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src/Source/LibWebP/src/dsp/dsp.dec_clip_tables.c  view on Meta::CPAN

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};

#else

// uninitialized tables
static uint8_t abs0[255 + 255 + 1];
static int8_t sclip1[1020 + 1020 + 1];
static int8_t sclip2[112 + 112 + 1];
static uint8_t clip1[255 + 511 + 1];

// We declare this variable 'volatile' to prevent instruction reordering
// and make sure it's set to true _last_ (so as to be thread-safe)
static volatile int tables_ok = 0;

#endif

const int8_t* const VP8ksclip1 = &sclip1[1020];
const int8_t* const VP8ksclip2 = &sclip2[112];
const uint8_t* const VP8kclip1 = &clip1[255];
const uint8_t* const VP8kabs0 = &abs0[255];

WEBP_TSAN_IGNORE_FUNCTION void VP8InitClipTables(void) {
#if !defined(USE_STATIC_TABLES)
  int i;
  if (!tables_ok) {
    for (i = -255; i <= 255; ++i) {
      abs0[255 + i] = (i < 0) ? -i : i;
    }
    for (i = -1020; i <= 1020; ++i) {
      sclip1[1020 + i] = (i < -128) ? -128 : (i > 127) ? 127 : i;
    }
    for (i = -112; i <= 112; ++i) {
      sclip2[112 + i] = (i < -16) ? -16 : (i > 15) ? 15 : i;
    }
    for (i = -255; i <= 255 + 255; ++i) {
      clip1[255 + i] = (i < 0) ? 0 : (i > 255) ? 255 : i;
    }
    tables_ok = 1;
  }
#endif    // USE_STATIC_TABLES
}