Pillow/Tests/test_imagefile.py

72 lines
1.8 KiB
Python

from tester import *
from PIL import Image
from PIL import ImageFile
codecs = dir(Image.core)
# save original block sizes
MAXBLOCK = ImageFile.MAXBLOCK
SAFEBLOCK = ImageFile.SAFEBLOCK
def test_parser():
def roundtrip(format):
im = lena("L").resize((1000, 1000))
if format in ("MSP", "XBM"):
im = im.convert("1")
file = BytesIO()
im.save(file, format)
data = file.getvalue()
parser = ImageFile.Parser()
parser.feed(data)
imOut = parser.close()
return im, imOut
assert_image_equal(*roundtrip("BMP"))
assert_image_equal(*roundtrip("GIF"))
assert_image_equal(*roundtrip("IM"))
assert_image_equal(*roundtrip("MSP"))
if "zip_encoder" in codecs:
try:
# force multiple blocks in PNG driver
ImageFile.MAXBLOCK = 8192
assert_image_equal(*roundtrip("PNG"))
finally:
ImageFile.MAXBLOCK = MAXBLOCK
assert_image_equal(*roundtrip("PPM"))
assert_image_equal(*roundtrip("TIFF"))
assert_image_equal(*roundtrip("XBM"))
#assert_image_equal(*roundtrip("EPS")) #no eps_decoder
assert_image_equal(*roundtrip("TGA"))
assert_image_equal(*roundtrip("PCX"))
if "jpeg_encoder" in codecs:
im1, im2 = roundtrip("JPEG") # lossy compression
assert_image(im1, im2.mode, im2.size)
# XXX Why assert exception and why does it fail?
# https://github.com/python-imaging/Pillow/issues/78
#assert_exception(IOError, lambda: roundtrip("PDF"))
def test_safeblock():
im1 = lena()
if "zip_encoder" not in codecs:
skip("PNG (zlib) encoder not available")
try:
ImageFile.SAFEBLOCK = 1
im2 = fromstring(tostring(im1, "PNG"))
finally:
ImageFile.SAFEBLOCK = SAFEBLOCK
assert_image_equal(im1, im2)