285 regels
9.7 KiB
Python
285 regels
9.7 KiB
Python
from django.conf import settings
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import fstools
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import io
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import logging
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import mimetypes
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from ..models import get_item_type, TYPE_IMAGE, TYPE_VIDEO
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import os
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from PIL import Image, ImageEnhance, ExifTags
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import platform
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import pygal
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import subprocess
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# Get a logger instance
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logger = logging.getLogger("CACHING")
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def get_image_class(full_path):
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return {
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TYPE_IMAGE: image,
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TYPE_VIDEO: video,
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}.get(get_item_type(full_path), other)
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def get_image_instance(full_path, request):
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return get_image_class(full_path)(full_path, request)
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class mm_image(object):
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JOIN_TOP_LEFT = 1
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JOIN_TOP_RIGHT = 2
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JOIN_BOT_LEFT = 3
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JOIN_BOT_RIGHT = 4
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JOIN_CENTER = 5
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def __init__(self, imagepath_handle_image):
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self.imagepath_handle_image = imagepath_handle_image
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self.__image__ = None
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#
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def __init_image__(self):
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if self.__image__ is None:
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if type(self.imagepath_handle_image) is mm_image:
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self.__image__ = self.imagepath_handle_image.__image__
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elif type(self.imagepath_handle_image) is Image.Image:
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self.__image__ = self.imagepath_handle_image
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else:
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self.__image__ = Image.open(self.imagepath_handle_image)
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def orientation(self):
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self.__init_image__()
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exif_tags = dict((v, k) for k, v in ExifTags.TAGS.items())
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try:
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return dict(self.__image__._getexif().items())[exif_tags['Orientation']]
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except AttributeError:
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return 1
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except KeyError:
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return 1
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def copy(self):
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self.__init_image__()
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return mm_image(self.__image__.copy())
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def save(self, *args, **kwargs):
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self.__init_image__()
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im = self.__image__.copy().convert('RGB')
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im.save(*args, **kwargs)
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def resize(self, max_size):
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self.__init_image__()
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#
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# resize
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#
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x, y = self.__image__.size
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xy_max = max(x, y)
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self.__image__ = self.__image__.resize((int(x * float(max_size) / xy_max), int(y * float(max_size) / xy_max)), Image.NEAREST).rotate(0)
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def rotate_by_orientation(self, orientation):
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self.__init_image__()
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#
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# rotate
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#
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angle = {3: 180, 6: 270, 8: 90}.get(orientation)
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if angle is not None:
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self.__image__ = self.__image__.rotate(angle, expand=True)
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def __rgba_copy__(self):
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self.__init_image__()
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if self.__image__.mode != 'RGBA':
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return self.__image__.convert('RGBA')
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else:
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return self.__image__.copy()
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def join(self, image, joint_pos=JOIN_TOP_RIGHT, opacity=0.7):
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"""
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This joins another picture to this one.
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:param picture_edit picture: The picture to be joint.
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:param joint_pos: The position of picture in this picture. See also self.JOIN_*
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:param float opacity: The opacity of picture when joint (value between 0 and 1).
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.. note::
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joint_pos makes only sense if picture is smaller than this picture.
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"""
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self.__init_image__()
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#
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im2 = image.__rgba_copy__()
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# change opacity of im2
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alpha = im2.split()[3]
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alpha = ImageEnhance.Brightness(alpha).enhance(opacity)
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im2.putalpha(alpha)
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self.__image__ = self.__rgba_copy__()
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# create a transparent layer
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layer = Image.new('RGBA', self.__image__.size, (0, 0, 0, 0))
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# draw im2 in layer
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if joint_pos == self.JOIN_TOP_LEFT:
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layer.paste(im2, (0, 0))
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elif joint_pos == self.JOIN_TOP_RIGHT:
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layer.paste(im2, ((self.__image__.size[0] - im2.size[0]), 0))
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elif joint_pos == self.JOIN_BOT_LEFT:
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layer.paste(im2, (0, (self.__image__.size[1] - im2.size[1])))
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elif joint_pos == self.JOIN_BOT_RIGHT:
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layer.paste(im2, ((self.__image__.size[0] - im2.size[0]), (self.__image__.size[1] - im2.size[1])))
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elif joint_pos == self.JOIN_CENTER:
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layer.paste(im2, (int((self.__image__.size[0] - im2.size[0]) / 2), int((self.__image__.size[1] - im2.size[1]) / 2)))
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self.__image__ = Image.composite(layer, self.__image__, layer)
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def image_data(self):
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self.__init_image__()
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#
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# create return value
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#
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im = self.__image__.copy().convert('RGB')
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output = io.BytesIO()
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im.save(output, format='JPEG')
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return output.getvalue()
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class mm_video(object):
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def __init__(self, full_path):
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self.full_path = full_path
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def image(self):
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if platform.system() == 'Linux':
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cmd = 'ffmpeg -ss 0.5 -i "' + self.full_path + '" -vframes 1 -f image2pipe pipe:1 2> /dev/null'
