add to_a

jcupitt · jcupitt · commit 47cf9a8638aa · 2016-06-20T14:45:36.000+01:00
image.to_a makes a Ruby array from an image ... handy with stats, for
example
diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -4,6 +4,7 @@
 
 * simplify gemspec [sandstrom]
 * remove jeweler dependency [John Cupitt]
+* add `.to_a` to Image [John Cupitt]
 
 # Version 1.0.0
 
diff --git a/lib/vips/image.rb b/lib/vips/image.rb
@@ -926,6 +926,21 @@ def [](index)
             end
         end
 
+        # Convert to an Array. This will be very slow for large images. 
+        #
+        # @return [Array] array of Fixnum
+        def to_a
+            ar = Array.new(height)
+            for y in 0...height
+                ar[y] = Array.new(width)
+                    for x in 0...width
+                        ar[y][x] = getpoint(x, y)
+                    end
+            end
+
+            return ar
+        end
+
         # Return the largest integral value not greater than the argument.
         #
         # @return [Image] floor of image 
