The Tor Browser: gfx/harfbuzz/src/hb-font-private.hh@b8a032363ba2 (annotated)

gfx/harfbuzz/src/hb-font-private.hh@b8a032363ba2 (annotated)

gfx/harfbuzz/src/hb-font-private.hh

Thu, 22 Jan 2015 13:21:57 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Thu, 22 Jan 2015 13:21:57 +0100
branch: TOR_BUG_9701
changeset 15: b8a032363ba2
permissions: -rw-r--r--

Incorporate requested changes from Mozilla in review:
https://bugzilla.mozilla.org/show_bug.cgi?id=1123480#c6

 /*
  * 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-object-private.hh"
 #include "hb-face-private.hh"
 #include "hb-shaper-private.hh"
 /*
  * hb_font_funcs_t
  */
 #define HB_FONT_FUNCS_IMPLEMENT_CALLBACKS \
   HB_FONT_FUNC_IMPLEMENT (glyph) \
   HB_FONT_FUNC_IMPLEMENT (glyph_h_advance) \
   HB_FONT_FUNC_IMPLEMENT (glyph_v_advance) \
   HB_FONT_FUNC_IMPLEMENT (glyph_h_origin) \
   HB_FONT_FUNC_IMPLEMENT (glyph_v_origin) \
   HB_FONT_FUNC_IMPLEMENT (glyph_h_kerning) \
   HB_FONT_FUNC_IMPLEMENT (glyph_v_kerning) \
   HB_FONT_FUNC_IMPLEMENT (glyph_extents) \
   HB_FONT_FUNC_IMPLEMENT (glyph_contour_point) \
   HB_FONT_FUNC_IMPLEMENT (glyph_name) \
   HB_FONT_FUNC_IMPLEMENT (glyph_from_name) \
   /* ^--- Add new callbacks here */
 struct hb_font_funcs_t {
   hb_object_header_t header;
   ASSERT_POD ();
   hb_bool_t immutable;
   /* Don't access these directly.  Call hb_font_get_*() instead. */
   struct {
 #define HB_FONT_FUNC_IMPLEMENT(name) hb_font_get_##name##_func_t name;
     HB_FONT_FUNCS_IMPLEMENT_CALLBACKS
 #undef HB_FONT_FUNC_IMPLEMENT
   } get;
   struct {
 #define HB_FONT_FUNC_IMPLEMENT(name) void *name;
     HB_FONT_FUNCS_IMPLEMENT_CALLBACKS
 #undef HB_FONT_FUNC_IMPLEMENT
   } user_data;
   struct {
 #define HB_FONT_FUNC_IMPLEMENT(name) hb_destroy_func_t name;
     HB_FONT_FUNCS_IMPLEMENT_CALLBACKS
 #undef HB_FONT_FUNC_IMPLEMENT
   } destroy;
 };
 /*
  * hb_font_t
  */
 struct hb_font_t {
   hb_object_header_t header;
   ASSERT_POD ();
   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;
   struct hb_shaper_data_t shaper_data;
   /* 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 (hb_position_t) (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 (hb_position_t) (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);
   }
   inline hb_position_t parent_scale_y_position (hb_position_t v) {
     return parent_scale_y_distance (v);
   }
   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);
   }
   /* Public getters */
   inline hb_bool_t has_glyph (hb_codepoint_t unicode)
   {
     hb_codepoint_t glyph;
     return get_glyph (unicode, 0, &glyph);
   }
   inline hb_bool_t get_glyph (hb_codepoint_t unicode, hb_codepoint_t variation_selector,
 			      hb_codepoint_t *glyph)
   {
     *glyph = 0;
     return klass->get.glyph (this, user_data,
 			     unicode, variation_selector, glyph,
 			     klass->user_data.glyph);
   }
   inline hb_position_t get_glyph_h_advance (hb_codepoint_t glyph)
   {
     return klass->get.glyph_h_advance (this, user_data,
 				       glyph,
 				       klass->user_data.glyph_h_advance);
   }
   inline hb_position_t get_glyph_v_advance (hb_codepoint_t glyph)
   {
     return klass->get.glyph_v_advance (this, user_data,
 				       glyph,
 				       klass->user_data.glyph_v_advance);
   }
   inline hb_bool_t get_glyph_h_origin (hb_codepoint_t glyph,
 				       hb_position_t *x, hb_position_t *y)
   {
     *x = *y = 0;
     return klass->get.glyph_h_origin (this, user_data,
