text:
/*
 * Copyright © 2018  Ebrahim Byagowi
 *
 *  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.
 */

#ifndef HB_OT_H_IN
#error "Include <hb-ot.h> instead."
#endif

#ifndef HB_OT_METRICS_H
#define HB_OT_METRICS_H

#include "hb.h"
#include "hb-ot-name.h"

HB_BEGIN_DECLS

/**
 * hb_ot_metrics_tag_t:
 * @HB_OT_METRICS_TAG_HORIZONTAL_ASCENDER: horizontal ascender.
 * @HB_OT_METRICS_TAG_HORIZONTAL_DESCENDER: horizontal descender.
 * @HB_OT_METRICS_TAG_HORIZONTAL_LINE_GAP: horizontal line gap.
 * @HB_OT_METRICS_TAG_HORIZONTAL_CLIPPING_ASCENT: horizontal clipping ascent.
 * @HB_OT_METRICS_TAG_HORIZONTAL_CLIPPING_DESCENT: horizontal clipping descent.
 * @HB_OT_METRICS_TAG_VERTICAL_ASCENDER: vertical ascender.
 * @HB_OT_METRICS_TAG_VERTICAL_DESCENDER: vertical descender.
 * @HB_OT_METRICS_TAG_VERTICAL_LINE_GAP: vertical line gap.
 * @HB_OT_METRICS_TAG_HORIZONTAL_CARET_RISE: horizontal caret rise.
 * @HB_OT_METRICS_TAG_HORIZONTAL_CARET_RUN: horizontal caret run.
 * @HB_OT_METRICS_TAG_HORIZONTAL_CARET_OFFSET: horizontal caret offset.
 * @HB_OT_METRICS_TAG_VERTICAL_CARET_RISE: vertical caret rise.
 * @HB_OT_METRICS_TAG_VERTICAL_CARET_RUN: vertical caret run.
 * @HB_OT_METRICS_TAG_VERTICAL_CARET_OFFSET: vertical caret offset.
 * @HB_OT_METRICS_TAG_X_HEIGHT: x height.
 * @HB_OT_METRICS_TAG_CAP_HEIGHT: cap height.
 * @HB_OT_METRICS_TAG_SUBSCRIPT_EM_X_SIZE: subscript em x size.
 * @HB_OT_METRICS_TAG_SUBSCRIPT_EM_Y_SIZE: subscript em y size.
 * @HB_OT_METRICS_TAG_SUBSCRIPT_EM_X_OFFSET: subscript em x offset.
 * @HB_OT_METRICS_TAG_SUBSCRIPT_EM_Y_OFFSET: subscript em y offset.
 * @HB_OT_METRICS_TAG_SUPERSCRIPT_EM_X_SIZE: superscript em x size.
 * @HB_OT_METRICS_TAG_SUPERSCRIPT_EM_Y_SIZE: superscript em y size.
 * @HB_OT_METRICS_TAG_SUPERSCRIPT_EM_X_OFFSET: superscript em x offset.
 * @HB_OT_METRICS_TAG_SUPERSCRIPT_EM_Y_OFFSET: superscript em y offset.
 * @HB_OT_METRICS_TAG_STRIKEOUT_SIZE: strikeout size.
 * @HB_OT_METRICS_TAG_STRIKEOUT_OFFSET: strikeout offset.
 * @HB_OT_METRICS_TAG_UNDERLINE_SIZE: underline size.
 * @HB_OT_METRICS_TAG_UNDERLINE_OFFSET: underline offset.
 *
 * From https://docs.microsoft.com/en-us/typography/opentype/spec/mvar#value-tags
 *
 * Since: 2.6.0
 **/
typedef enum {
  HB_OT_METRICS_TAG_HORIZONTAL_ASCENDER		= HB_TAG ('h','a','s','c'),
  HB_OT_METRICS_TAG_HORIZONTAL_DESCENDER	= HB_TAG ('h','d','s','c'),
  HB_OT_METRICS_TAG_HORIZONTAL_LINE_GAP		= HB_TAG ('h','l','g','p'),
  HB_OT_METRICS_TAG_HORIZONTAL_CLIPPING_ASCENT	= HB_TAG ('h','c','l','a'),
  HB_OT_METRICS_TAG_HORIZONTAL_CLIPPING_DESCENT	= HB_TAG ('h','c','l','d'),
  HB_OT_METRICS_TAG_VERTICAL_ASCENDER		= HB_TAG ('v','a','s','c'),
  HB_OT_METRICS_TAG_VERTICAL_DESCENDER		= HB_TAG ('v','d','s','c'),
  HB_OT_METRICS_TAG_VERTICAL_LINE_GAP		= HB_TAG ('v','l','g','p'),
  HB_OT_METRICS_TAG_HORIZONTAL_CARET_RISE	= HB_TAG ('h','c','r','s'),
  HB_OT_METRICS_TAG_HORIZONTAL_CARET_RUN	= HB_TAG ('h','c','r','n'),
  HB_OT_METRICS_TAG_HORIZONTAL_CARET_OFFSET	= HB_TAG ('h','c','o','f'),
  HB_OT_METRICS_TAG_VERTICAL_CARET_RISE		= HB_TAG ('v','c','r','s'),
  HB_OT_METRICS_TAG_VERTICAL_CARET_RUN		= HB_TAG ('v','c','r','n'),
  HB_OT_METRICS_TAG_VERTICAL_CARET_OFFSET	= HB_TAG ('v','c','o','f'),
  HB_OT_METRICS_TAG_X_HEIGHT			= HB_TAG ('x','h','g','t'),
  HB_OT_METRICS_TAG_CAP_HEIGHT			= HB_TAG ('c','p','h','t'),
  HB_OT_METRICS_TAG_SUBSCRIPT_EM_X_SIZE		= HB_TAG ('s','b','x','s'),
  HB_OT_METRICS_TAG_SUBSCRIPT_EM_Y_SIZE		= HB_TAG ('s','b','y','s'),
  HB_OT_METRICS_TAG_SUBSCRIPT_EM_X_OFFSET	= HB_TAG ('s','b','x','o'),
  HB_OT_METRICS_TAG_SUBSCRIPT_EM_Y_OFFSET	= HB_TAG ('s','b','y','o'),
  HB_OT_METRICS_TAG_SUPERSCRIPT_EM_X_SIZE	= HB_TAG ('s','p','x','s'),
  HB_OT_METRICS_TAG_SUPERSCRIPT_EM_Y_SIZE	= HB_TAG ('s','p','y','s'),
  HB_OT_METRICS_TAG_SUPERSCRIPT_EM_X_OFFSET	= HB_TAG ('s','p','x','o'),
  HB_OT_METRICS_TAG_SUPERSCRIPT_EM_Y_OFFSET	= HB_TAG ('s','p','y','o'),
  HB_OT_METRICS_TAG_STRIKEOUT_SIZE		= HB_TAG ('s','t','r','s'),
  HB_OT_METRICS_TAG_STRIKEOUT_OFFSET		= HB_TAG ('s','t','r','o'),
  HB_OT_METRICS_TAG_UNDERLINE_SIZE		= HB_TAG ('u','n','d','s'),
  HB_OT_METRICS_TAG_UNDERLINE_OFFSET		= HB_TAG ('u','n','d','o'),

  _HB_OT_METRICS_TAG_MAX_VALUE = HB_TAG_MAX_SIGNED /*< skip >*/
} hb_ot_metrics_tag_t;

HB_EXTERN hb_bool_t
hb_ot_metrics_get_position (hb_font_t           *font,
			    hb_ot_metrics_tag_t  metrics_tag,
			    hb_position_t       *position     /* OUT.  May be NULL. */);

HB_EXTERN float
hb_ot_metrics_get_variation (hb_font_t *font, hb_ot_metrics_tag_t metrics_tag);

HB_EXTERN hb_position_t
hb_ot_metrics_get_x_variation (hb_font_t *font, hb_ot_metrics_tag_t metrics_tag);

HB_EXTERN hb_position_t
hb_ot_metrics_get_y_variation (hb_font_t *font, hb_ot_metrics_tag_t metrics_tag);

HB_END_DECLS

#endif /* HB_OT_METRICS_H */


text:
/*
 * Copyright © 2012,2013  Mozilla Foundation.
 * Copyright © 2012,2013  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.
 *
 * Mozilla Author(s): Jonathan Kew
 * Google Author(s): Behdad Esfahbod
 */

#include "hb.hh"

#ifdef HAVE_CORETEXT

#include "hb-shaper-impl.hh"

#include "hb-coretext.h"
#include "hb-aat-layout.hh"
#include <math.h>

/**
 * SECTION:hb-coretext
 * @title: hb-coretext
 * @short_description: CoreText integration
 * @include: hb-coretext.h
 *
 * Functions for using HarfBuzz with the CoreText fonts.
 **/

/* https://developer.apple.com/documentation/coretext/1508745-ctfontcreatewithgraphicsfont */
#define HB_CORETEXT_DEFAULT_FONT_SIZE 12.f

static void
release_table_data (void *user_data)
{
  CFDataRef cf_data = reinterpret_cast<CFDataRef> (user_data);
  CFRelease(cf_data);
}

static hb_blob_t *
_hb_cg_reference_table (hb_face_t *face HB_UNUSED, hb_tag_t tag, void *user_data)
{
  CGFontRef cg_font = reinterpret_cast<CGFontRef> (user_data);
  CFDataRef cf_data = CGFontCopyTableForTag (cg_font, tag);
  if (unlikely (!cf_data))
    return nullptr;

  const char *data = reinterpret_cast<const char*> (CFDataGetBytePtr (cf_data));
  const size_t length = CFDataGetLength (cf_data);
  if (!data || !length)
  {
    CFRelease (cf_data);
    return nullptr;
  }

  return hb_blob_create (data, length, HB_MEMORY_MODE_READONLY,
			 reinterpret_cast<void *> (const_cast<__CFData *> (cf_data)),
			 release_table_data);
}

static void
_hb_cg_font_release (void *data)
{
  CGFontRelease ((CGFontRef) data);
}

static CTFontDescriptorRef
get_last_resort_font_desc ()
{
  // TODO Handle allocation failures?
  CTFontDescriptorRef last_resort = CTFontDescriptorCreateWithNameAndSize (CFSTR("LastResort"), 0);
  CFArrayRef cascade_list = CFArrayCreate (kCFAllocatorDefault,
					   (const void **) &last_resort,
					   1,
					   &kCFTypeArrayCallBacks);
  CFRelease (last_resort);
  CFDictionaryRef attributes = CFDictionaryCreate (kCFAllocatorDefault,
						   (const void **) &kCTFontCascadeListAttribute,
						   (const void **) &cascade_list,
						   1,
						   &kCFTypeDictionaryKeyCallBacks,
						   &kCFTypeDictionaryValueCallBacks);
  CFRelease (cascade_list);

  CTFontDescriptorRef font_desc = CTFontDescriptorCreateWithAttributes (attributes);
  CFRelease (attributes);
  return font_desc;
}

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, nullptr) == data);

  hb_blob_destroy ((hb_blob_t *) info);
}

static CGFontRef
create_cg_font (hb_face_t *face)
{
  CGFontRef cg_font = nullptr;
  if (face->destroy == _hb_cg_font_release)
  {
    cg_font = CGFontRetain ((CGFontRef) face->user_data);
  }
  else
  {
    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);
    if (likely (provider))
    {
      cg_font = CGFontCreateWithDataProvider (provider);
      if (unlikely (!cg_font))
	DEBUG_MSG (CORETEXT, face, "Face CGFontCreateWithDataProvider() failed");
      CGDataProviderRelease (provider);
    }
  }
  return cg_font;
}

static CTFontRef
create_ct_font (CGFontRef cg_font, CGFloat font_size)
{
  CTFontRef ct_font = nullptr;

