Update harfbuzz-ng to 1a5a91dc0d8bf4b72a2f22dc6300b06ad7000b79.

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
+ * 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_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) \
+  /* ^--- Add new callbacks here */
+
+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 {
+#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_face_t
+ */
+
+struct _hb_face_t {
+  hb_object_header_t header;
+
+  hb_bool_t immutable;
+
+  hb_reference_table_func_t  reference_table;
+  void                      *user_data;
+  hb_destroy_func_t          destroy;
+
+  struct hb_ot_layout_t *ot_layout;
+
+  unsigned int index;
+  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);
+  }
+  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);
+  }
+
+
+  private:
+  inline hb_position_t em_scale (int16_t v, int scale) { return v * (int64_t) scale / hb_face_get_upem (this->face); }
+};
+
+
+
+#endif /* HB_FONT_PRIVATE_HH */