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add tests for tiff pyr save region-shrink flag

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we were testing the flag before, but not that the result was correct

see https://github.com/libvips/libvips/issues/1875
This commit is contained in:
John Cupitt 2020-11-03 23:44:11 +00:00
parent 85f3ac6d8f
commit 39899582d4
1 changed files with 9 additions and 12 deletions
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21
test/test-suite/test_foreign.py
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@ -374,10 +374,7 @@ class TestForeign:
self.file_loader("tiffload", TIF4_FILE, tiff4_valid)
if pyvips.at_least_libvips(8, 5):
self.save_load_buffer("tiffsave_buffer",
"tiffload_buffer",
self.colour)
self.save_load_buffer("tiffsave_buffer", "tiffload_buffer", self.colour)
self.save_load("%s.tif", self.mono)
self.save_load("%s.tif", self.colour)
self.save_load("%s.tif", self.cmyk)
@ -510,14 +507,14 @@ class TestForeign:
assert a.height == b.height
assert a.avg() == b.avg()
x = pyvips.Image.new_from_file(TIF_FILE)
buf = x.tiffsave_buffer(tile=True, pyramid=True, region_shrink="mean")
buf = x.tiffsave_buffer(tile=True, pyramid=True, region_shrink="mode")
buf = x.tiffsave_buffer(tile=True, pyramid=True, region_shrink="median")
buf = x.tiffsave_buffer(tile=True, pyramid=True, region_shrink="max")
buf = x.tiffsave_buffer(tile=True, pyramid=True, region_shrink="min")
buf = x.tiffsave_buffer(tile=True, pyramid=True,
region_shrink="nearest")
# just 0/255 in each band, shrink with mode and all pixels should be 0
# or 255 in layer 1
x = pyvips.Image.new_from_file(TIF_FILE) > 128
for shrink in ["mode", "median", "max", "min"]:
buf = x.tiffsave_buffer(pyramid=True, region_shrink=shrink)
y = pyvips.Image.new_from_buffer(buf, "", page=1)
z = y.hist_find(band=0)
assert z(0, 0)[0] + z(255, 0)[0] == y.width * y.height
@skip_if_no("magickload")
def test_magickload(self):