Only unpack masks when necessary

radarhere · Oct 30, 2023 · 8814610 · 8814610
1 parent 5fd3035
commit 8814610
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/src/PIL/DdsImagePlugin.py b/src/PIL/DdsImagePlugin.py
@@ -345,11 +345,11 @@ def _open(self):
 
         # pixel format
         pfsize, pfflags, fourcc, bitcount = struct.unpack("<4I", header.read(16))
-        masks = struct.unpack("<4I", header.read(16))
         n = 0
         rawmode = None
         if pfflags & DDPF.RGB:
             # Texture contains uncompressed RGB data
+            masks = struct.unpack("<4I", header.read(16))
             masks = {mask: ["R", "G", "B", "A"][i] for i, mask in enumerate(masks)}
             if bitcount == 8:
                 self._mode = "L"