490 lines
18 KiB
Python
490 lines
18 KiB
Python
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#
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# The Python Imaging Library.
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# $Id$
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#
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# BMP file handler
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#
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# Windows (and OS/2) native bitmap storage format.
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#
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# history:
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# 1995-09-01 fl Created
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# 1996-04-30 fl Added save
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# 1997-08-27 fl Fixed save of 1-bit images
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# 1998-03-06 fl Load P images as L where possible
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# 1998-07-03 fl Load P images as 1 where possible
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# 1998-12-29 fl Handle small palettes
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# 2002-12-30 fl Fixed load of 1-bit palette images
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# 2003-04-21 fl Fixed load of 1-bit monochrome images
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# 2003-04-23 fl Added limited support for BI_BITFIELDS compression
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#
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# Copyright (c) 1997-2003 by Secret Labs AB
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# Copyright (c) 1995-2003 by Fredrik Lundh
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#
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# See the README file for information on usage and redistribution.
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#
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from __future__ import annotations
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import os
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from typing import IO
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from . import Image, ImageFile, ImagePalette
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from ._binary import i16le as i16
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from ._binary import i32le as i32
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from ._binary import o8
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from ._binary import o16le as o16
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from ._binary import o32le as o32
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#
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# --------------------------------------------------------------------
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# Read BMP file
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BIT2MODE = {
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# bits => mode, rawmode
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1: ("P", "P;1"),
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4: ("P", "P;4"),
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8: ("P", "P"),
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16: ("RGB", "BGR;15"),
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24: ("RGB", "BGR"),
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32: ("RGB", "BGRX"),
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}
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def _accept(prefix: bytes) -> bool:
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return prefix[:2] == b"BM"
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def _dib_accept(prefix: bytes) -> bool:
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return i32(prefix) in [12, 40, 52, 56, 64, 108, 124]
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# =============================================================================
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# Image plugin for the Windows BMP format.
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# =============================================================================
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class BmpImageFile(ImageFile.ImageFile):
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"""Image plugin for the Windows Bitmap format (BMP)"""
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# ------------------------------------------------------------- Description
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format_description = "Windows Bitmap"
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format = "BMP"
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# -------------------------------------------------- BMP Compression values
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COMPRESSIONS = {"RAW": 0, "RLE8": 1, "RLE4": 2, "BITFIELDS": 3, "JPEG": 4, "PNG": 5}
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for k, v in COMPRESSIONS.items():
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vars()[k] = v
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def _bitmap(self, header=0, offset=0):
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"""Read relevant info about the BMP"""
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read, seek = self.fp.read, self.fp.seek
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if header:
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seek(header)
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# read bmp header size @offset 14 (this is part of the header size)
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file_info = {"header_size": i32(read(4)), "direction": -1}
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# -------------------- If requested, read header at a specific position
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# read the rest of the bmp header, without its size
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header_data = ImageFile._safe_read(self.fp, file_info["header_size"] - 4)
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# ------------------------------- Windows Bitmap v2, IBM OS/2 Bitmap v1
