[PATCH v2 4/4] drm/format-helper: Add KUnit tests for drm_fb_xrgb8888_to_rgb565()

[David Gow]

On Sat, Jul 9, 2022 at 7:58 PM José Expósito <jose.exposito89 at gmail.com> wrote:
>
> Extend the existing test cases to test the conversion from XRGB8888 to
> RGB565.
>
> The documentation and the color picker available on [1] are useful
> resources to understand this patch and validate the values returned by
> the conversion function.
>
> Tested-by: Tales L. Aparecida <tales.aparecida at gmail.com>
> Acked-by: Thomas Zimmermann <tzimmermann at suse.de>
> Signed-off-by: José Expósito <jose.exposito89 at gmail.com>
> Link: http://www.barth-dev.de/online/rgb565-color-picker/ # [1]
> ---

Looks good and passes here.

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

Thanks,
-- David


>  .../gpu/drm/tests/drm_format_helper_test.c    | 76 ++++++++++++++++++-
>  1 file changed, 75 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/tests/drm_format_helper_test.c b/drivers/gpu/drm/tests/drm_format_helper_test.c
> index 0a490ad4fd32..c0592c1235cf 100644
> --- a/drivers/gpu/drm/tests/drm_format_helper_test.c
> +++ b/drivers/gpu/drm/tests/drm_format_helper_test.c
> @@ -21,12 +21,19 @@ struct convert_to_rgb332_result {
>         const u8 expected[TEST_BUF_SIZE];
>  };
>
> +struct convert_to_rgb565_result {
> +       unsigned int dst_pitch;
> +       const u16 expected[TEST_BUF_SIZE];
> +       const u16 expected_swab[TEST_BUF_SIZE];
> +};
> +
>  struct convert_xrgb8888_case {
>         const char *name;
>         unsigned int pitch;
>         struct drm_rect clip;
>         const u32 xrgb8888[TEST_BUF_SIZE];
>         struct convert_to_rgb332_result rgb332_result;
> +       struct convert_to_rgb565_result rgb565_result;
>  };
>
>  static struct convert_xrgb8888_case convert_xrgb8888_cases[] = {
> @@ -39,6 +46,11 @@ static struct convert_xrgb8888_case convert_xrgb8888_cases[] = {
>                         .dst_pitch = 0,
>                         .expected = { 0xE0 },
>                 },
> +               .rgb565_result = {
> +                       .dst_pitch = 0,
> +                       .expected = { 0xF800 },
> +                       .expected_swab = { 0x00F8 },
> +               },
>         },
>         {
>                 .name = "single_pixel_clip_rectangle",
> @@ -52,6 +64,11 @@ static struct convert_xrgb8888_case convert_xrgb8888_cases[] = {
>                         .dst_pitch = 0,
>                         .expected = { 0xE0 },
>                 },
> +               .rgb565_result = {
> +                       .dst_pitch = 0,
> +                       .expected = { 0xF800 },
> +                       .expected_swab = { 0x00F8 },
> +               },
>         },
>         {
>                 /* Well known colors: White, black, red, green, blue, magenta,
> @@ -77,6 +94,21 @@ static struct convert_xrgb8888_case convert_xrgb8888_cases[] = {
>                                 0xFC, 0x1F,
>                         },
>                 },
> +               .rgb565_result = {
> +                       .dst_pitch = 0,
> +                       .expected = {
> +                               0xFFFF, 0x0000,
> +                               0xF800, 0x07E0,
> +                               0x001F, 0xF81F,
> +                               0xFFE0, 0x07FF,
> +                       },
> +                       .expected_swab = {
> +                               0xFFFF, 0x0000,
> +                               0x00F8, 0xE007,
> +                               0x1F00, 0x1FF8,
> +                               0xE0FF, 0xFF07,
> +                       },
> +               },
>         },
>         {
>                 /* Randomly picked colors. Full buffer within the clip area. */
> @@ -96,6 +128,19 @@ static struct convert_xrgb8888_case convert_xrgb8888_cases[] = {
>                                 0xA0, 0x6D, 0x0A, 0x00, 0x00,
>                         },
>                 },
> +               .rgb565_result = {
> +                       .dst_pitch = 10,
> +                       .expected = {
> +                               0x0A33, 0x1260, 0xA800, 0x0000, 0x0000,
> +                               0x6B8E, 0x0A33, 0x1260, 0x0000, 0x0000,
> +                               0xA800, 0x6B8E, 0x0A33, 0x0000, 0x0000,
> +                       },
> +                       .expected_swab = {
> +                               0x330A, 0x6012, 0x00A8, 0x0000, 0x0000,
> +                               0x8E6B, 0x330A, 0x6012, 0x0000, 0x0000,
> +                               0x00A8, 0x8E6B, 0x330A, 0x0000, 0x0000,
> +                       },
> +               },
>         },
>  };
>
> @@ -120,7 +165,7 @@ static size_t conversion_buf_size(u32 dst_format, unsigned int dst_pitch,
>         if (!dst_pitch)
>                 dst_pitch = drm_rect_width(clip) * dst_fi->cpp[0];
>
> -       return dst_pitch * drm_rect_height(clip);
> +       return (dst_pitch * drm_rect_height(clip)) / (dst_fi->depth / 8);
>  }
>
>  static u32 *le32buf_to_cpu(struct kunit *test, const u32 *buf, size_t buf_size)
> @@ -175,8 +220,37 @@ static void xrgb8888_to_rgb332_test(struct kunit *test)
>         KUNIT_EXPECT_EQ(test, memcmp(dst, result->expected, dst_size), 0);
>  }
>
> +static void xrgb8888_to_rgb565_test(struct kunit *test)
> +{
> +       const struct convert_xrgb8888_case *params = test->param_value;
> +       const struct convert_to_rgb565_result *result = &params->rgb565_result;
> +       size_t dst_size;
> +       __u16 *dst = NULL;
> +
> +       struct drm_framebuffer fb = {
> +               .format = drm_format_info(DRM_FORMAT_XRGB8888),
> +               .pitches = { params->pitch, 0, 0 },
> +       };
> +
> +       dst_size = conversion_buf_size(DRM_FORMAT_RGB565, result->dst_pitch,
> +                                      &params->clip);
> +       KUNIT_ASSERT_GT(test, dst_size, 0);
> +
> +       dst = kunit_kzalloc(test, dst_size, GFP_KERNEL);
> +       KUNIT_ASSERT_NOT_ERR_OR_NULL(test, dst);
> +
> +       drm_fb_xrgb8888_to_rgb565(dst, result->dst_pitch, params->xrgb8888, &fb,
> +                                 &params->clip, false);
> +       KUNIT_EXPECT_EQ(test, memcmp(dst, result->expected, dst_size), 0);
> +
> +       drm_fb_xrgb8888_to_rgb565(dst, result->dst_pitch, params->xrgb8888, &fb,
> +                                 &params->clip, true);
> +       KUNIT_EXPECT_EQ(test, memcmp(dst, result->expected_swab, 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),
>         {}
>  };
>
> --
> 2.25.1
>
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