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mandelbrot: support different outer coloring methods.

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Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2011-11-11 23:22:04 +01:00
parent 75e309160b
commit 4ccd898af2
1 changed files with 11 additions and 1 deletions
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12
libavfilter/vsrc_mandelbrot.c
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@ -30,6 +30,11 @@
#include "libavutil/imgutils.h"
#include "libavutil/parseutils.h"
enum Outer{
ITERATION_COUNT,
NORMALIZED_ITERATION_COUNT,
};
typedef struct {
int w, h;
AVRational time_base;
@ -39,6 +44,7 @@ typedef struct {
double start_y;
double start_scale;
double bailout;
enum Outer outer;
} MBContext;
static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque)
@ -54,6 +60,7 @@ static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque)
mb->start_y=-1.5;
mb->start_scale=3.0;
mb->bailout=100;
mb->outer= NORMALIZED_ITERATION_COUNT;
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);
@ -123,7 +130,10 @@ static void draw_mandelbrot(AVFilterContext *ctx, uint32_t *color, int linesize,
for(i=0; i<256; i++){
double t;
if(zr*zr + zi*zi > mb->bailout){
zr= i + (log(log(mb->bailout)) - log(log(sqrt(zr*zr + zi*zi))))/log(2); break;
switch(mb->outer){
case ITERATION_COUNT: zr= i; break;
case NORMALIZED_ITERATION_COUNT: 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;
}