87 lines
2.3 KiB
C
87 lines
2.3 KiB
C
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/* arm_init.c - NEON optimised filter functions
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*
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* Copyright (c) 2013 Glenn Randers-Pehrson
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* Written by Mans Rullgard, 2011.
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* Last changed in libpng 1.5.14 [(PENDING RELEASE)]
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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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#include "../pngpriv.h"
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/* __arm__ is defined by GCC, MSVC defines _M_ARM to the ARM version number */
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#if defined __linux__ && defined __arm__
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#include <stdio.h>
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#include <elf.h>
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#include <asm/hwcap.h>
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static int png_have_hwcap(unsigned cap)
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{
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FILE *f = fopen("/proc/self/auxv", "r");
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Elf32_auxv_t aux;
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int have_cap = 0;
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if (!f)
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return 0;
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while (fread(&aux, sizeof(aux), 1, f) > 0)
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{
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if (aux.a_type == AT_HWCAP &&
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aux.a_un.a_val & cap)
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{
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have_cap = 1;
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break;
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}
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}
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fclose(f);
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return have_cap;
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}
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#endif /* __linux__ && __arm__ */
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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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#ifdef __arm__
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#ifdef __linux__
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if (!png_have_hwcap(HWCAP_NEON))
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return;
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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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#else
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PNG_UNUSED(pp)
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PNG_UNUSED(bpp)
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#endif
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}
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