ref: 00b9b4736f1ee8bf19a143f3eb8f4811c60e78cd
dir: /otf.c/
/* OpenType and TrueType fonts */
#include <arpa/inet.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "mkfn.h"
#define MAX(a, b) ((a) < (b) ? (b) : (a))
#define LEN(a) (sizeof(a) / sizeof((a)[0]))
#define NGLYPHS (1 << 16)
#define NLOOKUPS (1 << 12)
#define GNLEN (64)
#define NGRPS 2048
#define U32(buf, off) (htonl(*(u32 *) ((buf) + (off))))
#define U16(buf, off) (htons(*(u16 *) ((buf) + (off))))
#define U8(buf, off) (*(u8 *) ((buf) + (off)))
#define S16(buf, off) ((s16) htons(*(u16 *) ((buf) + (off))))
#define S32(buf, off) ((s32) htonl(*(u32 *) ((buf) + (off))))
#define GCTXLEN 16 /* number of context backtrack coverage arrays */
typedef unsigned int u32;
typedef unsigned short u16;
typedef unsigned char u8;
typedef int s32;
typedef short s16;
static char glyph_name[NGLYPHS][GNLEN];
static int glyph_code[NGLYPHS];
static int glyph_bbox[NGLYPHS][4];
static int glyph_wid[NGLYPHS];
static int glyph_n;
static int upm; /* units per em */
struct otf {
void *otf; /* TTC header or offset table */
void *off; /* offset table */
char name[128]; /* font name */
};
static char *macset[];
static char *stdset[];
static int owid(int w)
{
return (w < 0 ? w * 1000 - upm / 2 : w * 1000 + upm / 2) / upm;
}
static int uwid(int w)
{
int d = 72000 / mkfn_res;
return (w < 0 ? owid(w) - d / 20 : owid(w) + d / 20) * 10 / d;
}
/* whether the script is right-to-left */
static int otf_r2l(char *feat)
{
char *scrp = strchr(feat, ':') + 1;
return !strcmp("arab", scrp) || !strcmp("hebr", scrp);
}
/* report unsupported otf tables */
static void otf_unsupported(char *sub, int type, int fmt)
{
if (mkfn_warn) {
fprintf(stderr, "neatmkfn: unsupported %s lookup %d", sub, type);
if (fmt > 0)
fprintf(stderr, " format %d", fmt);
fprintf(stderr, "\n");
}
}
/* find the otf table with the given name */
static void *otf_table(struct otf *otf, char *name)
{
int nrecs = U16(otf->off, 4);
int i;
for (i = 0; i < nrecs; i++) {
void *rec = otf->off + 12 + i * 16; /* an otf table record */
if (!strncmp(rec, name, 4))
return otf->otf + U32(rec, 8);
}
return NULL;
}
/* obtain postscript font name from name table */
static void otf_name(struct otf *otf, void *tab)
{
char name[256];
void *str = tab + U16(tab, 4); /* storage area */
int n = U16(tab, 2); /* number of name records */
int i;
for (i = 0; i < n; i++) {
void *rec = tab + 6 + 12 * i;
int pid = U16(rec, 0); /* platform id */
int eid = U16(rec, 2); /* encoding id */
int lid = U16(rec, 4); /* language id */
int nid = U16(rec, 6); /* name id */
int len = U16(rec, 8); /* string length */
int off = U16(rec, 10); /* string offset */
if (pid == 1 && eid == 0 && lid == 0 && nid == 6) {
memcpy(name, str + off, len);
name[len] = '\0';
snprintf(otf->name, sizeof(otf->name), "%s", name);
}
}
}
/* parse otf cmap format 4 subtable */
static void otf_cmap4(struct otf *otf, void *cmap4)
{
int nsegs;
void *ends, *begs, *deltas, *offsets;
int beg, end, delta, offset;
int i, j;
nsegs = U16(cmap4, 6) / 2;
ends = cmap4 + 14;
begs = ends + 2 * nsegs + 2;
deltas = begs + 2 * nsegs;
offsets = deltas + 2 * nsegs;
for (i = 0; i < nsegs; i++) {
beg = U16(begs, 2 * i);
end = U16(ends, 2 * i);
delta = U16(deltas, 2 * i);
offset = U16(offsets, 2 * i);
if (offset) {
for (j = beg; j <= end; j++)
glyph_code[(U16(offsets + 2 * i,
offset + (j - beg) * 2) + delta) & 0xffff] = j;
} else {
for (j = beg; j <= end; j++)
glyph_code[(j + delta) & 0xffff] = j;
}
}
}
/* parse otf cmap header */
static void otf_cmap(struct otf *otf, void *cmap)
{
int nrecs = U16(cmap, 2);
int i;
for (i = 0; i < nrecs; i++) {
void *rec = cmap + 4 + i * 8; /* a cmap record */
int plat = U16(rec, 0);
int enc = U16(rec, 2);
void *tab = cmap + U32(rec, 4); /* a cmap subtable */
int fmt = U16(tab, 0);
if (plat == 3 && enc == 1 && fmt == 4)
otf_cmap4(otf, tab);
}
}
static void otf_post(struct otf *otf, void *post)
{
void *post2; /* version 2.0 header */
void *index; /* glyph name indices */
void *names; /* glyph names */
int cname = 0;
int i;
if (U32(post, 0) != 0x20000)
return;
post2 = post + 32;
glyph_n = U16(post2, 0);
index = post2 + 2;
names = index + 2 * glyph_n;
for (i = 0; i < glyph_n; i++) {
int idx = U16(index, 2 * i);
if (idx < 258) {
strcpy(glyph_name[i], macset[idx]);
} else {
memcpy(glyph_name[i], names + cname + 1,
U8(names, cname));
glyph_name[i][U8(names, cname)] = '\0';
cname += U8(names, cname) + 1;
}
}
}
static void otf_glyf(struct otf *otf, void *glyf)
