kc3-lang/harfbuzz/src/hb-ot-font.cc

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• Hash : b0cb9a1a
  Author :
  Date : 2022-07-03T15:32:32
  

  Make get_leading_bearing return bool
  
  Fixes https://github.com/harfbuzz/harfbuzz/issues/3496
  
  Part of supporting >64k glyphs correctly.
  

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• src/hb-ot-font.cc

• /*
   * Copyright © 2011,2014  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, Roozbeh Pournader
   */
  
  #include "hb.hh"
  
  #ifndef HB_NO_OT_FONT
  
  #include "hb-ot.h"
  
  #include "hb-cache.hh"
  #include "hb-font.hh"
  #include "hb-machinery.hh"
  #include "hb-ot-face.hh"
  
  #include "hb-ot-cmap-table.hh"
  #include "hb-ot-glyf-table.hh"
  #include "hb-ot-cff1-table.hh"
  #include "hb-ot-cff2-table.hh"
  #include "hb-ot-hmtx-table.hh"
  #include "hb-ot-os2-table.hh"
  #include "hb-ot-post-table.hh"
  #include "hb-ot-stat-table.hh" // Just so we compile it; unused otherwise.
  #include "hb-ot-vorg-table.hh"
  #include "hb-ot-color-cbdt-table.hh"
  #include "hb-ot-color-sbix-table.hh"
  
  
  /**
   * SECTION:hb-ot-font
   * @title: hb-ot-font
   * @short_description: OpenType font implementation
   * @include: hb-ot.h
   *
   * Functions for using OpenType fonts with hb_shape().  Note that fonts returned
   * by hb_font_create() default to using these functions, so most clients would
   * never need to call these functions directly.
   **/
  
  struct hb_ot_font_t
  {
    const hb_ot_face_t *ot_face;
  
    /* h_advance caching */
    mutable hb_atomic_int_t cached_coords_serial;
    mutable hb_atomic_ptr_t<hb_advance_cache_t> advance_cache;
  };
  
  static hb_ot_font_t *
  _hb_ot_font_create (hb_font_t *font)
  {
    hb_ot_font_t *ot_font = (hb_ot_font_t *) hb_calloc (1, sizeof (hb_ot_font_t));
    if (unlikely (!ot_font))
      return nullptr;
  
    ot_font->ot_face = &font->face->table;
  
    return ot_font;
  }
  
  static void
  _hb_ot_font_destroy (void *font_data)
  {
    hb_ot_font_t *ot_font = (hb_ot_font_t *) font_data;
  
    auto *cache = ot_font->advance_cache.get_relaxed ();
    if (cache)
    {
      cache->fini ();
      hb_free (cache);
    }
  
    hb_free (ot_font);
  }
  
  static hb_bool_t
  hb_ot_get_nominal_glyph (hb_font_t *font HB_UNUSED,
  			 void *font_data,
  			 hb_codepoint_t unicode,
  			 hb_codepoint_t *glyph,
  			 void *user_data HB_UNUSED)
  {
    const hb_ot_font_t *ot_font = (const hb_ot_font_t *) font_data;
    const hb_ot_face_t *ot_face = ot_font->ot_face;
    return ot_face->cmap->get_nominal_glyph (unicode, glyph);
  }
  
  static unsigned int
  hb_ot_get_nominal_glyphs (hb_font_t *font HB_UNUSED,
  			  void *font_data,
  			  unsigned int count,
  			  const hb_codepoint_t *first_unicode,
  			  unsigned int unicode_stride,
  			  hb_codepoint_t *first_glyph,
  			  unsigned int glyph_stride,
  			  void *user_data HB_UNUSED)
  {
    const hb_ot_font_t *ot_font = (const hb_ot_font_t *) font_data;
    const hb_ot_face_t *ot_face = ot_font->ot_face;
    return ot_face->cmap->get_nominal_glyphs (count,
  					    first_unicode, unicode_stride,
  					    first_glyph, glyph_stride);
  }
  
