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[libpng16] Removed PNG_FILTER_OPTIMIZATIONS and PNG_ARM_NEON_SUPPORTED from

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pnglibconf.h, allowing more of the decisions to be made internally
(pngpriv.h) during the compile.  Without this, symbol prefixing is broken
under certain circumstances on ARM platforms.  Now only the API parts of
the optimizations ('check' vs 'api') are exposed in the public header files
except that the new setting PNG_ARM_NEON_OPT documents how libpng makes the
decision about whether or not to use the optimizations.
This commit is contained in:
John Bowler
2013-06-08 13:07:13 -05:00
committed by Glenn Randers-Pehrson
parent 0486b17fbd
commit 18dd07e3e6
9 changed files with 89 additions and 57 deletions
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32
pngpriv.h
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@@ -88,6 +88,38 @@
# endif
#endif
/* Compile time options.
* =====================
* In a multi-arch build the compiler may compile the code several times for the
* same object module, producing different binaries for different architectures.
* When this happens configure-time setting of the target host options cannot be
* done and this interferes with the handling of the ARM NEON optimizations, and
* possibly other similiar optimizations. Put additional tests here; in general
* this is needed when the same option can be changed at both compile time and
* run time depending on the target OS (i.e. iOS vs Android.) The changes have
* to occur here to get the symbol prefixing to work consistently.
*/
#ifndef PNG_ARM_NEON_OPT
/* ARM NEON optimizations are being controlled by the compiler settings,
* typically the target FPU. If the FPU has been set to NEON (-mfpu=neon
* with GCC) then the compiler will define __ARM_NEON__ and we can rely
* unconditionally on NEON instructions not crashing, otherwise we must
* disable use of NEON instructions:
*/
# ifdef __ARM_NEON__
# define PNG_ARM_NEON_OPT 2
# else
# define PNG_ARM_NEON_OPT 0
# endif
#endif
#if PNG_ARM_NEON_OPT > 0
/* NEON optimizations are to be at least considered by libpng, enable the
* callbacks to do this. (This is what matters for the symbol prefixing.)
*/
# define PNG_FILTER_OPTIMIZATIONS png_init_filter_functions_neon
#endif
/* Is this a build of a DLL where compilation of the object modules requires
* different preprocessor settings to those required for a simple library? If
* so PNG_BUILD_DLL must be set.