kc3-lang/harfbuzz/src/hb-font-private.hh

• Show log

  Commit

• Hash : 63d646fb
  Author :
  Date : 2011-05-11T00:15:37
  

  [font] Do user-space conversion when chaining up to parent font
  

Download

• src/hb-font-private.hh

• /*
   * Copyright © 2009  Red Hat, Inc.
   * Copyright © 2011  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.
   *
   * Red Hat Author(s): Behdad Esfahbod
   * Google Author(s): Behdad Esfahbod
   */
  
  #ifndef HB_FONT_PRIVATE_HH
  #define HB_FONT_PRIVATE_HH
  
  #include "hb-private.hh"
  
  #include "hb-font.h"
  #include "hb-object-private.hh"
  
  HB_BEGIN_DECLS
  
  
  /*
   * hb_font_funcs_t
   */
  
  struct _hb_font_funcs_t {
    hb_object_header_t header;
  
    hb_bool_t immutable;
  
    /* Don't access these directly.  Call hb_font_get_*() instead. */
  
    struct {
      hb_font_get_contour_point_func_t	contour_point;
      hb_font_get_glyph_advance_func_t	glyph_advance;
      hb_font_get_glyph_extents_func_t	glyph_extents;
      hb_font_get_glyph_func_t		glyph;
      hb_font_get_kerning_func_t		kerning;
    } get;
  
    struct {
      void				*contour_point;
      void				*glyph_advance;
      void				*glyph_extents;
      void				*glyph;
      void				*kerning;
    } user_data;
  
    struct {
      hb_destroy_func_t			contour_point;
      hb_destroy_func_t			glyph_advance;
      hb_destroy_func_t			glyph_extents;
      hb_destroy_func_t			glyph;
      hb_destroy_func_t			kerning;
    } destroy;
  };
  
  
  /*
   * hb_face_t
   */
  
  struct _hb_face_t {
    hb_object_header_t header;
  
    hb_get_table_func_t  get_table;
    void                *user_data;
    hb_destroy_func_t    destroy;
  
    struct hb_ot_layout_t *ot_layout;
  
    unsigned int upem;
  };
  
  
  /*
   * hb_font_t
   */
  
  struct _hb_font_t {
    hb_object_header_t header;
  
    hb_bool_t immutable;
  
    hb_font_t *parent;
    hb_face_t *face;
  
    int x_scale;
    int y_scale;
  
    unsigned int x_ppem;
    unsigned int y_ppem;
  
    hb_font_funcs_t   *klass;
    void              *user_data;
    hb_destroy_func_t  destroy;
  
  
    /* Convert from font-space to user-space */
    inline hb_position_t em_scale_x (int16_t v) { return em_scale (v, this->x_scale); }
    inline hb_position_t em_scale_y (int16_t v) { return em_scale (v, this->y_scale); }
  
    /* Convert from parent-font user-space to our user-space */
    inline hb_position_t parent_scale_x_distance (hb_position_t v) {
      if (unlikely (parent && parent->x_scale != x_scale))
        return v * (int64_t) this->x_scale / this->parent->x_scale;
      return v;
    }
    inline hb_position_t parent_scale_y_distance (hb_position_t v) {
      if (unlikely (parent && parent->y_scale != y_scale))
        return v * (int64_t) this->y_scale / this->parent->y_scale;
      return v;
    }
    inline hb_position_t parent_scale_x_position (hb_position_t v) {
      return parent_scale_x_distance (v); /* We don't have translation right now */
    }
    inline hb_position_t parent_scale_y_position (hb_position_t v) {
      return parent_scale_y_distance (v); /* We don't have translation right now */
    }
  
    inline void parent_scale_distance (hb_position_t *x, hb_position_t *y) {
      *x = parent_scale_x_distance (*x);
      *y = parent_scale_y_distance (*y);
    }
    inline void parent_scale_position (hb_position_t *x, hb_position_t *y) {
      *x = parent_scale_x_position (*x);
      *y = parent_scale_y_position (*y);
    }
  
  
    private:
    inline hb_position_t em_scale (int16_t v, int scale) { return v * (int64_t) scale / this->face->upem; }
  };
  
  
  HB_END_DECLS
  
  #endif /* HB_FONT_PRIVATE_HH */
  

Download