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| author | Michael Niedermayer <michaelni@gmx.at> | 2011-11-11 23:21:42 +0100 |
|---|---|---|
| committer | Michael Niedermayer <michaelni@gmx.at> | 2011-11-11 23:21:42 +0100 |
| commit | 75e309160bae8071575aae0d7eb81a58a7322e45 (patch) | |
| tree | 600df464b489379af476827e75dfac5d5605d2b2 /libavfilter/vsrc_mandelbrot.c | |
| parent | 847e61de4aa26b4decd629e2f113e8f60b7d3a07 (diff) | |
| download | ffmpeg-75e309160bae8071575aae0d7eb81a58a7322e45.tar.gz | |
mandelbrot: make bailout a variable
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
Diffstat (limited to 'libavfilter/vsrc_mandelbrot.c')
| -rw-r--r-- | libavfilter/vsrc_mandelbrot.c | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/libavfilter/vsrc_mandelbrot.c b/libavfilter/vsrc_mandelbrot.c index bf4c5c5688..6987501888 100644 --- a/libavfilter/vsrc_mandelbrot.c +++ b/libavfilter/vsrc_mandelbrot.c @@ -38,6 +38,7 @@ typedef struct { double start_x; double start_y; double start_scale; + double bailout; } MBContext; static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque) @@ -52,6 +53,7 @@ static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque) mb->start_x=-2.0; mb->start_y=-1.5; mb->start_scale=3.0; + mb->bailout=100; if (args) sscanf(args, "%127[^:]:%127[^:]:%d,%lf:%lf:%lf", frame_size, frame_rate, &mb->maxiter, &mb->start_x, &mb->start_y, &mb->start_scale); @@ -116,13 +118,12 @@ static void draw_mandelbrot(AVFilterContext *ctx, uint32_t *color, int linesize, double ci=mb->start_y+mb->start_scale*y; double zr=cr; double zi=ci; - const double B=100; uint32_t c=0; for(i=0; i<256; i++){ double t; - if(zr*zr + zi*zi > B){ - zr= i + (log(log(B)) - log(log(sqrt(zr*zr + zi*zi))))/log(2); + if(zr*zr + zi*zi > mb->bailout){ + zr= i + (log(log(mb->bailout)) - log(log(sqrt(zr*zr + zi*zi))))/log(2); break; c= lrintf((sin(zr)+1)*127) + lrintf((sin(zr/1.234)+1)*127)*256*256 + lrintf((sin(zr/100)+1)*127)*256; break; } |