[HarfBuzz] harfbuzz-ng: Branch 'master' - 2 commits

Behdad Esfahbod behdad at kemper.freedesktop.org
Tue Jul 24 12:53:39 PDT 2012


 configure.ac                         |   12 +
 src/Makefile.am                      |    7 
 src/hb-coretext-private.hh           |   42 ++++
 src/hb-coretext.cc                   |  323 +++++++++++++++++++++++++++++++++++
 src/hb-coretext.h                    |   43 ++++
 src/hb-open-file-private.hh          |    8 
 src/hb-ot-head-table.hh              |    2 
 src/hb-ot-hhea-table.hh              |    2 
 src/hb-ot-hmtx-table.hh              |    2 
 src/hb-ot-layout-common-private.hh   |   14 -
 src/hb-ot-layout-gdef-table.hh       |   20 +-
 src/hb-ot-layout-gpos-table.hh       |   48 ++---
 src/hb-ot-layout-gsub-table.hh       |   30 +--
 src/hb-ot-layout-gsubgpos-private.hh |   32 +--
 src/hb-ot-maxp-table.hh              |    2 
 src/hb-ot-name-table.hh              |    2 
 src/hb-shape.cc                      |    6 
 17 files changed, 515 insertions(+), 80 deletions(-)

New commits:
commit aa6d849838d5231465ae1a25a4dd5ea1e9380ff9
Author: Jonathan Kew <jfkthame at gmail.com>
Date:   Tue Jul 24 15:52:32 2012 -0400

    [CoreText] Add basic Core Text backend for comparison with our native shaping
    
    Does not attempt to handle clusters in a Uniscribe- or HarfBuzz-compatible way;
    just returns the original string indexes that CT maintains. These may even be
    out-of-order in the case of reordrant glyphs.

diff --git a/configure.ac b/configure.ac
index cbabf83..030b04a 100644
--- a/configure.ac
+++ b/configure.ac
@@ -186,6 +186,18 @@ AM_CONDITIONAL(HAVE_UNISCRIBE, $have_uniscribe)
 
 dnl ===========================================================================
 
+AC_CHECK_HEADERS(ApplicationServices/ApplicationServices.h, have_coretext=true, have_coretext=false)
+if $have_coretext; then
+	CORETEXT_CFLAGS=
+	CORETEXT_LIBS=
+	AC_SUBST(CORETEXT_CFLAGS)
+	AC_SUBST(CORETEXT_LIBS)
+	AC_DEFINE(HAVE_CORETEXT, 1, [Have Core Text backend])
+fi
+AM_CONDITIONAL(HAVE_CORETEXT, $have_coretext)
+
+dnl ===========================================================================
+
 AC_CACHE_CHECK([for Intel atomic primitives], hb_cv_have_intel_atomic_primitives, [
 	hb_cv_have_intel_atomic_primitives=false
 	AC_TRY_LINK([
diff --git a/src/Makefile.am b/src/Makefile.am
index 9fd135a..f2fce6e 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -138,6 +138,13 @@ HBSOURCES += hb-uniscribe.cc hb-uniscribe-private.hh
 HBHEADERS += hb-uniscribe.h
 endif
 