  /* CoreText does not enable trak table usage / tracking when creating a CTFont
   * using CTFontCreateWithGraphicsFont. The only way of enabling tracking seems
   * to be through the CTFontCreateUIFontForLanguage call. */
  CFStringRef cg_postscript_name = CGFontCopyPostScriptName (cg_font);
  if (CFStringHasPrefix (cg_postscript_name, CFSTR (".SFNSText")) ||
      CFStringHasPrefix (cg_postscript_name, CFSTR (".SFNSDisplay")))
  {
#if !(defined(TARGET_OS_IPHONE) && TARGET_OS_IPHONE) && MAC_OS_X_VERSION_MIN_REQUIRED < 1080
# define kCTFontUIFontSystem kCTFontSystemFontType
# define kCTFontUIFontEmphasizedSystem kCTFontEmphasizedSystemFontType
#endif
    CTFontUIFontType font_type = kCTFontUIFontSystem;
    if (CFStringHasSuffix (cg_postscript_name, CFSTR ("-Bold")))
      font_type = kCTFontUIFontEmphasizedSystem;

    ct_font = CTFontCreateUIFontForLanguage (font_type, font_size, nullptr);
    CFStringRef ct_result_name = CTFontCopyPostScriptName(ct_font);
    if (CFStringCompare (ct_result_name, cg_postscript_name, 0) != kCFCompareEqualTo)
    {
      CFRelease(ct_font);
      ct_font = nullptr;
    }
    CFRelease (ct_result_name);
  }
  CFRelease (cg_postscript_name);

  if (!ct_font)
    ct_font = CTFontCreateWithGraphicsFont (cg_font, font_size, nullptr, nullptr);

  if (unlikely (!ct_font)) {
    DEBUG_MSG (CORETEXT, cg_font, "Font CTFontCreateWithGraphicsFont() failed");
    return nullptr;
  }

  /* crbug.com/576941 and crbug.com/625902 and the investigation in the latter
   * bug indicate that the cascade list reconfiguration occasionally causes
   * crashes in CoreText on OS X 10.9, thus let's skip this step on older
   * operating system versions. Except for the emoji font, where _not_
   * reconfiguring the cascade list causes CoreText crashes. For details, see
   * crbug.com/549610 */
  // 0x00070000 stands for "kCTVersionNumber10_10", see CoreText.h
  if (&CTGetCoreTextVersion != nullptr && CTGetCoreTextVersion() < 0x00070000) {
    CFStringRef fontName = CTFontCopyPostScriptName (ct_font);
    bool isEmojiFont = CFStringCompare (fontName, CFSTR("AppleColorEmoji"), 0) == kCFCompareEqualTo;
    CFRelease (fontName);
    if (!isEmojiFont)
      return ct_font;
  }

  CFURLRef original_url = nullptr;
#if !(defined(TARGET_OS_IPHONE) && TARGET_OS_IPHONE) && MAC_OS_X_VERSION_MIN_REQUIRED < 1060
  ATSFontRef atsFont;
  FSRef fsref;
  OSStatus status;
  atsFont = CTFontGetPlatformFont (ct_font, NULL);
  status = ATSFontGetFileReference (atsFont, &fsref);
  if (status == noErr)
    original_url = CFURLCreateFromFSRef (NULL, &fsref);
#else
  original_url = (CFURLRef) CTFontCopyAttribute (ct_font, kCTFontURLAttribute);
#endif

  /* Create font copy with cascade list that has LastResort first; this speeds up CoreText
   * font fallback which we don't need anyway. */
  {
    CTFontDescriptorRef last_resort_font_desc = get_last_resort_font_desc ();
    CTFontRef new_ct_font = CTFontCreateCopyWithAttributes (ct_font, 0.0, nullptr, last_resort_font_desc);
    CFRelease (last_resort_font_desc);
    if (new_ct_font)
    {
      /* The CTFontCreateCopyWithAttributes call fails to stay on the same font
       * when reconfiguring the cascade list and may switch to a different font
       * when there are fonts that go by the same name, since the descriptor is
       * just name and size.
       *
       * Avoid reconfiguring the cascade lists if the new font is outside the
       * system locations that we cannot access from the sandboxed renderer
       * process in Blink. This can be detected by the new file URL location
       * that the newly found font points to. */
      CFURLRef new_url = nullptr;
#if !(defined(TARGET_OS_IPHONE) && TARGET_OS_IPHONE) && MAC_OS_X_VERSION_MIN_REQUIRED < 1060
      atsFont = CTFontGetPlatformFont (new_ct_font, NULL);
      status = ATSFontGetFileReference (atsFont, &fsref);
      if (status == noErr)
	new_url = CFURLCreateFromFSRef (NULL, &fsref);
#else
      new_url = (CFURLRef) CTFontCopyAttribute (new_ct_font, kCTFontURLAttribute);
#endif
      // Keep reconfigured font if URL cannot be retrieved (seems to be the case
      // on Mac OS 10.12 Sierra), speculative fix for crbug.com/625606
      if (!original_url || !new_url || CFEqual (original_url, new_url)) {
	CFRelease (ct_font);
	ct_font = new_ct_font;
      } else {
	CFRelease (new_ct_font);
	DEBUG_MSG (CORETEXT, ct_font, "Discarding reconfigured CTFont, location changed.");
      }
      if (new_url)
	CFRelease (new_url);
    }
    else
      DEBUG_MSG (CORETEXT, ct_font, "Font copy with empty cascade list failed");
  }

  if (original_url)
    CFRelease (original_url);
  return ct_font;
}

hb_coretext_face_data_t *
_hb_coretext_shaper_face_data_create (hb_face_t *face)
{
  CGFontRef cg_font = create_cg_font (face);

  if (unlikely (!cg_font))
  {
    DEBUG_MSG (CORETEXT, face, "CGFont creation failed..");
    return nullptr;
  }

  return (hb_coretext_face_data_t *) cg_font;
}

void
_hb_coretext_shaper_face_data_destroy (hb_coretext_face_data_t *data)
{
  CFRelease ((CGFontRef) data);
}

/**
 * hb_coretext_face_create:
 * @cg_font: The CGFontRef to work upon
 *
 * Creates an #hb_face_t face object from the specified
 * CGFontRef.
 *
 * Return value: the new #hb_face_t face object
 *
 * Since: 0.9.10
 */
hb_face_t *
hb_coretext_face_create (CGFontRef cg_font)
{
  return hb_face_create_for_tables (_hb_cg_reference_table, CGFontRetain (cg_font), _hb_cg_font_release);
}

/**
 * hb_coretext_face_get_cg_font:
 * @face: The #hb_face_t to work upon
 *
 * Fetches the CGFontRef associated with an #hb_face_t
 * face object
 *
 * Return value: the CGFontRef found
 *
 * Since: 0.9.10
 */
CGFontRef
hb_coretext_face_get_cg_font (hb_face_t *face)
{
  return (CGFontRef) (const void *) face->data.coretext;
}

hb_coretext_font_data_t *
_hb_coretext_shaper_font_data_create (hb_font_t *font)
{
  hb_face_t *face = font->face;
  const hb_coretext_face_data_t *face_data = face->data.coretext;
  if (unlikely (!face_data)) return nullptr;
  CGFontRef cg_font = (CGFontRef) (const void *) face->data.coretext;

  CGFloat font_size = (CGFloat) (font->ptem <= 0.f ? HB_CORETEXT_DEFAULT_FONT_SIZE : font->ptem);
  CTFontRef ct_font = create_ct_font (cg_font, font_size);

  if (unlikely (!ct_font))
  {
    DEBUG_MSG (CORETEXT, font, "CGFont creation failed..");
    return nullptr;
  }

  return (hb_coretext_font_data_t *) ct_font;
}

void
_hb_coretext_shaper_font_data_destroy (hb_coretext_font_data_t *data)
{
  CFRelease ((CTFontRef) data);
}

static const hb_coretext_font_data_t *
hb_coretext_font_data_sync (hb_font_t *font)
{
retry:
  const hb_coretext_font_data_t *data = font->data.coretext;
  if (unlikely (!data)) return nullptr;

  if (fabs (CTFontGetSize ((CTFontRef) data) - (CGFloat) font->ptem) > .5)
  {
    /* XXX-MT-bug
     * Note that evaluating condition above can be dangerous if another thread
     * got here first and destructed data.  That's, as always, bad use pattern.
     * If you modify the font (change font size), other threads must not be
     * using it at the same time.  However, since this check is delayed to
     * when one actually tries to shape something, this is a XXX race condition
     * (and the only one we have that I know of) right now.  Ie. you modify the
     * font size in one thread, then (supposedly safely) try to use it from two
     * or more threads and BOOM!  I'm not sure how to fix this.  We want RCU.
     */

    /* Drop and recreate. */
    /* If someone dropped it in the mean time, throw it away and don't touch it.
     * Otherwise, destruct it. */
    if (likely (font->data.coretext.cmpexch (const_cast<hb_coretext_font_data_t *> (data), nullptr)))
      _hb_coretext_shaper_font_data_destroy (const_cast<hb_coretext_font_data_t *> (data));
    else
      goto retry;
  }
  return font->data.coretext;
}

/**
 * hb_coretext_font_create:
 * @ct_font: The CTFontRef to work upon
 *
 * Creates an #hb_font_t font object from the specified
 * CTFontRef.
 *
 * Return value: the new #hb_font_t font object
 *
 * Since: 1.7.2
 **/
hb_font_t *
hb_coretext_font_create (CTFontRef ct_font)
{
  CGFontRef cg_font = CTFontCopyGraphicsFont (ct_font, nullptr);
  hb_face_t *face = hb_coretext_face_create (cg_font);
  CFRelease (cg_font);
  hb_font_t *font = hb_font_create (face);
  hb_face_destroy (face);

  if (unlikely (hb_object_is_immutable (font)))
    return font;

  hb_font_set_ptem (font, CTFontGetSize (ct_font));

  /* Let there be dragons here... */
  font->data.coretext.cmpexch (nullptr, (hb_coretext_font_data_t *) CFRetain (ct_font));

  return font;
}

/**
 * hb_coretext_face_get_ct_font:
 * @font: #hb_font_t to work upon
 *
 * Fetches the CTFontRef associated with the specified
 * #hb_font_t font object.
 *
 * Return value: the CTFontRef found
 *
 * Since: 0.9.10
 */
CTFontRef
hb_coretext_font_get_ct_font (hb_font_t *font)
{
  const hb_coretext_font_data_t *data = hb_coretext_font_data_sync (font);
  return data ? (CTFontRef) data : nullptr;
}

/*
 * shaper
 */

struct feature_record_t {
  unsigned int feature;
  unsigned int setting;
};

struct active_feature_t {
  feature_record_t rec;
  unsigned int order;

  HB_INTERNAL static int cmp (const void *pa, const void *pb) {
    const active_feature_t *a = (const active_feature_t *) pa;
    const active_feature_t *b = (const active_feature_t *) pb;
    return a->rec.feature < b->rec.feature ? -1 : a->rec.feature > b->rec.feature ? 1 :
	   a->order < b->order ? -1 : a->order > b->order ? 1 :
	   a->rec.setting < b->rec.setting ? -1 : a->rec.setting > b->rec.setting ? 1 :
	   0;
  }
  bool operator== (const active_feature_t *f) {
    return cmp (this, f) == 0;
  }
};

struct feature_event_t {
  unsigned int index;
  bool start;
  active_feature_t feature;

  HB_INTERNAL static int cmp (const void *pa, const void *pb) {
    const feature_event_t *a = (const feature_event_t *) pa;
    const feature_event_t *b = (const feature_event_t *) pb;
    return a->index < b->index ? -1 : a->index > b->index ? 1 :
	   a->start < b->start ? -1 : a->start > b->start ? 1 :
	   active_feature_t::cmp (&a->feature, &b->feature);
  }
};

struct range_record_t {
  CTFontRef font;
  unsigned int index_first; /* == start */
  unsigned int index_last;  /* == end - 1 */
};

hb_bool_t
_hb_coretext_shape (hb_shape_plan_t    *shape_plan,
		    hb_font_t          *font,
		    hb_buffer_t        *buffer,
		    const hb_feature_t *features,
		    unsigned int        num_features)
{
  hb_face_t *face = font->face;
  CGFontRef cg_font = (CGFontRef) (const void *) face->data.coretext;
  CTFontRef ct_font = (CTFontRef) hb_coretext_font_data_sync (font);

  CGFloat ct_font_size = CTFontGetSize (ct_font);
  CGFloat x_mult = (CGFloat) font->x_scale / ct_font_size;
  CGFloat y_mult = (CGFloat) font->y_scale / ct_font_size;

  /* Attach marks to their bases, to match the 'ot' shaper.
   * Adapted from a very old version of hb-ot-shape:hb_form_clusters().
   * Note that this only makes us be closer to the 'ot' shaper,
   * but by no means the same.  For example, if there's
   * B1 M1 B2 M2, and B1-B2 form a ligature, M2's cluster will
   * continue pointing to B2 even though B2 was merged into B1's
   * cluster... */
  if (buffer->cluster_level == HB_BUFFER_CLUSTER_LEVEL_MONOTONE_GRAPHEMES)
  {
    hb_unicode_funcs_t *unicode = buffer->unicode;
    unsigned int count = buffer->len;
    hb_glyph_info_t *info = buffer->info;
    for (unsigned int i = 1; i < count; i++)
      if (HB_UNICODE_GENERAL_CATEGORY_IS_MARK (unicode->general_category (info[i].codepoint)))
	buffer->merge_clusters (i - 1, i + 1);
  }

  hb_vector_t<feature_record_t> feature_records;
  hb_vector_t<range_record_t> range_records;

