# File lib/RMagick.rb, line 1040
        def initialize(img, x, y, width, height)
            img.check_destroyed
            if width <= 0 || height <= 0
                Kernel.raise ArgumentError, "invalid geometry (#{width}x#{height}+#{x}+#{y})"
            end
            if x < 0 || y < 0 || (x+width) > img.columns || (y+height) > img.rows
                Kernel.raise RangeError, "geometry (#{width}x#{height}+#{x}+#{y}) exceeds image boundary"
            end
            @view = img.get_pixels(x, y, width, height)
            @img = img
            @x = x
            @y = y
            @width = width
            @height = height
            @dirty = false
        end