+if HAVE_CORETEXT
+HBCFLAGS += $(CORETEXT_CFLAGS)
+HBLIBS   += $(CORETEXT_LIBS)
+HBSOURCES += hb-coretext.cc hb-coretext-private.hh
+HBHEADERS += hb-coretext.h
+endif
+
 # Use a C linker, not C++; Don't link to libstdc++
 libharfbuzz_la_LINK = $(LINK) $(libharfbuzz_la_LDFLAGS)
 libharfbuzz_la_SOURCES = $(HBSOURCES) $(HBHEADERS)
diff --git a/src/hb-coretext-private.hh b/src/hb-coretext-private.hh
new file mode 100644
index 0000000..153106c
--- /dev/null
+++ b/src/hb-coretext-private.hh
@@ -0,0 +1,42 @@
+/*
+ * Copyright © 2012  Mozilla Foundation.
+ *
+ *  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.
+ *
+ * Mozilla Author(s): Jonathan Kew
+ */
+
+#ifndef HB_CORETEXT_PRIVATE_HH
+#define HB_CORETEXT_PRIVATE_HH
+
+#include "hb-private.hh"
+
+#include "hb-coretext.h"
+
+
+HB_INTERNAL hb_bool_t
+_hb_coretext_shape (hb_font_t          *font,
+		     hb_buffer_t        *buffer,
+		     const hb_feature_t *features,
+		     unsigned int        num_features);
+
+
+#endif /* HB_CORETEXT_PRIVATE_HH */
diff --git a/src/hb-coretext.cc b/src/hb-coretext.cc
new file mode 100644
index 0000000..f49e76e
--- /dev/null
+++ b/src/hb-coretext.cc
@@ -0,0 +1,323 @@
+/*
+ * Copyright © 2012  Mozilla Foundation.
+ *
+ *  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.
+ *
+ * Mozilla Author(s): Jonathan Kew
+ */
+
+#include "hb-private.hh"
+
+#define GlyphID GlyphID_mac
+#include <ApplicationServices/ApplicationServices.h>
+#undef GlyphID
+
+#include "hb-coretext.h"
+
+#include "hb-ot-name-table.hh"
+#include "hb-ot-tag.h"
+
+#include "hb-font-private.hh"
+#include "hb-buffer-private.hh"
+
+
+#ifndef HB_DEBUG_CORETEXT
+#define HB_DEBUG_CORETEXT (HB_DEBUG+0)
+#endif
+
+
+static hb_user_data_key_t hb_coretext_data_key;
+
+static struct hb_coretext_face_data_t {
+  CGFontRef  cg_font;
+} _hb_coretext_face_data_nil = {0};
+
+static void
+_hb_coretext_face_data_destroy (hb_coretext_face_data_t *data)
+{
+  if (data->cg_font)
+    CFRelease (data->cg_font);
+  free (data);
+}
+
+static void
+release_data (void *info, const void *data, size_t size)
+{
+  assert (hb_blob_get_length ((hb_blob_t *) info) == size &&
+          hb_blob_get_data ((hb_blob_t *) info, NULL) == data);
+
+  hb_blob_destroy ((hb_blob_t *) info);
+}
+
+static hb_coretext_face_data_t *
+_hb_coretext_face_get_data (hb_face_t *face)
+{
+  hb_coretext_face_data_t *data = (hb_coretext_face_data_t *) hb_face_get_user_data (face, &hb_coretext_data_key);
+  if (likely (data)) return data;
+
+  data = (hb_coretext_face_data_t *) calloc (1, sizeof (hb_coretext_face_data_t));
+  if (unlikely (!data))
+    return &_hb_coretext_face_data_nil;
+
+
+  hb_blob_t *blob = hb_face_reference_blob (face);
+  unsigned int blob_length;
+  const char *blob_data = hb_blob_get_data (blob, &blob_length);
+  if (unlikely (!blob_length))
+    DEBUG_MSG (CORETEXT, face, "Face has empty blob");
+
+  CGDataProviderRef provider = CGDataProviderCreateWithData (blob, blob_data, blob_length, &release_data);
+  data->cg_font = CGFontCreateWithDataProvider (provider);
+  CGDataProviderRelease (provider);
+
+  if (unlikely (!data->cg_font))
+    DEBUG_MSG (CORETEXT, face, "Face CGFontCreateWithDataProvider() failed");
+
+
+  if (unlikely (!hb_face_set_user_data (face, &hb_coretext_data_key, data,
+                                        (hb_destroy_func_t) _hb_coretext_face_data_destroy,
+                                        false)))
+  {
+    _hb_coretext_face_data_destroy (data);
+    data = (hb_coretext_face_data_t *) hb_face_get_user_data (face, &hb_coretext_data_key);
+    if (data)
+      return data;
+    else
+      return &_hb_coretext_face_data_nil;
+  }
+
+  return data;
+}
+
+
+static struct hb_coretext_font_data_t {
+  CTFontRef ct_font;
+} _hb_coretext_font_data_nil = {0};
+
+static void
+_hb_coretext_font_data_destroy (hb_coretext_font_data_t *data)
+{
+  if (data->ct_font)
+    CFRelease (data->ct_font);
+  free (data);
+}
+
+static hb_coretext_font_data_t *
+_hb_coretext_font_get_data (hb_font_t *font)
+{
+  hb_coretext_font_data_t *data = (hb_coretext_font_data_t *) hb_font_get_user_data (font, &hb_coretext_data_key);
+  if (likely (data)) return data;
+
+  data = (hb_coretext_font_data_t *) calloc (1, sizeof (hb_coretext_font_data_t));
+  if (unlikely (!data))
+    return &_hb_coretext_font_data_nil;
+
+  hb_coretext_face_data_t *face_data = _hb_coretext_face_get_data (font->face);
+
+  data->ct_font = CTFontCreateWithGraphicsFont (face_data->cg_font, font->y_scale, NULL, NULL);
+  if (unlikely (!data->ct_font))
+    DEBUG_MSG (CORETEXT, font, "Font CTFontCreateWithGraphicsFont() failed");
+
+  if (unlikely (!hb_font_set_user_data (font, &hb_coretext_data_key, data,
+                                        (hb_destroy_func_t) _hb_coretext_font_data_destroy,
+                                        false)))
+  {
+    _hb_coretext_font_data_destroy (data);
+    data = (hb_coretext_font_data_t *) hb_font_get_user_data (font, &hb_coretext_data_key);
+    if (data)
+      return data;
+    else
+      return &_hb_coretext_font_data_nil;
+  }
+
+  return data;
+}
+
+CTFontRef
+hb_coretext_font_get_ct_font (hb_font_t *font)
+{
+  hb_coretext_font_data_t *font_data = _hb_coretext_font_get_data (font);
+  if (unlikely (!font_data))
+    return 0;
+  return font_data->ct_font;
+}
+
+
+hb_bool_t
+_hb_coretext_shape (hb_font_t          *font,
+                    hb_buffer_t        *buffer,
+                    const hb_feature_t *features,
+                    unsigned int        num_features)
+{
+  buffer->guess_properties ();
+
+#define FAIL(...) \
+  HB_STMT_START { \
+    DEBUG_MSG (CORETEXT, NULL, __VA_ARGS__); \
+    return false; \
+  } HB_STMT_END;
+
+  hb_coretext_face_data_t *face_data = _hb_coretext_face_get_data (font->face);
+  if (unlikely (!face_data->cg_font))
+    FAIL ("Couldn't get face data");
+
+  hb_coretext_font_data_t *font_data = _hb_coretext_font_get_data (font);
+  if (unlikely (!font_data->ct_font))
+    FAIL ("Couldn't get font font");
+
