2011-05-25 17:54:46 +04:00
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# coding: utf8
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# WeasyPrint converts web documents (HTML, CSS, ...) to PDF.
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# Copyright (C) 2011 Simon Sapin
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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 Affero General Public License as
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# published by the Free Software Foundation, either version 3 of the
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# License, or (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 Affero General Public License for more details.
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#
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# You should have received a copy of the GNU Affero General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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"""
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2011-08-19 18:52:46 +04:00
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Classes and helpers for HTML replaced elements.
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2011-05-25 17:54:46 +04:00
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Replaced elements (eg. <img> elements) are rendered externally and behave
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as an atomic opaque box in CSS. They may or may not have intrinsic dimensions.
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2011-08-19 18:52:46 +04:00
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2011-05-25 17:54:46 +04:00
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"""
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2011-08-09 12:15:53 +04:00
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from __future__ import division
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2011-08-10 16:51:18 +04:00
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2011-08-09 12:15:53 +04:00
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import cairo
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2011-08-10 16:51:18 +04:00
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2011-08-09 12:15:53 +04:00
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from .utils import get_url_attribute
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2011-08-10 16:51:18 +04:00
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from .draw.helpers import get_image_surface_from_uri
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2011-05-25 17:54:46 +04:00
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def get_replaced_element(element):
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"""Return a :class:`Replacement` object if ``element`` is replaced."""
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2011-05-25 17:54:46 +04:00
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# TODO: maybe allow registering new replaced elements
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if element.tag == 'img':
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return ImageReplacement(element)
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class Replacement(object):
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"""Abstract base class for replaced elements. """
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def __init__(self, element):
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self.element = element
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2011-08-09 12:15:53 +04:00
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def intrinsic_width(self):
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"""Intrinsic width if defined."""
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def intrinsic_height(self):
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"""Intrinsic height if defined."""
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def intrinsic_ratio(self):
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"""Intrinsic ratio if defined."""
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if (self.intrinsic_width() is not None and
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self.intrinsic_width() != 0 and
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self.intrinsic_height() is not None and
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self.intrinsic_height() != 0):
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return self.intrinsic_width() / self.intrinsic_height()
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2011-05-25 17:54:46 +04:00
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2011-08-19 18:52:46 +04:00
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2011-05-25 17:54:46 +04:00
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class ImageReplacement(Replacement):
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"""Replaced ``<img>`` element."""
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def __init__(self, element):
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super(ImageReplacement, self).__init__(element)
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self.src = get_url_attribute(element, 'src')
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self.alt_text = element.get('alt')
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2011-08-10 16:51:18 +04:00
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self.surface = get_image_surface_from_uri(self.src)
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2011-08-19 12:39:31 +04:00
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# TODO: if surface is None, use alt attribute
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def intrinsic_width(self):
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if self.surface:
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return self.surface.get_width()
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def intrinsic_height(self):
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if self.surface:
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return self.surface.get_height()
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def draw(self, context):
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"""Draw the element on the Cairo context."""
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pattern = cairo.SurfacePattern(self.surface)
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context.set_source(pattern)
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context.paint()
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