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authorMatt A. Tobin <email@mattatobin.com>2018-02-03 08:48:48 -0500
committerMatt A. Tobin <email@mattatobin.com>2018-02-03 08:48:48 -0500
commitc6856f968b8c85502f14c6c3412b00a05fc0c0de (patch)
treec0720fdf31018c72fcb69134f2e9667d16970c3a /media/libwebp/utils/endian_inl_utils.h
parent36f73c8cd27e62cbd3e85939d6fe11a240e3416f (diff)
parent1e1fb5ea2504e548bc17521bdb273c9e59b9cf01 (diff)
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Merge branch 'master' into configurebuild-work
Diffstat (limited to 'media/libwebp/utils/endian_inl_utils.h')
-rw-r--r--media/libwebp/utils/endian_inl_utils.h100
1 files changed, 100 insertions, 0 deletions
diff --git a/media/libwebp/utils/endian_inl_utils.h b/media/libwebp/utils/endian_inl_utils.h
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+++ b/media/libwebp/utils/endian_inl_utils.h
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+// Copyright 2014 Google Inc. All Rights Reserved.
+//
+// Use of this source code is governed by a BSD-style license
+// that can be found in the COPYING file in the root of the source
+// tree. An additional intellectual property rights grant can be found
+// in the file PATENTS. All contributing project authors may
+// be found in the AUTHORS file in the root of the source tree.
+// -----------------------------------------------------------------------------
+//
+// Endian related functions.
+
+#ifndef WEBP_UTILS_ENDIAN_INL_H_
+#define WEBP_UTILS_ENDIAN_INL_H_
+
+#ifdef HAVE_CONFIG_H
+#include "../webp/config.h"
+#endif
+
+#include "../dsp/dsp.h"
+#include "../webp/types.h"
+
+// some endian fix (e.g.: mips-gcc doesn't define __BIG_ENDIAN__)
+#if !defined(WORDS_BIGENDIAN) && \
+ (defined(__BIG_ENDIAN__) || defined(_M_PPC) || \
+ (defined(__BYTE_ORDER__) && (__BYTE_ORDER__ == __ORDER_BIG_ENDIAN__)))
+#define WORDS_BIGENDIAN
+#endif
+
+#if defined(WORDS_BIGENDIAN)
+#define HToLE32 BSwap32
+#define HToLE16 BSwap16
+#else
+#define HToLE32(x) (x)
+#define HToLE16(x) (x)
+#endif
+
+#if !defined(HAVE_CONFIG_H)
+#if LOCAL_GCC_PREREQ(4,8) || __has_builtin(__builtin_bswap16)
+#define HAVE_BUILTIN_BSWAP16
+#endif
+#if LOCAL_GCC_PREREQ(4,3) || __has_builtin(__builtin_bswap32)
+#define HAVE_BUILTIN_BSWAP32
+#endif
+#if LOCAL_GCC_PREREQ(4,3) || __has_builtin(__builtin_bswap64)
+#define HAVE_BUILTIN_BSWAP64
+#endif
+#endif // !HAVE_CONFIG_H
+
+static WEBP_INLINE uint16_t BSwap16(uint16_t x) {
+#if defined(HAVE_BUILTIN_BSWAP16)
+ return __builtin_bswap16(x);
+#elif defined(_MSC_VER)
+ return _byteswap_ushort(x);
+#else
+ // gcc will recognize a 'rorw $8, ...' here:
+ return (x >> 8) | ((x & 0xff) << 8);
+#endif // HAVE_BUILTIN_BSWAP16
+}
+
+static WEBP_INLINE uint32_t BSwap32(uint32_t x) {
+#if defined(WEBP_USE_MIPS32_R2)
+ uint32_t ret;
+ __asm__ volatile (
+ "wsbh %[ret], %[x] \n\t"
+ "rotr %[ret], %[ret], 16 \n\t"
+ : [ret]"=r"(ret)
+ : [x]"r"(x)
+ );
+ return ret;
+#elif defined(HAVE_BUILTIN_BSWAP32)
+ return __builtin_bswap32(x);
+#elif defined(__i386__) || defined(__x86_64__)
+ uint32_t swapped_bytes;
+ __asm__ volatile("bswap %0" : "=r"(swapped_bytes) : "0"(x));
+ return swapped_bytes;
+#elif defined(_MSC_VER)
+ return (uint32_t)_byteswap_ulong(x);
+#else
+ return (x >> 24) | ((x >> 8) & 0xff00) | ((x << 8) & 0xff0000) | (x << 24);
+#endif // HAVE_BUILTIN_BSWAP32
+}
+
+static WEBP_INLINE uint64_t BSwap64(uint64_t x) {
+#if defined(HAVE_BUILTIN_BSWAP64)
+ return __builtin_bswap64(x);
+#elif defined(__x86_64__)
+ uint64_t swapped_bytes;
+ __asm__ volatile("bswapq %0" : "=r"(swapped_bytes) : "0"(x));
+ return swapped_bytes;
+#elif defined(_MSC_VER)
+ return (uint64_t)_byteswap_uint64(x);
+#else // generic code for swapping 64-bit values (suggested by bdb@)
+ x = ((x & 0xffffffff00000000ull) >> 32) | ((x & 0x00000000ffffffffull) << 32);
+ x = ((x & 0xffff0000ffff0000ull) >> 16) | ((x & 0x0000ffff0000ffffull) << 16);
+ x = ((x & 0xff00ff00ff00ff00ull) >> 8) | ((x & 0x00ff00ff00ff00ffull) << 8);
+ return x;
+#endif // HAVE_BUILTIN_BSWAP64
+}
+
+#endif // WEBP_UTILS_ENDIAN_INL_H_