  static hb_bool_t
  hb_ot_get_variation_glyph (hb_font_t *font HB_UNUSED,
  			   void *font_data,
  			   hb_codepoint_t unicode,
  			   hb_codepoint_t variation_selector,
  			   hb_codepoint_t *glyph,
  			   void *user_data HB_UNUSED)
  {
    const hb_ot_font_t *ot_font = (const hb_ot_font_t *) font_data;
    const hb_ot_face_t *ot_face = ot_font->ot_face;
    return ot_face->cmap->get_variation_glyph (unicode, variation_selector, glyph);
  }
  
  static void
  hb_ot_get_glyph_h_advances (hb_font_t* font, void* font_data,
  			    unsigned count,
  			    const hb_codepoint_t *first_glyph,
  			    unsigned glyph_stride,
  			    hb_position_t *first_advance,
  			    unsigned advance_stride,
  			    void *user_data HB_UNUSED)
  {
    const hb_ot_font_t *ot_font = (const hb_ot_font_t *) font_data;
    const hb_ot_face_t *ot_face = ot_font->ot_face;
    const OT::hmtx_accelerator_t &hmtx = *ot_face->hmtx;
  
  #ifndef HB_NO_VAR
    const OT::HVAR &HVAR = *hmtx.var_table;
    const OT::VariationStore &varStore = &HVAR + HVAR.varStore;
    OT::VariationStore::cache_t *varStore_cache = font->num_coords * count >= 128 ? varStore.create_cache () : nullptr;
  
    bool use_cache = font->num_coords;
  #else
    OT::VariationStore::cache_t *varStore_cache = nullptr;
    bool use_cache = false;
  #endif
  
    hb_advance_cache_t *cache = nullptr;
    if (use_cache)
    {
    retry:
      cache = ot_font->advance_cache.get ();
      if (unlikely (!cache))
      {
        cache = (hb_advance_cache_t *) hb_malloc (sizeof (hb_advance_cache_t));
        if (unlikely (!cache))
        {
  	use_cache = false;
  	goto out;
        }
  
        cache->init ();
        if (unlikely (!ot_font->advance_cache.cmpexch (nullptr, cache)))
        {
  	hb_free (cache);
  	goto retry;
        }
        ot_font->cached_coords_serial.set (font->serial_coords);
      }
    }
    out:
  
    if (!use_cache)
    {
      for (unsigned int i = 0; i < count; i++)
      {
        *first_advance = font->em_scale_x (hmtx.get_advance_with_var_unscaled (*first_glyph, font, varStore_cache));
        first_glyph = &StructAtOffsetUnaligned<hb_codepoint_t> (first_glyph, glyph_stride);
        first_advance = &StructAtOffsetUnaligned<hb_position_t> (first_advance, advance_stride);
      }
    }
    else
    { /* Use cache. */
      if (ot_font->cached_coords_serial.get () != (int) font->serial_coords)
      {
        ot_font->advance_cache->init ();
        ot_font->cached_coords_serial.set (font->serial_coords);
      }
  
      for (unsigned int i = 0; i < count; i++)
      {
        hb_position_t v;
        unsigned cv;
        if (ot_font->advance_cache->get (*first_glyph, &cv))
  	v = cv;
        else
        {
          v = hmtx.get_advance_with_var_unscaled (*first_glyph, font, varStore_cache);
  	ot_font->advance_cache->set (*first_glyph, v);
        }
        *first_advance = font->em_scale_x (v);
        first_glyph = &StructAtOffsetUnaligned<hb_codepoint_t> (first_glyph, glyph_stride);
        first_advance = &StructAtOffsetUnaligned<hb_position_t> (first_advance, advance_stride);
      }
    }
  
  #ifndef HB_NO_VAR
    OT::VariationStore::destroy_cache (varStore_cache);
  #endif
  }
  
  #ifndef HB_NO_VERTICAL
  static void
  hb_ot_get_glyph_v_advances (hb_font_t* font, void* font_data,
  			    unsigned count,
  			    const hb_codepoint_t *first_glyph,
  			    unsigned glyph_stride,
  			    hb_position_t *first_advance,
  			    unsigned advance_stride,
  			    void *user_data HB_UNUSED)
  {
    const hb_ot_font_t *ot_font = (const hb_ot_font_t *) font_data;
    const hb_ot_face_t *ot_face = ot_font->ot_face;
    const OT::vmtx_accelerator_t &vmtx = *ot_face->vmtx;
  
