harfbuzz: check in harfbuzz-ng, add gyp define to use it

third_party/harfbuzz-ng/src/hb-font.cc

+/*
+ * Copyright (C) 2009  Red Hat, 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
+ */
+
+#include "hb-private.h"
+
+#include "hb-font-private.h"
+#include "hb-blob-private.h"
+#include "hb-open-file-private.hh"
+
+#include "hb-ot-layout-private.hh"
+
+#include <string.h>
+
+HB_BEGIN_DECLS
+
+
+/*
+ * hb_font_funcs_t
+ */
+
+static hb_codepoint_t
+hb_font_get_glyph_nil (hb_font_t *font HB_UNUSED,
+                       hb_face_t *face HB_UNUSED,
+                       const void *user_data HB_UNUSED,
+                       hb_codepoint_t unicode HB_UNUSED,
+                       hb_codepoint_t variation_selector HB_UNUSED)
+{ return 0; }
+
+static void
+hb_font_get_glyph_advance_nil (hb_font_t *font HB_UNUSED,
+                               hb_face_t *face HB_UNUSED,
+                               const void *user_data HB_UNUSED,
+                               hb_codepoint_t glyph HB_UNUSED,
+                               hb_position_t *x_advance HB_UNUSED,
+                               hb_position_t *y_advance HB_UNUSED)
+{ }
+
+static void
+hb_font_get_glyph_extents_nil (hb_font_t *font HB_UNUSED,
+                               hb_face_t *face HB_UNUSED,
+                               const void *user_data HB_UNUSED,
+                               hb_codepoint_t glyph HB_UNUSED,
+                               hb_glyph_extents_t *extents HB_UNUSED)
+{ }
+
+static hb_bool_t
+hb_font_get_contour_point_nil (hb_font_t *font HB_UNUSED,
+                               hb_face_t *face HB_UNUSED,
+                               const void *user_data HB_UNUSED,
+                               unsigned int point_index HB_UNUSED,
+                               hb_codepoint_t glyph HB_UNUSED,
+                               hb_position_t *x HB_UNUSED,
+                               hb_position_t *y HB_UNUSED)
+{ return false; }
+
+static hb_position_t
+hb_font_get_kerning_nil (hb_font_t *font HB_UNUSED,
+                         hb_face_t *face HB_UNUSED,
+                         const void *user_data HB_UNUSED,
+                         hb_codepoint_t first_glyph HB_UNUSED,
+                         hb_codepoint_t second_glyph HB_UNUSED)
+{ return 0; }
+
+hb_font_funcs_t _hb_font_funcs_nil = {
+  HB_REFERENCE_COUNT_INVALID, /* ref_count */
+  TRUE,  /* immutable */
+  {
+    hb_font_get_glyph_nil,
+    hb_font_get_glyph_advance_nil,
+    hb_font_get_glyph_extents_nil,
+    hb_font_get_contour_point_nil,
+    hb_font_get_kerning_nil
+  }
+};
+
+hb_font_funcs_t *
+hb_font_funcs_create (void)
+{
+  hb_font_funcs_t *ffuncs;
+
+  if (!HB_OBJECT_DO_CREATE (hb_font_funcs_t, ffuncs))
+    return &_hb_font_funcs_nil;
+
+  ffuncs->v = _hb_font_funcs_nil.v;
+
+  return ffuncs;
+}
+
+hb_font_funcs_t *
+hb_font_funcs_reference (hb_font_funcs_t *ffuncs)
+{
+  HB_OBJECT_DO_REFERENCE (ffuncs);
+}
+
+unsigned int
+hb_font_funcs_get_reference_count (hb_font_funcs_t *ffuncs)
+{
+  HB_OBJECT_DO_GET_REFERENCE_COUNT (ffuncs);
+}
+
+void
+hb_font_funcs_destroy (hb_font_funcs_t *ffuncs)
+{
+  HB_OBJECT_DO_DESTROY (ffuncs);
+
+  free (ffuncs);
+}
+
+hb_font_funcs_t *
+hb_font_funcs_copy (hb_font_funcs_t *other_ffuncs)
+{
+  hb_font_funcs_t *ffuncs;
+
+  if (!HB_OBJECT_DO_CREATE (hb_font_funcs_t, ffuncs))
+    return &_hb_font_funcs_nil;
+
+  ffuncs->v = other_ffuncs->v;
+
+  return ffuncs;
+}
+
+void
+hb_font_funcs_make_immutable (hb_font_funcs_t *ffuncs)
