[igt-dev] [PATCH v4 10/13] chamelium: Change our pattern for a custom one

[Maxime Ripard <maxime.ripard@bootlin.com>]

The current pattern being used is the one generated through the
igt_create_color_pattern_fb.

However, in order to deal with multiple formats and the upsampling /
downsampling issues that might arise from converting back and forth between
formats, we will need to have a pattern with quite precise color values,
and without any shades or gradient of colors.

The easiest way to do that will be to only use values that would have the
same part on the common most significant bits (5, to deal with the most
formats) and have the same bit repeated on the least significant bits that
are going to be dropped and / or padded when converting between formats.

Pixman will fill the lowest bits with 1, and our hardware is able to
support that, so the easiest is to just use all 1's for our components in
order to still be able to compute the CRCs.

Signed-off-by: Maxime Ripard <maxime.ripard@bootlin.com>
---
 tests/kms_chamelium.c | 33 +++++++++++++++++++++++++++++----
 1 file changed, 29 insertions(+), 4 deletions(-)

diff --git a/tests/kms_chamelium.c b/tests/kms_chamelium.c
index f14e3ebb4b87..4f4984b51b41 100644
--- a/tests/kms_chamelium.c
+++ b/tests/kms_chamelium.c
@@ -486,15 +486,40 @@ enable_output(data_t *data,
 	drmModeFreeConnector(connector);
 }
 
+static void chamelium_paint_xr24_pattern(uint32_t *data,
+					 size_t width, size_t height)
+{
+	uint32_t colors[] = { 0xff000000,
+			      0xffff0000,
+			      0xff00ff00,
+			      0xff0000ff,
+			      0xffffffff };
+	unsigned i, j;
+
+	for (i = 0; i < height; i++)
+		for (j = 0; j < width; j++)
+			*(data + i * width + j) = colors[((j / 64) + (i / 64)) % 5];
+}
+
 static int chamelium_get_pattern_fb(data_t *data, drmModeModeInfo *mode,
 				    uint32_t fourcc, struct igt_fb *fb)
 {
+	int fb_id;
+	void *ptr;
+
 	igt_assert(fourcc == DRM_FORMAT_XRGB8888);
 
-	return igt_create_color_pattern_fb(data->drm_fd, mode->hdisplay,
-					   mode->vdisplay, fourcc,
-					   LOCAL_DRM_FORMAT_MOD_NONE,
-					   0, 0, 0, fb);
+	fb_id = igt_create_fb(data->drm_fd, mode->hdisplay, mode->vdisplay,
+			      fourcc, LOCAL_DRM_FORMAT_MOD_NONE, fb);
+	igt_assert(fb_id > 0);
+
+	ptr = igt_fb_map_buffer(fb->fd, fb);
+	igt_assert(ptr);
+
+	chamelium_paint_xr24_pattern(ptr, mode->vdisplay, mode->hdisplay);
+	igt_fb_unmap_buffer(fb, ptr);
+
+	return fb_id;
 }
 
 static void do_test_display_crc(data_t *data, struct chamelium_port *port,
-- 
git-series 0.9.1
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