Decode JPEG compressed BLP1 data in original mode

Author: radarhere

Tests/images/blp/blp1_jpeg2.blp

@@ -14,6 +14,9 @@ def test_load_blp1():
     with Image.open("Tests/images/blp/blp1_jpeg.blp") as im:
         assert_image_equal_tofile(im, "Tests/images/blp/blp1_jpeg.png")
 
+    with Image.open("Tests/images/blp/blp1_jpeg2.blp") as im:
+        im.load()
+
 
 def test_load_blp2_raw():
     with Image.open("Tests/images/blp/blp2_raw.blp") as im:

Tests/test_file_blp.py

@@ -373,8 +373,8 @@ def _decode_jpeg_stream(self):
         data = BytesIO(data)
         image = JpegImageFile(data)
         Image._decompression_bomb_check(image.size)
-        image.mode = "RGB"
-        image.tile = [("jpeg", (0, 0) + self.size, 0, ("BGRX", ""))]
+        r, g, b = image.convert("RGB").split()
+        image = Image.merge("RGB", (b, g, r))
         self.set_as_raw(image.tobytes())