Roll harfbuzz-ng 3b8fd9c48f4bde368bf2d465c148b9743a9216ee

third_party/harfbuzz-ng/src/hb-ot-shape-complex-indic-private.hh

+/*
+ * Copyright © 2012  Google, Inc.
+ *
+ *  This is part of HarfBuzz, a text shaping library.
+ *
+ * Permission is hereby granted, without written agreement and without
+ * license or royalty fees, to use, copy, modify, and distribute this
+ * software and its documentation for any purpose, provided that the
+ * above copyright notice and the following two paragraphs appear in
+ * all copies of this software.
+ *
+ * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
+ * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
+ * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
+ * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
+ * DAMAGE.
+ *
+ * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
+ * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
+ * FITNESS FOR A PARTICULAR PURPOSE.  THE SOFTWARE PROVIDED HEREUNDER IS
+ * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
+ * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
+ *
+ * Google Author(s): Behdad Esfahbod
+ */
+
+#ifndef HB_OT_SHAPE_COMPLEX_INDIC_PRIVATE_HH
+#define HB_OT_SHAPE_COMPLEX_INDIC_PRIVATE_HH
+
+#include "hb-private.hh"
+
+
+#include "hb-ot-shape-complex-private.hh"
+
+
+/* buffer var allocations */
+#define indic_category() complex_var_persistent_u8_0() /* indic_category_t */
+#define indic_position() complex_var_persistent_u8_1() /* indic_matra_category_t */
+
+#define INDIC_TABLE_ELEMENT_TYPE uint8_t
+
+/* Cateories used in the OpenType spec:
+ * https://www.microsoft.com/typography/otfntdev/devanot/shaping.aspx
+ */
+/* Note: This enum is duplicated in the -machine.rl source file.
+ * Not sure how to avoid duplication. */
+enum indic_category_t {
+  OT_X = 0,
+  OT_C,
+  OT_Ra, /* Not explicitly listed in the OT spec, but used in the grammar. */
+  OT_V,
+  OT_N,
+  OT_H,
+  OT_ZWNJ,
+  OT_ZWJ,
+  OT_M,
+  OT_SM,
+  OT_VD,
+  OT_A,
+  OT_NBSP,
+  OT_DOTTEDCIRCLE /* Not in the spec, but special in Uniscribe. /Very very/ special! */
+};
+
+/* Visual positions in a syllable from left to right. */
+enum indic_position_t {
+  POS_RA_TO_BECOME_REPH,
+  POS_PRE_M,
+  POS_PRE_C,
+  POS_BASE_C,
+  POS_ABOVE_C,
+  POS_BELOW_C,
+  POS_ABOVE_M,
+  POS_BELOW_M,
+  POS_POST_C,
+  POS_POST_M,
+  POS_SMVD
+};
+
+/* Categories used in IndicSyllabicCategory.txt from UCD. */
+enum indic_syllabic_category_t {
+  INDIC_SYLLABIC_CATEGORY_OTHER                 = OT_X,
+
+  INDIC_SYLLABIC_CATEGORY_AVAGRAHA              = OT_X,
+  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_X,
+  INDIC_SYLLABIC_CATEGORY_NUKTA                 = OT_N,
+  INDIC_SYLLABIC_CATEGORY_REGISTER_SHIFTER      = OT_X,
+  INDIC_SYLLABIC_CATEGORY_TONE_LETTER           = OT_X,
+  INDIC_SYLLABIC_CATEGORY_TONE_MARK             = OT_X,
+  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           = POS_BASE_C,
+
+  INDIC_MATRA_CATEGORY_LEFT                     = POS_PRE_M,
+  INDIC_MATRA_CATEGORY_TOP                      = POS_ABOVE_M,
+  INDIC_MATRA_CATEGORY_BOTTOM                   = POS_BELOW_M,
+  INDIC_MATRA_CATEGORY_RIGHT                    = POS_POST_M,
+
+  /* We don't really care much about these since we decompose them
+   * in the generic pre-shaping layer.  They will only be used if
+   * the font does not cover the decomposition.  In which case, we
+   * define these as aliases to the place we want the split-matra
+   * glyph to show up.  Quite arbitrary.
