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mandelbrot: add a end_scale and pts so we can zoom in.

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Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2011-11-11 23:58:08 +01:00
parent dece017280
commit ddeb194b14
1 changed files with 10 additions and 3 deletions
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13
libavfilter/vsrc_mandelbrot.c
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@ -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;