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135 lines
4.6 KiB
135 lines
4.6 KiB
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/* arm_init.c - NEON optimised filter functions |
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* |
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* Copyright (c) 2014,2016 Glenn Randers-Pehrson |
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* Written by Mans Rullgard, 2011. |
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* Last changed in libpng 1.6.22 [May 26, 2016] |
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* |
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* This code is released under the libpng license. |
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* For conditions of distribution and use, see the disclaimer |
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* and license in png.h |
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*/ |
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/* Below, after checking __linux__, various non-C90 POSIX 1003.1 functions are |
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* called. |
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*/ |
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#define _POSIX_SOURCE 1 |
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#include "../pngpriv.h" |
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#ifdef PNG_READ_SUPPORTED |
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#if PNG_ARM_NEON_OPT > 0 |
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#ifdef PNG_ARM_NEON_CHECK_SUPPORTED /* Do run-time checks */ |
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/* WARNING: it is strongly recommended that you do not build libpng with |
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* run-time checks for CPU features if at all possible. In the case of the ARM |
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* NEON instructions there is no processor-specific way of detecting the |
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* presence of the required support, therefore run-time detection is extremely |
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* OS specific. |
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* |
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* You may set the macro PNG_ARM_NEON_FILE to the file name of file containing |
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* a fragment of C source code which defines the png_have_neon function. There |
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* are a number of implementations in contrib/arm-neon, but the only one that |
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* has partial support is contrib/arm-neon/linux.c - a generic Linux |
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* implementation which reads /proc/cpufino. |
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*/ |
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#ifndef PNG_ARM_NEON_FILE |
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# ifdef __linux__ |
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# define PNG_ARM_NEON_FILE "contrib/arm-neon/linux.c" |
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# endif |
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#endif |
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#ifdef PNG_ARM_NEON_FILE |
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#include <signal.h> /* for sig_atomic_t */ |
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static int png_have_neon(png_structp png_ptr); |
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#include PNG_ARM_NEON_FILE |
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#else /* PNG_ARM_NEON_FILE */ |
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# error "PNG_ARM_NEON_FILE undefined: no support for run-time ARM NEON checks" |
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#endif /* PNG_ARM_NEON_FILE */ |
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#endif /* PNG_ARM_NEON_CHECK_SUPPORTED */ |
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#ifndef PNG_ALIGNED_MEMORY_SUPPORTED |
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# error "ALIGNED_MEMORY is required; set: -DPNG_ALIGNED_MEMORY_SUPPORTED" |
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#endif |
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void |
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png_init_filter_functions_neon(png_structp pp, unsigned int bpp) |
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{ |
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/* The switch statement is compiled in for ARM_NEON_API, the call to |
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* png_have_neon is compiled in for ARM_NEON_CHECK. If both are defined |
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* the check is only performed if the API has not set the NEON option on |
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* or off explicitly. In this case the check controls what happens. |
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* |
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* If the CHECK is not compiled in and the option is UNSET the behavior prior |
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* to 1.6.7 was to use the NEON code - this was a bug caused by having the |
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* wrong order of the 'ON' and 'default' cases. UNSET now defaults to OFF, |
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* as documented in png.h |
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*/ |
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png_debug(1, "in png_init_filter_functions_neon"); |
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#ifdef PNG_ARM_NEON_API_SUPPORTED |
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switch ((pp->options >> PNG_ARM_NEON) & 3) |
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{ |
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case PNG_OPTION_UNSET: |
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/* Allow the run-time check to execute if it has been enabled - |
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* thus both API and CHECK can be turned on. If it isn't supported |
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* this case will fall through to the 'default' below, which just |
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* returns. |
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*/ |
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#endif /* PNG_ARM_NEON_API_SUPPORTED */ |
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#ifdef PNG_ARM_NEON_CHECK_SUPPORTED |
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{ |
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static volatile sig_atomic_t no_neon = -1; /* not checked */ |
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if (no_neon < 0) |
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no_neon = !png_have_neon(pp); |
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if (no_neon) |
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return; |
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} |
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#ifdef PNG_ARM_NEON_API_SUPPORTED |
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break; |
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#endif |
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#endif /* PNG_ARM_NEON_CHECK_SUPPORTED */ |
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#ifdef PNG_ARM_NEON_API_SUPPORTED |
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default: /* OFF or INVALID */ |
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return; |
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case PNG_OPTION_ON: |
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/* Option turned on */ |
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break; |
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} |
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#endif |
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/* IMPORTANT: any new external functions used here must be declared using |
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* PNG_INTERNAL_FUNCTION in ../pngpriv.h. This is required so that the |
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* 'prefix' option to configure works: |
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* |
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* ./configure --with-libpng-prefix=foobar_ |
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* |
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* Verify you have got this right by running the above command, doing a build |
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* and examining pngprefix.h; it must contain a #define for every external |
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* function you add. (Notice that this happens automatically for the |
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* initialization function.) |
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*/ |
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pp->read_filter[PNG_FILTER_VALUE_UP-1] = png_read_filter_row_up_neon; |
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if (bpp == 3) |
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{ |
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pp->read_filter[PNG_FILTER_VALUE_SUB-1] = png_read_filter_row_sub3_neon; |
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pp->read_filter[PNG_FILTER_VALUE_AVG-1] = png_read_filter_row_avg3_neon; |
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pp->read_filter[PNG_FILTER_VALUE_PAETH-1] = |
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png_read_filter_row_paeth3_neon; |
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} |
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else if (bpp == 4) |
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{ |
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pp->read_filter[PNG_FILTER_VALUE_SUB-1] = png_read_filter_row_sub4_neon; |
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pp->read_filter[PNG_FILTER_VALUE_AVG-1] = png_read_filter_row_avg4_neon; |
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pp->read_filter[PNG_FILTER_VALUE_PAETH-1] = |
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png_read_filter_row_paeth4_neon; |
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} |
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} |
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#endif /* PNG_ARM_NEON_OPT > 0 */ |
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#endif /* READ */
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