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Cleanup wagtailimages backends code

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This commit is contained in:
Karl Hobley 2014-06-02 09:36:06 +01:00
parent 9ccdcc604e
commit d88a5e596b
3 changed files with 13 additions and 17 deletions
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21
wagtail/wagtailimages/backends/base.py
View file

@ -1,6 +1,7 @@
from django.conf import settings
from django.core.exceptions import ImproperlyConfigured
class InvalidImageBackendError(ImproperlyConfigured):
pass
@ -8,23 +9,22 @@ class InvalidImageBackendError(ImproperlyConfigured):
class BaseImageBackend(object):
def __init__(self, params):
self.quality = getattr(settings, 'IMAGE_COMPRESSION_QUALITY', 85)
def open_image(self, input_file):
"""
Open an image and return the backend specific image object to pass
to other methods. The object return has to have a size attribute
Open an image and return the backend specific image object to pass
to other methods. The object return has to have a size attribute
which is a tuple with the width and height of the image and a format
attribute with the format of the image.
"""
raise NotImplementedError('subclasses of BaseImageBackend must provide an open_image() method')
def save_image(self, image, output):
"""
Save the image to the output
"""
raise NotImplementedError('subclasses of BaseImageBackend must provide a save_image() method')
def resize(self, image, size):
"""
resize image to the requested size, using highest quality settings
@ -32,11 +32,9 @@ class BaseImageBackend(object):
"""
raise NotImplementedError('subclasses of BaseImageBackend must provide an resize() method')
def crop_to_centre(self, image, size):
raise NotImplementedError('subclasses of BaseImageBackend must provide a crop_to_centre() method')
def resize_to_max(self, image, size):
"""
Resize image down to fit within the given dimensions, preserving aspect ratio.
@ -58,10 +56,8 @@ class BaseImageBackend(object):
final_size = (target_width, int(original_height * horz_scale))
else:
final_size = (int(original_width * vert_scale), target_height)
return self.resize(image, final_size)
return self.resize(image, final_size)
def resize_to_min(self, image, size):
"""
@ -87,7 +83,6 @@ class BaseImageBackend(object):
return self.resize(image, final_size)
def resize_to_width(self, image, target_width):
"""
Resize image down to the given width, preserving aspect ratio.
@ -104,7 +99,6 @@ class BaseImageBackend(object):
return self.resize(image, final_size)
def resize_to_height(self, image, target_height):
"""
Resize image down to the given height, preserving aspect ratio.
@ -121,7 +115,6 @@ class BaseImageBackend(object):
return self.resize(image, final_size)
def resize_to_fill(self, image, size):
"""
Resize down and crop image to fill the given dimensions. Most suitable for thumbnails.

7
wagtail/wagtailimages/backends/pillow.py
View file

@ -1,6 +1,9 @@
from base import BaseImageBackend
from __future__ import absolute_import
from .base import BaseImageBackend
import PIL.Image
class PillowBackend(BaseImageBackend):
def __init__(self, params):
super(PillowBackend, self).__init__(params)
@ -32,4 +35,4 @@ class PillowBackend(BaseImageBackend):
top = (original_height - final_height) / 2
return image.crop(
(left, top, left + final_width, top + final_height)
)
)

2
wagtail/wagtailimages/backends/wand.py
View file

@ -1,9 +1,9 @@
from __future__ import absolute_import
from .base import BaseImageBackend
from wand.image import Image
class WandBackend(BaseImageBackend):
def __init__(self, params):
super(WandBackend, self).__init__(params)