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# coding: UTF-8
# Copyright 2009, 2010 Thomas Jourdan
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
from gettext import gettext as _
import random
import cairo
import ka_debug
import model_random
import model_allele
import model_constraintpool
# Cairo's compositing operators
# OPERATOR_ADD = 12
# OPERATOR_ATOP = 5
# OPERATOR_CLEAR = 0
# OPERATOR_DEST = 6
# OPERATOR_DEST_ATOP = 10
# OPERATOR_DEST_IN = 8
# OPERATOR_DEST_OUT = 9
# OPERATOR_DEST_OVER = 7
# OPERATOR_IN = 3
# OPERATOR_OUT = 4
# OPERATOR_OVER = 2
# OPERATOR_SATURATE = 13
# OPERATOR_SOURCE = 1
# OPERATOR_XOR = 11
OPERATOR_CONSTRAINT = 'operatorconstraint'
ALPHABLENDING_CONSTRAINT = 'alphaconstraint'
class MaskMerger(model_allele.Allele):
"""MaskMerger
inv: cairo.OPERATOR_CLEAR <= self.left_operator <= cairo.OPERATOR_SATURATE
"""
cdef = [{'bind' : OPERATOR_CONSTRAINT,
'name' : 'Permitted operators for combining two layers',
'domain': model_constraintpool.INT_M_OF_N,
'enum' : [('add', cairo.OPERATOR_ADD),
('atop', cairo.OPERATOR_ATOP),
# not usable ('clear', cairo.OPERATOR_CLEAR),
# not usable ('destination', cairo.OPERATOR_DEST),
('destination atop', cairo.OPERATOR_DEST_ATOP),
('destination in', cairo.OPERATOR_DEST_IN),
('destination out', cairo.OPERATOR_DEST_OUT),
# not usable ('destination over', cairo.OPERATOR_DEST_OVER),
# not usable ('in', cairo.OPERATOR_IN),
('out', cairo.OPERATOR_OUT),
('over', cairo.OPERATOR_OVER),
# not usable ('saturate', cairo.OPERATOR_SATURATE),
('source', cairo.OPERATOR_SOURCE),
('xor', cairo.OPERATOR_XOR),],},
{'bind' : ALPHABLENDING_CONSTRAINT,
'name' : 'Alpha blending for combining layers.',
'domain': model_constraintpool.FLOAT_RANGE,
'min' : 0.75, 'max': 1.0},
]
OPERATORS = [o[1] for o in cdef[0]['enum']]
OPERATOR_NAMES = {}
for o in cdef[0]['enum']:
OPERATOR_NAMES[o[1]] = o[0]
def __init__(self, trunk):
"""Constructor for a simple merger."""
super(MaskMerger, self).__init__(trunk)
self.left_operator = cairo.OPERATOR_ADD
self.left_alphablending = 1.0
def __eq__(self, other):
"""Randomize the mergers components."""
equal = isinstance(other, MaskMerger) \
and self.left_operator == other.left_operator \
and self.left_alphablending == other.left_alphablending
return equal
def randomize(self):
"""No member variables. Nothing to do."""
cpool = model_constraintpool.ConstraintPool.get_pool()
operator_constraint = cpool.get(self, OPERATOR_CONSTRAINT)
self.left_operator = random.choice(operator_constraint)
alphablending_constraint = cpool.get(self, ALPHABLENDING_CONSTRAINT)
self.left_alphablending = \
model_random.uniform_constrained(alphablending_constraint)
def mutate(self):
"""Make random changes to the layers components."""
cpool = model_constraintpool.ConstraintPool.get_pool()
operator_constraint = cpool.get(self, OPERATOR_CONSTRAINT)
if model_random.is_mutating():
self.left_operator = random.choice(operator_constraint)
alphablending_constraint = cpool.get(self, ALPHABLENDING_CONSTRAINT)
self.left_alphablending = \
model_random.jitter_constrained(self.left_alphablending, \
alphablending_constraint)
def swap_places(self):
"""Shuffle similar components."""
pass
def crossingover(self, other):
"""
pre: isinstance(self, MaskMerger)
pre: isinstance(other, MaskMerger)
# check for distinct references, needs to copy content, not references
post: __return__ is not self
"""
new_one = MaskMerger(self.get_trunk())
crossing = model_random.crossing_sequence(4)
new_one.left_operator = other.left_operator if crossing[0] \
else self.left_operator
new_one.left_alphablending = other.left_alphablending if crossing[2] \
else self.left_alphablending
return new_one
def merge_layers(self, left_surface, right_surface, ctx, width, height):
"""
pre: left_surface is not None
pre: right_surface is not None
pre: ctx is not None
pre: width > 0
pre: height > 0
pre: width == height
"""
ctx.save()
# ka_debug.matrix_s(ctx.get_matrix())
# draw 'left' layer using 'right' layer as mask
ctx.set_operator(self.left_operator)
ctx.translate(-0.5, -0.5)
# ka_debug.matrix(ctx.get_matrix())
ctx.scale(1.0/width, 1.0/height)
# ka_debug.matrix(ctx.get_matrix())
ctx.mask_surface(right_surface, 0, 0)
# ka_debug.matrix_r(ctx.get_matrix())
ctx.set_source_surface(left_surface)
# ka_debug.matrix(ctx.get_matrix())
ctx.paint_with_alpha(self.left_alphablending) # 0.5 .. 1.0
# ka_debug.matrix_r(ctx.get_matrix())
ctx.restore()
def explain_left(self, formater):
formater.text_item(_('Compositing drawing operator for left node: ') \
+ self.OPERATOR_NAMES[self.left_operator])
formater.text_item(_('Alpha blending of left node: ') \
+ str(self.left_alphablending))
def explain_right(self, formater):
formater.text_item(_('Compositing used right node as a mask surface.'))
def copy(self):
"""A copy constructor.
post: isinstance(__return__, MaskMerger)
# check for distinct references, needs to copy content, not references
post: __return__ is not self
"""
new_one = MaskMerger(self.get_trunk())
new_one.left_operator = self.left_operator
new_one.left_alphablending = self.left_alphablending
return new_one
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