dany/libwebp
1
0
Fork 0
mirror of https://github.com/webmproject/libwebp.git synced 2025-07-16 22:09:57 +02:00
Code Issues Actions Packages Projects Releases Wiki Activity

Move the HuffmanCost() function to dsp lib

Browse Source 
This is to help further optimizations.
(like in https://gerrit.chromium.org/gerrit/#/c/69787/)

There's a small slowdown (~0.5% at -z 9 quality) due to
function pointer usage. Note that, for speed, it's important
to return VP8LStreaks by value, and not pass a pointer.

Change-Id: Id4167366765fb7fc5dff89c1fd75dee456737000
This commit is contained in:
skal
2014-04-18 08:14:46 -07:00
parent 6653b601ef
commit 75b12006e3
4 changed files with 82 additions and 64 deletions
Download Patch File Download Diff File Expand all files Collapse all files

7
src/enc/histogram.h
View File

@ -90,13 +90,6 @@ static WEBP_INLINE int VP8LHistogramNumCodes(int palette_code_bits) {
((palette_code_bits > 0) ? (1 << palette_code_bits) : 0);
}
// Used to finalized the Huffman cost:
// cnt_z / cnt_nz: counts the number of 0's and non-0's
// streak_{z,nz}_le3 / streak_{z,nz}_gt3: number of streaks larger than 3
// or less-or-equal than 3.
double VP8FinalHuffmanCost(int cnt_z, int streak_z_le3, int streak_z_gt3,
int cnt_nz, int streak_nz_le3, int streak_nz_gt3);
// Builds the histogram image.
int VP8LGetHistoImageSymbols(int xsize, int ysize,
const VP8LBackwardRefs* const refs,