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- #
- # 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")
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