Why doesn't GTK support depths < 8 bit?


I am surprised to see that GTK only supports 
   possible_depths[5] = { 32, 24, 16, 15, 8 }

bit deep displays. 

Why that? It may be difficult to support 1bpp screens (dithering), but
what about 4bpp pseudocolor visuals?

Does GTK really need 256 differend colours?


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