ANNOUNCE - third_party/libpng - Git at Google


 Libpng 1.0.8beta2 - July 10, 2000

 This is a public release of libpng, intended for use in production codes.

 Changes since the last public release (1.0.6):

   Changed sprintf() to strcpy() in png_write_sCAL_s() to work without STDIO
   Added data_length parameter to png_decompress_chunk() function
   Revised documentation to remove reference to abandoned png_free_chnk functions
   Fixed an error in png_rgb_to_gray_fixed()
   Revised example.c, usage of png_destroy_write_struct().
   Renamed makefile.ibmvac3 to makefile.ibmc, added libpng.icc IBM project file
   Added a check for info_ptr->free_me&PNG_FREE_TEXT when free'ing text in png.c
   Simplify png_sig_bytes() function to remove use of non-ISO-C strdup().
   Added png_data_freer() function.
   In the code that checks for over-length tRNS chunks, added check of
     info_ptr->num_trans as well as png_ptr->num_trans (Matthias Benckmann)
   Check for existing data and free it if the free_me flag is set, in png_set_*()
     and png_handle_*().
   Only define PNG_WEIGHTED_FILTERS_SUPPORTED when PNG_FLOATING_POINT_SUPPORTED
     is defined.
   Changed several instances of PNG_NO_CONSOLE_ID to PNG_NO_STDIO in pngrutil.c
     and mentioned the purposes of the two macros in libpng.txt/libpng.3.
   Revised png_set_iCCP() and png_set_rows() to avoid prematurely freeing data.
   Add checks in png_set_text() for NULL members of the input text structure.
   Removed superfluous prototype for png_set_itxt from png.h
   Removed "else" from pngread.c, after png_error(), and changed "0" to "length".
   Changed several png_errors about malformed ancillary chunks to png_warnings.
   Added png_pass-* arrays to pnggccrd.c when PNG_USE_LOCAL_ARRAYS is defined.
   Relocated paragraph about png_set_background() in libpng.3/libpng.txt
     and other revisions (Matthias Benckmann)
   Relocated info_ptr->free_me to restore binary compatibility with libpng-1.0.5
     (breaks compatibility with libpng-1.0.6).
   Relocated info_ptr->free_me, png_ptr->free_me, and other info_ptr and
     png_ptr members to restore binary compatibility with libpng-1.0.5
     (breaks compatibility with libpng-1.0.6).
   Rearranged some members at the end of png_info and png_struct, to put
     unknown_chunks_num and free_me within the original size of the png_structs
     and free_me, png_read_user_fn, and png_free_fn within the original png_info,
     because some old applications allocate the structs directly instead of
     using png_create_*().
   Added documentation of user memory functions in libpng.txt/libpng.3
   Modified png_read_png so that it will use user_allocated row_pointers
     if present, unless free_me directs that it be freed, and added description
     of the use of png_set_rows() and png_get_rows() in libpng.txt/libpng.3.
   Added PNG_LEGACY_SUPPORTED macro, and #ifdef out all new (since version
     1.00) members of png_struct and png_info, to regain binary compatibility
     when you define this macro.  Capabilities lost in this event
     are user transforms (new in version 1.0.0),the user transform pointer
     (new in version 1.0.2), rgb_to_gray (new in 1.0.5), iCCP, sCAL, sPLT,
     the high-level interface, and unknown chunks support (all new in 1.0.6).
     This was necessary because of old applications that allocate the structs
     directly as authors were instructed to do in libpng-0.88 and earlier,
     instead of using png_create_*().
   Added makefile.intel and updated makefile.watcom (Pawel Mrochen)
   Overloaded png_read_init() and png_write_init() with macros that convert
     calls to png_read_init_2() or png_write_init_2() that check the version
     and structure sizes.
   Made PNG_NO_ITXT_SUPPORTED the default setting, to avoid memory overrun
     when old applications fill the info_ptr->text structure directly.
   Added PNGAPI macro, and added it to the definitions of all exported functions.
   Relocated version macro definitions ahead of the includes of zlib.h and
     pngconf.h in png.h.
   Made PNG_NO_CONSOLE_IO the default condition when PNG_BUILD_DLL is defined.
   Use MSC _RPTn debugging instead of fprintf if _MSC_VER is defined.
   Added png_access_version_number() function.
   Check for mask&PNG_FREE_CHNK (for TEXT, SCAL, PCAL) in png_free_data().
   Expanded libpng.3/libpng.txt information about png_data_freer().
   Changed pnggccrd.c and pngvcrd.c to handle bad adaptive filter types as
     warnings instead of errors, as pngrutil.c does.
   Set the PNG_INFO_IDAT valid flag in png_set_rows() so png_write_png()
     will actually write IDATs.
   Made the default PNG_USE_LOCAL_ARRAYS depend on PNG_DLL instead of WIN32.
   Make png_free_data() ignore its final parameter when freeing data that can
     have multiple instances (text, sPLT, unknowns).
   Removed info_ptr->valid tests from png_free_data(), as in version 1.0.5.
   Added png_set_invalid() function.
   Fixed incorrect illustrations of png_destroy_write_struct() in example.c.
   Revised the deliberately erroneous Linux setjmp code in pngconf.h to produce
     fewer error messages.
   Set each pointer to NULL after freeing it in png_free_data().
   Worked around a problem in pngconf.h; AIX's strings.h defines an "index"
     macro that conflicts with libpng's png_color_16.index. (Dimitri Papadapoulos)
   Added PNG_NO_POINTER_INDEXING macro to use array-indexing instead of pointer
     indexing in pngrutil.c and pngwutil.c to accommodate a buggy compiler.
   Added a check for overlength PLTE chunk in pngrutil.c.
   Added PNG_NO_POINTER_INDEXING macro to use array-indexing instead of pointer
     indexing in pngrutil.c and pngwutil.c to accommodate a buggy compiler.
   Added a warning in png_decompress_chunk() when it runs out of data.
   Revised the copyright/disclaimer/license notice.
   Corrected the definition of PNG_TRANSFORM_INVERT_ALPHA  (0x0400 not 0x0200)
   Added PNG_USE_DLL macro.
   Added "msvc" and contrib/msvctest directories with MSVC++ project files
     (Simon-Pierre Cadieux) and contrib/visupng directory (Willem van Schaik).
   Removed leading underscores from "_PNG_H" and "_PNG_SAVE_BSD_SOURCE" macros.
   Fixed bugs in pngwrite.c and pngwutil.c that prevented writing iCCP chunks.
   Revised the definition of "trans_values" in libpng.3/libpng.txt
   Added png_free(png_ptr, key) two places in pngpread.c to stop memory leaks.
   Changed PNG_NO_STDIO to PNG_NO_CONSOLE_IO, several places in pngrutil.c and
      pngwutil.c.
   Changed PNG_EXPORT_VAR to use PNG_IMPEXP, in pngconf.h.
   Removed unused "#include <assert.h>" from png.c
   Added WindowsCE support.
   Revised pnggccrd.c to work with gcc-2.95.2 and in the Cygwin environment.


