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Recipe 577575 revision 2 

def scale(w, h, x, y, maximum=True):
        nw = y * w / h
        nh = x * h / w
        if maximum ^ (nw >= x):
                return nw or 1, y
        return x, nh or 1

Diff to Previous Revision

--- revision 1 2011-02-17 18:28:20
+++ revision 2 2011-02-20 22:36:39
@@ -1,6 +1,6 @@
 def scale(w, h, x, y, maximum=True):
         nw = y * w / h
         nh = x * h / w
-        if maximum ^ (nw >= nh):
-                return nw, y
-        return x, nh
+        if maximum ^ (nw >= x):
+                return nw or 1, y
+        return x, nh or 1

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