{
void *maxp = otf_table(otf, "maxp");
void *head = otf_table(otf, "head");
void *loca = otf_table(otf, "loca");
void *gdat;
void *gdat_next;
int n = U16(maxp, 4);
int fmt = U16(head, 50);
int i, j;
if (!glyph_n)
glyph_n = n;
for (i = 0; i < n; i++) {
if (fmt) {
gdat = glyf + U32(loca, 4 * i);
gdat_next = glyf + U32(loca, 4 * (i + 1));
} else {
gdat = glyf + U16(loca, 2 * i) * 2;
gdat_next = glyf + U16(loca, 2 * (i + 1)) * 2;
}
if (gdat < gdat_next)
for (j = 0; j < 4; j++)
glyph_bbox[i][j] = S16(gdat, 2 + 2 * j);
}
}
static void otf_hmtx(struct otf *otf, void *hmtx)
{
void *hhea = otf_table(otf, "hhea");
int n;
int i;
n = U16(hhea, 34);
for (i = 0; i < n; i++)
glyph_wid[i] = U16(hmtx, i * 4);
for (i = n; i < glyph_n; i++)
glyph_wid[i] = glyph_wid[n - 1];
}
static void otf_kern(struct otf *otf, void *kern)
{
int off = 4;
int i, j;
int n = U16(kern, 2); /* number of kern subtables */
for (i = 0; i < n; i++) {
void *tab = kern + off; /* a kern subtable */
int cov = U16(tab, 4);
off += U16(tab, 2);
if ((cov >> 8) == 0 && (cov & 1)) { /* format 0 */
int npairs = U16(tab, 6);
for (j = 0; j < npairs; j++) {
int c1 = U16(tab, 14 + 6 * j);
int c2 = U16(tab, 14 + 6 * j + 2);
int val = S16(tab, 14 + 6 * j + 4);
mkfn_kern(glyph_name[c1], glyph_name[c2],
uwid(val));
}
}
}
}
static int *coverage(void *cov, int *ncov)
{
int fmt = U16(cov, 0);
int n = U16(cov, 2);
int beg, end;
int i, j;
int *out = malloc(glyph_n * sizeof(*out));
int cnt = 0;
if (fmt == 1) {
for (i = 0; i < n; i++)
out[cnt++] = U16(cov, 4 + 2 * i);
}
if (fmt == 2) {
for (i = 0; i < n; i++) {
beg = U16(cov, 4 + 6 * i);
end = U16(cov, 4 + 6 * i + 2);
for (j = beg; j <= end; j++)
out[cnt++] = j;
}
}
if (ncov)
*ncov = cnt;
return out;
}
static int classdef(void *tab, int *gl, int *cls)
{
int fmt = U16(tab, 0);
int ngl = 0;
int i, j;
if (fmt == 1) {
int beg = U16(tab, 2);
ngl = U16(tab, 4);
for (i = 0; i < ngl; i++) {
gl[i] = beg + i;
cls[i] = U16(tab, 6 + 2 * i);
}
}
if (fmt == 2) {
int n = U16(tab, 2);
for (i = 0; i < n; i++) {
int beg = U16(tab, 4 + 6 * i);
int end = U16(tab, 4 + 6 * i + 2);
for (j = beg; j <= end; j++) {
gl[ngl] = j;
cls[ngl] = U16(tab, 4 + 6 * i + 4);
ngl++;
}
}
}
return ngl;
}
static int intcmp(void *v1, void *v2)
{
return *(int *) v1 - *(int *) v2;
}
static int ggrp_make(int *src, int n);
static int ggrp_class(int *src, int *cls, int nsrc, int id)
{
int *g = malloc(nsrc * sizeof(g[0]));
int n = 0;
int i;
int grp;
for (i = 0; i < nsrc; i++)
if (cls[i] == id)
g[n++] = src[i];
qsort(g, n, sizeof(g[0]), (void *) intcmp);
grp = ggrp_make(g, n);
free(g);
return grp;
}
static int ggrp_coverage(int *g, int n)
{
qsort(g, n, sizeof(g[0]), (void *) intcmp);
return ggrp_make(g, n);
}
static int valuerecord_len(int fmt)
{
int off = 0;
int i;
for (i = 0; i < 8; i++)
if (fmt & (1 << i))
off += 2;
return off;
}
static void valuerecord_print(int fmt, void *rec)
{
int vals[8] = {0};
int off = 0;
int i;
for (i = 0; i < 8; i++) {
if (fmt & (1 << i)) {
vals[i] = uwid(S16(rec, off));
off += 2;
}
}
if (fmt)
printf(":%+d%+d%+d%+d", vals[0], vals[1], vals[2], vals[3]);
}
static int valuerecord_small(int fmt, void *rec)
{
int off = 0;
int i;
for (i = 0; i < 8; i++) {
if (fmt & (1 << i)) {
if (abs(uwid(S16(rec, off))) >= MAX(1, mkfn_kmin))
return 0;
off += 2;
}
}
return 1;
}
/* single adjustment positioning */
static void otf_gpostype1(struct otf *otf, void *sub, char *feat)
{
int fmt = U16(sub, 0);
int vfmt = U16(sub, 4);
int *cov;
int ncov, nvals;
int vlen = valuerecord_len(vfmt);
int i;
cov = coverage(sub + U16(sub, 2), &ncov);
if (fmt == 1) {
for (i = 0; i < ncov; i++) {
if (valuerecord_small(vfmt, sub + 6))
continue;
printf("gpos %s 1 %s", feat, glyph_name[cov[i]]);
valuerecord_print(vfmt, sub + 6);
printf("\n");
}
}
if (fmt == 2) {
nvals = U16(sub, 6);
for (i = 0; i < nvals; i++) {
if (valuerecord_small(vfmt, sub + 6))
continue;
printf("gpos %s 1 %s", feat, glyph_name[cov[i]]);
valuerecord_print(vfmt, sub + 8 + i * vlen);
printf("\n");
}
}
free(cov);
}
/* pair adjustment positioning */
static void otf_gpostype2(struct otf *otf, void *sub, char *feat)
{
int fmt = U16(sub, 0);
int vfmt1 = U16(sub, 4); /* valuerecord 1 */
int vfmt2 = U16(sub, 6); /* valuerecord 2 */
int fmtoff1, fmtoff2;
int vrlen; /* the length of vfmt1 and vfmt2 */
int i, j;
vrlen = valuerecord_len(vfmt1) + valuerecord_len(vfmt2);
if (fmt == 1) {
int nc1 = U16(sub, 8);
int *cov = coverage(sub + U16(sub, 2), NULL);
for (i = 0; i < nc1; i++) {
