def testConvertResizedSmallKeepRatio(self):
# Verify that for an original red rectangular (vertically long image),
# after conversion to a square size with blue background the output image
# looks correct based on sampling color at several locations.
orig_img = Image.new('RGBA', (50, 500), self.red_rgb)
conversion_settings = convert.ImageConvertSettings(
'png', 100, 100, bg_color_rgb=self.blue_rgb)
# Final image should be a 10px wide by 100px tall rectangle centered
# within the square, i.e., with center at pixel (49, 49) and borders of
# 45 pixels on each side.
image_converter = convert.ImageConverter(orig_img, conversion_settings)
converted_img = image_converter.convert()
# Just compare the RGB values, not opacity
# Center should be red
self.assertEqual(converted_img.getpixel((45, 45))[0:3], self.red_rgb)
# Top Center should be red
self.assertEqual(converted_img.getpixel((45, 0))[0:3], self.red_rgb)
# Bottom Center should be red
self.assertEqual(converted_img.getpixel((45, 99))[0:3], self.red_rgb)
# Top left edge border should be blue background, then red rect.
self.assertEqual(converted_img.getpixel((44, 0))[0:3], self.blue_rgb)
self.assertEqual(converted_img.getpixel((45, 0))[0:3], self.red_rgb)
# Bottom right edge border should be red, then blue background.
self.assertEqual(converted_img.getpixel((54, 99))[0:3], self.red_rgb)
self.assertEqual(converted_img.getpixel((55, 99))[0:3], self.blue_rgb)
def testConvertTruncatedImage(self):
# Should fail with a message that image is truncated.
# To test image truncation, we actually need to write a file to disk.
img_filepath = os.path.join(self.testdata_dir, 'test_img.png')
try:
orig_img = Image.new('RGBA', (500, 500), self.orange_rgb)
orig_img.save(img_filepath)
filesize = os.path.getsize(img_filepath)
with open(img_filepath, 'r+') as img_on_disk:
img_on_disk.truncate(filesize - 100)
img_truncated = Image.open(img_filepath)
image_converter = convert.ImageConverter(img_truncated,
self.conversion_settings)
with self.assertRaises(IOError) as e:
image_converter.convert()
self.assertTrue('truncated' in str(e.exception).lower())
except:
raise
finally:
# Cleanup.
if os.path.isfile(img_filepath):
os.remove(img_filepath)
def testConvertSmallerIgnoreRatioCropTopLeftNoAspectRatio(self):
# Verify that we get the desired output image when cropping from top left.
# In this case, the aspect ratio of the output image is different than
# that of the orig image so cropping occurs.
# Orig image is a 4 quadrant (200, 200) pixel image, with colors
# (orange, red, green, yellow) starting from top left and going clockwise.
orig_img = Image.new('RGBA', (200, 200), self.yellow_rgb)
orig_img.paste(Image.new('RGBA', (100, 100), self.orange_rgb), (0, 0))
orig_img.paste(Image.new('RGBA', (100, 100), self.red_rgb), (100, 0))
orig_img.paste(Image.new('RGBA', (100, 100), self.green_rgb),
(100, 100))
# Note that in this case, the aspect ratio has changed.
conversion_settings = convert.ImageConvertSettings(
'png',
width=20,
height=200,
position=(0, 0),
preserve_aspect_ratio=False)
# Output image should be 20x200 that only contains the orange and yellow
# sections since we crop from the left.
image_converter = convert.ImageConverter(orig_img, conversion_settings)
converted_img = image_converter.convert()
# Top left of output image should be orange.
self.assertEqual(converted_img.getpixel((0, 0))[0:3], self.orange_rgb)
# Top right should be orange
self.assertEqual(converted_img.getpixel((19, 0))[0:3], self.orange_rgb)
# Bottom right should be yellow
self.assertEqual(
converted_img.getpixel((19, 199))[0:3], self.yellow_rgb)
# Bottom left should be yellow
self.assertEqual(
converted_img.getpixel((0, 199))[0:3], self.yellow_rgb)
def testConvertSmallerRightPosKeepRatio(self):
# Same as above but we specify that the position remains in the right.
# Verify that for an original red rectangular (vertically long image),
# after conversion to a square size with blue background the output image
# looks correct based on sampling color at several locations.
orig_img = Image.new('RGBA', (50, 500), self.red_rgb)
conversion_settings = convert.ImageConvertSettings(
'png', 100, 100, position=(1, 0.5), bg_color_rgb=self.blue_rgb)
# Final image should be a 10px wide by 100px tall rectangle flush with
# the right edge of the output size. I.e., rectangle with center at pixel
# (94, 49) and the blue background staring at x position 9.
image_converter = convert.ImageConverter(orig_img, conversion_settings)
converted_img = image_converter.convert()
# Just compare the RGB values, not opacity
# Center of image should be blue
self.assertEqual(converted_img.getpixel((45, 45))[0:3], self.blue_rgb)
