52 lines
1.9 KiB
Python
52 lines
1.9 KiB
Python
# This file is part of the Minecraft Overviewer.
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#
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# Minecraft Overviewer is free software: you can redistribute it and/or
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# modify it under the terms of the GNU General Public License as published
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# by the Free Software Foundation, either version 3 of the License, or (at
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# your option) any later version.
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#
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# Minecraft Overviewer 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 GNU General
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# 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 along
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# with the Overviewer. If not, see <http://www.gnu.org/licenses/>.
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import logging
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from PIL import Image
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"""
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This module has an alpha-over function that is used throughout
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Overviewer. It defaults to the PIL paste function when the custom
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alpha-over extension cannot be found.
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"""
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extension_alpha_over = None
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try:
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from _composite import alpha_over as _extension_alpha_over
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extension_alpha_over = _extension_alpha_over
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except ImportError:
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pass
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def alpha_over(dest, src, pos_or_rect=(0, 0), mask=None):
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"""Composite src over dest, using mask as the alpha channel (if
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given), otherwise using src's alpha channel. pos_or_rect can
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either be a position or a rectangle, specifying where on dest to
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put src. Falls back to dest.paste() if the alpha_over extension
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can't be found."""
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if mask == None:
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mask = src
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global extension_alpha_over
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if extension_alpha_over != None:
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# extension ALWAYS expects rects, so convert if needed
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if len(pos_or_rect) == 2:
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pos_or_rect = (pos_or_rect[0], pos_or_rect[1], src.size[0], src.size[1])
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extension_alpha_over(dest, src, pos_or_rect, mask)
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else:
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# fallback
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dest.paste(src, pos_or_rect, mask)
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