def generate_thumbnail(self, thumbnail_options, high_resolution=False,
silent_template_exception=False, keep_file_open=True):
"""
Return an unsaved ``ThumbnailFile`` containing a thumbnail image.
The thumbnail image is generated using the ``thumbnail_options``
dictionary.
"""
thumbnail_options = self.get_options(thumbnail_options)
orig_size = thumbnail_options['size'] # remember original size
# Size sanity check.
min_dim, max_dim = 0, 0
for dim in orig_size:
try:
dim = int(dim)
except (TypeError, ValueError):
continue
min_dim, max_dim = min(min_dim, dim), max(max_dim, dim)
if max_dim == 0 or min_dim < 0:
raise exceptions.EasyThumbnailsError(
"The source image is an invalid size (%sx%s)" % orig_size)
if high_resolution:
thumbnail_options['size'] = (orig_size[0] * 2, orig_size[1] * 2)
image = engine.generate_source_image(
self, thumbnail_options, self.source_generators,
fail_silently=silent_template_exception,
keep_file_open=keep_file_open)
if image is None:
raise exceptions.InvalidImageFormatError(
"The source file does not appear to be an image")
thumbnail_image = engine.process_image(image, thumbnail_options,
self.thumbnail_processors)
if high_resolution:
thumbnail_options['size'] = orig_size # restore original size
filename = self.get_thumbnail_name(
thumbnail_options,
transparent=utils.is_transparent(thumbnail_image),
high_resolution=high_resolution)
quality = thumbnail_options['quality']
subsampling = thumbnail_options['subsampling']
img = engine.save_image(
thumbnail_image, filename=filename, quality=quality,
subsampling=subsampling)
data = img.read()
thumbnail = ThumbnailFile(
filename, file=ContentFile(data), storage=self.thumbnail_storage,
thumbnail_options=thumbnail_options)
thumbnail.image = thumbnail_image
thumbnail._committed = False
return thumbnail
def generate_thumbnail(self,
thumbnail_options,
high_resolution=False,
silent_template_exception=False):
"""
Return an unsaved ``ThumbnailFile`` containing a thumbnail image.
The thumbnail image is generated using the ``thumbnail_options``
dictionary.
"""
thumbnail_options = self.get_options(thumbnail_options)
orig_size = thumbnail_options['size'] # remember original size
# Size sanity check.
min_dim, max_dim = 0, 0
for dim in orig_size:
try:
dim = int(dim)
except (TypeError, ValueError):
continue
min_dim, max_dim = min(min_dim, dim), max(max_dim, dim)
if max_dim == 0 or min_dim < 0:
raise exceptions.EasyThumbnailsError(
"The source image is an invalid size (%sx%s)" % orig_size)
if high_resolution:
thumbnail_options['size'] = (orig_size[0] * 2, orig_size[1] * 2)
image = engine.generate_source_image(
self,
thumbnail_options,
self.source_generators,
fail_silently=silent_template_exception)
if image is None:
raise exceptions.InvalidImageFormatError(
"The source file does not appear to be an image")
thumbnail_image = None
IS_GIF = False
if isinstance(image, GifImageFile):
IS_GIF = True
import images2gif
gif_image, gif_params = images2gif.readGif(image, False)
frames = []
for frame in gif_image:
thumbnail_frame = engine.process_image(
frame, thumbnail_options, self.thumbnail_processors)
frames.append(thumbnail_frame)
if thumbnail_image is None:
thumbnail_image = frame
else:
thumbnail_image = engine.process_image(image, thumbnail_options,
self.thumbnail_processors)
if high_resolution:
thumbnail_options['size'] = orig_size # restore original size
filename = self.get_thumbnail_name(
thumbnail_options,
transparent=utils.is_transparent(thumbnail_image),
high_resolution=high_resolution)
quality = thumbnail_options['quality']
subsampling = thumbnail_options['subsampling']
if IS_GIF:
try:
# try save with speedup
img = images2gif.writeGif(frames, **gif_params)
saved = True
except:
# if not saved, simple save
gif_params.update({
'subRectangles': False,
})
img = images2gif.writeGif(frames, **gif_params)
else:
img = engine.save_image(thumbnail_image,
filename=filename,
quality=quality,
subsampling=subsampling)
data = img.read()
thumbnail = ThumbnailFile(filename,
file=ContentFile(data),
storage=self.thumbnail_storage,
thumbnail_options=thumbnail_options)
thumbnail.image = thumbnail_image
thumbnail._committed = False
return thumbnail