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Replaced the large ctxno_mag lookup table with a small bit of inline-able branchless code

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Francois-Olivier Devaux
2007-08-21 12:42:55 +00:00
parent 1cfbdcc9ce
commit 2952874cb8
4 changed files with 6 additions and 288 deletions
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8
libopenjpeg/t1.c
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@@ -41,7 +41,7 @@
static char t1_getctxno_zc(int f, int orient);
static char t1_getctxno_sc(int f);
static char t1_getctxno_mag(int f);
static INLINE int t1_getctxno_mag(int f);
static char t1_getspb(int f);
static short t1_getnmsedec_sig(int x, int bitpos);
static short t1_getnmsedec_ref(int x, int bitpos);
@@ -232,8 +232,10 @@ static char t1_getctxno_sc(int f) {
return lut_ctxno_sc[(f & (T1_SIG_PRIM | T1_SGN)) >> 4];
}
static char t1_getctxno_mag(int f) {
return lut_ctxno_mag[(f & T1_SIG_OTH) | (((f & T1_REFINE) != 0) << 11)];
static int t1_getctxno_mag(int f) {
int tmp1 = (f & T1_SIG_OTH) ? T1_CTXNO_MAG + 1 : T1_CTXNO_MAG;
int tmp2 = (f & T1_REFINE) ? T1_CTXNO_MAG + 2 : tmp1;
return (tmp2);
}
static char t1_getspb(int f) {