fix pfflags and mipmap count

quicktex/dds.py

@@ -166,7 +166,7 @@ class DDSFile:
 
             # WRITE HEADER
             file.write(struct.pack('<7I44x', DDSFile.header_bytes, int(self.flags), self.size[1], self.size[0], self.pitch, self.depth, self.mipmap_count))
-            file.write(struct.pack('<2I4s5I', 32, int(self.flags), bytes(self.four_cc, 'ascii'), self.pixel_size, *self.pixel_bitmasks))
+            file.write(struct.pack('<2I4s5I', 32, int(self.pfflags), bytes(self.four_cc, 'ascii'), self.pixel_size, *self.pixel_bitmasks))
             file.write(struct.pack('<4I4x', *self.caps))
 
             assert file.tell() == 4 + DDSFile.header_bytes, 'error writing file: incorrect header size'

quicktex/image_utils.py

@@ -19,7 +19,7 @@ def mip_sizes(dimensions: Tuple[int, int], mip_count: Optional[int] = None) -> L
     """
     assert all([dim > 0 for dim in dimensions]), "Invalid source dimensions"
     if not mip_count:
-        mip_count = math.ceil(math.log2(max(dimensions)))  # maximum possible number of mips for a given source
+        mip_count = math.ceil(math.log2(max(dimensions)) + 1)  # maximum possible number of mips for a given source
 
     assert mip_count > 0, "mip_count must be greater than 0"