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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/dsp/lossless.c
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@ -1360,7 +1360,7 @@ static void CopyOrSwap(const uint32_t* src, int num_pixels, uint8_t* dst,
while (src < src_end) {
const uint32_t argb = *src++;
#if !defined(__BIG_ENDIAN__)
#if !defined(WORDS_BIGENDIAN)
#if !defined(WEBP_REFERENCE_IMPLEMENTATION)
*(uint32_t*)dst = BSwap32(argb);
#else // WEBP_REFERENCE_IMPLEMENTATION
@ -1369,7 +1369,7 @@ static void CopyOrSwap(const uint32_t* src, int num_pixels, uint8_t* dst,
dst[2] = (argb >> 8) & 0xff;
dst[3] = (argb >> 0) & 0xff;
#endif
#else // __BIG_ENDIAN__
#else // WORDS_BIGENDIAN
dst[0] = (argb >> 0) & 0xff;
dst[1] = (argb >> 8) & 0xff;
dst[2] = (argb >> 16) & 0xff;