  /*
   * Set up features.
   * (copied + modified from code from hb-uniscribe.cc)
   */
  if (num_features)
  {
    /* Sort features by start/end events. */
    hb_vector_t<feature_event_t> feature_events;
    for (unsigned int i = 0; i < num_features; i++)
    {
      active_feature_t feature;

#if MAC_OS_X_VERSION_MIN_REQUIRED < 1010
      const hb_aat_feature_mapping_t * mapping = hb_aat_layout_find_feature_mapping (features[i].tag);
      if (!mapping)
	continue;

      feature.rec.feature = mapping->aatFeatureType;
      feature.rec.setting = features[i].value ? mapping->selectorToEnable : mapping->selectorToDisable;
#else
      feature.rec.feature = features[i].tag;
      feature.rec.setting = features[i].value;
#endif
      feature.order = i;

      feature_event_t *event;

      event = feature_events.push ();
      event->index = features[i].start;
      event->start = true;
      event->feature = feature;

      event = feature_events.push ();
      event->index = features[i].end;
      event->start = false;
      event->feature = feature;
    }
    feature_events.qsort ();
    /* Add a strategic final event. */
    {
      active_feature_t feature;
      feature.rec.feature = HB_TAG_NONE;
      feature.rec.setting = 0;
      feature.order = num_features + 1;

      feature_event_t *event = feature_events.push ();
      event->index = 0; /* This value does magic. */
      event->start = false;
      event->feature = feature;
    }

    /* Scan events and save features for each range. */
    hb_vector_t<active_feature_t> active_features;
    unsigned int last_index = 0;
    for (unsigned int i = 0; i < feature_events.length; i++)
    {
      feature_event_t *event = &feature_events[i];

      if (event->index != last_index)
      {
	/* Save a snapshot of active features and the range. */
	range_record_t *range = range_records.push ();

	if (active_features.length)
	{
	  CFMutableArrayRef features_array = CFArrayCreateMutable(kCFAllocatorDefault, 0, &kCFTypeArrayCallBacks);

	  /* TODO sort and resolve conflicting features? */
	  /* active_features.qsort (); */
	  for (unsigned int j = 0; j < active_features.length; j++)
	  {
#if MAC_OS_X_VERSION_MIN_REQUIRED < 1010
	    CFStringRef keys[] = {
	      kCTFontFeatureTypeIdentifierKey,
	      kCTFontFeatureSelectorIdentifierKey
	    };
	    CFNumberRef values[] = {
	      CFNumberCreate (kCFAllocatorDefault, kCFNumberIntType, &active_features[j].rec.feature),
	      CFNumberCreate (kCFAllocatorDefault, kCFNumberIntType, &active_features[j].rec.setting)
	    };
#else
	    char tag[5] = {HB_UNTAG (active_features[j].rec.feature)};
	    CFTypeRef keys[] = {
	      kCTFontOpenTypeFeatureTag,
	      kCTFontOpenTypeFeatureValue
	    };
	    CFTypeRef values[] = {
	      CFStringCreateWithCString (kCFAllocatorDefault, tag, kCFStringEncodingASCII),
	      CFNumberCreate (kCFAllocatorDefault, kCFNumberIntType, &active_features[j].rec.setting)
	    };
#endif
	    static_assert ((ARRAY_LENGTH_CONST (keys) == ARRAY_LENGTH_CONST (values)), "");
	    CFDictionaryRef dict = CFDictionaryCreate (kCFAllocatorDefault,
						       (const void **) keys,
						       (const void **) values,
						       ARRAY_LENGTH (keys),
						       &kCFTypeDictionaryKeyCallBacks,
						       &kCFTypeDictionaryValueCallBacks);
	    for (unsigned int i = 0; i < ARRAY_LENGTH (values); i++)
	      CFRelease (values[i]);

	    CFArrayAppendValue (features_array, dict);
	    CFRelease (dict);

	  }

	  CFDictionaryRef attributes = CFDictionaryCreate (kCFAllocatorDefault,
							   (const void **) &kCTFontFeatureSettingsAttribute,
							   (const void **) &features_array,
							   1,
							   &kCFTypeDictionaryKeyCallBacks,
							   &kCFTypeDictionaryValueCallBacks);
	  CFRelease (features_array);

	  CTFontDescriptorRef font_desc = CTFontDescriptorCreateWithAttributes (attributes);
	  CFRelease (attributes);

	  range->font = CTFontCreateCopyWithAttributes (ct_font, 0.0, nullptr, font_desc);
	  CFRelease (font_desc);
	}
	else
	{
	  range->font = nullptr;
	}

	range->index_first = last_index;
	range->index_last  = event->index - 1;

	last_index = event->index;
      }

      if (event->start)
      {
	active_features.push (event->feature);
      } else {
	active_feature_t *feature = active_features.find (&event->feature);
	if (feature)
	  active_features.remove (feature - active_features.arrayZ);
      }
    }
  }

  unsigned int scratch_size;
  hb_buffer_t::scratch_buffer_t *scratch = buffer->get_scratch_buffer (&scratch_size);

#define ALLOCATE_ARRAY(Type, name, len, on_no_room) \
  Type *name = (Type *) scratch; \
  do { \
    unsigned int _consumed = DIV_CEIL ((len) * sizeof (Type), sizeof (*scratch)); \
    if (unlikely (_consumed > scratch_size)) \
    { \
      on_no_room; \
      assert (0); \
    } \
    scratch += _consumed; \
    scratch_size -= _consumed; \
  } while (0)

  ALLOCATE_ARRAY (UniChar, pchars, buffer->len * 2, ((void)nullptr) /*nothing*/);
  unsigned int chars_len = 0;
  for (unsigned int i = 0; i < buffer->len; i++) {
    hb_codepoint_t c = buffer->info[i].codepoint;
    if (likely (c <= 0xFFFFu))
      pchars[chars_len++] = c;
    else if (unlikely (c > 0x10FFFFu))
      pchars[chars_len++] = 0xFFFDu;
    else {
      pchars[chars_len++] = 0xD800u + ((c - 0x10000u) >> 10);
      pchars[chars_len++] = 0xDC00u + ((c - 0x10000u) & ((1u << 10) - 1));
    }
  }

  ALLOCATE_ARRAY (unsigned int, log_clusters, chars_len, ((void)nullptr) /*nothing*/);
  chars_len = 0;
  for (unsigned int i = 0; i < buffer->len; i++)
  {
    hb_codepoint_t c = buffer->info[i].codepoint;
    unsigned int cluster = buffer->info[i].cluster;
    log_clusters[chars_len++] = cluster;
    if (hb_in_range (c, 0x10000u, 0x10FFFFu))
      log_clusters[chars_len++] = cluster; /* Surrogates. */
  }

#define FAIL(...) \
  HB_STMT_START { \
    DEBUG_MSG (CORETEXT, nullptr, __VA_ARGS__); \
    ret = false; \
    goto fail; \
  } HB_STMT_END

  bool ret = true;
  CFStringRef string_ref = nullptr;
  CTLineRef line = nullptr;

  if (false)
  {
resize_and_retry:
    DEBUG_MSG (CORETEXT, buffer, "Buffer resize");
    /* string_ref uses the scratch-buffer for backing store, and line references
     * string_ref (via attr_string).  We must release those before resizing buffer. */
    assert (string_ref);
    assert (line);
    CFRelease (string_ref);
    CFRelease (line);
    string_ref = nullptr;
    line = nullptr;

    /* Get previous start-of-scratch-area, that we use later for readjusting
     * our existing scratch arrays. */
    unsigned int old_scratch_used;
    hb_buffer_t::scratch_buffer_t *old_scratch;
    old_scratch = buffer->get_scratch_buffer (&old_scratch_used);
    old_scratch_used = scratch - old_scratch;

    if (unlikely (!buffer->ensure (buffer->allocated * 2)))
      FAIL ("Buffer resize failed");

    /* Adjust scratch, pchars, and log_cluster arrays.  This is ugly, but really the
     * cleanest way to do without completely restructuring the rest of this shaper. */
    scratch = buffer->get_scratch_buffer (&scratch_size);
    pchars = reinterpret_cast<UniChar *> (((char *) scratch + ((char *) pchars - (char *) old_scratch)));
    log_clusters = reinterpret_cast<unsigned int *> (((char *) scratch + ((char *) log_clusters - (char *) old_scratch)));
    scratch += old_scratch_used;
    scratch_size -= old_scratch_used;
  }
  {
    string_ref = CFStringCreateWithCharactersNoCopy (nullptr,
						     pchars, chars_len,
						     kCFAllocatorNull);
    if (unlikely (!string_ref))
      FAIL ("CFStringCreateWithCharactersNoCopy failed");

    /* Create an attributed string, populate it, and create a line from it, then release attributed string. */
    {
      CFMutableAttributedStringRef attr_string = CFAttributedStringCreateMutable (kCFAllocatorDefault,
										  chars_len);
      if (unlikely (!attr_string))
	FAIL ("CFAttributedStringCreateMutable failed");
      CFAttributedStringReplaceString (attr_string, CFRangeMake (0, 0), string_ref);
      if (HB_DIRECTION_IS_VERTICAL (buffer->props.direction))
      {
	CFAttributedStringSetAttribute (attr_string, CFRangeMake (0, chars_len),
					kCTVerticalFormsAttributeName, kCFBooleanTrue);
      }

      if (buffer->props.language)
      {
/* What's the iOS equivalent of this check?
 * The symbols was introduced in iOS 7.0.
 * At any rate, our fallback is safe and works fine. */
#if !(defined(TARGET_OS_IPHONE) && TARGET_OS_IPHONE) && MAC_OS_X_VERSION_MIN_REQUIRED < 1090
#  define kCTLanguageAttributeName CFSTR ("NSLanguage")
#endif
	CFStringRef lang = CFStringCreateWithCStringNoCopy (kCFAllocatorDefault,
							    hb_language_to_string (buffer->props.language),
							    kCFStringEncodingUTF8,
							    kCFAllocatorNull);
	if (unlikely (!lang))
	{
	  CFRelease (attr_string);
	  FAIL ("CFStringCreateWithCStringNoCopy failed");
	}
	CFAttributedStringSetAttribute (attr_string, CFRangeMake (0, chars_len),
					kCTLanguageAttributeName, lang);
	CFRelease (lang);
      }
      CFAttributedStringSetAttribute (attr_string, CFRangeMake (0, chars_len),
				      kCTFontAttributeName, ct_font);

      if (num_features && range_records.length)
      {
	unsigned int start = 0;
	range_record_t *last_range = &range_records[0];
	for (unsigned int k = 0; k < chars_len; k++)
	{
	  range_record_t *range = last_range;
	  while (log_clusters[k] < range->index_first)
	    range--;
	  while (log_clusters[k] > range->index_last)
	    range++;
	  if (range != last_range)
	  {
	    if (last_range->font)
	      CFAttributedStringSetAttribute (attr_string, CFRangeMake (start, k - start),
					      kCTFontAttributeName, last_range->font);

	    start = k;
	  }

	  last_range = range;
	}
	if (start != chars_len && last_range->font)
	  CFAttributedStringSetAttribute (attr_string, CFRangeMake (start, chars_len - start),
					  kCTFontAttributeName, last_range->font);
      }
      /* Enable/disable kern if requested.
       *
       * Note: once kern is disabled, reenabling it doesn't currently seem to work in CoreText.
       */
      if (num_features)
      {
	unsigned int zeroint = 0;
	CFNumberRef zero = CFNumberCreate (kCFAllocatorDefault, kCFNumberIntType, &zeroint);
	for (unsigned int i = 0; i < num_features; i++)
	{
	  const hb_feature_t &feature = features[i];
	  if (feature.tag == HB_TAG('k','e','r','n') &&
	      feature.start < chars_len && feature.start < feature.end)
	  {
	    CFRange feature_range = CFRangeMake (feature.start,
						 hb_min (feature.end, chars_len) - feature.start);
	    if (feature.value)
	      CFAttributedStringRemoveAttribute (attr_string, feature_range, kCTKernAttributeName);
	    else
	      CFAttributedStringSetAttribute (attr_string, feature_range, kCTKernAttributeName, zero);
	  }
	}
	CFRelease (zero);
      }

      int level = HB_DIRECTION_IS_FORWARD (buffer->props.direction) ? 0 : 1;
      CFNumberRef level_number = CFNumberCreate (kCFAllocatorDefault, kCFNumberIntType, &level);
#if !(defined(TARGET_OS_IPHONE) && TARGET_OS_IPHONE) && MAC_OS_X_VERSION_MIN_REQUIRED < 1060
      extern const CFStringRef kCTTypesetterOptionForcedEmbeddingLevel;
#endif
      CFDictionaryRef options = CFDictionaryCreate (kCFAllocatorDefault,
						    (const void **) &kCTTypesetterOptionForcedEmbeddingLevel,
						    (const void **) &level_number,
						    1,
						    &kCFTypeDictionaryKeyCallBacks,
						    &kCFTypeDictionaryValueCallBacks);
      CFRelease (level_number);
      if (unlikely (!options))
      {
	CFRelease (attr_string);
	FAIL ("CFDictionaryCreate failed");
      }

