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# -*- coding: utf-8 -*-
# Copyright © 2014 Roberto Alsina and others.
# Permission is hereby granted, free of charge, to any
# person obtaining a copy of this software and associated
# documentation files (the "Software"), to deal in the
# Software without restriction, including without limitation
# the rights to use, copy, modify, merge, publish,
# distribute, sublicense, and/or sell copies of the
# Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice
# shall be included in all copies or substantial portions of
# the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY
# KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
# WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
# PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS
# OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
# OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
# OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
# SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
"""Process images."""
from __future__ import unicode_literals
import datetime
import os
import lxml
import re
import gzip
import piexif
from nikola import utils
Image = None
try:
from PIL import ExifTags, Image # NOQA
except ImportError:
try:
import ExifTags
import Image as _Image
Image = _Image
except ImportError:
pass
EXIF_TAG_NAMES = {}
class ImageProcessor(object):
"""Apply image operations."""
image_ext_list_builtin = ['.jpg', '.png', '.jpeg', '.gif', '.svg', '.svgz', '.bmp', '.tiff']
def _fill_exif_tag_names(self):
"""Connect EXIF tag names to numeric values."""
if not EXIF_TAG_NAMES:
for ifd in piexif.TAGS:
for tag, data in piexif.TAGS[ifd].items():
EXIF_TAG_NAMES[tag] = data['name']
def filter_exif(self, exif, whitelist):
"""Filter EXIF data as described in the documentation."""
# Scenario 1: keep everything
if whitelist == {'*': '*'}:
return exif
# Scenario 2: keep nothing
if whitelist == {}:
return None
# Scenario 3: keep some
self._fill_exif_tag_names()
exif = exif.copy() # Don't modify in-place, it's rude
for k in list(exif.keys()):
if type(exif[k]) != dict:
pass # At least thumbnails have no fields
elif k not in whitelist:
exif.pop(k) # Not whitelisted, remove
elif k in whitelist and whitelist[k] == '*':
# Fully whitelisted, keep all
pass
else:
# Partially whitelisted
for tag in list(exif[k].keys()):
if EXIF_TAG_NAMES[tag] not in whitelist[k]:
exif[k].pop(tag)
return exif or None
def resize_image(self, src, dst, max_size, bigger_panoramas=True, preserve_exif_data=False, exif_whitelist={}):
"""Make a copy of the image in the requested size."""
if not Image or os.path.splitext(src)[1] in ['.svg', '.svgz']:
self.resize_svg(src, dst, max_size, bigger_panoramas)
return
im = Image.open(src)
size = w, h = im.size
if w > max_size or h > max_size:
size = max_size, max_size
# Panoramas get larger thumbnails because they look *awful*
if bigger_panoramas and w > 2 * h:
size = min(w, max_size * 4), min(w, max_size * 4)
try:
exif = piexif.load(im.info["exif"])
except KeyError:
exif = None
# Inside this if, we can manipulate exif as much as
# we want/need and it will be preserved if required
if exif is not None:
# Rotate according to EXIF
value = exif['0th'].get(piexif.ImageIFD.Orientation, 1)
if value in (3, 4):
im = im.transpose(Image.ROTATE_180)
elif value in (5, 6):
im = im.transpose(Image.ROTATE_270)
elif value in (7, 8):
im = im.transpose(Image.ROTATE_90)
if value in (2, 4, 5, 7):
im = im.transpose(Image.FLIP_LEFT_RIGHT)
exif['0th'][piexif.ImageIFD.Orientation] = 1
try:
im.thumbnail(size, Image.ANTIALIAS)
if exif is not None and preserve_exif_data:
# Put right size in EXIF data
w, h = im.size
if '0th' in exif:
exif["0th"][piexif.ImageIFD.ImageWidth] = w
exif["0th"][piexif.ImageIFD.ImageLength] = h
if 'Exif' in exif:
exif["Exif"][piexif.ExifIFD.PixelXDimension] = w
exif["Exif"][piexif.ExifIFD.PixelYDimension] = h
# Filter EXIF data as required
exif = self.filter_exif(exif, exif_whitelist)
im.save(dst, exif=piexif.dump(exif))
else:
im.save(dst)
except Exception as e:
self.logger.warn("Can't process {0}, using original "
"image! ({1})".format(src, e))
utils.copy_file(src, dst)
def resize_svg(self, src, dst, max_size, bigger_panoramas):
"""Make a copy of an svg at the requested size."""
try:
# Resize svg based on viewport hacking.
# note that this can also lead to enlarged svgs
if src.endswith('.svgz'):
with gzip.GzipFile(src, 'rb') as op:
xml = op.read()
else:
with open(src, 'rb') as op:
xml = op.read()
tree = lxml.etree.XML(xml)
width = tree.attrib['width']
height = tree.attrib['height']
w = int(re.search("[0-9]+", width).group(0))
h = int(re.search("[0-9]+", height).group(0))
# calculate new size preserving aspect ratio.
ratio = float(w) / h
# Panoramas get larger thumbnails because they look *awful*
if bigger_panoramas and w > 2 * h:
max_size = max_size * 4
if w > h:
w = max_size
h = max_size / ratio
else:
w = max_size * ratio
h = max_size
w = int(w)
h = int(h)
tree.attrib.pop("width")
tree.attrib.pop("height")
tree.attrib['viewport'] = "0 0 %ipx %ipx" % (w, h)
if dst.endswith('.svgz'):
op = gzip.GzipFile(dst, 'wb')
else:
op = open(dst, 'wb')
op.write(lxml.etree.tostring(tree))
op.close()
except (KeyError, AttributeError) as e:
self.logger.warn("No width/height in %s. Original exception: %s" % (src, e))
utils.copy_file(src, dst)
def image_date(self, src):
"""Try to figure out the date of the image."""
if src not in self.dates:
try:
im = Image.open(src)
exif = im._getexif()
except Exception:
exif = None
if exif is not None:
for tag, value in list(exif.items()):
decoded = ExifTags.TAGS.get(tag, tag)
if decoded in ('DateTimeOriginal', 'DateTimeDigitized'):
try:
if isinstance(value, tuple):
value = value[0]
self.dates[src] = datetime.datetime.strptime(
value, '%Y:%m:%d %H:%M:%S')
break
except ValueError: # Invalid EXIF date.
pass
if src not in self.dates:
self.dates[src] = datetime.datetime.fromtimestamp(
os.stat(src).st_mtime)
return self.dates[src]
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