mirror of
https://github.com/Kozea/WeasyPrint.git
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98 lines
3.4 KiB
Python
98 lines
3.4 KiB
Python
# coding: utf8
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"""
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weasyprint.layout.replaced
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--------------------------
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Layout for images and other replaced elements.
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http://dev.w3.org/csswg/css-images-3/#sizing
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:copyright: Copyright 2011-2014 Simon Sapin and contributors, see AUTHORS.
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:license: BSD, see LICENSE for details.
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"""
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from __future__ import division, unicode_literals
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def image_marker_layout(box):
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"""Layout the :class:`boxes.ImageMarkerBox` ``box``.
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:class:`boxes.ImageMarkerBox` objects are :class:`boxes.ReplacedBox`
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objects, but their used size is computed differently.
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"""
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image = box.replacement
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one_em = box.style.font_size
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iwidth, iheight = image.get_intrinsic_size(box.style.image_resolution)
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box.width, box.height = default_image_sizing(
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iwidth, iheight, image.intrinsic_ratio, box.width, box.height,
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default_width=one_em, default_height=one_em)
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def default_image_sizing(intrinsic_width, intrinsic_height, intrinsic_ratio,
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specified_width, specified_height,
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default_width, default_height):
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"""Default sizing algorithm for the concrete object size.
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http://dev.w3.org/csswg/css-images-3/#default-sizing
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Return a ``(concrete_width, concrete_height)`` tuple.
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"""
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if specified_width == 'auto':
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specified_width = None
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if specified_height == 'auto':
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specified_height = None
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if specified_width is not None and specified_height is not None:
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return specified_width, specified_height
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elif specified_width is not None:
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return specified_width, (
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specified_width / intrinsic_ratio if intrinsic_ratio is not None
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else intrinsic_height if intrinsic_height is not None
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else default_height)
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elif specified_height is not None:
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return (
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specified_height * intrinsic_ratio if intrinsic_ratio is not None
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else intrinsic_width if intrinsic_width is not None
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else default_width
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), specified_height
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else:
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return (intrinsic_width if intrinsic_width is not None
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else default_width,
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intrinsic_height if intrinsic_height is not None
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else default_height)
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def contain_constraint_image_sizing(
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constraint_width, constraint_height, intrinsic_ratio):
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"""Cover constraint sizing algorithm for the concrete object size.
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http://dev.w3.org/csswg/css-images-3/#contain-constraint
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Return a ``(concrete_width, concrete_height)`` tuple.
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"""
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return _constraint_image_sizing(
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constraint_width, constraint_height, intrinsic_ratio, cover=False)
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def cover_constraint_image_sizing(
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constraint_width, constraint_height, intrinsic_ratio):
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"""Cover constraint sizing algorithm for the concrete object size.
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http://dev.w3.org/csswg/css-images-3/#cover-constraint
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Return a ``(concrete_width, concrete_height)`` tuple.
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"""
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return _constraint_image_sizing(
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constraint_width, constraint_height, intrinsic_ratio, cover=True)
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def _constraint_image_sizing(
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constraint_width, constraint_height, intrinsic_ratio, cover):
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if intrinsic_ratio is None:
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return constraint_width, constraint_height
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elif cover ^ (constraint_width > constraint_height * intrinsic_ratio):
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return constraint_height * intrinsic_ratio, constraint_height
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else:
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return constraint_width, constraint_width / intrinsic_ratio
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