      CTTypesetterRef typesetter = CTTypesetterCreateWithAttributedStringAndOptions (attr_string, options);
      CFRelease (options);
      CFRelease (attr_string);
      if (unlikely (!typesetter))
	FAIL ("CTTypesetterCreateWithAttributedStringAndOptions failed");

      line = CTTypesetterCreateLine (typesetter, CFRangeMake(0, 0));
      CFRelease (typesetter);
      if (unlikely (!line))
	FAIL ("CTTypesetterCreateLine failed");
    }

    CFArrayRef glyph_runs = CTLineGetGlyphRuns (line);
    unsigned int num_runs = CFArrayGetCount (glyph_runs);
    DEBUG_MSG (CORETEXT, nullptr, "Num runs: %d", num_runs);

    buffer->len = 0;
    uint32_t status_and = ~0, status_or = 0;
    double advances_so_far = 0;
    /* For right-to-left runs, CoreText returns the glyphs positioned such that
     * any trailing whitespace is to the left of (0,0).  Adjust coordinate system
     * to fix for that.  Test with any RTL string with trailing spaces.
     * https://crbug.com/469028
     */
    if (HB_DIRECTION_IS_BACKWARD (buffer->props.direction))
    {
      advances_so_far -= CTLineGetTrailingWhitespaceWidth (line);
      if (HB_DIRECTION_IS_VERTICAL (buffer->props.direction))
	  advances_so_far = -advances_so_far;
    }

    const CFRange range_all = CFRangeMake (0, 0);

    for (unsigned int i = 0; i < num_runs; i++)
    {
      CTRunRef run = static_cast<CTRunRef>(CFArrayGetValueAtIndex (glyph_runs, i));
      CTRunStatus run_status = CTRunGetStatus (run);
      status_or  |= run_status;
      status_and &= run_status;
      DEBUG_MSG (CORETEXT, run, "CTRunStatus: %x", run_status);
      double run_advance = CTRunGetTypographicBounds (run, range_all, nullptr, nullptr, nullptr);
      if (HB_DIRECTION_IS_VERTICAL (buffer->props.direction))
	  run_advance = -run_advance;
      DEBUG_MSG (CORETEXT, run, "Run advance: %g", run_advance);

      /* CoreText does automatic font fallback (AKA "cascading") for  characters
       * not supported by the requested font, and provides no way to turn it off,
       * so we must detect if the returned run uses a font other than the requested
       * one and fill in the buffer with .notdef glyphs instead of random glyph
       * indices from a different font.
       */
      CFDictionaryRef attributes = CTRunGetAttributes (run);
      CTFontRef run_ct_font = static_cast<CTFontRef>(CFDictionaryGetValue (attributes, kCTFontAttributeName));
      if (!CFEqual (run_ct_font, ct_font))
      {
	/* The run doesn't use our main font instance.  We have to figure out
	 * whether font fallback happened, or this is just CoreText giving us
	 * another CTFont using the same underlying CGFont.  CoreText seems
	 * to do that in a variety of situations, one of which being vertical
	 * text, but also perhaps for caching reasons.
	 *
	 * First, see if it uses any of our subfonts created to set font features...
	 *
	 * Next, compare the CGFont to the one we used to create our fonts.
	 * Even this doesn't work all the time.
	 *
	 * Finally, we compare PS names, which I don't think are unique...
	 *
	 * Looks like if we really want to be sure here we have to modify the
	 * font to change the name table, similar to what we do in the uniscribe
	 * backend.
	 *
	 * However, even that wouldn't work if we were passed in the CGFont to
	 * construct a hb_face to begin with.
	 *
	 * See: https://github.com/harfbuzz/harfbuzz/pull/36
	 *
	 * Also see: https://bugs.chromium.org/p/chromium/issues/detail?id=597098
	 */
	bool matched = false;
	for (unsigned int i = 0; i < range_records.length; i++)
	  if (range_records[i].font && CFEqual (run_ct_font, range_records[i].font))
	  {
	    matched = true;
	    break;
	  }
	if (!matched)
	{
	  CGFontRef run_cg_font = CTFontCopyGraphicsFont (run_ct_font, nullptr);
	  if (run_cg_font)
	  {
	    matched = CFEqual (run_cg_font, cg_font);
	    CFRelease (run_cg_font);
	  }
	}
	if (!matched)
	{
	  CFStringRef font_ps_name = CTFontCopyName (ct_font, kCTFontPostScriptNameKey);
	  CFStringRef run_ps_name = CTFontCopyName (run_ct_font, kCTFontPostScriptNameKey);
	  CFComparisonResult result = CFStringCompare (run_ps_name, font_ps_name, 0);
	  CFRelease (run_ps_name);
	  CFRelease (font_ps_name);
	  if (result == kCFCompareEqualTo)
	    matched = true;
	}
	if (!matched)
	{
	  CFRange range = CTRunGetStringRange (run);
	  DEBUG_MSG (CORETEXT, run, "Run used fallback font: %ld..%ld",
		     range.location, range.location + range.length);
	  if (!buffer->ensure_inplace (buffer->len + range.length))
	    goto resize_and_retry;
	  hb_glyph_info_t *info = buffer->info + buffer->len;

	  hb_codepoint_t notdef = 0;
	  hb_direction_t dir = buffer->props.direction;
	  hb_position_t x_advance, y_advance, x_offset, y_offset;
	  hb_font_get_glyph_advance_for_direction (font, notdef, dir, &x_advance, &y_advance);
	  hb_font_get_glyph_origin_for_direction (font, notdef, dir, &x_offset, &y_offset);
	  hb_position_t advance = x_advance + y_advance;
	  x_offset = -x_offset;
	  y_offset = -y_offset;

	  unsigned int old_len = buffer->len;
	  for (CFIndex j = range.location; j < range.location + range.length; j++)
	  {
	      UniChar ch = CFStringGetCharacterAtIndex (string_ref, j);
	      if (hb_in_range<UniChar> (ch, 0xDC00u, 0xDFFFu) && range.location < j)
	      {
		ch = CFStringGetCharacterAtIndex (string_ref, j - 1);
		if (hb_in_range<UniChar> (ch, 0xD800u, 0xDBFFu))
		  /* This is the second of a surrogate pair.  Don't need .notdef
		   * for this one. */
		  continue;
	      }
	      if (buffer->unicode->is_default_ignorable (ch))
		continue;

	      info->codepoint = notdef;
	      info->cluster = log_clusters[j];

	      info->mask = advance;
	      info->var1.i32 = x_offset;
	      info->var2.i32 = y_offset;

	      info++;
	      buffer->len++;
	  }
	  if (HB_DIRECTION_IS_BACKWARD (buffer->props.direction))
	    buffer->reverse_range (old_len, buffer->len);
	  advances_so_far += run_advance;
	  continue;
	}
      }

      unsigned int num_glyphs = CTRunGetGlyphCount (run);
      if (num_glyphs == 0)
	continue;

      if (!buffer->ensure_inplace (buffer->len + num_glyphs))
	goto resize_and_retry;

      hb_glyph_info_t *run_info = buffer->info + buffer->len;

      /* Testing used to indicate that CTRunGetGlyphsPtr, etc (almost?) always
       * succeed, and so copying data to our own buffer will be rare.  Reports
       * have it that this changed in OS X 10.10 Yosemite, and nullptr is returned
       * frequently.  At any rate, we can test that codepath by setting USE_PTR
       * to false. */

#define USE_PTR true

#define SCRATCH_SAVE() \
  unsigned int scratch_size_saved = scratch_size; \
  hb_buffer_t::scratch_buffer_t *scratch_saved = scratch

#define SCRATCH_RESTORE() \
  scratch_size = scratch_size_saved; \
  scratch = scratch_saved

      { /* Setup glyphs */
	SCRATCH_SAVE();
	const CGGlyph* glyphs = USE_PTR ? CTRunGetGlyphsPtr (run) : nullptr;
	if (!glyphs) {
	  ALLOCATE_ARRAY (CGGlyph, glyph_buf, num_glyphs, goto resize_and_retry);
	  CTRunGetGlyphs (run, range_all, glyph_buf);
	  glyphs = glyph_buf;
	}
	const CFIndex* string_indices = USE_PTR ? CTRunGetStringIndicesPtr (run) : nullptr;
	if (!string_indices) {
	  ALLOCATE_ARRAY (CFIndex, index_buf, num_glyphs, goto resize_and_retry);
	  CTRunGetStringIndices (run, range_all, index_buf);
	  string_indices = index_buf;
	}
	hb_glyph_info_t *info = run_info;
	for (unsigned int j = 0; j < num_glyphs; j++)
	{
	  info->codepoint = glyphs[j];
	  info->cluster = log_clusters[string_indices[j]];
	  info++;
	}
	SCRATCH_RESTORE();
      }
      {
	/* Setup positions.
	 * Note that CoreText does not return advances for glyphs.  As such,
	 * for all but last glyph, we use the delta position to next glyph as
	 * advance (in the advance direction only), and for last glyph we set
	 * whatever is needed to make the whole run's advance add up. */
	SCRATCH_SAVE();
	const CGPoint* positions = USE_PTR ? CTRunGetPositionsPtr (run) : nullptr;
	if (!positions) {
	  ALLOCATE_ARRAY (CGPoint, position_buf, num_glyphs, goto resize_and_retry);
	  CTRunGetPositions (run, range_all, position_buf);
	  positions = position_buf;
	}
	hb_glyph_info_t *info = run_info;
	if (HB_DIRECTION_IS_HORIZONTAL (buffer->props.direction))
	{
	  hb_position_t x_offset = (positions[0].x - advances_so_far) * x_mult;
	  for (unsigned int j = 0; j < num_glyphs; j++)
	  {
	    double advance;
	    if (likely (j + 1 < num_glyphs))
	      advance = positions[j + 1].x - positions[j].x;
	    else /* last glyph */
	      advance = run_advance - (positions[j].x - positions[0].x);
	    info->mask = advance * x_mult;
	    info->var1.i32 = x_offset;
	    info->var2.i32 = positions[j].y * y_mult;
	    info++;
	  }
	}
	else
	{
	  hb_position_t y_offset = (positions[0].y - advances_so_far) * y_mult;
	  for (unsigned int j = 0; j < num_glyphs; j++)
	  {
	    double advance;
	    if (likely (j + 1 < num_glyphs))
	      advance = positions[j + 1].y - positions[j].y;
	    else /* last glyph */
	      advance = run_advance - (positions[j].y - positions[0].y);
	    info->mask = advance * y_mult;
	    info->var1.i32 = positions[j].x * x_mult;
	    info->var2.i32 = y_offset;
	    info++;
	  }
	}
	SCRATCH_RESTORE();
	advances_so_far += run_advance;
      }
#undef SCRATCH_RESTORE
#undef SCRATCH_SAVE
#undef USE_PTR
#undef ALLOCATE_ARRAY

      buffer->len += num_glyphs;
    }

    /* Mac OS 10.6 doesn't have kCTTypesetterOptionForcedEmbeddingLevel,
     * or if it does, it doesn't respect it.  So we get runs with wrong
     * directions.  As such, disable the assert...  It wouldn't crash, but
     * cursoring will be off...
     *
     * https://crbug.com/419769
     */
    if (false)
    {
      /* Make sure all runs had the expected direction. */
      HB_UNUSED bool backward = HB_DIRECTION_IS_BACKWARD (buffer->props.direction);
      assert (bool (status_and & kCTRunStatusRightToLeft) == backward);
      assert (bool (status_or  & kCTRunStatusRightToLeft) == backward);
    }

    buffer->clear_positions ();

    unsigned int count = buffer->len;
    hb_glyph_info_t *info = buffer->info;
    hb_glyph_position_t *pos = buffer->pos;
    if (HB_DIRECTION_IS_HORIZONTAL (buffer->props.direction))
      for (unsigned int i = 0; i < count; i++)
      {
	pos->x_advance = info->mask;
	pos->x_offset = info->var1.i32;
	pos->y_offset = info->var2.i32;

	info++, pos++;
      }
    else
      for (unsigned int i = 0; i < count; i++)
      {
	pos->y_advance = info->mask;
	pos->x_offset = info->var1.i32;
	pos->y_offset = info->var2.i32;

	info++, pos++;
      }

    /* Fix up clusters so that we never return out-of-order indices;
     * if core text has reordered glyphs, we'll merge them to the
     * beginning of the reordered cluster.  CoreText is nice enough
     * to tell us whenever it has produced nonmonotonic results...
     * Note that we assume the input clusters were nonmonotonic to
     * begin with.
     *
     * This does *not* mean we'll form the same clusters as Uniscribe
     * or the native OT backend, only that the cluster indices will be
     * monotonic in the output buffer. */
    if (count > 1 && (status_or & kCTRunStatusNonMonotonic))
    {
      hb_glyph_info_t *info = buffer->info;
      if (HB_DIRECTION_IS_FORWARD (buffer->props.direction))
      {
	unsigned int cluster = info[count - 1].cluster;
	for (unsigned int i = count - 1; i > 0; i--)
	{
	  cluster = hb_min (cluster, info[i - 1].cluster);
	  info[i - 1].cluster = cluster;
	}
      }
      else
      {
	unsigned int cluster = info[0].cluster;
	for (unsigned int i = 1; i < count; i++)
	{
	  cluster = hb_min (cluster, info[i].cluster);
	  info[i].cluster = cluster;
	}
      }
    }
  }

  buffer->unsafe_to_break_all ();

