104 lines
2.9 KiB
Python
104 lines
2.9 KiB
Python
#
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# The Python Imaging Library
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#
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# load a GIMP brush file
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#
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# History:
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# 96-03-14 fl Created
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# 16-01-08 es Version 2
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#
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# Copyright (c) Secret Labs AB 1997.
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# Copyright (c) Fredrik Lundh 1996.
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# Copyright (c) Eric Soroos 2016.
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#
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# See the README file for information on usage and redistribution.
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#
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#
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# See https://github.com/GNOME/gimp/blob/mainline/devel-docs/gbr.txt for
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# format documentation.
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#
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# This code Interprets version 1 and 2 .gbr files.
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# Version 1 files are obsolete, and should not be used for new
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# brushes.
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# Version 2 files are saved by GIMP v2.8 (at least)
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# Version 3 files have a format specifier of 18 for 16bit floats in
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# the color depth field. This is currently unsupported by Pillow.
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from __future__ import annotations
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from . import Image, ImageFile
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from ._binary import i32be as i32
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def _accept(prefix: bytes) -> bool:
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return len(prefix) >= 8 and i32(prefix, 0) >= 20 and i32(prefix, 4) in (1, 2)
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##
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# Image plugin for the GIMP brush format.
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class GbrImageFile(ImageFile.ImageFile):
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format = "GBR"
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format_description = "GIMP brush file"
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def _open(self) -> None:
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header_size = i32(self.fp.read(4))
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if header_size < 20:
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msg = "not a GIMP brush"
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raise SyntaxError(msg)
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version = i32(self.fp.read(4))
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if version not in (1, 2):
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msg = f"Unsupported GIMP brush version: {version}"
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raise SyntaxError(msg)
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width = i32(self.fp.read(4))
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height = i32(self.fp.read(4))
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color_depth = i32(self.fp.read(4))
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if width <= 0 or height <= 0:
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msg = "not a GIMP brush"
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raise SyntaxError(msg)
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if color_depth not in (1, 4):
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msg = f"Unsupported GIMP brush color depth: {color_depth}"
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raise SyntaxError(msg)
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if version == 1:
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comment_length = header_size - 20
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else:
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comment_length = header_size - 28
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magic_number = self.fp.read(4)
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if magic_number != b"GIMP":
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msg = "not a GIMP brush, bad magic number"
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raise SyntaxError(msg)
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self.info["spacing"] = i32(self.fp.read(4))
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comment = self.fp.read(comment_length)[:-1]
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if color_depth == 1:
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self._mode = "L"
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else:
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self._mode = "RGBA"
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self._size = width, height
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self.info["comment"] = comment
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# Image might not be small
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Image._decompression_bomb_check(self.size)
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# Data is an uncompressed block of w * h * bytes/pixel
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self._data_size = width * height * color_depth
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def load(self):
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if not self.im:
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self.im = Image.core.new(self.mode, self.size)
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self.frombytes(self.fp.read(self._data_size))
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return Image.Image.load(self)
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#
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# registry
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Image.register_open(GbrImageFile.format, GbrImageFile, _accept)
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Image.register_extension(GbrImageFile.format, ".gbr")
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