void *c2 = sub + U16(sub, 10 + 2 * i);
int nc2 = U16(c2, 0);
for (j = 0; j < nc2; j++) {
int second = U16(c2 + 2 + (2 + vrlen) * j, 0);
fmtoff1 = 2 + (2 + vrlen) * j + 2;
fmtoff2 = fmtoff1 + valuerecord_len(vfmt1);
if (valuerecord_small(vfmt1, c2 + fmtoff1) &&
valuerecord_small(vfmt2, c2 + fmtoff2))
continue;
printf("gpos %s 2", feat);
printf(" %s", glyph_name[cov[i]]);
valuerecord_print(vfmt1, c2 + fmtoff1);
printf(" %s", glyph_name[second]);
valuerecord_print(vfmt2, c2 + fmtoff2);
printf("\n");
}
}
free(cov);
}
if (fmt == 2) {
static int gl1[NGLYPHS], gl2[NGLYPHS];
static int cls1[NGLYPHS], cls2[NGLYPHS];
static int grp1[NGLYPHS], grp2[NGLYPHS];
int ngl1 = classdef(sub + U16(sub, 8), gl1, cls1);
int ngl2 = classdef(sub + U16(sub, 10), gl2, cls2);
int ncls1 = U16(sub, 12);
int ncls2 = U16(sub, 14);
for (i = 0; i < ncls1; i++)
grp1[i] = ggrp_class(gl1, cls1, ngl1, i);
for (i = 0; i < ncls2; i++)
grp2[i] = ggrp_class(gl2, cls2, ngl2, i);
for (i = 0; i < ncls1; i++) {
for (j = 0; j < ncls2; j++) {
fmtoff1 = 16 + (i * ncls2 + j) * vrlen;
fmtoff2 = fmtoff1 + valuerecord_len(vfmt1);
if (valuerecord_small(vfmt1, sub + fmtoff1) &&
valuerecord_small(vfmt2, sub + fmtoff2))
continue;
printf("gpos %s %d", feat, 2);
printf(" @%d", grp1[i]);
valuerecord_print(vfmt1, sub + fmtoff1);
printf(" @%d", grp2[j]);
valuerecord_print(vfmt2, sub + fmtoff2);
printf("\n");
}
}
}
}
/* cursive attachment positioning */
static void otf_gpostype3(struct otf *otf, void *sub, char *feat)
{
int fmt = U16(sub, 0);
int *cov, *icov, *ocov;
int i, n;
int icnt = 0;
int ocnt = 0;
int igrp, ogrp;
if (fmt != 1)
return;
cov = coverage(sub + U16(sub, 2), NULL);
n = U16(sub, 4);
icov = malloc(n * sizeof(icov[0]));
ocov = malloc(n * sizeof(ocov[0]));
for (i = 0; i < n; i++)
if (U16(sub, 6 + 4 * i))
ocov[ocnt++] = cov[i];
for (i = 0; i < n; i++)
if (U16(sub, 6 + 4 * i + 2))
icov[icnt++] = cov[i];
igrp = ggrp_coverage(icov, icnt);
ogrp = ggrp_coverage(ocov, ocnt);
free(icov);
free(ocov);
for (i = 0; i < n; i++) {
int prev = U16(sub, 6 + 4 * i);
int next = U16(sub, 6 + 4 * i + 2);
if (prev) {
int dx = -uwid(S16(sub, prev + 2));
int dy = -uwid(S16(sub, prev + 4));
if (otf_r2l(feat))
dx += uwid(glyph_wid[cov[i]]);
printf("gpos %s 2 @%d %s:%+d%+d%+d%+d\n",
feat, igrp, glyph_name[cov[i]],
0, 0, dx, dy);
}
if (next) {
int dx = uwid(S16(sub, next + 2)) - uwid(glyph_wid[cov[i]]);
int dy = uwid(S16(sub, next + 4));
if (otf_r2l(feat)) {
dx += uwid(glyph_wid[cov[i]]);
}
printf("gpos %s 2 %s @%d:%+d%+d%+d%+d\n",
feat, glyph_name[cov[i]], ogrp,
0, 0, dx, dy);
}
}
free(cov);
}
/* mark-to-base attachment positioning */
static void otf_gpostype4(struct otf *otf, void *sub, char *feat)
{
int fmt = U16(sub, 0);
int *mcov; /* mark coverage */
int *bcov; /* base coverage */
int cgrp[1024]; /* glyph groups assigned to classes */
int bgrp; /* the group assigned to base glyphs */
int mcnt; /* mark coverage size */
int bcnt; /* base coverage size */
int ccnt; /* class count */
void *marks; /* mark array table */
void *bases; /* base array table */
int i, j;
if (fmt != 1)
return;
mcov = coverage(sub + U16(sub, 2), &mcnt);
bcov = coverage(sub + U16(sub, 4), &bcnt);
ccnt = U16(sub, 6);
marks = sub + U16(sub, 8);
bases = sub + U16(sub, 10);
bgrp = ggrp_coverage(bcov, bcnt);
for (i = 0; i < ccnt; i++) {
int *grp = malloc(mcnt * sizeof(grp[0]));
int cnt = 0;
for (j = 0; j < mcnt; j++)
if (U16(marks, 2 + 4 * j) == i)
grp[cnt++] = mcov[j];
cgrp[i] = ggrp_coverage(grp, cnt);
free(grp);
}
for (i = 0; i < mcnt; i++) {
void *mark = marks + U16(marks, 2 + 4 * i + 2); /* mark anchor */
int dx = -uwid(S16(mark, 2));
int dy = -uwid(S16(mark, 4));
if (otf_r2l(feat)) {
dx += uwid(glyph_wid[mcov[i]]);
dy = -dy;
}
printf("gpos %s 2 @%d %s:%+d%+d%+d%+d\n",
feat, bgrp, glyph_name[mcov[i]], dx, dy, 0, 0);
}
for (i = 0; i < bcnt; i++) {
for (j = 0; j < ccnt; j++) {
void *base = bases + U16(bases, 2 + ccnt * 2 * i + 2 * j);
int dx = uwid(S16(base, 2)) - uwid(glyph_wid[bcov[i]]);
int dy = uwid(S16(base, 4));
if (otf_r2l(feat)) {
dx += uwid(glyph_wid[bcov[i]]);
dy = -dy;
}
printf("gpos %s 2 %s @%d:%+d%+d%+d%+d\n",
feat, glyph_name[bcov[i]], cgrp[j], dx, dy, 0, 0);
}
}
free(mcov);
free(bcov);
}
/* gsub context */
struct gctx {
int bgrp[GCTXLEN]; /* backtrack coverage arrays */
int igrp[GCTXLEN]; /* input coverage arrays */
int lgrp[GCTXLEN]; /* lookahead coverage arrays*/
int bn, in, ln; /* size of b[], i[], l[] */
int seqidx; /* sequence index */
};