    if (vmtx.has_data ())
    {
  #ifndef HB_NO_VAR
      const OT::VVAR &VVAR = *vmtx.var_table;
      const OT::VariationStore &varStore = &VVAR + VVAR.varStore;
      OT::VariationStore::cache_t *varStore_cache = font->num_coords ? varStore.create_cache () : nullptr;
  #else
      OT::VariationStore::cache_t *varStore_cache = nullptr;
  #endif
  
      for (unsigned int i = 0; i < count; i++)
      {
        *first_advance = font->em_scale_y (-(int) vmtx.get_advance_with_var_unscaled (*first_glyph, font, varStore_cache));
        first_glyph = &StructAtOffsetUnaligned<hb_codepoint_t> (first_glyph, glyph_stride);
        first_advance = &StructAtOffsetUnaligned<hb_position_t> (first_advance, advance_stride);
      }
  
  #ifndef HB_NO_VAR
      OT::VariationStore::destroy_cache (varStore_cache);
  #endif
    }
    else
    {
      hb_font_extents_t font_extents;
      font->get_h_extents_with_fallback (&font_extents);
      hb_position_t advance = -(font_extents.ascender - font_extents.descender);
  
      for (unsigned int i = 0; i < count; i++)
      {
        *first_advance = advance;
        first_glyph = &StructAtOffsetUnaligned<hb_codepoint_t> (first_glyph, glyph_stride);
        first_advance = &StructAtOffsetUnaligned<hb_position_t> (first_advance, advance_stride);
      }
    }
  }
  #endif
  
  #ifndef HB_NO_VERTICAL
  static hb_bool_t
  hb_ot_get_glyph_v_origin (hb_font_t *font,
  			  void *font_data,
  			  hb_codepoint_t glyph,
  			  hb_position_t *x,
  			  hb_position_t *y,
  			  void *user_data HB_UNUSED)
  {
    const hb_ot_font_t *ot_font = (const hb_ot_font_t *) font_data;
    const hb_ot_face_t *ot_face = ot_font->ot_face;
  
    *x = font->get_glyph_h_advance (glyph) / 2;
  
    const OT::VORG &VORG = *ot_face->VORG;
    if (VORG.has_data ())
    {
      float delta = 0;
  
  #ifndef HB_NO_VAR
      const OT::vmtx_accelerator_t &vmtx = *ot_face->vmtx;
      const OT::VVAR &VVAR = *vmtx.var_table;
      if (font->num_coords)
        VVAR.get_vorg_delta_unscaled (glyph,
  				    font->coords, font->num_coords,
  				    &delta);
  #endif
  
      *y = font->em_scalef_y (VORG.get_y_origin (glyph) + delta);
      return true;
    }
  
    hb_glyph_extents_t extents = {0};
    if (ot_face->glyf->get_extents (font, glyph, &extents))
    {
      const OT::vmtx_accelerator_t &vmtx = *ot_face->vmtx;
      int tsb = 0;
      if (vmtx.get_leading_bearing_with_var_unscaled (font, glyph, &tsb))
      {
        *y = extents.y_bearing + font->em_scale_y (tsb);
        return true;
      }
  
      hb_font_extents_t font_extents;
      font->get_h_extents_with_fallback (&font_extents);
      hb_position_t advance = font_extents.ascender - font_extents.descender;
      int diff = advance - -extents.height;
      *y = extents.y_bearing + (diff >> 1);
      return true;
    }
  
    hb_font_extents_t font_extents;
    font->get_h_extents_with_fallback (&font_extents);
    *y = font_extents.ascender;
  
    return true;
  }
  #endif
  
  static hb_bool_t
  hb_ot_get_glyph_extents (hb_font_t *font,
  			 void *font_data,
  			 hb_codepoint_t glyph,
  			 hb_glyph_extents_t *extents,
  			 void *user_data HB_UNUSED)
  {
    const hb_ot_font_t *ot_font = (const hb_ot_font_t *) font_data;
    const hb_ot_face_t *ot_face = ot_font->ot_face;
  