+  if (unlikely (!buffer->len))
+    return true;
+
+  unsigned int scratch_size;
+  char *scratch = (char *) buffer->get_scratch_buffer (&scratch_size);
+
+#define utf16_index() var1.u32
+
+  UniChar *pchars = (UniChar *) scratch;
+  unsigned int chars_len = 0;
+  for (unsigned int i = 0; i < buffer->len; i++) {
+    hb_codepoint_t c = buffer->info[i].codepoint;
+    buffer->info[i].utf16_index() = chars_len;
+    if (likely (c < 0x10000))
+      pchars[chars_len++] = c;
+    else if (unlikely (c >= 0x110000))
+      pchars[chars_len++] = 0xFFFD;
+    else {
+      pchars[chars_len++] = 0xD800 + ((c - 0x10000) >> 10);
+      pchars[chars_len++] = 0xDC00 + ((c - 0x10000) & ((1 << 10) - 1));
+    }
+  }
+
+#undef utf16_index
+
+  CFStringRef string_ref = CFStringCreateWithCharactersNoCopy (kCFAllocatorDefault,
+                                                               pchars, chars_len,
+                                                               kCFAllocatorNull);
+
+  CFDictionaryRef attrs = CFDictionaryCreate (kCFAllocatorDefault,
+                                              (const void**) &kCTFontAttributeName,
+                                              (const void**) &font_data->ct_font,
+                                              1, // count of attributes
+                                              &kCFTypeDictionaryKeyCallBacks,
+                                              &kCFTypeDictionaryValueCallBacks);
+
+  // TODO: support features
+
+  // Now we can create an attributed string
+  CFAttributedStringRef attr_string = CFAttributedStringCreate (kCFAllocatorDefault, string_ref, attrs);
+  CFRelease (string_ref);
+  CFRelease (attrs);
+
+  // Create the CoreText line from our string, then we're done with it
+  CTLineRef line = CTLineCreateWithAttributedString (attr_string);
+  CFRelease (attr_string);
+
+  // and finally retrieve the glyph data and store into the gfxTextRun
+  CFArrayRef glyph_runs = CTLineGetGlyphRuns (line);
+  unsigned int num_runs = CFArrayGetCount (glyph_runs);
+
+  // Iterate through the glyph runs.
+  bool success = true;
+  buffer->len = 0;
+
+  const CFRange range_all = CFRangeMake (0, 0);
+
+  for (unsigned int i = 0; i < num_runs; i++) {
+    CTRunRef run = (CTRunRef) CFArrayGetValueAtIndex (glyph_runs, i);
+
+    unsigned int num_glyphs = CTRunGetGlyphCount (run);
+    if (num_glyphs == 0)
+      continue;
+
+    buffer->ensure (buffer->len + num_glyphs);
+
+    // retrieve the laid-out glyph data from the CTRun
+
+    // Testing indicates that CTRunGetGlyphsPtr (almost?) always succeeds,
+    // and so copying data to our own buffer with CTRunGetGlyphs will be
+    // extremely rare.
+
+    unsigned int scratch_size;
+    char *scratch = (char *) buffer->get_scratch_buffer (&scratch_size);
+
+#define ALLOCATE_ARRAY(Type, name, len) \
+  Type *name = (Type *) scratch; \
+  scratch += len * sizeof (name[0]); \
+  scratch_size -= len * sizeof (name[0]);
+
+    const CGGlyph* glyphs = CTRunGetGlyphsPtr (run);
+    if (!glyphs) {
+      ALLOCATE_ARRAY (CGGlyph, glyph_buf, num_glyphs);
+      CTRunGetGlyphs (run, range_all, glyph_buf);
+      glyphs = glyph_buf;
+    }
+
+    const CGPoint* positions = CTRunGetPositionsPtr (run);
+    if (!positions) {
+      ALLOCATE_ARRAY (CGPoint, position_buf, num_glyphs);
+      CTRunGetPositions (run, range_all, position_buf);
+      positions = position_buf;
+    }
+
+    const CFIndex* string_indices = CTRunGetStringIndicesPtr (run);
+    if (!string_indices) {
+      ALLOCATE_ARRAY (CFIndex, index_buf, num_glyphs);
+      CTRunGetStringIndices (run, range_all, index_buf);
+      string_indices = index_buf;
+    }
+
+#undef ALLOCATE_ARRAY
+
+    double run_width = CTRunGetTypographicBounds (run, range_all, NULL, NULL, NULL);
+
+    for (unsigned int j = 0; j < num_glyphs; j++) {
+      double advance = (j + 1 < num_glyphs ? positions[j + 1].x : positions[0].x + run_width) - positions[j].x;
+
+      hb_glyph_info_t *info = &buffer->info[buffer->len];
+      hb_glyph_position_t *pos = &buffer->pos[buffer->len];
+
+      info->codepoint = glyphs[j];
+      info->cluster = string_indices[j];
+
+      // currently, we do all x-positioning by setting the advance, we never use x-offset
+      info->mask = advance;
+      info->var1.u32 = 0;
+      info->var2.u32 = positions[j].y;
+
+      buffer->len++;
+    }
+  }
+
+  buffer->clear_positions ();
+
+  unsigned int count = buffer->len;
+  for (unsigned int i = 0; i < count; ++i) {
+    hb_glyph_info_t *info = &buffer->info[i];
+    hb_glyph_position_t *pos = &buffer->pos[i];
+
+    /* TODO vertical */
+    pos->x_advance = info->mask;
+    pos->x_offset = info->var1.u32;
+    pos->y_offset = info->var2.u32;
+  }
+
+  return true;
+}
diff --git a/src/hb-coretext.h b/src/hb-coretext.h
new file mode 100644
index 0000000..0b34203
--- /dev/null
+++ b/src/hb-coretext.h
@@ -0,0 +1,43 @@
+/*
+ * Copyright © 2012  Mozilla Foundation.
+ *
+ *  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.
+ *
+ * Mozilla Author(s): Jonathan Kew
+ */
+
+#ifndef HB_CORETEXT_H
+#define HB_CORETEXT_H
+
+#include "hb.h"
+
+#include <ApplicationServices/ApplicationServices.h>
+
+HB_BEGIN_DECLS
+
+
+CTFontRef
+hb_coretext_font_get_ct_font (hb_font_t *font);
+
+
+HB_END_DECLS
+
+#endif /* HB_CORETEXT_H */
diff --git a/src/hb-shape.cc b/src/hb-shape.cc
index 60a2dce..57a979b 100644
--- a/src/hb-shape.cc
+++ b/src/hb-shape.cc
@@ -36,6 +36,9 @@
 #ifdef HAVE_UNISCRIBE
 # include "hb-uniscribe-private.hh"
 #endif
+#ifdef HAVE_CORETEXT
+# include "hb-coretext-private.hh"
+#endif
 #ifdef HAVE_OT
 # include "hb-ot-shape-private.hh"
 #endif
@@ -58,6 +61,9 @@ static const struct hb_shaper_pair_t {
 #ifdef HAVE_UNISCRIBE
   HB_SHAPER_IMPLEMENT (uniscribe),
 #endif
+#ifdef HAVE_CORETEXT
+  HB_SHAPER_IMPLEMENT (coretext),
+#endif
 #ifdef HAVE_OT
   HB_SHAPER_IMPLEMENT (ot),
 #endif
commit ec8d2494694275dfbbac2dd0d33ca2894b0463d6
Author: Behdad Esfahbod <behdad at behdad.org>
Date:   Tue Jul 24 15:40:37 2012 -0400

