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[test] bufferdiff: take abs of the pixel diffs. Oops!

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This commit is contained in:
Behdad Esfahbod 2006-08-22 22:00:58 -04:00
parent 988b5dcb7e
commit 96c8f92883
1 changed files with 2 additions and 1 deletions
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3
test/buffer-diff.c
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@ -28,6 +28,7 @@
#endif
#include <stdio.h>
#include <stdlib.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
@ -93,7 +94,7 @@ buffer_diff_core (unsigned char *_buf_a,
unsigned char value_a = (row_a[x] >> (channel*8));
unsigned char value_b = (row_b[x] >> (channel*8));
unsigned int diff;
diff = value_a - value_b;
diff = abs (value_a - value_b);
diff *= 4; /* emphasize */
if (diff > 255)
diff = 255;