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/* loongarch_lsx_init.c - LSX optimized filter functions
*
* Copyright (c) 2021 Loongson Technology Corporation Limited
* All rights reserved.
* Contributed by Jin Bo <jinbo@loongson.cn>
*
* 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"
#ifdef PNG_READ_SUPPORTED
#if PNG_LOONGARCH_LSX_IMPLEMENTATION == 1
#include <sys/auxv.h>
#define LA_HWCAP_LSX (1<<4)
static int png_has_lsx(void)
{
int flags = 0;
int flag = (int)getauxval(AT_HWCAP);
if (flag & LA_HWCAP_LSX)
return 1;
return 0;
}
void
png_init_filter_functions_lsx(png_structp pp, unsigned int bpp)
{
/* 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.)
*/
if (png_has_lsx())
{
pp->read_filter[PNG_FILTER_VALUE_UP-1] = png_read_filter_row_up_lsx;
if (bpp == 3)
{
pp->read_filter[PNG_FILTER_VALUE_SUB-1] = png_read_filter_row_sub3_lsx;
pp->read_filter[PNG_FILTER_VALUE_AVG-1] = png_read_filter_row_avg3_lsx;
pp->read_filter[PNG_FILTER_VALUE_PAETH-1] = png_read_filter_row_paeth3_lsx;
}
else if (bpp == 4)
{
pp->read_filter[PNG_FILTER_VALUE_SUB-1] = png_read_filter_row_sub4_lsx;
pp->read_filter[PNG_FILTER_VALUE_AVG-1] = png_read_filter_row_avg4_lsx;
pp->read_filter[PNG_FILTER_VALUE_PAETH-1] = png_read_filter_row_paeth4_lsx;
}
}
}
#endif /* PNG_LOONGARCH_LSX_IMPLEMENTATION == 1 */
#endif /* PNG_READ_SUPPORTED */