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snippet_normalize (cr, width, height) cr.arc (0.5, 0.5, 0.3, 0, 2 * M_PI) cr.clip () cr.rectangle (0, 0, 1, 1) cr.fill () cr.set_source_rgb (0, 1, 0) cr.move_to (0, 0) cr.line_to (1, 1) cr.move_to (1, 0) cr.line_to (0, 1) cr.stroke ()