#undef FAIL

fail:
  if (string_ref)
    CFRelease (string_ref);
  if (line)
    CFRelease (line);

  for (unsigned int i = 0; i < range_records.length; i++)
    if (range_records[i].font)
      CFRelease (range_records[i].font);

  return ret;
}

#endif

repo_language: C

mime_type: text/x-c


text:
/*
 * Copyright © 2010,2011  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.
 *
 * Google Author(s): Behdad Esfahbod
 */

#include "hb.hh"

#include "hb.h"

#include <stdio.h>

#ifdef HAVE_FREETYPE
#include "hb-ft.h"
#endif

#ifdef HB_NO_OPEN
#define hb_blob_create_from_file(x)  hb_blob_get_empty ()
#endif

int
main (int argc, char **argv)
{
  if (argc != 2) {
    fprintf (stderr, "usage: %s font-file.ttf\n", argv[0]);
    exit (1);
  }

  hb_blob_t *blob = hb_blob_create_from_file (argv[1]);
  printf ("Opened font file %s: %u bytes long\n", argv[1], hb_blob_get_length (blob));

  /* Create the face */
  hb_face_t *face = hb_face_create (blob, 0 /* first face */);
  hb_blob_destroy (blob);
  blob = nullptr;
  unsigned int upem = hb_face_get_upem (face);

  hb_font_t *font = hb_font_create (face);
  hb_font_set_scale (font, upem, upem);

#ifdef HAVE_FREETYPE
  hb_ft_font_set_funcs (font);
#endif

  hb_buffer_t *buffer = hb_buffer_create ();

  hb_buffer_add_utf8 (buffer, "\xe0\xa4\x95\xe0\xa5\x8d\xe0\xa4\xb0\xe0\xa5\x8d\xe0\xa4\x95", -1, 0, -1);
  hb_buffer_guess_segment_properties (buffer);

  hb_shape (font, buffer, nullptr, 0);

  unsigned int count = hb_buffer_get_length (buffer);
  hb_glyph_info_t *infos = hb_buffer_get_glyph_infos (buffer, nullptr);
  hb_glyph_position_t *positions = hb_buffer_get_glyph_positions (buffer, nullptr);

  for (unsigned int i = 0; i < count; i++)
  {
    hb_glyph_info_t *info = &infos[i];
    hb_glyph_position_t *pos = &positions[i];

    printf ("cluster %d	glyph 0x%x at	(%d,%d)+(%d,%d)\n",
	    info->cluster,
	    info->codepoint,
	    pos->x_offset,
	    pos->y_offset,
	    pos->x_advance,
	    pos->y_advance);

  }

  hb_buffer_destroy (buffer);
  hb_font_destroy (font);
  hb_face_destroy (face);

  return 0;
}


text:
/*
 * Copyright © 2009  Red Hat, Inc.
 * Copyright © 2009  Keith Stribley
 * Copyright © 2015  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
 */

#include "hb.hh"

#ifdef HAVE_FREETYPE

#include "hb-ft.h"

#include "hb-font.hh"
#include "hb-machinery.hh"
#include "hb-cache.hh"

#include FT_ADVANCES_H
#include FT_MULTIPLE_MASTERS_H
#include FT_TRUETYPE_TABLES_H

/**
 * SECTION:hb-ft
 * @title: hb-ft
 * @short_description: FreeType integration
 * @include: hb-ft.h
 *
 * Functions for using HarfBuzz with the FreeType library.
 *
 * HarfBuzz supports using FreeType to provide face and
 * font data.
 *
 * <note>Note that FreeType is not thread-safe, therefore these
 * functions are not thread-safe either.</note>
 **/

/* TODO:
 *
 * In general, this file does a fine job of what it's supposed to do.
 * There are, however, things that need more work:
 *
 *   - FreeType works in 26.6 mode.  Clients can decide to use that mode, and everything
 *     would work fine.  However, we also abuse this API for performing in font-space,
 *     but don't pass the correct flags to FreeType.  We just abuse the no-hinting mode
 *     for that, such that no rounding etc happens.  As such, we don't set ppem, and
 *     pass NO_HINTING as load_flags.  Would be much better to use NO_SCALE, and scale
 *     ourselves.
 *
 *   - We don't handle / allow for emboldening / obliqueing.
 *
 *   - In the future, we should add constructors to create fonts in font space?
 */

struct hb_ft_font_t
{
  mutable hb_mutex_t lock;
  FT_Face ft_face;
  int load_flags;
  bool symbol; /* Whether selected cmap is symbol cmap. */
  bool unref; /* Whether to destroy ft_face when done. */

  mutable hb_atomic_int_t cached_x_scale;
  mutable hb_advance_cache_t advance_cache;
};

static hb_ft_font_t *
_hb_ft_font_create (FT_Face ft_face, bool symbol, bool unref)
{
  hb_ft_font_t *ft_font = (hb_ft_font_t *) calloc (1, sizeof (hb_ft_font_t));

  if (unlikely (!ft_font))
    return nullptr;

  ft_font->lock.init ();
  ft_font->ft_face = ft_face;
  ft_font->symbol = symbol;
  ft_font->unref = unref;

  ft_font->load_flags = FT_LOAD_DEFAULT | FT_LOAD_NO_HINTING;

  ft_font->cached_x_scale.set_relaxed (0);
  ft_font->advance_cache.init ();

  return ft_font;
}

static void
_hb_ft_face_destroy (void *data)
{
  FT_Done_Face ((FT_Face) data);
}

static void
_hb_ft_font_destroy (void *data)
{
  hb_ft_font_t *ft_font = (hb_ft_font_t *) data;

  ft_font->advance_cache.fini ();

  if (ft_font->unref)
    _hb_ft_face_destroy (ft_font->ft_face);

  ft_font->lock.fini ();

  free (ft_font);
}

/**
 * hb_ft_font_set_load_flags:
 * @font: #hb_font_t to work upon
 * @load_flags: The FreeType load flags to set
 *
 * Sets the FT_Load_Glyph load flags for the specified #hb_font_t.
 *
 * For more information, see
 * https://www.freetype.org/freetype2/docs/reference/ft2-base_interface.html#ft_load_xxx
 *
 * Since: 1.0.5
 **/
void
hb_ft_font_set_load_flags (hb_font_t *font, int load_flags)
{
  if (hb_object_is_immutable (font))
    return;

  if (unlikely (font->destroy != (hb_destroy_func_t) _hb_ft_font_destroy))
    return;

  hb_ft_font_t *ft_font = (hb_ft_font_t *) font->user_data;

  ft_font->load_flags = load_flags;
}

/**
 * hb_ft_font_get_load_flags:
 * @font: #hb_font_t to work upon
 *
 * Fetches the FT_Load_Glyph load flags of the specified #hb_font_t.
 *
 * For more information, see
 * https://www.freetype.org/freetype2/docs/reference/ft2-base_interface.html#ft_load_xxx
 *
 * Return value: FT_Load_Glyph flags found
 *
 * Since: 1.0.5
 **/
int
hb_ft_font_get_load_flags (hb_font_t *font)
{
  if (unlikely (font->destroy != (hb_destroy_func_t) _hb_ft_font_destroy))
    return 0;

  const hb_ft_font_t *ft_font = (const hb_ft_font_t *) font->user_data;

  return ft_font->load_flags;
}

/**
 * hb_ft_get_face:
 * @font: #hb_font_t to work upon
 *
 * Fetches the FT_Face associated with the specified #hb_font_t
 * font object.
 *
 * Return value: the FT_Face found
 *
 * Since: 0.9.2
 **/
FT_Face
hb_ft_font_get_face (hb_font_t *font)
{
  if (unlikely (font->destroy != (hb_destroy_func_t) _hb_ft_font_destroy))
    return nullptr;

  const hb_ft_font_t *ft_font = (const hb_ft_font_t *) font->user_data;

  return ft_font->ft_face;
}

/**
 * hb_ft_font_lock_face:
 * @font:
 *
 *
 *
 * Return value:
 * Since: 2.6.5
 **/
FT_Face
hb_ft_font_lock_face (hb_font_t *font)
{
  if (unlikely (font->destroy != (hb_destroy_func_t) _hb_ft_font_destroy))
    return nullptr;

  const hb_ft_font_t *ft_font = (const hb_ft_font_t *) font->user_data;

  ft_font->lock.lock ();

  return ft_font->ft_face;
}

/**
 * hb_ft_font_unlock_face:
 * @font:
 *
 *
 *
 * Return value:
 * Since: 2.6.5
 **/
void
hb_ft_font_unlock_face (hb_font_t *font)
{
  if (unlikely (font->destroy != (hb_destroy_func_t) _hb_ft_font_destroy))
    return;

  const hb_ft_font_t *ft_font = (const hb_ft_font_t *) font->user_data;

  ft_font->lock.unlock ();
}

static hb_bool_t
hb_ft_get_nominal_glyph (hb_font_t *font HB_UNUSED,
			 void *font_data,
			 hb_codepoint_t unicode,
			 hb_codepoint_t *glyph,
			 void *user_data HB_UNUSED)
{
  const hb_ft_font_t *ft_font = (const hb_ft_font_t *) font_data;
  hb_lock_t lock (ft_font->lock);
  unsigned int g = FT_Get_Char_Index (ft_font->ft_face, unicode);

  if (unlikely (!g))
  {
    if (unlikely (ft_font->symbol) && unicode <= 0x00FFu)
    {
      /* For symbol-encoded OpenType fonts, we duplicate the
       * U+F000..F0FF range at U+0000..U+00FF.  That's what
       * Windows seems to do, and that's hinted about at:
       * https://docs.microsoft.com/en-us/typography/opentype/spec/recom
       * under "Non-Standard (Symbol) Fonts". */
      g = FT_Get_Char_Index (ft_font->ft_face, 0xF000u + unicode);
      if (!g)
	return false;
    }
    else
      return false;
  }

  *glyph = g;
  return true;
}

static unsigned int
hb_ft_get_nominal_glyphs (hb_font_t *font HB_UNUSED,
			  void *font_data,
			  unsigned int count,
			  const hb_codepoint_t *first_unicode,
			  unsigned int unicode_stride,
			  hb_codepoint_t *first_glyph,
			  unsigned int glyph_stride,
			  void *user_data HB_UNUSED)
{
  const hb_ft_font_t *ft_font = (const hb_ft_font_t *) font_data;
  hb_lock_t lock (ft_font->lock);
  unsigned int done;
  for (done = 0;
       done < count && (*first_glyph = FT_Get_Char_Index (ft_font->ft_face, *first_unicode));
       done++)
  {
    first_unicode = &StructAtOffsetUnaligned<hb_codepoint_t> (first_unicode, unicode_stride);
    first_glyph = &StructAtOffsetUnaligned<hb_codepoint_t> (first_glyph, glyph_stride);
  }
  /* We don't need to do ft_font->symbol dance here, since HB calls the singular
   * nominal_glyph() for what we don't handle here. */
  return done;
}

static hb_bool_t
hb_ft_get_variation_glyph (hb_font_t *font HB_UNUSED,
			   void *font_data,
			   hb_codepoint_t unicode,
			   hb_codepoint_t variation_selector,
			   hb_codepoint_t *glyph,
			   void *user_data HB_UNUSED)
{
  const hb_ft_font_t *ft_font = (const hb_ft_font_t *) font_data;
  hb_lock_t lock (ft_font->lock);
  unsigned int g = FT_Face_GetCharVariantIndex (ft_font->ft_face, unicode, variation_selector);

  if (unlikely (!g))
    return false;

