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wiredfool 2016-12-14 04:28:27 -08:00
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commit c69500e026
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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:
* Individual: ``TIFFVSetField(tiff, tag, item)``
* Multiple, passcount=1: ``TIFFVSetField(tiff, tag, ct, 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
32 bit ints (signed or unsigned as appropriate) even if the actual
item is a short or char. The individual rational and floating point
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.
UNDONE -- This isn't quite true: The count is only used for items
where field_passcount is true. Then if ``field->writecount`` ==
``TIFF_VARIABLE2``, then it's a ``uint32``, otherwise count is an int.
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
the ``field_writecount``.