dany/libwebp
1
0
Fork 0
mirror of https://github.com/webmproject/libwebp.git synced 2025-07-14 21:09:55 +02:00
Code Issues Actions Packages Projects Releases Wiki Activity

Speedup for decoding lossless WebP photographs:

Browse Source 
use bit_pos instead num_bit to update the bit-reader
37.69 MB/s -> 39.79 MB/s, 5.6 %

Change-Id: Ica476cc3e2fc2db084d6961bea8586b050bb221d
This commit is contained in:
skal
2013-06-18 17:26:52 +02:00
parent 24ee098a00
commit 313d853fa9
4 changed files with 13 additions and 12 deletions
Download Patch File Download Diff File Expand all files Collapse all files

7
src/utils/bit_reader.h
View File

@ -316,9 +316,10 @@ static WEBP_INLINE uint32_t VP8LPrefetchBits(VP8LBitReader* const br) {
return (uint32_t)(br->val_ >> br->bit_pos_);
}
// Discard 'num_bits' bits from the cache.
static WEBP_INLINE void VP8LDiscardBits(VP8LBitReader* const br, int num_bits) {
br->bit_pos_ += num_bits;
// For jumping over a number of bits in the bit stream when accessed with
// VP8LPrefetchBits and VP8LFillBitWindow.
static WEBP_INLINE void VP8LSetBitPos(VP8LBitReader* const br, int val) {
br->bit_pos_ = val;
}
// Advances the Read buffer by 4 bytes to make room for reading next 32 bits.