def create_thumbnail(image_url, thumb_path, thumb_url, width, height, filetype, quality=95):
try:
thumb_exists = is_file_exists(thumb_path, thumb_url)
except UnicodeEncodeError:
from mezzanine.core.exceptions import FileSystemEncodingChanged
raise FileSystemEncodingChanged()
if thumb_exists:
return thumb_url
if settings.S3_URL:
f = StringIO.StringIO()
get_s3_content(image_url, f)
f.seek(0)
else:
try:
f = default_storage.open(image_url)
except:
return image_url
try:
image = Image.open(f)
except:
return image_url
image_info = image.info
width = int(width)
height = int(height)
if width == image.size[0] and height == image.size[1]:
return image_url
if width == 0:
width = image.size[0] * height / image.size[1]
elif height == 0:
height = image.size[1] * width / image.size[0]
if image.mode not in ("P", "L", "RGBA"):
image = image.convert("RGBA")
# Required for progressive jpgs.
ImageFile.MAXBLOCK = image.size[0] * image.size[1]
try:
image = ImageOps.fit(image, (width, height), Image.ANTIALIAS)
if settings.S3_URL:
thumb_f = StringIO.StringIO()
image.save(thumb_f, filetype, quality=quality, **image_info)
upload_to_s3(thumb_url, string_io=thumb_f)
else:
image = image.save(thumb_path, filetype, quality=quality, **image_info)
except Exception:
try:
os.remove(thumb_path)
except Exception:
pass
return image_url
return thumb_url
def is_empty(self):
if self.is_folder:
try:
dirs, files = default_storage.listdir(self.name)
except UnicodeDecodeError:
from mezzanine.core.exceptions import FileSystemEncodingChanged
raise FileSystemEncodingChanged()
if not dirs and not files:
return True
return False
def thumbnail(image_url,
width,
height,
upscale=True,
quality=95,
left=.5,
top=.5,
padding=False,
padding_color="#fff"):
"""
Given the URL to an image, resizes the image using the given width
and height on the first time it is requested, and returns the URL
to the new resized image. If width or height are zero then original
ratio is maintained. When ``upscale`` is False, images smaller than
the given size will not be grown to fill that size. The given width
and height thus act as maximum dimensions.
"""
if not image_url:
return ""
try:
from PIL import Image, ImageFile, ImageOps
except ImportError:
return ""
image_url = unquote(str(image_url)).split("?")[0]
if image_url.startswith(settings.MEDIA_URL):
image_url = image_url.replace(settings.MEDIA_URL, "", 1)
image_dir, image_name = os.path.split(image_url)
image_prefix, image_ext = os.path.splitext(image_name)
filetype = {".png": "PNG", ".gif": "GIF"}.get(image_ext, "JPEG")
thumb_name = "%s-%sx%s" % (image_prefix, width, height)
if not upscale:
thumb_name += "-no-upscale"
if left != .5 or top != .5:
left = min(1, max(0, left))
top = min(1, max(0, top))
thumb_name = "%s-%sx%s" % (thumb_name, left, top)
thumb_name += "-padded-%s" % padding_color if padding else ""
thumb_name = "%s%s" % (thumb_name, image_ext)
# `image_name` is used here for the directory path, as each image
# requires its own sub-directory using its own name - this is so
# we can consistently delete all thumbnails for an individual
# image, which is something we do in filebrowser when a new image
# is written, allowing us to purge any previously generated
# thumbnails that may match a new image name.
thumb_dir = os.path.join(settings.MEDIA_ROOT, image_dir,
settings.THUMBNAILS_DIR_NAME, image_name)
if not os.path.exists(thumb_dir):
try:
os.makedirs(thumb_dir)
except OSError:
pass
thumb_path = os.path.join(thumb_dir, thumb_name)
thumb_url = "%s/%s/%s" % (settings.THUMBNAILS_DIR_NAME,
quote(image_name.encode("utf-8")),
quote(thumb_name.encode("utf-8")))
image_url_path = os.path.dirname(image_url)
if image_url_path:
thumb_url = "%s/%s" % (image_url_path, thumb_url)
