def testPackSequentialWidth(self):
# AAAAAAAA
# BBBBBBB
# CCCCCC
# DDDDD
# EEEE
# FFF
# GG
# H
boxes = [Box(i, 1) for i in range(1, 9)]
# AAAAAAAA
# BBBBBBBH
# CCCCCCGG
# DDDDDFFF
# EEEE
packing = [
(0, 0, Box(8, 1)),
(0, 1, Box(7, 1)),
(7, 1, Box(1, 1)),
(0, 2, Box(6, 1)),
(6, 2, Box(2, 1)),
(0, 3, Box(5, 1)),
(5, 3, Box(3, 1)),
(0, 4, Box(4, 1)),
]
(_, _, actual) = pack_boxes(boxes, 8)
self.assert_(check_no_overlap(actual))
self.assertEqual(actual, packing)
def testPackSequentialWidth(self):
# AAAAAAAA
# BBBBBBB
# CCCCCC
# DDDDD
# EEEE
# FFF
# GG
# H
boxes = [Box(i, 1) for i in range(1, 9)]
# AAAAAAAA
# BBBBBBBH
# CCCCCCGG
# DDDDDFFF
# EEEE
packing = [
(0, 0, Box(8, 1)),
(0, 1, Box(7, 1)),
(7, 1, Box(1, 1)),
(0, 2, Box(6, 1)),
(6, 2, Box(2, 1)),
(0, 3, Box(5, 1)),
(5, 3, Box(3, 1)),
(0, 4, Box(4, 1)),
]
(_, _, actual) = pack_boxes(boxes, 8)
self.assert_(check_no_overlap(actual))
self.assertEqual(actual, packing)
def testRandomNoOverlap(self):
# Not having overlap is an important invariant we need to maintain.
# This just checks it.
boxes = [Box(random.randrange(1, 40), random.randrange(1, 40))
for _ in xrange(100)]
(_, _, actual) = pack_boxes(boxes)
self.assert_(check_no_overlap(actual))
def make_bundle(self, versioner):
import Image # If this fails, you need the Python Imaging Library.
# get the image paths excluding the sprite itself
paths = [path for path in self.get_paths() if not os.path.basename(path) == self.name + self.get_extension()]
boxes = [ImageBox(Image.open(path), path) for path in paths]
# Pick a max_width so that the sprite is squarish and a multiple of 16,
# and so no image is too wide to fit.
total_area = sum(box.width * box.height for box in boxes)
width = max(max(box.width for box in boxes),
(int(math.sqrt(total_area)) // 16 + 1) * 16)
(_, height, packing) = pack_boxes(boxes, width)
sprite = Image.new("RGBA", (width, height))
for (left, top, box) in packing:
# This is a bit of magic to make the transparencies work. To
# preserve transparency, we pass the image so it can take its
# alpha channel mask or something. However, if the image has no
# alpha channels, then it fails, we we have to check if the
# image is RGBA here.
img = box.image
mask = img if img.mode == "RGBA" else None
sprite.paste(img, (left, top), mask)
sprite.save(self.get_bundle_path(), "PNG")
self._optimize_output()
# It's *REALLY* important that this happen here instead of after the
# generate_css() call, because if we waited, the CSS woudl have the URL
# of the last version of this bundle.
if versioner:
versioner.update_bundle_version(self)
self.generate_css(packing)
def make_bundle(self, versioner):
import Image # If this fails, you need the Python Imaging Library.
boxes = [ImageBox(Image.open(path), path) for path in self.get_paths()]
# Pick a max_width so that the sprite is squarish and a multiple of 16,
# and so no image is too wide to fit.
total_area = sum(box.width * box.height for box in boxes)
width = max(max(box.width for box in boxes),
(int(math.sqrt(total_area)) // 16 + 1) * 16)
(_, height, packing) = pack_boxes(boxes, width)
sprite = Image.new("RGBA", (width, height))
for (left, top, box) in packing:
# This is a bit of magic to make the transparencies work. To
# preserve transparency, we pass the image so it can take its
# alpha channel mask or something. However, if the image has no
# alpha channels, then it fails, we we have to check if the
# image is RGBA here.
img = box.image
mask = img if img.mode == "RGBA" else None
sprite.paste(img, (left, top), mask)
sprite.save(self.get_bundle_path(), "PNG")
self._optimize_output()
