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dpx-pdfdraw.c
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dpx-pdfdraw.c
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/* This is dvipdfmx, an eXtended version of dvipdfm by Mark A. Wicks.
Copyright (C) 2002-2017 by Jin-Hwan Cho and Shunsaku Hirata,
the dvipdfmx project team.
Copyright (C) 1998, 1999 by Mark A. Wicks <[email protected]>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
*/
#include "dpx-pdfdraw.h"
#include <assert.h>
#include <math.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "dpx-dpxutil.h"
#include "dpx-error.h"
#include "dpx-mem.h"
#include "dpx-pdfcolor.h"
#include "dpx-pdfdev.h"
#include "dpx-pdfdoc.h"
#define OUR_EPSILON 2.5e-16
/*
* Numbers are rounding to 0-5 fractional digits
* in output routine.
*/
#define detM(M) ((M).a * (M).d - (M).b * (M).c)
#define detP(M) ((M)->a * (M)->d - (M)->b * (M)->c)
static /* __inline__ */ int
inversematrix (pdf_tmatrix *W, const pdf_tmatrix *M)
{
double det;
det = detP(M);
if (fabs(det) < OUR_EPSILON) {
dpx_warning("Inverting matrix with zero determinant...");
return -1; /* result is undefined. */
}
W->a = (M->d) / det; W->b = -(M->b) / det;
W->c = -(M->c) / det; W->d = (M->a) / det;
W->e = (M->c) * (M->f) - (M->d) * (M->e);
W->f = (M->b) * (M->e) - (M->a) * (M->f);
return 0;
}
/* pdf_coord as vector */
#define vecprd(v,w) ((v).x * (w).x + (v).y * (w).y)
#define vecrot(v,w) ((v).x * (w).y - (v).y * (w).x)
#define dsign(v) (((v) >= 0.0) ? 1.0 : -1.0)
/* acos => [0, pi] */
#define vecang(v,w) ( \
dsign(vecrot((v),(w))) * \
acos(vecprd((v),(w)) / sqrt(vecprd((v),(v)) * vecprd((w),(w)))) \
)
static /* __inline__ */ int
pdf_coord__equal (const pdf_coord *p1, const pdf_coord *p2)
{
if (fabs(p1->x - p2->x) < 1.e-7 &&
fabs(p1->y - p2->y) < 1.e-7)
return 1;
return 0;
}
#define COORD_EQUAL(p,q) pdf_coord__equal((p),(q))
static /* __inline__ */ int
pdf_coord__transform (pdf_coord *p, const pdf_tmatrix *M)
{
double x, y;
x = p->x; y = p->y;
p->x = x * M->a + y * M->c + M->e;
p->y = x * M->b + y * M->d + M->f;
return 0;
}
static /* __inline__ */ int
pdf_coord__dtransform (pdf_coord *p, const pdf_tmatrix *M)
{
double x, y;
x = p->x; y = p->y;
p->x = x * M->a + y * M->c;
p->y = x * M->b + y * M->d;
return 0;
}
static /* __inline__ */ int
pdf_coord__idtransform (pdf_coord *p, const pdf_tmatrix *M)
{
pdf_tmatrix W;
double x, y;
int error;
error = inversematrix(&W, M);
if (error)
return error;
x = p->x; y = p->y;
p->x = x * W.a + y * W.c;
p->y = x * W.b + y * W.d;
return 0;
}
/* Modify M itself */
void
pdf_invertmatrix (pdf_tmatrix *M)
{
pdf_tmatrix W;
double det;
assert(M);
det = detP(M);
if (fabs(det) < OUR_EPSILON) {
dpx_warning("Inverting matrix with zero determinant...");
W.a = 1.0; W.c = 0.0;
W.b = 0.0; W.d = 1.0;
W.e = 0.0; W.f = 0.0;
} else {
W.a = (M->d) / det; W.b = -(M->b) / det;
