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# -*- coding: utf-8 -*-
# Copyright (c) Vispy Development Team. All Rights Reserved.
# Distributed under the (new) BSD License. See LICENSE.txt for more info.
import numpy as np
from numpy.testing import assert_array_equal, assert_allclose
from os import path as op
import warnings
from vispy.io import load_crate, imsave, imread, read_png, write_png
from vispy.testing import requires_img_lib, run_tests_if_main
from vispy.util import _TempDir
temp_dir = _TempDir()
def test_make_png():
"""Test to ensure that make_png functions correctly."""
# Save random RGBA and RGB arrays onto disk as PNGs using make_png.
# Read them back with an image library and check whether the array
# saved is equal to the array read.
# Create random RGBA array as type ubyte
rgba_save = np.random.randint(256, size=(100, 100, 4)).astype(np.ubyte)
# Get rid of the alpha for RGB
rgb_save = rgba_save[:, :, :3]
# Output file should be in temp
png_out = op.join(temp_dir, 'random.png')
# write_png implicitly tests _make_png
for rgb_a in (rgba_save, rgb_save):
write_png(png_out, rgb_a)
rgb_a_read = read_png(png_out)
assert_array_equal(rgb_a, rgb_a_read)
@requires_img_lib()
def test_read_write_image():
"""Test reading and writing of images"""
fname = op.join(temp_dir, 'out.png')
im1 = load_crate()
imsave(fname, im1, format='png')
with warnings.catch_warnings(record=True): # PIL unclosed file
im2 = imread(fname)
assert_allclose(im1, im2)
run_tests_if_main()
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