Initial attempt at Arabic shaping. Not sure if it'll work.

diff --git a/ttxt.c b/ttxt.c
index e02062874803dda632069a35b3fd30c825781b18..f658a2ef4f56df54581104eb7ced6f9292b2a2fe 100644 (file)
--- a/ttxt.c
+++ b/ttxt.c
@@ -101,7 +101,12 @@ struct glyph {
        int unicode;
        char const *name;
        unsigned char flags;
-#define SC             1 /* Character has a small-caps variant. */
+#define SC   1 /* Character has a small-caps variant. */
+#define A1   2 /* Arabic character with upwards tail. */
+#define A2   4 /* Arabic character with downwards tail. */
+#define A3   8 /* Arabic character with loopy tail. */
+#define AF  16 /* Arabic character with a dedicated final form. */
+#define AFI 32 /* Arabic character with a final/isolated from. */
 } glyphs[] = {
  /*
   * The first batch of glyphs comes from the code tables at the end of
@@ -367,33 +372,33 @@ struct glyph {
   */
  /* ASV-CODAR glyphs from Appendix 3 */
  {{001,001,001,001,001,001,000,000,000}, 0x0627 }, /* alef */
- {{000,000,000,001,001,077,000,004,000}, 0x0628 }, /* beh */
+ {{000,000,000,001,001,077,000,004,000}, 0x0628, 0, A1 }, /* beh */
  {{000,012,000,001,001,077,000,000,000}, 0x062a }, /* teh */
- {{004,012,000,001,001,077,000,000,000}, 0x062b }, /* theh */
- {{000,000,010,024,002,077,000,004,000}, 0x062c }, /* jeem */
- {{000,000,010,024,002,077,000,000,000}, 0x062d }, /* hah */
- {{004,000,010,024,002,077,000,000,000}, 0x062e }, /* khah */
- {{000,004,002,001,001,017,000,000,000}, 0x062f }, /* dal */
+ {{004,012,000,001,001,077,000,000,000}, 0x062b, 0, A1 }, /* theh */
+ {{000,000,010,024,002,077,000,004,000}, 0x062c, 0, A1 }, /* jeem */
+ {{000,000,010,024,002,077,000,000,000}, 0x062d, 0, A2 }, /* hah */
+ {{004,000,010,024,002,077,000,000,000}, 0x062e, 0, A2 }, /* khah */
+ {{000,004,002,001,001,017,000,000,000}, 0x062f, 0, A2 }, /* dal */
  {{001,004,002,001,001,017,000,000,000}, 0x0630 }, /* thal */
  {{000,000,000,001,001,001,002,004,010}, 0x0631 }, /* ra */
  {{000,004,000,001,001,001,002,004,010}, 0x0632 }, /* zain */
- {{000,000,000,025,025,077,000,000,000}, 0x0633 }, /* seen */
- {{004,012,000,025,025,077,000,000,000}, 0x0634 }, /* sheen */
- {{000,000,000,007,011,077,000,000,000}, 0x0635 }, /* sad */
- {{000,004,000,007,011,077,000,000,000}, 0x0636 }, /* dad */
+ {{000,000,000,025,025,077,000,000,000}, 0x0633, 0, A3 }, /* seen */
+ {{004,012,000,025,025,077,000,000,000}, 0x0634, 0, A3 }, /* sheen */
+ {{000,000,000,007,011,077,000,000,000}, 0x0635, 0, A3 }, /* sad */
+ {{000,004,000,007,011,077,000,000,000}, 0x0636, 0, A3 }, /* dad */
  {{010,010,010,017,011,077,000,000,000}, 0x0637 }, /* tah */
  {{010,012,010,017,011,077,000,000,000}, 0x0638 }, /* zah */
- {{000,000,006,010,010,077,000,000,000}, 0x0639 }, /* ain */
- {{004,000,006,010,010,077,000,000,000}, 0x063a }, /* ghain */
- {{002,000,002,005,003,077,000,000,000}, 0x0641 }, /* feh */
- {{012,000,002,005,003,077,000,000,000}, 0x0642 }, /* qaf */
- {{001,002,004,016,001,077,000,000,000}, 0x0643 }, /* kaf */
- {{001,001,001,001,001,077,000,000,000}, 0x0644 }, /* lam */
- {{000,000,000,000,006,071,006,000,000}, 0x0645 }, /* meem */
- {{000,004,000,001,001,077,000,000,000}, 0x0646 }, /* noon */
- {{000,006,001,015,013,077,000,000,000}, 0x0647 }, /* heh */
+ {{000,000,006,010,010,077,000,000,000}, 0x0639, 0, A2 }, /* ain */