W.c = -(M->c) / det; W.d = (M->a) / det;
W.e = (M->c) * (M->f) - (M->d) * (M->e);
W.f = (M->b) * (M->e) - (M->a) * (M->f);
W.e /= det; W.f /= det;
}
pdf_copymatrix(M, &W);
return;
}
typedef struct pa_elem_
{
int type;
pdf_coord p[3];
} pa_elem;
/* each subpath delimitted by moveto */
struct pdf_path_
{
unsigned int num_paths;
unsigned int max_paths;
pa_elem *path;
};
static const struct {
char opchr; /* PDF operator char */
int n_pts; /* number of *points* */
const char *strkey;
} petypes[] = {
#define PE_TYPE__INVALID -1
#define PE_TYPE__MOVETO 0
{'m', 1, "moveto" },
#define PE_TYPE__LINETO 1
{'l', 1, "lineto" },
#define PE_TYPE__CURVETO 2
{'c', 3, "curveto" },
/* no PS correspondence for v and y */
#define PE_TYPE__CURVETO_V 3
{'v', 2, "vcurveto"}, /* current point replicated */
#define PE_TYPE__CURVETO_Y 4
{'y', 2, "ycurveto"}, /* last point replicated */
#define PE_TYPE__CLOSEPATH 5
{'h', 0, "closepath"},
#define PE_TYPE__TERMINATE 6
{' ', 0, NULL}
};
#define PE_VALID(p) ((p) && \
(p)->type > PE_TYPE__INVALID && (p)->type < PE_TYPE__TERMINATE)
#define PE_N_PTS(p) (PE_VALID((p)) ? petypes[(p)->type].n_pts : 0)
#define PE_OPCHR(p) (PE_VALID((p)) ? petypes[(p)->type].opchr : ' ')
#define PA_LENGTH(pa) ((pa)->num_paths)
#define GS_FLAG_CURRENTPOINT_SET (1 << 0)
#define FORMAT_BUFF_LEN 1024
static char fmt_buf[FORMAT_BUFF_LEN];
static void
init_a_path (pdf_path *p)
{
assert(p);
p->num_paths = 0;
p->max_paths = 0;
p->path = NULL;
return;
}
static void
pdf_path__clearpath (pdf_path *p)
{
assert(p);
p->num_paths = 0;
return;
}
static int
pdf_path__growpath (pdf_path *p, unsigned int max_pe)
{
if (max_pe < p->max_paths)
return 0;
p->max_paths = MAX(p->max_paths + 8, max_pe);
p->path = RENEW(p->path, p->max_paths, pa_elem);
return 0;
}
static void
clear_a_path (pdf_path *p)
{
assert(p);
p->path = mfree(p->path);
p->num_paths = 0;
p->max_paths = 0;
return;
}
static int
pdf_path__copypath (pdf_path *p1, const pdf_path *p0)
{
pa_elem *pe0, *pe1;
unsigned int i;
pdf_path__growpath(p1, PA_LENGTH(p0));
for (i = 0; i < PA_LENGTH(p0); i++) {
pe1 = &(p1->path[i]);
pe0 = &(p0->path[i]);
/* FIXME */
pe1->type = pe0->type;
pe1->p[0].x = pe0->p[0].x;
pe1->p[0].y = pe0->p[0].y;
pe1->p[1].x = pe0->p[1].x;
pe1->p[1].y = pe0->p[1].y;
pe1->p[2].x = pe0->p[2].x;
pe1->p[2].y = pe0->p[2].y;
}
p1->num_paths = PA_LENGTH(p0);
return 0;
}
/* start new subpath */
static int
pdf_path__moveto (pdf_path *pa,
pdf_coord *cp,
const pdf_coord *p0)
{
pa_elem *pe;
pdf_path__growpath(pa, PA_LENGTH(pa) + 1);
if (PA_LENGTH(pa) > 0) {
pe = &pa->path[pa->num_paths-1];
if (pe->type == PE_TYPE__MOVETO) {
pe->p[0].x = cp->x = p0->x;
pe->p[0].y = cp->y = p0->y;
return 0;
}
}
pe = &pa->path[pa->num_paths++];
pe->type = PE_TYPE__MOVETO;
pe->p[0].x = cp->x = p0->x;
pe->p[0].y = cp->y = p0->y;
return 0;
}
/* Do 'compression' of path while adding new path elements.
