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Copy pathcompositing_test.py
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289 lines (257 loc) · 11.4 KB
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import os
import mapnik
import pytest
from .utilities import (get_unique_colors, pixel2channels, side_by_side_image, execution_path)
@pytest.fixture(scope="module")
def setup():
# All of the paths used are relative, if we run the tests
# from another directory we need to chdir()
os.chdir(execution_path('.'))
yield
def is_pre(color, alpha):
return (color * 255.0 / alpha) <= 255
def debug_image(image, step=2):
for x in range(0, image.width(), step):
for y in range(0, image.height(), step):
pixel = image.get_pixel(x, y)
red, green, blue, alpha = pixel2channels(pixel)
print(
"rgba(%s,%s,%s,%s) at %s,%s" %
(red, green, blue, alpha, x, y))
def replace_style(m, name, style):
m.remove_style(name)
m.append_style(name, style)
# note: it is impossible to know for all pixel colors
# we can only detect likely cases of non premultiplied colors
def validate_pixels_are_not_premultiplied(image):
over_alpha = False
transparent = True
fully_opaque = True
for x in range(0, image.width(), 2):
for y in range(0, image.height(), 2):
pixel = image.get_pixel(x, y)
red, green, blue, alpha = pixel2channels(pixel)
if alpha > 0:
transparent = False
if alpha < 255:
fully_opaque = False
color_max = max(red, green, blue)
if color_max > alpha:
over_alpha = True
return over_alpha or transparent or fully_opaque
def validate_pixels_are_not_premultiplied2(image):
looks_not_multiplied = False
for x in range(0, image.width(), 2):
for y in range(0, image.height(), 2):
pixel = image.get_pixel(x, y)
red, green, blue, alpha = pixel2channels(pixel)
# each value of the color channels will never be bigger than that
# of the alpha channel.
if alpha > 0:
if red > 0 and red > alpha:
print('red: %s, a: %s' % (red, alpha))
looks_not_multiplied = True
return looks_not_multiplied
def validate_pixels_are_premultiplied(image):
bad_pixels = []
for x in range(0, image.width(), 2):
for y in range(0, image.height(), 2):
pixel = image.get_pixel(x, y)
red, green, blue, alpha = pixel2channels(pixel)
if alpha > 0:
pixel = image.get_pixel(x, y)
is_valid = ((0 <= red <= alpha) and is_pre(red, alpha)) \
and ((0 <= green <= alpha) and is_pre(green, alpha)) \
and ((0 <= blue <= alpha) and is_pre(blue, alpha)) \
and (alpha >= 0 and alpha <= 255)
if not is_valid:
bad_pixels.append(
"rgba(%s,%s,%s,%s) at %s,%s" %
(red, green, blue, alpha, x, y))
num_bad = len(bad_pixels)
return (num_bad == 0, bad_pixels)
def test_compare_images(setup):
b = mapnik.Image.open('images/support/b.png')
b.premultiply()
num_ops = len(mapnik.CompositeOp.__members__)
successes = []
fails = []
for name in mapnik.CompositeOp.__members__.keys():
a = mapnik.Image.open('images/support/a.png')
a.premultiply()
a.composite(b, getattr(mapnik.CompositeOp, name))
actual = '/tmp/mapnik-comp-op-test-' + name + '.png'
expected = 'images/composited/' + name + '.png'
valid = validate_pixels_are_premultiplied(a)
if not valid[0]:
fails.append(
'%s not validly premultiplied!:\n\t %s pixels (%s)' %
(name, len(
valid[1]), valid[1][0]))
a.demultiply()
if not validate_pixels_are_not_premultiplied(a):
fails.append('%s not validly demultiplied' % (name))
a.save(actual, 'png32')
if not os.path.exists(expected) or os.environ.get('UPDATE'):
print('generating expected test image: %s' % expected)
a.save(expected, 'png32')
expected_im = mapnik.Image.open(expected)
# compare them
if a.to_string('png32') == expected_im.to_string('png32'):
successes.append(name)
else:
fails.append(
'failed comparing actual (%s) and expected(%s)' %
(actual, 'tests/python_tests/' + expected))
fail_im = side_by_side_image(expected_im, a)
fail_im.save(
'/tmp/mapnik-comp-op-test-' +
name +
'.fail.png',
'png32')
assert len(successes) == num_ops, '\n' + '\n'.join(fails)
b.demultiply()
# b will be slightly modified by pre and then de multiplication rounding errors
# TODO - write test to ensure the image is 99% the same.
#expected_b = mapnik.Image.open('./images/support/b.png')
# b.save('/tmp/mapnik-comp-op-test-original-mask.png')
#assert b.to_string('png32') == expected_b.to_string('png32'), '/tmp/mapnik-comp-op-test-original-mask.png is no longer equivalent to original mask: ./images/support/b.png'
def test_pre_multiply_status():
b = mapnik.Image.open('images/support/b.png')
# not premultiplied yet, should appear that way
result = validate_pixels_are_not_premultiplied(b)
assert result
# not yet premultiplied therefore should return false
result = validate_pixels_are_premultiplied(b)
assert not result[0]
# now actually premultiply the pixels
b.premultiply()
# now checking if premultiplied should succeed
result = validate_pixels_are_premultiplied(b)
assert result[0]
# should now not appear to look not premultiplied
result = validate_pixels_are_not_premultiplied(b)
assert not result
# now actually demultiply the pixels
b.demultiply()
# should now appear demultiplied
result = validate_pixels_are_not_premultiplied(b)
assert result
def test_pre_multiply_status_of_map1():
m = mapnik.Map(256, 256)
im = mapnik.Image(m.width, m.height)
assert validate_pixels_are_not_premultiplied(im)
mapnik.render(m, im)
assert validate_pixels_are_not_premultiplied(im)
def test_pre_multiply_status_of_map2():
m = mapnik.Map(256, 256)
m.background = mapnik.Color(1, 1, 1, 255)
im = mapnik.Image(m.width, m.height)
assert validate_pixels_are_not_premultiplied(im)
mapnik.render(m, im)
assert validate_pixels_are_not_premultiplied(im)
if 'shape' in mapnik.DatasourceCache.plugin_names():
def test_style_level_comp_op():
m = mapnik.Map(256, 256)
mapnik.load_map(m, '../data/good_maps/style_level_comp_op.xml')
m.zoom_all()
successes = []
fails = []
for name in mapnik.CompositeOp.__members__.keys():
# find_style returns a copy of the style object
style_markers = m.find_style("markers")
style_markers.comp_op = getattr(mapnik.CompositeOp, name)
# replace the original style with the modified one
replace_style(m, "markers", style_markers)
im = mapnik.Image(m.width, m.height)
mapnik.render(m, im)
actual = '/tmp/mapnik-style-comp-op-' + name + '.png'
expected = 'images/style-comp-op/' + name + '.png'
im.save(actual, 'png32')
if not os.path.exists(expected) or os.environ.get('UPDATE'):
print('generating expected test image: %s' % expected)
im.save(expected, 'png32')
expected_im = mapnik.Image.open(expected)
# compare them
if im.to_string('png32') == expected_im.to_string('png32'):
successes.append(name)
else:
fails.append(
'failed comparing actual (%s) and expected(%s)' %
(actual, 'tests/python_tests/' + expected))
fail_im = side_by_side_image(expected_im, im)
fail_im.save(
'/tmp/mapnik-style-comp-op-' +
name +
'.fail.png',
'png32')
assert len(fails) == 0, '\n' + '\n'.join(fails)
def test_style_level_opacity():
m = mapnik.Map(512, 512)
mapnik.load_map(
m, '../data/good_maps/style_level_opacity_and_blur.xml')
m.zoom_all()
im = mapnik.Image(512, 512)
mapnik.render(m, im)
actual = '/tmp/mapnik-style-level-opacity.png'
expected = 'images/support/mapnik-style-level-opacity.png'
im.save(actual, 'png32')
expected_im = mapnik.Image.open(expected)
assert im.to_string('png32') == expected_im.to_string('png32'), 'failed comparing actual (%s) and expected (%s)' % (actual,
'tests/python_tests/' + expected)
def test_rounding_and_color_expectations():
m = mapnik.Map(1, 1)
m.background = mapnik.Color('rgba(255,255,255,.4999999)')
im = mapnik.Image(m.width, m.height)
mapnik.render(m, im)
assert get_unique_colors(im) == ['rgba(255,255,255,127)']
m = mapnik.Map(1, 1)
m.background = mapnik.Color('rgba(255,255,255,.5)')
im = mapnik.Image(m.width, m.height)
mapnik.render(m, im)
assert get_unique_colors(im) == ['rgba(255,255,255,128)']
im_file = mapnik.Image.open('../data/images/stripes_pattern.png')
assert get_unique_colors(im_file) == ['rgba(0,0,0,0)', 'rgba(74,74,74,255)']
# should have no effect
im_file.premultiply()
assert get_unique_colors(im_file) == ['rgba(0,0,0,0)', 'rgba(74,74,74,255)']
im_file.apply_opacity(.5)
# should have effect now that image has transparency
im_file.premultiply()
assert get_unique_colors(im_file) == ['rgba(0,0,0,0)', 'rgba(37,37,37,127)']
# should restore to original nonpremultiplied colors
im_file.demultiply()
assert get_unique_colors(im_file) == ['rgba(0,0,0,0)', 'rgba(74,74,74,127)']
def test_background_image_and_background_color():
m = mapnik.Map(8, 8)
m.background = mapnik.Color('rgba(255,255,255,.5)')
m.background_image = '../data/images/stripes_pattern.png'
im = mapnik.Image(m.width, m.height)
mapnik.render(m, im)
assert get_unique_colors(im) == ['rgba(255,255,255,128)', 'rgba(74,74,74,255)']
def test_background_image_with_alpha_and_background_color():
m = mapnik.Map(10, 10)
m.background = mapnik.Color('rgba(255,255,255,.5)')
m.background_image = '../data/images/yellow_half_trans.png'
im = mapnik.Image(m.width, m.height)
mapnik.render(m, im)
assert get_unique_colors(im) == ['rgba(255,255,85,191)']
def test_background_image_with_alpha_and_background_color_against_composited_control():
m = mapnik.Map(10, 10)
m.background = mapnik.Color('rgba(255,255,255,.5)')
m.background_image = '../data/images/yellow_half_trans.png'
im = mapnik.Image(m.width, m.height)
mapnik.render(m, im)
# create and composite the expected result
im1 = mapnik.Image(10, 10)
im1.fill(mapnik.Color('rgba(255,255,255,.5)'))
im1.premultiply()
im2 = mapnik.Image(10, 10)
im2.fill(mapnik.Color('rgba(255,255,0,.5)'))
im2.premultiply()
im1.composite(im2)
im1.demultiply()
# compare image rendered (compositing in `agg_renderer<T>::setup`)
# vs image composited via python bindings
#raise Todo("looks like we need to investigate PNG color rounding when saving")
#assert get_unique_colors(im) == get_unique_colors(im1)
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