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[libpng15] Added run-time detection of ARM/NEON support

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Mans Rullgard 2011-11-16 13:48:18 -06:00 committed by Glenn Randers-Pehrson
parent 76b0459fdd
commit e7acc6ac3d
1 changed files with 47 additions and 5 deletions
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52
pngrutil.c
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@ -3668,22 +3668,64 @@ png_read_filter_row_paeth_multibyte_pixel(png_row_infop row_info, png_bytep row,
} }
#ifdef PNG_ARM_NEON #ifdef PNG_ARM_NEON
#ifdef __linux__
#include <stdio.h>
#include <elf.h>
#include <asm/hwcap.h>
static int png_have_hwcap(unsigned cap)
{
FILE *f = fopen("/proc/self/auxv", "r");
Elf32_auxv_t aux;
int have_cap = 0;
if (!f)
return 0;
while (fread(&aux, sizeof(aux), 1, f) > 0)
{
if (aux.a_type == AT_HWCAP &&
aux.a_un.a_val & cap)
{
have_cap = 1;
break;
}
}
fclose(f);
return have_cap;
}
#endif /* __linux__ */
static void static void
png_init_filter_functions_neon(png_structp pp, unsigned int bpp) png_init_filter_functions_neon(png_structp pp, unsigned int bpp)
{ {
#ifdef __linux__
if (!png_have_hwcap(HWCAP_NEON))
return;
#endif
pp->read_filter[PNG_FILTER_VALUE_UP-1] = png_read_filter_row_up_neon; pp->read_filter[PNG_FILTER_VALUE_UP-1] = png_read_filter_row_up_neon;
if (bpp == 3) { if (bpp == 3)
{
pp->read_filter[PNG_FILTER_VALUE_SUB-1] = png_read_filter_row_sub3_neon; pp->read_filter[PNG_FILTER_VALUE_SUB-1] = png_read_filter_row_sub3_neon;
pp->read_filter[PNG_FILTER_VALUE_AVG-1] = png_read_filter_row_avg3_neon; pp->read_filter[PNG_FILTER_VALUE_AVG-1] = png_read_filter_row_avg3_neon;
pp->read_filter[PNG_FILTER_VALUE_PAETH-1] = png_read_filter_row_paeth3_neon; pp->read_filter[PNG_FILTER_VALUE_PAETH-1] =
} else if (bpp == 4) { png_read_filter_row_paeth3_neon;
}
else if (bpp == 4)
{
pp->read_filter[PNG_FILTER_VALUE_SUB-1] = png_read_filter_row_sub4_neon; pp->read_filter[PNG_FILTER_VALUE_SUB-1] = png_read_filter_row_sub4_neon;
pp->read_filter[PNG_FILTER_VALUE_AVG-1] = png_read_filter_row_avg4_neon; pp->read_filter[PNG_FILTER_VALUE_AVG-1] = png_read_filter_row_avg4_neon;
pp->read_filter[PNG_FILTER_VALUE_PAETH-1] = png_read_filter_row_paeth4_neon; pp->read_filter[PNG_FILTER_VALUE_PAETH-1] =
png_read_filter_row_paeth4_neon;
} }
} }
#endif #endif /* PNG_ARM_NEON */
static void static void
png_init_filter_functions(png_structp pp) png_init_filter_functions(png_structp pp)