* Sequantial moveto command will be replaced with a
* single moveto. If cp is not equal to the last point in pa,
* then moveto is inserted (starting new subpath).
* FIXME:
* 'moveto' must be used to enforce starting new path.
* This affects how 'closepath' is treated.
*/
static pa_elem *
pdf_path__next_pe (pdf_path *pa, const pdf_coord *cp)
{
pa_elem *pe;
pdf_path__growpath(pa, PA_LENGTH(pa) + 2);
if (PA_LENGTH(pa) == 0) {
pe = &pa->path[pa->num_paths++];
pe->type = PE_TYPE__MOVETO;
pe->p[0].x = cp->x;
pe->p[0].y = cp->y;
return &pa->path[pa->num_paths++];
}
pe = &pa->path[pa->num_paths-1];
switch (pe->type) {
case PE_TYPE__MOVETO:
pe->p[0].x = cp->x;
pe->p[0].y = cp->y;
break;
case PE_TYPE__LINETO:
if (!COORD_EQUAL(&pe->p[0], cp)) {
pe = &pa->path[pa->num_paths++];
pe->type = PE_TYPE__MOVETO;
pe->p[0].x = cp->x;
pe->p[0].y = cp->y;
}
break;
case PE_TYPE__CURVETO:
if (!COORD_EQUAL(&pe->p[2], cp)) {
pe = &pa->path[pa->num_paths++];
pe->type = PE_TYPE__MOVETO;
pe->p[0].x = cp->x;
pe->p[0].y = cp->y;
}
break;
case PE_TYPE__CURVETO_Y:
case PE_TYPE__CURVETO_V:
if (!COORD_EQUAL(&pe->p[1], cp)) {
pe = &pa->path[pa->num_paths++];
pe->type = PE_TYPE__MOVETO;
pe->p[0].x = cp->x;
pe->p[0].y = cp->y;
}
break;
case PE_TYPE__CLOSEPATH:
pe = &pa->path[pa->num_paths++];
pe->type = PE_TYPE__MOVETO;
pe->p[0].x = cp->x;
pe->p[0].y = cp->y;
break;
}
return &pa->path[pa->num_paths++];
}
static int
pdf_path__transform (pdf_path *pa, const pdf_tmatrix *M)
{
pa_elem *pe;
unsigned int n = 0, i;
assert(pa && M);
for (i = 0; i < PA_LENGTH(pa); i++) {
pe = &(pa->path[i]);
n = PE_N_PTS(pe);
while (n-- > 0)
pdf_coord__transform(&(pe->p[n]), M);
}
return 0;
}
/* Path Construction */
static int
pdf_path__lineto (pdf_path *pa,
pdf_coord *cp,
const pdf_coord *p0)
{
pa_elem *pe;
pe = pdf_path__next_pe(pa, cp);
pe->type = PE_TYPE__LINETO;
pe->p[0].x = cp->x = p0->x;
pe->p[0].y = cp->y = p0->y;
return 0;
}
static int
pdf_path__curveto (pdf_path *pa,
pdf_coord *cp,
const pdf_coord *p0,
const pdf_coord *p1,
const pdf_coord *p2
)
{
pa_elem *pe;
pe = pdf_path__next_pe(pa, cp);
if (COORD_EQUAL(cp, p0)) {
pe->type = PE_TYPE__CURVETO_V;
pe->p[0].x = p1->x;
pe->p[0].y = p1->y;
pe->p[1].x = cp->x = p2->x;
pe->p[1].y = cp->y = p2->y;
} else if (COORD_EQUAL(p1, p2)) {
pe->type = PE_TYPE__CURVETO_Y;
pe->p[0].x = p0->x;
pe->p[0].y = p0->y;
pe->p[1].x = cp->x = p1->x;
pe->p[1].y = cp->y = p1->y;
} else {
pe->type = PE_TYPE__CURVETO;
pe->p[0].x = p0->x;
pe->p[0].y = p0->y;
pe->p[1].x = p1->x;
pe->p[1].y = p1->y;
pe->p[2].x = cp->x = p2->x;
pe->p[2].y = cp->y = p2->y;
}
return 0;
}
/* This isn't specified as cp to somewhere. */
static int