  *glyph = g;
  return true;
}

static void
hb_ft_get_glyph_h_advances (hb_font_t* font, void* font_data,
			    unsigned count,
			    const hb_codepoint_t *first_glyph,
			    unsigned glyph_stride,
			    hb_position_t *first_advance,
			    unsigned advance_stride,
			    void *user_data HB_UNUSED)
{
  const hb_ft_font_t *ft_font = (const hb_ft_font_t *) font_data;
  hb_lock_t lock (ft_font->lock);
  FT_Face ft_face = ft_font->ft_face;
  int load_flags = ft_font->load_flags;
  int mult = font->x_scale < 0 ? -1 : +1;

  if (font->x_scale != ft_font->cached_x_scale.get ())
  {
    ft_font->advance_cache.clear ();
    ft_font->cached_x_scale.set (font->x_scale);
  }

  for (unsigned int i = 0; i < count; i++)
  {
    FT_Fixed v = 0;
    hb_codepoint_t glyph = *first_glyph;

    unsigned int cv;
    if (ft_font->advance_cache.get (glyph, &cv))
      v = cv;
    else
    {
      FT_Get_Advance (ft_face, glyph, load_flags, &v);
      ft_font->advance_cache.set (glyph, v);
    }

    *first_advance = (v * mult + (1<<9)) >> 10;
    first_glyph = &StructAtOffsetUnaligned<hb_codepoint_t> (first_glyph, glyph_stride);
    first_advance = &StructAtOffsetUnaligned<hb_position_t> (first_advance, advance_stride);
  }
}

static hb_position_t
hb_ft_get_glyph_v_advance (hb_font_t *font,
			   void *font_data,
			   hb_codepoint_t glyph,
			   void *user_data HB_UNUSED)
{
  const hb_ft_font_t *ft_font = (const hb_ft_font_t *) font_data;
  hb_lock_t lock (ft_font->lock);
  FT_Fixed v;

  if (unlikely (FT_Get_Advance (ft_font->ft_face, glyph, ft_font->load_flags | FT_LOAD_VERTICAL_LAYOUT, &v)))
    return 0;

  if (font->y_scale < 0)
    v = -v;

  /* Note: FreeType's vertical metrics grows downward while other FreeType coordinates
   * have a Y growing upward.  Hence the extra negation. */
  return (-v + (1<<9)) >> 10;
}

static hb_bool_t
hb_ft_get_glyph_v_origin (hb_font_t *font,
			  void *font_data,
			  hb_codepoint_t glyph,
			  hb_position_t *x,
			  hb_position_t *y,
			  void *user_data HB_UNUSED)
{
  const hb_ft_font_t *ft_font = (const hb_ft_font_t *) font_data;
  hb_lock_t lock (ft_font->lock);
  FT_Face ft_face = ft_font->ft_face;

  if (unlikely (FT_Load_Glyph (ft_face, glyph, ft_font->load_flags)))
    return false;

  /* Note: FreeType's vertical metrics grows downward while other FreeType coordinates
   * have a Y growing upward.  Hence the extra negation. */
  *x = ft_face->glyph->metrics.horiBearingX -   ft_face->glyph->metrics.vertBearingX;
  *y = ft_face->glyph->metrics.horiBearingY - (-ft_face->glyph->metrics.vertBearingY);

  if (font->x_scale < 0)
    *x = -*x;
  if (font->y_scale < 0)
    *y = -*y;

  return true;
}

#ifndef HB_NO_OT_SHAPE_FALLBACK
static hb_position_t
hb_ft_get_glyph_h_kerning (hb_font_t *font,
			   void *font_data,
			   hb_codepoint_t left_glyph,
			   hb_codepoint_t right_glyph,
			   void *user_data HB_UNUSED)
{
  const hb_ft_font_t *ft_font = (const hb_ft_font_t *) font_data;
  FT_Vector kerningv;

  FT_Kerning_Mode mode = font->x_ppem ? FT_KERNING_DEFAULT : FT_KERNING_UNFITTED;
  if (FT_Get_Kerning (ft_font->ft_face, left_glyph, right_glyph, mode, &kerningv))
    return 0;

  return kerningv.x;
}
#endif

static hb_bool_t
hb_ft_get_glyph_extents (hb_font_t *font,
			 void *font_data,
			 hb_codepoint_t glyph,
			 hb_glyph_extents_t *extents,
			 void *user_data HB_UNUSED)
{
  const hb_ft_font_t *ft_font = (const hb_ft_font_t *) font_data;
  hb_lock_t lock (ft_font->lock);
  FT_Face ft_face = ft_font->ft_face;

  if (unlikely (FT_Load_Glyph (ft_face, glyph, ft_font->load_flags)))
    return false;

  extents->x_bearing = ft_face->glyph->metrics.horiBearingX;
  extents->y_bearing = ft_face->glyph->metrics.horiBearingY;
  extents->width = ft_face->glyph->metrics.width;
  extents->height = -ft_face->glyph->metrics.height;
  if (font->x_scale < 0)
  {
    extents->x_bearing = -extents->x_bearing;
    extents->width = -extents->width;
  }
  if (font->y_scale < 0)
  {
    extents->y_bearing = -extents->y_bearing;
    extents->height = -extents->height;
  }
  return true;
}

static hb_bool_t
hb_ft_get_glyph_contour_point (hb_font_t *font HB_UNUSED,
			       void *font_data,
			       hb_codepoint_t glyph,
			       unsigned int point_index,
			       hb_position_t *x,
			       hb_position_t *y,
			       void *user_data HB_UNUSED)
{
  const hb_ft_font_t *ft_font = (const hb_ft_font_t *) font_data;
  hb_lock_t lock (ft_font->lock);
  FT_Face ft_face = ft_font->ft_face;

  if (unlikely (FT_Load_Glyph (ft_face, glyph, ft_font->load_flags)))
      return false;

  if (unlikely (ft_face->glyph->format != FT_GLYPH_FORMAT_OUTLINE))
      return false;

  if (unlikely (point_index >= (unsigned int) ft_face->glyph->outline.n_points))
      return false;

  *x = ft_face->glyph->outline.points[point_index].x;
  *y = ft_face->glyph->outline.points[point_index].y;

  return true;
}

static hb_bool_t
hb_ft_get_glyph_name (hb_font_t *font HB_UNUSED,
		      void *font_data,
		      hb_codepoint_t glyph,
		      char *name, unsigned int size,
		      void *user_data HB_UNUSED)
{
  const hb_ft_font_t *ft_font = (const hb_ft_font_t *) font_data;
  hb_lock_t lock (ft_font->lock);
  FT_Face ft_face = ft_font->ft_face;

  hb_bool_t ret = !FT_Get_Glyph_Name (ft_face, glyph, name, size);
  if (ret && (size && !*name))
    ret = false;

  return ret;
}

static hb_bool_t
hb_ft_get_glyph_from_name (hb_font_t *font HB_UNUSED,
			   void *font_data,
			   const char *name, int len, /* -1 means nul-terminated */
			   hb_codepoint_t *glyph,
			   void *user_data HB_UNUSED)
{
  const hb_ft_font_t *ft_font = (const hb_ft_font_t *) font_data;
  hb_lock_t lock (ft_font->lock);
  FT_Face ft_face = ft_font->ft_face;

  if (len < 0)
    *glyph = FT_Get_Name_Index (ft_face, (FT_String *) name);
  else {
    /* Make a nul-terminated version. */
    char buf[128];
    len = hb_min (len, (int) sizeof (buf) - 1);
    strncpy (buf, name, len);
    buf[len] = '\0';
    *glyph = FT_Get_Name_Index (ft_face, buf);
  }

  if (*glyph == 0)
  {
    /* Check whether the given name was actually the name of glyph 0. */
    char buf[128];
    if (!FT_Get_Glyph_Name(ft_face, 0, buf, sizeof (buf)) &&
	len < 0 ? !strcmp (buf, name) : !strncmp (buf, name, len))
      return true;
  }

  return *glyph != 0;
}

static hb_bool_t
hb_ft_get_font_h_extents (hb_font_t *font HB_UNUSED,
			  void *font_data,
			  hb_font_extents_t *metrics,
			  void *user_data HB_UNUSED)
{
  const hb_ft_font_t *ft_font = (const hb_ft_font_t *) font_data;
  hb_lock_t lock (ft_font->lock);
  FT_Face ft_face = ft_font->ft_face;
  metrics->ascender = FT_MulFix(ft_face->ascender, ft_face->size->metrics.y_scale);
  metrics->descender = FT_MulFix(ft_face->descender, ft_face->size->metrics.y_scale);
  metrics->line_gap = FT_MulFix( ft_face->height, ft_face->size->metrics.y_scale ) - (metrics->ascender - metrics->descender);
  if (font->y_scale < 0)
  {
    metrics->ascender = -metrics->ascender;
    metrics->descender = -metrics->descender;
    metrics->line_gap = -metrics->line_gap;
  }
  return true;
}

#if HB_USE_ATEXIT
static void free_static_ft_funcs ();
#endif

static struct hb_ft_font_funcs_lazy_loader_t : hb_font_funcs_lazy_loader_t<hb_ft_font_funcs_lazy_loader_t>
{
  static hb_font_funcs_t *create ()
  {
    hb_font_funcs_t *funcs = hb_font_funcs_create ();

    hb_font_funcs_set_font_h_extents_func (funcs, hb_ft_get_font_h_extents, nullptr, nullptr);
    //hb_font_funcs_set_font_v_extents_func (funcs, hb_ft_get_font_v_extents, nullptr, nullptr);
    hb_font_funcs_set_nominal_glyph_func (funcs, hb_ft_get_nominal_glyph, nullptr, nullptr);
    hb_font_funcs_set_nominal_glyphs_func (funcs, hb_ft_get_nominal_glyphs, nullptr, nullptr);
    hb_font_funcs_set_variation_glyph_func (funcs, hb_ft_get_variation_glyph, nullptr, nullptr);
    hb_font_funcs_set_glyph_h_advances_func (funcs, hb_ft_get_glyph_h_advances, nullptr, nullptr);
    hb_font_funcs_set_glyph_v_advance_func (funcs, hb_ft_get_glyph_v_advance, nullptr, nullptr);
    //hb_font_funcs_set_glyph_h_origin_func (funcs, hb_ft_get_glyph_h_origin, nullptr, nullptr);
    hb_font_funcs_set_glyph_v_origin_func (funcs, hb_ft_get_glyph_v_origin, nullptr, nullptr);
#ifndef HB_NO_OT_SHAPE_FALLBACK
    hb_font_funcs_set_glyph_h_kerning_func (funcs, hb_ft_get_glyph_h_kerning, nullptr, nullptr);
#endif
    //hb_font_funcs_set_glyph_v_kerning_func (funcs, hb_ft_get_glyph_v_kerning, nullptr, nullptr);
    hb_font_funcs_set_glyph_extents_func (funcs, hb_ft_get_glyph_extents, nullptr, nullptr);
    hb_font_funcs_set_glyph_contour_point_func (funcs, hb_ft_get_glyph_contour_point, nullptr, nullptr);
    hb_font_funcs_set_glyph_name_func (funcs, hb_ft_get_glyph_name, nullptr, nullptr);
    hb_font_funcs_set_glyph_from_name_func (funcs, hb_ft_get_glyph_from_name, nullptr, nullptr);

    hb_font_funcs_make_immutable (funcs);

#if HB_USE_ATEXIT
    atexit (free_static_ft_funcs);
#endif

    return funcs;
  }
} static_ft_funcs;

#if HB_USE_ATEXIT
static
void free_static_ft_funcs ()
{
  static_ft_funcs.free_instance ();
}
#endif

static hb_font_funcs_t *
_hb_ft_get_font_funcs ()
{
  return static_ft_funcs.get_unconst ();
}

static void
_hb_ft_font_set_funcs (hb_font_t *font, FT_Face ft_face, bool unref)
{
  bool symbol = ft_face->charmap && ft_face->charmap->encoding == FT_ENCODING_MS_SYMBOL;

  hb_font_set_funcs (font,
		     _hb_ft_get_font_funcs (),
		     _hb_ft_font_create (ft_face, symbol, unref),
		     _hb_ft_font_destroy);
}

static hb_blob_t *
_hb_ft_reference_table (hb_face_t *face HB_UNUSED, hb_tag_t tag, void *user_data)
{
  FT_Face ft_face = (FT_Face) user_data;
  FT_Byte *buffer;
  FT_ULong  length = 0;
  FT_Error error;