# Top left corner should be blue background.
self.assertEqual(converted_img.getpixel((0, 0))[0:3], self.blue_rgb)
# Center of rectangle should be red
self.assertEqual(converted_img.getpixel((94, 49))[0:3], self.red_rgb)
# Bottom left edge of rectangle and adjacent background
self.assertEqual(converted_img.getpixel((90, 99))[0:3], self.red_rgb)
self.assertEqual(converted_img.getpixel((89, 99))[0:3], self.blue_rgb)
# Top left edge of rectangle and adjacent background
self.assertEqual(converted_img.getpixel((90, 0))[0:3], self.red_rgb)
self.assertEqual(converted_img.getpixel((89, 0))[0:3], self.blue_rgb)
def get_and_convert_image(image_location, image_convert_settings,
allow_truncated_images=False, disk_cache=False,
request_timeout=60, http_max_retries=2):
"""Wrapper method that retrieves and converts one image.
If run all in-memory (i.e., no disk spill), then returns PIL Image object.
Otherwise returns path of disk-cached image.
Args:
image_location: Image path from the input list of locations.
image_convert_settings: ImageConvertSettings object.
allow_truncated_images: If True, PIL will be tolerant of truncated image
files and load/process them. Note that this isn't
supported on old versions on PIL, just pillow.
disk_cache: Store intermediary image objects to disk. Not supported yet.
request_timeout: Max secs for http requests before timeout.
http_max_retries: Max number of attempts we will try to retrive http images
due to timeout errors.
Returns:
A tuple (Image object or None if fails, status message string). Status
message string will be empty if success, or error message if failure.
Exceptions handled:
All exceptions for image retrieval are handled. Some notable ones are:
- DecompressionBombError: Image is too large (>0.5G). See PIL
documentation for instructions on setting a
higher threshold.
For image conversion, the following errors are handled:
- IOError: error retrieving image file, or truncated image file.
"""
if disk_cache:
raise NotImplementedError()
if allow_truncated_images:
try:
ImageFile.LOAD_TRUNCATED_IMAGES = True
except AttributeError as e:
logging.warning('Are you using PILLOW and not a very old version of PIL? '
'Unable to force load of truncated image files: %s', e)
try:
src_image = atlasmaker_io.get_image(image_location, request_timeout,
http_max_retries=http_max_retries)
except Exception as e:
logging.error('Retrieval of file %s failed with error: %s',
image_location, e)
return None, str(e)
try:
image_converter = convert.ImageConverter(src_image, image_convert_settings)
logging.debug('Successfully converted image: %s' % image_location)
return image_converter.convert(), ''
except IOError as e:
logging.error('Conversion of file %s failed with error: %s',
image_location, e)
return None, str(e)
def testConvertInputSizeSameAsOutput(self):
# Verify that if input and output size are the same, things still work.
orig_img = Image.new('RGBA', (100, 100))
image_converter = convert.ImageConverter(orig_img,
self.conversion_settings)
converted_img = image_converter.convert()
self.assertEqual(converted_img.size,
(self.desired_width, self.desired_height))
def testConvertImagePaddedLargerCorrectSize(self):
# Input image is smaller than desired, but we just pad it to fit new size.
conversion_settings = convert.ImageConvertSettings(
'png',
self.desired_width,
self.desired_height,
resize_if_larger=True)
orig_img = Image.new('RGBA', (10, 10))
image_converter = convert.ImageConverter(orig_img, conversion_settings)
converted_img = image_converter.convert()
self.assertEqual(converted_img.size,
(self.desired_width, self.desired_height))
def testConvertResizedLargerKeepAspectRatio(self):
conversion_settings = convert.ImageConvertSettings(
'png',
self.desired_width,
self.desired_height,
resize_if_larger=True,
preserve_aspect_ratio=False)
orig_img = Image.new('RGBA', (10, 10))
image_converter = convert.ImageConverter(orig_img, conversion_settings)
converted_img = image_converter.convert()
self.assertEqual(converted_img.size,
(self.desired_width, self.desired_height))
def testConvertSmallerIgnoreRatio(self):
# Test resize image to smaller sprite without retaining aspect ratio.
# Simply verifies correct size output.
conversion_settings = convert.ImageConvertSettings(
'png',
self.desired_width,
self.desired_height,
preserve_aspect_ratio=False)
orig_img = Image.new('RGBA', (1000, 500))
image_converter = convert.ImageConverter(orig_img, conversion_settings)
converted_img = image_converter.convert()
self.assertEqual(converted_img.size,
(self.desired_width, self.desired_height))
def testConvertSmallerKeepRatioHasCorrectSize(self):
# Larger image is resized smaller, keeping aspect ratio.
# This test simply verifies the size
# TODO: delete and merge with following tests.
conversion_settings = convert.ImageConvertSettings(
'png',
self.desired_width,
self.desired_height,
preserve_aspect_ratio=True)
orig_img = Image.new('RGBA', (1000, 500))
image_converter = convert.ImageConverter(orig_img, conversion_settings)
converted_img = image_converter.convert()
self.assertEqual(converted_img.size,
(self.desired_width, self.desired_height))
def testConvertSmallerIgnoreRatioCropTopLeftSameAspectRatio(self):