+ {{004,000,006,010,010,077,000,000,000}, 0x063a, 0, A2 }, /* ghain */
+ {{002,000,002,005,003,077,000,000,000}, 0x0641, 0, A1 }, /* feh */
+ {{012,000,002,005,003,077,000,000,000}, 0x0642, 0, A1 }, /* qaf */
+ {{001,002,004,016,001,077,000,000,000}, 0x0643, 0, A1 }, /* kaf */
+ {{001,001,001,001,001,077,000,000,000}, 0x0644, 0, A1 }, /* lam */
+ {{000,000,000,000,006,071,006,000,000}, 0x0645, 0, A2 }, /* meem */
+ {{000,004,000,001,001,077,000,000,000}, 0x0646, 0, A1 }, /* noon */
+ {{000,006,001,015,013,077,000,000,000}, 0x0647, 0, AF }, /* heh */
  {{000,000,000,003,005,007,001,001,016}, 0x0648 }, /* waw */
- {{000,000,000,001,001,077,000,012,000}, 0x064a }, /* yeh */
+ {{000,000,000,001,001,077,000,012,000}, 0x064a, 0, AFI }, /* yeh */
  {{000,000,006,010,010,006,010,000,000}, 0x0621 }, /* hamza */
  {{000,000,000,003,025,025,034,000,012}, 0xfef2, "uni064A.fina" }, /* yeh */
  {{000,000,000,003,025,025,034,000,000}, 0x0649 }, /* alef maksura */
@@ -473,6 +478,11 @@ struct glyph {
  {{022,022,011,000,000,000,000,000,000}, 0x201f }, /* quotedblreversed */
  {{000,004,004,025,016,004,000,000,000}, 0x2193, "arrowdown" },
 
+ /* Arabic tails */
+ {{000,000,000,001,001,001,000,000,000}, -1, "tail1" },
+ {{000,000,000,000,000,001,002,002,001}, -1, "tail2" },
+ {{000,000,000,004,004,003,000,000,000}, -1, "tail3" },
+
  /* This is getting silly. */
  {{000,000,016,021,037,021,021,000,000}, -1, "a.sc" },
  {{000,000,036,021,036,021,036,000,000}, -1, "b.sc" },
@@ -539,6 +549,12 @@ main(int argc, char **argv)
            "['smcp' ('latn' <'dflt'>)]\n");
        printf("Lookup: 1 0 0 \"c2sc: upper-case to small caps\" {\"c2sc\"} "
            "['c2sc' ('latn' <'dflt'>)]\n");
+       printf("Lookup: 2 0 0 \"fina: Arabic tails\" {\"tails\"} "
+           "['fina' ('arab' <'dflt'>)]\n");
+       printf("Lookup: 1 0 0 \"fina: Arabic final form\" {\"fina\"} "
+           "['fina' ('arab' <'dflt'>)]\n");
+       printf("Lookup: 1 0 0 \"isol: Arabic isolated form\" {\"isol\"} "
+           "['isol' ('arab' <'dflt'>)]\n");
        printf("BeginChars: %d %d\n", 65536 + extraglyphs, nglyphs);
        extraglyphs = 0;
        for (i = 0; i < nglyphs; i++) {
@@ -559,6 +575,21 @@ main(int argc, char **argv)
                                "c2sc" : "smcp",
                            tolower((unsigned char)glyphs[i].name[0]),
                            glyphs[i].name + 1);
+               if ((glyphs[i].flags & A1))
+                       printf("MultipleSubs2: \"tails\" uni%04X tail1\n",
+                           (unsigned)glyphs[i].unicode);
+               if ((glyphs[i].flags & A2))
+                       printf("MultipleSubs2: \"tails\" uni%04X tail2\n",
+                           (unsigned)glyphs[i].unicode);
+               if ((glyphs[i].flags & A3))
+                       printf("MultipleSubs2: \"tails\" uni%04X tail3\n",
+                           (unsigned)glyphs[i].unicode);
+               if ((glyphs[i].flags & (AF|AFI)))
+                       printf("Substitution2: \"fina\" uni%04X.fina\n",
+                           (unsigned)glyphs[i].unicode);
+               if ((glyphs[i].flags & AFI))
+                       printf("Substitution2: \"isol\" uni%04X.fina\n",
+                           (unsigned)glyphs[i].unicode);
                dochar(glyphs[i].data);
                printf("EndChar\n");
        }