HarfBuzz text shaping engine
http://harfbuzz.github.io/
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193 lines
6.3 KiB
193 lines
6.3 KiB
/* |
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* Copyright © 2012 Google, Inc. |
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* |
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* This is part of HarfBuzz, a text shaping library. |
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* |
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* Permission is hereby granted, without written agreement and without |
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* license or royalty fees, to use, copy, modify, and distribute this |
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* software and its documentation for any purpose, provided that the |
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* above copyright notice and the following two paragraphs appear in |
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* all copies of this software. |
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* |
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* IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR |
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* DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES |
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* ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN |
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* IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH |
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* DAMAGE. |
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* |
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* THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING, |
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* BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND |
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* FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS |
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* ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO |
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* PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS. |
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* |
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* Google Author(s): Behdad Esfahbod |
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*/ |
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#ifndef HB_OT_SHAPE_COMPLEX_INDIC_PRIVATE_HH |
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#define HB_OT_SHAPE_COMPLEX_INDIC_PRIVATE_HH |
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#include "hb-private.hh" |
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#include "hb-ot-shape-complex-private.hh" |
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/* buffer var allocations */ |
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#define indic_category() complex_var_persistent_u8_0() /* indic_category_t */ |
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#define indic_position() complex_var_persistent_u8_1() /* indic_matra_category_t */ |
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#define IN_HALF_BLOCK(u, Base) (((u) & ~0x7F) == (Base)) |
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#define IS_DEVA(u) (IN_HALF_BLOCK (u, 0x900)) |
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#define IS_BENG(u) (IN_HALF_BLOCK (u, 0x980)) |
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#define IS_GURM(u) (IN_HALF_BLOCK (u, 0xA00)) |
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#define IS_GUJA(u) (IN_HALF_BLOCK (u, 0xA80)) |
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#define IS_ORYA(u) (IN_HALF_BLOCK (u, 0xB00)) |
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#define IS_TAML(u) (IN_HALF_BLOCK (u, 0xB80)) |
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#define IS_TELU(u) (IN_HALF_BLOCK (u, 0xC00)) |
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#define IS_KNDA(u) (IN_HALF_BLOCK (u, 0xC80)) |
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#define IS_MLYM(u) (IN_HALF_BLOCK (u, 0xD00)) |
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#define IS_SINH(u) (IN_HALF_BLOCK (u, 0xD80)) |
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#define INDIC_TABLE_ELEMENT_TYPE uint8_t |
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/* Cateories used in the OpenType spec: |
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* https://www.microsoft.com/typography/otfntdev/devanot/shaping.aspx |
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*/ |
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/* Note: This enum is duplicated in the -machine.rl source file. |
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* Not sure how to avoid duplication. */ |
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enum indic_category_t { |
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OT_X = 0, |
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OT_C, |
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OT_V, |
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OT_N, |
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OT_H, |
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OT_ZWNJ, |
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OT_ZWJ, |
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OT_M, |
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OT_SM, |
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OT_VD, |
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OT_A, |
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OT_NBSP, |
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OT_DOTTEDCIRCLE, /* Not in the spec, but special in Uniscribe. /Very very/ special! */ |
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OT_RS, /* Register Shifter, used in Khmer OT spec */ |
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OT_Coeng, |
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OT_Repha, |
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OT_Ra /* Not explicitly listed in the OT spec, but used in the grammar. */ |
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}; |
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/* Visual positions in a syllable from left to right. */ |
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enum indic_position_t { |
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POS_START, |
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POS_RA_TO_BECOME_REPH, |
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POS_PRE_M, |
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POS_PRE_C, |
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POS_BASE_C, |
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POS_AFTER_MAIN, |
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POS_ABOVE_C, |
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POS_BEFORE_SUB, |
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POS_BELOW_C, |
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POS_AFTER_SUB, |
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POS_BEFORE_POST, |
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POS_POST_C, |
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POS_AFTER_POST, |
