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"""Functions used for generating packed CSS sprite maps.
These are ported from the Binary Tree Bin Packing Algorithm:
http://codeincomplete.com/posts/2011/5/7/bin_packing/
"""
from __future__ import absolute_import
from __future__ import unicode_literals
# Copyright (c) 2011, 2012, 2013 Jake Gordon and contributors
# Copyright (c) 2013 German M. Bravo
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
# The above copyright notice and this permission notice shall be included in all
# copies or substantial portions of the Software.
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
# SOFTWARE.
class LayoutNode(object):
def __init__(self, x, y, w, h, down=None, right=None, used=False):
self.x = x
self.y = y
self.w = w
self.h = h
self.down = down
self.right = right
self.used = used
self.width = 0
self.height = 0
@property
def area(self):
return self.width * self.height
def __repr__(self):
return '<%s (%s, %s) [%sx%s]>' % (self.__class__.__name__, self.x, self.y, self.w, self.h)
class SpritesLayout(object):
def __init__(self, blocks, padding=None, margin=None, ppadding=None, pmargin=None):
self.num_blocks = len(blocks)
if margin is None:
margin = [[0] * 4] * self.num_blocks
elif not isinstance(margin, (tuple, list)):
margin = [[margin] * 4] * self.num_blocks
elif not isinstance(margin[0], (tuple, list)):
margin = [margin] * self.num_blocks
if padding is None:
padding = [[0] * 4] * self.num_blocks
elif not isinstance(padding, (tuple, list)):
padding = [[padding] * 4] * self.num_blocks
elif not isinstance(padding[0], (tuple, list)):
padding = [padding] * self.num_blocks
if pmargin is None:
pmargin = [[0.0] * 4] * self.num_blocks
elif not isinstance(pmargin, (tuple, list)):
pmargin = [[pmargin] * 4] * self.num_blocks
elif not isinstance(pmargin[0], (tuple, list)):
pmargin = [pmargin] * self.num_blocks
if ppadding is None:
ppadding = [[0.0] * 4] * self.num_blocks
elif not isinstance(ppadding, (tuple, list)):
ppadding = [[ppadding] * 4] * self.num_blocks
elif not isinstance(ppadding[0], (tuple, list)):
ppadding = [ppadding] * self.num_blocks
self.blocks = tuple((
b[0] + padding[i][3] + padding[i][1] + margin[i][3] + margin[i][1] + int(round(b[0] * (ppadding[i][3] + ppadding[i][1] + pmargin[i][3] + pmargin[i][1]))),
b[1] + padding[i][0] + padding[i][2] + margin[i][0] + margin[i][2] + int(round(b[1] * (ppadding[i][0] + ppadding[i][2] + pmargin[i][0] + pmargin[i][2]))),
b[0],
b[1],
i
) for i, b in enumerate(blocks))
self.margin = margin
self.padding = padding
self.pmargin = pmargin
self.ppadding = ppadding
class PackedSpritesLayout(SpritesLayout):
@staticmethod
def MAXSIDE(a, b):
"""maxside: Sort pack by maximum sides"""
return cmp(max(b[0], b[1]), max(a[0], a[1])) or cmp(min(b[0], b[1]), min(a[0], a[1])) or cmp(b[1], a[1]) or cmp(b[0], a[0])
@staticmethod
def WIDTH(a, b):
"""width: Sort pack by width"""
return cmp(b[0], a[0]) or cmp(b[1], a[1])
@staticmethod
def HEIGHT(a, b):
"""height: Sort pack by height"""
return cmp(b[1], a[1]) or cmp(b[0], a[0])
@staticmethod
def AREA(a, b):
"""area: Sort pack by area"""