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# ----- This format has different offsets because of width/height types
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# 12: BITMAPCOREHEADER/OS21XBITMAPHEADER
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if file_info["header_size"] == 12:
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file_info["width"] = i16(header_data, 0)
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file_info["height"] = i16(header_data, 2)
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file_info["planes"] = i16(header_data, 4)
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file_info["bits"] = i16(header_data, 6)
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file_info["compression"] = self.RAW
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file_info["palette_padding"] = 3
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# --------------------------------------------- Windows Bitmap v3 to v5
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# 40: BITMAPINFOHEADER
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# 52: BITMAPV2HEADER
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# 56: BITMAPV3HEADER
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# 64: BITMAPCOREHEADER2/OS22XBITMAPHEADER
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# 108: BITMAPV4HEADER
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# 124: BITMAPV5HEADER
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elif file_info["header_size"] in (40, 52, 56, 64, 108, 124):
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file_info["y_flip"] = header_data[7] == 0xFF
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file_info["direction"] = 1 if file_info["y_flip"] else -1
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file_info["width"] = i32(header_data, 0)
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file_info["height"] = (
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i32(header_data, 4)
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if not file_info["y_flip"]
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else 2**32 - i32(header_data, 4)
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)
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file_info["planes"] = i16(header_data, 8)
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file_info["bits"] = i16(header_data, 10)
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file_info["compression"] = i32(header_data, 12)
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# byte size of pixel data
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file_info["data_size"] = i32(header_data, 16)
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file_info["pixels_per_meter"] = (
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i32(header_data, 20),
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i32(header_data, 24),
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)
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file_info["colors"] = i32(header_data, 28)
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file_info["palette_padding"] = 4
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self.info["dpi"] = tuple(x / 39.3701 for x in file_info["pixels_per_meter"])
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if file_info["compression"] == self.BITFIELDS:
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masks = ["r_mask", "g_mask", "b_mask"]
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if len(header_data) >= 48:
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if len(header_data) >= 52:
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masks.append("a_mask")
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else:
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file_info["a_mask"] = 0x0
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for idx, mask in enumerate(masks):
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file_info[mask] = i32(header_data, 36 + idx * 4)
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else:
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# 40 byte headers only have the three components in the
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# bitfields masks, ref:
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# https://msdn.microsoft.com/en-us/library/windows/desktop/dd183376(v=vs.85).aspx
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# See also
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# https://github.com/python-pillow/Pillow/issues/1293
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# There is a 4th component in the RGBQuad, in the alpha
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# location, but it is listed as a reserved component,
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# and it is not generally an alpha channel
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file_info["a_mask"] = 0x0
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for mask in masks:
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file_info[mask] = i32(read(4))
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file_info["rgb_mask"] = (
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file_info["r_mask"],
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file_info["g_mask"],
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file_info["b_mask"],
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)
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file_info["rgba_mask"] = (
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file_info["r_mask"],
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file_info["g_mask"],
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file_info["b_mask"],
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file_info["a_mask"],
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)
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else:
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msg = f"Unsupported BMP header type ({file_info['header_size']})"
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raise OSError(msg)
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# ------------------ Special case : header is reported 40, which
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# ---------------------- is shorter than real size for bpp >= 16
