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|
/*
This is dvipdfmx, an eXtended version of dvipdfm by Mark A. Wicks.
Copyright (C) 2002-2012 by Jin-Hwan Cho and Shunsaku Hirata,
the dvipdfmx project team.
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.
*/
/*
* Subsetting glyf, updating loca, hmtx, ...
*
*/
#include "config.h"
#include "system.h"
#include "mem.h"
#include "error.h"
#include "dpxutil.h"
#include "sfnt.h"
#include "tt_table.h"
#include "tt_glyf.h"
#define NUM_GLYPH_LIMIT 65534
#define TABLE_DATA_ALLOC_SIZE 40960
#define GLYPH_ARRAY_ALLOC_SIZE 256
static USHORT
find_empty_slot (struct tt_glyphs *g)
{
USHORT gid;
ASSERT(g);
for (gid = 0; gid < NUM_GLYPH_LIMIT; gid++) {
if (!(g->used_slot[gid/8] & (1 << (7 - (gid % 8)))))
break;
}
if (gid == NUM_GLYPH_LIMIT)
ERROR("No empty glyph slot available.");
return gid;
}
USHORT
tt_find_glyph (struct tt_glyphs *g, USHORT gid)
{
USHORT idx, new_gid = 0;
ASSERT(g);
for (idx = 0; idx < g->num_glyphs; idx++) {
if (gid == g->gd[idx].ogid) {
new_gid = g->gd[idx].gid;
break;
}
}
return new_gid;
}
USHORT
tt_get_index (struct tt_glyphs *g, USHORT gid)
{
USHORT idx;
ASSERT(g);
for (idx = 0; idx < g->num_glyphs; idx++) {
if (gid == g->gd[idx].gid)
break;
}
if (idx == g->num_glyphs)
idx = 0;
return idx;
}
USHORT
tt_add_glyph (struct tt_glyphs *g, USHORT gid, USHORT new_gid)
{
ASSERT(g);
if (g->used_slot[new_gid/8] & (1 << (7 - (new_gid % 8)))) {
WARN("Slot %u already used.", new_gid);
} else {
if (g->num_glyphs+1 >= NUM_GLYPH_LIMIT)
ERROR("Too many glyphs.");
if (g->num_glyphs >= g->max_glyphs) {
g->max_glyphs += GLYPH_ARRAY_ALLOC_SIZE;
g->gd = RENEW(g->gd, g->max_glyphs, struct tt_glyph_desc);
}
g->gd[g->num_glyphs].gid = new_gid;
g->gd[g->num_glyphs].ogid = gid;
g->gd[g->num_glyphs].length = 0;
g->gd[g->num_glyphs].data = NULL;
g->used_slot[new_gid/8] |= (1 << (7 - (new_gid % 8)));
g->num_glyphs += 1;
}
if (new_gid > g->last_gid) {
g->last_gid = new_gid;
}
return new_gid;
}
/*
* Initialization
*/
struct tt_glyphs *
tt_build_init (void)
{
struct tt_glyphs *g;
g = NEW(1, struct tt_glyphs);
g->num_glyphs = 0;
g->max_glyphs = 0;
g->last_gid = 0;
g->emsize = 1;
g->default_advh = 0;
g->default_tsb = 0;
g->gd = NULL;
g->used_slot = NEW(8192, unsigned char);
memset(g->used_slot, 0, 8192);
tt_add_glyph(g, 0, 0);
return g;
}
void
tt_build_finish (struct tt_glyphs *g)
{
if (g) {
if (g->gd) {
USHORT idx;
for (idx = 0; idx < g->num_glyphs; idx++) {
if (g->gd[idx].data)
RELEASE(g->gd[idx].data);
}
RELEASE(g->gd);
}
if (g->used_slot)
RELEASE(g->used_slot);
RELEASE(g);
}
}
static int CDECL
glyf_cmp (const void *v1, const void *v2)
{
int cmp = 0;
const struct tt_glyph_desc *sv1, *sv2;
sv1 = (const struct tt_glyph_desc *) v1;
sv2 = (const struct tt_glyph_desc *) v2;
if (sv1->gid == sv2->gid)
cmp = 0;
else if (sv1->gid < sv2->gid)
cmp = -1;
else
cmp = 1;
return cmp;
}
/*
* TrueType outline data.
