[PATCH v4 3/3] drm/format-helper: Add KUnit tests for drm_fb_xrgb8888_to_gray8()

[Maxime Ripard]

Hi,

On Mon, Sep 19, 2022 at 09:15:31AM +0200, José Expósito wrote:
> Extend the existing test cases to test the conversion from XRGB8888 to
> grayscale.
> 
> Tested-by: Maíra Canal <mairacanal at riseup.net>
> Reviewed-by: David Gow <davidgow at google.com>
> Signed-off-by: José Expósito <jose.exposito89 at gmail.com>
> ---
>  .../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 09d358b54da0..71722e828abe 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 drm_test_fb_xrgb8888_to_xrgb2101010_test(struct kunit *test)
>  	KUNIT_EXPECT_EQ(test, memcmp(buf, result->expected, dst_size), 0);
>  }
>  
> +static void drm_test_fb_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(drm_test_fb_xrgb8888_to_rgb332, convert_xrgb8888_gen_params),
>  	KUNIT_CASE_PARAM(drm_test_fb_xrgb8888_to_rgb565, convert_xrgb8888_gen_params),
>  	KUNIT_CASE_PARAM(drm_test_fb_xrgb8888_to_rgb888_test, convert_xrgb8888_gen_params),
>  	KUNIT_CASE_PARAM(drm_test_fb_xrgb8888_to_xrgb2101010_test, convert_xrgb8888_gen_params),
> +	KUNIT_CASE_PARAM(drm_test_fb_xrgb8888_to_gray8_test, convert_xrgb8888_gen_params),

The trailing test feels redundant, and we should order them
alphabetically to avoid conflicts as much as possible.

Feel free to add my
Acked-by: Maxime Ripard <maxime at cerno.tech>

And fix this while applying

Maxime