 				      glyph, x, y,
 				      klass->user_data.glyph_h_origin);
   }
   inline hb_bool_t get_glyph_v_origin (hb_codepoint_t glyph,
 				       hb_position_t *x, hb_position_t *y)
   {
     *x = *y = 0;
     return klass->get.glyph_v_origin (this, user_data,
 				      glyph, x, y,
 				      klass->user_data.glyph_v_origin);
   }
   inline hb_position_t get_glyph_h_kerning (hb_codepoint_t left_glyph, hb_codepoint_t right_glyph)
   {
     return klass->get.glyph_h_kerning (this, user_data,
 				       left_glyph, right_glyph,
 				       klass->user_data.glyph_h_kerning);
   }
   inline hb_position_t get_glyph_v_kerning (hb_codepoint_t top_glyph, hb_codepoint_t bottom_glyph)
   {
     return klass->get.glyph_v_kerning (this, user_data,
 				       top_glyph, bottom_glyph,
 				       klass->user_data.glyph_v_kerning);
   }
   inline hb_bool_t get_glyph_extents (hb_codepoint_t glyph,
 				      hb_glyph_extents_t *extents)
   {
     memset (extents, 0, sizeof (*extents));
     return klass->get.glyph_extents (this, user_data,
 				     glyph,
 				     extents,
 				     klass->user_data.glyph_extents);
   }
   inline hb_bool_t get_glyph_contour_point (hb_codepoint_t glyph, unsigned int point_index,
 					    hb_position_t *x, hb_position_t *y)
   {
     *x = *y = 0;
     return klass->get.glyph_contour_point (this, user_data,
 					   glyph, point_index,
 					   x, y,
 					   klass->user_data.glyph_contour_point);
   }
   inline hb_bool_t get_glyph_name (hb_codepoint_t glyph,
 				   char *name, unsigned int size)
   {
     if (size) *name = '\0';
     return klass->get.glyph_name (this, user_data,
 				  glyph,
 				  name, size,
 				  klass->user_data.glyph_name);
   }
   inline hb_bool_t get_glyph_from_name (const char *name, int len, /* -1 means nul-terminated */
 					hb_codepoint_t *glyph)
   {
     *glyph = 0;
     if (len == -1) len = strlen (name);
     return klass->get.glyph_from_name (this, user_data,
 				       name, len,
 				       glyph,
 				       klass->user_data.glyph_from_name);
   }
   /* A bit higher-level, and with fallback */
   inline void get_glyph_advance_for_direction (hb_codepoint_t glyph,
 					       hb_direction_t direction,
 					       hb_position_t *x, hb_position_t *y)
   {
     if (likely (HB_DIRECTION_IS_HORIZONTAL (direction))) {
       *x = get_glyph_h_advance (glyph);
       *y = 0;
     } else {
       *x = 0;
       *y = get_glyph_v_advance (glyph);
     }
   }
   /* Internal only */
   inline void guess_v_origin_minus_h_origin (hb_codepoint_t glyph,
 					     hb_position_t *x, hb_position_t *y)
   {
     *x = get_glyph_h_advance (glyph) / 2;
     /* TODO use font_metics.ascent */
     *y = y_scale;
   }
   inline void get_glyph_origin_for_direction (hb_codepoint_t glyph,
 					      hb_direction_t direction,
 					      hb_position_t *x, hb_position_t *y)
   {
     if (likely (HB_DIRECTION_IS_HORIZONTAL (direction)))
     {
       if (!get_glyph_h_origin (glyph, x, y) &&
 	   get_glyph_v_origin (glyph, x, y))
       {
 	hb_position_t dx, dy;
 	guess_v_origin_minus_h_origin (glyph, &dx, &dy);
 	*x -= dx; *y -= dy;
       }
     }
     else
     {
       if (!get_glyph_v_origin (glyph, x, y) &&
 	   get_glyph_h_origin (glyph, x, y))
       {
 	hb_position_t dx, dy;
 	guess_v_origin_minus_h_origin (glyph, &dx, &dy);
 	*x += dx; *y += dy;
       }
     }
   }
   inline void add_glyph_origin_for_direction (hb_codepoint_t glyph,