+{
+  if (HB_OBJECT_IS_INERT (ffuncs))
+    return;
+
+  ffuncs->immutable = TRUE;
+}
+
+hb_bool_t
+hb_font_funcs_is_immutable (hb_font_funcs_t *ffuncs)
+{
+  return ffuncs->immutable;
+}
+
+
+void
+hb_font_funcs_set_glyph_func (hb_font_funcs_t *ffuncs,
+                              hb_font_get_glyph_func_t glyph_func)
+{
+  if (ffuncs->immutable)
+    return;
+
+  ffuncs->v.get_glyph = glyph_func ? glyph_func : hb_font_get_glyph_nil;
+}
+
+void
+hb_font_funcs_set_glyph_advance_func (hb_font_funcs_t *ffuncs,
+                                      hb_font_get_glyph_advance_func_t glyph_advance_func)
+{
+  if (ffuncs->immutable)
+    return;
+
+  ffuncs->v.get_glyph_advance = glyph_advance_func ? glyph_advance_func : hb_font_get_glyph_advance_nil;
+}
+
+void
+hb_font_funcs_set_glyph_extents_func (hb_font_funcs_t *ffuncs,
+                                      hb_font_get_glyph_extents_func_t glyph_extents_func)
+{
+  if (ffuncs->immutable)
+    return;
+
+  ffuncs->v.get_glyph_extents = glyph_extents_func ? glyph_extents_func : hb_font_get_glyph_extents_nil;
+}
+
+void
+hb_font_funcs_set_contour_point_func (hb_font_funcs_t *ffuncs,
+                                      hb_font_get_contour_point_func_t contour_point_func)
+{
+  if (ffuncs->immutable)
+    return;
+
+  ffuncs->v.get_contour_point = contour_point_func ? contour_point_func : hb_font_get_contour_point_nil;
+}
+
+void
+hb_font_funcs_set_kerning_func (hb_font_funcs_t *ffuncs,
+                                hb_font_get_kerning_func_t kerning_func)
+{
+  if (ffuncs->immutable)
+    return;
+
+  ffuncs->v.get_kerning = kerning_func ? kerning_func : hb_font_get_kerning_nil;
+}
+
+
+hb_font_get_glyph_func_t
+hb_font_funcs_get_glyph_func (hb_font_funcs_t *ffuncs)
+{
+  return ffuncs->v.get_glyph;
+}
+
+hb_font_get_glyph_advance_func_t
+hb_font_funcs_get_glyph_advance_func (hb_font_funcs_t *ffuncs)
+{
+  return ffuncs->v.get_glyph_advance;
+}
+
+hb_font_get_glyph_extents_func_t
+hb_font_funcs_get_glyph_extents_func (hb_font_funcs_t *ffuncs)
+{
+  return ffuncs->v.get_glyph_extents;
+}
+
+hb_font_get_contour_point_func_t
+hb_font_funcs_get_contour_point_func (hb_font_funcs_t *ffuncs)
+{
+  return ffuncs->v.get_contour_point;
+}
+
+hb_font_get_kerning_func_t
+hb_font_funcs_get_kerning_func (hb_font_funcs_t *ffuncs)
+{
+  return ffuncs->v.get_kerning;
+}
+
+
+
+hb_codepoint_t
+hb_font_get_glyph (hb_font_t *font, hb_face_t *face,
+                   hb_codepoint_t unicode, hb_codepoint_t variation_selector)
+{
+  return font->klass->v.get_glyph (font, face, font->user_data,
+                                   unicode, variation_selector);
+}
+
+void
+hb_font_get_glyph_advance (hb_font_t *font, hb_face_t *face,
+                           hb_codepoint_t glyph,
+                           hb_position_t *x_advance, hb_position_t *y_advance)
+{
+  *x_advance = *y_advance = 0;
+  return font->klass->v.get_glyph_advance (font, face, font->user_data,
+                                           glyph, x_advance, y_advance);
+}
+
+void
+hb_font_get_glyph_extents (hb_font_t *font, hb_face_t *face,
+                           hb_codepoint_t glyph, hb_glyph_extents_t *extents)
+{
+  memset (extents, 0, sizeof (*extents));
+  return font->klass->v.get_glyph_extents (font, face, font->user_data,
+                                           glyph, extents);
+}
+
+hb_bool_t
+hb_font_get_contour_point (hb_font_t *font, hb_face_t *face,
