static void
fz_dash_lineto(struct sctx *s, fz_point b, int dash_cap, int from_bezier)
{
float dx, dy;
float total, used, ratio;
fz_point a;
fz_point m;
a = s->cur;
dx = b.x - a.x;
dy = b.y - a.y;
total = sqrtf(dx * dx + dy * dy);
used = 0;
while (total - used > s->dash_list[s->offset] - s->phase)
{
used += s->dash_list[s->offset] - s->phase;
ratio = used / total;
m.x = a.x + ratio * dx;
m.y = a.y + ratio * dy;
if (s->toggle)
{
fz_stroke_lineto(s, m, from_bezier);
}
else
{
fz_stroke_flush(s, s->cap, dash_cap);
s->cap = dash_cap;
fz_stroke_moveto(s, m);
}
s->toggle = !s->toggle;
s->phase = 0;
s->offset ++;
if (s->offset == s->dash_len)
s->offset = 0;
}
s->phase += total - used;
s->cur = b;
if (s->toggle)
{
fz_stroke_lineto(s, b, from_bezier);
}
}
static void
fz_stroke_closepath(struct sctx *s)
{
if (s->sn == 2)
{
/* SumatraPDF: prevent rendering artifacts from line joins */
float dx = s->beg[0].x - s->seg[1].x, dy = s->beg[0].y - s->seg[1].y;
fz_stroke_lineto(s, s->beg[0], 0);
if (s->seg[1].x == s->beg[0].x && s->seg[1].y == s->beg[0].y)
fz_add_line_join(s, s->seg[0], s->beg[0], s->beg[1], 0);
else if (dx * dx + dy * dy < FLT_EPSILON)
fz_stroke_flush(s, FZ_LINECAP_BUTT, FZ_LINECAP_BUTT);
else
fz_add_line_join(s, s->seg[1], s->beg[0], s->beg[1], 0);
}
else if (s->dot)
{
fz_add_line_dot(s, s->beg[0]);
}
s->seg[0] = s->beg[0];
s->bn = 1;
s->sn = 1;
s->dot = 0;
s->from_bezier = 0;
}
static void
fz_stroke_bezier(struct sctx *s,
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 = fz_abs(xa - xb);
dmax = fz_max(dmax, fz_abs(ya - yb));
dmax = fz_max(dmax, fz_abs(xd - xc));
dmax = fz_max(dmax, fz_abs(yd - yc));
if (dmax < s->flatness || depth >= MAX_DEPTH)
{
fz_point p;
p.x = xd;
p.y = yd;
fz_stroke_lineto(s, p, 1);
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;
fz_stroke_bezier(s, xa, ya, xab, yab, xabc, yabc, xabcd, yabcd, depth + 1);
fz_stroke_bezier(s, xabcd, yabcd, xbcd, ybcd, xcd, ycd, xd, yd, depth + 1);
}
static void
fz_stroke_closepath(struct sctx *s)
{
if (s->sn == 2)
{
fz_stroke_lineto(s, s->beg[0]);
if (s->seg[1].x == s->beg[0].x && s->seg[1].y == s->beg[0].y)
fz_add_line_join(s, s->seg[0], s->beg[0], s->beg[1]);
else
fz_add_line_join(s, s->seg[1], s->beg[0], s->beg[1]);
}
else if (s->dot)
{
fz_add_line_dot(s, s->beg[0]);
}
s->seg[0] = s->beg[0];
s->bn = 1;
s->sn = 1;
s->dot = 0;
}
void
fz_flatten_stroke_path(fz_gel *gel, fz_path *path, const fz_stroke_state *stroke, const fz_matrix *ctm, float flatness, float linewidth)
{
struct sctx s;
fz_point p0, p1, p2, p3;
int i;
s.gel = gel;
s.ctm = ctm;
s.flatness = flatness;
s.linejoin = stroke->linejoin;
s.linewidth = linewidth * 0.5f; /* hairlines use a different value from the path value */
s.miterlimit = stroke->miterlimit;
s.sn = 0;
s.bn = 0;
s.dot = 0;
s.dash_list = NULL;
s.dash_phase = 0;
s.dash_len = 0;
s.toggle = 0;
s.offset = 0;
s.phase = 0;
s.cap = stroke->start_cap;
i = 0;
if (path->len > 0 && path->items[0].k != FZ_MOVETO)
return;
p0.x = p0.y = 0;
while (i < path->len)
{
switch (path->items[i++].k)
{
case FZ_MOVETO:
p1.x = path->items[i++].v;
p1.y = path->items[i++].v;
fz_stroke_flush(&s, stroke->start_cap, stroke->end_cap);
fz_stroke_moveto(&s, p1);
p0 = p1;
break;
case FZ_LINETO:
p1.x = path->items[i++].v;
p1.y = path->items[i++].v;
fz_stroke_lineto(&s, p1, 0);
p0 = p1;
break;
case FZ_CURVETO:
p1.x = path->items[i++].v;
p1.y = path->items[i++].v;
p2.x = path->items[i++].v;
p2.y = path->items[i++].v;
p3.x = path->items[i++].v;
p3.y = path->items[i++].v;
fz_stroke_bezier(&s, p0.x, p0.y, p1.x, p1.y, p2.x, p2.y, p3.x, p3.y, 0);
p0 = p3;
break;
case FZ_CLOSE_PATH:
fz_stroke_closepath(&s);
break;
}
}
fz_stroke_flush(&s, stroke->start_cap, stroke->end_cap);
}
static void
fz_dash_lineto(struct sctx *s, fz_point b, int dash_cap, int from_bezier)
{
float dx, dy, d;
float total, used, ratio, tail;
fz_point a;
fz_point m;
fz_point old_b;
int n;
a = s->cur;
dx = b.x - a.x;