+   *
+   * TODO: There are some split matras without Unicode decompositions.
+   * We have to figure out what to do with them.
+   */
+  INDIC_MATRA_CATEGORY_BOTTOM_AND_RIGHT         = POS_POST_M,
+  INDIC_MATRA_CATEGORY_LEFT_AND_RIGHT           = POS_PRE_M,
+  INDIC_MATRA_CATEGORY_TOP_AND_BOTTOM           = POS_BELOW_M,
+  INDIC_MATRA_CATEGORY_TOP_AND_BOTTOM_AND_RIGHT = POS_POST_M,
+  INDIC_MATRA_CATEGORY_TOP_AND_LEFT             = POS_PRE_M,
+  INDIC_MATRA_CATEGORY_TOP_AND_LEFT_AND_RIGHT   = POS_PRE_M,
+  INDIC_MATRA_CATEGORY_TOP_AND_RIGHT            = POS_POST_M,
+
+  INDIC_MATRA_CATEGORY_INVISIBLE                = INDIC_MATRA_CATEGORY_NOT_APPLICABLE,
+  INDIC_MATRA_CATEGORY_OVERSTRUCK               = INDIC_MATRA_CATEGORY_NOT_APPLICABLE,
+  INDIC_MATRA_CATEGORY_VISUAL_ORDER_LEFT        = INDIC_MATRA_CATEGORY_NOT_APPLICABLE
+};
+
+/* Note: We use ASSERT_STATIC_EXPR_ZERO() instead of ASSERT_STATIC_EXPR() and the comma operation
+ * because gcc fails to optimize the latter and fills the table in at runtime. */
+#define INDIC_COMBINE_CATEGORIES(S,M) \
+  (ASSERT_STATIC_EXPR_ZERO (M == INDIC_MATRA_CATEGORY_NOT_APPLICABLE || (S == INDIC_SYLLABIC_CATEGORY_VIRAMA || S == INDIC_SYLLABIC_CATEGORY_VOWEL_DEPENDENT)) + \
+   ASSERT_STATIC_EXPR_ZERO (S < 16 && M < 16) + \
+   ((M << 4) | S))
+
+
+#include "hb-ot-shape-complex-indic-table.hh"
+
+/* XXX
+ * This is a hack for now.  We should:
+ * 1. Move this data into the main Indic table,
+ * and/or
+ * 2. Probe font lookups to determine consonant positions.
+ */
+static const struct consonant_position_t {
+  hb_codepoint_t u;
+  indic_position_t position;
+} consonant_positions[] = {
+  {0x0930, POS_BELOW_C},
+  {0x09AC, POS_BELOW_C},
+  {0x09AF, POS_POST_C},
+  {0x09B0, POS_BELOW_C},
+  {0x09F0, POS_BELOW_C},
+  {0x0A2F, POS_POST_C},
+  {0x0A30, POS_BELOW_C},
+  {0x0A35, POS_BELOW_C},
+  {0x0A39, POS_BELOW_C},
+  {0x0AB0, POS_BELOW_C},
+  {0x0B24, POS_BELOW_C},
+  {0x0B28, POS_BELOW_C},
+  {0x0B2C, POS_BELOW_C},
+  {0x0B2D, POS_BELOW_C},
+  {0x0B2E, POS_BELOW_C},
+  {0x0B2F, POS_POST_C},
+  {0x0B30, POS_BELOW_C},
+  {0x0B32, POS_BELOW_C},
+  {0x0B33, POS_BELOW_C},
+  {0x0B5F, POS_POST_C},
+  {0x0B71, POS_BELOW_C},
+  {0x0C15, POS_BELOW_C},
+  {0x0C16, POS_BELOW_C},
+  {0x0C17, POS_BELOW_C},
+  {0x0C18, POS_BELOW_C},
+  {0x0C19, POS_BELOW_C},
+  {0x0C1A, POS_BELOW_C},
