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wiredfool 2016-12-14 04:28:27 -08:00
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docs/reference/tiff_metadata.rst
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@ -54,22 +54,23 @@ them) of built in items that regular. These have one of three call
signatures: signatures:
* Individual: ``TIFFVSetField(tiff, tag, item)`` * Individual: ``TIFFVSetField(tiff, tag, item)``
* Multiple, passcount=1: ``TIFFVSetField(tiff, tag, ct, items* )``
* Multiple, passcount=0: ``TIFFVSetField(tiff, tag, items* )`` * Multiple, passcount=0: ``TIFFVSetField(tiff, tag, items* )``
* Multiple, passcount=1: ``TIFFVSetField(tiff, tag, ct, items* )``
In libtiff4, the individual integer like numeric items are passed as In libtiff4, the individual integer like numeric items are passed as
32 bit ints (signed or unsigned as appropriate) even if the actual 32 bit ints (signed or unsigned as appropriate) even if the actual
item is a short or char. The individual rational and floating point item is a short or char. The individual rational and floating point
types are all passed as a double. types are all passed as a double.
The multipile value items are passed as pointers to packed arrays of The multiple value items are passed as pointers to packed arrays of
the correct type, short for short. the correct type, short for short.
UNDONE -- This isn't quite true: The count is only used for items UNDONE -- This isn't quite true: The count is only used for items
where field_passcount is true. Then if ``field->writecount`` == where field_passcount is true. Then if ``field->writecount`` ==
``TIFF_VARIABLE2``, then it's a ``uint32``, otherwise count is an int. ``TIFF_VARIABLE2``, then it's a ``uint32``, otherwise count is an int.
Otherwise, if ``field_writecount`` is ``TIFF_VARIABLE`` or Otherwise, if ``field_writecount`` is ``TIFF_VARIABLE`` or
``TIFF_VARIABLE2``, then the count is not used and set to 1. If it's ``TIFF_VARIABLE2``, then the count is not passed and 1 item is read. If it's
``TIFF_SPP``, then it's set to samplesperpixel. Otherwise, it's set to ``TIFF_SPP``, then it's set to samplesperpixel. Otherwise, it's set to
the ``field_writecount``. the ``field_writecount``.