static int gctx_len(struct gctx *ctx, int patlen)
{
return ctx ? ctx->bn + ctx->in + ctx->ln - patlen : 0;
}
static void gctx_backtrack(struct gctx *ctx)
{
int i;
if (!ctx)
return;
for (i = 0; i < ctx->bn; i++)
printf(" =@%d", ctx->bgrp[i]);
for (i = 0; i < ctx->seqidx; i++)
printf(" =@%d", ctx->igrp[i]);
}
static void gctx_lookahead(struct gctx *ctx, int patlen)
{
int i;
if (!ctx)
return;
for (i = ctx->seqidx + patlen; i < ctx->in; i++)
printf(" =@%d", ctx->igrp[i]);
for (i = 0; i < ctx->ln; i++)
printf(" =@%d", ctx->lgrp[i]);
}
/* single substitution */
static void otf_gsubtype1(struct otf *otf, void *sub, char *feat, struct gctx *ctx)
{
int *cov;
int fmt = U16(sub, 0);
int ncov;
int i;
cov = coverage(sub + U16(sub, 2), &ncov);
if (fmt == 1) {
for (i = 0; i < ncov; i++) {
int dst = cov[i] + S16(sub, 4);
if (dst >= glyph_n || dst < 0)
continue;
printf("gsub %s %d", feat, 2 + gctx_len(ctx, 1));
gctx_backtrack(ctx);
printf(" -%s +%s", glyph_name[cov[i]], glyph_name[dst]);
gctx_lookahead(ctx, 1);
printf("\n");
}
}
if (fmt == 2) {
int n = U16(sub, 4);
for (i = 0; i < n; i++) {
printf("gsub %s %d", feat, 2 + gctx_len(ctx, 1));
gctx_backtrack(ctx);
printf(" -%s +%s", glyph_name[cov[i]],
glyph_name[U16(sub, 6 + 2 * i)]);
gctx_lookahead(ctx, 1);
printf("\n");
}
}
free(cov);
}
/* alternate substitution */
static void otf_gsubtype3(struct otf *otf, void *sub, char *feat, struct gctx *ctx)
{
int *cov;
int fmt = U16(sub, 0);
int n, i, j;
if (fmt != 1)
return;
cov = coverage(sub + U16(sub, 2), NULL);
n = U16(sub, 4);
for (i = 0; i < n; i++) {
void *alt = sub + U16(sub, 6 + 2 * i);
int nalt = U16(alt, 0);
for (j = 0; j < nalt; j++) {
printf("gsub %s %d", feat, 2 + gctx_len(ctx, 1));
gctx_backtrack(ctx);
printf(" -%s +%s", glyph_name[cov[i]],
glyph_name[U16(alt, 2 + 2 * j)]);
gctx_lookahead(ctx, 1);
printf("\n");
}
}
free(cov);
}
/* ligature substitution */
static void otf_gsubtype4(struct otf *otf, void *sub, char *feat, struct gctx *ctx)
{
int fmt = U16(sub, 0);
int *cov;
int n, i, j, k;
if (fmt != 1)
return;
cov = coverage(sub + U16(sub, 2), NULL);
n = U16(sub, 4);
for (i = 0; i < n; i++) {
void *set = sub + U16(sub, 6 + 2 * i);
int nset = U16(set, 0);
for (j = 0; j < nset; j++) {
void *lig = set + U16(set, 2 + 2 * j);
int nlig = U16(lig, 2);
printf("gsub %s %d", feat, nlig + 1 + gctx_len(ctx, nlig));
gctx_backtrack(ctx);
printf(" -%s", glyph_name[cov[i]]);
for (k = 0; k < nlig - 1; k++)
printf(" -%s", glyph_name[U16(lig, 4 + 2 * k)]);
printf(" +%s", glyph_name[U16(lig, 0)]);
gctx_lookahead(ctx, nlig);
printf("\n");
}
}
free(cov);
}
/* chaining contextual substitution */
static void otf_gsubtype6(struct otf *otf, void *sub, char *feat, void *gsub)
{
struct gctx ctx = {{0}};
void *lookups = gsub + U16(gsub, 8);
int fmt = U16(sub, 0);
int *cov;
int i, j, nsub, ncov;
int off = 2;
if (fmt != 3) {
otf_unsupported("GSUB", 6, fmt);
return;
}
ctx.bn = U16(sub, off);
for (i = 0; i < ctx.bn; i++) {
cov = coverage(sub + U16(sub, off + 2 + 2 * i), &ncov);
ctx.bgrp[i] = ggrp_coverage(cov, ncov);
free(cov);
}
off += 2 + 2 * ctx.bn;
ctx.in = U16(sub, off);
for (i = 0; i < ctx.in; i++) {
cov = coverage(sub + U16(sub, off + 2 + 2 * i), &ncov);
ctx.igrp[i] = ggrp_coverage(cov, ncov);
free(cov);
}
off += 2 + 2 * ctx.in;
ctx.ln = U16(sub, off);
for (i = 0; i < ctx.ln; i ++) {
cov = coverage(sub + U16(sub, off + 2 + 2 * i), &ncov);
ctx.lgrp[i] = ggrp_coverage(cov, ncov);
free(cov);
}
off += 2 + 2 * ctx.ln;
nsub = U16(sub, off); /* nsub > 1 is not supported */
for (i = 0; i < nsub && i < 1; i++) {
int lidx = U16(sub, off + 2 + 4 * i + 2);
void *lookup = lookups + U16(lookups, 2 + 2 * lidx);
int ltype = U16(lookup, 0);
int ntabs = U16(lookup, 4);
ctx.seqidx = U16(sub, off + 2 + 4 * i);
for (j = 0; j < ntabs; j++) {
void *tab = lookup + U16(lookup, 6 + 2 * j);
int type = ltype;
if (type == 7) { /* extension substitution */
type = U16(tab, 2);
tab = tab + U32(tab, 4);
}
if (type == 1)
otf_gsubtype1(otf, tab, feat, &ctx);
if (type == 3)
otf_gsubtype3(otf, tab, feat, &ctx);
if (type == 4)
otf_gsubtype4(otf, tab, feat, &ctx);
}
}
}
/* an otf gsub/gpos lookup */
struct otflookup {
char scrp[8]; /* script name */
char lang[8]; /* language name */
char feat[8]; /* feature name */
int lookup; /* index into the lookup table */
};
/* parse the given gsub/gpos feature table */
static int otf_featrec(struct otf *otf, void *gtab, void *featrec,
char *stag, char *ltag,
struct otflookup *lookups, int lookups_n)
{
