diff options
| author | Michael Niedermayer <michaelni@gmx.at> | 2011-11-19 14:15:56 +0100 |
|---|---|---|
| committer | Michael Niedermayer <michaelni@gmx.at> | 2011-11-19 14:15:56 +0100 |
| commit | 649d3932db83763a49073a185189d338adbb3b9d (patch) | |
| tree | e6ea4cc764e06a2836932f4b37783c9eaa4dccda /libavfilter/vsrc_mandelbrot.c | |
| parent | fe2efc5264940d0561b50bcce65dc8a24f352d9e (diff) | |
vsrc_mandelbrot: check bailout only once every 8 iterations, this is around 10% faster.
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
Diffstat (limited to 'libavfilter/vsrc_mandelbrot.c')
| -rw-r--r-- | libavfilter/vsrc_mandelbrot.c | 25 |
1 files changed, 24 insertions, 1 deletions
diff --git a/libavfilter/vsrc_mandelbrot.c b/libavfilter/vsrc_mandelbrot.c index 5701094cbd..9aea384b55 100644 --- a/libavfilter/vsrc_mandelbrot.c +++ b/libavfilter/vsrc_mandelbrot.c @@ -247,7 +247,30 @@ static void draw_mandelbrot(AVFilterContext *ctx, uint32_t *color, int linesize, } - for(i=0; i<mb->maxiter; i++){ + for(i=0; i<mb->maxiter-8; i++){ + double t; + Z_Z2_C_ZYKLUS(t, zi, zr, zi, 0) + i++; + Z_Z2_C_ZYKLUS(zr, zi, t, zi, 1) + i++; + Z_Z2_C_ZYKLUS(t, zi, zr, zi, 0) + i++; + Z_Z2_C_ZYKLUS(zr, zi, t, zi, 1) + i++; + Z_Z2_C_ZYKLUS(t, zi, zr, zi, 0) + i++; + Z_Z2_C_ZYKLUS(zr, zi, t, zi, 1) + i++; + Z_Z2_C_ZYKLUS(t, zi, zr, zi, 0) + i++; + Z_Z2_C_ZYKLUS(zr, zi, t, zi, 1) + if(zr*zr + zi*zi > mb->bailout) + break; + } + i-= FFMIN(7, i); + zr= mb->zyklus[i][0]; + zi= mb->zyklus[i][1]; + for(; i<mb->maxiter; i++){ double t; if(zr*zr + zi*zi > mb->bailout){ switch(mb->outer){ |