 Send comments/corrections/commendations to
 png-implement@ccrc.wustl.edu or to randeg@alum.rpi.edu

 Glenn R-P

	Libpng 1.0.8beta2 - July 10, 2000

	This is a public release of libpng, intended for use in production codes.

	Changes since the last public release (1.0.6):

	Changed sprintf() to strcpy() in png_write_sCAL_s() to work without STDIO
	Added data_length parameter to png_decompress_chunk() function
	Revised documentation to remove reference to abandoned png_free_chnk functions
	Fixed an error in png_rgb_to_gray_fixed()
	Revised example.c, usage of png_destroy_write_struct().
	Renamed makefile.ibmvac3 to makefile.ibmc, added libpng.icc IBM project file
	Added a check for info_ptr->free_me&PNG_FREE_TEXT when free'ing text in png.c
	Simplify png_sig_bytes() function to remove use of non-ISO-C strdup().
	Added png_data_freer() function.
	In the code that checks for over-length tRNS chunks, added check of
	info_ptr->num_trans as well as png_ptr->num_trans (Matthias Benckmann)
	Check for existing data and free it if the free_me flag is set, in png_set_*()
	and png_handle_*().
	Only define PNG_WEIGHTED_FILTERS_SUPPORTED when PNG_FLOATING_POINT_SUPPORTED
	is defined.
	Changed several instances of PNG_NO_CONSOLE_ID to PNG_NO_STDIO in pngrutil.c
	and mentioned the purposes of the two macros in libpng.txt/libpng.3.
	Revised png_set_iCCP() and png_set_rows() to avoid prematurely freeing data.
	Add checks in png_set_text() for NULL members of the input text structure.
	Removed superfluous prototype for png_set_itxt from png.h
	Removed "else" from pngread.c, after png_error(), and changed "0" to "length".
	Changed several png_errors about malformed ancillary chunks to png_warnings.
	Added png_pass-* arrays to pnggccrd.c when PNG_USE_LOCAL_ARRAYS is defined.
	Relocated paragraph about png_set_background() in libpng.3/libpng.txt
	and other revisions (Matthias Benckmann)
	Relocated info_ptr->free_me to restore binary compatibility with libpng-1.0.5
	(breaks compatibility with libpng-1.0.6).
	Relocated info_ptr->free_me, png_ptr->free_me, and other info_ptr and
	png_ptr members to restore binary compatibility with libpng-1.0.5
	(breaks compatibility with libpng-1.0.6).
	Rearranged some members at the end of png_info and png_struct, to put
	unknown_chunks_num and free_me within the original size of the png_structs
	and free_me, png_read_user_fn, and png_free_fn within the original png_info,
	because some old applications allocate the structs directly instead of
	using png_create_*().
	Added documentation of user memory functions in libpng.txt/libpng.3
	Modified png_read_png so that it will use user_allocated row_pointers
	if present, unless free_me directs that it be freed, and added description
	of the use of png_set_rows() and png_get_rows() in libpng.txt/libpng.3.
	Added PNG_LEGACY_SUPPORTED macro, and #ifdef out all new (since version
	1.00) members of png_struct and png_info, to regain binary compatibility
	when you define this macro. Capabilities lost in this event
	are user transforms (new in version 1.0.0),the user transform pointer
	(new in version 1.0.2), rgb_to_gray (new in 1.0.5), iCCP, sCAL, sPLT,
	the high-level interface, and unknown chunks support (all new in 1.0.6).
	This was necessary because of old applications that allocate the structs
