From 20503ccd578c9983162857954e3236413469ed35 Mon Sep 17 00:00:00 2001
From: Behdad Esfahbod <behdad@behdad.org>
Date: Tue, 7 Jun 2011 17:02:48 -0400
Subject: [PATCH] More Indic data shuffling

---
 src/hb-ot-shape-complex-indic.cc | 76 +++++++++++++++++++++-----------
 1 file changed, 51 insertions(+), 25 deletions(-)

diff --git a/src/hb-ot-shape-complex-indic.cc b/src/hb-ot-shape-complex-indic.cc
index 901c0e53b..62bea9a60 100644
--- a/src/hb-ot-shape-complex-indic.cc
+++ b/src/hb-ot-shape-complex-indic.cc
@@ -1,5 +1,5 @@
 /*
- * Copyright © 2010  Google, Inc.
+ * Copyright © 2011  Google, Inc.
  *
  *  This is part of HarfBuzz, a text shaping library.
  *
@@ -34,37 +34,60 @@ HB_BEGIN_DECLS
 
 #define INDIC_TABLE_ELEMENT_TYPE uint8_t
 
-enum indic_syllabic_category_t {
-  INDIC_SYLLABIC_CATEGORY_AVAGRAHA,
-  INDIC_SYLLABIC_CATEGORY_BINDU,
-  INDIC_SYLLABIC_CATEGORY_CONSONANT,
-  INDIC_SYLLABIC_CATEGORY_CONSONANT_DEAD,
-  INDIC_SYLLABIC_CATEGORY_CONSONANT_FINAL,
-  INDIC_SYLLABIC_CATEGORY_CONSONANT_HEAD_LETTER,
-  INDIC_SYLLABIC_CATEGORY_CONSONANT_MEDIAL,
-  INDIC_SYLLABIC_CATEGORY_CONSONANT_PLACEHOLDER,
-  INDIC_SYLLABIC_CATEGORY_CONSONANT_REPHA,
-  INDIC_SYLLABIC_CATEGORY_CONSONANT_SUBJOINED,
-  INDIC_SYLLABIC_CATEGORY_MODIFYING_LETTER,
-  INDIC_SYLLABIC_CATEGORY_NUKTA,
-  INDIC_SYLLABIC_CATEGORY_OTHER,
-  INDIC_SYLLABIC_CATEGORY_REGISTER_SHIFTER,
-  INDIC_SYLLABIC_CATEGORY_TONE_LETTER,
-  INDIC_SYLLABIC_CATEGORY_TONE_MARK,
-  INDIC_SYLLABIC_CATEGORY_VIRAMA,
-  INDIC_SYLLABIC_CATEGORY_VISARGA,
-  INDIC_SYLLABIC_CATEGORY_VOWEL,
-  INDIC_SYLLABIC_CATEGORY_VOWEL_DEPENDENT,
-  INDIC_SYLLABIC_CATEGORY_VOWEL_INDEPENDENT,
+/* Cateories used in the OpenType spec:
+ * https://www.microsoft.com/typography/otfntdev/devanot/shaping.aspx
+ */
+enum {
+  OT_X = 0,
+  OT_C,
+  OT_V,
+  OT_N,
+  OT_H,
+  OT_ZWNJ,
+  OT_ZWJ,
+  OT_M,
+  OT_SM,
+  OT_VD,
+  OT_A,
+  OT_NBSP,
 };
 
+/* Categories used in IndicSyllabicCategory.txt from UCD */
+/* The assignments are guesswork */
+enum indic_syllabic_category_t {
+  INDIC_SYLLABIC_CATEGORY_OTHER			= OT_X,
+
+  INDIC_SYLLABIC_CATEGORY_AVAGRAHA		= OT_SM,
+  INDIC_SYLLABIC_CATEGORY_BINDU			= OT_SM,
+  INDIC_SYLLABIC_CATEGORY_CONSONANT		= OT_C,
+  INDIC_SYLLABIC_CATEGORY_CONSONANT_DEAD	= OT_C,
+  INDIC_SYLLABIC_CATEGORY_CONSONANT_FINAL	= OT_C,
+  INDIC_SYLLABIC_CATEGORY_CONSONANT_HEAD_LETTER	= OT_C,
+  INDIC_SYLLABIC_CATEGORY_CONSONANT_MEDIAL	= OT_C,
+  INDIC_SYLLABIC_CATEGORY_CONSONANT_PLACEHOLDER	= OT_NBSP,
+  INDIC_SYLLABIC_CATEGORY_CONSONANT_SUBJOINED	= OT_C,
+  INDIC_SYLLABIC_CATEGORY_CONSONANT_REPHA	= OT_C,
+  INDIC_SYLLABIC_CATEGORY_MODIFYING_LETTER	= OT_SM,
+  INDIC_SYLLABIC_CATEGORY_NUKTA			= OT_N,
+  INDIC_SYLLABIC_CATEGORY_REGISTER_SHIFTER	= OT_SM,
+  INDIC_SYLLABIC_CATEGORY_TONE_LETTER		= OT_V,
+  INDIC_SYLLABIC_CATEGORY_TONE_MARK		= OT_M,
+  INDIC_SYLLABIC_CATEGORY_VIRAMA		= OT_H,
+  INDIC_SYLLABIC_CATEGORY_VISARGA		= OT_SM,
+  INDIC_SYLLABIC_CATEGORY_VOWEL			= OT_V,
+  INDIC_SYLLABIC_CATEGORY_VOWEL_DEPENDENT	= OT_M,
+  INDIC_SYLLABIC_CATEGORY_VOWEL_INDEPENDENT	= OT_V,
+};
+
+/* Categories used in IndicSMatraCategory.txt from UCD */
 enum indic_matra_category_t {
+  INDIC_MATRA_CATEGORY_NOT_APPLICABLE		= 0,
+
   INDIC_MATRA_CATEGORY_BOTTOM,
   INDIC_MATRA_CATEGORY_BOTTOM_AND_RIGHT,
   INDIC_MATRA_CATEGORY_INVISIBLE,
   INDIC_MATRA_CATEGORY_LEFT,
   INDIC_MATRA_CATEGORY_LEFT_AND_RIGHT,
-  INDIC_MATRA_CATEGORY_NOT_APPLICABLE,
   INDIC_MATRA_CATEGORY_OVERSTRUCK,
   INDIC_MATRA_CATEGORY_RIGHT,
   INDIC_MATRA_CATEGORY_TOP,
@@ -76,7 +99,10 @@ enum indic_matra_category_t {
   INDIC_MATRA_CATEGORY_VISUAL_ORDER_LEFT,
 };
 
-#define INDIC_COMBINE_CATEGORIES(S,M) (S)
+#define INDIC_COMBINE_CATEGORIES(S,M) \
+  (ASSERT_STATIC_EXPR (M == INDIC_MATRA_CATEGORY_NOT_APPLICABLE || (S == INDIC_SYLLABIC_CATEGORY_VIRAMA || S == INDIC_SYLLABIC_CATEGORY_VOWEL_DEPENDENT)), \
+   ASSERT_STATIC_EXPR (S < 16 && M < 16), \
+   (M << 4) | S)
 
 #include "hb-ot-shape-complex-indic-table.hh"