lib/chunky_png/canvas/operations.rb in chunky_png-0.9.2 vs lib/chunky_png/canvas/operations.rb in chunky_png-0.10.0

@@ -27,10 +27,10 @@
       def compose(other, offset_x = 0, offset_y = 0)
         check_size_constraints!(other, offset_x, offset_y)
 
         for y in 0...other.height do
           for x in 0...other.width do
-            self[x + offset_x, y + offset_y] = ChunkyPNG::Color.compose(other[x, y], self[x + offset_x, y + offset_y])
+            set_pixel(x + offset_x, y + offset_y, ChunkyPNG::Color.compose(other.get_pixel(x, y), get_pixel(x + offset_x, y + offset_y)))
           end
         end
         self
       end