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| # | |
| # The Python Imaging Library. | |
| # $Id$ | |
| # | |
| # GD file handling | |
| # | |
| # History: | |
| # 1996-04-12 fl Created | |
| # | |
| # Copyright (c) 1997 by Secret Labs AB. | |
| # Copyright (c) 1996 by Fredrik Lundh. | |
| # | |
| # See the README file for information on usage and redistribution. | |
| # | |
| """ | |
| .. note:: | |
| This format cannot be automatically recognized, so the | |
| class is not registered for use with :py:func:`PIL.Image.open()`. To open a | |
| gd file, use the :py:func:`PIL.GdImageFile.open()` function instead. | |
| .. warning:: | |
| THE GD FORMAT IS NOT DESIGNED FOR DATA INTERCHANGE. This | |
| implementation is provided for convenience and demonstrational | |
| purposes only. | |
| """ | |
| from __future__ import annotations | |
| from typing import IO | |
| from . import ImageFile, ImagePalette, UnidentifiedImageError | |
| from ._binary import i16be as i16 | |
| from ._binary import i32be as i32 | |
| from ._typing import StrOrBytesPath | |
| class GdImageFile(ImageFile.ImageFile): | |
| """ | |
| Image plugin for the GD uncompressed format. Note that this format | |
| is not supported by the standard :py:func:`PIL.Image.open()` function. To use | |
| this plugin, you have to import the :py:mod:`PIL.GdImageFile` module and | |
| use the :py:func:`PIL.GdImageFile.open()` function. | |
| """ | |
| format = "GD" | |
| format_description = "GD uncompressed images" | |
| def _open(self) -> None: | |
| # Header | |
| assert self.fp is not None | |
| s = self.fp.read(1037) | |
| if i16(s) not in [65534, 65535]: | |
| msg = "Not a valid GD 2.x .gd file" | |
| raise SyntaxError(msg) | |
| self._mode = "L" # FIXME: "P" | |
| self._size = i16(s, 2), i16(s, 4) | |
| true_color = s[6] | |
| true_color_offset = 2 if true_color else 0 | |
| # transparency index | |
| tindex = i32(s, 7 + true_color_offset) | |
| if tindex < 256: | |
| self.info["transparency"] = tindex | |
| self.palette = ImagePalette.raw( | |
| "XBGR", s[7 + true_color_offset + 4 : 7 + true_color_offset + 4 + 256 * 4] | |
| ) | |
| self.tile = [ | |
| ( | |
| "raw", | |
| (0, 0) + self.size, | |
| 7 + true_color_offset + 4 + 256 * 4, | |
| ("L", 0, 1), | |
| ) | |
| ] | |
| def open(fp: StrOrBytesPath | IO[bytes], mode: str = "r") -> GdImageFile: | |
| """ | |
| Load texture from a GD image file. | |
| :param fp: GD file name, or an opened file handle. | |
| :param mode: Optional mode. In this version, if the mode argument | |
| is given, it must be "r". | |
| :returns: An image instance. | |
| :raises OSError: If the image could not be read. | |
| """ | |
| if mode != "r": | |
| msg = "bad mode" | |
| raise ValueError(msg) | |
| try: | |
| return GdImageFile(fp) | |
| except SyntaxError as e: | |
| msg = "cannot identify this image file" | |
| raise UnidentifiedImageError(msg) from e | |