You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
96 lines
2.7 KiB
96 lines
2.7 KiB
#
|
|
# The Python Imaging Library
|
|
#
|
|
# load a GIMP brush file
|
|
#
|
|
# History:
|
|
# 96-03-14 fl Created
|
|
# 16-01-08 es Version 2
|
|
#
|
|
# Copyright (c) Secret Labs AB 1997.
|
|
# Copyright (c) Fredrik Lundh 1996.
|
|
# Copyright (c) Eric Soroos 2016.
|
|
#
|
|
# See the README file for information on usage and redistribution.
|
|
#
|
|
#
|
|
# See https://github.com/GNOME/gimp/blob/master/devel-docs/gbr.txt for
|
|
# format documentation.
|
|
#
|
|
# This code Interprets version 1 and 2 .gbr files.
|
|
# Version 1 files are obsolete, and should not be used for new
|
|
# brushes.
|
|
# Version 2 files are saved by GIMP v2.8 (at least)
|
|
# Version 3 files have a format specifier of 18 for 16bit floats in
|
|
# the color depth field. This is currently unsupported by Pillow.
|
|
|
|
from . import Image, ImageFile
|
|
from ._binary import i32be as i32
|
|
|
|
|
|
def _accept(prefix):
|
|
return len(prefix) >= 8 and \
|
|
i32(prefix[:4]) >= 20 and i32(prefix[4:8]) in (1, 2)
|
|
|
|
|
|
##
|
|
# Image plugin for the GIMP brush format.
|
|
|
|
class GbrImageFile(ImageFile.ImageFile):
|
|
|
|
format = "GBR"
|
|
format_description = "GIMP brush file"
|
|
|
|
def _open(self):
|
|
header_size = i32(self.fp.read(4))
|
|
version = i32(self.fp.read(4))
|
|
if header_size < 20:
|
|
raise SyntaxError("not a GIMP brush")
|
|
if version not in (1, 2):
|
|
raise SyntaxError("Unsupported GIMP brush version: %s" % version)
|
|
|
|
width = i32(self.fp.read(4))
|
|
height = i32(self.fp.read(4))
|
|
color_depth = i32(self.fp.read(4))
|
|
if width <= 0 or height <= 0:
|
|
raise SyntaxError("not a GIMP brush")
|
|
if color_depth not in (1, 4):
|
|
raise SyntaxError(
|
|
"Unsupported GIMP brush color depth: %s" % color_depth)
|
|
|
|
if version == 1:
|
|
comment_length = header_size-20
|
|
else:
|
|
comment_length = header_size-28
|
|
magic_number = self.fp.read(4)
|
|
if magic_number != b'GIMP':
|
|
raise SyntaxError("not a GIMP brush, bad magic number")
|
|
self.info['spacing'] = i32(self.fp.read(4))
|
|
|
|
comment = self.fp.read(comment_length)[:-1]
|
|
|
|
if color_depth == 1:
|
|
self.mode = "L"
|
|
else:
|
|
self.mode = 'RGBA'
|
|
|
|
self._size = width, height
|
|
|
|
self.info["comment"] = comment
|
|
|
|
# Image might not be small
|
|
Image._decompression_bomb_check(self.size)
|
|
|
|
# Data is an uncompressed block of w * h * bytes/pixel
|
|
self._data_size = width * height * color_depth
|
|
|
|
def load(self):
|
|
self.im = Image.core.new(self.mode, self.size)
|
|
self.frombytes(self.fp.read(self._data_size))
|
|
|
|
#
|
|
# registry
|
|
|
|
|
|
Image.register_open(GbrImageFile.format, GbrImageFile, _accept)
|
|
Image.register_extension(GbrImageFile.format, ".gbr")
|