def transform(self, img, width, flip_horizontal, height, flip_vertical, image_format, halign="center", valign="middle"):
if not width and not height:
width = img.width
height = img.height
if float(width) / float(img.width) > float(height) / float(img.height):
img.resize(width=width)
image_width = width
image_height = float(width) / float(img.width) * float(img.height)
else:
img.resize(height=height)
image_width = float(height) / float(img.height) * float(img.width)
image_height = height
rect = BoundingRect(height=image_height, width=image_width)
rect.set_size(height=height, width=width, halign=halign, valign=valign)
if not width:
width = rect.target_width
if not height:
height = rect.target_height
img.crop(left_x=rect.left,
top_y=rect.top,
right_x=rect.right,
bottom_y=rect.bottom)
if flip_horizontal:
img.horizontal_flip()
if flip_vertical:
img.vertical_flip()
return img.execute_transforms(output_encoding=image_format, quality=QUALITY)
def test_rect_percentages():
rect = BoundingRect(width=640, height=480)
rect.set_size(width=320, height=300)
assert rect.left == 0.25, rect.left
assert rect.right == 0.75, rect.right
assert rect.top == 0.1875, rect.top
assert rect.bottom == 0.8125, rect.bottom
def get(self,
flip_horizontal,
width,
flip_vertical,
height,
halign,
valign,
url):
if not url:
self._error(400, 'The url argument is mandatory!')
return
if not width and not height:
self._error(400, 'Either width or height are mandatory!')
url = join('http://', url)
if not self._verify_allowed_domains():
self._error(404, 'Your domain is not allowed!')
return
if not self._verify_allowed_sources(url):
self._error(404, 'Your image source is not allowed!')
return
width = width and int(width) or 0
height = height and int(height) or 0
if width > MAX_WIDTH:
width = MAX_WIDTH
if height > MAX_HEIGHT:
height = MAX_HEIGHT
if not halign:
halign = "center"
if not valign:
valign = "middle"
key = "%d_%d_%s_%s_%s" % (
width,
height,
halign,
valign,
url
)
extension = splitext(url)[-1]
image_format = extension in ('.jpg', '.jpeg') and JPEG or PNG
data = memcache.get(key)
self.response.headers['Cache-Key'] = key
if data is not None:
results = data
self.response.headers['Cache-Hit'] = 'True'
else:
query = "SELECT * FROM Picture WHERE url = :1 LIMIT 1"
pictures = db.GqlQuery(query, url).fetch(1)
try:
if len(pictures) > 0:
picture = pictures[0]
if picture.is_expired():
img = picture.fetch_image()
picture.put()
else:
img = Image(picture.picture)
else:
picture = Picture()
picture.url = url
img = picture.fetch_image()
picture.put()
except ImageNotFoundError:
self._error(404, 'Your image source is not found!')
return
if float(width) / float(img.width) > float(height) / float(img.height):
img.resize(width=width)
image_width = width
image_height = float(width) / float(img.width) * float(img.height)
else:
img.resize(height=height)
image_width = float(height) / float(img.height) * float(img.width)
image_height = height
rect = BoundingRect(height=image_height, width=image_width)
rect.set_size(height=height, width=width, halign=halign, valign=valign)
if not width:
width = rect.target_width
if not height:
height = rect.target_height
img.crop(left_x=rect.left,
top_y=rect.top,
right_x=rect.right,
bottom_y=rect.bottom)
if flip_horizontal:
img.horizontal_flip()
if flip_vertical:
img.vertical_flip()
results = img.execute_transforms(output_encoding=image_format, quality=QUALITY)
memcache.set(key=key,
value=results,
time=EXPIRATION) # ONE MONTH
self.response.headers['Cache-Hit'] = 'False'
self.response.headers['Content-Type'] = image_format == JPEG and 'image/jpeg' or 'image/png'
self.response.out.write(results)
