def blendWeights(weights1, weights2, factor1 = 1, factor2 = 1): factor1 *= sum(weights2) factor2 *= sum(weights1) return simplifyWeights( factor1 * w1 + factor2 * w2 for w1, w2 in izip(weights1, weights2) )
def blendWeights(weights1, weights2, factor1 = 1, factor2 = 1): factor1 *= sum(weights2) factor2 *= sum(weights1) return simplifyWeights( factor1 * w1 + factor2 * w2 for w1, w2 in zip(weights1, weights2) )
def convertExpr4to2(case, expr4):
weights2 = [0] * 4
for weights4 in expr4:
for neighbour, weight in enumerate(scaleWeights(weights4, 256)):
weights2[neighbour] += weight
weights2 = simplifyWeights(weights2)
if ((case >> 4) & 15) in (2, 6, 8, 12):
assert sorted(weights2) == [0, 2, 7, 23]
weightMap = { 0: 0, 2: 1, 7: 1, 23: 2 }
elif ((case >> 4) & 15) in (0, 1, 4, 5):
assert sorted(weights2) == [0, 3, 3, 10]
weightMap = { 0: 0, 3: 1, 10: 2 }
else:
weightMap = None
if weightMap:
weights2 = tuple(weightMap[weight] for weight in weights2)
return [weights2]
def lighten(case, weights, neighbourPreference): equalNeighboursOf = neighbourToSet[case] if equalNeighboursOf is None: return None else: done = set() newWeights = [ 0 ] * 9 for neighbour in neighbourPreference: if neighbour not in done: equalNeighbours = equalNeighboursOf[neighbour] newWeights[neighbour] = sum( weights[n] for n in equalNeighbours ) done |= equalNeighbours for c in (0, 1, 2, 6, 7, 8): # Only c4, c5, c6 have non-zero weight. assert newWeights[c] == 0 return simplifyWeights(newWeights)
for expr in [[expr[subPixel] for subPixel in quadrantMap]
for expr in pixelExpr]:
for weights in expr:
for neighbour in (2, 5, 6, 7, 8):
assert weights[neighbour] == 0, weights
return [[
extractTopLeftWeights(expr[subPixel]) for subPixel in quadrantMap
] for expr in pixelExpr]
def convertExpr4to2(case, expr4):
weights2 = [0] * 4
for weights4 in expr4:
for neighbour, weight in enumerate(scaleWeights(weights4, 256)):
weights2[neighbour] += weight
weights2 = simplifyWeights(weights2)
if ((case >> 4) & 15) in (2, 6, 8, 12):
assert sorted(weights2) == [0, 2, 7, 23]
weightMap = {0: 0, 2: 1, 7: 1, 23: 2}
elif ((case >> 4) & 15) in (0, 1, 4, 5):
assert sorted(weights2) == [0, 3, 3, 10]
weightMap = {0: 0, 3: 1, 10: 2}
else:
weightMap = None
if weightMap:
weights2 = tuple(weightMap[weight] for weight in weights2)
return [weights2]
def convert4to2(topLeftQuadrant4):
return [
if equalNeighboursOf is None: return None else: done = set() newWeights = [ 0 ] * 9 for neighbour in neighbourPreference: if neighbour not in done: equalNeighbours = equalNeighboursOf[neighbour] newWeights[neighbour] = sum( weights[n] for n in equalNeighbours ) done |= equalNeighbours for c in (0, 1, 2, 6, 7, 8): # Only c4, c5, c6 have non-zero weight. assert newWeights[c] == 0 return simplifyWeights(newWeights) def makeLite(pixelExpr, biased): zoom = getZoom(pixelExpr) biasLeft = (4, 3, 5, 1, 7, 0, 2, 6, 8) biasRight = (4, 5, 3, 1, 7, 2, 0, 8, 6) if biased: center = (zoom - 1) / 2 neighbourPreferences = [ biasRight if subPixel % zoom > center else biasLeft for subPixel in range(zoom ** 2) ] else: neighbourPreferences = [ biasLeft ] * (zoom ** 2) return [ [ lighten(case, weights, pref)
