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| 2 | /* powerpc_init.c - POWERPC 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) 2017 Glenn Randers-Pehrson
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| 6 | * Written by Vadim Barkov, 2017.
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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_POWERPC_VSX_OPT > 0
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| 24 | #ifdef PNG_POWERPC_VSX_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 PowerPC
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| 27 | * VSX 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_POWERPC_VSX_FILE to the file name of file containing
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| 32 | * a fragment of C source code which defines the png_have_vsx function. There
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| 33 | * are a number of implementations in contrib/powerpc-vsx, but the only one that
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| 34 | * has partial support is contrib/powerpc-vsx/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_POWERPC_VSX_FILE
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| 38 | # ifdef __linux__
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| 39 | # define PNG_POWERPC_VSX_FILE "contrib/powerpc-vsx/linux_aux.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_POWERPC_VSX_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_vsx(png_structp png_ptr);
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| 47 | #include PNG_POWERPC_VSX_FILE
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| 48 |
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| 49 | #else /* PNG_POWERPC_VSX_FILE */
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| 50 | # error "PNG_POWERPC_VSX_FILE undefined: no support for run-time POWERPC VSX checks"
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| 51 | #endif /* PNG_POWERPC_VSX_FILE */
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| 52 | #endif /* PNG_POWERPC_VSX_CHECK_SUPPORTED */
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| 53 |
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| 54 | void
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| 55 | png_init_filter_functions_vsx(png_structp pp, unsigned int bpp)
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| 56 | {
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| 57 | /* The switch statement is compiled in for POWERPC_VSX_API, the call to
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| 58 | * png_have_vsx is compiled in for POWERPC_VSX_CHECK. If both are defined
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| 59 | * the check is only performed if the API has not set the PowerPC option on
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| 60 | * or off explicitly. In this case the check controls what happens.
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| 61 | */
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| 62 |
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| 63 | #ifdef PNG_POWERPC_VSX_API_SUPPORTED
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| 64 | switch ((pp->options >> PNG_POWERPC_VSX) & 3)
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| 65 | {
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| 66 | case PNG_OPTION_UNSET:
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| 67 | /* Allow the run-time check to execute if it has been enabled -
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| 68 | * thus both API and CHECK can be turned on. If it isn't supported
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| 69 | * this case will fall through to the 'default' below, which just
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| 70 | * returns.
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| 71 | */
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| 72 | #endif /* PNG_POWERPC_VSX_API_SUPPORTED */
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| 73 | #ifdef PNG_POWERPC_VSX_CHECK_SUPPORTED
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| 74 | {
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| 75 | static volatile sig_atomic_t no_vsx = -1; /* not checked */
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| 76 |
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| 77 | if (no_vsx < 0)
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| 78 | no_vsx = !png_have_vsx(pp);
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| 79 |
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| 80 | if (no_vsx)
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| 81 | return;
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| 82 | }
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| 83 | #ifdef PNG_POWERPC_VSX_API_SUPPORTED
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| 84 | break;
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| 85 | #endif
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| 86 | #endif /* PNG_POWERPC_VSX_CHECK_SUPPORTED */
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| 87 |
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| 88 | #ifdef PNG_POWERPC_VSX_API_SUPPORTED
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| 89 | default: /* OFF or INVALID */
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| 90 | return;
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| 91 |
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| 92 | case PNG_OPTION_ON:
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| 93 | /* Option turned on */
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| 94 | break;
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| 95 | }
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| 96 | #endif
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| 97 |
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| 98 | /* IMPORTANT: any new internal functions used here must be declared using
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| 99 | * PNG_INTERNAL_FUNCTION in ../pngpriv.h. This is required so that the
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| 100 | * 'prefix' option to configure works:
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| 101 | *
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| 102 | * ./configure --with-libpng-prefix=foobar_
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| 103 | *
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| 104 | * Verify you have got this right by running the above command, doing a build
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| 105 | * and examining pngprefix.h; it must contain a #define for every external
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| 106 | * function you add. (Notice that this happens automatically for the
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| 107 | * initialization function.)
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| 108 | */
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| 109 | pp->read_filter[PNG_FILTER_VALUE_UP-1] = png_read_filter_row_up_vsx;
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| 110 |
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| 111 | if (bpp == 3)
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| 112 | {
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| 113 | pp->read_filter[PNG_FILTER_VALUE_SUB-1] = png_read_filter_row_sub3_vsx;
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| 114 | pp->read_filter[PNG_FILTER_VALUE_AVG-1] = png_read_filter_row_avg3_vsx;
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| 115 | pp->read_filter[PNG_FILTER_VALUE_PAETH-1] = png_read_filter_row_paeth3_vsx;
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| 116 | }
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| 117 |
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| 118 | else if (bpp == 4)
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| 119 | {
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| 120 | pp->read_filter[PNG_FILTER_VALUE_SUB-1] = png_read_filter_row_sub4_vsx;
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| 121 | pp->read_filter[PNG_FILTER_VALUE_AVG-1] = png_read_filter_row_avg4_vsx;
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| 122 | pp->read_filter[PNG_FILTER_VALUE_PAETH-1] = png_read_filter_row_paeth4_vsx;
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| 123 | }
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| 124 | }
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| 125 | #endif /* PNG_POWERPC_VSX_OPT > 0 */
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| 126 | #endif /* READ */
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