def build_image(file,
size,
pre_key,
crop=False,
quality=90,
cache=False,
unique_key=None,
constrain=False):
"""
Builds a resized image based off of the original image.
"""
try:
quality = int(quality)
except TypeError:
quality = 90
if settings.USE_S3_STORAGE:
content = read_media_file_from_s3(file)
image = Image.open(StringIO(content))
else:
if hasattr(file, 'path') and exists(file.path):
image = Image.open(file.path) # get image
else:
raise Http404
image_options = {'quality': quality}
if image.format == 'GIF':
image_options['transparency'] = 0
format = image.format
if image.format in ('GIF', 'PNG'):
if image.mode != "RGBA":
image = image.convert("RGBA")
image.format = format # this is lost in conversion
elif image.format == 'JPEG':
# handle infamous error
# IOError: cannot write mode P as JPEG
if image.mode != "RGB":
image = image.convert("RGB")
if crop:
image = image_rescale(image, size) # thumbnail image
else:
format = image.format
image = image.resize(size, Image.ANTIALIAS) # resize image
image.format = format
binary = get_image_binary(image, **image_options)
if cache:
key = generate_image_cache_key(file, size, pre_key, crop, unique_key,
quality, constrain)
django_cache.add(key, binary,
60 * 60 * 24 * 30) # cache for 30 days #issue/134
return binary
def build_image(file,
size,
pre_key,
crop=False,
quality=90,
cache=False,
unique_key=None):
"""
Builds a resized image based off of the original image.
"""
try:
quality = int(quality)
except:
quality = 90
if settings.USE_S3_STORAGE:
content = read_media_file_from_s3(file)
image = Image.open(StringIO(content))
else:
if hasattr(file, 'path') and exists(file.path):
image = Image.open(file.path) # get image
else:
raise Http404
# handle infamous error
# IOError: cannot write mode P as JPEG
if image.mode != "RGB":
image = image.convert("RGB")
if crop:
image = image_rescale(image, size) # thumbnail image
else:
image = image.resize(size, Image.ANTIALIAS) # resize image
# mission: get binary
output = StringIO()
image.save(output, "JPEG", quality=quality)
binary = output.getvalue() # mission accomplished
output.close()
if cache:
key = generate_image_cache_key(file, size, pre_key, crop, unique_key,
quality)
django_cache.add(key, binary,
60 * 60 * 24 * 30) # cache for 30 days #issue/134
return binary
def build_image(file, size, pre_key, crop=False, quality=90, cache=False, unique_key=None, constrain=False):
"""
Builds a resized image based off of the original image.
"""
try:
quality = int(quality)
except TypeError:
quality = 90
if settings.USE_S3_STORAGE:
content = read_media_file_from_s3(file)
image = Image.open(StringIO(content))
else:
if hasattr(file, 'path') and exists(file.path):
image = Image.open(file.path) # get image
else:
raise Http404
image_options = {'quality': quality}
if image.format == 'GIF':
image_options['transparency'] = 0
format = image.format
if image.format in ('GIF', 'PNG'):
if image.mode != "RGBA":
image = image.convert("RGBA")
image.format = format # this is lost in conversion
elif image.format == 'JPEG':
# handle infamous error
# IOError: cannot write mode P as JPEG
if image.mode != "RGB":
image = image.convert("RGB")
if crop:
image = image_rescale(image, size) # thumbnail image
else:
format = image.format
image = image.resize(size, Image.ANTIALIAS) # resize image
image.format = format
binary = get_image_binary(image, **image_options)
if cache:
key = generate_image_cache_key(file, size, pre_key, crop, unique_key, quality, constrain)
django_cache.add(key, binary, 60 * 60 * 24 * 30) # cache for 30 days #issue/134
return binary
def build_image(file, size, pre_key, crop=False, quality=90, cache=False, unique_key=None):
"""
Builds a resized image based off of the original image.