*/
#define ARG_1_AND_2_ARE_WORDS (1 << 0)
#define ARGS_ARE_XY_VALUES (1 << 1)
#define ROUND_XY_TO_GRID (1 << 2)
#define WE_HAVE_A_SCALE (1 << 3)
#define RESERVED (1 << 4)
#define MORE_COMPONENT (1 << 5)
#define WE_HAVE_AN_X_AND_Y_SCALE (1 << 6)
#define WE_HAVE_A_TWO_BY_TWO (1 << 7)
#define WE_HAVE_INSTRUCTIONS (1 << 8)
#define USE_MY_METRICS (1 << 9)
int
tt_build_tables (sfnt *sfont, struct tt_glyphs *g)
{
char *hmtx_table_data = NULL, *loca_table_data = NULL;
char *glyf_table_data = NULL;
ULONG hmtx_table_size, loca_table_size, glyf_table_size;
/* some information available from other TrueType table */
struct tt_head_table *head = NULL;
struct tt_hhea_table *hhea = NULL;
struct tt_maxp_table *maxp = NULL;
struct tt_longMetrics *hmtx, *vmtx = NULL;
struct tt_os2__table *os2;
/* temp */
ULONG *location, offset;
long i;
USHORT *w_stat; /* Estimate most frequently appeared width */
ASSERT(g);
if (sfont == NULL ||
#ifdef XETEX
sfont->ft_face == NULL
#else
sfont->stream == NULL
#endif
)
ERROR("File not opened.");
if (sfont->type != SFNT_TYPE_TRUETYPE &&
sfont->type != SFNT_TYPE_TTC &&
sfont->type != SFNT_TYPE_DFONT)
ERROR("Invalid font type");
if (g->num_glyphs > NUM_GLYPH_LIMIT)
ERROR("Too many glyphs.");
/*
* Read head, hhea, maxp, loca:
*
* unitsPerEm --> head
* numHMetrics --> hhea
* indexToLocFormat --> head
* numGlyphs --> maxp
*/
head = tt_read_head_table(sfont);
hhea = tt_read_hhea_table(sfont);
maxp = tt_read_maxp_table(sfont);
if (hhea->metricDataFormat != 0)
ERROR("Unknown metricDataFormat.");
g->emsize = head->unitsPerEm;
sfnt_locate_table(sfont, "hmtx");
hmtx = tt_read_longMetrics(sfont, maxp->numGlyphs, hhea->numOfLongHorMetrics, hhea->numOfExSideBearings);
os2 = tt_read_os2__table(sfont);
if (os2) {
g->default_advh = os2->sTypoAscender - os2->sTypoDescender;
g->default_tsb = g->default_advh - os2->sTypoAscender;
}
if (sfnt_find_table_pos(sfont, "vmtx") > 0) {
struct tt_vhea_table *vhea;
vhea = tt_read_vhea_table(sfont);
sfnt_locate_table(sfont, "vmtx");
vmtx = tt_read_longMetrics(sfont, maxp->numGlyphs, vhea->numOfLongVerMetrics, vhea->numOfExSideBearings);
RELEASE(vhea);
} else {
vmtx = NULL;
}
sfnt_locate_table(sfont, "loca");
location = NEW(maxp->numGlyphs + 1, ULONG);
if (head->indexToLocFormat == 0) {
for (i = 0; i <= maxp->numGlyphs; i++)
location[i] = 2*((ULONG) sfnt_get_ushort(sfont));
} else if (head->indexToLocFormat == 1) {
for (i = 0; i <= maxp->numGlyphs; i++)
location[i] = sfnt_get_ulong(sfont);
} else {
ERROR("Unknown IndexToLocFormat.");
}
w_stat = NEW(g->emsize+2, USHORT);
memset(w_stat, 0, sizeof(USHORT)*(g->emsize+2));
/*
* Read glyf table.
*/
offset = sfnt_locate_table(sfont, "glyf");
/*
* The num_glyphs may grow when composite glyph is found.
* A component of glyph refered by a composite glyph is appended
* to used_glyphs if it is not already registered in used_glyphs.
* Glyph programs of composite glyphs are modified so that it
* correctly refer to new gid of their components.
