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| author | Michael Niedermayer <michaelni@gmx.at> | 2011-11-11 23:58:08 +0100 |
|---|---|---|
| committer | Michael Niedermayer <michaelni@gmx.at> | 2011-11-12 00:04:16 +0100 |
| commit | ddeb194b14029b8e4c3138ea92fd1c539f4ea26a (patch) | |
| tree | c793cfa909247719dff745aa29344062c45f067d | |
| parent | dece0172806f2658d126fc5b04457057d609f2de (diff) | |
| download | ffmpeg-ddeb194b14029b8e4c3138ea92fd1c539f4ea26a.tar.gz | |
mandelbrot: add a end_scale and pts so we can zoom in.
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
| -rw-r--r-- | libavfilter/vsrc_mandelbrot.c | 13 |
1 files changed, 10 insertions, 3 deletions
diff --git a/libavfilter/vsrc_mandelbrot.c b/libavfilter/vsrc_mandelbrot.c index 1fb518c562..16a2e10759 100644 --- a/libavfilter/vsrc_mandelbrot.c +++ b/libavfilter/vsrc_mandelbrot.c @@ -43,6 +43,8 @@ typedef struct { double start_x; double start_y; double start_scale; + double end_scale; + double end_pts; double bailout; enum Outer outer; } MBContext; @@ -57,8 +59,10 @@ static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque) mb->maxiter=256; mb->start_x=0; - mb->start_y=0; + mb->start_y=1; mb->start_scale=3.0; + mb->end_scale=0.3; + mb->end_pts=200; mb->bailout=100; mb->outer= NORMALIZED_ITERATION_COUNT; if (args) @@ -69,6 +73,7 @@ static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque) return AVERROR(EINVAL); } mb->start_scale /=mb->h; + mb->end_scale /=mb->h; if (av_parse_video_rate(&frame_rate_q, frame_rate) < 0 || frame_rate_q.den <= 0 || frame_rate_q.num <= 0) { @@ -119,10 +124,12 @@ static void draw_mandelbrot(AVFilterContext *ctx, uint32_t *color, int linesize, MBContext *mb = ctx->priv; int x,y,i; + double scale= mb->start_scale*pow(mb->end_scale/mb->start_scale, pts/mb->end_pts); + for(y=0; y<mb->h; y++){ for(x=0; x<mb->w; x++){ - const double cr=mb->start_x+mb->start_scale*(x-mb->w/2); - const double ci=mb->start_y+mb->start_scale*(y-mb->h/2); + const double cr=mb->start_x+scale*(x-mb->w/2); + const double ci=mb->start_y+scale*(y-mb->h/2); double zr=cr; double zi=ci; uint32_t c=0; |