"""
try:
quality = int(quality)
except:
quality = 90
if settings.USE_S3_STORAGE:
content = read_media_file_from_s3(file)
image = Image.open(StringIO(content))
else:
if hasattr(file, 'path') and exists(file.path):
image = Image.open(file.path) # get image
else:
raise Http404
# handle infamous error
# IOError: cannot write mode P as JPEG
if image.mode != "RGB":
image = image.convert("RGB")
if crop:
image = image_rescale(image, size) # thumbnail image
else:
image = image.resize(size, Image.ANTIALIAS) # resize image
# mission: get binary
output = StringIO()
image.save(output, "JPEG", quality=quality)
binary = output.getvalue() # mission accomplished
output.close()
if cache:
key = generate_image_cache_key(file, size, pre_key, crop, unique_key, quality)
django_cache.add(key, binary, 60 * 60 * 24 * 30) # cache for 30 days #issue/134
return binary
def image_preview(request, app_label, model, id, size):
"""
Grab all image link within a peice of content
and generate thumbnails of largest image
"""
# get page object; protect size
try:
content_type = ContentType.objects.get(app_label=app_label, model=model)
instance = content_type.get_object_for_this_type(id=id)
except:
return HttpResponseNotFound("Image not found.", mimetype="text/plain")
keys = [settings.CACHE_PRE_KEY, IMAGE_PREVIEW_CACHE, model, str(instance.id), size]
key = '.'.join(keys)
response = cache.get(key)
original_size = size
if not response:
from tendenci.core.base.utils import parse_image_sources, make_image_object_from_url, image_rescale
# set sizes
size_min = (30,30)
size_cap = (512,512)
size_tuple = size.split('x')
if len(size_tuple) == 2: size = int(size_tuple[0]), int(size_tuple[1])
else: size = int(size), int(size)
if size > size_cap: size = size_cap
image_urls = []
image = Pil.new('RGBA',size_min)
# find biggest image, dimension-wise
for image_url in image_urls:
image_candidate = make_image_object_from_url(image_url)
if image_candidate:
if image_candidate.size > image.size:
image = image_candidate
if image.size[1] > size_min[1]:
# rescale, convert-to true-colors; return response
image = image_rescale(image, size)
if image.mode != "RGB":
image = image.convert("RGB")
response = HttpResponse(mimetype='image/jpeg')
image.save(response, "JPEG", quality=100)
keys = [settings.CACHE_PRE_KEY, IMAGE_PREVIEW_CACHE, model, str(instance.id), size]
key = '.'.join(keys)
cache.set(key, response)
return response
else: # raise http 404 error (returns page not found)
return HttpResponseNotFound("Image not found.", mimetype="text/plain")
else:
return response
def image_preview(request, app_label, model, id, size):
"""
Grab all image link within a peice of content
and generate thumbnails of largest image
"""
# get page object; protect size
try:
content_type = ContentType.objects.get(app_label=app_label,
model=model)
instance = content_type.get_object_for_this_type(id=id)
except:
return HttpResponseNotFound("Image not found.", mimetype="text/plain")
keys = [
settings.CACHE_PRE_KEY, IMAGE_PREVIEW_CACHE, model,
str(instance.id), size
]
key = '.'.join(keys)
response = cache.get(key)
original_size = size
if not response:
from tendenci.core.base.utils import parse_image_sources, make_image_object_from_url, image_rescale
# set sizes
size_min = (30, 30)
size_cap = (512, 512)
size_tuple = size.split('x')
if len(size_tuple) == 2: size = int(size_tuple[0]), int(size_tuple[1])
else: size = int(size), int(size)
if size > size_cap: size = size_cap
image_urls = []
image = Pil.new('RGBA', size_min)
# find biggest image, dimension-wise
for image_url in image_urls:
image_candidate = make_image_object_from_url(image_url)
if image_candidate:
if image_candidate.size > image.size:
image = image_candidate
if image.size[1] > size_min[1]:
# rescale, convert-to true-colors; return response
image = image_rescale(image, size)
if image.mode != "RGB":
image = image.convert("RGB")
response = HttpResponse(mimetype='image/jpeg')
image.save(response, "JPEG", quality=100)
keys = [
settings.CACHE_PRE_KEY, IMAGE_PREVIEW_CACHE, model,
str(instance.id), size
]
key = '.'.join(keys)
cache.set(key, response)
return response
else: # raise http 404 error (returns page not found)
return HttpResponseNotFound("Image not found.",
mimetype="text/plain")
else:
return response