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self._size = file_info["width"], file_info["height"]
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# ------- If color count was not found in the header, compute from bits
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file_info["colors"] = (
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file_info["colors"]
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if file_info.get("colors", 0)
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else (1 << file_info["bits"])
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)
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if offset == 14 + file_info["header_size"] and file_info["bits"] <= 8:
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offset += 4 * file_info["colors"]
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# ---------------------- Check bit depth for unusual unsupported values
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self._mode, raw_mode = BIT2MODE.get(file_info["bits"], (None, None))
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if self.mode is None:
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msg = f"Unsupported BMP pixel depth ({file_info['bits']})"
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raise OSError(msg)
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# ---------------- Process BMP with Bitfields compression (not palette)
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decoder_name = "raw"
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if file_info["compression"] == self.BITFIELDS:
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SUPPORTED = {
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32: [
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(0xFF0000, 0xFF00, 0xFF, 0x0),
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(0xFF000000, 0xFF0000, 0xFF00, 0x0),
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(0xFF000000, 0xFF00, 0xFF, 0x0),
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(0xFF000000, 0xFF0000, 0xFF00, 0xFF),
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(0xFF, 0xFF00, 0xFF0000, 0xFF000000),
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(0xFF0000, 0xFF00, 0xFF, 0xFF000000),
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(0xFF000000, 0xFF00, 0xFF, 0xFF0000),
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(0x0, 0x0, 0x0, 0x0),
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],
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24: [(0xFF0000, 0xFF00, 0xFF)],
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16: [(0xF800, 0x7E0, 0x1F), (0x7C00, 0x3E0, 0x1F)],
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}
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MASK_MODES = {
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(32, (0xFF0000, 0xFF00, 0xFF, 0x0)): "BGRX",
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(32, (0xFF000000, 0xFF0000, 0xFF00, 0x0)): "XBGR",
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(32, (0xFF000000, 0xFF00, 0xFF, 0x0)): "BGXR",
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(32, (0xFF000000, 0xFF0000, 0xFF00, 0xFF)): "ABGR",
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(32, (0xFF, 0xFF00, 0xFF0000, 0xFF000000)): "RGBA",
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(32, (0xFF0000, 0xFF00, 0xFF, 0xFF000000)): "BGRA",
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(32, (0xFF000000, 0xFF00, 0xFF, 0xFF0000)): "BGAR",
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(32, (0x0, 0x0, 0x0, 0x0)): "BGRA",
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(24, (0xFF0000, 0xFF00, 0xFF)): "BGR",
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(16, (0xF800, 0x7E0, 0x1F)): "BGR;16",
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(16, (0x7C00, 0x3E0, 0x1F)): "BGR;15",
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}
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if file_info["bits"] in SUPPORTED:
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if (
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file_info["bits"] == 32
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and file_info["rgba_mask"] in SUPPORTED[file_info["bits"]]
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):
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raw_mode = MASK_MODES[(file_info["bits"], file_info["rgba_mask"])]
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self._mode = "RGBA" if "A" in raw_mode else self.mode
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elif (
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file_info["bits"] in (24, 16)
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and file_info["rgb_mask"] in SUPPORTED[file_info["bits"]]
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):
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raw_mode = MASK_MODES[(file_info["bits"], file_info["rgb_mask"])]
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else:
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msg = "Unsupported BMP bitfields layout"
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raise OSError(msg)
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else:
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msg = "Unsupported BMP bitfields layout"
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raise OSError(msg)
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elif file_info["compression"] == self.RAW:
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if file_info["bits"] == 32 and header == 22: # 32-bit .cur offset
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raw_mode, self._mode = "BGRA", "RGBA"
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elif file_info["compression"] in (self.RLE8, self.RLE4):
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decoder_name = "bmp_rle"
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else:
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msg = f"Unsupported BMP compression ({file_info['compression']})"
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raise OSError(msg)
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# --------------- Once the header is processed, process the palette/LUT