pdf_path__elliptarc (pdf_path *pa,
pdf_coord *cp,
const pdf_coord *ca, /* ellipsis center */
double r_x, /* x radius */
double r_y, /* y radius */
double xar, /* x-axis-rotation (deg!) */
double a_0, /* start angle */
double a_1, /* stop angle */
int a_d /* arc orientation */
)
{
double b, b_x, b_y;
double d_a, q;
pdf_coord p0, p1, p2, p3;
pdf_coord e0, e1;
pdf_tmatrix T;
int n_c; /* number of segments */
int i, error = 0;
if (fabs(r_x) < OUR_EPSILON || fabs(r_y) < OUR_EPSILON)
return -1;
if (a_d < 0) {
for ( ; a_1 > a_0; a_1 -= 360.0);
} else {
for ( ; a_1 < a_0; a_0 -= 360.0);
}
d_a = a_1 - a_0;
for (n_c = 1; fabs(d_a) > 90.0 * n_c; n_c++);
d_a /= n_c;
if (fabs(d_a) < OUR_EPSILON)
return -1;
a_0 *= M_PI / 180.0;
a_1 *= M_PI / 180.0;
d_a *= M_PI / 180.0;
xar *= M_PI / 180.0;
T.a = cos(xar); T.c = -sin(xar);
T.b = -T.c ; T.d = T.a;
T.e = 0.0 ; T.f = 0.0;
/* A parameter that controls cb-curve (off-curve) points */
b = 4.0 * (1.0 - cos(.5 * d_a)) / (3.0 * sin(.5 * d_a));
b_x = r_x * b;
b_y = r_y * b;
p0.x = r_x * cos(a_0);
p0.y = r_y * sin(a_0);
pdf_coord__transform(&p0, &T);
p0.x += ca->x; p0.y += ca->y;
if (PA_LENGTH(pa) == 0) {
pdf_path__moveto(pa, cp, &p0);
} else if (!COORD_EQUAL(cp, &p0)) {
pdf_path__lineto(pa, cp, &p0); /* add line seg */
}
for (i = 0; !error && i < n_c; i++) {
q = a_0 + i * d_a;
e0.x = cos(q); e0.y = sin(q);
e1.x = cos(q + d_a); e1.y = sin(q + d_a);
/* Condition for tangent vector requirs
* d1 = p1 - p0 = f ( sin a, -cos a)
* d2 = p2 - p3 = g ( sin b, -cos b)
* and from symmetry
* g^2 = f^2
*/
p0.x = r_x * e0.x; /* s.p. */
p0.y = r_y * e0.y;
p3.x = r_x * e1.x; /* e.p. */
p3.y = r_y * e1.y;
p1.x = -b_x * e0.y;
p1.y = b_y * e0.x;
p2.x = b_x * e1.y;
p2.y = -b_y * e1.x;
pdf_coord__transform(&p0, &T);
pdf_coord__transform(&p1, &T);
pdf_coord__transform(&p2, &T);
pdf_coord__transform(&p3, &T);
p0.x += ca->x; p0.y += ca->y;
p3.x += ca->x; p3.y += ca->y;
p1.x += p0.x ; p1.y += p0.y ;
p2.x += p3.x ; p2.y += p3.y ;
error = pdf_path__curveto(pa, &p0, &p1, &p2, &p3);
cp->x = p3.x; cp->y = p3.y;
}
return error;
}
static int
pdf_path__closepath (pdf_path *pa, pdf_coord *cp /* no arg */)
{
pa_elem *pe = NULL;
int i;
/* search for start point of the last subpath */
for (i = PA_LENGTH(pa) - 1; i >= 0; i--) {
pe = &pa->path[i];
if (pe->type == PE_TYPE__MOVETO)
break;
}
if (!pe || i < 0)
return -1; /* No path or no start point(!) */
cp->x = pe->p[0].x;
cp->y = pe->p[0].y;
pdf_path__growpath(pa, PA_LENGTH(pa) + 1);
/* NOTE:
* Manually closed path without closepath is not
* affected by linejoin. A path with coincidental
* starting and ending point is not the same as
* 'closed' path.
