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)
eq_(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)
eq_(get_unique_colors(im),['rgba(255,255,85,191)'])
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)
eq_(get_unique_colors(im), ['rgba(255,255,85,191)'])
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)
eq_(get_unique_colors(im),['rgba(255,255,255,128)', 'rgba(74,74,74,255)'])
def test_raster_with_alpha_blends_correctly_with_background():
WIDTH = 500
HEIGHT = 500
map = mapnik.Map(WIDTH, HEIGHT)
WHITE = mapnik.Color(255, 255, 255)
map.background = WHITE
style = mapnik.Style()
rule = mapnik.Rule()
symbolizer = mapnik.RasterSymbolizer()
symbolizer.scaling = mapnik.scaling_method.BILINEAR
rule.symbols.append(symbolizer)
style.rules.append(rule)
map.append_style('raster_style', style)
map_layer = mapnik.Layer('test_layer')
filepath = '../data/raster/white-alpha.png'
if 'gdal' in mapnik.DatasourceCache.plugin_names():
map_layer.datasource = mapnik.Gdal(file=filepath)
map_layer.styles.append('raster_style')
map.layers.append(map_layer)
map.zoom_all()
mim = mapnik.Image(WIDTH, HEIGHT)
mapnik.render(map, mim)
imdata = mim.tostring()
# All white is expected
eq_(get_unique_colors(mim),['rgba(254,254,254,255)'])
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.background = mapnik.Color('rgba(255,255,255,.5)')
im1.premultiply()
im2 = mapnik.Image(10,10)
im2.background = 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 rounding when saving")
eq_(get_unique_colors(im),get_unique_colors(im1))
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)
# note: data loss due to rounding as per https://github.com/mapnik/mapnik/issues/1519
# means that background will roundtrip to 253 not 255
#eq_(get_unique_colors(im),['rgba(255,255,255,128)', 'rgba(74,74,74,255)'])
eq_(get_unique_colors(im),['rgba(253,253,253,128)', 'rgba(74,74,74,255)'])
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)
# note: data loss due to rounding as per https://github.com/mapnik/mapnik/issues/1519
# means that background will roundtrip to 253 not 255
#eq_(get_unique_colors(im),['rgba(255,255,255,128)', 'rgba(74,74,74,255)'])
eq_(get_unique_colors(im),['rgba(253,253,253,128)', 'rgba(74,74,74,255)'])
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.background = mapnik.Color('rgba(255,255,255,.5)')
im1.premultiply()
im2 = mapnik.Image(10, 10)
im2.background = 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 rounding when saving")
eq_(get_unique_colors(im), get_unique_colors(im1))
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)
eq_(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)
eq_(get_unique_colors(im), ['rgba(255,255,255,128)'])
im_file = mapnik.Image.open('../data/images/stripes_pattern.png')
eq_(get_unique_colors(im_file), ['rgba(0,0,0,0)', 'rgba(74,74,74,255)'])
# should have no effect
im_file.premultiply()
eq_(get_unique_colors(im_file), ['rgba(0,0,0,0)', 'rgba(74,74,74,255)'])
im_file.set_alpha(.5)
# should have effect now that image has transparency
im_file.premultiply()
eq_(get_unique_colors(im_file), ['rgba(0,0,0,0)', 'rgba(37,37,37,127)'])
# should restore to original nonpremultiplied colors
im_file.demultiply()
eq_(get_unique_colors(im_file), ['rgba(0,0,0,0)', 'rgba(74,74,74,127)'])
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)
eq_(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)
eq_(get_unique_colors(im),['rgba(255,255,255,128)'])
im_file = mapnik.Image.open('../data/images/stripes_pattern.png')
eq_(get_unique_colors(im_file),['rgba(0,0,0,0)', 'rgba(74,74,74,255)'])
# should have no effect
im_file.premultiply()
eq_(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()
eq_(get_unique_colors(im_file),['rgba(0,0,0,0)', 'rgba(37,37,37,127)'])
# should restore to original nonpremultiplied colors
im_file.demultiply()
eq_(get_unique_colors(im_file),['rgba(0,0,0,0)', 'rgba(74,74,74,127)'])
def test_set_color_to_alpha():
im = mapnik.Image(256,256)
im.fill(mapnik.Color('rgba(12,12,12,255)'))
eq_(get_unique_colors(im), ['rgba(12,12,12,255)'])
im.set_color_to_alpha(mapnik.Color('rgba(12,12,12,0)'))
eq_(get_unique_colors(im), ['rgba(0,0,0,0)'])
def test_set_color_to_alpha():
im = mapnik.Image(256, 256)
im.fill(mapnik.Color('rgba(12,12,12,255)'))
eq_(get_unique_colors(im), ['rgba(12,12,12,255)'])
im.set_color_to_alpha(mapnik.Color('rgba(12,12,12,0)'))
eq_(get_unique_colors(im), ['rgba(0,0,0,0)'])