# Verify that we get the desired output image when cropping from left.
# In this case, since the output image's aspect ratio is same as the input
# image's aspect ratio, we're able to crop it correctly and keep the same
# pattern.
# Orig image is a 4 quadrant (200, 200) pixel image, with colors
# (orange, red, green, yellow) starting from top left and going clockwise.
orig_img = Image.new('RGBA', (200, 200), self.yellow_rgb)
orig_img.paste(Image.new('RGBA', (100, 100), self.orange_rgb), (0, 0))
orig_img.paste(Image.new('RGBA', (100, 100), self.red_rgb), (100, 0))
orig_img.paste(Image.new('RGBA', (100, 100), self.green_rgb),
(100, 100))
conversion_settings = convert.ImageConvertSettings(
'png',
self.desired_width,
self.desired_height,
position=(0, 0),
preserve_aspect_ratio=False)
# Output image should be 100x100 cropped from the center.
image_converter = convert.ImageConverter(orig_img, conversion_settings)
converted_img = image_converter.convert()
# Top left of output image should be orange.
self.assertEqual(converted_img.getpixel((0, 0))[0:3], self.orange_rgb)
# Top right should be red
self.assertEqual(converted_img.getpixel((99, 0))[0:3], self.red_rgb)
# Bottom right should be green
self.assertEqual(converted_img.getpixel((99, 99))[0:3], self.green_rgb)
# Bottom left should be yellow
self.assertEqual(converted_img.getpixel((0, 99))[0:3], self.yellow_rgb)
# Center section should comprise the same set of colors clockwise.
self.assertEqual(
converted_img.getpixel((49, 49))[0:3], self.orange_rgb)
self.assertEqual(converted_img.getpixel((50, 49))[0:3], self.red_rgb)
self.assertEqual(converted_img.getpixel((50, 50))[0:3], self.green_rgb)
self.assertEqual(
converted_img.getpixel((49, 50))[0:3], self.yellow_rgb)
def testConvertImageResizedLargerIgnoreRatio(self):
# Verifies that output size and image (based on pixel samples) are correct.
conversion_settings = convert.ImageConvertSettings(
'png',
self.desired_width,
self.desired_height,
bg_color_rgb=self.blue_rgb,
resize_if_larger=True,
preserve_aspect_ratio=False)
orig_img = Image.new('RGBA', (20, 10), self.red_rgb)
image_converter = convert.ImageConverter(orig_img, conversion_settings)
converted_img = image_converter.convert()
# Verify size.
self.assertEqual(converted_img.size,
(self.desired_width, self.desired_height))
# Image should be stretched to fit desired output size, so entire output
# should be red. Verify center, and top left / bottom right edges.
self.assertEqual(converted_img.getpixel((45, 45))[0:3], self.red_rgb)
self.assertEqual(converted_img.getpixel((0, 0))[0:3], self.red_rgb)
self.assertEqual(converted_img.getpixel((99, 99))[0:3], self.red_rgb)
def testConvertResizedSmallDontKeepRatioCenterCrop(self):
# Verify that we get the desired output image when cropping from center.
# Orig image is a 4 quadrant (200, 200) pixel image, with colors
# (orange, red, green, yellow) starting from top left and going clockwise.
orig_img = Image.new('RGBA', (200, 200), self.yellow_rgb)
orig_img.paste(Image.new('RGBA', (100, 100), self.orange_rgb), (0, 0))
orig_img.paste(Image.new('RGBA', (100, 100), self.red_rgb), (100, 0))
orig_img.paste(Image.new('RGBA', (100, 100), self.green_rgb),
(100, 100))
conversion_settings = convert.ImageConvertSettings(
'png',
self.desired_width,
self.desired_height,
preserve_aspect_ratio=False)
# Output image should be 100x100 cropped from the center.
image_converter = convert.ImageConverter(orig_img, conversion_settings)
converted_img = image_converter.convert()
# Top left of output image should be orange.
self.assertEqual(converted_img.getpixel((0, 0))[0:3], self.orange_rgb)
# Top right should be red
self.assertEqual(converted_img.getpixel((99, 0))[0:3], self.red_rgb)
# Bottom right should be green
self.assertEqual(converted_img.getpixel((99, 99))[0:3], self.green_rgb)
# Bottom left should be yellow
self.assertEqual(converted_img.getpixel((0, 99))[0:3], self.yellow_rgb)
# Center section should comprise the same set of colors clockwise.
self.assertEqual(
converted_img.getpixel((49, 49))[0:3], self.orange_rgb)
self.assertEqual(converted_img.getpixel((50, 49))[0:3], self.red_rgb)
self.assertEqual(converted_img.getpixel((50, 50))[0:3], self.green_rgb)
self.assertEqual(
converted_img.getpixel((49, 50))[0:3], self.yellow_rgb)