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Member "pngcrush-1.8.13/mips_init.c" (31 Aug 2016, 4354 Bytes) of package /linux/privat/pngcrush-1.8.13.tar.gz:


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    1 
    2 /* mips_init.c - MSA optimised filter functions
    3  *
    4  * Copyright (c) 2016 Glenn Randers-Pehrson
    5  * Written by Mandar Sahastrabuddhe, 2016.
    6  * Last changed in libpng 1.6.25 [(PENDING RELEASE)]
    7  *
    8  * This code is released under the libpng license.
    9  * For conditions of distribution and use, see the disclaimer
   10  * and license in png.h
   11  */
   12 /* Below, after checking __linux__, various non-C90 POSIX 1003.1 functions are
   13  * called.
   14  */
   15 #define _POSIX_SOURCE 1
   16 
   17 #include <stdio.h>
   18 #include "pngpriv.h"
   19 
   20 #ifdef PNG_READ_SUPPORTED
   21 
   22 #if PNG_MIPS_MSA_OPT > 0
   23 #ifdef PNG_MIPS_MSA_CHECK_SUPPORTED /* Do run-time checks */
   24 /* WARNING: it is strongly recommended that you do not build libpng with
   25  * run-time checks for CPU features if at all possible.  In the case of the MIPS
   26  * MSA instructions there is no processor-specific way of detecting the
   27  * presence of the required support, therefore run-time detection is extremely
   28  * OS specific.
   29  *
   30  * You may set the macro PNG_MIPS_MSA_FILE to the file name of file containing
   31  * a fragment of C source code which defines the png_have_msa function.  There
   32  * are a number of implementations in contrib/mips-msa, but the only one that
   33  * has partial support is contrib/mips-msa/linux.c - a generic Linux
   34  * implementation which reads /proc/cpufino.
   35  */
   36 #ifndef PNG_MIPS_MSA_FILE
   37 #  ifdef __linux__
   38 #     define PNG_MIPS_MSA_FILE "contrib/mips-msa/linux.c"
   39 #  endif
   40 #endif
   41 
   42 #ifdef PNG_MIPS_MSA_FILE
   43 
   44 #include <signal.h> /* for sig_atomic_t */
   45 static int png_have_msa(png_structp png_ptr);
   46 #include PNG_MIPS_MSA_FILE
   47 
   48 #else  /* PNG_MIPS_MSA_FILE */
   49 #  error "PNG_MIPS_MSA_FILE undefined: no support for run-time MIPS MSA checks"
   50 #endif /* PNG_MIPS_MSA_FILE */
   51 #endif /* PNG_MIPS_MSA_CHECK_SUPPORTED */
   52 
   53 #ifndef PNG_ALIGNED_MEMORY_SUPPORTED
   54 #  error "ALIGNED_MEMORY is required; set: -DPNG_ALIGNED_MEMORY_SUPPORTED"
   55 #endif
   56 
   57 void
   58 png_init_filter_functions_msa(png_structp pp, unsigned int bpp)
   59 {
   60    /* The switch statement is compiled in for MIPS_MSA_API, the call to
   61     * png_have_msa is compiled in for MIPS_MSA_CHECK. If both are defined
   62     * the check is only performed if the API has not set the MSA option on
   63     * or off explicitly. In this case the check controls what happens.
   64     */
   65 
   66 #ifdef PNG_MIPS_MSA_API_SUPPORTED
   67    switch ((pp->options >> PNG_MIPS_MSA) & 3)
   68    {
   69       case PNG_OPTION_UNSET:
   70          /* Allow the run-time check to execute if it has been enabled -
   71           * thus both API and CHECK can be turned on.  If it isn't supported
   72           * this case will fall through to the 'default' below, which just
   73           * returns.
   74           */
   75 #endif /* PNG_MIPS_MSA_API_SUPPORTED */
   76 #ifdef PNG_MIPS_MSA_CHECK_SUPPORTED
   77          {
   78             static volatile sig_atomic_t no_msa = -1; /* not checked */
   79 
   80             if (no_msa < 0)
   81                no_msa = !png_have_msa(pp);
   82 
   83             if (no_msa)
   84                return;
   85          }
   86 #ifdef PNG_MIPS_MSA_API_SUPPORTED
   87          break;
   88 #endif
   89 #endif /* PNG_MIPS_MSA_CHECK_SUPPORTED */
   90 
   91 #ifdef PNG_MIPS_MSA_API_SUPPORTED
   92       default: /* OFF or INVALID */
   93          return;
   94 
   95       case PNG_OPTION_ON:
   96          /* Option turned on */
   97          break;
   98    }
   99 #endif
  100 
  101    /* IMPORTANT: any new external functions used here must be declared using
  102     * PNG_INTERNAL_FUNCTION in ../pngpriv.h.  This is required so that the
  103     * 'prefix' option to configure works:
  104     *
  105     *    ./configure --with-libpng-prefix=foobar_
  106     *
  107     * Verify you have got this right by running the above command, doing a build
  108     * and examining pngprefix.h; it must contain a #define for every external
  109     * function you add.  (Notice that this happens automatically for the
  110     * initialization function.)
  111     */
  112    pp->read_filter[PNG_FILTER_VALUE_UP-1] = png_read_filter_row_up_msa;
  113 
  114    if (bpp == 3)
  115    {
  116       pp->read_filter[PNG_FILTER_VALUE_SUB-1] = png_read_filter_row_sub3_msa;
  117       pp->read_filter[PNG_FILTER_VALUE_AVG-1] = png_read_filter_row_avg3_msa;
  118       pp->read_filter[PNG_FILTER_VALUE_PAETH-1] = png_read_filter_row_paeth3_msa;
  119    }
  120 
  121    else if (bpp == 4)
  122    {
  123       pp->read_filter[PNG_FILTER_VALUE_SUB-1] = png_read_filter_row_sub4_msa;
  124       pp->read_filter[PNG_FILTER_VALUE_AVG-1] = png_read_filter_row_avg4_msa;
  125       pp->read_filter[PNG_FILTER_VALUE_PAETH-1] = png_read_filter_row_paeth4_msa;
  126    }
  127 }
  128 #endif /* PNG_MIPS_MSA_OPT > 0 */
  129 #endif /* READ */