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| 2 | /* mips_init.c - MSA optimised filter functions
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| 3 | *
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| 4 | * Copyright (c) 2018 Cosmin Truta
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| 5 | * Copyright (c) 2016 Glenn Randers-Pehrson
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| 6 | * Written by Mandar Sahastrabuddhe, 2016.
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| 7 | *
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| 8 | * This code is released under the libpng license.
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| 9 | * For conditions of distribution and use, see the disclaimer
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| 10 | * and license in png.h
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| 11 | */
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| 12 |
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| 13 | /* Below, after checking __linux__, various non-C90 POSIX 1003.1 functions are
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| 14 | * called.
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| 15 | */
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| 16 | #define _POSIX_SOURCE 1
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| 17 |
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| 18 | #include <stdio.h>
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| 19 | #include "../pngpriv.h"
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| 20 |
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| 21 | #ifdef PNG_READ_SUPPORTED
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| 22 |
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| 23 | #if PNG_MIPS_MSA_OPT > 0
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| 24 | #ifdef PNG_MIPS_MSA_CHECK_SUPPORTED /* Do run-time checks */
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| 25 | /* WARNING: it is strongly recommended that you do not build libpng with
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| 26 | * run-time checks for CPU features if at all possible. In the case of the MIPS
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| 27 | * MSA instructions there is no processor-specific way of detecting the
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| 28 | * presence of the required support, therefore run-time detection is extremely
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| 29 | * OS specific.
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| 30 | *
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| 31 | * You may set the macro PNG_MIPS_MSA_FILE to the file name of file containing
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| 32 | * a fragment of C source code which defines the png_have_msa function. There
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| 33 | * are a number of implementations in contrib/mips-msa, but the only one that
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| 34 | * has partial support is contrib/mips-msa/linux.c - a generic Linux
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| 35 | * implementation which reads /proc/cpufino.
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| 36 | */
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| 37 | #ifndef PNG_MIPS_MSA_FILE
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| 38 | # ifdef __linux__
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| 39 | # define PNG_MIPS_MSA_FILE "contrib/mips-msa/linux.c"
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| 40 | # endif
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| 41 | #endif
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| 42 |
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| 43 | #ifdef PNG_MIPS_MSA_FILE
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| 44 |
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| 45 | #include <signal.h> /* for sig_atomic_t */
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| 46 | static int png_have_msa(png_structp png_ptr);
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| 47 | #include PNG_MIPS_MSA_FILE
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| 48 |
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| 49 | #else /* PNG_MIPS_MSA_FILE */
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| 50 | # error "PNG_MIPS_MSA_FILE undefined: no support for run-time MIPS MSA checks"
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| 51 | #endif /* PNG_MIPS_MSA_FILE */
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| 52 | #endif /* PNG_MIPS_MSA_CHECK_SUPPORTED */
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| 53 |
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| 54 | #ifndef PNG_ALIGNED_MEMORY_SUPPORTED
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| 55 | # error "ALIGNED_MEMORY is required; set: -DPNG_ALIGNED_MEMORY_SUPPORTED"
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| 56 | #endif
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| 57 |
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| 58 | void
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| 59 | png_init_filter_functions_msa(png_structp pp, unsigned int bpp)
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| 60 | {
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| 61 | /* The switch statement is compiled in for MIPS_MSA_API, the call to
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| 62 | * png_have_msa is compiled in for MIPS_MSA_CHECK. If both are defined
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| 63 | * the check is only performed if the API has not set the MSA option on
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| 64 | * or off explicitly. In this case the check controls what happens.
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| 65 | */
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| 66 |
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| 67 | #ifdef PNG_MIPS_MSA_API_SUPPORTED
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| 68 | switch ((pp->options >> PNG_MIPS_MSA) & 3)
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| 69 | {
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| 70 | case PNG_OPTION_UNSET:
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| 71 | /* Allow the run-time check to execute if it has been enabled -
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| 72 | * thus both API and CHECK can be turned on. If it isn't supported
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| 73 | * this case will fall through to the 'default' below, which just
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| 74 | * returns.
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| 75 | */
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| 76 | #endif /* PNG_MIPS_MSA_API_SUPPORTED */
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| 77 | #ifdef PNG_MIPS_MSA_CHECK_SUPPORTED
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| 78 | {
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| 79 | static volatile sig_atomic_t no_msa = -1; /* not checked */
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| 80 |
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| 81 | if (no_msa < 0)
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| 82 | no_msa = !png_have_msa(pp);
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| 83 |
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| 84 | if (no_msa)
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| 85 | return;
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| 86 | }
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| 87 | #ifdef PNG_MIPS_MSA_API_SUPPORTED
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| 88 | break;
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| 89 | #endif
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| 90 | #endif /* PNG_MIPS_MSA_CHECK_SUPPORTED */
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| 91 |
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| 92 | #ifdef PNG_MIPS_MSA_API_SUPPORTED
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| 93 | default: /* OFF or INVALID */
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| 94 | return;
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| 95 |
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| 96 | case PNG_OPTION_ON:
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| 97 | /* Option turned on */
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| 98 | break;
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| 99 | }
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| 100 | #endif
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| 101 |
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| 102 | /* IMPORTANT: any new external functions used here must be declared using
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| 103 | * PNG_INTERNAL_FUNCTION in ../pngpriv.h. This is required so that the
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| 104 | * 'prefix' option to configure works:
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| 105 | *
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| 106 | * ./configure --with-libpng-prefix=foobar_
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| 107 | *
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| 108 | * Verify you have got this right by running the above command, doing a build
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| 109 | * and examining pngprefix.h; it must contain a #define for every external
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| 110 | * function you add. (Notice that this happens automatically for the
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| 111 | * initialization function.)
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| 112 | */
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| 113 | pp->read_filter[PNG_FILTER_VALUE_UP-1] = png_read_filter_row_up_msa;
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| 114 |
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| 115 | if (bpp == 3)
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| 116 | {
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| 117 | pp->read_filter[PNG_FILTER_VALUE_SUB-1] = png_read_filter_row_sub3_msa;
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| 118 | pp->read_filter[PNG_FILTER_VALUE_AVG-1] = png_read_filter_row_avg3_msa;
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| 119 | pp->read_filter[PNG_FILTER_VALUE_PAETH-1] = png_read_filter_row_paeth3_msa;
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| 120 | }
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| 121 |
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| 122 | else if (bpp == 4)
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| 123 | {
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| 124 | pp->read_filter[PNG_FILTER_VALUE_SUB-1] = png_read_filter_row_sub4_msa;
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| 125 | pp->read_filter[PNG_FILTER_VALUE_AVG-1] = png_read_filter_row_avg4_msa;
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| 126 | pp->read_filter[PNG_FILTER_VALUE_PAETH-1] = png_read_filter_row_paeth4_msa;
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| 127 | }
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| 128 | }
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| 129 | #endif /* PNG_MIPS_MSA_OPT > 0 */
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| 130 | #endif /* READ */
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