120 lines
3.6 KiB
Python
120 lines
3.6 KiB
Python
#
|
|
# Copyright (c) 2015 Helmut Merz helmutm@cy55.de
|
|
#
|
|
# This program is free software; you can redistribute it and/or modify
|
|
# it under the terms of the GNU General Public License as published by
|
|
# the Free Software Foundation; either version 2 of the License, or
|
|
# (at your option) any later version.
|
|
#
|
|
# This program is distributed in the hope that it will be useful,
|
|
# but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
# GNU General Public License for more details.
|
|
#
|
|
# You should have received a copy of the GNU General Public License
|
|
# along with this program; if not, write to the Free Software
|
|
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
|
#
|
|
|
|
"""
|
|
Views for displaying media assets.
|
|
|
|
Authors: Johann Schimpf, Erich Seifert.
|
|
"""
|
|
|
|
from logging import getLogger
|
|
try:
|
|
import Image
|
|
except ImportError:
|
|
getLogger('Asset Manager').warn('Python Imaging Library could not be found.')
|
|
|
|
from zope.interface import implements
|
|
|
|
from cybertools.media.interfaces import IMediaAsset, IFileTransform
|
|
from cybertools.storage.filesystem import FileSystemStorage
|
|
|
|
logger = getLogger('cybertools.media.piltransform.PILTransform')
|
|
|
|
|
|
def mimetypeToPIL(mimetype):
|
|
return mimetype.split("/",1)[-1]
|
|
|
|
|
|
class PILTransform(object):
|
|
""" Class for image transformation methods.
|
|
Based on the Python Imaging Library.
|
|
"""
|
|
|
|
implements(IFileTransform)
|
|
|
|
def open(self, path):
|
|
try:
|
|
self.im = Image.open(path)
|
|
except IOError, e:
|
|
logger.warn(e)
|
|
self.im = None
|
|
|
|
def rotate(self, angle, resize):
|
|
if self.im is None:
|
|
return
|
|
self.im = self.im.rotate(angle,Image.BICUBIC)
|
|
|
|
def color(self, mode):
|
|
if self.im is None:
|
|
return
|
|
if not mode:
|
|
return
|
|
mode = mode.upper()
|
|
if mode == "BITMAP":
|
|
mode = "1"
|
|
elif mode == "GRAYSCALE":
|
|
mode = "L"
|
|
self.im = self.im.convert(mode)
|
|
|
|
def crop(self, relWidth, relHeight, alignX=0.5, alignY=0.5):
|
|
if self.im is None:
|
|
return
|
|
alignX = min(max(alignX, 0.0), 1.0)
|
|
alignY = min(max(alignY, 0.0), 1.0)
|
|
w, h = self.im.size
|
|
imgAspect = float(w) / float(h)
|
|
crpAspect = relWidth / relHeight
|
|
if imgAspect >= crpAspect:
|
|
crpWidth = h * crpAspect
|
|
crpHeight = h
|
|
else:
|
|
crpWidth = w
|
|
crpHeight = w / crpAspect
|
|
left = int((w - crpWidth) * alignX)
|
|
upper = int((h - crpHeight) * alignY)
|
|
right = int(left + crpWidth)
|
|
lower = int(upper + crpHeight)
|
|
box = (left, upper, right, lower)
|
|
self.im = self.im.crop(box)
|
|
|
|
def resize(self, width, height=None, fill=False):
|
|
if self.im is None:
|
|
return
|
|
if not height:
|
|
ow, oh = self.im.size
|
|
ratio = float(ow) / float(oh)
|
|
height = int(round(float(width) / ratio))
|
|
dims = (width, height)
|
|
if fill:
|
|
image = self.im
|
|
image.thumbnail(dims, Image.ANTIALIAS)
|
|
new = Image.new('RGBA', dims, (255, 255, 255, 0)) #with alpha
|
|
new.paste(image,((dims[0] - image.size[0]) / 2,
|
|
(dims[1] - image.size[1]) / 2))
|
|
self.im = new
|
|
return new
|
|
return self.im.thumbnail(dims, Image.ANTIALIAS)
|
|
|
|
def save(self, path, mimetype):
|
|
if self.im is None:
|
|
return
|
|
format = mimetypeToPIL(mimetype)
|
|
try:
|
|
self.im.save(path)
|
|
except IOError, e:
|
|
logger.warn(e)
|