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Diffstat (limited to 'src/main/jni/libwebp/utils/bit_reader_inl.h')
| -rw-r--r-- | src/main/jni/libwebp/utils/bit_reader_inl.h | 172 |
1 files changed, 0 insertions, 172 deletions
diff --git a/src/main/jni/libwebp/utils/bit_reader_inl.h b/src/main/jni/libwebp/utils/bit_reader_inl.h deleted file mode 100644 index 81427c625..000000000 --- a/src/main/jni/libwebp/utils/bit_reader_inl.h +++ /dev/null @@ -1,172 +0,0 @@ -// 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. -// ----------------------------------------------------------------------------- -// -// Specific inlined methods for boolean decoder [VP8GetBit() ...] -// This file should be included by the .c sources that actually need to call -// these methods. -// -// Author: Skal (pascal.massimino@gmail.com) - -#ifndef WEBP_UTILS_BIT_READER_INL_H_ -#define WEBP_UTILS_BIT_READER_INL_H_ - -#ifdef HAVE_CONFIG_H -#include "../webp/config.h" -#endif - -#ifdef WEBP_FORCE_ALIGNED -#include <string.h> // memcpy -#endif - -#include "../dsp/dsp.h" -#include "./bit_reader.h" -#include "./endian_inl.h" - -#ifdef __cplusplus -extern "C" { -#endif - -//------------------------------------------------------------------------------ -// Derived type lbit_t = natural type for memory I/O - -#if (BITS > 32) -typedef uint64_t lbit_t; -#elif (BITS > 16) -typedef uint32_t lbit_t; -#elif (BITS > 8) -typedef uint16_t lbit_t; -#else -typedef uint8_t lbit_t; -#endif - -extern const uint8_t kVP8Log2Range[128]; -extern const range_t kVP8NewRange[128]; - -// special case for the tail byte-reading -void VP8LoadFinalBytes(VP8BitReader* const br); - -//------------------------------------------------------------------------------ -// Inlined critical functions - -// makes sure br->value_ has at least BITS bits worth of data -static WEBP_INLINE void VP8LoadNewBytes(VP8BitReader* const br) { - assert(br != NULL && br->buf_ != NULL); - // Read 'BITS' bits at a time if possible. - if (br->buf_ + sizeof(lbit_t) <= br->buf_end_) { - // convert memory type to register type (with some zero'ing!) - bit_t bits; -#if defined(WEBP_FORCE_ALIGNED) - lbit_t in_bits; - memcpy(&in_bits, br->buf_, sizeof(in_bits)); -#elif defined(WEBP_USE_MIPS32) - // This is needed because of un-aligned read. - lbit_t in_bits; - lbit_t* p_buf_ = (lbit_t*)br->buf_; - __asm__ volatile( - ".set push \n\t" - ".set at \n\t" - ".set macro \n\t" - "ulw %[in_bits], 0(%[p_buf_]) \n\t" - ".set pop \n\t" - : [in_bits]"=r"(in_bits) - : [p_buf_]"r"(p_buf_) - : "memory", "at" - ); -#else - const lbit_t in_bits = *(const lbit_t*)br->buf_; -#endif - br->buf_ += BITS >> 3; -#if !defined(WORDS_BIGENDIAN) -#if (BITS > 32) - bits = BSwap64(in_bits); - bits >>= 64 - BITS; -#elif (BITS >= 24) - bits = BSwap32(in_bits); - bits >>= (32 - BITS); -#elif (BITS == 16) - bits = BSwap16(in_bits); -#else // BITS == 8 - bits = (bit_t)in_bits; -#endif // BITS > 32 -#else // WORDS_BIGENDIAN - bits = (bit_t)in_bits; - if (BITS != 8 * sizeof(bit_t)) bits >>= (8 * sizeof(bit_t) - BITS); -#endif - br->value_ = bits | (br->value_ << BITS); - br->bits_ += BITS; - } else { - VP8LoadFinalBytes(br); // no need to be inlined - } -} - -// Read a bit with proba 'prob'. Speed-critical function! -static WEBP_INLINE int VP8GetBit(VP8BitReader* const br, int prob) { - // Don't move this declaration! It makes a big speed difference to store - // 'range' *before* calling VP8LoadNewBytes(), even if this function doesn't - // alter br->range_ value. - range_t range = br->range_; - if (br->bits_ < 0) { - VP8LoadNewBytes(br); - } - { - const int pos = br->bits_; - const range_t split = (range * prob) >> 8; - const range_t value = (range_t)(br->value_ >> pos); -#if defined(__arm__) || defined(_M_ARM) // ARM-specific - const int bit = ((int)(split - value) >> 31) & 1; - if (value > split) { - range -= split + 1; - br->value_ -= (bit_t)(split + 1) << pos; - } else { - range = split; - } -#else // faster version on x86 - int bit; // Don't use 'const int bit = (value > split);", it's slower. - if (value > split) { - range -= split + 1; - br->value_ -= (bit_t)(split + 1) << pos; - bit = 1; - } else { - range = split; - bit = 0; - } -#endif - if (range <= (range_t)0x7e) { - const int shift = kVP8Log2Range[range]; - range = kVP8NewRange[range]; - br->bits_ -= shift; - } - br->range_ = range; - return bit; - } -} - -// simplified version of VP8GetBit() for prob=0x80 (note shift is always 1 here) -static WEBP_INLINE int VP8GetSigned(VP8BitReader* const br, int v) { - if (br->bits_ < 0) { - VP8LoadNewBytes(br); - } - { - const int pos = br->bits_; - const range_t split = br->range_ >> 1; - const range_t value = (range_t)(br->value_ >> pos); - const int32_t mask = (int32_t)(split - value) >> 31; // -1 or 0 - br->bits_ -= 1; - br->range_ += mask; - br->range_ |= 1; - br->value_ -= (bit_t)((split + 1) & mask) << pos; - return (v ^ mask) - mask; - } -} - -#ifdef __cplusplus -} // extern "C" -#endif - -#endif // WEBP_UTILS_BIT_READER_INL_H_ |