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libwebp: Sync with upstream 1.0.2

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This commit is contained in:
Rémi Verschelde
2019-03-04 13:02:20 +01:00
parent 2bc981948d
commit 93f6a065f8
17 changed files with 492 additions and 164 deletions
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26
thirdparty/libwebp/src/utils/utils.h vendored
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@@ -107,19 +107,6 @@ static WEBP_INLINE void PutLE32(uint8_t* const data, uint32_t val) {
PutLE16(data + 2, (int)(val >> 16));
}
// Returns 31 ^ clz(n) = log2(n). This is the default C-implementation, either
// based on table or not. Can be used as fallback if clz() is not available.
#define WEBP_NEED_LOG_TABLE_8BIT
extern const uint8_t WebPLogTable8bit[256];
static WEBP_INLINE int WebPLog2FloorC(uint32_t n) {
int log_value = 0;
while (n >= 256) {
log_value += 8;
n >>= 8;
}
return log_value + WebPLogTable8bit[n];
}
// Returns (int)floor(log2(n)). n must be > 0.
// use GNU builtins where available.
#if defined(__GNUC__) && \
@@ -138,6 +125,19 @@ static WEBP_INLINE int BitsLog2Floor(uint32_t n) {
return first_set_bit;
}
#else // default: use the C-version.
// Returns 31 ^ clz(n) = log2(n). This is the default C-implementation, either
// based on table or not. Can be used as fallback if clz() is not available.
#define WEBP_NEED_LOG_TABLE_8BIT
extern const uint8_t WebPLogTable8bit[256];
static WEBP_INLINE int WebPLog2FloorC(uint32_t n) {
int log_value = 0;
while (n >= 256) {
log_value += 8;
n >>= 8;
}
return log_value + WebPLogTable8bit[n];
}
static WEBP_INLINE int BitsLog2Floor(uint32_t n) { return WebPLog2FloorC(n); }
#endif