drawn in a image



I need to load a image from file and drawn in the image a line, arc, using the drawing primitives. 
How I do it ?

actually I know how to load a image in a pixbuf and after manipulate it using a vector that have the
image, but I can't use the drawing primitives...

pixbuf=gdk_pixbuf_new_from_file("image.png");
vector=gdk_pixbuf_get_pixels(pixbuf);

Thanks for the Help - Vinicius
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