	directly as authors were instructed to do in libpng-0.88 and earlier,
	instead of using png_create_*().
	Added makefile.intel and updated makefile.watcom (Pawel Mrochen)
	Overloaded png_read_init() and png_write_init() with macros that convert
	calls to png_read_init_2() or png_write_init_2() that check the version
	and structure sizes.
	Made PNG_NO_ITXT_SUPPORTED the default setting, to avoid memory overrun
	when old applications fill the info_ptr->text structure directly.
	Added PNGAPI macro, and added it to the definitions of all exported functions.
	Relocated version macro definitions ahead of the includes of zlib.h and
	pngconf.h in png.h.
	Made PNG_NO_CONSOLE_IO the default condition when PNG_BUILD_DLL is defined.
	Use MSC _RPTn debugging instead of fprintf if _MSC_VER is defined.
	Added png_access_version_number() function.
	Check for mask&PNG_FREE_CHNK (for TEXT, SCAL, PCAL) in png_free_data().
	Expanded libpng.3/libpng.txt information about png_data_freer().
	Changed pnggccrd.c and pngvcrd.c to handle bad adaptive filter types as
	warnings instead of errors, as pngrutil.c does.
	Set the PNG_INFO_IDAT valid flag in png_set_rows() so png_write_png()
	will actually write IDATs.
	Made the default PNG_USE_LOCAL_ARRAYS depend on PNG_DLL instead of WIN32.
	Make png_free_data() ignore its final parameter when freeing data that can
	have multiple instances (text, sPLT, unknowns).
	Removed info_ptr->valid tests from png_free_data(), as in version 1.0.5.
	Added png_set_invalid() function.
	Fixed incorrect illustrations of png_destroy_write_struct() in example.c.
	Revised the deliberately erroneous Linux setjmp code in pngconf.h to produce
	fewer error messages.
	Set each pointer to NULL after freeing it in png_free_data().
	Worked around a problem in pngconf.h; AIX's strings.h defines an "index"
	macro that conflicts with libpng's png_color_16.index. (Dimitri Papadapoulos)
	Added PNG_NO_POINTER_INDEXING macro to use array-indexing instead of pointer
	indexing in pngrutil.c and pngwutil.c to accommodate a buggy compiler.
	Added a check for overlength PLTE chunk in pngrutil.c.
	Added PNG_NO_POINTER_INDEXING macro to use array-indexing instead of pointer
	indexing in pngrutil.c and pngwutil.c to accommodate a buggy compiler.
	Added a warning in png_decompress_chunk() when it runs out of data.
	Revised the copyright/disclaimer/license notice.
	Corrected the definition of PNG_TRANSFORM_INVERT_ALPHA (0x0400 not 0x0200)
	Added PNG_USE_DLL macro.
	Added "msvc" and contrib/msvctest directories with MSVC++ project files
	(Simon-Pierre Cadieux) and contrib/visupng directory (Willem van Schaik).
	Removed leading underscores from "_PNG_H" and "_PNG_SAVE_BSD_SOURCE" macros.
	Fixed bugs in pngwrite.c and pngwutil.c that prevented writing iCCP chunks.
	Revised the definition of "trans_values" in libpng.3/libpng.txt
	Added png_free(png_ptr, key) two places in pngpread.c to stop memory leaks.
	Changed PNG_NO_STDIO to PNG_NO_CONSOLE_IO, several places in pngrutil.c and
	pngwutil.c.
	Changed PNG_EXPORT_VAR to use PNG_IMPEXP, in pngconf.h.
	Removed unused "#include <assert.h>" from png.c
	Added WindowsCE support.
	Revised pnggccrd.c to work with gcc-2.95.2 and in the Cygwin environment.


	Send comments/corrections/commendations to
	png-implement@ccrc.wustl.edu or to randeg@alum.rpi.edu

	Glenn R-P