move some properties to attributes as they're not supposed to change

floatimg/image.py

@@ -126,22 +126,24 @@ class FloatImg:
     """
 
     # proxy attributes to the C_FloatImg structure
+    # TODO: now more about them
     magic = property(lambda self: self.c_img.magic)
-    width = property(lambda self: self.c_img.width)
-    height = property(lambda self: self.c_img.height)
-    type_id = property(lambda self: self.c_img.type)
     fval = property(lambda self: self.c_img.fval)
     count = property(lambda self: self.c_img.count)
 
     # oh yeah, really really sluggish access to pixels img.R[0].contents
     # however, pixel data are not designed to be accessed this way
-    R = property(
-        lambda self: pointer(self.c_img.contents.R)[: self.width * self.height]
-    )
+    # R = property(
+    #     lambda self: pointer(self.c_img.contents.R)[: self.width * self.height]
+    # )
 
     #######################################################################################################
     def __init__(self, c_img):
         self.c_img = c_img
+        self.width = c_img.width
+        self.height = c_img.height
+        self.type_id = c_img.type
+        # convenient pointer for later calls to C library
         self.c_img_p = ct.pointer(c_img)
 
     #######################################################################################################
@@ -160,7 +162,7 @@ class FloatImg:
     #######################################################################################################
     def clear(self):
         """clear data"""
-        return c_fimg_clear(self.c_img_p)
+        assert c_fimg_clear(self.c_img_p) == 0
 
     #######################################################################################################
     def clone(self, flags=0):
@@ -220,6 +222,12 @@ class FloatImg:
             == 0
         )
 
+    # TODO
+    # fimg_plot_rgb
+    # fimg_add_rgb
+
+    # export(fname, flags) : depending file extension, save to the correct format
+
 
 ###########################################################################################################
 def fileinfos(fname):