from __future__ import (absolute_import, division, print_function,

unicode_literals)

import six

import io

import os

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)