+  {0x0C1B, POS_BELOW_C},
+  {0x0C1C, POS_BELOW_C},
+  {0x0C1D, POS_BELOW_C},
+  {0x0C1E, POS_BELOW_C},
+  {0x0C1F, POS_BELOW_C},
+  {0x0C20, POS_BELOW_C},
+  {0x0C21, POS_BELOW_C},
+  {0x0C22, POS_BELOW_C},
+  {0x0C23, POS_BELOW_C},
+  {0x0C24, POS_BELOW_C},
+  {0x0C25, POS_BELOW_C},
+  {0x0C26, POS_BELOW_C},
+  {0x0C27, POS_BELOW_C},
+  {0x0C28, POS_BELOW_C},
+  {0x0C2A, POS_BELOW_C},
+  {0x0C2B, POS_BELOW_C},
+  {0x0C2C, POS_BELOW_C},
+  {0x0C2D, POS_BELOW_C},
+  {0x0C2E, POS_BELOW_C},
+  {0x0C2F, POS_BELOW_C},
+  {0x0C30, POS_BELOW_C},
+  {0x0C32, POS_BELOW_C},
+  {0x0C33, POS_BELOW_C},
+  {0x0C35, POS_BELOW_C},
+  {0x0C36, POS_BELOW_C},
+  {0x0C37, POS_BELOW_C},
+  {0x0C38, POS_BELOW_C},
+  {0x0C39, POS_BELOW_C},
+  {0x0C95, POS_BELOW_C},
+  {0x0C96, POS_BELOW_C},
+  {0x0C97, POS_BELOW_C},
+  {0x0C98, POS_BELOW_C},
+  {0x0C99, POS_BELOW_C},
+  {0x0C9A, POS_BELOW_C},
+  {0x0C9B, POS_BELOW_C},
+  {0x0C9C, POS_BELOW_C},
+  {0x0C9D, POS_BELOW_C},
+  {0x0C9E, POS_BELOW_C},
+  {0x0C9F, POS_BELOW_C},
+  {0x0CA0, POS_BELOW_C},
+  {0x0CA1, POS_BELOW_C},
+  {0x0CA2, POS_BELOW_C},
+  {0x0CA3, POS_BELOW_C},
+  {0x0CA4, POS_BELOW_C},
+  {0x0CA5, POS_BELOW_C},
+  {0x0CA6, POS_BELOW_C},
+  {0x0CA7, POS_BELOW_C},
+  {0x0CA8, POS_BELOW_C},
+  {0x0CAA, POS_BELOW_C},
+  {0x0CAB, POS_BELOW_C},
+  {0x0CAC, POS_BELOW_C},
+  {0x0CAD, POS_BELOW_C},
+  {0x0CAE, POS_BELOW_C},
+  {0x0CAF, POS_BELOW_C},
+  {0x0CB0, POS_BELOW_C},
+  {0x0CB2, POS_BELOW_C},
+  {0x0CB3, POS_BELOW_C},
+  {0x0CB5, POS_BELOW_C},
+  {0x0CB6, POS_BELOW_C},
+  {0x0CB7, POS_BELOW_C},
+  {0x0CB8, POS_BELOW_C},
+  {0x0CB9, POS_BELOW_C},
+  {0x0CDE, POS_BELOW_C},
+  {0x0D2F, POS_POST_C},
+  {0x0D30, POS_POST_C},
+  {0x0D32, POS_BELOW_C},
+  {0x0D35, POS_POST_C},
+};
+
+/* XXX
+ * This is a hack for now.  We should move this data into the main Indic table.
+ * Or completely remove it and just check in the tables.
+ */
+static const hb_codepoint_t ra_chars[] = {
+  0x0930, /* Devanagari */
+  0x09B0, /* Bengali */
+  0x09F0, /* Bengali */
+  0x0A30, /* Gurmukhi */        /* No Reph */
+  0x0AB0, /* Gujarati */
+  0x0B30, /* Oriya */
+  0x0BB0, /* Tamil */           /* No Reph */
+  0x0C30, /* Telugu */          /* No Reph */
+  0x0CB0, /* Kannada */
+  0x0D30, /* Malayalam */       /* No Reph */
+};
+
+
+#endif /* HB_OT_SHAPE_COMPLEX_INDIC_PRIVATE_HH */