# The original tag returns a local image_url, but when you're using
# S3 you want to return the remote url. Here, we construct that URL.
terms = filter(
None,
[
settings.MEDIA_URL.strip("/"),
# settings.AWS_LOCATION, # this might be an empty string, hence filter()
thumb_url,
])
remote_url = "/".join(terms)
try:
thumb_exists = os.path.exists(thumb_path)
except UnicodeEncodeError:
# The image that was saved to a filesystem with utf-8 support,
# but somehow the locale has changed and the filesystem does not
# support utf-8.
from mezzanine.core.exceptions import FileSystemEncodingChanged
raise FileSystemEncodingChanged()
if thumb_exists:
# Thumbnail exists, don't generate it.
if settings.DEBUG:
print("thumb_exists codepath")
return remote_url
elif not default_storage.exists(image_url):
# Requested image does not exist, just return its URL.
if settings.DEBUG:
print("not default_storage.exists(image_url) codepath")
return remote_url
if settings.DEBUG:
print("opening image url:", image_url)
f = default_storage.open(image_url)
try:
image = Image.open(f)
except:
# Invalid image format.
return remote_url
image_info = image.info
# Transpose to align the image to its orientation if necessary.
# If the image is transposed, delete the exif information as
# not all browsers support the CSS image-orientation:
# - http://caniuse.com/#feat=css-image-orientation
try:
orientation = image._getexif().get(0x0112)
except:
orientation = None
if orientation:
methods = {
2: (Image.FLIP_LEFT_RIGHT, ),
3: (Image.ROTATE_180, ),
4: (Image.FLIP_TOP_BOTTOM, ),
5: (Image.FLIP_LEFT_RIGHT, Image.ROTATE_90),
6: (Image.ROTATE_270, ),
7: (Image.FLIP_LEFT_RIGHT, Image.ROTATE_270),
8: (Image.ROTATE_90, )
}.get(orientation, ())
if methods:
image_info.pop('exif', None)
for method in methods:
image = image.transpose(method)
to_width = int(width)
to_height = int(height)
from_width = image.size[0]
from_height = image.size[1]
if not upscale:
to_width = min(to_width, from_width)
to_height = min(to_height, from_height)
# Set dimensions.
if to_width == 0:
to_width = from_width * to_height // from_height
elif to_height == 0:
to_height = from_height * to_width // from_width
if image.mode not in ("P", "L", "RGBA"):
try:
image = image.convert("RGBA")
except:
return remote_url
# Required for progressive jpgs.
ImageFile.MAXBLOCK = 2 * (max(image.size)**2)
# Padding.
if padding and to_width and to_height:
from_ratio = float(from_width) / from_height
to_ratio = float(to_width) / to_height
pad_size = None
if to_ratio < from_ratio:
pad_height = int(to_height * (float(from_width) / to_width))
pad_size = (from_width, pad_height)
pad_top = (pad_height - from_height) // 2
pad_left = 0
elif to_ratio > from_ratio:
pad_width = int(to_width * (float(from_height) / to_height))
pad_size = (pad_width, from_height)
pad_top = 0
pad_left = (pad_width - from_width) // 2
if pad_size is not None:
pad_container = Image.new("RGBA", pad_size, padding_color)
pad_container.paste(image, (pad_left, pad_top))
image = pad_container
# Create the thumbnail.
to_size = (to_width, to_height)
to_pos = (left, top)
try:
image = ImageOps.fit(image, to_size, Image.ANTIALIAS, 0, to_pos)
image = image.save(thumb_path, filetype, quality=quality, **image_info)
# Push a remote copy of the thumbnail if MEDIA_URL is
# absolute.
if "://" in settings.MEDIA_URL:
with open(thumb_path, "rb") as f:
default_storage.save(unquote(thumb_url), File(f))
if settings.DEBUG:
print("wrote thumb_url to disk:", thumb_url)
except Exception:
# If an error occurred, a corrupted image may have been saved,
# so remove it, otherwise the check for it existing will just
# return the corrupted image next time it's requested.
try:
os.remove(thumb_path)
except Exception:
pass
if settings.DEBUG:
print("thumbnail writing exception")
return remote_url
if settings.DEBUG:
print("using final remote_url:", remote_url)
return remote_url
def thumbnail(image_url, width, height, quality=95):
"""
Given the URL to an image, resizes the image using the given width and
height on the first time it is requested, and returns the URL to the new
resized image. if width or height are zero then original ratio is
maintained.
"""
if not image_url:
return ""
image_url = unquote(unicode(image_url))
if image_url.startswith(settings.MEDIA_URL):
image_url = image_url.replace(settings.MEDIA_URL, "", 1)
image_dir, image_name = os.path.split(image_url)
image_prefix, image_ext = os.path.splitext(image_name)
filetype = {".png": "PNG", ".gif": "GIF"}.get(image_ext, "JPEG")
thumb_name = "%s-%sx%s%s" % (image_prefix, width, height, image_ext)
thumb_dir = os.path.join(settings.MEDIA_ROOT, image_dir,
settings.THUMBNAILS_DIR_NAME)
if not os.path.exists(thumb_dir):
os.makedirs(thumb_dir)
thumb_path = os.path.join(thumb_dir, thumb_name)
thumb_url = "%s/%s" % (settings.THUMBNAILS_DIR_NAME,
quote(thumb_name.encode("utf-8")))
image_url_path = os.path.dirname(image_url)
if image_url_path:
thumb_url = "%s/%s" % (image_url_path, thumb_url)
try:
thumb_exists = os.path.exists(thumb_path)
except UnicodeEncodeError:
# The image that was saved to a filesystem with utf-8 support,
# but somehow the locale has changed and the filesystem does not
# support utf-8.
from mezzanine.core.exceptions import FileSystemEncodingChanged
raise FileSystemEncodingChanged()
if thumb_exists:
# Thumbnail exists, don't generate it.
return thumb_url
elif not default_storage.exists(image_url):
# Requested image does not exist, just return its URL.
return image_url
f = default_storage.open(image_url)
try:
image = Image.open(f)
except:
# Invalid image format
return image_url
image_info = image.info
width = int(width)
height = int(height)
# If already right size, don't do anything.
if width == image.size[0] and height == image.size[1]:
return image_url
# Set dimensions.
if width == 0:
width = image.size[0] * height / image.size[1]
elif height == 0:
height = image.size[1] * width / image.size[0]
if image.mode not in ("L", "RGBA"):
image = image.convert("RGBA")
# Required for progressive jpgs.
ImageFile.MAXBLOCK = image.size[0] * image.size[1]
try:
image = ImageOps.fit(image, (width, height), Image.ANTIALIAS)
image = image.save(thumb_path, filetype, quality=quality, **image_info)
# Push a remote copy of the thumbnail if MEDIA_URL is
# absolute.
if "://" in settings.MEDIA_URL:
with open(thumb_path, "r") as f:
default_storage.save(thumb_url, File(f))
except Exception:
# If an error occurred, a corrupted image may have been saved,
# so remove it, otherwise the check for it existing will just
# return the corrupted image next time it's requested.
try:
os.remove(thumb_path)
except Exception:
pass
return image_url
return thumb_url
def thumbnail(image_url,
width,
height,
quality=95,
left=.5,
top=.5,
padding=False,
padding_color="#fff"):
"""
Given the URL to an image, resizes the image using the given width and
height on the first time it is requested, and returns the URL to the new
resized image. if width or height are zero then original ratio is
maintained.