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if self.mode == "P": # Paletted for 1, 4 and 8 bit images
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# ---------------------------------------------------- 1-bit images
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if not (0 < file_info["colors"] <= 65536):
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msg = f"Unsupported BMP Palette size ({file_info['colors']})"
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raise OSError(msg)
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else:
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padding = file_info["palette_padding"]
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palette = read(padding * file_info["colors"])
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grayscale = True
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indices = (
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(0, 255)
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if file_info["colors"] == 2
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else list(range(file_info["colors"]))
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)
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# ----------------- Check if grayscale and ignore palette if so
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for ind, val in enumerate(indices):
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rgb = palette[ind * padding : ind * padding + 3]
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if rgb != o8(val) * 3:
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grayscale = False
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# ------- If all colors are gray, white or black, ditch palette
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if grayscale:
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self._mode = "1" if file_info["colors"] == 2 else "L"
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raw_mode = self.mode
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else:
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self._mode = "P"
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self.palette = ImagePalette.raw(
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"BGRX" if padding == 4 else "BGR", palette
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)
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# ---------------------------- Finally set the tile data for the plugin
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self.info["compression"] = file_info["compression"]
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args = [raw_mode]
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if decoder_name == "bmp_rle":
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args.append(file_info["compression"] == self.RLE4)
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else:
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args.append(((file_info["width"] * file_info["bits"] + 31) >> 3) & (~3))
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args.append(file_info["direction"])
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self.tile = [
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(
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decoder_name,
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(0, 0, file_info["width"], file_info["height"]),
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offset or self.fp.tell(),
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tuple(args),
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)
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]
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def _open(self) -> None:
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"""Open file, check magic number and read header"""
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# read 14 bytes: magic number, filesize, reserved, header final offset
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head_data = self.fp.read(14)
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# choke if the file does not have the required magic bytes
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if not _accept(head_data):
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msg = "Not a BMP file"
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raise SyntaxError(msg)
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# read the start position of the BMP image data (u32)
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offset = i32(head_data, 10)
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# load bitmap information (offset=raster info)
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self._bitmap(offset=offset)
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class BmpRleDecoder(ImageFile.PyDecoder):
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_pulls_fd = True
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def decode(self, buffer: bytes) -> tuple[int, int]:
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assert self.fd is not None
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rle4 = self.args[1]
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data = bytearray()
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x = 0
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dest_length = self.state.xsize * self.state.ysize
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while len(data) < dest_length:
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pixels = self.fd.read(1)
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byte = self.fd.read(1)
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if not pixels or not byte:
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break
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num_pixels = pixels[0]
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if num_pixels:
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# encoded mode
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if x + num_pixels > self.state.xsize:
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# Too much data for row
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num_pixels = max(0, self.state.xsize - x)
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if rle4:
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first_pixel = o8(byte[0] >> 4)
