[igt-dev] [PATCH v7 11/14] chamelium: Change our pattern for a custom one if needed

[Maxime Ripard]

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.

Let's create a function that will generate that pattern in the chamelium
code if we need to convert the framebuffer to a smaller depth, and use the
current pattern otherwise.

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 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 (this has been
tested on a Raspberry Pi's VC4) 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 at bootlin.com>
---
 tests/kms_chamelium.c | 59 +++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 53 insertions(+), 6 deletions(-)

diff --git a/tests/kms_chamelium.c b/tests/kms_chamelium.c
index 1e3a6fdaa44d..8d2b3f8e170d 100644
--- a/tests/kms_chamelium.c
+++ b/tests/kms_chamelium.c
@@ -486,6 +486,42 @@ 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);
+
+	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,
 				igt_output_t *output, drmModeModeInfo *mode,
 				int count)
@@ -496,12 +532,23 @@ static void do_test_display_crc(data_t *data, struct chamelium_port *port,
 	struct igt_fb fb;
 	int i, fb_id, captured_frame_count;
 
-	fb_id = igt_create_color_pattern_fb(data->drm_fd,
-					    mode->hdisplay,
-					    mode->vdisplay,
-					    DRM_FORMAT_XRGB8888,
-					    LOCAL_DRM_FORMAT_MOD_NONE,
-					    0, 0, 0, &fb);
+	/*
+	 * We only need to create a custom pattern if we want to
+	 * display a format that is either XRGB8888, or has the same
+	 * depth since we won't have any downsampling.
+	 */
+	if (igt_drm_format_to_depth(DRM_FORMAT_XRGB8888) ==
+	    igt_drm_format_to_depth(fourcc))
+		fb_id = igt_create_color_pattern_fb(data->drm_fd,
+						    mode->hdisplay,
+						    mode->vdisplay,
+						    DRM_FORMAT_XRGB8888,
+						    LOCAL_DRM_FORMAT_MOD_NONE,
+						    0, 0, 0, &fb);
+	else
+		fb_id = chamelium_get_pattern_fb(data, mode,
+						 DRM_FORMAT_XRGB8888, &fb);
+
 	igt_assert(fb_id > 0);
 
 	fb_crc = chamelium_calculate_fb_crc_async_start(data->drm_fd,
-- 
git-series 0.9.1