*/
pe = &pa->path[pa->num_paths++];
pe->type = PE_TYPE__CLOSEPATH;
return 0;
}
/*
* x y width height re
*
* is equivalent to
*
* x y m
* (x + width) y l
* (x + width) (y + height) l
* x (y + height) l
* h
*/
/* Just for quick test */
static /* __inline__ */ int
pdf_path__isarect (pdf_path *pa,
int f_ir /* fill-rule is ignorable */
)
{
pa_elem *pe0, *pe1, *pe2, *pe3, *pe4;
if (PA_LENGTH(pa) == 5) {
pe0 = &(pa->path[0]);
pe1 = &(pa->path[1]);
pe2 = &(pa->path[2]);
pe3 = &(pa->path[3]);
pe4 = &(pa->path[4]);
if (pe0->type == PE_TYPE__MOVETO &&
pe1->type == PE_TYPE__LINETO &&
pe2->type == PE_TYPE__LINETO &&
pe3->type == PE_TYPE__LINETO &&
pe4->type == PE_TYPE__CLOSEPATH) {
if (pe1->p[0].y - pe0->p[0].y == 0 &&
pe2->p[0].x - pe1->p[0].x == 0 &&
pe3->p[0].y - pe2->p[0].y == 0) {
if (pe1->p[0].x - pe0->p[0].x
== pe2->p[0].x - pe3->p[0].x) {
return 1;
}
/* Winding number is different but ignore it here. */
} else if (f_ir &&
pe1->p[0].x - pe0->p[0].x == 0 &&
pe2->p[0].y - pe1->p[0].y == 0 &&
pe3->p[0].x - pe2->p[0].x == 0) {
if (pe1->p[0].y - pe0->p[0].y
== pe2->p[0].y - pe3->p[0].y) {
return 1;
}
}
}
}
return 0;
}
/* Path Painting */
/* F is obsoleted */
#define PT_OP_VALID(c) ( \
(c) == 'f' || (c) == 'F' || \
(c) == 's' || (c) == 'S' || \
(c) == 'b' || (c) == 'B' || \
(c) == 'W' || (c) == ' ' \
)
static /* __inline__ */ int
INVERTIBLE_MATRIX (const pdf_tmatrix *M)
{
if (fabs(detP(M)) < OUR_EPSILON) {
dpx_warning("Transformation matrix not invertible.");
dpx_warning("--- M = [%g %g %g %g %g %g]",
M->a, M->b, M->c, M->d, M->e, M->f);
return -1;
}
return 0;
}
/* rectfill, rectstroke, rectclip, recteoclip
*
* Draw isolated rectangle without actually doing
* gsave/grestore operation.
*
* TODO:
* linestyle, fill-opacity, stroke-opacity,....
* As this routine draw a single graphics object
* each time, there should be options for specifying
* various drawing styles, which might inherite
* current graphcs state parameter.
*/
static int
pdf_dev__rectshape (const pdf_rect *r,
const pdf_tmatrix *M,
char opchr
)
{
char *buf = fmt_buf;
int len = 0;
int isclip = 0;
pdf_coord p;
double wd, ht;
assert(r && PT_OP_VALID(opchr));
isclip = (opchr == 'W' || opchr == ' ') ? 1 : 0;
/* disallow matrix for clipping.
* q ... clip Q does nothing and
* n M cm ... clip n alter CTM.
