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improved encoding speed in t1_encode_cblks (credit to Giuseppe Baruffa)

This commit is contained in:
Antonin Descampe 2011-07-10 17:32:22 +00:00
parent 0358177c3f
commit 6106e48397
2 changed files with 5 additions and 1 deletions
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3
CHANGES
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@ -5,6 +5,9 @@ What's New for OpenJPEG
! : changed ! : changed
+ : added + : added
July 10, 2011
! [antonin] improved encoding speed in t1_encode_cblks (credit to Giuseppe Baruffa)
July 3, 2011 July 3, 2011
* [antonin] fixed bmptoimage (see http://groups.google.com/group/openjpeg/browse_thread/thread/33a24c5896bf6391) * [antonin] fixed bmptoimage (see http://groups.google.com/group/openjpeg/browse_thread/thread/33a24c5896bf6391)
* [antonin] fixed handling of "jp2->meth" value (Restricted ICC profile handling currently not implemented) * [antonin] fixed handling of "jp2->meth" value (Restricted ICC profile handling currently not implemented)

3
libopenjpeg/t1.c
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@ -1413,6 +1413,7 @@ void t1_encode_cblks(
for (bandno = 0; bandno < res->numbands; ++bandno) { for (bandno = 0; bandno < res->numbands; ++bandno) {
opj_tcd_band_t* restrict band = &res->bands[bandno]; opj_tcd_band_t* restrict band = &res->bands[bandno];
int bandconst = 8192 * 8192 / ((int) floor(band->stepsize * 8192));
for (precno = 0; precno < res->pw * res->ph; ++precno) { for (precno = 0; precno < res->pw * res->ph; ++precno) {
opj_tcd_precinct_t *prc = &band->precincts[precno]; opj_tcd_precinct_t *prc = &band->precincts[precno];
@ -1463,7 +1464,7 @@ void t1_encode_cblks(
datap[(j * cblk_w) + i] = datap[(j * cblk_w) + i] =
fix_mul( fix_mul(
tmp, tmp,
8192 * 8192 / ((int) floor(band->stepsize * 8192))) >> (11 - T1_NMSEDEC_FRACBITS); bandconst) >> (11 - T1_NMSEDEC_FRACBITS);
} }
} }
} }