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?
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