From 6c5dd858b4c8aa4cb009802dd86d0ea5dc03eabf Mon Sep 17 00:00:00 2001
From: Michael Niedermayer <michaelni@gmx.at>
Date: Sat, 12 Nov 2011 16:33:56 +0100
Subject: [PATCH] mandelbrot: Only use cycle detection if previous pixel was an
interior pixel
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
---
libavfilter/vsrc_mandelbrot.c | 13 ++++++++-----
1 file changed, 8 insertions(+), 5 deletions(-)
diff --git a/libavfilter/vsrc_mandelbrot.c b/libavfilter/vsrc_mandelbrot.c
index 67b289340db..2f8134f787f 100644
--- a/libavfilter/vsrc_mandelbrot.c
+++ b/libavfilter/vsrc_mandelbrot.c
@@ -159,7 +159,7 @@ static void draw_mandelbrot(AVFilterContext *ctx, uint32_t *color, int linesize,
MBContext *mb = ctx->priv;
int x,y,i, in_cidx=0, next_cidx=0, tmp_cidx;
double scale= mb->start_scale*pow(mb->end_scale/mb->start_scale, pts/mb->end_pts);
-
+ int use_zyklus=0;
fill_from_cache(ctx, NULL, &in_cidx, NULL, mb->start_y+scale*(-mb->h/2-0.5), scale);
for(y=0; y<mb->h; y++){
const double ci=mb->start_y+scale*(y-mb->h/2);
@@ -190,11 +190,14 @@ 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;
+ if(use_zyklus){
+ 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;
+ }
}
+ use_zyklus = !c;
c |= 0xFF000000;
color[x + y*linesize]= c;
if(next_cidx < mb->cache_allocated){
--
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