"""
if not image_url:
return ""
try:
from PIL import Image, ImageFile, ImageOps
except ImportError:
return ""
image_url = unquote(str(image_url)).split("?")[0]
if image_url.startswith(settings.MEDIA_URL):
image_url = image_url.replace(settings.MEDIA_URL, "", 1)
image_dir, image_name = os.path.split(image_url)
image_prefix, image_ext = os.path.splitext(image_name)
filetype = {".png": "PNG", ".gif": "GIF"}.get(image_ext, "JPEG")
thumb_name = "%s-%sx%s" % (image_prefix, width, height)
if left != .5 or top != .5:
left = min(1, max(0, left))
top = min(1, max(0, top))
thumb_name = "%s-%sx%s" % (thumb_name, left, top)
thumb_name += "-padded-%s" % padding_color if padding else ""
thumb_name = "%s%s" % (thumb_name, image_ext)
# `image_name` is used here for the directory path, as each image
# requires its own sub-directory using its own name - this is so
# we can consistently delete all thumbnails for an individual
# image, which is something we do in filebrowser when a new image
# is written, allowing us to purge any previously generated
# thumbnails that may match a new image name.
thumb_dir = os.path.join(settings.MEDIA_ROOT, image_dir,
settings.THUMBNAILS_DIR_NAME, image_name)
if not os.path.exists(thumb_dir):
os.makedirs(thumb_dir)
thumb_path = os.path.join(thumb_dir, thumb_name)
thumb_url = "%s/%s/%s" % (settings.THUMBNAILS_DIR_NAME,
quote(image_name.encode("utf-8")),
quote(thumb_name.encode("utf-8")))
image_url_path = os.path.dirname(image_url)
if image_url_path:
thumb_url = "%s/%s" % (image_url_path, thumb_url)
try:
thumb_exists = os.path.exists(thumb_path)
except UnicodeEncodeError:
# The image that was saved to a filesystem with utf-8 support,
# but somehow the locale has changed and the filesystem does not
# support utf-8.
from mezzanine.core.exceptions import FileSystemEncodingChanged
raise FileSystemEncodingChanged()
if thumb_exists:
# Thumbnail exists, don't generate it.
return thumb_url
elif not default_storage.exists(image_url):
# Requested image does not exist, just return its URL.
return image_url
f = default_storage.open(image_url)
try:
image = Image.open(f)
except:
# Invalid image format.
return image_url
image_info = image.info
to_width = int(width)
to_height = int(height)
from_width = image.size[0]
from_height = image.size[1]
# If already right size, don't do anything.
if to_width == from_width and to_height == from_height:
return image_url
# Set dimensions.
if to_width == 0:
to_width = from_width * to_height // from_height
elif to_height == 0:
to_height = from_height * to_width // from_width
if image.mode not in ("P", "L", "RGBA"):
try:
image = image.convert("RGBA")
except:
return image_url
# Required for progressive jpgs.
ImageFile.MAXBLOCK = 2 * (max(image.size)**2)
# Padding.
if padding and to_width and to_height:
from_ratio = float(from_width) / from_height
to_ratio = float(to_width) / to_height
pad_size = None
if to_ratio < from_ratio:
pad_height = int(to_height * (float(from_width) / to_width))
pad_size = (from_width, pad_height)
pad_top = (pad_height - from_height) // 2
pad_left = 0
elif to_ratio > from_ratio:
pad_width = int(to_width * (float(from_height) / to_height))
pad_size = (pad_width, from_height)
pad_top = 0
pad_left = (pad_width - from_width) // 2
if pad_size is not None:
pad_container = Image.new("RGBA", pad_size, padding_color)
pad_container.paste(image, (pad_left, pad_top))
image = pad_container
# Create the thumbnail.
to_size = (to_width, to_height)
to_pos = (left, top)
try:
image = ImageOps.fit(image, to_size, Image.ANTIALIAS, 0, to_pos)
image = image.save(thumb_path, filetype, quality=quality, **image_info)
# Push a remote copy of the thumbnail if MEDIA_URL is
# absolute.
if "://" in settings.MEDIA_URL:
with open(thumb_path, "rb") as f:
default_storage.save(thumb_url, File(f))
except Exception:
# If an error occurred, a corrupted image may have been saved,
# so remove it, otherwise the check for it existing will just
# return the corrupted image next time it's requested.
try:
os.remove(thumb_path)
except Exception:
pass
return image_url
return thumb_url
def plei_thumbnail(image_url, width, height, quality=95):
"""
Given the URL to an image, resizes the image using the given width and
height on the first time it is requested, and returns the URL to the new
resized image.
