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mandelbrot: detect cycles to speed up interior rendering. 

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2011-11-12 16:33:12 +01:00
parent 3de934c873
commit 50b8f9388a
1 changed files with 7 additions and 0 deletions
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7
libavfilter/vsrc_mandelbrot.c
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@ -56,6 +56,7 @@ typedef struct {
int cache_used;
Point *point_cache;
Point *next_cache;
double (*zyklus)[2];
} MBContext;
static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque)
@ -96,6 +97,7 @@ static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque)
mb->cache_used = 0;
mb->point_cache= av_malloc(sizeof(*mb->point_cache)*mb->cache_allocated);
mb-> next_cache= av_malloc(sizeof(*mb-> next_cache)*mb->cache_allocated);
mb-> zyklus = av_malloc(sizeof(*mb->zyklus) * mb->maxiter);
return 0;
}
@ -107,6 +109,7 @@ static av_cold void uninit(AVFilterContext *ctx)
av_freep(&mb->point_cache);
av_freep(&mb-> next_cache);
av_freep(&mb->zyklus);
}
static int query_formats(AVFilterContext *ctx)
@ -187,6 +190,10 @@ static void draw_mandelbrot(AVFilterContext *ctx, uint32_t *color, int linesize,
t= zr*zr - zi*zi;
zi= 2*zr*zi + ci;
zr= t + cr;
if(i && mb->zyklus[i>>1][0]==zr && mb->zyklus[i>>1][1]==zi)
break;
mb->zyklus[i][0]= zr;
mb->zyklus[i][1]= zi;
}
c |= 0xFF000000;
color[x + y*linesize]= c;