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[master] Revised iTXt support and documentation

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This commit is contained in:
Glenn Randers-Pehrson 2009-11-01 08:47:04 -06:00
parent dc38e24fed
commit 3de7bde0e1
5 changed files with 18 additions and 16 deletions
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4
ANNOUNCE
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@ -100,6 +100,10 @@ version 1.2.41beta10 [November 1, 2009]
been building previous versions with PNG_iTXt_SUPPORTED as well.
version 1.2.41beta11 [November 1, 2009]
Revised iTXt support. To ensure binary compatibility with
previous versions, the "lang" and "lang_key" members will be assumed
to be omitted from previous versions whenever there is a library
mismatch.
Send comments/corrections/commendations to png-mng-implement at lists.sf.net

4
CHANGES
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@ -2530,6 +2530,10 @@ version 1.2.41beta10 [November 1, 2009]
been building previous versions with PNG_iTXt_SUPPORTED as well.
version 1.2.41beta11 [November 1, 2009]
Revised iTXt support. To ensure binary compatibility with
previous versions, the "lang" and "lang_key" members will be assumed
to be omitted from previous versions whenever there is a library
mismatch.
Send comments/corrections/commendations to png-mng-implement at lists.sf.net
(subscription required; visit

6
libpng-1.2.41beta11.txt
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@ -2951,11 +2951,7 @@ png_create_write_struct_2(), png_set_mem_fn(), png_get_mem_ptr(),
png_malloc_default(), and png_free_default() were added.
Support for the iTXt chunk has been enabled by default as of
version 1.2.41. If you have been defining PNG_iTXt_SUPPORTED
already, please continue to do so, as a signal to libpng that your
previous versions also supported iTXt. If you have not been defining
PNG_iTXt_SUPPORTED, please don't start now; it will be enabled for
you by default.
version 1.2.41.
Support for certain MNG features was enabled.

6
libpng.3
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@ -3772,11 +3772,7 @@ png_create_write_struct_2(), png_set_mem_fn(), png_get_mem_ptr(),
png_malloc_default(), and png_free_default() were added.
Support for the iTXt chunk has been enabled by default as of
version 1.2.41. If you have been defining PNG_iTXt_SUPPORTED
already, please continue to do so, as a signal to libpng that your
previous versions also supported iTXt. If you have not been defining
PNG_iTXt_SUPPORTED, please don't start now; it will be enabled for
you by default.
version 1.2.41.
Support for certain MNG features was enabled.

14
pngset.c
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@ -662,18 +662,20 @@ png_set_text_2(png_structp png_ptr, png_infop info_ptr, png_textp text_ptr,
if (png_ptr == NULL || info_ptr == NULL || num_text == 0)
return(0);
#ifdef PNG_iTXt_NOT_PREVIOUSLY_SUPPORTED
/* If an earlier version of the library was used to build the
* application, it might be using a png_textp structure that
* does not contain the lang or lang_key elements. If you build
* does not contain the lang or lang_key elements. Even if you build
* this library with PNG_iTXt_SUPPORTED explicitly defined,
* then we assume that your older library was also built with
* PNG_iTXt_SUPPORTED defined and the complete png_textp structure
* has existed all along and it's safe to access them. See pngconf.h.
* and your older library was also built with PNG_iTXt_SUPPORTED
* defined, the complete png_textp structure probably has not existed
* all along and it's not safe to access them, due to a bug in
* pngconf.h from version 1.2.9 to 1.2.40.
*
* To do: accept mismatched libraries when both are version 1.2.41
* or later.
*/
if (png_ptr->flags & PNG_FLAG_LIBRARY_MISMATCH)
caller_no_itxt = 1;
#endif
/* Make sure we have enough space in the "text" array in info_struct
* to hold all of the incoming text_ptr objects.