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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/mainline/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 __future__ import annotations

from . import Image, ImageFile

from ._binary import i32be as i32

def _accept(prefix: bytes) -> bool:

return len(prefix) >= 8 and i32(prefix, 0) >= 20 and i32(prefix, 4) in (1, 2)

##

# Image plugin for the GIMP brush format.

class GbrImageFile(ImageFile.ImageFile):

format = "GBR"

format_description = "GIMP brush file"

def _open(self) -> None:

header_size = i32(self.fp.read(4))

if header_size < 20:

msg = "not a GIMP brush"

raise SyntaxError(msg)

version = i32(self.fp.read(4))

if version not in (1, 2):

msg = f"Unsupported GIMP brush version: {version}"

raise SyntaxError(msg)

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:

msg = "not a GIMP brush"

raise SyntaxError(msg)

if color_depth not in (1, 4):

msg = f"Unsupported GIMP brush color depth: {color_depth}"

raise SyntaxError(msg)

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":

msg = "not a GIMP brush, bad magic number"

raise SyntaxError(msg)

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) -> Image.core.PixelAccess | None:

if self._im is None:

self.im = Image.core.new(self.mode, self.size)

self.frombytes(self.fp.read(self._data_size))

return Image.Image.load(self)

#

# registry

Image.register_open(GbrImageFile.format, GbrImageFile, _accept)

Image.register_extension(GbrImageFile.format, ".gbr")