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Merge pull request #4034 from cgohlke/patch-1

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Initialize rows_per_strip when RowsPerStrip tag is missing
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Andrew Murray 2019-09-30 22:32:34 +10:00 committed by GitHub
commit fb8470187a
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3 changed files with 12 additions and 1 deletions
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Tests/images/no_rows_per_strip.tif Normal file
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7
Tests/test_file_libtiff.py
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@ -832,6 +832,13 @@ class TestFileLibTiff(LibTiffTestCase):
im, "Tests/images/old-style-jpeg-compression.png"
)
def test_no_rows_per_strip(self):
# This image does not have a RowsPerStrip TIFF tag
infile = "Tests/images/no_rows_per_strip.tif"
im = Image.open(infile)
im.load()
self.assertEqual(im.size, (950, 975))
def test_orientation(self):
base_im = Image.open("Tests/images/g4_orientation_1.tif")

6
src/libImaging/TiffDecode.c
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@ -405,8 +405,12 @@ int ImagingLibTiffDecode(Imaging im, ImagingCodecState state, UINT8* buffer, Py_
UINT32 strip_row, row_byte_size;
UINT8 *new_data;
UINT32 rows_per_strip;
int ret;
TIFFGetField(tiff, TIFFTAG_ROWSPERSTRIP, &rows_per_strip);
ret = TIFFGetField(tiff, TIFFTAG_ROWSPERSTRIP, &rows_per_strip);
if (ret != 1) {
rows_per_strip = state->ysize;
}
TRACE(("RowsPerStrip: %u \n", rows_per_strip));
// We could use TIFFStripSize, but for YCbCr data it returns subsampled data size