124 lines
4.1 KiB
Python
124 lines
4.1 KiB
Python
# -*- coding: utf-8 -*-
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#
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# Copyright (c) 2020 - Martin Owens <doctormo@gmail.com>
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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#
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"""
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Image element interface.
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"""
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import os
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import urllib.request as urllib
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import urllib.parse as urlparse
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from base64 import encodebytes
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from ..base import InkscapeExtension
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from ..localization import inkex_gettext as _
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from ._polygons import RectangleBase
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class Image(RectangleBase):
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"""Provide a useful extension for image elements"""
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tag_name = "image"
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@staticmethod
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def _get_type(path, header):
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"""Basic magic header checker, returns mime type"""
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for head, mime in (
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(b"\x89PNG", "image/png"),
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(b"\xff\xd8", "image/jpeg"),
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(b"BM", "image/bmp"),
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(b"GIF87a", "image/gif"),
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(b"GIF89a", "image/gif"),
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(b"MM\x00\x2a", "image/tiff"),
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(b"II\x2a\x00", "image/tiff"),
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):
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if header.startswith(head):
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return mime
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# ico files lack any magic... therefore we check the filename instead
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for ext, mime in (
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# official IANA registered MIME is 'image/vnd.microsoft.icon' tho
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(".ico", "image/x-icon"),
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(".svg", "image/svg+xml"),
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):
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if path.endswith(ext):
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return mime
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return None
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def embed_image(self, file_path: str):
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""" "Embed the data of the selected Image Tag element.
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Relative image paths are interpreted relative to file_path.
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.. versionadded:: 1.5
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Args:
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file_path (str): Relative image paths are interpreted relative to file_path.
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"""
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xlink = self.get("xlink:href")
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if xlink is not None and xlink[:5] == "data:":
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# No need, data already embedded
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return
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if xlink is None:
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raise AttributeError(
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_('Attribute "xlink:href" not set on node {}.'.format(self.get_id()))
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)
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url = urlparse.urlparse(xlink)
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href = urllib.url2pathname(url.path)
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# Look relative to the *temporary* filename instead of the original filename.
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try:
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cwd = os.path.dirname(file_path)
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except TypeError:
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# input_file was actually stdin, fall back.
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cwd = None
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path = InkscapeExtension.absolute_href(href or "", cwd=cwd)
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# Backup directory where we can find the image
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if not os.path.isfile(path):
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path = self.get("sodipodi:absref", path)
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if not os.path.isfile(path):
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raise ValueError(
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_('File not found "{}". Unable to embed image.').format(path)
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)
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return
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with open(path, "rb") as handle:
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# Don't read the whole file to check the header
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file_type = self._get_type(path, handle.read(10))
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handle.seek(0)
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if file_type:
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self.set(
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"xlink:href",
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"data:{};base64,{}".format(
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file_type, encodebytes(handle.read()).decode("ascii")
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),
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)
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self.pop("sodipodi:absref")
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else:
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raise ValueError(
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_(
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"%s is not of type image/png, image/jpeg, "
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"image/bmp, image/gif, image/tiff, or image/x-icon"
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)
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% path
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)
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