*/
for (i = 0; i < NUM_GLYPH_LIMIT; i++) {
USHORT gid; /* old gid */
ULONG loc, len;
BYTE *p, *endptr;
SHORT number_of_contours;
if (i >= g->num_glyphs) /* finished */
break;
gid = g->gd[i].ogid;
if (gid >= maxp->numGlyphs)
ERROR("Invalid glyph index (gid %u)", gid);
loc = location[gid];
len = location[gid+1] - loc;
g->gd[i].advw = hmtx[gid].advance;
g->gd[i].lsb = hmtx[gid].sideBearing;
if (vmtx) {
g->gd[i].advh = vmtx[gid].advance;
g->gd[i].tsb = vmtx[gid].sideBearing;
} else {
g->gd[i].advh = g->default_advh;
g->gd[i].tsb = g->default_tsb;
}
g->gd[i].length = len;
g->gd[i].data = NULL;
if (g->gd[i].advw <= g->emsize) {
w_stat[g->gd[i].advw] += 1;
} else {
w_stat[g->emsize+1] += 1; /* larger than em */
}
if (len == 0) { /* Does not contains any data. */
continue;
} else if (len < 10) {
ERROR("Invalid TrueType glyph data (gid %u).", gid);
}
g->gd[i].data = p = NEW(len, BYTE);
endptr = p + len;
sfnt_seek_set(sfont, offset+loc);
number_of_contours = sfnt_get_short(sfont);
p += sfnt_put_short(p, number_of_contours);
/* BoundingBox: FWord x 4 */
g->gd[i].llx = sfnt_get_short(sfont);
g->gd[i].lly = sfnt_get_short(sfont);
g->gd[i].urx = sfnt_get_short(sfont);
g->gd[i].ury = sfnt_get_short(sfont);
/* _FIXME_ */
#if 1
if (!vmtx) /* vertOriginY == sTypeAscender */
g->gd[i].tsb = g->default_advh - g->default_tsb - g->gd[i].ury;
#endif
p += sfnt_put_short(p, g->gd[i].llx);
p += sfnt_put_short(p, g->gd[i].lly);
p += sfnt_put_short(p, g->gd[i].urx);
p += sfnt_put_short(p, g->gd[i].ury);
/* Read evrything else. */
sfnt_read(p, len - 10, sfont);
/*
* Fix GIDs of composite glyphs.
*/
if (number_of_contours < 0) {
USHORT flags, cgid, new_gid; /* flag, gid of a component */
do {
if (p >= endptr)
ERROR("Invalid TrueType glyph data (gid %u): %u bytes", gid, len);
/*
* Flags and gid of component glyph are both USHORT.
*/
flags = ((*p) << 8)| *(p+1);
p += 2;
cgid = ((*p) << 8)| *(p+1);
if (cgid >= maxp->numGlyphs) {
ERROR("Invalid gid (%u > %u) in composite glyph %u.", cgid, maxp->numGlyphs, gid);
}
new_gid = tt_find_glyph(g, cgid);
if (new_gid == 0) {
new_gid = tt_add_glyph(g, cgid, find_empty_slot(g));
}
p += sfnt_put_ushort(p, new_gid);
/*
* Just skip remaining part.
*/
p += (flags & ARG_1_AND_2_ARE_WORDS) ? 4 : 2;
if (flags & WE_HAVE_A_SCALE) /* F2Dot14 */
p += 2;
else if (flags & WE_HAVE_AN_X_AND_Y_SCALE) /* F2Dot14 x 2 */
p += 4;
else if (flags & WE_HAVE_A_TWO_BY_TWO) /* F2Dot14 x 4 */
p += 8;
} while (flags & MORE_COMPONENT);
/*
* TrueType instructions comes here:
* length_of_instruction (ushort)
* instruction (byte * length_of_instruction)
*/
}
}
RELEASE(location);
RELEASE(hmtx);
if (vmtx)
RELEASE(vmtx);
{
int max_count = -1;
g->dw = g->gd[0].advw;
for (i = 0; i < g->emsize + 1; i++) {
if (w_stat[i] > max_count) {
max_count = w_stat[i];
g->dw = i;
}
}
}
RELEASE(w_stat);
qsort(g->gd, g->num_glyphs, sizeof(struct tt_glyph_desc), glyf_cmp);
{
USHORT prev, last_advw;
char *p, *q;
int padlen, num_hm_known;
glyf_table_size = 0UL;
num_hm_known = 0;
last_advw = g->gd[g->num_glyphs - 1].advw;
for (i = g->num_glyphs - 1; i >= 0; i--) {
padlen = (g->gd[i].length % 4) ? (4 - (g->gd[i].length % 4)) : 0;
glyf_table_size += g->gd[i].length + padlen;
if (!num_hm_known && last_advw != g->gd[i].advw) {
hhea->numOfLongHorMetrics = g->gd[i].gid + 2;
num_hm_known = 1;
}
}
/* All advance widths are same. */
if (!num_hm_known) {
hhea->numOfLongHorMetrics = 1;
}
hmtx_table_size = hhea->numOfLongHorMetrics * 2 + (g->last_gid + 1) * 2;
/*
* Choosing short format does not always give good result
* when compressed. Sometimes increases size.