dy = b.y - a.y;
used = 0;
tail = 0;
total = sqrtf(dx * dx + dy * dy);
/* If a is off screen, bring it onto the screen. First
* horizontally... */
if ((d = s->rect.x0 - a.x) > 0)
{
if (b.x < s->rect.x0)
{
/* Entirely off screen */
tail = total;
old_b = b;
goto adjust_for_tail;
}
a.x = s->rect.x0; /* d > 0, dx > 0 */
goto a_moved_horizontally;
}
else if (d < 0 && (d = (s->rect.x1 - a.x)) < 0)
{
if (b.x > s->rect.x1)
{
/* Entirely off screen */
tail = total;
old_b = b;
goto adjust_for_tail;
}
a.x = s->rect.x1; /* d < 0, dx < 0 */
a_moved_horizontally: /* d and dx have the same sign */
a.y += dy * d/dx;
used = total * d/dx;
total -= used;
dx = b.x - a.x;
dy = b.y - a.y;
}
/* Then vertically... */
if ((d = s->rect.y0 - a.y) > 0)
{
if (b.y < s->rect.y0)
{
/* Entirely off screen */
tail = total;
old_b = b;
goto adjust_for_tail;
}
a.y = s->rect.y0; /* d > 0, dy > 0 */
goto a_moved_vertically;
}
else if (d < 0 && (d = (s->rect.y1 - a.y)) < 0)
{
if (b.y > s->rect.y1)
{
/* Entirely off screen */
tail = total;
old_b = b;
goto adjust_for_tail;
}
a.y = s->rect.y1; /* d < 0, dy < 0 */
a_moved_vertically: /* d and dy have the same sign */
a.x += dx * d/dy;
d = total * d/dy;
total -= d;
used += d;
dx = b.x - a.x;
dy = b.y - a.y;
}
if (used != 0.0f)
{
/* Update the position in the dash array */
if (s->toggle)
{
fz_stroke_lineto(s, a, from_bezier);
}
else
{
fz_stroke_flush(s, s->cap, dash_cap);
s->cap = dash_cap;
fz_stroke_moveto(s, a);
}
used += s->phase;
n = used/s->dash_total;
used -= n*s->dash_total;
if (n & s->dash_len & 1)
s->toggle = !s->toggle;
while (used >= s->dash_list[s->offset])
{
used -= s->dash_list[s->offset];
s->offset++;
if (s->offset == s->dash_len)
s->offset = 0;
s->toggle = !s->toggle;
}
if (s->toggle)
{
fz_stroke_lineto(s, a, from_bezier);
}
else
{
fz_stroke_flush(s, s->cap, dash_cap);
s->cap = dash_cap;
fz_stroke_moveto(s, a);
}
s->phase = used;
used = 0;
}
/* Now if b.x is off screen, bring it back */
if ((d = b.x - s->rect.x0) < 0)
{
old_b = b;
b.x = s->rect.x0; /* d < 0, dx < 0 */
goto b_moved_horizontally;
}
else if (d > 0 && (d = (b.x - s->rect.x1)) > 0)
{
old_b = b;
b.x = s->rect.x1; /* d > 0, dx > 0 */
b_moved_horizontally: /* d and dx have the same sign */
b.y -= dy * d/dx;
tail = total * d/dx;
total -= tail;
dx = b.x - a.x;
dy = b.y - a.y;
}
/* Then vertically... */
if ((d = b.y - s->rect.y0) < 0)
{
old_b = b;
b.y = s->rect.y0; /* d < 0, dy < 0 */
goto b_moved_vertically;
}
else if (d > 0 && (d = (b.y - s->rect.y1)) > 0)
{
float t;
old_b = b;
b.y = s->rect.y1; /* d > 0, dy > 0 */
b_moved_vertically: /* d and dy have the same sign */
b.x -= dx * d/dy;
t = total * d/dy;
tail += t;
total -= t;
dx = b.x - a.x;
dy = b.y - a.y;
}
while (total - used > s->dash_list[s->offset] - s->phase)
{
used += s->dash_list[s->offset] - s->phase;
ratio = used / total;
m.x = a.x + ratio * dx;
m.y = a.y + ratio * dy;
if (s->toggle)
{
fz_stroke_lineto(s, m, from_bezier);
}
else
{
fz_stroke_flush(s, s->cap, dash_cap);
s->cap = dash_cap;
fz_stroke_moveto(s, m);
}
s->toggle = !s->toggle;
s->phase = 0;
s->offset ++;
if (s->offset == s->dash_len)
s->offset = 0;
}
s->phase += total - used;
if (tail == 0.0f)
{
s->cur = b;
if (s->toggle)
{
fz_stroke_lineto(s, b, from_bezier);
}
}
else
{
adjust_for_tail:
s->cur = old_b;
/* Update the position in the dash array */
if (s->toggle)
{
fz_stroke_lineto(s, old_b, from_bezier);
}
else
{
fz_stroke_flush(s, s->cap, dash_cap);
s->cap = dash_cap;
fz_stroke_moveto(s, old_b);
}
tail += s->phase;
n = tail/s->dash_total;
tail -= n*s->dash_total;
if (n & s->dash_len & 1)
s->toggle = !s->toggle;
while (tail > s->dash_list[s->offset])
{
tail -= s->dash_list[s->offset];
s->offset++;
if (s->offset == s->dash_len)
s->offset = 0;
s->toggle = !s->toggle;
}
if (s->toggle)
{
fz_stroke_lineto(s, old_b, from_bezier);
}
else
{
fz_stroke_flush(s, s->cap, dash_cap);
s->cap = dash_cap;
fz_stroke_moveto(s, old_b);
}
s->phase = tail;
}
}