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POS_FINAL_C, |
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POS_SMVD, |
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POS_END |
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}; |
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/* Categories used in IndicSyllabicCategory.txt from UCD. */ |
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enum indic_syllabic_category_t { |
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INDIC_SYLLABIC_CATEGORY_OTHER = OT_X, |
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INDIC_SYLLABIC_CATEGORY_AVAGRAHA = OT_X, |
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INDIC_SYLLABIC_CATEGORY_BINDU = OT_SM, |
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INDIC_SYLLABIC_CATEGORY_CONSONANT = OT_C, |
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INDIC_SYLLABIC_CATEGORY_CONSONANT_DEAD = OT_C, |
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INDIC_SYLLABIC_CATEGORY_CONSONANT_FINAL = OT_C, |
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INDIC_SYLLABIC_CATEGORY_CONSONANT_HEAD_LETTER = OT_C, |
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INDIC_SYLLABIC_CATEGORY_CONSONANT_MEDIAL = OT_C, |
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INDIC_SYLLABIC_CATEGORY_CONSONANT_PLACEHOLDER = OT_NBSP, |
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INDIC_SYLLABIC_CATEGORY_CONSONANT_SUBJOINED = OT_C, |
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INDIC_SYLLABIC_CATEGORY_CONSONANT_REPHA = OT_Repha, |
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INDIC_SYLLABIC_CATEGORY_MODIFYING_LETTER = OT_X, |
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INDIC_SYLLABIC_CATEGORY_NUKTA = OT_N, |
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INDIC_SYLLABIC_CATEGORY_REGISTER_SHIFTER = OT_RS, |
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INDIC_SYLLABIC_CATEGORY_TONE_LETTER = OT_X, |
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INDIC_SYLLABIC_CATEGORY_TONE_MARK = OT_X, |
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INDIC_SYLLABIC_CATEGORY_VIRAMA = OT_H, |
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INDIC_SYLLABIC_CATEGORY_VISARGA = OT_SM, |
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INDIC_SYLLABIC_CATEGORY_VOWEL = OT_V, |
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INDIC_SYLLABIC_CATEGORY_VOWEL_DEPENDENT = OT_M, |
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INDIC_SYLLABIC_CATEGORY_VOWEL_INDEPENDENT = OT_V |
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}; |
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/* Categories used in IndicSMatraCategory.txt from UCD */ |
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enum indic_matra_category_t { |
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INDIC_MATRA_CATEGORY_NOT_APPLICABLE = POS_END, |
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INDIC_MATRA_CATEGORY_LEFT = POS_PRE_C, |
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INDIC_MATRA_CATEGORY_TOP = POS_ABOVE_C, |
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INDIC_MATRA_CATEGORY_BOTTOM = POS_BELOW_C, |
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INDIC_MATRA_CATEGORY_RIGHT = POS_POST_C, |
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/* These should resolve to the position of the last part of the split sequence. */ |
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INDIC_MATRA_CATEGORY_BOTTOM_AND_RIGHT = INDIC_MATRA_CATEGORY_RIGHT, |
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INDIC_MATRA_CATEGORY_LEFT_AND_RIGHT = INDIC_MATRA_CATEGORY_RIGHT, |
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INDIC_MATRA_CATEGORY_TOP_AND_BOTTOM = INDIC_MATRA_CATEGORY_BOTTOM, |
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INDIC_MATRA_CATEGORY_TOP_AND_BOTTOM_AND_RIGHT = INDIC_MATRA_CATEGORY_RIGHT, |
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INDIC_MATRA_CATEGORY_TOP_AND_LEFT = INDIC_MATRA_CATEGORY_TOP, |
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INDIC_MATRA_CATEGORY_TOP_AND_LEFT_AND_RIGHT = INDIC_MATRA_CATEGORY_RIGHT, |
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INDIC_MATRA_CATEGORY_TOP_AND_RIGHT = INDIC_MATRA_CATEGORY_RIGHT, |
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INDIC_MATRA_CATEGORY_INVISIBLE = INDIC_MATRA_CATEGORY_NOT_APPLICABLE, |
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INDIC_MATRA_CATEGORY_OVERSTRUCK = INDIC_MATRA_CATEGORY_NOT_APPLICABLE, |
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INDIC_MATRA_CATEGORY_VISUAL_ORDER_LEFT = INDIC_MATRA_CATEGORY_NOT_APPLICABLE |
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}; |
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/* Note: We use ASSERT_STATIC_EXPR_ZERO() instead of ASSERT_STATIC_EXPR() and the comma operation |
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* because gcc fails to optimize the latter and fills the table in at runtime. */ |
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#define INDIC_COMBINE_CATEGORIES(S,M) \ |
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(ASSERT_STATIC_EXPR_ZERO (M == INDIC_MATRA_CATEGORY_NOT_APPLICABLE || (S == INDIC_SYLLABIC_CATEGORY_VIRAMA || S == INDIC_SYLLABIC_CATEGORY_VOWEL_DEPENDENT)) + \ |
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ASSERT_STATIC_EXPR_ZERO (S < 16 && M < 16) + \ |
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((M << 4) | S)) |
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#include "hb-ot-shape-complex-indic-table.hh" |
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/* XXX |
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* This is a hack for now. We should move this data into the main Indic table. |
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* Or completely remove it and just check in the tables. |
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*/ |
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static const hb_codepoint_t ra_chars[] = { |
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0x0930, /* Devanagari */ |
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0x09B0, /* Bengali */ |
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0x09F0, /* Bengali */ |
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0x0A30, /* Gurmukhi */ /* No Reph */ |
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0x0AB0, /* Gujarati */ |
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0x0B30, /* Oriya */ |
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0x0BB0, /* Tamil */ /* No Reph */ |
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0x0C30, /* Telugu */ /* Reph formed only with ZWJ */ |
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0x0CB0, /* Kannada */ |
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0x0D30, /* Malayalam */ /* No Reph, Logical Repha */ |
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0x0DBB, /* Sinhala */ /* Reph formed only with ZWJ */ |
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0x179A, /* Khmer */ /* No Reph, Visual Repha */ |
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}; |
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#endif /* HB_OT_SHAPE_COMPLEX_INDIC_PRIVATE_HH */
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