forked from CGM_Public/pretix_original
103 lines
4.1 KiB
Python
103 lines
4.1 KiB
Python
#
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# This file is part of pretix (Community Edition).
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#
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# Copyright (C) 2014-2020 Raphael Michel and contributors
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# Copyright (C) 2020-2021 rami.io GmbH and contributors
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#
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# This program is free software: you can redistribute it and/or modify it under the terms of the GNU Affero General
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# Public License as published by the Free Software Foundation in version 3 of the License.
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#
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# ADDITIONAL TERMS APPLY: Pursuant to Section 7 of the GNU Affero General Public License, additional terms are
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# applicable granting you additional permissions and placing additional restrictions on your usage of this software.
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# Please refer to the pretix LICENSE file to obtain the full terms applicable to this work. If you did not receive
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# this file, see <https://pretix.eu/about/en/license>.
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#
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# This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied
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# warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License for more
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# details.
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#
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# You should have received a copy of the GNU Affero General Public License along with this program. If not, see
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# <https://www.gnu.org/licenses/>.
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#
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import logging
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from arabic_reshaper import ArabicReshaper
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from django.conf import settings
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from django.utils.functional import SimpleLazyObject
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from PIL import Image
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from reportlab.lib.styles import ParagraphStyle
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from reportlab.lib.utils import ImageReader
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from reportlab.pdfbase import pdfmetrics
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from reportlab.platypus import Paragraph
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from pretix.presale.style import get_fonts
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logger = logging.getLogger(__name__)
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class ThumbnailingImageReader(ImageReader):
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def resize(self, width, height, dpi):
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if width is None:
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width = height * self._image.size[0] / self._image.size[1]
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if height is None:
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height = width * self._image.size[1] / self._image.size[0]
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self._image.thumbnail(
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size=(int(width * dpi / 72), int(height * dpi / 72)),
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resample=Image.Resampling.BICUBIC
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)
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self._data = None
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return width, height
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def remove_transparency(self, background_color="WHITE"):
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if "A" in self._image.mode:
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new_image = Image.new("RGBA", self._image.size, background_color)
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new_image.paste(self._image, mask=self._image)
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self._image = new_image.convert("RGB")
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def _jpeg_fh(self):
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# Bypass a reportlab-internal optimization that falls back to the original
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# file handle if the file is a JPEG, and therefore does not respect the
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# (smaller) size of the modified image.
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return None
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def _read_image(self, fp):
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return Image.open(fp, formats=settings.PILLOW_FORMATS_IMAGE)
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reshaper = SimpleLazyObject(lambda: ArabicReshaper(configuration={
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'delete_harakat': True,
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'support_ligatures': False,
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}))
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class FontFallbackParagraph(Paragraph):
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def __init__(self, text, style=None, *args, **kwargs):
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if style is None:
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style = ParagraphStyle(name='paragraphImplicitDefaultStyle')
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if not self._font_supports_text(text, style.fontName):
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newFont = self._find_font(text, style.fontName)
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if newFont:
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logger.debug(f"replacing {style.fontName} with {newFont} for {text!r}")
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style = style.clone(name=style.name + '_' + newFont, fontName=newFont)
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super().__init__(text, style, *args, **kwargs)
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def _font_supports_text(self, text, font_name):
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if not text:
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return True
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font = pdfmetrics.getFont(font_name)
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return all(
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ord(c) in font.face.charToGlyph or not c.isprintable()
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for c in text
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)
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def _find_font(self, text, original_font):
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for family, styles in get_fonts(pdf_support_required=True).items():
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if self._font_supports_text(text, family):
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if (original_font.endswith("It") or original_font.endswith(" I")) and "italic" in styles:
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return family + " I"
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if (original_font.endswith("Bd") or original_font.endswith(" B")) and "bold" in styles:
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return family + " B"
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return family
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