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second_pixel = o8(byte[0] & 0x0F)
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for index in range(num_pixels):
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if index % 2 == 0:
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data += first_pixel
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else:
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data += second_pixel
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else:
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data += byte * num_pixels
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x += num_pixels
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else:
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if byte[0] == 0:
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# end of line
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while len(data) % self.state.xsize != 0:
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data += b"\x00"
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x = 0
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elif byte[0] == 1:
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# end of bitmap
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break
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elif byte[0] == 2:
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# delta
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bytes_read = self.fd.read(2)
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if len(bytes_read) < 2:
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break
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right, up = self.fd.read(2)
|
||
|
|
data += b"\x00" * (right + up * self.state.xsize)
|
||
|
|
x = len(data) % self.state.xsize
|
||
|
|
else:
|
||
|
|
# absolute mode
|
||
|
|
if rle4:
|
||
|
|
# 2 pixels per byte
|
||
|
|
byte_count = byte[0] // 2
|
||
|
|
bytes_read = self.fd.read(byte_count)
|
||
|
|
for byte_read in bytes_read:
|
||
|
|
data += o8(byte_read >> 4)
|
||
|
|
data += o8(byte_read & 0x0F)
|
||
|
|
else:
|
||
|
|
byte_count = byte[0]
|
||
|
|
bytes_read = self.fd.read(byte_count)
|
||
|
|
data += bytes_read
|
||
|
|
if len(bytes_read) < byte_count:
|
||
|
|
break
|
||
|
|
x += byte[0]
|
||
|
|
|
||
|
|
# align to 16-bit word boundary
|
||
|
|
if self.fd.tell() % 2 != 0:
|
||
|
|
self.fd.seek(1, os.SEEK_CUR)
|
||
|
|
rawmode = "L" if self.mode == "L" else "P"
|
||
|
|
self.set_as_raw(bytes(data), (rawmode, 0, self.args[-1]))
|
||
|
|
return -1, 0
|
||
|
|
|
||
|
|
|
||
|
|
# =============================================================================
|
||
|
|
# Image plugin for the DIB format (BMP alias)
|
||
|
|
# =============================================================================
|
||
|
|
class DibImageFile(BmpImageFile):
|
||
|
|
format = "DIB"
|
||
|
|
format_description = "Windows Bitmap"
|
||
|
|
|
||
|
|
def _open(self) -> None:
|
||
|
|
self._bitmap()
|
||
|
|
|
||
|
|
|
||
|
|
#
|
||
|
|
# --------------------------------------------------------------------
|
||
|
|
# Write BMP file
|
||
|
|
|
||
|
|
|
||
|
|
SAVE = {
|
||
|
|
"1": ("1", 1, 2),
|
||
|
|
"L": ("L", 8, 256),
|
||
|
|
"P": ("P", 8, 256),
|
||
|
|
"RGB": ("BGR", 24, 0),
|
||
|
|
"RGBA": ("BGRA", 32, 0),
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
def _dib_save(im: Image.Image, fp: IO[bytes], filename: str | bytes) -> None:
|
||
|
|
_save(im, fp, filename, False)
|
||
|
|
|
||
|
|
|
||
|
|
def _save(
|
||
|
|
im: Image.Image, fp: IO[bytes], filename: str | bytes, bitmap_header: bool = True
|
||
|
|
) -> None:
|
||
|
|
try:
|
||
|
|
rawmode, bits, colors = SAVE[im.mode]
|
||
|
|
except KeyError as e:
|
||
|
|
msg = f"cannot write mode {im.mode} as BMP"
|
||
|
|
raise OSError(msg) from e
|
||
|
|
|
||
|
|
info = im.encoderinfo
|
||
|
|
|
||
|
|
dpi = info.get("dpi", (96, 96))
|
||
|
|
|
||
|
|
# 1 meter == 39.3701 inches
|
||
|
|
ppm = tuple(int(x * 39.3701 + 0.5) for x in dpi)
|
||
|
|
|
||
|
|
stride = ((im.size[0] * bits + 7) // 8 + 3) & (~3)
|
||
|
|
header = 40 # or 64 for OS/2 version 2
|
||
|
|
image = stride * im.size[1]
|
||
|
|
|
||
|
|
if im.mode == "1":
|
||
|
|
palette = b"".join(o8(i) * 4 for i in (0, 255))
|
||
|
|
elif im.mode == "L":
|
||
|
|
palette = b"".join(o8(i) * 4 for i in range(256))
|
||
|
|
elif im.mode == "P":
|
||
|
|
palette = im.im.getpalette("RGB", "BGRX")
|
||
|
|
colors = len(palette) // 4
|
||
|
|
else:
|
||
|
|
palette = None
|
||
|
|
|
||
|
|
# bitmap header
|
||
|
|
if bitmap_header:
|
||
|
|
offset = 14 + header + colors * 4
|
||
|
|
file_size = offset + image
|
||
|
|
if file_size > 2**32 - 1:
|
||
|
|
msg = "File size is too large for the BMP format"
|
||
|
|
raise ValueError(msg)
|
||
|
|
fp.write(
|
||
|
|
b"BM" # file type (magic)
|
||
|
|
+ o32(file_size) # file size
|
||
|
|
+ o32(0) # reserved
|
||
|
|
+ o32(offset) # image data offset
|
||
|
|
)
|
||
|
|
|
||
|
|
# bitmap info header
|
||
|
|
fp.write(
|
||
|
|
o32(header) # info header size
|
||
|
|
+ o32(im.size[0]) # width
|
||
|
|
+ o32(im.size[1]) # height
|
||
|
|
+ o16(1) # planes
|
||
|
|
+ o16(bits) # depth
|
||
|
|
+ o32(0) # compression (0=uncompressed)
|
||
|
|
+ o32(image) # size of bitmap
|
||
|
|
+ o32(ppm[0]) # resolution
|
||
|
|
+ o32(ppm[1]) # resolution
|
||
|
|
+ o32(colors) # colors used
|
||
|
|
+ o32(colors) # colors important
|
||
|
|
)
|
||
|
|
|
||
|
|
fp.write(b"\0" * (header - 40)) # padding (for OS/2 format)
|
||
|
|
|
||
|
|
if palette:
|
||
|
|
fp.write(palette)
|
||
|
|
|
||
|
|
ImageFile._save(im, fp, [("raw", (0, 0) + im.size, 0, (rawmode, stride, -1))])
|
||
|
|
|
||
|
|
|
||
|
|
#
|
||
|
|
# --------------------------------------------------------------------
|
||
|
|
# Registry
|
||
|
|
|
||
|
|
|
||
|
|
Image.register_open(BmpImageFile.format, BmpImageFile, _accept)
|
||
|
|
Image.register_save(BmpImageFile.format, _save)
|
||
|
|
|
||
|
|
Image.register_extension(BmpImageFile.format, ".bmp")
|
||
|
|
|
||
|
|
Image.register_mime(BmpImageFile.format, "image/bmp")
|
||
|
|
|
||
|
|
Image.register_decoder("bmp_rle", BmpRleDecoder)
|
||
|
|
|
||
|
|
Image.register_open(DibImageFile.format, DibImageFile, _dib_accept)
|
||
|
|
Image.register_save(DibImageFile.format, _dib_save)
|
||
|
|
|
||
|
|
Image.register_extension(DibImageFile.format, ".dib")
|
||
|
|
|
||
|
|
Image.register_mime(DibImageFile.format, "image/bmp")
|