src, const struct drm_framebuffer *fb,
>                              const struct drm_rect *clip, struct drm_format_conv_state *state);
> +void drm_fb_xrgb8888_to_bgr888(struct iosys_map *dst, const unsigned int *dst_pitch,
> +                            const struct iosys_map *src, const struct drm_framebuffer *fb,
> +                            const struct drm_rect *clip, struct drm_format_conv_state *state);
>   void drm_fb_xrgb8888_to_argb8888(struct iosys_map *dst, const unsigned int *dst_pitch,
>                                const struct iosys_map *src, const struct drm_framebuffer *fb,
>                                const struct drm_rect *clip, struct drm_format_conv_state *state);

--
--
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Frankenstrasse 146, 90461 Nuernberg, Germany
GF: Ivo Totev, Andrew Myers, Andrew McDonald, Boudien Moerman
HRB 36809 (AG Nuernberg)





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