Aspect ratio is always preserved - so, if width/height do not match original aspect ratio,
the image will be resized so that one side is equal to the target dimention, and the other will be larger.
This is useful for cases when we need to fill a rectangle with a resized image,
and the source images have unpredictable aspect ratio.
"""
if not image_url:
return ""
image_url = unquote(unicode(image_url))
if image_url.startswith(settings.MEDIA_URL):
image_url = image_url.replace(settings.MEDIA_URL, "", 1)
image_dir, image_name = os.path.split(image_url)
image_prefix, image_ext = os.path.splitext(image_name)
filetype = {".png": "PNG", ".gif": "GIF"}.get(image_ext, "JPEG")
thumb_name = "%s-ar-%sx%s%s" % (image_prefix, width, height, image_ext)
thumb_dir = os.path.join(settings.MEDIA_ROOT, image_dir,
settings.THUMBNAILS_DIR_NAME)
if not os.path.exists(thumb_dir):
os.makedirs(thumb_dir)
thumb_path = os.path.join(thumb_dir, thumb_name)
thumb_url = "%s/%s" % (settings.THUMBNAILS_DIR_NAME,
quote(thumb_name.encode("utf-8")))
image_url_path = os.path.dirname(image_url)
if image_url_path:
thumb_url = "%s/%s" % (image_url_path, thumb_url)
try:
thumb_exists = os.path.exists(thumb_path)
except UnicodeEncodeError:
# The image that was saved to a filesystem with utf-8 support,
# but somehow the locale has changed and the filesystem does not
# support utf-8.
from mezzanine.core.exceptions import FileSystemEncodingChanged
raise FileSystemEncodingChanged()
if thumb_exists:
# Thumbnail exists, don't generate it.
return thumb_url
elif not default_storage.exists(image_url):
# Requested image does not exist, just return its URL.
return image_url
f = default_storage.open(image_url)
try:
image = Image.open(f)
except:
# Invalid image format
return image_url
image_info = image.info
width = int(width)
height = int(height)
# If already right size, don't do anything.
if width == image.size[0] or height == image.size[1]:
return image_url
# Set dimensions.
if width and height:
#print 'Both dimensions of %s are specified' % image_url
if float(height) / width < float(image.size[1]) / image.size[0]:
#print 'Original image is tall and slim, will resize by width only'
height = 0
else:
#print 'Original image is wide and short, will resize by height only'
#print 'Because %s is less than %s' % (float(image.size[1]) / image.size[0],
# float(height) / width)
width = 0
if not width:
width = int(round(float(image.size[0]) * height / image.size[1]))
elif not height:
height = int(round(float(image.size[1]) * width / image.size[0]))
if image.mode not in ("P", "L", "RGBA"):
image = image.convert("RGBA")
# Required for progressive jpgs.
ImageFile.MAXBLOCK = image.size[0] * image.size[1]
try:
image = ImageOps.fit(image, (width, height), Image.ANTIALIAS)
image = image.save(thumb_path, filetype, quality=quality, **image_info)
# Push a remote copy of the thumbnail if MEDIA_URL is
# absolute.
if "://" in settings.MEDIA_URL:
with open(thumb_path, "r") as f:
default_storage.save(thumb_url, File(f))
except Exception:
# If an error occurred, a corrupted image may have been saved,
# so remove it, otherwise the check for it existing will just
# return the corrupted image next time it's requested.
#print 'Failed to convert image! Error: %s' % traceback.format_exc()
try:
os.remove(thumb_path)
except Exception:
#print 'Failed to remove thumbnail! Error: %s' % traceback.format_exc()
pass
return image_url
return thumb_url
