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Add tests for primaries

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Add tests that check that our built-in matrices match the ones we
get by doing the math from the corresponding primaries.
This commit is contained in:
Matthias Clasen 2024-08-14 16:23:37 -04:00
parent d9f6d9efb9
commit b073698796
1 changed files with 60 additions and 0 deletions
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60
testsuite/gdk/colorstate-internal.c
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@ -105,6 +105,20 @@ static MatrixTest matrices[] = {
{ "srgb<>rec2020", rec2020_to_srgb, srgb_to_rec2020 },
};
typedef struct
{
const char *name;
const GdkPrimaries *primaries;
const float *to_xyz;
} PrimaryTest;
static PrimaryTest primary_tests[] = {
{ "srgb", &srgb_primaries, srgb_to_xyz },
{ "pal", &pal_primaries, pal_to_xyz },
{ "ntsc", &ntsc_primaries, ntsc_to_xyz },
{ "rec2020", &rec2020_primaries, rec2020_to_xyz },
{ "p3", &p3_primaries, p3_to_xyz },
};
#define IDX(i,j) 3*i+j
static inline void
multiply (float res[9],
@ -167,6 +181,44 @@ test_matrix (gconstpointer data)
g_assert_cmpfloat_with_epsilon (norm (res2), 0, 0.001);
}
static void
compute_to_xyz_from_primaries (const float primaries[8],
float to_xyz[9])
{
float rx, ry, gx, gy, bx, by, wx, wy;
float rY, bY, gY;
rx = primaries[0]; ry = primaries[1];
gx = primaries[2]; gy = primaries[3];
bx = primaries[4]; by = primaries[5];
wx = primaries[6]; wy = primaries[7];
bY = (((1 - wx)/wy - (1 - rx)/ry)*(gx/gy - rx/ry) - (wx/wy - rx/ry)*((1 - gx)/gy - (1 - rx)/ry)) /
(((1 - bx)/by - (1 - rx)/ry)*(gx/gy - rx/ry) - (bx/by - rx/ry)*((1 - gx)/gy - (1 - rx)/ry));
gY = (wx/wy - rx/ry - bY*(bx/by - rx/ry)) / (gx/gy - rx/ry);
rY = 1 - gY - bY;
to_xyz[0] = rY/ry * rx; to_xyz[1] = gY/gy * gx; to_xyz[2] = bY/by * bx;
to_xyz[3] = rY; to_xyz[4] = gY; to_xyz[5] = bY;
to_xyz[6] = rY/ry * (1-rx-ry); to_xyz[7] = gY/gy * (1-gx-gy); to_xyz[8] = bY/by * (1-bx-by);
}
static void
test_primaries (gconstpointer data)
{
float res[9], res2[9];
PrimaryTest *test = (PrimaryTest *) data;
compute_to_xyz_from_primaries (test->primaries->values, res);
difference (res2, res, test->to_xyz);
g_assert_cmpfloat_with_epsilon (norm (res2), 0, 0.00001);
}
static void
test_srgb_to_rec2020 (void)
{
@ -241,6 +293,14 @@ main (int argc, char *argv[])
g_free (path);
}
for (guint i = 0; i < G_N_ELEMENTS (primary_tests); i++)
{
PrimaryTest *test = &primary_tests[i];
char *path = g_strdup_printf ("/colorstate/primaries/%s", test->name);
g_test_add_data_func (path, test, test_primaries);
g_free (path);
}
g_test_add_func ("/colorstate/matrix/srgb_to_rec2020", test_srgb_to_rec2020);
g_test_add_func ("/colorstate/matrix/rec2020_to_srgb", test_rec2020_to_srgb);
g_test_add_func ("/color/mislabel", test_color_mislabel);