  #if !defined(HB_NO_OT_FONT_BITMAP) && !defined(HB_NO_COLOR)
    if (ot_face->sbix->get_extents (font, glyph, extents)) return true;
  #endif
    if (ot_face->glyf->get_extents (font, glyph, extents)) return true;
  #ifndef HB_NO_OT_FONT_CFF
    if (ot_face->cff1->get_extents (font, glyph, extents)) return true;
    if (ot_face->cff2->get_extents (font, glyph, extents)) return true;
  #endif
  #if !defined(HB_NO_OT_FONT_BITMAP) && !defined(HB_NO_COLOR)
    if (ot_face->CBDT->get_extents (font, glyph, extents)) return true;
  #endif
  
    // TODO Hook up side-bearings variations.
    return false;
  }
  
  #ifndef HB_NO_OT_FONT_GLYPH_NAMES
  static hb_bool_t
  hb_ot_get_glyph_name (hb_font_t *font HB_UNUSED,
  		      void *font_data,
  		      hb_codepoint_t glyph,
  		      char *name, unsigned int size,
  		      void *user_data HB_UNUSED)
  {
    const hb_ot_font_t *ot_font = (const hb_ot_font_t *) font_data;
    const hb_ot_face_t *ot_face = ot_font->ot_face;
  
    if (ot_face->post->get_glyph_name (glyph, name, size)) return true;
  #ifndef HB_NO_OT_FONT_CFF
    if (ot_face->cff1->get_glyph_name (glyph, name, size)) return true;
  #endif
    return false;
  }
  static hb_bool_t
  hb_ot_get_glyph_from_name (hb_font_t *font HB_UNUSED,
  			   void *font_data,
  			   const char *name, int len,
  			   hb_codepoint_t *glyph,
  			   void *user_data HB_UNUSED)
  {
    const hb_ot_font_t *ot_font = (const hb_ot_font_t *) font_data;
    const hb_ot_face_t *ot_face = ot_font->ot_face;
  
    if (ot_face->post->get_glyph_from_name (name, len, glyph)) return true;
  #ifndef HB_NO_OT_FONT_CFF
      if (ot_face->cff1->get_glyph_from_name (name, len, glyph)) return true;
  #endif
    return false;
  }
  #endif
  
  static hb_bool_t
  hb_ot_get_font_h_extents (hb_font_t *font,
  			  void *font_data HB_UNUSED,
  			  hb_font_extents_t *metrics,
  			  void *user_data HB_UNUSED)
  {
    return _hb_ot_metrics_get_position_common (font, HB_OT_METRICS_TAG_HORIZONTAL_ASCENDER, &metrics->ascender) &&
  	 _hb_ot_metrics_get_position_common (font, HB_OT_METRICS_TAG_HORIZONTAL_DESCENDER, &metrics->descender) &&
  	 _hb_ot_metrics_get_position_common (font, HB_OT_METRICS_TAG_HORIZONTAL_LINE_GAP, &metrics->line_gap);
  }
  
  #ifndef HB_NO_VERTICAL
  static hb_bool_t
  hb_ot_get_font_v_extents (hb_font_t *font,
  			  void *font_data HB_UNUSED,
  			  hb_font_extents_t *metrics,
  			  void *user_data HB_UNUSED)
  {
    return _hb_ot_metrics_get_position_common (font, HB_OT_METRICS_TAG_VERTICAL_ASCENDER, &metrics->ascender) &&
  	 _hb_ot_metrics_get_position_common (font, HB_OT_METRICS_TAG_VERTICAL_DESCENDER, &metrics->descender) &&
  	 _hb_ot_metrics_get_position_common (font, HB_OT_METRICS_TAG_VERTICAL_LINE_GAP, &metrics->line_gap);
  }
  #endif
  
