Author: Hakan Ardo <[email protected]>
Branch: extradoc
Changeset: r3761:68c1c8d367c2
Date: 2011-06-21 07:58 +0200
http://bitbucket.org/pypy/extradoc/changeset/68c1c8d367c2/
Log: magnify example from sprint, now with no generator and more decent
performace
diff --git a/talk/iwtc11/benchmarks/image/magnify.py
b/talk/iwtc11/benchmarks/image/magnify.py
new file mode 100644
--- /dev/null
+++ b/talk/iwtc11/benchmarks/image/magnify.py
@@ -0,0 +1,44 @@
+from plain import Image
+from math import atan2, sqrt, sin, cos
+
+def magnify(img):
+ out = Image(img.width, img.height, typecode='B')
+ out.data[:] = img.data
+ maxr = img.height/3
+ for y in xrange(img.height/2 - maxr, img.height/2 + maxr):
+ for x in xrange(img.width/2 - maxr, img.width/2 + maxr):
+ dx, dy = x - img.width/2, y - img.height/2
+ a = atan2(dy, dx)
+ r = sqrt(dx ** 2 + dy ** 2)
+ if r < maxr:
+ nr = r*r / maxr
+ nx, ny = nr*cos(a), nr*sin(a)
+ out[x,y] = img[int(nx) + img.width/2, int(ny) + img.height/2]
+ else:
+ out[x,y] = img[x,y]
+ return out
+
+if __name__ == '__main__':
+ from io import mplayer, view
+ import sys
+ from time import time
+
+ if len(sys.argv) > 1:
+ fn = sys.argv[1]
+ else:
+ fn = 'test.avi -vf scale=640:480 -benchmark'
+
+ sys.setcheckinterval(2**30)
+ try:
+ import pypyjit
+ pypyjit.set_param(trace_limit=200000)
+ except ImportError:
+ pass
+
+ start = start0 = time()
+ for fcnt, img in enumerate(mplayer(Image, fn)):
+ view(magnify(img))
+ print 1.0 / (time() - start), 'fps, ', (fcnt-2) / (time() - start0),
'average fps'
+ start = time()
+ if fcnt==2:
+ start0 = time()
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