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#!/usr/bin/env python
# $URL: http://pypng.googlecode.com/svn/trunk/code/pipscalez $
# $Rev: 131 $
# pipscalez
# Enlarge an image by an integer factor horizontally and vertically.
def rescale(inp, out, xf, yf):
from array import array
import png
r = png.Reader(file=inp)
_,_,pixels,meta = r.asDirect()
typecode = 'BH'[meta['bitdepth'] > 8]
planes = meta['planes']
# We are going to use meta in the call to Writer, so expand the
# size.
x,y = meta['size']
x *= xf
y *= yf
meta['size'] = (x,y)
del x
del y
# Values per row, target row.
vpr = meta['size'][0] * planes
def iterscale():
for row in pixels:
bigrow = array(typecode, [0]*vpr)
row = array(typecode, row)
for c in range(planes):
channel = row[c::planes]
for i in range(xf):
bigrow[i*planes+c::xf*planes] = channel
for _ in range(yf):
yield bigrow
w = png.Writer(**meta)
w.write(out, iterscale())
def main(argv=None):
import sys
if argv is None:
argv = sys.argv
xf = int(argv[1])
if len(argv) > 2:
yf = int(argv[2])
else:
yf = xf
return rescale(sys.stdin, sys.stdout, xf, yf)
if __name__ == '__main__':
main()
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