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"""Image utilities ported from Compass."""
from __future__ import absolute_import
from __future__ import print_function
import base64
import hashlib
import logging
import mimetypes
import os.path
import time
import six
from six.moves import xrange
from scss import config
from scss.functions.compass import _image_size_cache
from scss.functions.compass.helpers import add_cache_buster
from scss.functions.library import FunctionLibrary
from scss.types import ColorValue, ListValue, NumberValue, StringValue
from scss.util import escape
try:
from PIL import Image
except ImportError:
try:
import Image
except:
Image = None
log = logging.getLogger(__name__)
COMPASS_IMAGES_LIBRARY = FunctionLibrary()
register = COMPASS_IMAGES_LIBRARY.register
# ------------------------------------------------------------------------------
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 = StringValue(path).value
mime_type = inline and (StringValue(mime_type).value or mimetypes.guess_type(filepath)[0])
path = None
if callable(config.STATIC_ROOT):
try:
_file, _storage = list(config.STATIC_ROOT(filepath))[0]
d_obj = _storage.modified_time(_file)
filetime = int(time.mktime(d_obj.timetuple()))
if inline or dst_color or spacing:
path = _storage.open(_file)
except:
filetime = 'NA'
else:
_path = os.path.join(config.STATIC_ROOT, filepath.strip('/'))
if os.path.exists(_path):
filetime = int(os.path.getmtime(_path))
if inline or dst_color or spacing:
path = open(_path, 'rb')
else:
filetime = 'NA'
BASE_URL = config.STATIC_URL
if path:
dst_colors = dst_color
if isinstance(dst_colors, ListValue):
dst_colors = [list(ColorValue(v).value[:3]) for n, v in dst_colors.items() if v]
else:
dst_colors = [list(ColorValue(dst_colors).value[:3])] if dst_colors else []
src_colors = src_color
if isinstance(src_colors, ListValue):
src_colors = [tuple(ColorValue(v).value[:3]) if v else (0, 0, 0) for n, v in src_colors.items()]
else:
src_colors = [tuple(ColorValue(src_colors).value[:3]) if src_colors else (0, 0, 0)]
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]
if isinstance(spacing, ListValue):
spacing = [int(NumberValue(v).value) for n, v in spacing.items()]
else:
spacing = [int(NumberValue(spacing).value)]
spacing = (spacing * 4)[:4]
file_name, file_ext = os.path.splitext(os.path.normpath(filepath).replace('\\', '_').replace('/', '_'))
key = (filetime, src_color, dst_color, spacing)
key = file_name + '-' + base64.urlsafe_b64encode(hashlib.md5(repr(key)).digest()).rstrip('=').replace('-', '_')
asset_file = 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 = 'data:' + mime_type + ';base64,' + base64.b64encode(path.read())
else:
url = '%s%s' % (BASE_URL, filepath)
if cache_buster:
filetime = int(os.path.getmtime(asset_path))
url = add_cache_buster(url, filetime)
else:
image = Image.open(path)
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 = int(os.path.getmtime(asset_path))
except IOError:
log.exception("Error while saving image")
inline = True # Retry inline version
url = '%s%s' % (config.ASSETS_URL, asset_file)
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 = 'data:' + mime_type + ';base64,' + base64.b64encode(contents)
else:
url = '%s%s' % (BASE_URL, filepath)
if cache_buster:
url = add_cache_buster(url, filetime)
if not only_path:
url = 'url("%s")' % escape(url)
return StringValue(url)
@register('inline-image', 1)
@register('inline-image', 2)
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)
@register('image-url', 1)
@register('image-url', 2)
@register('image-url', 3)
@register('image-url', 4)
@register('image-url', 5)
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)
@register('image-width', 1)
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 = StringValue(image).value
path = None
try:
width = _image_size_cache[filepath][0]
except KeyError:
width = 0
if callable(config.STATIC_ROOT):
try:
_file, _storage = list(config.STATIC_ROOT(filepath))[0]
path = _storage.open(_file)
except:
pass
else:
_path = os.path.join(config.STATIC_ROOT, filepath.strip('/'))
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 NumberValue(width, 'px')
@register('image-height', 1)
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 = StringValue(image).value
path = None
try:
height = _image_size_cache[filepath][1]
except KeyError:
height = 0
if callable(config.STATIC_ROOT):
try:
_file, _storage = list(config.STATIC_ROOT(filepath))[0]
path = _storage.open(_file)
except:
pass
else:
_path = os.path.join(config.STATIC_ROOT, filepath.strip('/'))
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 NumberValue(height, 'px')
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