return cmp(b[0] * b[1], a[0] * a[1]) or cmp(b[1], a[1]) or cmp(b[0], a[0])
def __init__(self, blocks, padding=None, margin=None, ppadding=None, pmargin=None, methods=None):
super(PackedSpritesLayout, self).__init__(blocks, padding, margin, ppadding, pmargin)
ratio = 0
if methods is None:
methods = (self.MAXSIDE, self.WIDTH, self.HEIGHT, self.AREA)
for method in methods:
sorted_blocks = sorted(
self.blocks,
cmp=method,
)
root = LayoutNode(
x=0,
y=0,
w=sorted_blocks[0][0] if sorted_blocks else 0,
h=sorted_blocks[0][1] if sorted_blocks else 0
)
area = 0
nodes = [None] * self.num_blocks
for block in sorted_blocks:
w, h, width, height, i = block
node = self._findNode(root, w, h)
if node:
node = self._splitNode(node, w, h)
else:
root = self._growNode(root, w, h)
node = self._findNode(root, w, h)
if node:
node = self._splitNode(node, w, h)
else:
node = None
nodes[i] = node
node.width = width
node.height = height
area += node.area
this_ratio = area / float(root.w * root.h)
# print method.__doc__, "%g%%" % (this_ratio * 100)
if ratio < this_ratio:
self.root = root
self.nodes = nodes
self.method = method
ratio = this_ratio
if ratio > 0.96:
break
# print self.method.__doc__, "%g%%" % (ratio * 100)
def __iter__(self):
for i, node in enumerate(self.nodes):
margin, padding = self.margin[i], self.padding[i]
pmargin, ppadding = self.pmargin[i], self.ppadding[i]
cssw = node.width + padding[3] + padding[1] + int(round(node.width * (ppadding[3] + ppadding[1]))) # image width plus padding
cssh = node.height + padding[0] + padding[2] + int(round(node.height * (ppadding[0] + ppadding[2]))) # image height plus padding
cssx = node.x + margin[3] + int(round(node.width * pmargin[3]))
cssy = node.y + margin[0] + int(round(node.height * pmargin[0]))
x = cssx + padding[3] + int(round(node.width * ppadding[3]))
y = cssy + padding[0] + int(round(node.height * ppadding[0]))
yield x, y, node.width, node.height, cssx, cssy, cssw, cssh
@property
def width(self):
return self.root.w
@property
def height(self):
return self.root.h
def _findNode(self, root, w, h):
if root.used:
return self._findNode(root.right, w, h) or self._findNode(root.down, w, h)
elif w <= root.w and h <= root.h:
return root
else:
return None
def _splitNode(self, node, w, h):
node.used = True
node.down = LayoutNode(
x=node.x,
y=node.y + h,
w=node.w,
h=node.h - h
)
node.right = LayoutNode(
x=node.x + w,
y=node.y,
w=node.w - w,
h=h
)
return node
def _growNode(self, root, w, h):
canGrowDown = w <= root.w
canGrowRight = h <= root.h
shouldGrowRight = canGrowRight and (root.h >= root.w + w) # attempt to keep square-ish by growing right when height is much greater than width
shouldGrowDown = canGrowDown and (root.w >= root.h + h) # attempt to keep square-ish by growing down when width is much greater than height
if shouldGrowRight:
return self._growRight(root, w, h)
elif shouldGrowDown:
return self._growDown(root, w, h)
elif canGrowRight:
return self._growRight(root, w, h)
elif canGrowDown:
return self._growDown(root, w, h)
else:
# need to ensure sensible root starting size to avoid this happening
assert False, "Blocks must be properly sorted!"
