From: Siarhei Siamashka <siarhei.siamas...@nokia.com>
The upcoming optimization which is going to be able to replace BILINEAR filter
with NEAREST where appropriate needs to analyze the transformation matrix
and not to make any mistakes.
The changes to affine-test include:
1. Higher chance of using the same scale factor for x and y axes. This can help
to stress some special cases (for example the case when both x and y scale
factors are integer). The same applies to x/y translation.
2. Introduced a small chance for "corrupting" transformation matrix by flipping
random bits. This supposedly can help to identify the cases when some of the
fast paths or other code logic is wrongly activated due to insufficient
checks.
---
test/affine-test.c | 36 ++++++++++++++++++++++++++++++------
1 files changed, 30 insertions(+), 6 deletions(-)
diff --git a/test/affine-test.c b/test/affine-test.c
index ed8000c..ddeca56 100644
--- a/test/affine-test.c
+++ b/test/affine-test.c
@@ -100,13 +100,22 @@ test_composite (int testnum,
pixman_transform_init_identity (&transform);
- if (lcg_rand_n (8) > 0)
+ if (lcg_rand_n (3) > 0)
{
- scale_x = -32768 * 3 + lcg_rand_N (65536 * 5);
- scale_y = -32768 * 3 + lcg_rand_N (65536 * 5);
- translate_x = lcg_rand_N (65536);
- translate_y = lcg_rand_N (65536);
+ scale_x = -65536 * 3 + lcg_rand_N (65536 * 6);
+ if (lcg_rand_n (2))
+ scale_y = -65536 * 3 + lcg_rand_N (65536 * 6);
+ else
+ scale_y = scale_x;
pixman_transform_init_scale (&transform, scale_x, scale_y);
+ }
+ if (lcg_rand_n (3) > 0)
+ {
+ translate_x = -65536 * 3 + lcg_rand_N (6 * 65536);
+ if (lcg_rand_n (2))
+ translate_y = -65536 * 3 + lcg_rand_N (6 * 65536);
+ else
+ translate_y = translate_x;
pixman_transform_translate (&transform, NULL, translate_x, translate_y);
}
@@ -144,6 +153,21 @@ test_composite (int testnum,
pixman_transform_translate (&transform, NULL, tx, ty);
}
+ if (lcg_rand_n (8) == 0)
+ {
+ /* Flip random bits */
+ int maxflipcount = 8;
+ while (maxflipcount--)
+ {
+ int i = lcg_rand_n (2);
+ int j = lcg_rand_n (3);
+ int bitnum = lcg_rand_n (32);
+ transform.matrix[i][j] ^= 1 << bitnum;
+ if (lcg_rand_n (2))
+ break;
+ }
+ }
+
pixman_image_set_transform (src_img, &transform);
switch (lcg_rand_n (4))
@@ -282,6 +306,6 @@ main (int argc, const char *argv[])
{
pixman_disable_out_of_bounds_workaround ();
- return fuzzer_test_main ("affine", 8000000, 0x4B5D1852,
+ return fuzzer_test_main ("affine", 8000000, 0x02A33034,
test_composite, argc, argv);
}
--
1.6.0.6
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