static void drawlineroundempty(uint8_t *data, int width, int height, double sx, double sy, double span, double radius, double subwidth)
{
int x, y;
double cx = sx - 0.5, cy = sy - 0.5, sw = (double)subwidth / 2.0;
for(y = 0; y != height; y++) {
for(x = 0; x != width; x++) {
double dx = (double)x - cx, dy = (double)y - cy;
double d = (SQRT2 / 2.0) * fabs(dx + dy) - radius;
d = fmax(fabs(dx) + fabs(dy) - (SQRT2 / 2.0) * (double)span - radius, d);
double ddx = (double)x - cx - span * SQRT2 , ddy = (double)y - cy + span * SQRT2;
double d2 = sqrt(ddx * ddx + ddy * ddy) - sw;
d = fmin(d, d2);
ddx = (double)x - cx + span * SQRT2; ddy = (double)y - cy - span * SQRT2;
d2 = sqrt(ddx * ddx + ddy * ddy) - sw;
d = fmin(d, d2);
*data = pixelmin(d, *data); data++;
}
}
}
static void drawsubcircle(uint8_t *data, int width, int height, double cx, double cy, double subwidth) {
int x, y;
double hw = cx - 0.5, vw = cy - 0.5, sw = subwidth / 2.0;
for(y = 0; y != height; y++) {
for(x = 0; x != width; x++) {
double dx = (x - hw), dy = (y - vw);
double d = sqrt(dx * dx + dy * dy) - sw;
*data = pixelmin(d, *data); data++;
}
}
}
static void svgdraw_line_down_neg(uint8_t *data, int width, int height, double sx, double sy, double span, double radius) {
int x, y;
double cx = sx - 0.5, cy = sy - 0.5;
for(y = 0; y != height; y++) {
for(x = 0; x != width; x++) {
double dx = (double)x - cx, dy = (double)y - cy;
double d = (SQRT2 / 2.0) * fabs(dx - dy) - radius;
d = fmax(fabs(dx) + fabs(dy) - (SQRT2 / 2.0) * (double)span - radius, d);
*data = pixelmin(d, *data); data++;
}
}
}
