Dear all,
    I have "GdkDrawable* main" as main layer, and "GdkDrawable* layer1".
    Now I draw a jpeg on main (by GdkPixbuf), and clear layer1 with 
alpha channel value 0, draw a line with alpha channel value 1 (by 
Cairo), then gdk_draw_drawable layer1 to main. The result I wanted was a 
jpeg with a line on it, but I got a jpeg with the region of layer1 
transparent and a line on it.
    What is the problem?

Thanks.
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