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
7 years ago
|
|
||
|
|
/* powerpc_init.c - POWERPC optimised filter functions
|
||
|
|
*
|
||
|
|
* Copyright (c) 2017 Glenn Randers-Pehrson
|
||
|
|
* Written by Vadim Barkov, 2017.
|
||
|
|
* Last changed in libpng 1.6.29 [March 16, 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 */
|