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[libpng15] Updated the documentation of the png_text structure

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(clarifying that the "lang" and "lang_key" fields can be NULL pointers
or might not exist).
This commit is contained in:
Glenn Randers-Pehrson
2011-11-21 17:05:41 -06:00
parent 8e83631361
commit 680da02ade
3 changed files with 51 additions and 30 deletions
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29
libpng-manual.txt
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@@ -1,6 +1,6 @@
libpng-manual.txt - A description on how to use and modify libpng
libpng version 1.5.7beta05 - November 18, 2011
libpng version 1.5.7beta05 - November 21, 2011
Updated and distributed by Glenn Randers-Pehrson
<glennrp at users.sourceforge.net>
Copyright (c) 1998-2011 Glenn Randers-Pehrson
@@ -11,7 +11,7 @@ libpng-manual.txt - A description on how to use and modify libpng
Based on:
libpng versions 0.97, January 1998, through 1.5.7beta05 - November 18, 2011
libpng versions 0.97, January 1998, through 1.5.7beta05 - November 21, 2011
Updated and distributed by Glenn Randers-Pehrson
Copyright (c) 1998-2011 Glenn Randers-Pehrson
@@ -1265,10 +1265,13 @@ pointer into the info_ptr is returned for any complex types.
(empty string for unknown).
Note that the itxt_length, lang, and lang_key
members of the text_ptr structure only exist
when the library is built with iTXt chunk support.
Prior to libpng-1.4.0, the default build was
without iTXt chunk support.
members of the text_ptr structure only exist when the
library is built with iTXt chunk support. Prior to
libpng-1.4.0 the library was built by default without
iTXt support. Also note that when iTXt is supported,
they contain NULL pointers when the "compression"
field contains PNG_TEXT_COMPRESSION_NONE or
PNG_TEXT_COMPRESSION_zTXt.
num_text - number of comments (same as
num_comments; you can put NULL here
@@ -2849,11 +2852,15 @@ width, height, bit_depth, and color_type must be the same in each call.
empty for unknown).
text_ptr[i].translated_keyword - keyword in UTF-8 (NULL
or empty for unknown).
Note that the itxt_length, lang, and lang_key
members of the text_ptr structure only exist
when the library is built with iTXt chunk support.
Prior to libpng-1.4.0 the library was built by default
without iTXt support.
members of the text_ptr structure only exist when the
library is built with iTXt chunk support. Prior to
libpng-1.4.0 the library was built by default without
iTXt support. Also note that when iTXt is supported,
they contain NULL pointers when the "compression"
field contains PNG_TEXT_COMPRESSION_NONE or
PNG_TEXT_COMPRESSION_zTXt.
num_text - number of comments
@@ -4566,7 +4573,7 @@ Other rules can be inferred by inspecting the libpng source.
XIV. Y2K Compliance in libpng
November 18, 2011
November 21, 2011
Since the PNG Development group is an ad-hoc body, we can't make
an official declaration.