Initial (skeleton) version of universal image format converter

Demo/sgi/video/imgconv.py

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+import imageop
+
+error = 'imgconv.error'
+
+LOSSY = 1
+NOT_LOSSY = 0
+
+def null(img, x, y):
+	return img
+	
+def mono2grey(img, x, y):
+	imageop.mono2grey(img, x, y, 0, 255)
+
+converters = [ \
+	  ('grey',  'grey4', imageop.grey2grey4,   LOSSY), \
+	  ('grey',  'grey2', imageop.dither2grey2, LOSSY), \
+	  ('grey',  'mono',  imageop.dither2mono,  LOSSY), \
+	  ('mono',  'grey',  mono2grey,            NOT_LOSSY), \
+	  ('grey2', 'grey',  imageop.grey22grey,   NOT_LOSSY), \
+	  ('grey4', 'grey',  imageop.grey42grey,   NOT_LOSSY), \
+]
+
+def addconverter(fcs, tcs, lossy, func):
+	for i in range(len(converters)):
+		ifcs, itcs, irtn, ilossy = converters[i]
+		if (fcs, tcs) == (ifcs, itcs):
+			converters[i] = (fcs, tcs, func, lossy)
+			return
+	converters.append((fcs,tcs,lossy,func))
+
+def getconverter(fcs, tcs):
+	if fcs == tcs: return null
+	
+	for ifcs, itcs, irtn, ilossy in converters:
+		if (fcs, tcs) == (ifcs, itcs):
+			return irtn
+	raise error, 'Sorry, that conversion is not implemented'
+