diff options
Diffstat (limited to 'third_party/jpeg-xl/lib/jxl/dec_ans.h')
| -rw-r--r-- | third_party/jpeg-xl/lib/jxl/dec_ans.h | 13 |
1 files changed, 8 insertions, 5 deletions
diff --git a/third_party/jpeg-xl/lib/jxl/dec_ans.h b/third_party/jpeg-xl/lib/jxl/dec_ans.h index 57faad25a7..cbff1deebe 100644 --- a/third_party/jpeg-xl/lib/jxl/dec_ans.h +++ b/third_party/jpeg-xl/lib/jxl/dec_ans.h @@ -9,6 +9,7 @@ // Library to decode the ANS population counts from the bit-stream and build a // decoding table from them. +#include <jxl/types.h> #include <stddef.h> #include <stdint.h> @@ -133,6 +134,11 @@ static constexpr int8_t kSpecialDistances[kNumSpecialDistances][2] = { {8, 0}, {4, 7}, {-4, 7}, {7, 4}, {-7, 4}, {8, 1}, {8, 2}, {6, 6}, {-6, 6}, {8, 3}, {5, 7}, {-5, 7}, {7, 5}, {-7, 5}, {8, 4}, {6, 7}, {-6, 7}, {7, 6}, {-7, 6}, {8, 5}, {7, 7}, {-7, 7}, {8, 6}, {8, 7}}; +static JXL_INLINE int SpecialDistance(size_t index, int multiplier) { + int dist = kSpecialDistances[index][0] + + static_cast<int>(multiplier) * kSpecialDistances[index][1]; + return (dist > 1) ? dist : 1; +} struct ANSCode { CacheAlignedUniquePtr alias_tables; @@ -179,10 +185,7 @@ class ANSSymbolReader { num_special_distances_ = distance_multiplier == 0 ? 0 : kNumSpecialDistances; for (size_t i = 0; i < num_special_distances_; i++) { - int dist = kSpecialDistances[i][0]; - dist += static_cast<int>(distance_multiplier) * kSpecialDistances[i][1]; - if (dist < 1) dist = 1; - special_distances_[i] = dist; + special_distances_[i] = SpecialDistance(i, distance_multiplier); } } @@ -196,7 +199,7 @@ class ANSSymbolReader { AliasTable::Lookup(table, res, log_entry_size_, entry_size_minus_1_); state_ = symbol.freq * (state_ >> ANS_LOG_TAB_SIZE) + symbol.offset; -#if 1 +#if JXL_TRUE // Branchless version is about equally fast on SKX. const uint32_t new_state = (state_ << 16u) | static_cast<uint32_t>(br->PeekFixedBits<16>()); |