    Make data members of various OpenType structs protected instead of private
    
    Should fix warnings generated when building with -Wunused-private-field.
    Based on patch from Jonathan Kew.

diff --git a/src/hb-open-file-private.hh b/src/hb-open-file-private.hh
index ce18580..e2d4a2c 100644
--- a/src/hb-open-file-private.hh
+++ b/src/hb-open-file-private.hh
@@ -105,7 +105,7 @@ typedef struct OffsetTable
     return TRACE_RETURN (c->check_struct (this) && c->check_array (tables, TableRecord::static_size, numTables));
   }
 
-  private:
+  protected:
   Tag		sfnt_version;	/* '\0\001\0\00' if TrueType / 'OTTO' if CFF */
   USHORT	numTables;	/* Number of tables. */
   USHORT	searchRange;	/* (Maximum power of 2 <= numTables) x 16 */
@@ -133,7 +133,7 @@ struct TTCHeaderVersion1
     return TRACE_RETURN (table.sanitize (c, this));
   }
 
-  private:
+  protected:
   Tag		ttcTag;		/* TrueType Collection ID string: 'ttcf' */
   FixedVersion	version;	/* Version of the TTC Header (1.0),
 				 * 0x00010000 */
@@ -177,7 +177,7 @@ struct TTCHeader
     }
   }
 
-  private:
+  protected:
   union {
   struct {
   Tag		ttcTag;		/* TrueType Collection ID string: 'ttcf' */
@@ -242,7 +242,7 @@ struct OpenTypeFontFile
     }
   }
 
-  private:
+  protected:
   union {
   Tag			tag;		/* 4-byte identifier. */
   OpenTypeFontFace	fontFace;
diff --git a/src/hb-ot-head-table.hh b/src/hb-ot-head-table.hh
index 32d64ca..bf2d245 100644
--- a/src/hb-ot-head-table.hh
+++ b/src/hb-ot-head-table.hh
@@ -54,7 +54,7 @@ struct head
     return TRACE_RETURN (c->check_struct (this) && likely (version.major == 1));
   }
 
-  private:
+  protected:
   FixedVersion	version;		/* Version of the head table--currently
 					 * 0x00010000 for version 1.0. */
   FixedVersion	fontRevision;		/* Set by font manufacturer. */
diff --git a/src/hb-ot-hhea-table.hh b/src/hb-ot-hhea-table.hh
index 2eea05a..24f8bdc 100644
--- a/src/hb-ot-hhea-table.hh
+++ b/src/hb-ot-hhea-table.hh
@@ -47,7 +47,7 @@ struct hhea
     return TRACE_RETURN (c->check_struct (this) && likely (version.major == 1));
   }
 
-  private:
+  protected:
   FixedVersion	version;		/* 0x00010000 for version 1.0. */
   FWORD		ascender;		/* Typographic ascent. <a
 					 * href="http://developer.apple.com/fonts/TTRefMan/RM06/Chap6hhea.html">
diff --git a/src/hb-ot-hmtx-table.hh b/src/hb-ot-hmtx-table.hh
index 35cfb48..cc7cfbb 100644
--- a/src/hb-ot-hmtx-table.hh
+++ b/src/hb-ot-hmtx-table.hh
@@ -57,7 +57,7 @@ struct hmtx
     return TRACE_RETURN (true);
   }
 
-  private:
+  protected:
   LongHorMetric	longHorMetric[VAR];	/* Paired advance width and left side
 					 * bearing values for each glyph. The
 					 * value numOfHMetrics comes from
diff --git a/src/hb-ot-layout-common-private.hh b/src/hb-ot-layout-common-private.hh
index a990b15..c7e458f 100644
--- a/src/hb-ot-layout-common-private.hh
+++ b/src/hb-ot-layout-common-private.hh
@@ -231,7 +231,7 @@ struct Script
     return TRACE_RETURN (defaultLangSys.sanitize (c, this) && langSys.sanitize (c, this));
   }
 
-  private:
+  protected:
   OffsetTo<LangSys>
 		defaultLangSys;	/* Offset to DefaultLangSys table--from
 				 * beginning of Script table--may be Null */
@@ -379,7 +379,7 @@ struct CoverageFormat1
     unsigned int i;
   };
 
-  private:
+  protected:
   USHORT	coverageFormat;	/* Format identifier--format = 1 */
   SortedArrayOf<GlyphID>
 		glyphArray;	/* Array of GlyphIDs--in numerical order */
@@ -454,7 +454,7 @@ struct CoverageFormat2
     unsigned int i, j, coverage;
   };
 
-  private:
+  protected:
   USHORT	coverageFormat;	/* Format identifier--format = 2 */
   SortedArrayOf<RangeRecord>
 		rangeRecord;	/* Array of glyph ranges--ordered by
@@ -560,7 +560,7 @@ struct Coverage
     } u;
   };
 
