Revision 634f24b487c5e8036f1c1c977686b9d5eb41e6e8 authored by Juergen E. Fischer on 08 July 2016, 12:00:33 UTC, committed by Juergen E. Fischer on 08 July 2016, 12:00:33 UTC
1 parent 6f82713
generate_test_mask_image.py
#!/usr/bin/env python
# Generates (or updates) a unit test image mask, which is used to specify whether
# a pixel in the control image should be checked (black pixel in mask) or not (white
# pixel in mask). For non black or white pixels, the pixels lightness is used to
# specify a maximum delta for each color component
import os
import sys
import argparse
from PyQt4.QtCore import *
from PyQt4.QtGui import *
import struct
import urllib2
import glob
def error(msg):
print msg
sys.exit(1)
def colorDiff(c1, c2):
redDiff = abs(qRed(c1) - qRed(c2))
greenDiff = abs(qGreen(c1) - qGreen(c2))
blueDiff = abs(qBlue(c1) - qBlue(c2))
alphaDiff = abs(qAlpha(c1) - qAlpha(c2))
return max(redDiff, greenDiff, blueDiff, alphaDiff)
def imageFromPath(path):
if (path[:7] == 'http://' or path[:7] == 'file://'):
#fetch remote image
data = urllib2.urlopen(path).read()
image = QImage()
image.loadFromData(data)
else:
image = QImage(path)
return image
def getControlImagePath(path):
if os.path.isfile(path):
return path
#else try and find matching test image
script_folder = os.path.dirname(os.path.realpath(sys.argv[0]))
control_images_folder = os.path.join(script_folder, '../tests/testdata/control_images')
matching_control_images = [x[0] for x in os.walk(control_images_folder) if path in x[0]]
if len(matching_control_images) > 1:
error('Found multiple matching control images for {}'.format(path))
elif len(matching_control_images) == 0:
error('No matching control images found for {}'.format(path))
found_control_image_path = matching_control_images[0]
#check for a single matching expected image
images = glob.glob(os.path.join(found_control_image_path, '*.png'))
filtered_images = [i for i in images if not i[-9:] == '_mask.png']
if len(filtered_images) > 1:
error('Found multiple matching control images for {}'.format(path))
elif len(filtered_images) == 0:
error('No matching control images found for {}'.format(path))
found_image = filtered_images[0]
print 'Found matching control image: {}'.format(found_image)
return found_image
def updateMask(control_image_path, rendered_image_path, mask_image_path):
control_image = imageFromPath(control_image_path)
if not control_image:
error('Could not read control image {}'.format(control_image_path))
rendered_image = imageFromPath(rendered_image_path)
if not rendered_image:
error('Could not read rendered image {}'.format(rendered_image_path))
if not rendered_image.width() == control_image.width() or not rendered_image.height() == control_image.height():
print ('Size mismatch - control image is {}x{}, rendered image is {}x{}'.format(control_image.width(),
control_image.height(),
rendered_image.width(),
rendered_image.height()))
max_width = min(rendered_image.width(), control_image.width())
max_height = min(rendered_image.height(), control_image.height())
#read current mask, if it exist
mask_image = imageFromPath(mask_image_path)
if mask_image.isNull():
print 'Mask image does not exist, creating {}'.format(mask_image_path)
mask_image = QImage(control_image.width(), control_image.height(), QImage.Format_ARGB32)
mask_image.fill(QColor(0, 0, 0))
#loop through pixels in rendered image and compare
mismatch_count = 0
linebytes = max_width * 4
for y in xrange(max_height):
control_scanline = control_image.constScanLine(y).asstring(linebytes)
rendered_scanline = rendered_image.constScanLine(y).asstring(linebytes)
mask_scanline = mask_image.scanLine(y).asstring(linebytes)
for x in xrange(max_width):
currentTolerance = qRed(struct.unpack('I', mask_scanline[x * 4:x * 4 + 4])[0])
if currentTolerance == 255:
#ignore pixel
continue
expected_rgb = struct.unpack('I', control_scanline[x * 4:x * 4 + 4])[0]
rendered_rgb = struct.unpack('I', rendered_scanline[x * 4:x * 4 + 4])[0]
difference = colorDiff(expected_rgb, rendered_rgb)
if difference > currentTolerance:
#update mask image
mask_image.setPixel(x, y, qRgb(difference, difference, difference))
mismatch_count += 1
if mismatch_count:
#update mask
mask_image.save(mask_image_path, "png")
print 'Updated {} pixels in {}'.format(mismatch_count, mask_image_path)
else:
print 'No mismatches in {}'.format(mask_image_path)
parser = argparse.ArgumentParser() # OptionParser("usage: %prog control_image rendered_image mask_image")
parser.add_argument('control_image')
parser.add_argument('rendered_image')
parser.add_argument('mask_image', nargs='?', default=None)
args = parser.parse_args()
args.control_image = getControlImagePath(args.control_image)
if not args.mask_image:
args.mask_image = args.control_image[:-4] + '_mask.png'
updateMask(args.control_image, args.rendered_image, args.mask_image)
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