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#include "fitz.h"
#define MAXDEPTH 8
static void
line(fz_gel *gel, fz_matrix *ctm, float x0, float y0, float x1, float y1)
{
float tx0 = ctm->a * x0 + ctm->c * y0 + ctm->e;
float ty0 = ctm->b * x0 + ctm->d * y0 + ctm->f;
float tx1 = ctm->a * x1 + ctm->c * y1 + ctm->e;
float ty1 = ctm->b * x1 + ctm->d * y1 + ctm->f;
fz_insertgel(gel, tx0, ty0, tx1, ty1);
}
static void
bezier(fz_gel *gel, fz_matrix *ctm, float flatness,
float xa, float ya,
float xb, float yb,
float xc, float yc,
float xd, float yd, int depth)
{
float dmax;
float xab, yab;
float xbc, ybc;
float xcd, ycd;
float xabc, yabc;
float xbcd, ybcd;
float xabcd, yabcd;
/* termination check */
dmax = ABS(xa - xb);
dmax = MAX(dmax, ABS(ya - yb));
dmax = MAX(dmax, ABS(xd - xc));
dmax = MAX(dmax, ABS(yd - yc));
if (dmax < flatness || depth >= MAXDEPTH)
{
line(gel, ctm, xa, ya, xd, yd);
return;
}
xab = xa + xb;
yab = ya + yb;
xbc = xb + xc;
ybc = yb + yc;
xcd = xc + xd;
ycd = yc + yd;
xabc = xab + xbc;
yabc = yab + ybc;
xbcd = xbc + xcd;
ybcd = ybc + ycd;
xabcd = xabc + xbcd;
yabcd = yabc + ybcd;
xab *= 0.5f; yab *= 0.5f;
xbc *= 0.5f; ybc *= 0.5f;
xcd *= 0.5f; ycd *= 0.5f;
xabc *= 0.25f; yabc *= 0.25f;
xbcd *= 0.25f; ybcd *= 0.25f;
xabcd *= 0.125f; yabcd *= 0.125f;
bezier(gel, ctm, flatness, xa, ya, xab, yab, xabc, yabc, xabcd, yabcd, depth + 1);
bezier(gel, ctm, flatness, xabcd, yabcd, xbcd, ybcd, xcd, ycd, xd, yd, depth + 1);
}
void
fz_fillpath(fz_gel *gel, fz_path *path, fz_matrix ctm, float flatness)
{
float x1, y1, x2, y2, x3, y3;
float cx = 0;
float cy = 0;
float bx = 0;
float by = 0;
int i = 0;
while (i < path->len)
{
switch (path->els[i++].k)
{
case FZ_MOVETO:
/* implicit closepath before moveto */
if (i && (cx != bx || cy != by))
line(gel, &ctm, cx, cy, bx, by);
x1 = path->els[i++].v;
y1 = path->els[i++].v;
cx = bx = x1;
cy = by = y1;
break;
case FZ_LINETO:
x1 = path->els[i++].v;
y1 = path->els[i++].v;
line(gel, &ctm, cx, cy, x1, y1);
cx = x1;
cy = y1;
break;
case FZ_CURVETO:
x1 = path->els[i++].v;
y1 = path->els[i++].v;
x2 = path->els[i++].v;
y2 = path->els[i++].v;
x3 = path->els[i++].v;
y3 = path->els[i++].v;
bezier(gel, &ctm, flatness, cx, cy, x1, y1, x2, y2, x3, y3, 0);
cx = x3;
cy = y3;
break;
case FZ_CLOSEPATH:
line(gel, &ctm, cx, cy, bx, by);
cx = bx;
cy = by;
break;
}
}
if (i && (cx != bx || cy != by))
line(gel, &ctm, cx, cy, bx, by);
}
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