forked from 170010011/fr
91 lines
2.4 KiB
Python
91 lines
2.4 KiB
Python
|
#
|
||
|
|
# 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 . import ImageFile, ImagePalette, UnidentifiedImageError
|
||
|
|
from ._binary import i16be as i16
|
||
|
|
from ._binary import i32be as i32
|
||
|
|
|
||
|
|
|
||
|
|
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):
|
||
|
|
|
||
|
|
# Header
|
||
|
|
s = self.fp.read(1037)
|
||
|
|
|
||
|
|
if not i16(s) in [65534, 65535]:
|
||
|
|
raise SyntaxError("Not a valid GD 2.x .gd file")
|
||
|
|
|
||
|
|
self.mode = "L" # FIXME: "P"
|
||
|
|
self._size = i16(s, 2), i16(s, 4)
|
||
|
|
|
||
|
|
trueColor = s[6]
|
||
|
|
trueColorOffset = 2 if trueColor else 0
|
||
|
|
|
||
|
|
# transparency index
|
||
|
|
tindex = i32(s, 7 + trueColorOffset)
|
||
|
|
if tindex < 256:
|
||
|
|
self.info["transparency"] = tindex
|
||
|
|
|
||
|
|
self.palette = ImagePalette.raw(
|
||
|
|
"XBGR", s[7 + trueColorOffset + 4 : 7 + trueColorOffset + 4 + 256 * 4]
|
||
|
|
)
|
||
|
|
|
||
|
|
self.tile = [
|
||
|
|
("raw", (0, 0) + self.size, 7 + trueColorOffset + 4 + 256 * 4, ("L", 0, 1))
|
||
|
|
]
|
||
|
|
|
||
|
|
|
||
|
|
def open(fp, mode="r"):
|
||
|
|
"""
|
||
|
|
Load texture from a GD image file.
|
||
|
|
|
||
|
|
:param filename: 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":
|
||
|
|
raise ValueError("bad mode")
|
||
|
|
|
||
|
|
try:
|
||
|
|
return GdImageFile(fp)
|
||
|
|
except SyntaxError as e:
|
||
|
|
raise UnidentifiedImageError("cannot identify this image file") from e
|