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[libpng18] chore: Clean up remnants of the long-discontinued Win16 support

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Remove #ifdef sections and other workarounds for old Windows compilers
that lacked proper support for Win32, including, especially, support
for the Win32 stdio API.

This is a cherry-pick of commit e936211760ddf0ed4a4711ea897b59395dfd206e
from branch 'libpng18'.

Reviewed-by: John Bowler <jbowler@acm.org>
Signed-off-by: Cosmin Truta <ctruta@gmail.com>
This commit is contained in:
Cosmin Truta
2025-02-21 11:31:13 +02:00
parent 738f5e743c
commit 044536de92
6 changed files with 25 additions and 36 deletions
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33
pngconf.h
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@@ -222,22 +222,10 @@
# error "PNG_USER_PRIVATEBUILD must be defined if PNGAPI is changed"
# endif
# if (defined(_MSC_VER) && _MSC_VER < 800) ||\
(defined(__BORLANDC__) && __BORLANDC__ < 0x500)
/* older Borland and MSC
* compilers used '__export' and required this to be after
* the type.
*/
# ifndef PNG_EXPORT_TYPE
# define PNG_EXPORT_TYPE(type) type PNG_IMPEXP
# endif
# define PNG_DLL_EXPORT __export
# else /* newer compiler */
# define PNG_DLL_EXPORT __declspec(dllexport)
# ifndef PNG_DLL_IMPORT
# define PNG_DLL_IMPORT __declspec(dllimport)
# endif
# endif /* compiler */
# define PNG_DLL_EXPORT __declspec(dllexport)
# ifndef PNG_DLL_IMPORT
# define PNG_DLL_IMPORT __declspec(dllimport)
# endif
#else /* !Windows */
# if (defined(__IBMC__) || defined(__IBMCPP__)) && defined(__OS2__)
@@ -592,10 +580,6 @@ typedef const png_fixed_point * png_const_fixed_point_p;
typedef size_t * png_size_tp;
typedef const size_t * png_const_size_tp;
#ifdef PNG_STDIO_SUPPORTED
typedef FILE * png_FILE_p;
#endif
#ifdef PNG_FLOATING_POINT_SUPPORTED
typedef double * png_doublep;
typedef const double * png_const_doublep;
@@ -617,6 +601,15 @@ typedef double * * png_doublepp;
/* Pointers to pointers to pointers; i.e., pointer to array */
typedef char * * * png_charppp;
#ifdef PNG_STDIO_SUPPORTED
/* With PNG_STDIO_SUPPORTED it was possible to use I/O streams that were
* not necessarily stdio FILE streams, to allow building Windows applications
* before Win32 and Windows CE applications before WinCE 3.0, but that kind
* of support has long been discontinued.
*/
typedef FILE * png_FILE_p; /* [Deprecated] */
#endif
#endif /* PNG_BUILDING_SYMBOL_TABLE */
#endif /* PNGCONF_H */