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configure.ac: add AC_C_BIGENDIAN

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this defines WORDS_BIGENDIAN, replacing uses of
__BIG_ENDIAN__/__BYTE_ORDER__ with it

+ fixes lossless BGRA output with big-endian toolchains
  that do not define __BIG_ENDIAN__ (codesourcery mips gcc)

Change-Id: Ieaccd623292d235343b5e34b7a720fc251c432d7
This commit is contained in:
James Zern
2014-06-28 12:27:17 -07:00
parent ee70a90187
commit 380cca4f2c
5 changed files with 16 additions and 8 deletions
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4
src/utils/bit_reader_inl.h
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@ -70,7 +70,7 @@ static WEBP_INLINE void VP8LoadNewBytes(VP8BitReader* const br) {
const lbit_t in_bits = *(const lbit_t*)br->buf_;
#endif
br->buf_ += BITS >> 3;
#if !defined(__BIG_ENDIAN__)
#if !defined(WORDS_BIGENDIAN)
#if (BITS > 32)
bits = BSwap64(in_bits);
bits >>= 64 - BITS;
@ -83,7 +83,7 @@ static WEBP_INLINE void VP8LoadNewBytes(VP8BitReader* const br) {
#else // BITS == 8
bits = (bit_t)in_bits;
#endif // BITS > 32
#else // BIG_ENDIAN
#else // WORDS_BIGENDIAN
bits = (bit_t)in_bits;
if (BITS != 8 * sizeof(bit_t)) bits >>= (8 * sizeof(bit_t) - BITS);
#endif