mirror of https://github.com/opencv/opencv.git
Open Source Computer Vision Library
https://opencv.org/
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
126 lines
4.2 KiB
126 lines
4.2 KiB
|
|
/* powerpc_init.c - POWERPC optimised filter functions |
|
* |
|
* Copyright (c) 2018 Cosmin Truta |
|
* Copyright (c) 2017 Glenn Randers-Pehrson |
|
* Written by Vadim Barkov, 2017. |
|
* |
|
* This code is released under the libpng license. |
|
* For conditions of distribution and use, see the disclaimer |
|
* and license in png.h |
|
*/ |
|
|
|
/* Below, after checking __linux__, various non-C90 POSIX 1003.1 functions are |
|
* called. |
|
*/ |
|
#define _POSIX_SOURCE 1 |
|
|
|
#include <stdio.h> |
|
#include "../pngpriv.h" |
|
|
|
#ifdef PNG_READ_SUPPORTED |
|
|
|
#if PNG_POWERPC_VSX_OPT > 0 |
|
#ifdef PNG_POWERPC_VSX_CHECK_SUPPORTED /* Do run-time checks */ |
|
/* WARNING: it is strongly recommended that you do not build libpng with |
|
* run-time checks for CPU features if at all possible. In the case of the PowerPC |
|
* VSX instructions there is no processor-specific way of detecting the |
|
* presence of the required support, therefore run-time detection is extremely |
|
* OS specific. |
|
* |
|
* You may set the macro PNG_POWERPC_VSX_FILE to the file name of file containing |
|
* a fragment of C source code which defines the png_have_vsx function. There |
|
* are a number of implementations in contrib/powerpc-vsx, but the only one that |
|
* has partial support is contrib/powerpc-vsx/linux.c - a generic Linux |
|
* implementation which reads /proc/cpufino. |
|
*/ |
|
#ifndef PNG_POWERPC_VSX_FILE |
|
# ifdef __linux__ |
|
# define PNG_POWERPC_VSX_FILE "contrib/powerpc-vsx/linux_aux.c" |
|
# endif |
|
#endif |
|
|
|
#ifdef PNG_POWERPC_VSX_FILE |
|
|
|
#include <signal.h> /* for sig_atomic_t */ |
|
static int png_have_vsx(png_structp png_ptr); |
|
#include PNG_POWERPC_VSX_FILE |
|
|
|
#else /* PNG_POWERPC_VSX_FILE */ |
|
# error "PNG_POWERPC_VSX_FILE undefined: no support for run-time POWERPC VSX checks" |
|
#endif /* PNG_POWERPC_VSX_FILE */ |
|
#endif /* PNG_POWERPC_VSX_CHECK_SUPPORTED */ |
|
|
|
void |
|
png_init_filter_functions_vsx(png_structp pp, unsigned int bpp) |
|
{ |
|
/* The switch statement is compiled in for POWERPC_VSX_API, the call to |
|
* png_have_vsx is compiled in for POWERPC_VSX_CHECK. If both are defined |
|
* the check is only performed if the API has not set the PowerPC option on |
|
* or off explicitly. In this case the check controls what happens. |
|
*/ |
|
|
|
#ifdef PNG_POWERPC_VSX_API_SUPPORTED |
|
switch ((pp->options >> PNG_POWERPC_VSX) & 3) |
|
{ |
|
case PNG_OPTION_UNSET: |
|
/* Allow the run-time check to execute if it has been enabled - |
|
* thus both API and CHECK can be turned on. If it isn't supported |
|
* this case will fall through to the 'default' below, which just |
|
* returns. |
|
*/ |
|
#endif /* PNG_POWERPC_VSX_API_SUPPORTED */ |
|
#ifdef PNG_POWERPC_VSX_CHECK_SUPPORTED |
|
{ |
|
static volatile sig_atomic_t no_vsx = -1; /* not checked */ |
|
|
|
if (no_vsx < 0) |
|
no_vsx = !png_have_vsx(pp); |
|
|
|
if (no_vsx) |
|
return; |
|
} |
|
#ifdef PNG_POWERPC_VSX_API_SUPPORTED |
|
break; |
|
#endif |
|
#endif /* PNG_POWERPC_VSX_CHECK_SUPPORTED */ |
|
|
|
#ifdef PNG_POWERPC_VSX_API_SUPPORTED |
|
default: /* OFF or INVALID */ |
|
return; |
|
|
|
case PNG_OPTION_ON: |
|
/* Option turned on */ |
|
break; |
|
} |
|
#endif |
|
|
|
/* IMPORTANT: any new internal 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.) |
|
*/ |
|
pp->read_filter[PNG_FILTER_VALUE_UP-1] = png_read_filter_row_up_vsx; |
|
|
|
if (bpp == 3) |
|
{ |
|
pp->read_filter[PNG_FILTER_VALUE_SUB-1] = png_read_filter_row_sub3_vsx; |
|
pp->read_filter[PNG_FILTER_VALUE_AVG-1] = png_read_filter_row_avg3_vsx; |
|
pp->read_filter[PNG_FILTER_VALUE_PAETH-1] = png_read_filter_row_paeth3_vsx; |
|
} |
|
|
|
else if (bpp == 4) |
|
{ |
|
pp->read_filter[PNG_FILTER_VALUE_SUB-1] = png_read_filter_row_sub4_vsx; |
|
pp->read_filter[PNG_FILTER_VALUE_AVG-1] = png_read_filter_row_avg4_vsx; |
|
pp->read_filter[PNG_FILTER_VALUE_PAETH-1] = png_read_filter_row_paeth4_vsx; |
|
} |
|
} |
|
#endif /* PNG_POWERPC_VSX_OPT > 0 */ |
|
#endif /* READ */
|
|
|