[PATCH 3/3] drm/format-helper: Add KUnit tests for drm_fb_xrgb8888_to_gray8()

[David Gow]

On Tue, Aug 16, 2022 at 6:29 PM José Expósito <jose.exposito89 at gmail.com> wrote:
>
> Extend the existing test cases to test the conversion from XRGB8888 to
> grayscale.
>
> Signed-off-by: José Expósito <jose.exposito89 at gmail.com>
> ---

This looks good to me as well. The grey8 conversion is a bit trickier
to eyeball due to ITU BT.601 giving the components different weights,
but it seems sensible and passes here.

Again, KUNIT_EXPECT_MEMEQ() will be nice one day, but shouldn't hold this up.

Reviewed-by: David Gow <davidgow at google.com>

Cheers,
-- David

>  .../gpu/drm/tests/drm_format_helper_test.c    | 62 +++++++++++++++++++
>  1 file changed, 62 insertions(+)
>
> diff --git a/drivers/gpu/drm/tests/drm_format_helper_test.c b/drivers/gpu/drm/tests/drm_format_helper_test.c
> index d8536db4de1e..2f548aa51a30 100644
> --- a/drivers/gpu/drm/tests/drm_format_helper_test.c
> +++ b/drivers/gpu/drm/tests/drm_format_helper_test.c
> @@ -37,6 +37,11 @@ struct convert_to_xrgb2101010_result {
>         const u32 expected[TEST_BUF_SIZE];
>  };
>
> +struct convert_to_gray8_result {
> +       unsigned int dst_pitch;
> +       const u8 expected[TEST_BUF_SIZE];
> +};
> +
>  struct convert_xrgb8888_case {
>         const char *name;
>         unsigned int pitch;
> @@ -46,6 +51,7 @@ struct convert_xrgb8888_case {
>         struct convert_to_rgb565_result rgb565_result;
>         struct convert_to_rgb888_result rgb888_result;
>         struct convert_to_xrgb2101010_result xrgb2101010_result;
> +       struct convert_to_gray8_result gray8_result;
>  };
>
>  static struct convert_xrgb8888_case convert_xrgb8888_cases[] = {
> @@ -71,6 +77,10 @@ static struct convert_xrgb8888_case convert_xrgb8888_cases[] = {
>                         .dst_pitch = 0,
>                         .expected = { 0x3FF00000 },
>                 },
> +               .gray8_result = {
> +                       .dst_pitch = 0,
> +                       .expected = { 0x4C },
> +               },
>         },
>         {
>                 .name = "single_pixel_clip_rectangle",
> @@ -97,6 +107,10 @@ static struct convert_xrgb8888_case convert_xrgb8888_cases[] = {
>                         .dst_pitch = 0,
>                         .expected = { 0x3FF00000 },
>                 },
> +               .gray8_result = {
> +                       .dst_pitch = 0,
> +                       .expected = { 0x4C },
> +               },
>         },
>         {
>                 /* Well known colors: White, black, red, green, blue, magenta,
> @@ -155,6 +169,15 @@ static struct convert_xrgb8888_case convert_xrgb8888_cases[] = {
>                                 0x3FFFFC00, 0x000FFFFF,
>                         },
>                 },
> +               .gray8_result = {
> +                       .dst_pitch = 0,
> +                       .expected = {
> +                               0xFF, 0x00,
> +                               0x4C, 0x99,
> +                               0x19, 0x66,
> +                               0xE5, 0xB2,
> +                       },
> +               },
>         },
>         {
>                 /* Randomly picked colors. Full buffer within the clip area. */
> @@ -206,6 +229,14 @@ static struct convert_xrgb8888_case convert_xrgb8888_cases[] = {
>                                 0x2A20300C, 0x1B1705CD, 0x03844672, 0x00000000, 0x00000000,
>                         },
>                 },
> +               .gray8_result = {
> +                       .dst_pitch = 5,
> +                       .expected = {
> +                               0x3C, 0x33, 0x34, 0x00, 0x00,
> +                               0x6F, 0x3C, 0x33, 0x00, 0x00,
> +                               0x34, 0x6F, 0x3C, 0x00, 0x00,
> +                       },
> +               },
>         },
>  };
>
> @@ -381,11 +412,42 @@ static void xrgb8888_to_xrgb2101010_test(struct kunit *test)
>         KUNIT_EXPECT_EQ(test, memcmp(buf, result->expected, dst_size), 0);
>  }
>
> +static void xrgb8888_to_gray8_test(struct kunit *test)
> +{
> +       const struct convert_xrgb8888_case *params = test->param_value;
> +       const struct convert_to_gray8_result *result = &params->gray8_result;
> +       size_t dst_size;
> +       __u8 *buf = NULL;
> +       __u32 *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_R8, result->dst_pitch,
> +                                      &params->clip);
> +       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 = le32buf_to_cpu(test, params->xrgb8888, TEST_BUF_SIZE);
> +       KUNIT_ASSERT_NOT_ERR_OR_NULL(test, xrgb8888);
> +       iosys_map_set_vaddr(&src, xrgb8888);
> +
> +       drm_fb_xrgb8888_to_gray8(&dst, &result->dst_pitch, &src, &fb, &params->clip);
> +       KUNIT_EXPECT_EQ(test, memcmp(buf, result->expected, dst_size), 0);
> +}
> +
>  static struct kunit_case drm_format_helper_test_cases[] = {
>         KUNIT_CASE_PARAM(xrgb8888_to_rgb332_test, convert_xrgb8888_gen_params),
>         KUNIT_CASE_PARAM(xrgb8888_to_rgb565_test, convert_xrgb8888_gen_params),
>         KUNIT_CASE_PARAM(xrgb8888_to_rgb888_test, convert_xrgb8888_gen_params),
>         KUNIT_CASE_PARAM(xrgb8888_to_xrgb2101010_test, convert_xrgb8888_gen_params),
> +       KUNIT_CASE_PARAM(xrgb8888_to_gray8_test, convert_xrgb8888_gen_params),
>         {}
>  };
>
> --
> 2.25.1
>
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