  /* Note: FreeType like HarfBuzz uses the NONE tag for fetching the entire blob */

  error = FT_Load_Sfnt_Table (ft_face, tag, 0, nullptr, &length);
  if (error)
    return nullptr;

  buffer = (FT_Byte *) malloc (length);
  if (!buffer)
    return nullptr;

  error = FT_Load_Sfnt_Table (ft_face, tag, 0, buffer, &length);
  if (error)
  {
    free (buffer);
    return nullptr;
  }

  return hb_blob_create ((const char *) buffer, length,
			 HB_MEMORY_MODE_WRITABLE,
			 buffer, free);
}

/**
 * hb_ft_face_create:
 * @ft_face: (destroy destroy) (scope notified): FT_Face to work upon
 * @destroy: A callback to call when the face object is not needed anymore
 *
 * Creates an #hb_face_t face object from the specified FT_Face.
 *
 * This variant of the function does not provide any life-cycle management.
 *
 * Most client programs should use hb_ft_face_create_referenced()
 * (or, perhaps, hb_ft_face_create_cached()) instead.
 *
 * If you know you have valid reasons not to use hb_ft_face_create_referenced(),
 * then it is the client program's responsibility to destroy @ft_face
 * after the #hb_face_t face object has been destroyed.
 *
 * Return value: (transfer full): the new #hb_face_t face object
 *
 * Since: 0.9.2
 **/
hb_face_t *
hb_ft_face_create (FT_Face           ft_face,
		   hb_destroy_func_t destroy)
{
  hb_face_t *face;

  if (!ft_face->stream->read) {
    hb_blob_t *blob;

    blob = hb_blob_create ((const char *) ft_face->stream->base,
			   (unsigned int) ft_face->stream->size,
			   HB_MEMORY_MODE_READONLY,
			   ft_face, destroy);
    face = hb_face_create (blob, ft_face->face_index);
    hb_blob_destroy (blob);
  } else {
    face = hb_face_create_for_tables (_hb_ft_reference_table, ft_face, destroy);
  }

  hb_face_set_index (face, ft_face->face_index);
  hb_face_set_upem (face, ft_face->units_per_EM);

  return face;
}

/**
 * hb_ft_face_create_referenced:
 * @ft_face: FT_Face to work upon
 *
 * Creates an #hb_face_t face object from the specified FT_Face.
 *
 * This is the preferred variant of the hb_ft_face_create*
 * function family, because it calls FT_Reference_Face() on @ft_face,
 * ensuring that @ft_face remains alive as long as the resulting
 * #hb_face_t face object remains alive. Also calls FT_Done_Face()
 * when the #hb_face_t face object is destroyed.
 *
 * Use this version unless you know you have good reasons not to.
 *
 * Return value: (transfer full): the new #hb_face_t face object
 *
 * Since: 0.9.38
 **/
hb_face_t *
hb_ft_face_create_referenced (FT_Face ft_face)
{
  FT_Reference_Face (ft_face);
  return hb_ft_face_create (ft_face, _hb_ft_face_destroy);
}

static void
hb_ft_face_finalize (FT_Face ft_face)
{
  hb_face_destroy ((hb_face_t *) ft_face->generic.data);
}

/**
 * hb_ft_face_create_cached:
 * @ft_face: FT_Face to work upon
 *
 * Creates an #hb_face_t face object from the specified FT_Face.
 *
 * This variant of the function caches the newly created #hb_face_t
 * face object, using the @generic pointer of @ft_face. Subsequent function
 * calls that are passed the same @ft_face parameter will have the same
 * #hb_face_t returned to them, and that #hb_face_t will be correctly
 * reference counted.
 *
 * However, client programs are still responsible for destroying
 * @ft_face after the last #hb_face_t face object has been destroyed.
 *
 * Return value: (transfer full): the new #hb_face_t face object
 *
 * Since: 0.9.2
 **/
hb_face_t *
hb_ft_face_create_cached (FT_Face ft_face)
{
  if (unlikely (!ft_face->generic.data || ft_face->generic.finalizer != (FT_Generic_Finalizer) hb_ft_face_finalize))
  {
    if (ft_face->generic.finalizer)
      ft_face->generic.finalizer (ft_face);

    ft_face->generic.data = hb_ft_face_create (ft_face, nullptr);
    ft_face->generic.finalizer = (FT_Generic_Finalizer) hb_ft_face_finalize;
  }

  return hb_face_reference ((hb_face_t *) ft_face->generic.data);
}

/**
 * hb_ft_font_create:
 * @ft_face: (destroy destroy) (scope notified): FT_Face to work upon
 * @destroy: (optional): A callback to call when the font object is not needed anymore
 *
 * Creates an #hb_font_t font object from the specified FT_Face.
 *
 * <note>Note: You must set the face size on @ft_face before calling
 * hb_ft_font_create() on it. Otherwise, HarfBuzz will not pick up
 * the face size.</note>
 *
 * This variant of the function does not provide any life-cycle management.
 *
 * Most client programs should use hb_ft_font_create_referenced()
 * instead.
 *
 * If you know you have valid reasons not to use hb_ft_font_create_referenced(),
 * then it is the client program's responsibility to destroy @ft_face
 * after the #hb_font_t font object has been destroyed.
 *
 * HarfBuzz will use the @destroy callback on the #hb_font_t font object
 * if it is supplied when you use this function. However, even if @destroy
 * is provided, it is the client program's responsibility to destroy @ft_face,
 * and it is the client program's responsibility to ensure that @ft_face is
 * destroyed only after the #hb_font_t font object has been destroyed.
 *
 * Return value: (transfer full): the new #hb_font_t font object
 *
 * Since: 0.9.2
 **/
hb_font_t *
hb_ft_font_create (FT_Face           ft_face,
		   hb_destroy_func_t destroy)
{
  hb_font_t *font;
  hb_face_t *face;

  face = hb_ft_face_create (ft_face, destroy);
  font = hb_font_create (face);
  hb_face_destroy (face);
  _hb_ft_font_set_funcs (font, ft_face, false);
  hb_ft_font_changed (font);
  return font;
}

/**
 * hb_ft_font_has_changed:
 * @font: #hb_font_t to work upon
 *
 * Refreshes the state of @font when the underlying FT_Face has changed.
 * This function should be called after changing the size or
 * variation-axis settings on the FT_Face.
 *
 * Since: 1.0.5
 **/
void
hb_ft_font_changed (hb_font_t *font)
{
  if (font->destroy != (hb_destroy_func_t) _hb_ft_font_destroy)
    return;

  hb_ft_font_t *ft_font = (hb_ft_font_t *) font->user_data;
  FT_Face ft_face = ft_font->ft_face;

  hb_font_set_scale (font,
		     (int) (((uint64_t) ft_face->size->metrics.x_scale * (uint64_t) ft_face->units_per_EM + (1u<<15)) >> 16),
		     (int) (((uint64_t) ft_face->size->metrics.y_scale * (uint64_t) ft_face->units_per_EM + (1u<<15)) >> 16));
#if 0 /* hb-ft works in no-hinting model */
  hb_font_set_ppem (font,
		    ft_face->size->metrics.x_ppem,
		    ft_face->size->metrics.y_ppem);
#endif

#if defined(HAVE_FT_GET_VAR_BLEND_COORDINATES) && !defined(HB_NO_VAR)
  FT_MM_Var *mm_var = nullptr;
  if (!FT_Get_MM_Var (ft_face, &mm_var))
  {
    FT_Fixed *ft_coords = (FT_Fixed *) calloc (mm_var->num_axis, sizeof (FT_Fixed));
    int *coords = (int *) calloc (mm_var->num_axis, sizeof (int));
    if (coords && ft_coords)
    {
      if (!FT_Get_Var_Blend_Coordinates (ft_face, mm_var->num_axis, ft_coords))
      {
	bool nonzero = false;

	for (unsigned int i = 0; i < mm_var->num_axis; ++i)
	 {
	  coords[i] = ft_coords[i] >>= 2;
	  nonzero = nonzero || coords[i];
	 }

	if (nonzero)
	  hb_font_set_var_coords_normalized (font, coords, mm_var->num_axis);
	else
	  hb_font_set_var_coords_normalized (font, nullptr, 0);
      }
    }
    free (coords);
    free (ft_coords);
#ifdef HAVE_FT_DONE_MM_VAR
    FT_Done_MM_Var (ft_face->glyph->library, mm_var);
#else
    free (mm_var);
#endif
  }
#endif
}

/**
 * hb_ft_font_create_referenced:
 * @ft_face: FT_Face to work upon
 *
 * Creates an #hb_font_t font object from the specified FT_Face.
 *
 * <note>Note: You must set the face size on @ft_face before calling
 * hb_ft_font_create_references() on it. Otherwise, HarfBuzz will not pick up
 * the face size.</note>
 *
 * This is the preferred variant of the hb_ft_font_create*
 * function family, because it calls FT_Reference_Face() on @ft_face,
 * ensuring that @ft_face remains alive as long as the resulting
 * #hb_font_t font object remains alive.
 *
 * Use this version unless you know you have good reasons not to.
 *
 * Return value: (transfer full): the new #hb_font_t font object
 *
 * Since: 0.9.38
 **/
hb_font_t *
hb_ft_font_create_referenced (FT_Face ft_face)
{
  FT_Reference_Face (ft_face);
  return hb_ft_font_create (ft_face, _hb_ft_face_destroy);
}

#if HB_USE_ATEXIT
static void free_static_ft_library ();
#endif

static struct hb_ft_library_lazy_loader_t : hb_lazy_loader_t<hb_remove_pointer<FT_Library>,
							     hb_ft_library_lazy_loader_t>
{
  static FT_Library create ()
  {
    FT_Library l;
    if (FT_Init_FreeType (&l))
      return nullptr;

#if HB_USE_ATEXIT
    atexit (free_static_ft_library);
#endif

    return l;
  }
  static void destroy (FT_Library l)
  {
    FT_Done_FreeType (l);
  }
  static FT_Library get_null ()
  {
    return nullptr;
  }
} static_ft_library;

#if HB_USE_ATEXIT
static
void free_static_ft_library ()
{
  static_ft_library.free_instance ();
}
#endif

static FT_Library
get_ft_library ()
{
  return static_ft_library.get_unconst ();
}

static void
_release_blob (FT_Face ft_face)
{
  hb_blob_destroy ((hb_blob_t *) ft_face->generic.data);
}

/**
 * hb_ft_font_set_funcs:
 * @font: #hb_font_t to work upon
 *
 * Configures the font-functions structure of the specified
 * #hb_font_t font object to use FreeType font functions.
 *
 * In particular, you can use this function to configure an
 * existing #hb_face_t face object for use with FreeType font
 * functions even if that #hb_face_t face object was initially
 * created with hb_face_create(), and therefore was not
 * initially configured to use FreeType font functions.
 *
 * An #hb_face_t face object created with hb_ft_face_create()
 * is preconfigured for FreeType font functions and does not
 * require this function to be used.
 *
 * <note>Note: Internally, this function creates an FT_Face.
* </note>
 *
 * Since: 1.0.5
 **/
void
hb_ft_font_set_funcs (hb_font_t *font)
{
  hb_blob_t *blob = hb_face_reference_blob (font->face);
  unsigned int blob_length;
  const char *blob_data = hb_blob_get_data (blob, &blob_length);
  if (unlikely (!blob_length))
    DEBUG_MSG (FT, font, "Font face has empty blob");

  FT_Face ft_face = nullptr;
  FT_Error err = FT_New_Memory_Face (get_ft_library (),
				     (const FT_Byte *) blob_data,
				     blob_length,
				     hb_face_get_index (font->face),
				     &ft_face);

  if (unlikely (err)) {
    hb_blob_destroy (blob);
    DEBUG_MSG (FT, font, "Font face FT_New_Memory_Face() failed");
    return;
  }

  if (FT_Select_Charmap (ft_face, FT_ENCODING_MS_SYMBOL))
    FT_Select_Charmap (ft_face, FT_ENCODING_UNICODE);

  FT_Set_Char_Size (ft_face,
		    abs (font->x_scale), abs (font->y_scale),
		    0, 0);
#if 0
		    font->x_ppem * 72 * 64 / font->x_scale,
		    font->y_ppem * 72 * 64 / font->y_scale);
#endif
  if (font->x_scale < 0 || font->y_scale < 0)
  {
    FT_Matrix matrix = { font->x_scale < 0 ? -1 : +1, 0,
			  0, font->y_scale < 0 ? -1 : +1};
    FT_Set_Transform (ft_face, &matrix, nullptr);
  }

