mirror of
https://git.code.sf.net/p/libpng/code.git
synced 2025-07-10 18:04:09 +02:00
d59c19b64c
png_malloc_default png_free_default. Updated some left over "1.6.0beta32" in code sources. Fixed a "png_structp" prototype (should be png_structrp) in arm_init.c Updated the version-number hack in pngvalid.c
87 lines
2.3 KiB
C
87 lines
2.3 KiB
C
|
|
/* arm_init.c - NEON optimised filter functions
|
|
*
|
|
* Copyright (c) 2012 Glenn Randers-Pehrson
|
|
* Written by Mans Rullgard, 2011.
|
|
* Last changed in libpng 1.6.0 [(PENDING RELEASE)]
|
|
*
|
|
* This code is released under the libpng license.
|
|
* For conditions of distribution and use, see the disclaimer
|
|
* and license in png.h
|
|
*/
|
|
#include "../pngpriv.h"
|
|
|
|
/* __arm__ is defined by GCC, MSVC defines _M_ARM to the ARM version number */
|
|
#if defined __linux__ && defined __arm__
|
|
#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__ && __arm__ */
|
|
|
|
void
|
|
png_init_filter_functions_neon(png_structrp pp, unsigned int bpp)
|
|
{
|
|
#ifdef __arm__
|
|
#ifdef __linux__
|
|
if (!png_have_hwcap(HWCAP_NEON))
|
|
return;
|
|
#endif
|
|
|
|
/* IMPORTANT: any new external functions used here must be declared using
|
|
* PNG_INTERNAL_FUNCTION in ../pngpriv.h. This is required so that the
|
|
* 'prefix' option to configure works:
|
|
*
|
|
* ./configure --with-libpng-prefix=foobar_
|
|
*
|
|
* Verify you have got this right by running the above command, doing a build
|
|
* and examining pngprefix.h; it must contain a #define for every external
|
|
* function you add. (Notice that this happens automatically for the
|
|
* initialization function.)
|
|
*/
|
|
pp->read_filter[PNG_FILTER_VALUE_UP-1] = png_read_filter_row_up_neon;
|
|
|
|
if (bpp == 3)
|
|
{
|
|
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_PAETH-1] =
|
|
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_AVG-1] = png_read_filter_row_avg4_neon;
|
|
pp->read_filter[PNG_FILTER_VALUE_PAETH-1] =
|
|
png_read_filter_row_paeth4_neon;
|
|
}
|
|
#else
|
|
PNG_UNUSED(pp)
|
|
PNG_UNUSED(bpp)
|
|
#endif
|
|
}
|