-  private:
+  protected:
   union {
   USHORT		format;		/* Format identifier */
   CoverageFormat1	format1;
@@ -600,6 +600,7 @@ struct ClassDefFormat1
     return false;
   }
 
+  protected:
   USHORT	classFormat;		/* Format identifier--format = 1 */
   GlyphID	startGlyph;		/* First GlyphID of the classValueArray */
   ArrayOf<USHORT>
@@ -634,6 +635,7 @@ struct ClassDefFormat2
     return false;
   }
 
+  protected:
   USHORT	classFormat;	/* Format identifier--format = 2 */
   SortedArrayOf<RangeRecord>
 		rangeRecord;	/* Array of glyph ranges--ordered by
@@ -673,7 +675,7 @@ struct ClassDef
     }
   }
 
-  private:
+  protected:
   union {
   USHORT		format;		/* Format identifier */
   ClassDefFormat1	format1;
@@ -744,7 +746,7 @@ struct Device
     return TRACE_RETURN (c->check_struct (this) && c->check_range (this, this->get_size ()));
   }
 
-  private:
+  protected:
   USHORT	startSize;		/* Smallest size to correct--in ppem */
   USHORT	endSize;		/* Largest size to correct--in ppem */
   USHORT	deltaFormat;		/* Format of DeltaValue array data: 1, 2, or 3
diff --git a/src/hb-ot-layout-gdef-table.hh b/src/hb-ot-layout-gdef-table.hh
index f29fc14..54149d7 100644
--- a/src/hb-ot-layout-gdef-table.hh
+++ b/src/hb-ot-layout-gdef-table.hh
@@ -74,7 +74,7 @@ struct AttachList
     return TRACE_RETURN (coverage.sanitize (c, this) && attachPoint.sanitize (c, this));
   }
 
-  private:
+  protected:
   OffsetTo<Coverage>
 		coverage;		/* Offset to Coverage table -- from
 					 * beginning of AttachList table */
@@ -104,7 +104,7 @@ struct CaretValueFormat1
     return TRACE_RETURN (c->check_struct (this));
   }
 
-  private:
+  protected:
   USHORT	caretValueFormat;	/* Format identifier--format = 1 */
   SHORT		coordinate;		/* X or Y value, in design units */
   public:
@@ -130,7 +130,7 @@ struct CaretValueFormat2
     return TRACE_RETURN (c->check_struct (this));
   }
 
-  private:
+  protected:
   USHORT	caretValueFormat;	/* Format identifier--format = 2 */
   USHORT	caretValuePoint;	/* Contour point index on glyph */
   public:
@@ -153,7 +153,7 @@ struct CaretValueFormat3
     return TRACE_RETURN (c->check_struct (this) && deviceTable.sanitize (c, this));
   }
 
-  private:
+  protected:
   USHORT	caretValueFormat;	/* Format identifier--format = 3 */
   SHORT		coordinate;		/* X or Y value, in design units */
   OffsetTo<Device>
@@ -187,7 +187,7 @@ struct CaretValue
     }
   }
 
-  private:
+  protected:
   union {
   USHORT		format;		/* Format identifier */
   CaretValueFormat1	format1;
@@ -222,7 +222,7 @@ struct LigGlyph
     return TRACE_RETURN (carets.sanitize (c, this));
   }
 
-  private:
+  protected:
   OffsetArrayOf<CaretValue>
 		carets;			/* Offset array of CaretValue tables
 					 * --from beginning of LigGlyph table
@@ -256,7 +256,7 @@ struct LigCaretList
     return TRACE_RETURN (coverage.sanitize (c, this) && ligGlyph.sanitize (c, this));
   }
 
-  private:
+  protected:
   OffsetTo<Coverage>
 		coverage;		/* Offset to Coverage table--from
 					 * beginning of LigCaretList table */
@@ -278,7 +278,7 @@ struct MarkGlyphSetsFormat1
     return TRACE_RETURN (coverage.sanitize (c, this));
   }
 
-  private:
+  protected:
   USHORT	format;			/* Format identifier--format = 1 */
   LongOffsetArrayOf<Coverage>
 		coverage;		/* Array of long offsets to mark set
@@ -306,7 +306,7 @@ struct MarkGlyphSets
     }
   }
 
-  private:
+  protected:
   union {
   USHORT		format;		/* Format identifier */
   MarkGlyphSetsFormat1	format1;
@@ -392,7 +392,7 @@ struct GDEF
   }
 
 
-  private:
+  protected:
   FixedVersion	version;		/* Version of the GDEF table--currently
 					 * 0x00010002 */
   OffsetTo<ClassDef>
diff --git a/src/hb-ot-layout-gpos-table.hh b/src/hb-ot-layout-gpos-table.hh
index 9eadbd6..e95aa3e 100644
--- a/src/hb-ot-layout-gpos-table.hh
+++ b/src/hb-ot-layout-gpos-table.hh
@@ -225,7 +225,7 @@ struct AnchorFormat1
     return TRACE_RETURN (c->check_struct (this));
   }
 
-  private:
+  protected:
   USHORT	format;			/* Format identifier--format = 1 */
   SHORT		xCoordinate;		/* Horizontal value--in design units */
   SHORT		yCoordinate;		/* Vertical value--in design units */
@@ -257,7 +257,7 @@ struct AnchorFormat2
     return TRACE_RETURN (c->check_struct (this));
   }
 
-  private:
+  protected:
   USHORT	format;			/* Format identifier--format = 2 */
   SHORT		xCoordinate;		/* Horizontal value--in design units */
   SHORT		yCoordinate;		/* Vertical value--in design units */
@@ -288,7 +288,7 @@ struct AnchorFormat3
     return TRACE_RETURN (c->check_struct (this) && xDeviceTable.sanitize (c, this) && yDeviceTable.sanitize (c, this));
   }
 
