ref: 27fd6f2204e2990046efb20819ae2abac4de6d83
parent: 26b0c8143db78e9594fb9e6ac455e4a4218d704e
author: Ali Gholami Rudi <ali@rudi.ir>
date: Sat Dec 10 13:22:49 EST 2016
otf: mark-to-base attachment positioning GPOS subtable
--- a/otf.c
+++ b/otf.c
@@ -461,6 +461,54 @@
}
}
+/* mark-to-base attachment positioning */
+static void otf_gpostype4(void *otf, void *sub, char *feat)
+{+ int fmt = U16(sub, 0);
+ int mcov[NGLYPHS]; /* mark coverage */
+ int bcov[NGLYPHS]; /* 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;
+ mcnt = coverage(sub + U16(sub, 2), mcov);
+ bcnt = coverage(sub + U16(sub, 4), bcov);
+ 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[NGLYPHS];
+ 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);
+ }
+ 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));
+ 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));
+ int dy = -uwid(S16(base, 4));
+ printf("gpos %s 2 %s @%d:%+d%+d%+d%+d\n",+ feat, glyph_name[bcov[i]], cgrp[j], dx, dy, 0, 0);
+ }
+ }
+}
+
/* gsub context */
struct gctx {int bgrp[GCTXLEN]; /* backtrack coverage arrays */
@@ -740,6 +788,9 @@
break;
case 3:
otf_gpostype3(otf, tab, tag);
+ break;
+ case 4:
+ otf_gpostype4(otf, tab, tag);
break;
default:
otf_unsupported("GPOS", type, 0);