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