-  private:
+  protected:
   USHORT	format;			/* Format identifier--format = 3 */
   SHORT		xCoordinate;		/* Horizontal value--in design units */
   SHORT		yCoordinate;		/* Vertical value--in design units */
@@ -329,7 +329,7 @@ struct Anchor
     }
   }
 
-  private:
+  protected:
   union {
   USHORT		format;		/* Format identifier */
   AnchorFormat1		format1;
@@ -360,7 +360,7 @@ struct AnchorMatrix
   }
 
   USHORT	rows;			/* Number of rows */
-  private:
+  protected:
   OffsetTo<Anchor>
 		matrix[VAR];		/* Matrix of offsets to Anchor tables--
 					 * from beginning of AnchorMatrix table */
@@ -378,7 +378,7 @@ struct MarkRecord
     return TRACE_RETURN (c->check_struct (this) && markAnchor.sanitize (c, base));
   }
 
-  private:
+  protected:
   USHORT	klass;			/* Class defined for this mark */
   OffsetTo<Anchor>
 		markAnchor;		/* Offset to Anchor table--from
@@ -447,7 +447,7 @@ struct SinglePosFormat1
     return TRACE_RETURN (c->check_struct (this) && coverage.sanitize (c, this) && valueFormat.sanitize_value (c, this, values));
   }
 
-  private:
+  protected:
   USHORT	format;			/* Format identifier--format = 1 */
   OffsetTo<Coverage>
 		coverage;		/* Offset to Coverage table--from
@@ -487,7 +487,7 @@ struct SinglePosFormat2
     return TRACE_RETURN (c->check_struct (this) && coverage.sanitize (c, this) && valueFormat.sanitize_values (c, this, values, valueCount));
   }
 
-  private:
+  protected:
   USHORT	format;			/* Format identifier--format = 2 */
   OffsetTo<Coverage>
 		coverage;		/* Offset to Coverage table--from
@@ -526,7 +526,7 @@ struct SinglePos
     }
   }
 
-  private:
+  protected:
   union {
   USHORT		format;		/* Format identifier */
   SinglePosFormat1	format1;
@@ -539,7 +539,7 @@ struct PairValueRecord
 {
   friend struct PairSet;
 
-  private:
+  protected:
   GlyphID	secondGlyph;		/* GlyphID of second glyph in the
 					 * pair--first glyph is listed in the
 					 * Coverage table */
@@ -601,7 +601,7 @@ struct PairSet
 		      && closure->valueFormats[1].sanitize_values_stride_unsafe (c, closure->base, &record->values[closure->len1], count, closure->stride));
   }
 
-  private:
+  protected:
   USHORT	len;			/* Number of PairValueRecords */
   USHORT	array[VAR];		/* Array of PairValueRecords--ordered
 					 * by GlyphID of the second glyph */
@@ -643,7 +643,7 @@ struct PairPosFormat1
     return TRACE_RETURN (c->check_struct (this) && coverage.sanitize (c, this) && pairSet.sanitize (c, this, &closure));
   }
 
-  private:
+  protected:
   USHORT	format;			/* Format identifier--format = 1 */
   OffsetTo<Coverage>
 		coverage;		/* Offset to Coverage table--from
@@ -715,7 +715,7 @@ struct PairPosFormat2
 			 valueFormat2.sanitize_values_stride_unsafe (c, this, &values[len1], count, stride));
   }
 
-  private:
+  protected:
   USHORT	format;			/* Format identifier--format = 2 */
   OffsetTo<Coverage>
 		coverage;		/* Offset to Coverage table--from
@@ -770,7 +770,7 @@ struct PairPos
     }
   }
 
-  private:
+  protected:
   union {
   USHORT		format;		/* Format identifier */
   PairPosFormat1	format1;
@@ -788,7 +788,7 @@ struct EntryExitRecord
     return TRACE_RETURN (entryAnchor.sanitize (c, base) && exitAnchor.sanitize (c, base));
   }
 
-  private:
+  protected:
   OffsetTo<Anchor>
 		entryAnchor;		/* Offset to EntryAnchor table--from
 					 * beginning of CursivePos
@@ -893,7 +893,7 @@ struct CursivePosFormat1
     return TRACE_RETURN (coverage.sanitize (c, this) && entryExitRecord.sanitize (c, this));
   }
 
-  private:
+  protected:
   USHORT	format;			/* Format identifier--format = 1 */
   OffsetTo<Coverage>
 		coverage;		/* Offset to Coverage table--from
@@ -928,7 +928,7 @@ struct CursivePos
     }
   }
 
-  private:
+  protected:
   union {
   USHORT		format;		/* Format identifier */
   CursivePosFormat1	format1;
@@ -977,7 +977,7 @@ struct MarkBasePosFormat1
 			 markArray.sanitize (c, this) && baseArray.sanitize (c, this, (unsigned int) classCount));
   }
 
-  private:
+  protected:
   USHORT	format;			/* Format identifier--format = 1 */
   OffsetTo<Coverage>
 		markCoverage;		/* Offset to MarkCoverage table--from
@@ -1019,7 +1019,7 @@ struct MarkBasePos
     }
   }
 
-  private:
+  protected:
   union {
   USHORT		format;		/* Format identifier */
   MarkBasePosFormat1	format1;
@@ -1092,7 +1092,7 @@ struct MarkLigPosFormat1
 			 markArray.sanitize (c, this) && ligatureArray.sanitize (c, this, (unsigned int) classCount));
   }
 
-  private:
+  protected:
   USHORT	format;			/* Format identifier--format = 1 */
   OffsetTo<Coverage>
 		markCoverage;		/* Offset to Mark Coverage table--from
@@ -1135,7 +1135,7 @@ struct MarkLigPos
     }
   }
 