*/
if (glyf_table_size < 0x20000UL) {
head->indexToLocFormat = 0;
loca_table_size = (g->last_gid + 2)*2;
} else {
head->indexToLocFormat = 1;
loca_table_size = (g->last_gid + 2)*4;
}
hmtx_table_data = p = NEW(hmtx_table_size, char);
loca_table_data = q = NEW(loca_table_size, char);
glyf_table_data = NEW(glyf_table_size, char);
offset = 0UL; prev = 0;
for (i = 0; i < g->num_glyphs; i++) {
long gap, j;
gap = (long) g->gd[i].gid - prev - 1;
for (j = 1; j <= gap; j++) {
if (prev + j == hhea->numOfLongHorMetrics - 1) {
p += sfnt_put_ushort(p, last_advw);
} else if (prev + j < hhea->numOfLongHorMetrics) {
p += sfnt_put_ushort(p, 0);
}
p += sfnt_put_short (p, 0);
if (head->indexToLocFormat == 0) {
q += sfnt_put_ushort(q, (USHORT) (offset/2));
} else {
q += sfnt_put_ulong(q, offset);
}
}
padlen = (g->gd[i].length % 4) ? (4 - (g->gd[i].length % 4)) : 0;
if (g->gd[i].gid < hhea->numOfLongHorMetrics) {
p += sfnt_put_ushort(p, g->gd[i].advw);
}
p += sfnt_put_short (p, g->gd[i].lsb);
if (head->indexToLocFormat == 0) {
q += sfnt_put_ushort(q, (USHORT) (offset/2));
} else {
q += sfnt_put_ulong(q, offset);
}
memset(glyf_table_data + offset, 0, g->gd[i].length + padlen);
memcpy(glyf_table_data + offset, g->gd[i].data, g->gd[i].length);
offset += g->gd[i].length + padlen;
prev = g->gd[i].gid;
/* free data here since it consume much memory */
RELEASE(g->gd[i].data);
g->gd[i].length = 0; g->gd[i].data = NULL;
}
if (head->indexToLocFormat == 0) {
q += sfnt_put_ushort(q, (USHORT) (offset/2));
} else {
q += sfnt_put_ulong(q, offset);
}
sfnt_set_table(sfont, "hmtx", (char *) hmtx_table_data, hmtx_table_size);
sfnt_set_table(sfont, "loca", (char *) loca_table_data, loca_table_size);
sfnt_set_table(sfont, "glyf", (char *) glyf_table_data, glyf_table_size);
}
head->checkSumAdjustment = 0;
maxp->numGlyphs = g->last_gid + 1;
/* TODO */
sfnt_set_table(sfont, "maxp", tt_pack_maxp_table(maxp), TT_MAXP_TABLE_SIZE);
sfnt_set_table(sfont, "hhea", tt_pack_hhea_table(hhea), TT_HHEA_TABLE_SIZE);
sfnt_set_table(sfont, "head", tt_pack_head_table(head), TT_HEAD_TABLE_SIZE);
RELEASE(maxp);
RELEASE(hhea);
RELEASE(head);
if (os2)
RELEASE(os2);
return 0;
}
int
tt_get_metrics (sfnt *sfont, struct tt_glyphs *g)
{
struct tt_head_table *head = NULL;
struct tt_hhea_table *hhea = NULL;
struct tt_maxp_table *maxp = NULL;
struct tt_longMetrics *hmtx, *vmtx = NULL;
struct tt_os2__table *os2;
/* temp */
ULONG *location, offset;
long i;
USHORT *w_stat;
ASSERT(g);
if (sfont == NULL ||
#ifdef XETEX
sfont->ft_face == NULL
#else
sfont->stream == NULL
#endif
)
ERROR("File not opened.");
if (sfont->type != SFNT_TYPE_TRUETYPE &&
sfont->type != SFNT_TYPE_TTC &&
sfont->type != SFNT_TYPE_DFONT)
ERROR("Invalid font type");
/*
* Read head, hhea, maxp, loca:
*
* unitsPerEm --> head
* numHMetrics --> hhea
* indexToLocFormat --> head
* numGlyphs --> maxp