void *feats = gtab + U16(gtab, 6);
void *feat = feats + U16(featrec, 4);
int n = U16(feat, 2);
int i, j;
for (i = 0; i < n; i++) {
int lookup = U16(feat, 4 + 2 * i); /* lookup index */
/* do not store features common to all languages in a script */
for (j = 0; j < lookups_n; j++)
if (lookups[j].lookup == lookup && !lookups[j].lang[0])
if (!strcmp(lookups[j].scrp, stag))
break;
if (j == lookups_n) {
memcpy(lookups[j].feat, featrec, 4);
lookups[j].feat[4] = '\0';
strcpy(lookups[j].scrp, stag);
strcpy(lookups[j].lang, ltag);
lookups[j].lookup = U16(feat, 4 + 2 * i);
lookups_n++;
}
}
return lookups_n;
}
/* parse the given language table and its feature tables */
static int otf_lang(struct otf *otf, void *gtab, void *lang, char *stag, char *ltag,
struct otflookup *lookups, int lookups_n)
{
void *feats = gtab + U16(gtab, 6);
int featidx = U16(lang, 2);
int nfeat = U16(lang, 4);
int i;
if (featidx != 0xffff)
lookups_n = otf_featrec(otf, gtab, feats + 2 + 6 * featidx,
stag, ltag, lookups, lookups_n);
for (i = 0; i < nfeat; i++)
lookups_n = otf_featrec(otf, gtab, feats + 2 + 6 * U16(lang, 6 + 2 * i),
stag, ltag, lookups, lookups_n);
return lookups_n;
}
/* return lookup table tag (i.e. liga:latn:ENG); returns a static buffer */
static char *lookuptag(struct otflookup *lu)
{
static char tag[16];
sprintf(tag, "%s:%s", lu->feat, lu->scrp[0] ? lu->scrp : "DFLT");
if (lu->lang[0])
sprintf(strchr(tag, '\0'), ":%s", lu->lang);
return tag;
}
static int lookupcmp(void *v1, void *v2)
{
struct otflookup *l1 = v1;
struct otflookup *l2 = v2;
if (strcmp(l1->scrp, l2->scrp))
return strcmp(l1->scrp, l2->scrp);
if (mkfn_featrank(l1->scrp, l1->feat) != mkfn_featrank(l1->scrp, l2->feat))
return mkfn_featrank(l1->scrp, l1->feat) - mkfn_featrank(l1->scrp, l2->feat);
return l1->lookup - l2->lookup;
}
/* extract lookup tables for all features of the given gsub/gpos table */
static int otf_gtab(struct otf *otf, void *gpos, struct otflookup *lookups)
{
void *scripts = gpos + U16(gpos, 4);
int nscripts, nlangs;
void *script;
char stag[8], ltag[8]; /* script and language tags */
int i, j;
int n = 0;
nscripts = U16(scripts, 0);
for (i = 0; i < nscripts; i++) {
void *grec = scripts + 2 + 6 * i;
memcpy(stag, grec, 4);
stag[4] = '\0';
if (!mkfn_script(stag, nscripts))
continue;
script = scripts + U16(grec, 4);
nlangs = U16(script, 2);
if (U16(script, 0) && mkfn_lang(NULL, nlangs + (U16(script, 0) != 0)))
n = otf_lang(otf, gpos, script + U16(script, 0),
stag, "", lookups, n);
for (j = 0; j < nlangs; j++) {
void *lrec = script + 4 + 6 * j;
memcpy(ltag, lrec, 4);
ltag[4] = '\0';
if (mkfn_lang(ltag, nlangs + (U16(script, 0) != 0)))
n = otf_lang(otf, gpos, script + U16(lrec, 4),
stag, ltag, lookups, n);
}
}
qsort(lookups, n, sizeof(lookups[0]), (void *) lookupcmp);
return n;
}
static void otf_gpos(struct otf *otf, void *gpos)
{
struct otflookup lookups[NLOOKUPS];
void *lookuplist = gpos + U16(gpos, 8);
int nlookups = otf_gtab(otf, gpos, lookups);
int i, j;
if (mkfn_dry)
return;
for (i = 0; i < nlookups; i++) {
void *lookup = lookuplist + U16(lookuplist, 2 + 2 * lookups[i].lookup);
int ltype = U16(lookup, 0);
int ntabs = U16(lookup, 4);
char *tag = lookuptag(&lookups[i]);
printf("gsec %s\n", tag);
for (j = 0; j < ntabs; j++) {
void *tab = lookup + U16(lookup, 6 + 2 * j);
int type = ltype;
if (type == 9) { /* extension positioning */
type = U16(tab, 2);
tab = tab + U32(tab, 4);
}
switch (type) {
case 1:
otf_gpostype1(otf, tab, tag);
break;
case 2:
otf_gpostype2(otf, tab, tag);
break;
case 3:
otf_gpostype3(otf, tab, tag);
break;
case 4:
otf_gpostype4(otf, tab, tag);
break;
default:
otf_unsupported("GPOS", type, 0);
}
}
}
}
static void otf_gsub(struct otf *otf, void *gsub)
{
struct otflookup lookups[NLOOKUPS];
void *lookuplist = gsub + U16(gsub, 8);
int nlookups = otf_gtab(otf, gsub, lookups);
int i, j;
if (mkfn_dry)
return;
for (i = 0; i < nlookups; i++) {
void *lookup = lookuplist + U16(lookuplist, 2 + 2 * lookups[i].lookup);
int ltype = U16(lookup, 0);
int ntabs = U16(lookup, 4);
char *tag = lookuptag(&lookups[i]);
printf("gsec %s\n", tag);
for (j = 0; j < ntabs; j++) {
void *tab = lookup + U16(lookup, 6 + 2 * j);
int type = ltype;
if (type == 7) { /* extension substitution */
type = U16(tab, 2);
tab = tab + U32(tab, 4);
}
switch (type) {
case 1:
otf_gsubtype1(otf, tab, tag, NULL);
break;
case 3:
otf_gsubtype3(otf, tab, tag, NULL);
break;
case 4:
otf_gsubtype4(otf, tab, tag, NULL);
break;
case 6:
otf_gsubtype6(otf, tab, tag, gsub);
