harfbuzz-ng roll

third_party/harfbuzz-ng/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
@@ skipping 15 matching lines @@
  * 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"
+#include "hb-shaper-private.hh"
+#include "hb-shape-plan-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 {
+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
@@ skipping 11 matching lines @@
     HB_FONT_FUNCS_IMPLEMENT_CALLBACKS
 #undef HB_FONT_FUNC_IMPLEMENT
   } destroy;
 };
 
 
 /*
  * hb_face_t
  */
 
-struct _hb_face_t {
+struct hb_face_t {
   hb_object_header_t header;
   ASSERT_POD ();
 
   hb_bool_t immutable;
 
-  hb_reference_table_func_t  reference_table;
+  hb_reference_table_func_t  reference_table_func;
   void                      *user_data;
   hb_destroy_func_t          destroy;
 
-  struct hb_ot_layout_t *ot_layout;
+  unsigned int index;
+  mutable unsigned int upem;
 
-  unsigned int index;
-  unsigned int upem;
+  struct hb_shaper_data_t shaper_data;
+
+  struct plan_node_t {
+    hb_shape_plan_t *shape_plan;
+    plan_node_t *next;
+  } *shape_plans;
+
+
+  inline hb_blob_t *reference_table (hb_tag_t tag) const
+  {
+    hb_blob_t *blob;
+
+    if (unlikely (!this || !reference_table_func))
+      return hb_blob_get_empty ();
+
+    blob = reference_table_func (/*XXX*/const_cast<hb_face_t *> (this), tag, user_data);
+    if (unlikely (!blob))
+      return hb_blob_get_empty ();
+
+    return blob;
+  }
+
+  inline unsigned int get_upem (void) const
+  {
+    if (unlikely (!upem))
+      load_upem ();
+    return upem;
+  }
+
+  private:
+  HB_INTERNAL void load_upem (void) const;
 };
 
+#define HB_SHAPER_DATA_CREATE_FUNC_EXTRA_ARGS
+#define HB_SHAPER_IMPLEMENT(shaper) HB_SHAPER_DATA_PROTOTYPE(shaper, face);
+#include "hb-shaper-list.hh"
+#undef HB_SHAPER_IMPLEMENT
+#undef HB_SHAPER_DATA_CREATE_FUNC_EXTRA_ARGS
+
 
 /*
  * hb_font_t
  */
 
-struct _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 v * (int64_t) this->x_scale / this->parent->x_scale;
     return v;
@@ skipping 13 matching lines @@
   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 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 left_glyph, hb_codepoint_t right_glyph)
+  {
+    return klass->get.glyph_v_kerning (this, user_data,
+                                       left_glyph, right_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))) {
+      hb_bool_t ret = get_glyph_h_origin (glyph, x, y);
+      if (!ret && (ret = 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 {
+      hb_bool_t ret = get_glyph_v_origin (glyph, x, y);
+      if (!ret && (ret = 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;
+
+    snprintf (s, size, "gid%u", glyph);
+  }
+
+  /* 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 v * (int64_t) scale / hb_face_get_upem (this->face); }
 };
 
+#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 */