kc3-lang/harfbuzz/src/hb-ot-shape-complex-private.hh

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• Hash : 9f9f04c2
  Author :
  Date : 2012-08-11T18:34:13
  

  [OT] Unbreak Thai shaping and fallback Arabic shaping
  
  The merger of normalizer and glyph-mapping broke shapers that
  modified text stream.  Unbreak them by adding a new preprocess_text
  shaping stage that happens before normalizing/cmap and disallow
  setup_mask modification of actual text.
  

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• src/hb-ot-shape-complex-private.hh

• /*
   * Copyright © 2010,2011,2012  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_PRIVATE_HH
  #define HB_OT_SHAPE_COMPLEX_PRIVATE_HH
  
  #include "hb-private.hh"
  
  #include "hb-ot-shape-private.hh"
  #include "hb-ot-shape-normalize-private.hh"
  
  
  
  /* buffer var allocations, used by complex shapers */
  #define complex_var_u8_0()	var2.u8[2]
  #define complex_var_u8_1()	var2.u8[3]
  
  
  
  /* Master OT shaper list */
  #define HB_COMPLEX_SHAPERS_IMPLEMENT_SHAPERS \
    HB_COMPLEX_SHAPER_IMPLEMENT (default) /* should be first */ \
    HB_COMPLEX_SHAPER_IMPLEMENT (arabic) \
    HB_COMPLEX_SHAPER_IMPLEMENT (indic) \
    HB_COMPLEX_SHAPER_IMPLEMENT (thai) \
    /* ^--- Add new shapers here */
  
  
  struct hb_ot_complex_shaper_t
  {
    char name[8];
  
    /* collect_features()
     * Called during shape_plan().
     * Shapers should use plan->map to add their features and callbacks.
     */
    void (*collect_features) (hb_ot_shape_planner_t *plan);
  
    /* override_features()
     * Called during shape_plan().
     * Shapers should use plan->map to override features and add callbacks after
     * common features are added.
     */
    void (*override_features) (hb_ot_shape_planner_t *plan);
  
  
    /* data_create()
     * Called at the end of shape_plan().
     * Whatever shapers return will be accessible through plan->data later.
     * If NULL is returned, means a plan failure.
     */
    void *(*data_create) (const hb_ot_shape_plan_t *plan);
  
    /* data_destroy()
     * Called when the shape_plan is being destroyed.
     * plan->data is passed here for destruction.
     * If NULL is returned, means a plan failure.
     * May be NULL. */
    void (*data_destroy) (void *data);
  
  
    /* preprocess_text()
     * Called during shape().
     * Shapers can use to modify text before shaping starts.
     */
    void (*preprocess_text) (const hb_ot_shape_plan_t *plan,
  			   hb_buffer_t              *buffer,
  			   hb_font_t                *font);
  
  
    /* normalization_preference()
     * Called during shape().
     */
    hb_ot_shape_normalization_mode_t
    (*normalization_preference) (const hb_ot_shape_plan_t *plan);
  
    /* setup_masks()
     * Called during shape().
     * Shapers should use map to get feature masks and set on buffer.
     * Shapers may NOT modify characters.
     */
    void (*setup_masks) (const hb_ot_shape_plan_t *plan,
  		       hb_buffer_t              *buffer,
  		       hb_font_t                *font);
  
    bool zero_width_attached_marks;
  };
  
  #define HB_COMPLEX_SHAPER_IMPLEMENT(name) extern HB_INTERNAL const hb_ot_complex_shaper_t _hb_ot_complex_shaper_##name;
  HB_COMPLEX_SHAPERS_IMPLEMENT_SHAPERS
  #undef HB_COMPLEX_SHAPER_IMPLEMENT
  
  
  static inline const hb_ot_complex_shaper_t *
  hb_ot_shape_complex_categorize (const hb_segment_properties_t *props)
  {
    switch ((hb_tag_t) props->script)
    {
      default:
        return &_hb_ot_complex_shaper_default;
  
  
      /* Unicode-1.1 additions */
      case HB_SCRIPT_ARABIC:
      case HB_SCRIPT_MONGOLIAN:
      case HB_SCRIPT_SYRIAC:
  
      /* Unicode-5.0 additions */
      case HB_SCRIPT_NKO:
  