*/
if (M && (isclip ||
!INVERTIBLE_MATRIX(M)))
return -1;
graphics_mode();
buf[len++] = ' ';
if (!isclip) {
buf[len++] = 'q';
if (M) {
buf[len++] = ' ';
len += pdf_sprint_matrix(buf + len, M);
buf[len++] = ' ';
buf[len++] = 'c'; buf[len++] = 'm';
}
buf[len++] = ' ';
}
buf[len++] = 'n';
p.x = r->llx; p.y = r->lly;
wd = r->urx - r->llx;
ht = r->ury - r->lly;
buf[len++] = ' ';
len += pdf_sprint_coord (buf + len, &p);
buf[len++] = ' ';
len += pdf_sprint_length(buf + len, wd);
buf[len++] = ' ';
len += pdf_sprint_length(buf + len, ht);
buf[len++] = ' ';
buf[len++] = 'r'; buf[len++] = 'e';
if (opchr != ' ') {
buf[len++] = ' ';
buf[len++] = opchr;
buf[len++] = ' ';
buf[len++] = isclip ? 'n' : 'Q';
}
pdf_doc_add_page_content(buf, len); /* op: q cm n re Q */
return 0;
}
static int path_added = 0;
/* FIXME */
static int
pdf_dev__flushpath (pdf_path *pa,
char opchr,
int rule,
int ignore_rule)
{
pa_elem *pe, *pe1;
char *b = fmt_buf;
int b_len = FORMAT_BUFF_LEN;
pdf_rect r; /* FIXME */
pdf_coord *pt;
int n_pts, n_seg;
int len = 0;
int isclip = 0;
int isrect, i, j;
assert(pa && PT_OP_VALID(opchr));
isclip = (opchr == 'W') ? 1 : 0;
if (PA_LENGTH(pa) <= 0 && path_added == 0)
return 0;
path_added = 0;
graphics_mode();
isrect = pdf_path__isarect(pa, ignore_rule);
if (isrect) {
pe = &(pa->path[0]);
pe1 = &(pa->path[2]);
r.llx = pe->p[0].x;
r.lly = pe->p[0].y;
r.urx = pe1->p[0].x - pe->p[0].x; /* width... */
r.ury = pe1->p[0].y - pe->p[0].y; /* height... */
b[len++] = ' ';
len += pdf_sprint_rect(b + len, &r);
b[len++] = ' ';
b[len++] = 'r';
b[len++] = 'e';
pdf_doc_add_page_content(b, len); /* op: re */
len = 0;
} else {
n_seg = PA_LENGTH(pa);
for (i = 0, len = 0, pe = &pa->path[0];
i < n_seg; pe++, i++) {
n_pts = PE_N_PTS(pe);
for (j = 0, pt = &pe->p[0];
j < n_pts; j++, pt++) {
b[len++] = ' ';
len += pdf_sprint_coord(b + len, pt);
}
b[len++] = ' ';
b[len++] = PE_OPCHR(pe);
if (len + 128 > b_len) {
pdf_doc_add_page_content(b, len); /* op: m l c v y h */
len = 0;
}
}
if (len > 0) {
pdf_doc_add_page_content(b, len); /* op: m l c v y h */
len = 0;
}
}
b[len++] = ' ';
b[len++] = opchr;
if (rule == PDF_FILL_RULE_EVENODD)
b[len++] = '*';
if (isclip) {
b[len++] = ' '; b[len++] = 'n';
}
pdf_doc_add_page_content(b, len); /* op: f F s S b B W f* F* s* S* b* B* W* */
return 0;
}
/* Graphics State */
typedef struct pdf_gstate_
{
pdf_coord cp;
pdf_tmatrix matrix; /* cm, - */
pdf_color strokecolor;
pdf_color fillcolor;
/* colorspace here */
struct {
int num_dash;
double pattern[PDF_DASH_SIZE_MAX];
double offset;
} linedash; /* d, D */
double linewidth; /* w, LW */
int linecap; /* J, LC */
int linejoin; /* j, LJ */
double miterlimit; /* M, ML */
int flatness; /* i, FL, 0 to 100 (0 for use device-default) */