#if defined(HAVE_FT_GET_VAR_BLEND_COORDINATES) && !defined(HB_NO_VAR)
  unsigned int num_coords;
  const int *coords = hb_font_get_var_coords_normalized (font, &num_coords);
  if (num_coords)
  {
    FT_Fixed *ft_coords = (FT_Fixed *) calloc (num_coords, sizeof (FT_Fixed));
    if (ft_coords)
    {
      for (unsigned int i = 0; i < num_coords; i++)
	ft_coords[i] = coords[i] * 4;
      FT_Set_Var_Blend_Coordinates (ft_face, num_coords, ft_coords);
      free (ft_coords);
    }
  }
#endif

  ft_face->generic.data = blob;
  ft_face->generic.finalizer = (FT_Generic_Finalizer) _release_blob;

  _hb_ft_font_set_funcs (font, ft_face, true);
  hb_ft_font_set_load_flags (font, FT_LOAD_DEFAULT | FT_LOAD_NO_HINTING);
}

#endif


text:
/*
 * Copyright © 2018  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.
 *
 * Google Author(s): Behdad Esfahbod
 */

#include "hb-ot-shape-complex-khmer.hh"

int
main ()
{
  for (hb_codepoint_t u = 0; u <= 0x10FFFF; u++)
  {
    hb_glyph_info_t info;
    info.codepoint = u;
    set_khmer_properties (info);
    if (info.khmer_category() != INDIC_SYLLABIC_CATEGORY_OTHER)
      printf("U+%04X	%u\n", u,
	     info.khmer_category());
  }
}


text:
/*
 * Copyright © 2018  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.
 *
 * Google Author(s): Behdad Esfahbod
 */

#ifndef HB_OT_SHAPE_COMPLEX_KHMER_HH
#define HB_OT_SHAPE_COMPLEX_KHMER_HH

#include "hb.hh"

#include "hb-ot-shape-complex-indic.hh"

/* buffer var allocations */
#define khmer_category() indic_category() /* khmer_category_t */

/* Note: This enum is duplicated in the -machine.rl source file.
 * Not sure how to avoid duplication. */
enum khmer_category_t
{
  OT_Robatic = 20,
  OT_Xgroup  = 21,
  OT_Ygroup  = 22,
  //OT_VAbv = 26,
  //OT_VBlw = 27,
  //OT_VPre = 28,
  //OT_VPst = 29,
};

static inline void
set_khmer_properties (hb_glyph_info_t &info)
{
  hb_codepoint_t u = info.codepoint;
  unsigned int type = hb_indic_get_categories (u);
  khmer_category_t cat = (khmer_category_t) (type & 0x7Fu);
  indic_position_t pos = (indic_position_t) (type >> 8);

  /*
   * Re-assign category
   *
   * These categories are experimentally extracted from what Uniscribe allows.
   */
  switch (u)
  {
    case 0x179Au:
      cat = (khmer_category_t) OT_Ra;
      break;

    case 0x17CCu:
    case 0x17C9u:
    case 0x17CAu:
      cat = OT_Robatic;
      break;

    case 0x17C6u:
    case 0x17CBu:
    case 0x17CDu:
    case 0x17CEu:
    case 0x17CFu:
    case 0x17D0u:
    case 0x17D1u:
      cat = OT_Xgroup;
      break;

    case 0x17C7u:
    case 0x17C8u:
    case 0x17DDu:
    case 0x17D3u: /* Just guessing. Uniscribe doesn't categorize it. */
      cat = OT_Ygroup;
      break;
  }

  /*
   * Re-assign position.
   */
  if (cat == (khmer_category_t) OT_M)
    switch ((int) pos)
    {
      case POS_PRE_C:	cat = (khmer_category_t) OT_VPre; break;
      case POS_BELOW_C:	cat = (khmer_category_t) OT_VBlw; break;
      case POS_ABOVE_C:	cat = (khmer_category_t) OT_VAbv; break;
      case POS_POST_C:	cat = (khmer_category_t) OT_VPst; break;
      default: assert (0);
    }

  info.khmer_category() = cat;
}

#endif /* HB_OT_SHAPE_COMPLEX_KHMER_HH */


text:
/*
 * Copyright © 2018  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.
 *
 * Google Author(s): Garret Rieger
 */

#ifndef HB_OT_HDMX_TABLE_HH
#define HB_OT_HDMX_TABLE_HH

#include "hb-open-type.hh"

/*
 * hdmx -- Horizontal Device Metrics
 * https://docs.microsoft.com/en-us/typography/opentype/spec/hdmx
 */
#define HB_OT_TAG_hdmx HB_TAG('h','d','m','x')

namespace OT {

struct DeviceRecord
{
  static unsigned int get_size (unsigned count)
  { return hb_ceil_to_4 (min_size + count * HBUINT8::static_size); }

  template<typename Iterator,
	   hb_requires (hb_is_iterator (Iterator))>
  bool serialize (hb_serialize_context_t *c, unsigned pixelSize, Iterator it)
  {
    TRACE_SERIALIZE (this);

    unsigned length = it.len ();

    if (unlikely (!c->extend (*this, length)))  return_trace (false);

    this->pixelSize = pixelSize;
    this->maxWidth =
    + it
    | hb_reduce (hb_max, 0u);

    + it
    | hb_sink (widthsZ.as_array (length));

    return_trace (true);
  }

  bool sanitize (hb_sanitize_context_t *c, unsigned sizeDeviceRecord) const
  {
    TRACE_SANITIZE (this);
    return_trace (likely (c->check_struct (this) &&
			  c->check_range (this, sizeDeviceRecord)));
  }

  HBUINT8			pixelSize;	/* Pixel size for following widths (as ppem). */
  HBUINT8			maxWidth;	/* Maximum width. */
  UnsizedArrayOf<HBUINT8>	widthsZ;	/* Array of widths (numGlyphs is from the 'maxp' table). */
  public:
  DEFINE_SIZE_ARRAY (2, widthsZ);
};

struct hdmx
{
  static constexpr hb_tag_t tableTag = HB_OT_TAG_hdmx;

  unsigned int get_size () const
  { return min_size + numRecords * sizeDeviceRecord; }

  const DeviceRecord& operator [] (unsigned int i) const
  {
    /* XXX Null(DeviceRecord) is NOT safe as it's num-glyphs lengthed.
     * https://github.com/harfbuzz/harfbuzz/issues/1300 */
    if (unlikely (i >= numRecords)) return Null (DeviceRecord);
    return StructAtOffset<DeviceRecord> (&this->firstDeviceRecord, i * sizeDeviceRecord);
  }

  template<typename Iterator,
	   hb_requires (hb_is_iterator (Iterator))>
  bool serialize (hb_serialize_context_t *c, unsigned version, Iterator it)
  {
    TRACE_SERIALIZE (this);

    if (unlikely (!c->extend_min ((*this))))  return_trace (false);

    this->version = version;
    this->numRecords = it.len ();
    this->sizeDeviceRecord = DeviceRecord::get_size (it ? (*it).second.len () : 0);

    for (const hb_item_type<Iterator>& _ : +it)
      c->start_embed<DeviceRecord> ()->serialize (c, _.first, _.second);

    return_trace (c->successful);
  }

  bool subset (hb_subset_context_t *c) const
  {
    TRACE_SUBSET (this);

    hdmx *hdmx_prime = c->serializer->start_embed <hdmx> ();
    if (unlikely (!hdmx_prime)) return_trace (false);

    auto it =
    + hb_range ((unsigned) numRecords)
    | hb_map ([c, this] (unsigned _)
	{
	  const DeviceRecord *device_record =
	    &StructAtOffset<DeviceRecord> (&firstDeviceRecord,
					   _ * sizeDeviceRecord);
	  auto row =
	    + hb_range (c->plan->num_output_glyphs ())
	    | hb_map (c->plan->reverse_glyph_map)
	    | hb_map ([this, c, device_record] (hb_codepoint_t _)
		      {
			if (c->plan->is_empty_glyph (_))
			  return Null (HBUINT8);
			return device_record->widthsZ.as_array (get_num_glyphs ()) [_];
		      })
	    ;
	  return hb_pair ((unsigned) device_record->pixelSize, +row);
	})
    ;

    hdmx_prime->serialize (c->serializer, version, it);
    return_trace (true);
  }

  unsigned get_num_glyphs () const
  {
    return sizeDeviceRecord - DeviceRecord::min_size;
  }

  bool sanitize (hb_sanitize_context_t *c) const
  {
    TRACE_SANITIZE (this);
    return_trace (c->check_struct (this) &&
		  !hb_unsigned_mul_overflows (numRecords, sizeDeviceRecord) &&
		  sizeDeviceRecord >= DeviceRecord::min_size &&
		  c->check_range (this, get_size ()));
  }

  protected:
  HBUINT16	version;	/* Table version number (0) */
  HBUINT16	numRecords;	/* Number of device records. */
  HBUINT32	sizeDeviceRecord;
				/* Size of a device record, 32-bit aligned. */
  DeviceRecord	firstDeviceRecord;
				/* Array of device records. */
  public:
  DEFINE_SIZE_MIN (8);
};

} /* namespace OT */

#endif /* HB_OT_HDMX_TABLE_HH */


text:
/*
 * Copyright © 2017  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.
 *
 * Google Author(s): Behdad Esfahbod
 */

#ifndef HB_OT_VAR_MVAR_TABLE_HH
#define HB_OT_VAR_MVAR_TABLE_HH

#include "hb-ot-layout-common.hh"

namespace OT {

struct VariationValueRecord
{
  bool sanitize (hb_sanitize_context_t *c) const
  {
    TRACE_SANITIZE (this);
    return_trace (c->check_struct (this));
  }

  public:
  Tag		valueTag;	/* Four-byte tag identifying a font-wide measure. */
  HBUINT32		varIdx;		/* Outer/inner index into VariationStore item. */

  public:
  DEFINE_SIZE_STATIC (8);
};

/*
 * MVAR -- Metrics Variations
 * https://docs.microsoft.com/en-us/typography/opentype/spec/mvar
 */
#define HB_OT_TAG_MVAR HB_TAG('M','V','A','R')

struct MVAR
{
  static constexpr hb_tag_t tableTag = HB_OT_TAG_MVAR;

  bool sanitize (hb_sanitize_context_t *c) const
  {
    TRACE_SANITIZE (this);
    return_trace (version.sanitize (c) &&
		  likely (version.major == 1) &&
		  c->check_struct (this) &&
		  valueRecordSize >= VariationValueRecord::static_size &&
		  varStore.sanitize (c, this) &&
		  c->check_range (valuesZ.arrayZ,
				  valueRecordCount,
				  valueRecordSize));
  }

  float get_var (hb_tag_t tag,
		 const int *coords, unsigned int coord_count) const
  {
    const VariationValueRecord *record;
    record = (VariationValueRecord *) hb_bsearch (tag,
						  (const VariationValueRecord *)
						    (const HBUINT8 *) valuesZ,
						  valueRecordCount, valueRecordSize,
						  tag_compare);
    if (!record)
      return 0.;

    return (this+varStore).get_delta (record->varIdx, coords, coord_count);
  }

protected:
  static int tag_compare (const void *pa, const void *pb)
  {
    const hb_tag_t *a = (const hb_tag_t *) pa;
    const Tag *b = (const Tag *) pb;
    return b->cmp (*a);
  }

  protected:
  FixedVersion<>version;	/* Version of the metrics variation table
				 * initially set to 0x00010000u */
  HBUINT16	reserved;	/* Not used; set to 0. */
  HBUINT16	valueRecordSize;/* The size in bytes of each value record —
				 * must be greater than zero. */
  HBUINT16	valueRecordCount;/* The number of value records — may be zero. */
  OffsetTo<VariationStore>
		varStore;	/* Offset to item variation store table. */
  UnsizedArrayOf<HBUINT8>
		valuesZ;	/* Array of value records. The records must be
				 * in binary order of their valueTag field. */

  public:
  DEFINE_SIZE_ARRAY (12, valuesZ);
};

} /* namespace OT */

#endif /* HB_OT_VAR_MVAR_TABLE_HH */


text:
/*
 * Copyright © 2019  Ebrahim Byagowi
 *
 *  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.
 */

#ifndef HB_GDI_H
#define HB_GDI_H

#include "hb.h"

#include <windows.h>

HB_BEGIN_DECLS

HB_EXTERN hb_face_t *
hb_gdi_face_create (HFONT hfont);

HB_END_DECLS

#endif /* HB_GDI_H */


text:
prefix=%prefix%
exec_prefix=%exec_prefix%
libdir=%libdir%
includedir=%includedir%

Name: harfbuzz
Description: HarfBuzz font subsetter
Version: %VERSION%

Requires: harfbuzz
Libs: -L${libdir} -lharfbuzz-subset
Cflags: -I${includedir}/harfbuzz