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/t1.c | |
| 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/t1.c')
| -rw-r--r-- | src/lib/openjp2/t1.c | 6 |
1 files changed, 2 insertions, 4 deletions
diff --git a/src/lib/openjp2/t1.c b/src/lib/openjp2/t1.c index 760b9ab1..15e166f2 100644 --- a/src/lib/openjp2/t1.c +++ b/src/lib/openjp2/t1.c @@ -1802,7 +1802,7 @@ void opj_t1_decode_cblks(opj_tcd_t* tcd, /* TODO: remove this once we don't iterate over */ /* tile pixels that are not in the subwindow of interest */ - OPJ_UINT32 j, i; + OPJ_UINT32 j; OPJ_INT32 x = cblk->x0 - band->x0; OPJ_INT32 y = cblk->y0 - band->y0; OPJ_INT32* OPJ_RESTRICT tiledp; @@ -1823,9 +1823,7 @@ void opj_t1_decode_cblks(opj_tcd_t* tcd, (OPJ_UINT32)x]; for (j = 0; j < cblk_h; ++j) { - for (i = 0; i < cblk_w; ++i) { - ((OPJ_INT32*)tiledp)[(j * tile_w) + i] = 0; - } + memset(tiledp + j * tile_w, 0, cblk_w * sizeof(OPJ_INT32)); } continue; } |