def _growRight(self, root, w, h):
root = LayoutNode(
used=True,
x=0,
y=0,
w=root.w + w,
h=root.h,
down=root,
right=LayoutNode(
x=root.w,
y=0,
w=w,
h=root.h
)
)
return root
def _growDown(self, root, w, h):
root = LayoutNode(
used=True,
x=0,
y=0,
w=root.w,
h=root.h + h,
down=LayoutNode(
x=0,
y=root.h,
w=root.w,
h=h
),
right=root
)
return root
class HorizontalSpritesLayout(SpritesLayout):
def __init__(self, blocks, padding=None, margin=None, ppadding=None, pmargin=None, position=None):
super(HorizontalSpritesLayout, self).__init__(blocks, padding, margin, ppadding, pmargin)
self.width = sum(block[0] for block in self.blocks)
self.height = max(block[1] for block in self.blocks)
if position is None:
position = [0.0] * self.num_blocks
elif not isinstance(position, (tuple, list)):
position = [position] * self.num_blocks
self.position = position
def __iter__(self):
cx = 0
for i, block in enumerate(self.blocks):
w, h, width, height, i = block
margin, padding = self.margin[i], self.padding[i]
pmargin, ppadding = self.pmargin[i], self.ppadding[i]
position = self.position[i]
cssw = width + padding[3] + padding[1] + int(round(width * (ppadding[3] + ppadding[1]))) # image width plus padding
cssh = height + padding[0] + padding[2] + int(round(height * (ppadding[0] + ppadding[2]))) # image height plus padding
cssx = cx + margin[3] + int(round(width * pmargin[3])) # anchored at x
cssy = int(round((self.height - cssh) * position)) # centered vertically
x = cssx + padding[3] + int(round(width * ppadding[3])) # image drawn offset to account for padding
y = cssy + padding[0] + int(round(height * ppadding[0])) # image drawn offset to account for padding
yield x, y, width, height, cssx, cssy, cssw, cssh
cx += cssw + margin[3] + margin[1] + int(round(width * (pmargin[3] + pmargin[1])))
class VerticalSpritesLayout(SpritesLayout):
def __init__(self, blocks, padding=None, margin=None, ppadding=None, pmargin=None, position=None):
super(VerticalSpritesLayout, self).__init__(blocks, padding, margin, ppadding, pmargin)
self.width = max(block[0] for block in self.blocks)
self.height = sum(block[1] for block in self.blocks)
if position is None:
position = [0.0] * self.num_blocks
elif not isinstance(position, (tuple, list)):
position = [position] * self.num_blocks
self.position = position
def __iter__(self):
cy = 0
for i, block in enumerate(self.blocks):
w, h, width, height, i = block
margin, padding = self.margin[i], self.padding[i]
pmargin, ppadding = self.pmargin[i], self.ppadding[i]
position = self.position[i]
cssw = width + padding[3] + padding[1] + int(round(width * (ppadding[3] + ppadding[1]))) # image width plus padding
cssh = height + padding[0] + padding[2] + int(round(height * (ppadding[0] + ppadding[2]))) # image height plus padding
cssx = int(round((self.width - cssw) * position)) # centered horizontally
cssy = cy + margin[0] + int(round(height * pmargin[0])) # anchored at y
x = cssx + padding[3] + int(round(width * ppadding[3])) # image drawn offset to account for padding
y = cssy + padding[0] + int(round(height * ppadding[0])) # image drawn offset to account for padding
yield x, y, width, height, cssx, cssy, cssw, cssh
cy += cssh + margin[0] + margin[2] + int(round(height * (pmargin[0] + pmargin[2])))
class DiagonalSpritesLayout(SpritesLayout):
def __init__(self, blocks, padding=None, margin=None, ppadding=None, pmargin=None):
super(DiagonalSpritesLayout, self).__init__(blocks, padding, margin, ppadding, pmargin)
self.width = sum(block[0] for block in self.blocks)
self.height = sum(block[1] for block in self.blocks)
def __iter__(self):
cx, cy = 0, 0
for i, block in enumerate(self.blocks):
w, h, width, height, i = block
margin, padding = self.margin[i], self.padding[i]
pmargin, ppadding = self.pmargin[i], self.ppadding[i]
cssw = width + padding[3] + padding[1] + int(round(width * (ppadding[3] + ppadding[1]))) # image width plus padding
cssh = height + padding[0] + padding[2] + int(round(height * (ppadding[0] + ppadding[2]))) # image height plus padding
cssx = cx + margin[3] + int(round(width * pmargin[3])) # anchored at x
cssy = cy + margin[0] + int(round(height * pmargin[0])) # anchored at y
x = cssx + padding[3] + int(round(width * ppadding[3])) # image drawn offset to account for padding
y = cssy + padding[0] + int(round(height * ppadding[0])) # image drawn offset to account for padding
yield x, y, width, height, cssx, cssy, cssw, cssh
cx += cssw + margin[3] + margin[1] + int(round(width * (pmargin[3] + pmargin[1])))
cy += cssh + margin[0] + margin[2] + int(round(height * (pmargin[0] + pmargin[2])))
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