diff options
Diffstat (limited to 'Build/source/libs/libpng/libpng-1.6.2/arm/arm_init.c')
-rw-r--r-- | Build/source/libs/libpng/libpng-1.6.2/arm/arm_init.c | 219 |
1 files changed, 0 insertions, 219 deletions
diff --git a/Build/source/libs/libpng/libpng-1.6.2/arm/arm_init.c b/Build/source/libs/libpng/libpng-1.6.2/arm/arm_init.c deleted file mode 100644 index 795dd493880..00000000000 --- a/Build/source/libs/libpng/libpng-1.6.2/arm/arm_init.c +++ /dev/null @@ -1,219 +0,0 @@ - -/* arm_init.c - NEON optimised filter functions - * - * Copyright (c) 2013 Glenn Randers-Pehrson - * Written by Mans Rullgard, 2011. - * Last changed in libpng 1.5.15 [March 28, 2013] - * - * 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 "../pngpriv.h" - -#ifdef PNG_ARM_NEON_SUPPORTED -#ifdef PNG_ARM_NEON_CHECK_SUPPORTED /* Do run-time checks */ -#include <signal.h> /* for sig_atomic_t */ - -#ifdef __ANDROID__ -/* Linux provides access to information about CPU capabilites via - * /proc/self/auxv, however Android blocks this while still claiming to be - * Linux. The Andoid NDK, however, provides appropriate support. - * - * Documentation: http://www.kandroid.org/ndk/docs/CPU-ARM-NEON.html - */ -#include <cpu-features.h> - -static int -png_have_neon(png_structp png_ptr) -{ - /* This is a whole lot easier than the mess below, however it is probably - * implemented as below, therefore it is better to cache the result (these - * function calls may be slow!) - */ - PNG_UNUSED(png_ptr) - return android_getCpuFamily() == ANDROID_CPU_FAMILY_ARM && - (android_getCpuFeatures() & ANDROID_CPU_ARM_FEATURE_NEON) != 0; -} -#elif defined(__linux__) -/* The generic __linux__ implementation requires reading /proc/self/auxv and - * looking at each element for one that records NEON capabilities. - */ -#include <unistd.h> /* for POSIX 1003.1 */ -#include <errno.h> /* for EINTR */ - -#include <sys/types.h> -#include <sys/stat.h> -#include <fcntl.h> -#include <elf.h> -#include <asm/hwcap.h> - -/* A read call may be interrupted, in which case it returns -1 and sets errno to - * EINTR if nothing was done, otherwise (if something was done) a partial read - * may result. - */ -static size_t -safe_read(png_structp png_ptr, int fd, void *buffer_in, size_t nbytes) -{ - size_t ntotal = 0; - char *buffer = png_voidcast(char*, buffer_in); - - while (nbytes > 0) - { - unsigned int nread; - int iread; - - /* Passing nread > INT_MAX to read is implementation defined in POSIX - * 1003.1, therefore despite the unsigned argument portable code must - * limit the value to INT_MAX! - */ - if (nbytes > INT_MAX) - nread = INT_MAX; - - else - nread = (unsigned int)/*SAFE*/nbytes; - - iread = read(fd, buffer, nread); - - if (iread == -1) - { - /* This is the devil in the details, a read can terminate early with 0 - * bytes read because of EINTR, yet it still returns -1 otherwise end - * of file cannot be distinguished. - */ - if (errno != EINTR) - { - png_warning(png_ptr, "/proc read failed"); - return 0; /* I.e. a permanent failure */ - } - } - - else if (iread < 0) - { - /* Not a valid 'read' result: */ - png_warning(png_ptr, "OS /proc read bug"); - return 0; - } - - else if (iread > 0) - { - /* Continue reading until a permanent failure, or EOF */ - buffer += iread; - nbytes -= (unsigned int)/*SAFE*/iread; - ntotal += (unsigned int)/*SAFE*/iread; - } - - else - return ntotal; - } - - return ntotal; /* nbytes == 0 */ -} - -static int -png_have_neon(png_structp png_ptr) -{ - int fd = open("/proc/self/auxv", O_RDONLY); - Elf32_auxv_t aux; - - /* Failsafe: failure to open means no NEON */ - if (fd == -1) - { - png_warning(png_ptr, "/proc/self/auxv open failed"); - return 0; - } - - while (safe_read(png_ptr, fd, &aux, sizeof aux) == sizeof aux) - { - if (aux.a_type == AT_HWCAP && (aux.a_un.a_val & HWCAP_NEON) != 0) - { - close(fd); - return 1; - } - } - - close(fd); - return 0; -} -#else - /* We don't know how to do a run-time check on this system */ -# error "no support for run-time ARM NEON checks" -#endif /* OS checks */ -#endif /* PNG_ARM_NEON_CHECK_SUPPORTED */ - -#ifndef PNG_ALIGNED_MEMORY_SUPPORTED -# error "ALIGNED_MEMORY is required; set: -DPNG_ALIGNED_MEMORY_SUPPORTED" -#endif - -void -png_init_filter_functions_neon(png_structp pp, unsigned int bpp) -{ -#ifdef PNG_ARM_NEON_API_SUPPORTED - switch ((pp->options >> PNG_ARM_NEON) & 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_ARM_NEON_API_SUPPORTED */ -#ifdef PNG_ARM_NEON_CHECK_SUPPORTED - { - static volatile sig_atomic_t no_neon = -1; /* not checked */ - - if (no_neon < 0) - no_neon = !png_have_neon(pp); - - if (no_neon) - return; - } -#ifdef PNG_ARM_NEON_API_SUPPORTED - break; -#endif -#endif /* PNG_ARM_NEON_CHECK_SUPPORTED */ -#ifdef PNG_ARM_NEON_API_SUPPORTED - case PNG_OPTION_ON: - /* Option turned on */ - break; - - default: /* OFF or INVALID */ - return; - } -#endif - - /* IMPORTANT: any new external 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_neon; - - if (bpp == 3) - { - pp->read_filter[PNG_FILTER_VALUE_SUB-1] = png_read_filter_row_sub3_neon; - pp->read_filter[PNG_FILTER_VALUE_AVG-1] = png_read_filter_row_avg3_neon; - pp->read_filter[PNG_FILTER_VALUE_PAETH-1] = - png_read_filter_row_paeth3_neon; - } - - else if (bpp == 4) - { - pp->read_filter[PNG_FILTER_VALUE_SUB-1] = png_read_filter_row_sub4_neon; - pp->read_filter[PNG_FILTER_VALUE_AVG-1] = png_read_filter_row_avg4_neon; - pp->read_filter[PNG_FILTER_VALUE_PAETH-1] = - png_read_filter_row_paeth4_neon; - } -} -#endif /* FILTER_OPTIMIZATIONS && __arm__ && __ARM_NEON__ */ |