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https://github.com/gryf/pygtktalog.git
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* Created separate module for Thumbnail class.
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197
src/utils/thumbnail.py
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197
src/utils/thumbnail.py
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# This Python file uses the following encoding: utf-8
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#
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# Author: Roman 'gryf' Dobosz gryf@elysium.pl
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#
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# Copyright (C) 2007 by Roman 'gryf' Dobosz
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#
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# This file is part of pyGTKtalog.
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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 General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (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 General 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
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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# -------------------------------------------------------------------------
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from tempfile import gettempdir
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from shutil import move
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from os import path, mkdir
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from datetime import datetime
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import EXIF
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import Image
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class Thumbnail(object):
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def __init__(self, filename=None, x=160, y=160, root='thumbnails', base=''):
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self.root = root
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self.x = x
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self.y = y
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self.filename = filename
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self.base = base
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def save(self, image_id):
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"""Save thumbnail into specific directory structure
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return full path to the file and exif object or None"""
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filepath = path.join(self.base, self.__get_and_make_path(image_id))
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f = open(self.filename, 'rb')
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exif = None
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returncode = -1
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try:
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exif = EXIF.process_file(f)
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f.close()
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if exif.has_key('JPEGThumbnail'):
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thumbnail = exif['JPEGThumbnail']
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f = open(filepath,'wb')
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f.write(thumbnail)
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f.close()
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if exif.has_key('Image Orientation'):
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orientation = exif['Image Orientation'].values[0]
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if orientation > 1:
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t = path.join(gettempdir(), "thumb%d.jpg" % datetime.now().microsecond)
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im_in = Image.open(filepath)
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im_out = None
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if orientation == 8:
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# Rotated 90 CCW
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im_out = im_in.transpose(Image.ROTATE_90)
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elif orientation == 6:
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# Rotated 90 CW
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im_out = im_in.transpose(Image.ROTATE_270)
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elif orientation == 3:
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# Rotated 180
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im_out = im_in.transpose(Image.ROTATE_180)
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elif orientation == 2:
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# Mirrored horizontal
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im_out = im_in.transpose(Image.FLIP_LEFT_RIGHT)
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elif orientation == 4:
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# Mirrored vertical
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im_out = im_in.transpose(Image.FLIP_TOP_BOTTOM)
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elif orientation == 5:
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# Mirrored horizontal then rotated 90 CCW
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im_out = im_in.transpose(Image.FLIP_LEFT_RIGHT).transpose(Image.ROTATE_90)
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elif orientation == 7:
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# Mirrored horizontal then rotated 90 CW
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im_out = im_in.transpose(Image.FLIP_LEFT_RIGHT).transpose(Image.ROTATE_270)
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if im_out:
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im_out.save(t, 'JPEG')
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move(t, filepath)
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else:
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f.close()
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returncode = 0
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else:
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im = self.__scale_image()
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if im:
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im.save(filepath, "JPEG")
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returncode = 1
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except:
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f.close()
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im = self.__scale_image()
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if im:
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im.save(filepath, "JPEG")
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returncode = 2
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return filepath, exif, returncode
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# private class functions
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def __get_and_make_path(self, img_id):
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"""Make directory structure regards of id
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and return filepath WITHOUT extension"""
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t = path.join(self.base, self.root)
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try: mkdir(t)
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except: pass
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h = hex(img_id)
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if len(h[2:])>6:
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try: mkdir(path.join(t, h[2:4]))
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except: pass
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try: mkdir(path.join(t, h[2:4], h[4:6]))
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except: pass
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fpath = path.join(t, h[2:4], h[4:6], h[6:8])
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try: mkdir(fpath)
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except: pass
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img = "%s.%s" % (h[8:], 'jpg')
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elif len(h[2:])>4:
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try: mkdir(path.join(t, h[2:4]))
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except: pass
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fpath = path.join(t, h[2:4], h[4:6])
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try: mkdir(fpath)
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except: pass
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img = "%s.%s" % (h[6:], 'jpg')
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elif len(h[2:])>2:
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fpath = path.join(t, h[2:4])
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try: mkdir(fpath)
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except: pass
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img = "%s.%s" %(h[4:], 'jpg')
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else:
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fpath = ''
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img = "%s.%s" %(h[2:], 'jpg')
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return(path.join(t, fpath, img))
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def __scale_image(self, factor=True):
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"""create thumbnail. returns image object or None"""
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try:
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im = Image.open(self.filename).convert('RGB')
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except:
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return None
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im.thumbnail((self.x, self.y), Image.ANTIALIAS)
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return im
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def __scale_image_deprecated(self, factor=True):
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"""generate scaled Image object for given file
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args:
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factor - if False, adjust height into self.y
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if True, use self.x for scale portrait pictures height.
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returns Image object, or None
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"""
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try:
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im = Image.open(self.filename).convert('RGB')
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except:
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return None
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x, y = im.size
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if x > self.x or y > self.y:
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if x==y:
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# square
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imt = im.resize((self.y, self.y), Image.ANTIALIAS)
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elif x > y:
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# landscape
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if int(y/(x/float(self.x))) > self.y:
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# landscape image: height is non standard
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self.x1 = int(float(self.y) * self.y / self.x)
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if float(self.y) * self.y / self.x - self.x1 > 0.49:
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self.x1 += 1
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imt = im.resize(((int(x/(y/float(self.y))),self.y)),Image.ANTIALIAS)
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elif x/self.x==y/self.y:
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# aspect ratio ok
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imt = im.resize((self.x, self.y), Image.ANTIALIAS)
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else:
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imt = im.resize((self.x,int(y/(x/float(self.x)))), 1)
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else:
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# portrait
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if factor:
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if y>self.x:
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imt = im.resize(((int(x/(y/float(self.x))),self.x)),Image.ANTIALIAS)
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else:
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imt = im
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else:
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self.x1 = int(float(self.y) * self.y / self.x)
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if float(self.y) * self.y / self.x - self.x1 > 0.49:
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self.x1 += 1
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if x/self.x1==y/self.y:
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# aspect ratio ok
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imt = im.resize((self.x1,self.y),Image.ANTIALIAS)
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else:
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imt = im.resize(((int(x/(y/float(self.y))),self.y)),Image.ANTIALIAS)
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return imt
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else:
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return im
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