diff options
| author | Even Rouault <even.rouault@spatialys.com> | 2017-08-18 15:08:51 +0200 |
|---|---|---|
| committer | Even Rouault <even.rouault@spatialys.com> | 2017-08-18 15:08:51 +0200 |
| commit | 5d403250561398f7ba3041d9eb8c893bd680dd72 (patch) | |
| tree | f0da191cd421b212901c8e982d021649f9d60e2c /src/lib/openjp2/opj_intmath.h | |
| parent | 028c504a43e962a725c4fd73d6642ee73c653e1b (diff) | |
Subtile decoding: only do 5x3 IDWT computations on relevant areas of tile-component buffer.
This lowers 'bin/opj_decompress -i ../MAPA.jp2 -o out.tif -d 0,0,256,256'
down to 0.860s
Diffstat (limited to 'src/lib/openjp2/opj_intmath.h')
| -rw-r--r-- | src/lib/openjp2/opj_intmath.h | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/src/lib/openjp2/opj_intmath.h b/src/lib/openjp2/opj_intmath.h index cf97c15b..d7d85e52 100644 --- a/src/lib/openjp2/opj_intmath.h +++ b/src/lib/openjp2/opj_intmath.h @@ -96,6 +96,15 @@ static INLINE OPJ_UINT32 opj_uint_adds(OPJ_UINT32 a, OPJ_UINT32 b) } /** + Get the saturated difference of two unsigned integers + @return Returns saturated sum of a-b + */ +static INLINE OPJ_UINT32 opj_uint_subs(OPJ_UINT32 a, OPJ_UINT32 b) +{ + return (a >= b) ? a - b : 0; +} + +/** Clamp an integer inside an interval @return <ul> |