 					      hb_direction_t direction,
 					      hb_position_t *x, hb_position_t *y)
   {
     hb_position_t origin_x, origin_y;
     get_glyph_origin_for_direction (glyph, direction, &origin_x, &origin_y);
     *x += origin_x;
     *y += origin_y;
   }
   inline void subtract_glyph_origin_for_direction (hb_codepoint_t glyph,
 						   hb_direction_t direction,
 						   hb_position_t *x, hb_position_t *y)
   {
     hb_position_t origin_x, origin_y;
     get_glyph_origin_for_direction (glyph, direction, &origin_x, &origin_y);
     *x -= origin_x;
     *y -= origin_y;
   }
   inline void get_glyph_kerning_for_direction (hb_codepoint_t first_glyph, hb_codepoint_t second_glyph,
 					       hb_direction_t direction,
 					       hb_position_t *x, hb_position_t *y)
   {
     if (likely (HB_DIRECTION_IS_HORIZONTAL (direction))) {
       *x = get_glyph_h_kerning (first_glyph, second_glyph);
       *y = 0;
     } else {
       *x = 0;
       *y = get_glyph_v_kerning (first_glyph, second_glyph);
     }
   }
   inline hb_bool_t get_glyph_extents_for_origin (hb_codepoint_t glyph,
 						 hb_direction_t direction,
 						 hb_glyph_extents_t *extents)
   {
     hb_bool_t ret = get_glyph_extents (glyph, extents);
     if (ret)
       subtract_glyph_origin_for_direction (glyph, direction, &extents->x_bearing, &extents->y_bearing);
     return ret;
   }
   inline hb_bool_t get_glyph_contour_point_for_origin (hb_codepoint_t glyph, unsigned int point_index,
 						       hb_direction_t direction,
 						       hb_position_t *x, hb_position_t *y)
   {
     hb_bool_t ret = get_glyph_contour_point (glyph, point_index, x, y);
     if (ret)
       subtract_glyph_origin_for_direction (glyph, direction, x, y);
     return ret;
   }
   /* Generates gidDDD if glyph has no name. */
   inline void
   glyph_to_string (hb_codepoint_t glyph,
 		   char *s, unsigned int size)
   {
     if (get_glyph_name (glyph, s, size)) return;
     if (size && snprintf (s, size, "gid%u", glyph) < 0)
       *s = '\0';
   }
   /* Parses gidDDD and uniUUUU strings automatically. */
   inline hb_bool_t
   glyph_from_string (const char *s, int len, /* -1 means nul-terminated */
 		     hb_codepoint_t *glyph)
   {
     if (get_glyph_from_name (s, len, glyph)) return true;
     if (len == -1) len = strlen (s);
     /* Straight glyph index. */
     if (hb_codepoint_parse (s, len, 10, glyph))
       return true;
     if (len > 3)
     {
       /* gidDDD syntax for glyph indices. */
       if (0 == strncmp (s, "gid", 3) &&
 	  hb_codepoint_parse (s + 3, len - 3, 10, glyph))
 	return true;
       /* uniUUUU and other Unicode character indices. */
       hb_codepoint_t unichar;
       if (0 == strncmp (s, "uni", 3) &&
 	  hb_codepoint_parse (s + 3, len - 3, 16, &unichar) &&
 	  get_glyph (unichar, 0, glyph))
 	return true;
     }
     return false;
   }
   private:
   inline hb_position_t em_scale (int16_t v, int scale) { return (hb_position_t) (v * (int64_t) scale / face->get_upem ()); }
 };
 #define HB_SHAPER_DATA_CREATE_FUNC_EXTRA_ARGS
 #define HB_SHAPER_IMPLEMENT(shaper) HB_SHAPER_DATA_PROTOTYPE(shaper, font);
 #include "hb-shaper-list.hh"
 #undef HB_SHAPER_IMPLEMENT
 #undef HB_SHAPER_DATA_CREATE_FUNC_EXTRA_ARGS
 #endif /* HB_FONT_PRIVATE_HH */

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gfx/harfbuzz/src/hb-font-private.hh@b8a032363ba2 (annotated)

gfx/harfbuzz/src/hb-font-private.hh