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