      /* Unicode-6.0 additions */
      case HB_SCRIPT_MANDAIC:
  
        return &_hb_ot_complex_shaper_arabic;
  
  
      /* Unicode-1.1 additions */
      case HB_SCRIPT_THAI:
      case HB_SCRIPT_LAO:
  
        return &_hb_ot_complex_shaper_thai;
  
  
  
      /* ^--- Add new shapers here */
  
  
  #if 0
      /* Note:
       *
       * These disabled scripts are listed in ucd/IndicSyllabicCategory.txt, but according
       * to Martin Hosken and Jonathan Kew do not require complex shaping.
       *
       * TODO We should automate figuring out which scripts do not need complex shaping
       *
       * TODO We currently keep data for these scripts in our indic table.  Need to fix the
       * generator to not do that.
       */
  
  
      /* Simple? */
  
      /* Unicode-3.2 additions */
      case HB_SCRIPT_BUHID:
      case HB_SCRIPT_HANUNOO:
  
      /* Unicode-5.1 additions */
      case HB_SCRIPT_SAURASHTRA:
  
      /* Unicode-5.2 additions */
      case HB_SCRIPT_MEETEI_MAYEK:
  
      /* Unicode-6.0 additions */
      case HB_SCRIPT_BATAK:
      case HB_SCRIPT_BRAHMI:
  
  
      /* Simple */
  
      /* Unicode-1.1 additions */
      /* These have their own shaper now. */
      case HB_SCRIPT_LAO:
      case HB_SCRIPT_THAI:
  
      /* Unicode-2.0 additions */
      case HB_SCRIPT_TIBETAN:
  
      /* Unicode-3.2 additions */
      case HB_SCRIPT_TAGALOG:
      case HB_SCRIPT_TAGBANWA:
  
      /* Unicode-4.0 additions */
      case HB_SCRIPT_LIMBU:
      case HB_SCRIPT_TAI_LE:
  
      /* Unicode-4.1 additions */
      case HB_SCRIPT_SYLOTI_NAGRI:
  
      /* Unicode-5.0 additions */
      case HB_SCRIPT_PHAGS_PA:
  
      /* Unicode-5.1 additions */
      case HB_SCRIPT_KAYAH_LI:
  
      /* Unicode-5.2 additions */
      case HB_SCRIPT_TAI_VIET:
  
  
      /* May need Indic treatment in the future? */
  
      /* Unicode-3.0 additions */
      case HB_SCRIPT_MYANMAR:
  
  
  #endif
  
      /* Unicode-1.1 additions */
      case HB_SCRIPT_BENGALI:
      case HB_SCRIPT_DEVANAGARI:
      case HB_SCRIPT_GUJARATI:
      case HB_SCRIPT_GURMUKHI:
      case HB_SCRIPT_KANNADA:
      case HB_SCRIPT_MALAYALAM:
      case HB_SCRIPT_ORIYA:
      case HB_SCRIPT_TAMIL:
      case HB_SCRIPT_TELUGU:
  
      /* Unicode-3.0 additions */
      case HB_SCRIPT_KHMER:
      case HB_SCRIPT_SINHALA:
  
      /* Unicode-4.1 additions */
      case HB_SCRIPT_BUGINESE:
      case HB_SCRIPT_KHAROSHTHI:
      case HB_SCRIPT_NEW_TAI_LUE:
  
      /* Unicode-5.0 additions */
      case HB_SCRIPT_BALINESE:
  
      /* Unicode-5.1 additions */
      case HB_SCRIPT_CHAM:
      case HB_SCRIPT_LEPCHA:
      case HB_SCRIPT_REJANG:
      case HB_SCRIPT_SUNDANESE:
  
      /* Unicode-5.2 additions */
      case HB_SCRIPT_JAVANESE:
      case HB_SCRIPT_KAITHI:
      case HB_SCRIPT_TAI_THAM:
  
      /* Unicode-6.1 additions */
      case HB_SCRIPT_CHAKMA:
      case HB_SCRIPT_SHARADA:
      case HB_SCRIPT_TAKRI:
  
        return &_hb_ot_complex_shaper_indic;
    }
  }
  
  
  #endif /* HB_OT_SHAPE_COMPLEX_PRIVATE_HH */
  

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