/* internal */
pdf_path path;
int flags;
/* bookkeeping the origin of the last transform applied */
pdf_coord pt_fixee;
} pdf_gstate;
typedef struct m_stack_elem
{
void *data;
struct m_stack_elem *prev;
} m_stack_elem;
typedef struct m_stack
{
int size;
m_stack_elem *top;
m_stack_elem *bottom;
} m_stack;
static void
m_stack_init (m_stack *stack)
{
assert(stack);
stack->size = 0;
stack->top = NULL;
stack->bottom = NULL;
return;
}
static void
m_stack_push (m_stack *stack, void *data)
{
m_stack_elem *elem;
assert(stack);
elem = NEW(1, m_stack_elem);
elem->prev = stack->top;
elem->data = data;
stack->top = elem;
if (stack->size == 0)
stack->bottom = elem;
stack->size++;
return;
}
static void *
m_stack_pop (m_stack *stack)
{
m_stack_elem *elem;
void *data;
assert(stack);
if (stack->size == 0)
return NULL;
data = stack->top->data;
elem = stack->top;
stack->top = elem->prev;
if (stack->size == 1)
stack->bottom = NULL;
free(elem);
stack->size--;
return data;
}
static void *
m_stack_top (m_stack *stack)
{
void *data;
assert(stack);
if (stack->size == 0)
return NULL;
data = stack->top->data;
return data;
}
#define m_stack_depth(s) ((s)->size)
static m_stack gs_stack;
static void
init_a_gstate (pdf_gstate *gs)
{
gs->cp.x = 0.0;
gs->cp.y = 0.0;
pdf_setmatrix(&gs->matrix, 1.0, 0.0, 0.0, 1.0, 0.0, 0.0);
pdf_color_black(&gs->strokecolor);
pdf_color_black(&gs->fillcolor);
gs->linedash.num_dash = 0;
gs->linedash.offset = 0;
gs->linecap = 0;
gs->linejoin = 0;
gs->linewidth = 1.0;
gs->miterlimit = 10.0;
gs->flatness = 1; /* default to 1 in PDF */
/* Internal variables */
gs->flags = 0;
init_a_path(&gs->path);
gs->pt_fixee.x = 0;
gs->pt_fixee.y = 0;
return;
}
static void
clear_a_gstate (pdf_gstate *gs)
{
clear_a_path(&gs->path);
memset(gs, 0, sizeof(pdf_gstate));
return;
}
static void
copy_a_gstate (pdf_gstate *gs1, pdf_gstate *gs2)
{
int i;
assert(gs1 && gs2);
gs1->cp.x = gs2->cp.x;
gs1->cp.y = gs2->cp.y;
pdf_copymatrix(&gs1->matrix, &gs2->matrix);
/* TODO:
* Path should be linked list and gsave only
* record starting point within path rather than
* copying whole path.
*/
pdf_path__copypath(&gs1->path, &gs2->path);
gs1->linedash.num_dash = gs2->linedash.num_dash;
for (i = 0; i < gs2->linedash.num_dash; i++) {
gs1->linedash.pattern[i] = gs2->linedash.pattern[i];
}
gs1->linedash.offset = gs2->linedash.offset;
gs1->linecap = gs2->linecap;
gs1->linejoin = gs2->linejoin;
gs1->linewidth = gs2->linewidth;
gs1->miterlimit = gs2->miterlimit;
gs1->flatness = gs2->flatness;
pdf_color_copycolor(&gs1->fillcolor , &gs2->fillcolor);
pdf_color_copycolor(&gs1->strokecolor, &gs2->strokecolor);
gs1->pt_fixee.x = gs2->pt_fixee.x;
gs1->pt_fixee.y = gs2->pt_fixee.y;
return;
}
void
pdf_dev_init_gstates (void)
{