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"""Image utilities ported from Compass."""
from __future__ import absolute_import
from __future__ import print_function
from __future__ import unicode_literals
import logging
import mimetypes
import os.path
import six
from six.moves import xrange
from . import _image_size_cache
from .helpers import add_cache_buster
from scss import config
from scss.namespace import Namespace
from scss.types import Color, List, Number, String
from scss.util import escape, getmtime, make_data_url, make_filename_hash
try:
from PIL import Image
except ImportError:
try:
import Image
except:
Image = None
log = logging.getLogger(__name__)
ns = images_namespace = Namespace()
__all__ = ['images_namespace']
def _images_root():
return config.STATIC_ROOT if config.IMAGES_ROOT is None else config.IMAGES_ROOT
def _image_url(path, only_path=False, cache_buster=True, dst_color=None, src_color=None, inline=False, mime_type=None, spacing=None, collapse_x=None, collapse_y=None):
"""
src_color - a list of or a single color to be replaced by each corresponding dst_color colors
spacing - spaces to be added to the image
collapse_x, collapse_y - collapsable (layered) image of the given size (x, y)
"""
if inline or dst_color or spacing:
if not Image:
raise Exception("Images manipulation require PIL")
filepath = String.unquoted(path).value
fileext = os.path.splitext(filepath)[1].lstrip('.').lower()
if mime_type:
mime_type = String.unquoted(mime_type).value
if not mime_type:
mime_type = mimetypes.guess_type(filepath)[0]
if not mime_type:
mime_type = 'image/%s' % fileext
path = None
IMAGES_ROOT = _images_root()
if callable(IMAGES_ROOT):
try:
_file, _storage = list(IMAGES_ROOT(filepath))[0]
except IndexError:
filetime = None
else:
filetime = getmtime(_file, _storage)
if filetime is None:
filetime = 'NA'
elif inline or dst_color or spacing:
path = _storage.open(_file)
else:
_path = os.path.join(IMAGES_ROOT.rstrip(os.sep), filepath.strip('\\/'))
filetime = getmtime(_path)
if filetime is None:
filetime = 'NA'
elif inline or dst_color or spacing:
path = open(_path, 'rb')
BASE_URL = config.IMAGES_URL or config.STATIC_URL
if path:
dst_colors = [list(Color(v).value[:3]) for v in List.from_maybe(dst_color) if v]
src_color = Color.from_name('black') if src_color is None else src_color
src_colors = [tuple(Color(v).value[:3]) for v in List.from_maybe(src_color)]
len_colors = max(len(dst_colors), len(src_colors))
dst_colors = (dst_colors * len_colors)[:len_colors]
src_colors = (src_colors * len_colors)[:len_colors]
spacing = Number(0) if spacing is None else spacing
spacing = [int(Number(v).value) for v in List.from_maybe(spacing)]
spacing = (spacing * 4)[:4]
file_name, file_ext = os.path.splitext(os.path.normpath(filepath).replace(os.sep, '_'))
key = (filetime, src_color, dst_color, spacing)
asset_file = file_name + '-' + make_filename_hash(key) + file_ext
ASSETS_ROOT = config.ASSETS_ROOT or os.path.join(config.STATIC_ROOT, 'assets')
asset_path = os.path.join(ASSETS_ROOT, asset_file)
if os.path.exists(asset_path):
filepath = asset_file
BASE_URL = config.ASSETS_URL
if inline:
path = open(asset_path, 'rb')
url = make_data_url(mime_type, path.read())
else:
url = '%s%s' % (BASE_URL, filepath)
if cache_buster:
filetime = getmtime(asset_path)
url = add_cache_buster(url, filetime)
else:
simply_process = False
image = None
if fileext in ('cur',):
simply_process = True
else:
try:
image = Image.open(path)
except IOError:
if not collapse_x and not collapse_y and not dst_colors:
simply_process = True
if simply_process:
if inline:
url = make_data_url(mime_type, path.read())
else:
url = '%s%s' % (BASE_URL, filepath)
if cache_buster:
filetime = getmtime(asset_path)
url = add_cache_buster(url, filetime)
else:
width, height = collapse_x or image.size[0], collapse_y or image.size[1]
new_image = Image.new(
mode='RGBA',
size=(width + spacing[1] + spacing[3], height + spacing[0] + spacing[2]),
color=(0, 0, 0, 0)
)
