# File gtk/sample/gtk-demo/pixbufs.rb, line 108 def expose_cb(widget, event) rowstride = @frame.rowstride pixels = @frame.pixels pixels[0, rowstride * event.area.y + event.area.x * 3] = '' Gdk::RGB.draw_rgb_image(widget.window, widget.style.black_gc, event.area.x, event.area.y, event.area.width, event.area.height, Gdk::RGB::Dither::NORMAL, pixels, rowstride, event.area.x, event.area.y) true end