kc3-lang/harfbuzz/src/hb-aat-layout-opbd-table.hh

Branch - branch -main

• Show log

  Commit

• Hash : 7a890c2e
  Author :
  Date : 2024-09-22T13:19:02
  

  Add hb_barrier() to switches of unions
  
  https://github.com/harfbuzz/harfbuzz/pull/4864#issuecomment-2366923736
  

Download

• src/hb-aat-layout-opbd-table.hh

• /*
   * Copyright © 2019  Ebrahim Byagowi
   *
   *  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.
   */
  
  #ifndef HB_AAT_LAYOUT_OPBD_TABLE_HH
  #define HB_AAT_LAYOUT_OPBD_TABLE_HH
  
  #include "hb-aat-layout-common.hh"
  #include "hb-open-type.hh"
  
  /*
   * opbd -- Optical Bounds
   * https://developer.apple.com/fonts/TrueType-Reference-Manual/RM06/Chap6opbd.html
   */
  #define HB_AAT_TAG_opbd HB_TAG('o','p','b','d')
  
  
  namespace AAT {
  
  struct OpticalBounds
  {
    bool sanitize (hb_sanitize_context_t *c) const
    {
      TRACE_SANITIZE (this);
      return_trace (c->check_struct (this));
    }
  
    FWORD		leftSide;
    FWORD		topSide;
    FWORD		rightSide;
    FWORD		bottomSide;
    public:
    DEFINE_SIZE_STATIC (8);
  };
  
  struct opbdFormat0
  {
    bool get_bounds (hb_font_t *font, hb_codepoint_t glyph_id,
  		   hb_glyph_extents_t *extents, const void *base) const
    {
      const Offset16To<OpticalBounds> *bounds_offset = lookupTable.get_value (glyph_id, font->face->get_num_glyphs ());
      if (!bounds_offset) return false;
      const OpticalBounds &bounds = base+*bounds_offset;
  
      if (extents)
        *extents = {
  	font->em_scale_x (bounds.leftSide),
  	font->em_scale_y (bounds.topSide),
  	font->em_scale_x (bounds.rightSide),
  	font->em_scale_y (bounds.bottomSide)
        };
      return true;
    }
  
    bool sanitize (hb_sanitize_context_t *c, const void *base) const
    {
      TRACE_SANITIZE (this);
      return_trace (likely (c->check_struct (this) && lookupTable.sanitize (c, base)));
    }
  
    protected:
    Lookup<Offset16To<OpticalBounds>>
  		lookupTable;	/* Lookup table associating glyphs with the four
  				 * int16 values for the left-side, top-side,
  				 * right-side, and bottom-side optical bounds. */
    public:
    DEFINE_SIZE_MIN (2);
  };
  
  struct opbdFormat1
  {
    bool get_bounds (hb_font_t *font, hb_codepoint_t glyph_id,
  		   hb_glyph_extents_t *extents, const void *base) const
    {
      const Offset16To<OpticalBounds> *bounds_offset = lookupTable.get_value (glyph_id, font->face->get_num_glyphs ());
      if (!bounds_offset) return false;
      const OpticalBounds &bounds = base+*bounds_offset;
  
      hb_position_t left = 0, top = 0, right = 0, bottom = 0, ignore;
      if (font->get_glyph_contour_point (glyph_id, bounds.leftSide, &left, &ignore) ||
  	font->get_glyph_contour_point (glyph_id, bounds.topSide, &ignore, &top) ||
  	font->get_glyph_contour_point (glyph_id, bounds.rightSide, &right, &ignore) ||
  	font->get_glyph_contour_point (glyph_id, bounds.bottomSide, &ignore, &bottom))
      {
        if (extents)
  	*extents = {left, top, right, bottom};
        return true;
      }
      return false;
    }
  
    bool sanitize (hb_sanitize_context_t *c, const void *base) const
    {
      TRACE_SANITIZE (this);
      return_trace (likely (c->check_struct (this) && lookupTable.sanitize (c, base)));
    }
  
    protected:
    Lookup<Offset16To<OpticalBounds>>
  		lookupTable;	/* Lookup table associating glyphs with the four
  				 * int16 values for the left-side, top-side,
  				 * right-side, and bottom-side optical bounds. */
    public:
    DEFINE_SIZE_MIN (2);
  };
  
  struct opbd
  {
    static constexpr hb_tag_t tableTag = HB_AAT_TAG_opbd;
  
    bool get_bounds (hb_font_t *font, hb_codepoint_t glyph_id,
  		   hb_glyph_extents_t *extents) const
    {
      switch (format)
      {
      case 0: hb_barrier (); return u.format0.get_bounds (font, glyph_id, extents, this);
      case 1: hb_barrier (); return u.format1.get_bounds (font, glyph_id, extents, this);
      default:return false;
      }
    }
  
    bool sanitize (hb_sanitize_context_t *c) const
    {
      TRACE_SANITIZE (this);
      if (unlikely (!c->check_struct (this) || version.major != 1))
        return_trace (false);
      hb_barrier ();
  
      switch (format)
      {
      case 0: hb_barrier (); return_trace (u.format0.sanitize (c, this));
      case 1: hb_barrier (); return_trace (u.format1.sanitize (c, this));
      default:return_trace (true);
      }
    }
  
    protected:
    FixedVersion<>version;	/* Version number of the optical bounds
  				 * table (0x00010000 for the current version). */
    HBUINT16	format;		/* Format of the optical bounds table.
  				 * Format 0 indicates distance and Format 1 indicates
  				 * control point. */
    union {
    opbdFormat0	format0;
    opbdFormat1	format1;
    } u;
    public:
    DEFINE_SIZE_MIN (8);
  };
  
  } /* namespace AAT */
  
  
  #endif /* HB_AAT_LAYOUT_OPBD_TABLE_HH */
  

Download