+                           unsigned int point_index,
+                           hb_codepoint_t glyph, hb_position_t *x, hb_position_t *y)
+{
+  *x = 0; *y = 0;
+  return font->klass->v.get_contour_point (font, face, font->user_data,
+                                           point_index,
+                                           glyph, x, y);
+}
+
+hb_position_t
+hb_font_get_kerning (hb_font_t *font, hb_face_t *face,
+                     hb_codepoint_t first_glyph, hb_codepoint_t second_glyph)
+{
+  return font->klass->v.get_kerning (font, face, font->user_data,
+                                     first_glyph, second_glyph);
+}
+
+
+/*
+ * hb_face_t
+ */
+
+static hb_face_t _hb_face_nil = {
+  HB_REFERENCE_COUNT_INVALID, /* ref_count */
+
+  NULL, /* get_table */
+  NULL, /* destroy */
+  NULL, /* user_data */
+
+  NULL, /* head_blob */
+  NULL, /* head_table */
+
+  NULL  /* ot_layout */
+};
+
+
+hb_face_t *
+hb_face_create_for_tables (hb_get_table_func_t  get_table,
+                           hb_destroy_func_t    destroy,
+                           void                *user_data)
+{
+  hb_face_t *face;
+
+  if (!HB_OBJECT_DO_CREATE (hb_face_t, face)) {
+    if (destroy)
+      destroy (user_data);
+    return &_hb_face_nil;
+  }
+
+  face->get_table = get_table;
+  face->destroy = destroy;
+  face->user_data = user_data;
+
+  face->ot_layout = _hb_ot_layout_new (face);
+
+  face->head_blob = Sanitizer<head>::sanitize (hb_face_get_table (face, HB_OT_TAG_head));
+  face->head_table = Sanitizer<head>::lock_instance (face->head_blob);
+
+  return face;
+}
+
+
+typedef struct _hb_face_for_data_closure_t {
+  hb_blob_t *blob;
+  unsigned int  index;
+} hb_face_for_data_closure_t;
+
+static hb_face_for_data_closure_t *
+_hb_face_for_data_closure_create (hb_blob_t *blob, unsigned int index)
+{
+  hb_face_for_data_closure_t *closure;
+
+  closure = (hb_face_for_data_closure_t *) malloc (sizeof (hb_face_for_data_closure_t));
+  if (unlikely (!closure))
+    return NULL;
+
+  closure->blob = blob;
+  closure->index = index;
+
+  return closure;
+}
+
+static void
+_hb_face_for_data_closure_destroy (hb_face_for_data_closure_t *closure)
+{
+  hb_blob_destroy (closure->blob);
+  free (closure);
+}
+
+static hb_blob_t *
+_hb_face_for_data_get_table (hb_tag_t tag, void *user_data)
+{
+  hb_face_for_data_closure_t *data = (hb_face_for_data_closure_t *) user_data;
+
+  const OpenTypeFontFile &ot_file = *Sanitizer<OpenTypeFontFile>::lock_instance (data->blob);
+  const OpenTypeFontFace &ot_face = ot_file.get_face (data->index);
+
+  const OpenTypeTable &table = ot_face.get_table_by_tag (tag);
+
+  hb_blob_t *blob = hb_blob_create_sub_blob (data->blob, table.offset, table.length);
+
+  hb_blob_unlock (data->blob);
+
+  return blob;
+}
+
+hb_face_t *
+hb_face_create_for_data (hb_blob_t    *blob,
+                         unsigned int  index)
+{
+  hb_face_for_data_closure_t *closure = _hb_face_for_data_closure_create (Sanitizer<OpenTypeFontFile>::sanitize (hb_blob_reference (blob)), index);
+
+  if (unlikely (!closure))
+    return &_hb_face_nil;
+
+  return hb_face_create_for_tables (_hb_face_for_data_get_table,
+                                    (hb_destroy_func_t) _hb_face_for_data_closure_destroy,
+                                    closure);
+}
+
+
+hb_face_t *
+hb_face_reference (hb_face_t *face)
+{
+  HB_OBJECT_DO_REFERENCE (face);
+}
+
+unsigned int
+hb_face_get_reference_count (hb_face_t *face)
+{
+  HB_OBJECT_DO_GET_REFERENCE_COUNT (face);
