[PATCH] drm/format_helper: Add Kunit tests for drm_fb_xrgb8888_to_mono()

[Arthur Grillo Queiroz Cabral]

On 02/03/23 17:01, Arthur Grillo wrote:
> Extend the existing test cases to test the conversion from XRGB8888 to
> monochromatic.
> 
> Signed-off-by: Arthur Grillo <arthurgrillo at riseup.net>
> ---
>  .../gpu/drm/tests/drm_format_helper_test.c    | 73 +++++++++++++++++++
>  1 file changed, 73 insertions(+)
> 
> diff --git a/drivers/gpu/drm/tests/drm_format_helper_test.c b/drivers/gpu/drm/tests/drm_format_helper_test.c
> index 9536829c6e3a..0610341e7349 100644
> --- a/drivers/gpu/drm/tests/drm_format_helper_test.c
> +++ b/drivers/gpu/drm/tests/drm_format_helper_test.c
> @@ -67,6 +67,11 @@ struct convert_to_argb2101010_result {
>  	const u32 expected[TEST_BUF_SIZE];
>  };
>  
> +struct convert_to_mono_result {
> +	unsigned int dst_pitch;
> +	const u8 expected[TEST_BUF_SIZE];
> +};
> +
>  struct convert_xrgb8888_case {
>  	const char *name;
>  	unsigned int pitch;
> @@ -82,6 +87,7 @@ struct convert_xrgb8888_case {
>  	struct convert_to_argb8888_result argb8888_result;
>  	struct convert_to_xrgb2101010_result xrgb2101010_result;
>  	struct convert_to_argb2101010_result argb2101010_result;
> +	struct convert_to_mono_result mono_result;
>  };
>  
>  static struct convert_xrgb8888_case convert_xrgb8888_cases[] = {
> @@ -131,6 +137,10 @@ static struct convert_xrgb8888_case convert_xrgb8888_cases[] = {
>  			.dst_pitch = 0,
>  			.expected = { 0xFFF00000 },
>  		},
> +		.mono_result = {
> +			.dst_pitch = 0,
> +			.expected = { 0x00 },
> +		},
>  	},
>  	{
>  		.name = "single_pixel_clip_rectangle",
> @@ -181,6 +191,10 @@ static struct convert_xrgb8888_case convert_xrgb8888_cases[] = {
>  			.dst_pitch = 0,
>  			.expected = { 0xFFF00000 },
>  		},
> +		.mono_result = {
> +			.dst_pitch = 0,
> +			.expected = { 0x00 },
> +		},
>  	},
>  	{
>  		/* Well known colors: White, black, red, green, blue, magenta,
> @@ -293,6 +307,15 @@ static struct convert_xrgb8888_case convert_xrgb8888_cases[] = {
>  				0xFFFFFC00, 0xC00FFFFF,
>  			},
>  		},
> +		.mono_result = {
> +			.dst_pitch = 0,
> +			.expected = {
> +				0x01,
> +				0x02,
> +				0x00,
> +				0x03,
> +			},
> +		},
>  	},
>  	{
>  		/* Randomly picked colors. Full buffer within the clip area. */
> @@ -392,6 +415,14 @@ static struct convert_xrgb8888_case convert_xrgb8888_cases[] = {
>  				0xEA20300C, 0xDB1705CD, 0xC3844672, 0x00000000, 0x00000000,
>  			},
>  		},
> +		.mono_result = {
> +			.dst_pitch = 0,
> +			.expected = {
> +				0x00,
> +				0x00,
> +				0x00,
> +			},
> +		},
Now I notice that this test is not so useful for this conversion.
Maybe I will change the colors of the test to stop the expected
array from being just zeros on the v2.
>  	},
>  };
>  
> @@ -419,6 +450,17 @@ static size_t conversion_buf_size(u32 dst_format, unsigned int dst_pitch,
>  	return dst_pitch * drm_rect_height(clip);
>  }
>  
> +static size_t conversion_buf_size_mono(unsigned int dst_pitch, const struct drm_rect *clip)
> +{
> +	if (!dst_pitch) {
> +		unsigned int linepixels = drm_rect_width(clip) * 1;
> +
> +		dst_pitch = DIV_ROUND_UP(linepixels, 8);
> +	}
> +
> +	return dst_pitch * drm_rect_height(clip);
> +}
> +
>  static u16 *le16buf_to_cpu(struct kunit *test, const __le16 *buf, size_t buf_size)
>  {
>  	u16 *dst = NULL;
> @@ -789,6 +831,36 @@ static void drm_test_fb_xrgb8888_to_argb2101010(struct kunit *test)
>  	KUNIT_EXPECT_MEMEQ(test, buf, result->expected, dst_size);
>  }
>  
> +static void drm_test_fb_xrgb8888_to_mono(struct kunit *test)
> +{
> +	const struct convert_xrgb8888_case *params = test->param_value;
> +	const struct convert_to_mono_result *result = &params->mono_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_mono(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 = cpubuf_to_le32(test, params->xrgb8888, TEST_BUF_SIZE);
> +	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, xrgb8888);
> +	iosys_map_set_vaddr(&src, xrgb8888);
> +
> +	drm_fb_xrgb8888_to_mono(&dst, &result->dst_pitch, &src, &fb, &params->clip);
> +	KUNIT_EXPECT_MEMEQ(test, buf, result->expected, dst_size);
> +}
> +
>  static struct kunit_case drm_format_helper_test_cases[] = {
>  	KUNIT_CASE_PARAM(drm_test_fb_xrgb8888_to_gray8, convert_xrgb8888_gen_params),
>  	KUNIT_CASE_PARAM(drm_test_fb_xrgb8888_to_rgb332, convert_xrgb8888_gen_params),
> @@ -800,6 +872,7 @@ static struct kunit_case drm_format_helper_test_cases[] = {
>  	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),
> +	KUNIT_CASE_PARAM(drm_test_fb_xrgb8888_to_mono, convert_xrgb8888_gen_params),
>  	{}
>  };
>