break;
default:
otf_unsupported("GSUB", type, 0);
}
}
}
}
/* read a cff offset, which has sz bytes */
static int cff_int(void *tab, int off, int sz)
{
int i;
int n = 0;
for (i = 0; i < sz; i++)
n = n * 256 + U8(tab, off + i);
return n;
}
/* cff dict operand/operator */
static int cff_op(void *tab, int off, int *val)
{
int b0 = U8(tab, off);
int i;
if (b0 >= 32 && b0 <= 246) {
*val = b0 - 139;
return 1;
}
if (b0 >= 247 && b0 <= 250) {
*val = (b0 - 247) * 256 + U8(tab, off + 1) + 108;
return 2;
}
if (b0 >= 251 && b0 <= 254) {
*val = -(b0 - 251) * 256 - U8(tab, off + 1) - 108;
return 2;
}
if (b0 == 28) {
*val = (U8(tab, off + 1) << 8) | U8(tab, off + 2);
return 3;
}
if (b0 == 29) {
*val = (U8(tab, off + 1) << 24) | (U8(tab, off + 2) << 16) |
(U8(tab, off + 3) << 8) | U8(tab, off + 4);
return 5;
}
if (b0 == 30) {
for (i = 1; i < 32; i++) {
int nib = U8(tab, off + i);
if ((nib & 0x0f) == 0x0f || (nib & 0xf0) == 0xf0)
break;
}
*val = 0;
return i + 1;
}
*val = b0;
return 1;
}
static int cffidx_cnt(void *idx)
{
return U16(idx, 0);
}
static void *cffidx_get(void *idx, int i)
{
int cnt = U16(idx, 0);
int sz = U8(idx, 2);
return idx + 3 + (cnt + 1) * sz - 1 + cff_int(idx, 3 + i * sz, sz);
}
static int cffidx_len(void *idx, int i)
{
return cffidx_get(idx, i + 1) - cffidx_get(idx, i);
}
static void *cffidx_end(void *idx)
{
return cffidx_get(idx, cffidx_cnt(idx));
}
/* obtain the value of the given key from a cff dict */
static int cffdict_get(void *dict, int len, int key, int *args)
{
int off = 0;
int op = 0;
int val = 0;
/* operators: keys (one or two bytes); operands: values */
while (off < len) {
val = op;
if (args) {
memmove(args + 1, args + 0, 3 * sizeof(args[0]));
args[0] = val;
}
off += cff_op(dict, off, &op);
if (op == 12) { /* two-byte operator */
off += cff_op(dict, off, &op);
op += 1200;
}
if (op == key)
return val;
}
return 0;
}
static void cff_char(void *stridx, int id, char *dst)
{
int len;
if (id < 391) {
strcpy(dst, stdset[id]);
return;
}
id -= 391;
len = cffidx_len(stridx, id);
if (len >= GNLEN)
len = GNLEN - 1;
memcpy(dst, cffidx_get(stridx, id), len);
dst[len] = '\0';
}
static void otf_cff(struct otf *otf, void *cff)
{
void *nameidx; /* name index */
void *topidx; /* top dict index */
void *stridx; /* string idx */
void *chridx; /* charstrings index */
void *charset; /* charset offset */
int badcff; /* invalid CFF SIDs */
int i, j;
if (U8(cff, 0) != 1)
return;
nameidx = cff + U8(cff, 2);
topidx = cffidx_end(nameidx);
if (cffidx_cnt(nameidx) < 1)
return;
stridx = cffidx_end(topidx);
chridx = cff + cffdict_get(cffidx_get(topidx, 0),
cffidx_len(topidx, 0), 17, NULL);
charset = cff + cffdict_get(cffidx_get(topidx, 0),
cffidx_len(topidx, 0), 15, NULL);
glyph_n = cffidx_cnt(chridx);
badcff = cffidx_cnt(chridx) - 391 > cffidx_cnt(stridx);
strcpy(glyph_name[0], ".notdef");
/* read font name from name index */
if (cffidx_cnt(nameidx) > 0) {
char name[256] = "";
memcpy(name, cffidx_get(nameidx, 0), cffidx_len(nameidx, 0));
if (name[0] && !otf->name[0])
snprintf(otf->name, sizeof(otf->name), "%s", name);
}
/* read charset: glyph to character name */
if (!badcff && U8(charset, 0) == 0) {
for (i = 0; i < glyph_n; i++)
cff_char(stridx, U16(charset, 1 + i * 2),
glyph_name[i + 1]);
}
if (!badcff && (U8(charset, 0) == 1 || U8(charset, 0) == 2)) {
int g = 1;
int sz = U8(charset, 0) == 1 ? 3 : 4;
for (i = 0; g < glyph_n; i++) {
int sid = U16(charset, 1 + i * sz);
int cnt = cff_int(charset, 1 + i * sz + 2, sz - 2);
for (j = 0; j <= cnt && g < glyph_n; j++) {
cff_char(stridx, sid + j, glyph_name[g]);
g++;
}
}
}
}
static void *otf_input(int fd)
{
struct sbuf *sb = sbuf_make();
char buf[1 << 12];
int nr = 0;
while ((nr = read(fd, buf, sizeof(buf))) > 0)
sbuf_mem(sb, buf, nr);
return sbuf_done(sb);
}
static void otf_feat(struct otf *otf)
{
if (otf_table(otf, "GSUB"))
otf_gsub(otf, otf_table(otf, "GSUB"));
if (otf_table(otf, "GPOS"))
otf_gpos(otf, otf_table(otf, "GPOS"));
}
int otf_offsettable(void *otf_otf, void *otf_off)
{
int i;
unsigned tag = U32(otf_off, 0);
struct otf otf_cur = {otf_otf, otf_off};
struct otf *otf = &otf_cur;
if (tag != 0x00010000 && tag != 0x4F54544F)
return 1;
upm = U16(otf_table(otf, "head"), 18);
otf_name(otf, otf_table(otf, "name"));
otf_cmap(otf, otf_table(otf, "cmap"));
otf_post(otf, otf_table(otf, "post"));
if (otf_table(otf, "glyf"))
otf_glyf(otf, otf_table(otf, "glyf"));
if (otf_table(otf, "CFF "))
otf_cff(otf, otf_table(otf, "CFF "));