  #ifndef HB_NO_DRAW
  static void
  hb_ot_get_glyph_shape (hb_font_t *font,
  		       void *font_data HB_UNUSED,
  		       hb_codepoint_t glyph,
  		       hb_draw_funcs_t *draw_funcs, void *draw_data,
  		       void *user_data)
  {
    hb_draw_session_t draw_session (draw_funcs, draw_data, font->slant_xy);
    if (font->face->table.glyf->get_path (font, glyph, draw_session)) return;
  #ifndef HB_NO_CFF
    if (font->face->table.cff1->get_path (font, glyph, draw_session)) return;
    if (font->face->table.cff2->get_path (font, glyph, draw_session)) return;
  #endif
  }
  #endif
  
  static inline void free_static_ot_funcs ();
  
  static struct hb_ot_font_funcs_lazy_loader_t : hb_font_funcs_lazy_loader_t<hb_ot_font_funcs_lazy_loader_t>
  {
    static hb_font_funcs_t *create ()
    {
      hb_font_funcs_t *funcs = hb_font_funcs_create ();
  
      hb_font_funcs_set_nominal_glyph_func (funcs, hb_ot_get_nominal_glyph, nullptr, nullptr);
      hb_font_funcs_set_nominal_glyphs_func (funcs, hb_ot_get_nominal_glyphs, nullptr, nullptr);
      hb_font_funcs_set_variation_glyph_func (funcs, hb_ot_get_variation_glyph, nullptr, nullptr);
  
      hb_font_funcs_set_font_h_extents_func (funcs, hb_ot_get_font_h_extents, nullptr, nullptr);
      hb_font_funcs_set_glyph_h_advances_func (funcs, hb_ot_get_glyph_h_advances, nullptr, nullptr);
      //hb_font_funcs_set_glyph_h_origin_func (funcs, hb_ot_get_glyph_h_origin, nullptr, nullptr);
  
  #ifndef HB_NO_VERTICAL
      hb_font_funcs_set_font_v_extents_func (funcs, hb_ot_get_font_v_extents, nullptr, nullptr);
      hb_font_funcs_set_glyph_v_advances_func (funcs, hb_ot_get_glyph_v_advances, nullptr, nullptr);
      hb_font_funcs_set_glyph_v_origin_func (funcs, hb_ot_get_glyph_v_origin, nullptr, nullptr);
  #endif
  
  #ifndef HB_NO_DRAW
      hb_font_funcs_set_glyph_shape_func (funcs, hb_ot_get_glyph_shape, nullptr, nullptr);
  #endif
  
      hb_font_funcs_set_glyph_extents_func (funcs, hb_ot_get_glyph_extents, nullptr, nullptr);
      //hb_font_funcs_set_glyph_contour_point_func (funcs, hb_ot_get_glyph_contour_point, nullptr, nullptr);
  
  #ifndef HB_NO_OT_FONT_GLYPH_NAMES
      hb_font_funcs_set_glyph_name_func (funcs, hb_ot_get_glyph_name, nullptr, nullptr);
      hb_font_funcs_set_glyph_from_name_func (funcs, hb_ot_get_glyph_from_name, nullptr, nullptr);
  #endif
  
      hb_font_funcs_make_immutable (funcs);
  
      hb_atexit (free_static_ot_funcs);
  
      return funcs;
    }
  } static_ot_funcs;
  
  static inline
  void free_static_ot_funcs ()
  {
    static_ot_funcs.free_instance ();
  }
  
  static hb_font_funcs_t *
  _hb_ot_get_font_funcs ()
  {
    return static_ot_funcs.get_unconst ();
  }
  
  
  /**
   * hb_ot_font_set_funcs:
   * @font: #hb_font_t to work upon
   *
   * Sets the font functions to use when working with @font. 
   *
   * Since: 0.9.28
   **/
  void
  hb_ot_font_set_funcs (hb_font_t *font)
  {
    hb_ot_font_t *ot_font = _hb_ot_font_create (font);
    if (unlikely (!ot_font))
      return;
  
    hb_font_set_funcs (font,
  		     _hb_ot_get_font_funcs (),
  		     ot_font,
  		     _hb_ot_font_destroy);
  }
  
  #ifndef HB_NO_VAR
  bool
  _glyf_get_leading_bearing_with_var_unscaled (hb_font_t *font, hb_codepoint_t glyph, bool is_vertical,
  					     int *lsb)
  {
    return font->face->table.glyf->get_leading_bearing_with_var_unscaled (font, glyph, is_vertical, lsb);
  }
  
  unsigned
  _glyf_get_advance_with_var_unscaled (hb_font_t *font, hb_codepoint_t glyph, bool is_vertical)
  {
    return font->face->table.glyf->get_advance_with_var_unscaled (font, glyph, is_vertical);
  }
  #endif
  
  
  #endif
  

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