# It's *REALLY* important that this happen here instead of after the
# generate_css() call, because if we waited, the CSS woudl have the URL
# of the last version of this bundle.
if versioner:
versioner.update_bundle_version(self)
self.generate_css(packing)
def testPackEasy(self):
# AA
# B
# C
boxes = [Box(2, 1), Box(1, 1), Box(1, 1)]
# AA
# BC
packing = [(0, 0, Box(2, 1)), (0, 1, Box(1, 1)), (1, 1, Box(1, 1))]
(_, _, actual) = pack_boxes(boxes, 2)
self.assert_(check_no_overlap(actual))
self.assertEqual(actual, packing)
def testPackSequenceHeightWidth(self):
# A
# B
# B
# C
# C
# C
# DD
# EE
# EE
# FF
# FF
# FF
# GGG
# HHH
# HHH
# III
# III
# III
boxes = [Box(i, j) for i in range(1, 4) for j in range(1, 4)]
# III
# III
# III
# FFC
# FFC
# FFC
# HHH
# HHH
# EEB
# EEB
# GGG
# DDA
packing = [
(0, 0, Box(3, 3)),
(0, 3, Box(2, 3)),
(2, 3, Box(1, 3)),
(0, 6, Box(3, 2)),
(0, 8, Box(2, 2)),
(2, 8, Box(1, 2)),
(0, 10, Box(3, 1)),
(0, 11, Box(2, 1)),
(2, 11, Box(1, 1)),
]
(_, _, actual) = pack_boxes(boxes, 3)
self.assert_(check_no_overlap(actual))
self.assertEqual(actual, packing)
def testPackSequenceHeightWidth(self):
# A
# B
# B
# C
# C
# C
# DD
# EE
# EE
# FF
# FF
# FF
# GGG
# HHH
# HHH
# III
# III
# III
boxes = [Box(i, j) for i in range(1, 4) for j in range(1, 4)]
# III
# III
# III
# HHH
# HHH
# GGG
# FFC
# FFC
# FFC
# EEB
# EEB
# DDA
packing = [
(0, 0, Box(3, 3)),
(0, 3, Box(3, 2)),
(0, 5, Box(3, 1)),
(0, 6, Box(2, 3)),
(2, 6, Box(1, 3)),
(0, 9, Box(2, 2)),
(2, 9, Box(1, 2)),
(0, 11, Box(2, 1)),
(2, 11, Box(1, 1)),
]
(_, _, actual) = pack_boxes(boxes, 3)
self.assert_(check_no_overlap(actual))
self.assertEqual(actual, packing)
def testPackEasy(self):
# AA
# B
# C
boxes = [
Box(2, 1),
Box(1, 1),
Box(1, 1),
]
# AA
# BC
packing = [
(0, 0, Box(2, 1)),
(0, 1, Box(1, 1)),
(1, 1, Box(1, 1)),
]
(_, _, actual) = pack_boxes(boxes, 2)
self.assert_(check_no_overlap(actual))
self.assertEqual(actual, packing)
def testPackSingle(self):
boxes = [Box(1, 1)]
packing = [(0, 0, Box(1, 1))]
(_, _, actual) = pack_boxes(boxes, 1)
self.assert_(check_no_overlap(actual))
self.assertEqual(actual, packing)
def testPackSingle(self):
boxes = [Box(1, 1)]
packing = [(0, 0, Box(1, 1))]
(_, _, actual) = pack_boxes(boxes, 1)
self.assert_(check_no_overlap(actual))
self.assertEqual(actual, packing)
def handle_noargs(self, **options):
version_stamp = str(int(time.mktime(datetime.now().timetuple())))
BUFFER_SIZE = 40
images = []
filenames = []
boxes = []
directories = getattr(settings, 'SPRITE_DIRS',
['/media/public_media/images/sprites'])
for directory in directories:
for image in [
f for f in os.listdir(directory) if f.endswith('.png')
]:
image_file = Image.open('%s/%s' % (
directory,
image,
))
image_width, image_height = image_file.size
boxes.append(Box(image_width, image_height, image_file))
max_width, y_off, packing = pack_boxes(boxes)
master = Image.new(mode='RGBA',
size=(max_width, y_off),
color=(0, 0, 0, 0)) # fully transparent
for x, y, image in packing:
master.paste(image.filename, (x, y))
map_ouput = '%s' % getattr(settings, 'SPRITE_MAP_OUTPUT')
location = '%ssprites.r%s.%s' % (getattr(
settings, 'SPRITE_MAP_OUTPUT'), version_stamp, 'png')
master.save(location)
css_file_location = '%ssprites.css' % getattr(settings,
'SPRITE_CSS_OUTPUT')
sprite_url = '../images/sprites.r%s.png' % version_stamp
iconCssFile = open(css_file_location, 'w')
print css_file_location
for x, y, image in packing:
image_file = image.filename
image_width, image_height = image_file.size
filename = image_file.filename.split('/')[-1].split('.')[0]
css = """.sprite_%(filename)s {
background-position: -%(top)spx -%(left)spx;
width:%(width)spx;
height:%(height)spx;
display: inline-block;
}
""" % {
'filename': filename,
'top': x,
'left': y,
'width': image_width,
'height': image_height
}
iconCssFile.write(css)
iconCssFile.write("""
.sprite, .sprite_inline {
background-image: url('%s');
*background-image: url('%s');
}
""" % (sprite_url, sprite_url))
iconCssFile.close()