PDFBOX-5660: optimize, as suggested by Valery Bokov; closes #266

git-svn-id: https://svn.apache.org/repos/asf/pdfbox/trunk@1928793 13f79535-47bb-0310-9956-ffa450edef68

Author: THausherr

pdfbox/src/main/java/org/apache/pdfbox/pdmodel/interactive/form/AppearanceGeneratorHelper.java

@@ -728,13 +728,13 @@ private void insertGeneratedCombAppearance(PDAppearanceContentStream contents, P
         int maxLen = ((PDTextField) field).getMaxLen();
         int quadding = field.getQ();
         int numChars = Math.min(value.length(), maxLen);
-                
-        float combWidth = appearanceStream.getBBox().getWidth() / maxLen;
+
+        PDRectangle bBox = appearanceStream.getBBox();
+        float combWidth = bBox.getWidth() / maxLen;
         float ascentAtFontSize = font.getFontDescriptor().getAscent() / FONTSCALE * fontSize;
 
-        float baselineOffset = appearanceStream.getBBox().getLowerLeftY() +  
-                (appearanceStream.getBBox().getHeight() - ascentAtFontSize)/2;
-        
+        float baselineOffset = bBox.getLowerLeftY() + (bBox.getHeight() - ascentAtFontSize) / 2;
+
         float prevCharWidth = 0f;
 
         // set initial offset based on width of first char.