Make scanner work when scan_dim is not passed as a tuple but other ar…

…ray-like. (#281)

ppafm/ocl/relax.py

@@ -176,7 +176,7 @@ def prepareBuffers(self, FEin_np=None, lvec=None, FEin_cl=None, FEin_shape=None,
 
         # see: https://stackoverflow.com/questions/39533635/pyopencl-3d-rgba-image-from-numpy-array
         if scan_dim is not None:
-            self.scan_dim = scan_dim
+            self.scan_dim = tuple(scan_dim)
             fsize = np.dtype(np.float32).itemsize
             f4size = fsize * 4
             nxy = self.scan_dim[0] * self.scan_dim[1]
@@ -194,14 +194,7 @@ def prepareBuffers(self, FEin_np=None, lvec=None, FEin_cl=None, FEin_shape=None,
                 nbytes += bsz * self.nDimConvOut
                 self.cl_WZconv = cl.Buffer(self.ctx, mf.READ_ONLY, fsize * self.nDimConv)
                 nbytes += fsize * self.nDimConv
-                self.FEconv = np.empty(
-                    self.scan_dim[:2]
-                    + (
-                        self.nDimConvOut,
-                        4,
-                    ),
-                    dtype=np.float32,
-                )
+                self.FEconv = self.prepareFEConv()
 
         if bZMap:
             self.cl_zMap = cl.Buffer(self.ctx, mf.WRITE_ONLY, nxy * fsize)
@@ -257,6 +250,9 @@ def tryReleaseBuffers(self):
         except:
             pass
 
+    def prepareFEConv(self):
+        return np.empty(self.scan_dim[:2] + (self.nDimConvOut, 4), dtype=np.float32)
+
     def preparePosBasis(self, start=(-5.0, -5.0), end=(5.0, 5.0)):
         self.start = start
         self.end = end
@@ -474,16 +470,6 @@ def run_getFEinStrokesTilted(self, FEout=None, FEin=None, lvec=None, nz=None):
         self.queue.finish()
         return FEout
 
-    def prepareFEConv(self):
-        return np.empty(
-            self.scan_dim[:2]
-            + (
-                self.nDimConvOut,
-                4,
-            ),
-            dtype=np.float32,
-        )
-
     def run_convolveZ(self, FEconv=None, nz=None):
         """
         convolve 3D forcefield in FEout with 1D weight mask WZconv