[Pixman] [PATCH] test: Fix stride calculation in stress-test

[Siarhei Siamashka]

Currently the number of bits per pixel is used instead of the
number of bytes per pixel when calculating image strides. This
does not cause any real problems, but the gaps between scanlines
are excessively large.

This patch actually converts bits to bytes and rounds up the result
to the nearest byte boundary.

Signed-off-by: Siarhei Siamashka <siarhei.siamashka at gmail.com>
---
 test/stress-test.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/test/stress-test.c b/test/stress-test.c
index 1f03c75..85d1293 100644
--- a/test/stress-test.c
+++ b/test/stress-test.c
@@ -291,7 +291,7 @@ create_random_bits_image (alpha_preference_t alpha_preference)
     {
     default:
     case 0:
-	stride = width * PIXMAN_FORMAT_BPP (format) + prng_rand_n (17);
+	stride = (width * PIXMAN_FORMAT_BPP (format) + 7) / 8 + prng_rand_n (17);
 	stride = (stride + 3) & (~3);
 	bits = (uint32_t *)make_random_bytes (height * stride);
 	break;
@@ -302,7 +302,7 @@ create_random_bits_image (alpha_preference_t alpha_preference)
 	break;
 
     case 2: /* Zero-filled */
-	stride = width * PIXMAN_FORMAT_BPP (format) + prng_rand_n (17);
+	stride = (width * PIXMAN_FORMAT_BPP (format) + 7) / 8 + prng_rand_n (17);
 	stride = (stride + 3) & (~3);
 	bits = fence_malloc (height * stride);
 	if (!bits)
@@ -311,7 +311,7 @@ create_random_bits_image (alpha_preference_t alpha_preference)
 	break;
 
     case 3: /* Filled with 0xFF */
-	stride = width * PIXMAN_FORMAT_BPP (format) + prng_rand_n (17);
+	stride = (width * PIXMAN_FORMAT_BPP (format) + 7) / 8 + prng_rand_n (17);
 	stride = (stride + 3) & (~3);
 	bits = fence_malloc (height * stride);
 	if (!bits)
@@ -327,7 +327,7 @@ create_random_bits_image (alpha_preference_t alpha_preference)
 	break;
 
     case 5: /* bits is a real pointer, has read/write functions */
-	stride = width * PIXMAN_FORMAT_BPP (format) + prng_rand_n (17);
+	stride = (width * PIXMAN_FORMAT_BPP (format) + 7) / 8 + prng_rand_n (17);
 	stride = (stride + 3) & (~3);
 	bits = fence_malloc (height * stride);
 	if (!bits)
@@ -338,7 +338,7 @@ create_random_bits_image (alpha_preference_t alpha_preference)
 	break;
 
     case 6: /* bits is a real pointer, stride is negative */
-	stride = (width * PIXMAN_FORMAT_BPP (format) + prng_rand_n (17));
+	stride = (width * PIXMAN_FORMAT_BPP (format) + 7) / 8 + prng_rand_n (17);
 	stride = (stride + 3) & (~3);
 	bits = (uint32_t *)make_random_bytes (height * stride);
 	if (!bits)
-- 
2.16.1