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update mandel_dd_aa

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josch 2013-06-28 15:55:46 +02:00
parent bcf75e0e2e
commit 0315cc9a9b
1 changed files with 27 additions and 21 deletions
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48
mandel_dd_aa.c
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@ -7,10 +7,20 @@
#include "doubledouble.h"
DoubleDouble x2, y2, x0d, y1d;
double bailout = 4; // the distance must not be greater than 2 (4 = 2*2)
double Q1LOG2 = 1.44269504088896340735992468100189213742664595415299;
double LOG2 = 0.69314718055994530941723212145817656807550013436026;
double bailout = 128; // with a smaller value there are lines on magn=1
double eps = 1e-17;
double logLogBailout;
void calculate_pixel(double x, double y, unsigned long *lastit, double *zxd, double *zyd, bool *inside) {
inline int getcoloridx(unsigned long lastit, double zxd, double zyd) {
double r, c;
r = sqrt(zxd*zxd + zyd*zyd);
c = lastit - 1.28 + (logLogBailout - log(log(r))) * Q1LOG2;
return fmod((log(c/64+1)/LOG2+0.45), 1)*GRADIENTLENGTH + 0.5;
}
inline void calculate_pixel(double x, double y, unsigned long *lastit, double *zxd, double *zyd, bool *inside) {
DoubleDouble px, py, zx, zy, xx, yy;
//px = x*x0d + x2;
px = dd_mul_d(x0d, x);
@ -79,8 +89,6 @@ int main(int argc, char **argv) {
return 1;
}
DoubleDouble temp1;
double Q1LOG2 = 1.44269504088896340735992468100189213742664595415299;
double LOG2 = 0.69314718055994530941723212145817656807550013436026;
unsigned int width = atoi(argv[1]);
unsigned int height = atoi(argv[2]);
unsigned char* tmpimage = malloc(width*height*3);
@ -89,11 +97,11 @@ int main(int argc, char **argv) {
DoubleDouble centerx, centery;
centerx = dd_new(-0.7436438870371587, -3.628952515063387E-17);
centery = dd_new(0.13182590420531198, -1.2892807754956678E-17);
double logLogBailout = log(log(bailout));
logLogBailout = log(log(bailout));
DoubleDouble magn = dd_new(strtod(argv[5], NULL), 0);
// maxiter = width * sqrt(magn);
/*// maxiter = width * sqrt(magn);
temp1 = dd_sqrt(magn);
unsigned long maxiter = width * dd_get_ui(temp1);
unsigned long maxiter = width * dd_get_ui(temp1);*/
// x0d = 4 / magn / width;
x0d = dd_ui_div(4, magn);
x0d = dd_div_ui(x0d, width);
@ -116,7 +124,7 @@ int main(int argc, char **argv) {
bool inside;
for (y = 0; y < height; y++) {
for (x = 0; x < width; x++) {
fprintf(stderr, "\r%f %%", (float)imgidx/(width*height*3)*100);
fprintf(stderr, "\rR: %f %%", (float)imgidx/(width*height*3)*100);
calculate_pixel(x, y, &lastit, &zxd, &zyd, &inside);
if (inside) {
@ -124,9 +132,7 @@ int main(int argc, char **argv) {
tmpimage[imgidx++] = 0;
tmpimage[imgidx++] = 0;
} else {
double r = sqrt(zxd*zxd + zyd*zyd);
double c = lastit - 1.28 + (logLogBailout - log(log(r))) * Q1LOG2;
idx = fmod((log(c/64+1)/LOG2+0.45), 1)*GRADIENTLENGTH + 0.5;
idx = getcoloridx(lastit, zxd, zyd);
tmpimage[imgidx++] = colors[idx][0];
tmpimage[imgidx++] = colors[idx][1];
tmpimage[imgidx++] = colors[idx][2];
@ -141,14 +147,16 @@ int main(int argc, char **argv) {
int aaarea = aafactor * aafactor;
double aafactorinv = 1.0/aafactor;
int xi, yi;
unsigned int val1, val2, val3;
double dx, dy;
for (y = 0; y < height; y++) {
for (x = 0; x < width; x++) {
fprintf(stderr, "\r%f %%", (float)imgidx/(width*height*3)*100);
unsigned int val1 = tmpimage[imgidx++];
unsigned int val2 = tmpimage[imgidx++];
unsigned int val3 = tmpimage[imgidx++];
fprintf(stderr, "\rAA: %f %%", (float)imgidx/(width*height*3)*100);
val1 = tmpimage[imgidx++];
val2 = tmpimage[imgidx++];
val3 = tmpimage[imgidx++];
// if pixel is neither at the border nor are its four neighbors
// different, copy value and continue
// different, copy value and continue without antialiasing it
if (x != 0 && y != 0 && x != width -1 && y != height -1
&& tmpimage[(y+1)*width*3+x*3+0] == val1
&& tmpimage[(y+1)*width*3+x*3+1] == val2
@ -170,15 +178,13 @@ int main(int argc, char **argv) {
// otherwise do antialiasing
for (xi = -aareach; xi <= aareach; xi++) {
double dx = xi*aafactorinv;
dx = xi*aafactorinv;
for (yi = -aareach; yi <= aareach; yi++) {
double dy = yi*aafactorinv;
dy = yi*aafactorinv;
if ((xi | yi) != 0) {
calculate_pixel(x+dx, y+dy, &lastit, &zxd, &zyd, &inside);
if (!inside) {
double r = sqrt(zxd*zxd + zyd*zyd);
double c = lastit - 1.28 + (logLogBailout - log(log(r))) * Q1LOG2;
idx = fmod((log(c/64+1)/LOG2+0.45), 1)*GRADIENTLENGTH + 0.5;
idx = getcoloridx(lastit, zxd, zyd);
val1 += colors[idx][0];
val2 += colors[idx][1];
val3 += colors[idx][2];