for i, dst_color in enumerate(dst_colors):
src_color = src_colors[i]
pixdata = image.load()
for _y in xrange(image.size[1]):
for _x in xrange(image.size[0]):
pixel = pixdata[_x, _y]
if pixel[:3] == src_color:
pixdata[_x, _y] = tuple([int(c) for c in dst_color] + [pixel[3] if len(pixel) == 4 else 255])
iwidth, iheight = image.size
if iwidth != width or iheight != height:
cy = 0
while cy < iheight:
cx = 0
while cx < iwidth:
cropped_image = image.crop((cx, cy, cx + width, cy + height))
new_image.paste(cropped_image, (int(spacing[3]), int(spacing[0])), cropped_image)
cx += width
cy += height
else:
new_image.paste(image, (int(spacing[3]), int(spacing[0])))
if not inline:
try:
new_image.save(asset_path)
filepath = asset_file
BASE_URL = config.ASSETS_URL
if cache_buster:
filetime = getmtime(asset_path)
except IOError:
log.exception("Error while saving image")
inline = True # Retry inline version
url = os.path.join(config.ASSETS_URL.rstrip(os.sep), asset_file.lstrip(os.sep))
if cache_buster:
url = add_cache_buster(url, filetime)
if inline:
output = six.BytesIO()
new_image.save(output, format='PNG')
contents = output.getvalue()
output.close()
url = make_data_url(mime_type, contents)
else:
url = os.path.join(BASE_URL.rstrip('/'), filepath.lstrip('\\/'))
if cache_buster and filetime != 'NA':
url = add_cache_buster(url, filetime)
if not os.sep == '/':
url = url.replace(os.sep, '/')
if not only_path:
url = 'url(%s)' % escape(url)
return String.unquoted(url)
@ns.declare
def inline_image(image, mime_type=None, dst_color=None, src_color=None, spacing=None, collapse_x=None, collapse_y=None):
"""
Embeds the contents of a file directly inside your stylesheet, eliminating
the need for another HTTP request. For small files such images or fonts,
this can be a performance benefit at the cost of a larger generated CSS
file.
"""
return _image_url(image, False, False, dst_color, src_color, True, mime_type, spacing, collapse_x, collapse_y)
@ns.declare
def image_url(path, only_path=False, cache_buster=True, dst_color=None, src_color=None, spacing=None, collapse_x=None, collapse_y=None):
"""
Generates a path to an asset found relative to the project's images
directory.
Passing a true value as the second argument will cause the only the path to
be returned instead of a `url()` function
"""
return _image_url(path, only_path, cache_buster, dst_color, src_color, False, None, spacing, collapse_x, collapse_y)
@ns.declare
def image_width(image):
"""
Returns the width of the image found at the path supplied by `image`
relative to your project's images directory.
"""
if not Image:
raise Exception("Images manipulation require PIL")
filepath = String.unquoted(image).value
path = None
try:
width = _image_size_cache[filepath][0]
except KeyError:
width = 0
IMAGES_ROOT = _images_root()
if callable(IMAGES_ROOT):
try:
_file, _storage = list(IMAGES_ROOT(filepath))[0]
except IndexError:
pass
else:
path = _storage.open(_file)
else:
_path = os.path.join(IMAGES_ROOT, filepath.strip(os.sep))
if os.path.exists(_path):
path = open(_path, 'rb')
if path:
image = Image.open(path)
size = image.size
width = size[0]
_image_size_cache[filepath] = size
return Number(width, 'px')
@ns.declare
def image_height(image):
"""
Returns the height of the image found at the path supplied by `image`
relative to your project's images directory.
"""
if not Image:
raise Exception("Images manipulation require PIL")
filepath = String.unquoted(image).value
path = None
try:
height = _image_size_cache[filepath][1]
except KeyError:
height = 0
IMAGES_ROOT = _images_root()
if callable(IMAGES_ROOT):
try:
_file, _storage = list(IMAGES_ROOT(filepath))[0]
except IndexError:
pass
else:
path = _storage.open(_file)
else:
_path = os.path.join(IMAGES_ROOT, filepath.strip(os.sep))
if os.path.exists(_path):
path = open(_path, 'rb')
if path:
image = Image.open(path)
size = image.size
height = size[1]
_image_size_cache[filepath] = size
return Number(height, 'px')
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