/usr/lib/python3/dist-packages/matplotlib/tests/test_agg.py is in python3-matplotlib 1.3.1-1ubuntu5.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 | import io
import os
import tempfile
from numpy.testing import assert_array_almost_equal
from matplotlib.image import imread
from matplotlib.backends.backend_agg import FigureCanvasAgg as FigureCanvas
from matplotlib.figure import Figure
from matplotlib.testing.decorators import cleanup
@cleanup
def test_repeated_save_with_alpha():
# We want an image which has a background color of bluish green, with an
# alpha of 0.25.
fig = Figure([1, 0.4])
canvas = FigureCanvas(fig)
fig.set_facecolor((0, 1, 0.4))
fig.patch.set_alpha(0.25)
# The target color is fig.patch.get_facecolor()
buf = io.BytesIO()
fig.savefig(buf,
facecolor=fig.get_facecolor(),
edgecolor='none')
# Save the figure again to check that the
# colors don't bleed from the previous renderer.
buf.seek(0)
fig.savefig(buf,
facecolor=fig.get_facecolor(),
edgecolor='none')
# Check the first pixel has the desired color & alpha
# (approx: 0, 1.0, 0.4, 0.25)
buf.seek(0)
assert_array_almost_equal(tuple(imread(buf)[0, 0]),
(0.0, 1.0, 0.4, 0.250),
decimal=3)
def report_memory(i):
pid = os.getpid()
a2 = os.popen('ps -p %d -o rss,sz' % pid).readlines()
print(i, ' ', a2[1], end=' ')
return int(a2[1].split()[0])
# This test is disabled -- it uses old API. -ADS 2009-09-07
## def test_memleak():
## """Test agg backend for memory leaks."""
## from matplotlib.ft2font import FT2Font
## from numpy.random import rand
## from matplotlib.backend_bases import GraphicsContextBase
## from matplotlib.backends._backend_agg import RendererAgg
## fontname = '/usr/local/share/matplotlib/Vera.ttf'
## N = 200
## for i in range( N ):
## gc = GraphicsContextBase()
## gc.set_clip_rectangle( [20, 20, 20, 20] )
## o = RendererAgg( 400, 400, 72 )
## for j in range( 50 ):
## xs = [ 400*int(rand()) for k in range(8) ]
## ys = [ 400*int(rand()) for k in range(8) ]
## rgb = (1, 0, 0)
## pnts = zip( xs, ys )
## o.draw_polygon( gc, rgb, pnts )
## o.draw_polygon( gc, None, pnts )
## for j in range( 50 ):
## x = [ 400*int(rand()) for k in range(4) ]
## y = [ 400*int(rand()) for k in range(4) ]
## o.draw_lines( gc, x, y )
## for j in range( 50 ):
## args = [ 400*int(rand()) for k in range(4) ]
## rgb = (1, 0, 0)
## o.draw_rectangle( gc, rgb, *args )
## if 1: # add text
## font = FT2Font( fontname )
## font.clear()
## font.set_text( 'hi mom', 60 )
## font.set_size( 12, 72 )
## o.draw_text_image( font.get_image(), 30, 40, gc )
## fname = "agg_memleak_%05d.png"
## o.write_png( fname % i )
## val = report_memory( i )
## if i==1: start = val
## end = val
## avgMem = (end - start) / float(N)
## print 'Average memory consumed per loop: %1.4f\n' % (avgMem)
## #TODO: Verify the expected mem usage and approximate tolerance that should be used
## #self.checkClose( 0.32, avgMem, absTol = 0.1 )
## # w/o text and w/o write_png: Average memory consumed per loop: 0.02
## # w/o text and w/ write_png : Average memory consumed per loop: 0.3400
## # w/ text and w/ write_png : Average memory consumed per loop: 0.32
if __name__ == "__main__":
import nose
nose.runmodule(argv=['-s', '--with-doctest'], exit=False)
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