-  private:
+  protected:
   union {
   USHORT		format;		/* Format identifier */
   MarkLigPosFormat1	format1;
@@ -1189,7 +1189,7 @@ struct MarkMarkPosFormat1
 			 && mark2Array.sanitize (c, this, (unsigned int) classCount));
   }
 
-  private:
+  protected:
   USHORT	format;			/* Format identifier--format = 1 */
   OffsetTo<Coverage>
 		mark1Coverage;		/* Offset to Combining Mark1 Coverage
@@ -1233,7 +1233,7 @@ struct MarkMarkPos
     }
   }
 
-  private:
+  protected:
   union {
   USHORT		format;		/* Format identifier */
   MarkMarkPosFormat1	format1;
@@ -1359,7 +1359,7 @@ struct PosLookupSubTable
     }
   }
 
-  private:
+  protected:
   union {
   struct {
     USHORT			sub_format;
diff --git a/src/hb-ot-layout-gsub-table.hh b/src/hb-ot-layout-gsub-table.hh
index 007d21c..600a92a 100644
--- a/src/hb-ot-layout-gsub-table.hh
+++ b/src/hb-ot-layout-gsub-table.hh
@@ -75,7 +75,7 @@ struct SingleSubstFormat1
     return TRACE_RETURN (coverage.sanitize (c, this) && deltaGlyphID.sanitize (c));
   }
 
-  private:
+  protected:
   USHORT	format;			/* Format identifier--format = 1 */
   OffsetTo<Coverage>
 		coverage;		/* Offset to Coverage table--from
@@ -127,7 +127,7 @@ struct SingleSubstFormat2
     return TRACE_RETURN (coverage.sanitize (c, this) && substitute.sanitize (c));
   }
 
-  private:
+  protected:
   USHORT	format;			/* Format identifier--format = 2 */
   OffsetTo<Coverage>
 		coverage;		/* Offset to Coverage table--from
@@ -184,7 +184,7 @@ struct SingleSubst
     }
   }
 
-  private:
+  protected:
   union {
   USHORT		format;		/* Format identifier */
   SingleSubstFormat1	format1;
@@ -229,7 +229,7 @@ struct Sequence
     return TRACE_RETURN (substitute.sanitize (c));
   }
 
-  private:
+  protected:
   ArrayOf<GlyphID>
 		substitute;		/* String of GlyphIDs to substitute */
   public:
@@ -272,7 +272,7 @@ struct MultipleSubstFormat1
     return TRACE_RETURN (coverage.sanitize (c, this) && sequence.sanitize (c, this));
   }
 
-  private:
+  protected:
   USHORT	format;			/* Format identifier--format = 1 */
   OffsetTo<Coverage>
 		coverage;		/* Offset to Coverage table--from
@@ -325,7 +325,7 @@ struct MultipleSubst
     }
   }
 
-  private:
+  protected:
   union {
   USHORT		format;		/* Format identifier */
   MultipleSubstFormat1	format1;
@@ -394,7 +394,7 @@ struct AlternateSubstFormat1
     return TRACE_RETURN (coverage.sanitize (c, this) && alternateSet.sanitize (c, this));
   }
 
-  private:
+  protected:
   USHORT	format;			/* Format identifier--format = 1 */
   OffsetTo<Coverage>
 		coverage;		/* Offset to Coverage table--from
@@ -447,7 +447,7 @@ struct AlternateSubst
     }
   }
 
-  private:
+  protected:
   union {
   USHORT		format;		/* Format identifier */
   AlternateSubstFormat1	format1;
@@ -544,7 +544,7 @@ struct Ligature
     return TRACE_RETURN (ligGlyph.sanitize (c) && component.sanitize (c));
   }
 
-  private:
+  protected:
   GlyphID	ligGlyph;		/* GlyphID of ligature to substitute */
   HeadlessArrayOf<GlyphID>
 		component;		/* Array of component GlyphIDs--start
@@ -599,7 +599,7 @@ struct LigatureSet
     return TRACE_RETURN (ligature.sanitize (c, this));
   }
 
-  private:
+  protected:
   OffsetArrayOf<Ligature>
 		ligature;		/* Array LigatureSet tables
 					 * ordered by preference */
@@ -647,7 +647,7 @@ struct LigatureSubstFormat1
     return TRACE_RETURN (coverage.sanitize (c, this) && ligatureSet.sanitize (c, this));
   }
 
-  private:
+  protected:
   USHORT	format;			/* Format identifier--format = 1 */
   OffsetTo<Coverage>
 		coverage;		/* Offset to Coverage table--from
@@ -700,7 +700,7 @@ struct LigatureSubst
     }
   }
 
-  private:
+  protected:
   union {
   USHORT		format;		/* Format identifier */
   LigatureSubstFormat1	format1;
@@ -844,7 +844,7 @@ struct ReverseChainSingleSubstFormat1
     return TRACE_RETURN (substitute.sanitize (c));
   }
 
-  private:
+  protected:
   USHORT	format;			/* Format identifier--format = 1 */
   OffsetTo<Coverage>
 		coverage;		/* Offset to Coverage table--from
@@ -897,7 +897,7 @@ struct ReverseChainSingleSubst
     }
   }
 
-  private:
+  protected:
   union {
   USHORT				format;		/* Format identifier */
   ReverseChainSingleSubstFormat1	format1;
@@ -1013,7 +1013,7 @@ struct SubstLookupSubTable
     }
   }
 
