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projecten1/lib/python3.6/site-packages/PIL/GbrImagePlugin.py

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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")