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else:
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cmd = 'ffmpeg -ss 0.5 -i "' + self.full_path + '" -vframes 1 -f image2pipe pipe:1 2> NULL'
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data = subprocess.check_output(cmd, shell=True)
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ffmpeg_handle = io.BytesIO(data)
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im = Image.open(ffmpeg_handle)
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return mm_image(im.copy())
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class base_item(object):
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MIME_TYPES = {
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'.ada': 'text/x/adasrc',
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'.hex': 'text/x/hex',
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'.jpg': 'image/x/generic',
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'.jpeg': 'image/x/generic',
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'.jpe': 'image/x/generic',
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'.png': 'image/x/generic',
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'.tif': 'image/x/generic',
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'.tiff': 'image/x/generic',
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'.gif': 'image/x/generic',
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'.avi': 'video/x/generic',
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'.mpg': 'video/x/generic',
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'.mpeg': 'video/x/generic',
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'.mpe': 'video/x/generic',
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'.mov': 'video/x/generic',
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'.qt': 'video/x/generic',
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'.mp4': 'video/x/generic',
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'.webm': 'video/x/generic',
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'.ogv': 'video/x/generic',
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'.flv': 'video/x/generic',
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'.3gp': 'video/x/generic',
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}
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def __init__(self, full_path, request):
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self.full_path = full_path
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self.request = request
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self.rel_path = pygal.get_rel_path(full_path)
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#
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ext = os.path.splitext(self.full_path)[1].lower()
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self.mime_type = self.MIME_TYPES.get(ext, mimetypes.types_map.get(ext, 'unknown'))
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def __cache_image_folder__(self, rel_path):
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return os.path.join(settings.XNAIL_ROOT, rel_path.replace('_', '__').replace('/', '_'))
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def __cache_image_name__(self, max_size):
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filename = '%04d_%02x_%s.jpg' % (max_size, self.XNAIL_VERSION_NUMBER, fstools.uid(self.full_path, None))
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return os.path.join(self.__cache_image_folder__(self.rel_path), filename)
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def __delete_cache_image__(self, max_size):
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for fn in fstools.filelist(self.__cache_image_folder__(self.rel_path), '%04d*' % max_size):
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try:
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os.remove(fn)
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except OSError:
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pass # possibly file is already removed by another process
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class image(base_item, mm_image):
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XNAIL_VERSION_NUMBER = 1
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def __init__(self, *args, **kwargs):
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base_item.__init__(self, *args, **kwargs)
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mm_image.__init__(self, self.full_path)
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self.mime_type_xnails = mimetypes.types_map.get('.jpg', 'unknown')
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def get_resized_image_data(self, max_size):
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cache_filename = self.__cache_image_name__(max_size)
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if not os.path.exists(cache_filename):
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logger.info('Creating xnail-%d for %s', max_size, self.rel_path)
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self.__delete_cache_image__(max_size)
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im = self.copy()
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im.resize(max_size)
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im.rotate_by_orientation(self.orientation())
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#
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# create cache file
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#
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fstools.mkdir(os.path.dirname(cache_filename))
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with open(cache_filename, 'wb') as fh:
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im.save(fh, format='JPEG')
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#
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return im.image_data()
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else:
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return open(cache_filename, 'rb').read()
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def thumbnail_picture(self):
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return self.get_resized_image_data(pygal.get_thumbnail_max_size(self.request))
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def webnail_picture(self):
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return self.get_resized_image_data(pygal.get_webnail_size(self.request))
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class video(base_item, mm_video):
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XNAIL_VERSION_NUMBER = 1
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def __init__(self, *args, **kwargs):
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base_item.__init__(self, *args, **kwargs)
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mm_video.__init__(self, self.full_path)
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self.mime_type_xnails = mimetypes.types_map.get('.jpg', 'unknown')
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def get_resized_image_data(self, max_size):
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cache_filename = self.__cache_image_name__(max_size)
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if not os.path.exists(cache_filename):
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logger.info('Creating xnail-%d for %s', max_size, self.rel_path)
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self.__delete_cache_image__(max_size)
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im = self.image()
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im.resize(max_size)
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overlay = mm_image(os.path.join(os.path.dirname(__file__), 'video.png'))
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im.join(overlay)
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#
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# create cache file
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#
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fstools.mkdir(os.path.dirname(cache_filename))
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with open(cache_filename, 'wb') as fh:
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im.save(fh, format='JPEG')
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#
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return im.image_data()
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else:
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return open(cache_filename, 'rb').read()
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def thumbnail_picture(self):
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return image.thumbnail_picture(self)
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def webnail_picture(self):
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return image.webnail_picture(self)
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class other(base_item):
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def __init__(self, *args, **kwargs):
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base_item.__init__(self, *args, **kwargs)
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self.mime_type_xnails = mimetypes.types_map.get('.png', 'unknown')
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def thumbnail_picture(self):
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fn = os.path.join(os.path.abspath(os.path.dirname(__file__)), 'mimetype_icons', '%s.png' % (self.mime_type).replace('/', '-'))
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if not os.path.exists(fn):
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fn = os.path.join(os.path.abspath(os.path.dirname(__file__)), 'mimetype_icons', 'unknown.png')
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return open(fn, 'rb').read()
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def webnail_picture(self):
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return self.thumbnail_picture()
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