-  private:
+  protected:
   union {
   struct {
     USHORT			sub_format;
diff --git a/src/hb-ot-layout-gsubgpos-private.hh b/src/hb-ot-layout-gsubgpos-private.hh
index d50c653..14d36b0 100644
--- a/src/hb-ot-layout-gsubgpos-private.hh
+++ b/src/hb-ot-layout-gsubgpos-private.hh
@@ -167,7 +167,7 @@ struct hb_apply_context_t
     }
 
     unsigned int idx;
-    private:
+    protected:
     hb_apply_context_t *c;
     unsigned int num_items;
     hb_mask_t mask;
@@ -216,7 +216,7 @@ struct hb_apply_context_t
     }
 
     unsigned int idx;
-    private:
+    protected:
     hb_apply_context_t *c;
     unsigned int num_items;
     hb_mask_t mask;
@@ -588,7 +588,7 @@ struct Rule
 			   + lookupRecordX[0].static_size * lookupCount);
   }
 
-  private:
+  protected:
   USHORT	inputCount;		/* Total number of glyphs in input
 					 * glyph sequence--includes the first
 					 * glyph */
@@ -640,7 +640,7 @@ struct RuleSet
     return TRACE_RETURN (rule.sanitize (c, this));
   }
 
-  private:
+  protected:
   OffsetArrayOf<Rule>
 		rule;			/* Array of Rule tables
 					 * ordered by preference */
@@ -709,7 +709,7 @@ struct ContextFormat1
     return TRACE_RETURN (coverage.sanitize (c, this) && ruleSet.sanitize (c, this));
   }
 
-  private:
+  protected:
   USHORT	format;			/* Format identifier--format = 1 */
   OffsetTo<Coverage>
 		coverage;		/* Offset to Coverage table--from
@@ -786,7 +786,7 @@ struct ContextFormat2
     return TRACE_RETURN (coverage.sanitize (c, this) && classDef.sanitize (c, this) && ruleSet.sanitize (c, this));
   }
 
-  private:
+  protected:
   USHORT	format;			/* Format identifier--format = 2 */
   OffsetTo<Coverage>
 		coverage;		/* Offset to Coverage table--from
@@ -864,7 +864,7 @@ struct ContextFormat3
     return TRACE_RETURN (c->check_array (lookupRecord, lookupRecord[0].static_size, lookupCount));
   }
 
-  private:
+  protected:
   USHORT	format;			/* Format identifier--format = 3 */
   USHORT	glyphCount;		/* Number of glyphs in the input glyph
 					 * sequence */
@@ -925,7 +925,7 @@ struct Context
     }
   }
 
-  private:
+  protected:
   union {
   USHORT		format;		/* Format identifier */
   ContextFormat1	format1;
@@ -1079,7 +1079,7 @@ struct ChainRule
     return TRACE_RETURN (lookup.sanitize (c));
   }
 
-  private:
+  protected:
   ArrayOf<USHORT>
 		backtrack;		/* Array of backtracking values
 					 * (to be matched before the input
@@ -1134,7 +1134,7 @@ struct ChainRuleSet
     return TRACE_RETURN (rule.sanitize (c, this));
   }
 
-  private:
+  protected:
   OffsetArrayOf<ChainRule>
 		rule;			/* Array of ChainRule tables
 					 * ordered by preference */
@@ -1199,7 +1199,7 @@ struct ChainContextFormat1
     return TRACE_RETURN (coverage.sanitize (c, this) && ruleSet.sanitize (c, this));
   }
 
-  private:
+  protected:
   USHORT	format;			/* Format identifier--format = 1 */
   OffsetTo<Coverage>
 		coverage;		/* Offset to Coverage table--from
@@ -1287,7 +1287,7 @@ struct ChainContextFormat2
 			 ruleSet.sanitize (c, this));
   }
 
-  private:
+  protected:
   USHORT	format;			/* Format identifier--format = 2 */
   OffsetTo<Coverage>
 		coverage;		/* Offset to Coverage table--from
@@ -1392,7 +1392,7 @@ struct ChainContextFormat3
     return TRACE_RETURN (lookup.sanitize (c));
   }
 
-  private:
+  protected:
   USHORT	format;			/* Format identifier--format = 3 */
   OffsetArrayOf<Coverage>
 		backtrack;		/* Array of coverage tables
@@ -1460,7 +1460,7 @@ struct ChainContext
     }
   }
 
-  private:
+  protected:
   union {
   USHORT		format;	/* Format identifier */
   ChainContextFormat1	format1;
@@ -1483,7 +1483,7 @@ struct ExtensionFormat1
     return TRACE_RETURN (c->check_struct (this));
   }
 
-  private:
+  protected:
   USHORT	format;			/* Format identifier. Set to 1. */
   USHORT	extensionLookupType;	/* Lookup type of subtable referenced
 					 * by ExtensionOffset (i.e. the
@@ -1520,7 +1520,7 @@ struct Extension
     }
   }
 
-  private:
+  protected:
   union {
   USHORT		format;		/* Format identifier */
   ExtensionFormat1	format1;
diff --git a/src/hb-ot-maxp-table.hh b/src/hb-ot-maxp-table.hh
index e270490..c2c90d1 100644
--- a/src/hb-ot-maxp-table.hh
+++ b/src/hb-ot-maxp-table.hh
@@ -52,7 +52,7 @@ struct maxp
   }
 
   /* We only implement version 0.5 as none of the extra fields in version 1.0 are useful. */
-  private:
+  protected:
   FixedVersion	version;		/* Version of the maxp table (0.5 or 1.0),
 					 * 0x00005000 or 0x00010000. */
   USHORT	numGlyphs;		/* The number of glyphs in the font. */
diff --git a/src/hb-ot-name-table.hh b/src/hb-ot-name-table.hh
index 9077c8c..e0d2e89 100644
--- a/src/hb-ot-name-table.hh
+++ b/src/hb-ot-name-table.hh
@@ -114,7 +114,7 @@ struct name
   }
 
   /* We only implement format 0 for now. */
-  private:
+  protected:
   USHORT	format;			/* Format selector (=0/1). */
   USHORT	count;			/* Number of name records. */
   Offset	stringOffset;		/* Offset to start of string storage (from start of table). */



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