*/
head = tt_read_head_table(sfont);
hhea = tt_read_hhea_table(sfont);
maxp = tt_read_maxp_table(sfont);
if (hhea->metricDataFormat != 0)
ERROR("Unknown metricDataFormat.");
g->emsize = head->unitsPerEm;
sfnt_locate_table(sfont, "hmtx");
hmtx = tt_read_longMetrics(sfont, maxp->numGlyphs, hhea->numOfLongHorMetrics, hhea->numOfExSideBearings);
os2 = tt_read_os2__table(sfont);
g->default_advh = os2->sTypoAscender - os2->sTypoDescender;
g->default_tsb = g->default_advh - os2->sTypoAscender;
if (sfnt_find_table_pos(sfont, "vmtx") > 0) {
struct tt_vhea_table *vhea;
vhea = tt_read_vhea_table(sfont);
sfnt_locate_table(sfont, "vmtx");
vmtx = tt_read_longMetrics(sfont, maxp->numGlyphs, vhea->numOfLongVerMetrics, vhea->numOfExSideBearings);
RELEASE(vhea);
} else {
vmtx = NULL;
}
sfnt_locate_table(sfont, "loca");
location = NEW(maxp->numGlyphs + 1, ULONG);
if (head->indexToLocFormat == 0) {
for (i = 0; i <= maxp->numGlyphs; i++)
location[i] = 2*((ULONG) sfnt_get_ushort(sfont));
} else if (head->indexToLocFormat == 1) {
for (i = 0; i <= maxp->numGlyphs; i++)
location[i] = sfnt_get_ulong(sfont);
} else {
ERROR("Unknown IndexToLocFormat.");
}
w_stat = NEW(g->emsize+2, USHORT);
memset(w_stat, 0, sizeof(USHORT)*(g->emsize+2));
/*
* Read glyf table.
*/
offset = sfnt_locate_table(sfont, "glyf");
for (i = 0; i < g->num_glyphs; i++) {
USHORT gid; /* old gid */
ULONG loc, len;
SHORT number_of_contours;
gid = g->gd[i].ogid;
if (gid >= maxp->numGlyphs)
ERROR("Invalid glyph index (gid %u)", gid);
loc = location[gid];
len = location[gid+1] - loc;
g->gd[i].advw = hmtx[gid].advance;
g->gd[i].lsb = hmtx[gid].sideBearing;
if (vmtx) {
g->gd[i].advh = vmtx[gid].advance;
g->gd[i].tsb = vmtx[gid].sideBearing;
} else {
g->gd[i].advh = g->default_advh;
g->gd[i].tsb = g->default_tsb;
}
g->gd[i].length = len;
g->gd[i].data = NULL;
if (g->gd[i].advw <= g->emsize) {
w_stat[g->gd[i].advw] += 1;
} else {
w_stat[g->emsize+1] += 1; /* larger than em */
}
if (len == 0) { /* Does not contains any data. */
continue;
} else if (len < 10) {
ERROR("Invalid TrueType glyph data (gid %u).", gid);
}
sfnt_seek_set(sfont, offset+loc);
number_of_contours = sfnt_get_short(sfont);
/* BoundingBox: FWord x 4 */
g->gd[i].llx = sfnt_get_short(sfont);
g->gd[i].lly = sfnt_get_short(sfont);
g->gd[i].urx = sfnt_get_short(sfont);
g->gd[i].ury = sfnt_get_short(sfont);
/* _FIXME_ */
#if 1
if (!vmtx) /* vertOriginY == sTypeAscender */
g->gd[i].tsb = g->default_advh - g->default_tsb - g->gd[i].ury;
#endif
}
RELEASE(location);
RELEASE(hmtx);
RELEASE(maxp);
RELEASE(hhea);
RELEASE(head);
RELEASE(os2);
if (vmtx)
RELEASE(vmtx);
{
int max_count = -1;
g->dw = g->gd[0].advw;
for (i = 0; i < g->emsize + 1; i++) {
if (w_stat[i] > max_count) {
max_count = w_stat[i];
g->dw = i;
}
}
}
RELEASE(w_stat);
return 0;
}
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