for (i = 0; i < glyph_n; i++) {
if (!glyph_name[i][0]) {
if (glyph_code[i])
sprintf(glyph_name[i], "uni%04X", glyph_code[i]);
else
sprintf(glyph_name[i], "gl%05X", i);
}
}
otf_hmtx(otf, otf_table(otf, "hmtx"));
if (!mkfn_font(otf->name))
return 0;
for (i = 0; i < glyph_n; i++) {
mkfn_char(glyph_name[i], -1,
glyph_code[i] != 0xffff ? glyph_code[i] : 0,
uwid(glyph_wid[i]),
uwid(glyph_bbox[i][0]), uwid(glyph_bbox[i][1]),
uwid(glyph_bbox[i][2]), uwid(glyph_bbox[i][3]));
}
mkfn_header(otf->name);
if (otf_table(otf, "kern"))
otf_kern(otf, otf_table(otf, "kern"));
otf_feat(otf);
return 0;
}
int otf_read(void)
{
char *otf_buf = otf_input(0);
unsigned tag = U32(otf_buf, 0);
int n, i;
if (tag == 0x00010000 || tag == 0x4F54544F)
return otf_offsettable(otf_buf, otf_buf);
if (tag != 0x74746366)
return 1;
/* OpenType Collections */
n = U32(otf_buf, 8);
for (i = 0; i < n; i++) {
void *off = otf_buf + U32(otf_buf, 12 + i * 4);
otf_offsettable(otf_buf, off);
}
return 0;
}
/* glyph groups */
static int *ggrp_g[NGRPS];
static int ggrp_len[NGRPS];
static int ggrp_n;
static int ggrp_find(int *src, int n)
{
int i, j;
for (i = 0; i < ggrp_n; i++) {
if (ggrp_len[i] == n) {
for (j = 0; j < n; j++)
if (src[j] != ggrp_g[i][j])
break;
if (j == n)
return i;
}
}
return -1;
}
static int ggrp_make(int *src, int n)
{
int id = ggrp_find(src, n);
int i;
if (id >= 0)
return id;
id = ggrp_n++;
ggrp_g[id] = malloc(n * sizeof(ggrp_g[id][0]));
ggrp_len[id] = n;
for (i = 0; i < n; i++)
ggrp_g[id][i] = src[i];
printf("ggrp %d %d", id, n);
for (i = 0; i < n; i++)
printf(" %s", glyph_name[src[i]]);
printf("\n");
return id;
}
static char *macset[] = {
".notdef", ".null", "nonmarkingreturn", "space", "exclam",
"quotedbl", "numbersign", "dollar", "percent", "ampersand",
"quotesingle", "parenleft", "parenright", "asterisk", "plus",
"comma", "hyphen", "period", "slash", "zero",
"one", "two", "three", "four", "five",
"six", "seven", "eight", "nine", "colon",
"semicolon", "less", "equal", "greater", "question",
"at", "A", "B", "C", "D",
"E", "F", "G", "H", "I",
"J", "K", "L", "M", "N",
"O", "P", "Q", "R", "S",
"T", "U", "V", "W", "X",
"Y", "Z", "bracketleft", "backslash", "bracketright",
"asciicircum", "underscore", "grave", "a", "b",
"c", "d", "e", "f", "g",
"h", "i", "j", "k", "l",
"m", "n", "o", "p", "q",
"r", "s", "t", "u", "v",
"w", "x", "y", "z", "braceleft",
"bar", "braceright", "asciitilde", "Adieresis", "Aring",
"Ccedilla", "Eacute", "Ntilde", "Odieresis", "Udieresis",
"aacute", "agrave", "acircumflex", "adieresis", "atilde",
"aring", "ccedilla", "eacute", "egrave", "ecircumflex",
"edieresis", "iacute", "igrave", "icircumflex", "idieresis",
"ntilde", "oacute", "ograve", "ocircumflex", "odieresis",
"otilde", "uacute", "ugrave", "ucircumflex", "udieresis",
"dagger", "degree", "cent", "sterling", "section",
"bullet", "paragraph", "germandbls", "registered", "copyright",
"trademark", "acute", "dieresis", "notequal", "AE",
"Oslash", "infinity", "plusminus", "lessequal", "greaterequal",
"yen", "mu", "partialdiff", "summation", "product",
"pi", "integral", "ordfeminine", "ordmasculine", "Omega",
"ae", "oslash", "questiondown", "exclamdown", "logicalnot",
"radical", "florin", "approxequal", "Delta", "guillemotleft",
"guillemotright", "ellipsis", "nonbreakingspace", "Agrave", "Atilde",
"Otilde", "OE", "oe", "endash", "emdash",
"quotedblleft", "quotedblright", "quoteleft", "quoteright", "divide",
"lozenge", "ydieresis", "Ydieresis", "fraction", "currency",
"guilsinglleft", "guilsinglright", "fi", "fl", "daggerdbl",
"periodcentered", "quotesinglbase", "quotedblbase", "perthousand", "Acircumflex",
"Ecircumflex", "Aacute", "Edieresis", "Egrave", "Iacute",
"Icircumflex", "Idieresis", "Igrave", "Oacute", "Ocircumflex",
"apple", "Ograve", "Uacute", "Ucircumflex", "Ugrave",
"dotlessi", "circumflex", "tilde", "macron", "breve",
"dotaccent", "ring", "cedilla", "hungarumlaut", "ogonek",
"caron", "Lslash", "lslash", "Scaron", "scaron",
"Zcaron", "zcaron", "brokenbar", "Eth", "eth",
"Yacute", "yacute", "Thorn", "thorn", "minus",
"multiply", "onesuperior", "twosuperior", "threesuperior", "onehalf",
"onequarter", "threequarters", "franc", "Gbreve", "gbreve",
"Idotaccent", "Scedilla", "scedilla", "Cacute", "cacute",
"Ccaron", "ccaron", "dcroat",
};
static char *stdset[] = {
".notdef", "space", "exclam", "quotedbl", "numbersign",
"dollar", "percent", "ampersand", "quoteright", "parenleft",
"parenright", "asterisk", "plus", "comma", "hyphen",
