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Make TIFF strip size configurable

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Miloš Komarčević 2021-10-01 13:50:02 +02:00 committed by GitHub
parent 9025ae8332
commit 63879f04b1
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1 changed files with 3 additions and 2 deletions
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src/PIL/TiffImagePlugin.py
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@ -58,6 +58,7 @@ logger = logging.getLogger(__name__)
READ_LIBTIFF = False READ_LIBTIFF = False
WRITE_LIBTIFF = False WRITE_LIBTIFF = False
IFD_LEGACY_API = True IFD_LEGACY_API = True
STRIP_SIZE = 65536
II = b"II" # little-endian (Intel style) II = b"II" # little-endian (Intel style)
MM = b"MM" # big-endian (Motorola style) MM = b"MM" # big-endian (Motorola style)
@ -1617,9 +1618,9 @@ def _save(im, fp, filename):
ifd[COLORMAP] = tuple(v * 256 for v in lut) ifd[COLORMAP] = tuple(v * 256 for v in lut)
# data orientation # data orientation
stride = len(bits) * ((im.size[0] * bits[0] + 7) // 8) stride = len(bits) * ((im.size[0] * bits[0] + 7) // 8)
# aim for 64 KB strips when using libtiff writer # aim for given strip size (64 KB by default) when using libtiff writer
if libtiff: if libtiff:
rows_per_strip = min((2 ** 16 + stride - 1) // stride, im.size[1]) rows_per_strip = min(STRIP_SIZE // stride, im.size[1])
# JPEG encoder expects multiple of 8 rows # JPEG encoder expects multiple of 8 rows
if compression == "jpeg": if compression == "jpeg":
rows_per_strip = min(((rows_per_strip + 7) // 8) * 8, im.size[1]) rows_per_strip = min(((rows_per_strip + 7) // 8) * 8, im.size[1])