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fixing dds plugin on Py 2.x, relaxing dxt5 test

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This commit is contained in:
wiredfool 2016-01-08 13:58:19 -08:00
parent 13f2d22700
commit 18d48dc665
2 changed files with 20 additions and 9 deletions
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4
PIL/DdsImagePlugin.py
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@ -145,7 +145,7 @@ def _dxt1(data, width, height):
r, g, b = 0, 0, 0
idx = 4 * ((y + j) * width + (x + i))
ret[idx:idx+4] = bytes([r, g, b, 0xff])
ret[idx:idx+4] = struct.pack('4B', r, g, b, 255)
return bytes(ret)
@ -202,7 +202,7 @@ def _dxt5(data, width, height):
r, g, b = _c3(r0, r1), _c3(g0, g1), _c3(b0, b1)
idx = 4 * ((y + j) * width + (x + i))
ret[idx:idx+4] = bytes([r, g, b, alpha])
ret[idx:idx+4] = struct.pack('4B', r, g, b, alpha)
return bytes(ret)

19
Tests/test_file_dds.py
View File

@ -12,26 +12,37 @@ class TestFileDds(PillowTestCase):
def test_sanity_dxt1(self):
"""Check DXT1 images can be opened"""
target = Image.open(TEST_FILE_DXT1.replace('.dds', '.png'))
im = Image.open(TEST_FILE_DXT1)
im.load()
self.assertEqual(im.format, "DDS")
self.assertEqual(im.mode, "RGBA")
self.assertEqual(im.size, (256, 256))
target = Image.open(TEST_FILE_DXT1.replace('.dds', '.png'))
target.show()
# This target image is from the test set of images, and is exact.
self.assert_image_equal(target.convert('RGBA'), im)
def test_sanity_dxt5(self):
"""Check DXT5 images can be opened"""
target = Image.open(TEST_FILE_DXT5.replace('.dds', '.png'))
im = Image.open(TEST_FILE_DXT5)
im.load()
self.assertEqual(im.format, "DDS")
self.assertEqual(im.mode, "RGBA")
self.assertEqual(im.size, (256, 256))
target = Image.open(TEST_FILE_DXT5.replace('.dds', '.png'))
self.assert_image_equal(target, im)
# Imagemagick, which generated this target image from the .dds
# has a slightly different decoder than is standard. It looks
# a little brighter. The 0,0 pixel is (00,6c,f8,ff) by our code,
# and by the target image for the DXT1, and the imagemagick .png
# is giving (00, 6d, ff, ff). So, assert similar, pretty tight
# I'm currently seeing about a 3 for the epsilon.
self.assert_image_similar(target, im, 5)
def test_sanity_dxt3(self):