set unlimited tile to large value, clarify variable names

api/onnx_web/chain/base.py

@@ -209,8 +209,8 @@ class ChainPipeline:
                     if len(extra_tiles) > 1:
                         for layer in extra_tiles:
                             layer_output = Image.new("RGB", output.size)
-                            for tile, dims in layer:
-                                layer_output.paste(tile, (dims[0], dims[1]))
+                            for layer_tile, dims in layer:
+                                layer_output.paste(layer_tile, (dims[0], dims[1]))
 
                             stage_outputs.append(layer_output)
 

api/onnx_web/params.py

@@ -14,7 +14,6 @@ Point = Tuple[int, int]
 
 
 class SizeChart(IntEnum):
-    unlimited = 0
     mini = 128  # small tile for very expensive models
     half = 256  # half tile for outpainting
     auto = 512  # auto tile size
@@ -25,6 +24,7 @@ class SizeChart(IntEnum):
     hd16k = 2**14
     hd32k = 2**15
     hd64k = 2**16
+    unlimited = 2**32 # sort of
 
 
 class TileOrder: