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# -*- coding: utf-8 -*-
import sys
import mapnik
COMPUTE_THRESHOLD = 16
errors = []
passed = 0
# returns true if pixels are not identical
def compare_pixels(pixel1, pixel2):
if pixel1 == pixel2:
return False
r_diff = abs((pixel1 & 0xff) - (pixel2 & 0xff))
g_diff = abs(((pixel1 >> 8) & 0xff) - ((pixel2 >> 8) & 0xff))
b_diff = abs(((pixel1 >> 16) & 0xff)- ((pixel2 >> 16) & 0xff))
a_diff = abs(((pixel1 >> 24) & 0xff) - ((pixel2 >> 24) & 0xff))
if(r_diff > COMPUTE_THRESHOLD or
g_diff > COMPUTE_THRESHOLD or
b_diff > COMPUTE_THRESHOLD or
a_diff > COMPUTE_THRESHOLD):
return True
else:
return False
# compare two images and return number of different pixels
def compare(actual, expected):
global errors
global passed
im1 = mapnik.Image.open(actual)
try:
im2 = mapnik.Image.open(expected)
except RuntimeError:
errors.append((None, actual, expected))
return -1
diff = 0
pixels = im1.width() * im1.height()
delta_pixels = (im2.width() * im2.height()) - pixels
if delta_pixels != 0:
errors.append((delta_pixels, actual, expected))
return delta_pixels
for x in range(0,im1.width(),2):
for y in range(0,im1.height(),2):
if compare_pixels(im1.get_pixel(x,y),im2.get_pixel(x,y)):
diff += 1
if diff != 0:
errors.append((diff, actual, expected))
passed += 1
return diff
def summary(generate=False):
global errors
global passed
print "-"*80
print "Visual text rendering summary:",
if len(errors) != 0:
for error in errors:
if (error[0] is None):
if generate:
actual = open(error[1],'r').read()
open(error[2],'wb').write(actual)
print "Generating reference image: '%s'" % error[2]
continue
else:
print "Could not verify %s: No reference image found!" % error[1]
else:
print "Failed: %d different pixels:\n\t%s (actual)\n\t%s (expected)" % error
sys.exit(1)
else:
print 'All %s tests passed: \x1b[1;32m✓ \x1b[0m' % passed
sys.exit(0)
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