"period", "slash", "zero", "one", "two",
"three", "four", "five", "six", "seven",
"eight", "nine", "colon", "semicolon", "less",
"equal", "greater", "question", "at", "A",
"B", "C", "D", "E", "F",
"G", "H", "I", "J", "K",
"L", "M", "N", "O", "P",
"Q", "R", "S", "T", "U",
"V", "W", "X", "Y", "Z",
"bracketleft", "backslash", "bracketright", "asciicircum", "underscore",
"quoteleft", "a", "b", "c", "d",
"e", "f", "g", "h", "i",
"j", "k", "l", "m", "n",
"o", "p", "q", "r", "s",
"t", "u", "v", "w", "x",
"y", "z", "braceleft", "bar", "braceright",
"asciitilde", "exclamdown", "cent", "sterling", "fraction",
"yen", "florin", "section", "currency", "quotesingle",
"quotedblleft", "guillemotleft", "guilsinglleft", "guilsinglright", "fi",
"fl", "endash", "dagger", "daggerdbl", "periodcentered",
"paragraph", "bullet", "quotesinglbase", "quotedblbase", "quotedblright",
"guillemotright", "ellipsis", "perthousand", "questiondown", "grave",
"acute", "circumflex", "tilde", "macron", "breve",
"dotaccent", "dieresis", "ring", "cedilla", "hungarumlaut",
"ogonek", "caron", "emdash", "AE", "ordfeminine",
"Lslash", "Oslash", "OE", "ordmasculine", "ae",
"dotlessi", "lslash", "oslash", "oe", "germandbls",
"onesuperior", "logicalnot", "mu", "trademark", "Eth",
"onehalf", "plusminus", "Thorn", "onequarter", "divide",
"brokenbar", "degree", "thorn", "threequarters", "twosuperior",
"registered", "minus", "eth", "multiply", "threesuperior",
"copyright", "Aacute", "Acircumflex", "Adieresis", "Agrave",
"Aring", "Atilde", "Ccedilla", "Eacute", "Ecircumflex",
"Edieresis", "Egrave", "Iacute", "Icircumflex", "Idieresis",
"Igrave", "Ntilde", "Oacute", "Ocircumflex", "Odieresis",
"Ograve", "Otilde", "Scaron", "Uacute", "Ucircumflex",
"Udieresis", "Ugrave", "Yacute", "Ydieresis", "Zcaron",
"aacute", "acircumflex", "adieresis", "agrave", "aring",
"atilde", "ccedilla", "eacute", "ecircumflex", "edieresis",
"egrave", "iacute", "icircumflex", "idieresis", "igrave",
"ntilde", "oacute", "ocircumflex", "odieresis", "ograve",
"otilde", "scaron", "uacute", "ucircumflex", "udieresis",
"ugrave", "yacute", "ydieresis", "zcaron", "exclamsmall",
"Hungarumlautsmall", "dollaroldstyle", "dollarsuperior", "ampersandsmall", "Acutesmall",
"parenleftsuperior", "parenrightsuperior", "twodotenleader", "onedotenleader", "zerooldstyle",
"oneoldstyle", "twooldstyle", "threeoldstyle", "fouroldstyle", "fiveoldstyle",
"sixoldstyle", "sevenoldstyle", "eightoldstyle", "nineoldstyle", "commasuperior",
"threequartersemdash", "periodsuperior", "questionsmall", "asuperior", "bsuperior",
"centsuperior", "dsuperior", "esuperior", "isuperior", "lsuperior",
"msuperior", "nsuperior", "osuperior", "rsuperior", "ssuperior",
"tsuperior", "ff", "ffi", "ffl", "parenleftinferior",
"parenrightinferior", "Circumflexsmall", "hyphensuperior", "Gravesmall", "Asmall",
"Bsmall", "Csmall", "Dsmall", "Esmall", "Fsmall",
"Gsmall", "Hsmall", "Ismall", "Jsmall", "Ksmall",
"Lsmall", "Msmall", "Nsmall", "Osmall", "Psmall",
"Qsmall", "Rsmall", "Ssmall", "Tsmall", "Usmall",
"Vsmall", "Wsmall", "Xsmall", "Ysmall", "Zsmall",
"colonmonetary", "onefitted", "rupiah", "Tildesmall", "exclamdownsmall",
"centoldstyle", "Lslashsmall", "Scaronsmall", "Zcaronsmall", "Dieresissmall",
"Brevesmall", "Caronsmall", "Dotaccentsmall", "Macronsmall", "figuredash",
"hypheninferior", "Ogoneksmall", "Ringsmall", "Cedillasmall", "questiondownsmall",
"oneeighth", "threeeighths", "fiveeighths", "seveneighths", "onethird",
"twothirds", "zerosuperior", "foursuperior", "fivesuperior", "sixsuperior",
"sevensuperior", "eightsuperior", "ninesuperior", "zeroinferior", "oneinferior",
"twoinferior", "threeinferior", "fourinferior", "fiveinferior", "sixinferior",
"seveninferior", "eightinferior", "nineinferior", "centinferior", "dollarinferior",
"periodinferior", "commainferior", "Agravesmall", "Aacutesmall", "Acircumflexsmall",
"Atildesmall", "Adieresissmall", "Aringsmall", "AEsmall", "Ccedillasmall",
"Egravesmall", "Eacutesmall", "Ecircumflexsmall", "Edieresissmall", "Igravesmall",
"Iacutesmall", "Icircumflexsmall", "Idieresissmall", "Ethsmall", "Ntildesmall",
"Ogravesmall", "Oacutesmall", "Ocircumflexsmall", "Otildesmall", "Odieresissmall",
"OEsmall", "Oslashsmall", "Ugravesmall", "Uacutesmall", "Ucircumflexsmall",
"Udieresissmall", "Yacutesmall", "Thornsmall", "Ydieresissmall", "001.000",
"001.001", "001.002", "001.003", "Black", "Bold",
"Book", "Light", "Medium", "Regular", "Roman",
"Semibold",
};