Merge pull request #1653 from wiredfool/gbr

Fixed long broken GBRImagePlugin
This commit is contained in:
wiredfool 2016-01-31 09:03:03 -08:00
commit 99e88c7796
6 changed files with 54 additions and 20 deletions

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@ -28,6 +28,7 @@ recursive-include Tests *.dds
recursive-include Tests *.doc
recursive-include Tests *.eps
recursive-include Tests *.fli
recursive-include Tests *.gbr
recursive-include Tests *.ggr
recursive-include Tests *.gif
recursive-include Tests *.gpl

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@ -1,17 +1,28 @@
#
# The Python Imaging Library
# $Id$
#
# 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 PIL import Image, ImageFile, _binary
@ -19,7 +30,7 @@ i32 = _binary.i32be
def _accept(prefix):
return len(prefix) >= 8 and i32(prefix) >= 20 and i32(prefix[4:8]) == 1
return len(prefix) >= 8 and i32(prefix[:4]) >= 20 and i32(prefix[4:8]) in (1,2)
##
@ -31,41 +42,53 @@ class GbrImageFile(ImageFile.ImageFile):
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 or version != 1:
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 or color_depth != 1:
if width <= 0 or height <= 0:
raise SyntaxError("not a GIMP brush")
if color_depth not in (1,4):
raise SyntaxError("Unsupported GMP 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(header_size - 20)[:-1]
comment = self.fp.read(comment_length)[:-1]
self.mode = "L"
if color_depth == 1:
self.mode = "L"
else:
self.mode = 'RGBA'
self.size = width, height
self.info["comment"] = comment
# Since the brush is so small, we read the data immediately
self.data = self.fp.read(width * height)
# 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.data:
return
# create an image out of the brush data block
self.im = Image.core.new(self.mode, self.size)
self.im.frombytes(self.data)
self.data = b""
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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@ -1,6 +1,6 @@
from helper import unittest, PillowTestCase
from PIL import GbrImagePlugin
from PIL import Image, GbrImagePlugin
class TestFileGbr(PillowTestCase):
@ -12,6 +12,13 @@ class TestFileGbr(PillowTestCase):
lambda: GbrImagePlugin.GbrImageFile(invalid_file))
def test_gbr_file(self):
im = Image.open('Tests/images/gbr.gbr')
target = Image.open('Tests/images/gbr.png')
self.assert_image_equal(target, im)
if __name__ == '__main__':
unittest.main()

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@ -670,14 +670,17 @@ into account.
GBR
^^^
The GBR decoder reads GIMP brush files.
The GBR decoder reads GIMP brush files, version 1 and 2.
The :py:meth:`~PIL.Image.Image.open` method sets the following
:py:attr:`~PIL.Image.Image.info` properties:
**description**
**comment**
The brush name.
**spacing**
The spacing between the brushes, in pixels. Version 2 only.
GD
^^