Re: [Pixman] [PATCH 1/2] Add new test of filter reduction from BILINEAR to NEAREST

[Bill Spitzak]

Great idea to test this.

On Mon, Mar 14, 2016 at 11:24 PM, Søren Sandmann 
wrote:

> diff --git a/test/filter-reduction-test.c b/test/filter-reduction-test.c
>
>> new file mode 100644
>> index 000..72b3142
>> --- /dev/null
>> +++ b/test/filter-reduction-test.c
>> @@ -0,0 +1,119 @@
>> +/*
>> + * Test program, which can detect some problems with nearest neighbour
>> + * and bilinear scaling in pixman. Testing is done by running lots
>> + * of random SRC and OVER compositing operations a8r8g8b8, x8a8r8g8b8
>> + * and r5g6b5 color formats.
>> + *
>> + * Script 'fuzzer-find-diff.pl' can be used to narrow down the problem
>> in
>> + * the case of test failure.
>> + */
>>
>
> This comment is of course a leftover due to starting from a copy of
> scaling-test.c.
>
>
> Søren
>
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Re: [Pixman] [PATCH 1/2] Add new test of filter reduction from BILINEAR to NEAREST

[Søren Sandmann]

diff --git a/test/filter-reduction-test.c b/test/filter-reduction-test.c

> new file mode 100644
> index 000..72b3142
> --- /dev/null
> +++ b/test/filter-reduction-test.c
> @@ -0,0 +1,119 @@
> +/*
> + * Test program, which can detect some problems with nearest neighbour
> + * and bilinear scaling in pixman. Testing is done by running lots
> + * of random SRC and OVER compositing operations a8r8g8b8, x8a8r8g8b8
> + * and r5g6b5 color formats.
> + *
> + * Script 'fuzzer-find-diff.pl' can be used to narrow down the problem in
> + * the case of test failure.
> + */
>

This comment is of course a leftover due to starting from a copy of
scaling-test.c.


Søren
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[Pixman] [PATCH 1/2] Add new test of filter reduction from BILINEAR to NEAREST

[Søren Sandmann Pedersen]

This new test tests a bunch of bilinear downscalings, where many have
a transformation such that the BILINEAR filter can be reduced to
NEAREST (and many don't).

A CRC32 is computed for all the resulting images and compared to a
known-good value for both 4-bit and 7-bit interpolation.

Signed-off-by: Søren Sandmann 
---
 test/Makefile.sources|   1 +
 test/filter-reduction-test.c | 119 +++
 2 files changed, 120 insertions(+)
 create mode 100644 test/filter-reduction-test.c

diff --git a/test/Makefile.sources b/test/Makefile.sources
index 5d55e67..0a56231 100644
--- a/test/Makefile.sources
+++ b/test/Makefile.sources
@@ -21,6 +21,7 @@ TESTPROGRAMS =  \
gradient-crash-test   \
pixel-test\
matrix-test   \
+   filter-reduction-test \
composite-traps-test  \
region-contains-test  \
glyph-test\
diff --git a/test/filter-reduction-test.c b/test/filter-reduction-test.c
new file mode 100644
index 000..72b3142
--- /dev/null
+++ b/test/filter-reduction-test.c
@@ -0,0 +1,119 @@
+/*
+ * Test program, which can detect some problems with nearest neighbour
+ * and bilinear scaling in pixman. Testing is done by running lots
+ * of random SRC and OVER compositing operations a8r8g8b8, x8a8r8g8b8
+ * and r5g6b5 color formats.
+ *
+ * Script 'fuzzer-find-diff.pl' can be used to narrow down the problem in
+ * the case of test failure.
+ */
+#include 
+#include 
+#include "utils.h"
+
+static const pixman_fixed_t entries[] =
+{
+pixman_double_to_fixed (-1.0),
+pixman_double_to_fixed (-0.5),
+pixman_double_to_fixed (-1/3.0),
+pixman_double_to_fixed (0.0),
+pixman_double_to_fixed (0.5),
+pixman_double_to_fixed (1.0),
+pixman_double_to_fixed (1.5),
+pixman_double_to_fixed (2.0),
+pixman_double_to_fixed (3.0),
+};
+
+#define SIZE 12
+
+static uint32_t
+test_scale (const pixman_transform_t *xform, uint32_t crc)
+{
+uint32_t *srcbuf, *dstbuf;
+pixman_image_t *src, *dest;
+
+srcbuf = malloc (SIZE * SIZE * 4);
+prng_randmemset (srcbuf, SIZE * SIZE * 4, 0);
+src = pixman_image_create_bits (PIXMAN_a8r8g8b8, SIZE, SIZE, srcbuf, SIZE 
* 4);
+
+dstbuf = malloc (SIZE * SIZE * 4);
+prng_randmemset (dstbuf, SIZE * SIZE * 4, 0);
+dest = pixman_image_create_bits (PIXMAN_a8r8g8b8, SIZE, SIZE, dstbuf, SIZE 
* 4);
+
+pixman_image_set_transform (src, xform);
+pixman_image_set_repeat (src, PIXMAN_REPEAT_NORMAL);
+pixman_image_set_filter (src, PIXMAN_FILTER_BILINEAR, NULL, 0);
+
+image_endian_swap (src);
+image_endian_swap (dest);
+
+pixman_image_composite (PIXMAN_OP_SRC,
+   src, NULL, dest,
+   0, 0, 0, 0, 0, 0,
+   SIZE, SIZE);
+
+crc = compute_crc32_for_image (crc, dest);
+
+pixman_image_unref (src);
+pixman_image_unref (dest);
+
+free (srcbuf);
+free (dstbuf);
+
+return crc;
+}
+
+#if BILINEAR_INTERPOLATION_BITS == 7
+#define CHECKSUM 0x40BDEAC4
+#elif BILINEAR_INTERPOLATION_BITS == 4
+#define CHECKSUM 0xF8245E72
+#else
+#define CHECKSUM 0x
+#endif
+
+int
+main (int argc, const char *argv[])
+{
+const pixman_fixed_t *end = entries + ARRAY_LENGTH (entries);
+const pixman_fixed_t *t0, *t1, *t2, *t3, *t4, *t5;
+uint32_t crc = 0;
+
+prng_srand (0xcafebabe);
+
+for (t0 = entries; t0 < end; ++t0)
+{
+   for (t1 = entries; t1 < end; ++t1)
+   {
+   for (t2 = entries; t2 < end; ++t2)
+   {
+   for (t3 = entries; t3 < end; ++t3)
+   {
+   for (t4 = entries; t4 < end; ++t4)
+   {
+   for (t5 = entries; t5 < end; ++t5)
+   {
+   pixman_transform_t xform = {
+   { { *t0, *t1, *t2 },
+ { *t3, *t4, *t5 },
+ { 0, 0, pixman_fixed_1 } }
+   };
+
+   crc = test_scale (, crc);
+   }
+   }
+   }
+   }
+   }
+}
+
+if (crc != CHECKSUM)
+{
+   printf ("filter-reduction-test failed! (checksum=%08X, expected 
%08X)\n", crc, CHECKSUM);
+   return 1;
+}
+else
+{
+   printf ("filter-reduction-test passed (checksum=%08X)\n", crc);
+   return 0;
+}
+}
-- 
1.7.11.7

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