Implemented rudimentary image compare for OpenCSG regression tests

1 files changed, 31 insertions, 0 deletions

diff --git a/tests/compare-bitmaps.sh b/tests/compare-bitmaps.sh
new file mode 100755
index 0000000..590d0b5
--- /dev/null
+++ b/tests/compare-bitmaps.sh
@@ -0,0 +1,31 @@
+#!/bin/sh
+
+
+while getopts 'v' c
+do
+  case $c in
+    v) set -x ;;
+  esac
+done
+
+shift $(($OPTIND - 1))
+
+# FIXME: Sometimes, compare fails when comparing very small images (e.g. 40 x 10 pixels).
+# It's unknown why this happens..
+pixelerror=`compare -fuzz 10% -metric AE $1 $2 null: 2>&1`
+if [ $? -ne 0 ]; then
+    echo "General error: Ouch"
+    exit 1 # Compare failed to read image
+else
+  # Check if $pixelerror contains an integer (it sometimes outputs things like '0 @ 0,0')
+  if [ $pixelerror -eq $pixelerror 2> /dev/null ]; then
+    if [ $pixelerror == 0 ]; then 
+      exit 0
+    fi
+    echo "Pixel error: $pixelerror"
+  else
+    echo "Pixel error: Err"
+  fi
+  exit 1
+fi
+exit 0