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changed flam3_colorhist to take a random context as an argument rather than creating a new one each time. Also optimized the loop to only generate the precalc flags once and create the xform distrib array once.

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git-svn-id: https://flam3.googlecode.com/svn/trunk@6 77852712-ef1d-11de-8684-7d64432d61a3
This commit is contained in:
Erik Reckase 2010-04-24 03:41:22 +00:00 committed by Scott Draves
parent 9e40cff938
commit be7f6fd741
2 changed files with 12 additions and 18 deletions
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28
src/flam3.c
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@ -343,41 +343,34 @@ int flam3_xform_preview(flam3_genome *cp, int xi, double range, int numvals, int
return(0);
}
int flam3_colorhist(flam3_genome *cp, int num_batches, double *hist) {
int flam3_colorhist(flam3_genome *cp, int num_batches, randctx *rc, double *hist) {
int lp,plp;
int mycolor;
long int default_isaac_seed = (long int)time(0);
randctx rc;
unsigned short *xform_distrib;
int sbs = 10000;
double sub_batch[4*10000];
/* Set up the isaac rng */
for (lp = 0; lp < RANDSIZ; lp++)
rc.randrsl[lp] = default_isaac_seed;
irandinit(&rc,1);
memset(hist,0,256*sizeof(double));
// get into the attractor
if (prepare_precalc_flags(cp))
return(1);
xform_distrib = flam3_create_xform_distrib(cp);
for (lp=0;lp<num_batches;lp++) {
sub_batch[0] = flam3_random_isaac_11(&rc);
sub_batch[1] = flam3_random_isaac_11(&rc);
sub_batch[0] = flam3_random_isaac_11(rc);
sub_batch[1] = flam3_random_isaac_11(rc);
sub_batch[2] = 0;
sub_batch[3] = 0;
// get into the attractor
if (prepare_precalc_flags(cp))
return(1);
xform_distrib = flam3_create_xform_distrib(cp);
if (xform_distrib==NULL)
return(1);
flam3_iterate(cp, sbs, 20, sub_batch, xform_distrib, &rc);
free(xform_distrib);
flam3_iterate(cp, sbs, 20, sub_batch, xform_distrib, rc);
// histogram the colors in the sub_batch array
for (plp=0;plp<4*sbs;plp+=4) {
@ -389,6 +382,7 @@ int flam3_colorhist(flam3_genome *cp, int num_batches, double *hist) {
}
}
free(xform_distrib);
for (plp=0;plp<256;plp++)
hist[plp] /= (float)(num_batches*sbs);

2
src/flam3.h
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@ -570,7 +570,7 @@ flam3_genome *flam3_parse_from_file(FILE *f, char *fn, int default_flag, int *nc
void flam3_add_symmetry(flam3_genome *g, int sym);
void flam3_improve_colors(flam3_genome *g, int ntries, int change_palette, int color_resolution);
EXPORT int flam3_colorhist(flam3_genome *cp, int num_batches, double *hist);
EXPORT int flam3_colorhist(flam3_genome *cp, int num_batches, randctx *rc, double *hist);
EXPORT int flam3_estimate_bounding_box(flam3_genome *g, double eps, int nsamples,
double *bmin, double *bmax, randctx *rc);
void flam3_rotate(flam3_genome *g, double angle, int interp_type); /* angle in degrees */