Merge pull request #8175 from vladmandic/image_size

adds checks for resulting image size to avoid memory issues

scripts/xyz_grid.py

@@ -499,6 +499,11 @@ class Script(scripts.Script):
         z_opt = self.current_axis_options[z_type]
         zs = process_axis(z_opt, z_values)
 
+        # this could be moved to common code, but unlikely to be ever triggered anywhere else
+        Image.MAX_IMAGE_PIXELS = opts.img_max_size_mp * 1.1 # allow 10% overhead for margins and legend
+        grid_mp = round(len(xs) * len(ys) * len(zs) * p.width * p.height / 1000000)
+        assert grid_mp < opts.img_max_size_mp, f'Error: Resulting grid would be too large ({grid_mp} MPixels) (max configured size is {opts.img_max_size_mp} MPixels)'
+
         def fix_axis_seeds(axis_opt, axis_list):
             if axis_opt.label in ['Seed', 'Var. seed']:
                 return [int(random.randrange(4294967294)) if val is None or val == '' or val == -1 else val for val in axis_list]