+}
+
+void
+hb_face_destroy (hb_face_t *face)
+{
+  HB_OBJECT_DO_DESTROY (face);
+
+  _hb_ot_layout_free (face->ot_layout);
+
+  hb_blob_unlock (face->head_blob);
+  hb_blob_destroy (face->head_blob);
+
+  if (face->destroy)
+    face->destroy (face->user_data);
+
+  free (face);
+}
+
+hb_blob_t *
+hb_face_get_table (hb_face_t *face,
+                   hb_tag_t   tag)
+{
+  hb_blob_t *blob;
+
+  if (unlikely (!face || !face->get_table))
+    return &_hb_blob_nil;
+
+  blob = face->get_table (tag, face->user_data);
+
+  return blob;
+}
+
+unsigned int
+hb_face_get_upem (hb_face_t *face)
+{
+  return (face->head_table ? face->head_table : &Null(head))->get_upem ();
+}
+
+
+/*
+ * hb_font_t
+ */
+
+static hb_font_t _hb_font_nil = {
+  HB_REFERENCE_COUNT_INVALID, /* ref_count */
+
+  0, /* x_scale */
+  0, /* y_scale */
+
+  0, /* x_ppem */
+  0, /* y_ppem */
+
+  NULL, /* klass */
+  NULL, /* destroy */
+  NULL  /* user_data */
+};
+
+hb_font_t *
+hb_font_create (void)
+{
+  hb_font_t *font;
+
+  if (!HB_OBJECT_DO_CREATE (hb_font_t, font))
+    return &_hb_font_nil;
+
+  font->klass = &_hb_font_funcs_nil;
+
+  return font;
+}
+
+hb_font_t *
+hb_font_reference (hb_font_t *font)
+{
+  HB_OBJECT_DO_REFERENCE (font);
+}
+
+unsigned int
+hb_font_get_reference_count (hb_font_t *font)
+{
+  HB_OBJECT_DO_GET_REFERENCE_COUNT (font);
+}
+
+void
+hb_font_destroy (hb_font_t *font)
+{
+  HB_OBJECT_DO_DESTROY (font);
+
+  hb_font_funcs_destroy (font->klass);
+  if (font->destroy)
+    font->destroy (font->user_data);
+
+  free (font);
+}
+
+void
+hb_font_set_funcs (hb_font_t         *font,
+                   hb_font_funcs_t   *klass,
+                   hb_destroy_func_t  destroy,
+                   void              *user_data)
+{
+  if (HB_OBJECT_IS_INERT (font))
+    return;
+
+  if (font->destroy)
+    font->destroy (font->user_data);
+
+  if (!klass)
+    klass = &_hb_font_funcs_nil;
+
+  hb_font_funcs_reference (klass);
+  hb_font_funcs_destroy (font->klass);
+  font->klass = klass;
+  font->destroy = destroy;
+  font->user_data = user_data;
+}
+
+void
+hb_font_unset_funcs (hb_font_t          *font,
+                     hb_font_funcs_t   **klass,
+                     hb_destroy_func_t  *destroy,
+                     void              **user_data)
+{
+  /* None of the input arguments can be NULL. */
+
+  *klass = font->klass;
+  *destroy = font->destroy;
+  *user_data = font->user_data;
+
+  if (HB_OBJECT_IS_INERT (font))
+    return;
+
+  font->klass = NULL;
+  font->destroy = NULL;
+  font->user_data = NULL;
+}
+
+void
+hb_font_set_scale (hb_font_t *font,
+                   unsigned int x_scale,
+                   unsigned int y_scale)
+{
+  if (HB_OBJECT_IS_INERT (font))
+    return;
+
+  font->x_scale = x_scale;
+  font->y_scale = y_scale;
+}
+
+void
+hb_font_get_scale (hb_font_t *font,
+                   unsigned int *x_scale,
+                   unsigned int *y_scale)
+{
+  if (x_scale) *x_scale = font->x_scale;
+  if (y_scale) *y_scale = font->y_scale;
+}
+
+void
+hb_font_set_ppem (hb_font_t *font,
+                  unsigned int x_ppem,
+                  unsigned int y_ppem)
+{
+  if (HB_OBJECT_IS_INERT (font))
+    return;
+
+  font->x_ppem = x_ppem;
+  font->y_ppem = y_ppem;
+}
+
+void
+hb_font_get_ppem (hb_font_t *font,
+                  unsigned int *x_ppem,
+                  unsigned int *y_ppem)
+{
+  if (x_ppem) *x_ppem = font->x_ppem;
+  if (y_ppem) *y_ppem = font->y_ppem;
+}
+
+
+HB_END_DECLS