[FFmpeg-cvslog] mandelbrot: allow visualizing the period of converged points.
Michael Niedermayer
git at videolan.org
Sun Nov 13 19:33:49 CET 2011
ffmpeg | branch: master | Michael Niedermayer <michaelni at gmx.at> | Sun Nov 13 19:28:24 2011 +0100| [08dadd331f171800424c862acc1ed86180d41a4c] | committer: Michael Niedermayer
mandelbrot: allow visualizing the period of converged points.
Signed-off-by: Michael Niedermayer <michaelni at gmx.at>
> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=08dadd331f171800424c862acc1ed86180d41a4c
---
libavfilter/vsrc_mandelbrot.c | 13 ++++++++++++-
1 files changed, 12 insertions(+), 1 deletions(-)
diff --git a/libavfilter/vsrc_mandelbrot.c b/libavfilter/vsrc_mandelbrot.c
index 59a0345..cab372d 100644
--- a/libavfilter/vsrc_mandelbrot.c
+++ b/libavfilter/vsrc_mandelbrot.c
@@ -39,6 +39,7 @@ enum Outer{
enum Inner{
BLACK,
+ PERIOD,
};
typedef struct Point {
@@ -185,7 +186,7 @@ static void draw_mandelbrot(AVFilterContext *ctx, uint32_t *color, int linesize,
if(color[x + y*linesize] & 0xFF000000)
continue;
- use_zyklus= (x==0 || color[x-1 + y*linesize] == 0xFF000000);
+ use_zyklus= (x==0 || mb->inner!=BLACK ||color[x-1 + y*linesize] == 0xFF000000);
for(i=0; i<mb->maxiter; i++){
double t;
@@ -213,6 +214,16 @@ static void draw_mandelbrot(AVFilterContext *ctx, uint32_t *color, int linesize,
mb->zyklus[i][1]= zi;
}
}
+ if(!c && mb->inner==PERIOD){
+ int j;
+ for(j=i-1; j; j--)
+ if(SQR(mb->zyklus[j][0]-zr) + SQR(mb->zyklus[j][1]-zi) < 0.0000000000000001)
+ break;
+ if(j){
+ c= i-j;
+ c= ((c<<5)&0xE0) + ((c<<16)&0xE000) + ((c<<27)&0xE00000);
+ }
+ }
c |= 0xFF000000;
color[x + y*linesize]= c;
if(next_cidx < mb->cache_allocated){
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