[PATCH 3/7] test: Use cmp to catch byte-by-byte identical files

cmp runs faster than perceptualdiff, and catches files that are exact
copies of the reference image.  We still use perceptualdiff for catching
files that aren't bytewise identical, but are still identical at the
pixel level.

Signed-off-by: Bryce Harrington <[email protected]>
---
 test/check_refs.sh |   20 ++++++++++++--------
 1 file changed, 12 insertions(+), 8 deletions(-)

diff --git a/test/check_refs.sh b/test/check_refs.sh
index 649d509..7527523 100755
--- a/test/check_refs.sh
+++ b/test/check_refs.sh
@@ -47,14 +47,18 @@ for file in *.ref.png; do
     fi
 
     if [ -e $ref ]; then
-        # Run perceptualdiff with minimum threshold
-        pdiff_output=$($pdiff $ref $file -threshold 1)
-        result=${pdiff_output%:*}
-        notes=$(echo "${pdiff_output#*: }" | tail -n 1)
-        if [ "$result" = "PASS" ] && [ "$notes" = "Images are binary identical" ]; then
-	    printf "redundant: %s is binary identical to %s\n" $file $ref
-            notes=""
-        fi
+	if cmp --silent "$ref" "$file" ; then
+	    printf "redundant: %s and %s are byte-by-byte identical files\n" $file $ref
+	else
+            # Run perceptualdiff with minimum threshold
+            pdiff_output=$($pdiff $ref $file -threshold 1)
+            result=${pdiff_output%:*}
+            notes=$(echo "${pdiff_output#*: }" | tail -n 1)
+            if [ "$result" = "PASS" ] && [ "$notes" = "Images are binary identical" ]; then
+		printf "redundant: %s and %s are binary identical images\n" $file $ref
+		notes=""
+            fi
+	fi
     fi
 
 done
-- 
1.7.9.5


--
Bryce Harrington
Senior Open Source Developer  -  [email protected]
Open Source Group             -  Samsung Research America

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