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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): | |
| if not self.im: | |
| 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") | |