From 915df6c7cf79007849a5c78972f5e81a6497850a Mon Sep 17 00:00:00 2001
From: jlwoolf <jlwoolf@protonmail.com>
Date: Tue, 27 Sep 2022 12:30:32 -0600
Subject: [PATCH] fixed bug regarding bitmap (added alpha flag)

---
 src/PIL/AniImagePlugin.py | 6 ++++--
 src/PIL/BmpImagePlugin.py | 7 +++++--
 src/PIL/CurImagePlugin.py | 6 ++++--
 3 files changed, 13 insertions(+), 6 deletions(-)

diff --git a/src/PIL/AniImagePlugin.py b/src/PIL/AniImagePlugin.py
index d4ec37da4..9e25cded4 100644
--- a/src/PIL/AniImagePlugin.py
+++ b/src/PIL/AniImagePlugin.py
@@ -58,13 +58,15 @@ def _save_frame(im: Image.Image, fp: BytesIO, filename: str, info: dict):
 
         image_io = BytesIO()
         if bmp:
-            frame.save(image_io, "dib")
-
             if bits != 32:
                 and_mask = Image.new("1", size)
                 ImageFile._save(
                     and_mask, image_io, [("raw", (0, 0) + size, 0, ("1", 0, -1))]
                 )
+            else:
+                frame.alpha = True
+
+            frame.save(image_io, "dib")
         else:
             frame.save(image_io, "png")
         image_io.seek(0)
diff --git a/src/PIL/BmpImagePlugin.py b/src/PIL/BmpImagePlugin.py
index bc81f3274..8e69acd36 100644
--- a/src/PIL/BmpImagePlugin.py
+++ b/src/PIL/BmpImagePlugin.py
@@ -209,8 +209,11 @@ class BmpImageFile(ImageFile.ImageFile):
             else:
                 raise OSError("Unsupported BMP bitfields layout")
         elif file_info["compression"] == self.RAW:
-            if file_info["bits"] == 32:  # 32-bit has transparency
-                raw_mode, self.mode = "BGRA", "RGBA"
+            try:
+                if file_info["bits"] == 32 and self.alpha:
+                    raw_mode, self.mode = "BGRA", "RGBA"
+            except AttributeError:
+                pass
         elif file_info["compression"] == self.RLE8:
             decoder_name = "bmp_rle"
         else:
diff --git a/src/PIL/CurImagePlugin.py b/src/PIL/CurImagePlugin.py
index 9e60ecc1f..ba11d08cc 100644
--- a/src/PIL/CurImagePlugin.py
+++ b/src/PIL/CurImagePlugin.py
@@ -76,13 +76,15 @@ def _save(im: Image.Image, fp: BytesIO, filename: str):
 
         image_io = BytesIO()
         if bmp:
-            frame.save(image_io, "dib")
-
             if bits != 32:
                 and_mask = Image.new("1", size)
                 ImageFile._save(
                     and_mask, image_io, [("raw", (0, 0) + size, 0, ("1", 0, -1))]
                 )
+            else:
+                frame.alpha = True
+
+            frame.save(image_io, "dib")
         else:
             frame.save(image_io, "png")
         image_io.seek(0)