The Tor Browser: gfx/harfbuzz/src/hb-uniscribe.cc@925c144e1f1f (annotated)

gfx/harfbuzz/src/hb-uniscribe.cc@925c144e1f1f (annotated)

gfx/harfbuzz/src/hb-uniscribe.cc

Fri, 16 Jan 2015 18:13:44 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Fri, 16 Jan 2015 18:13:44 +0100
branch: TOR_BUG_9701
changeset 14: 925c144e1f1f
permissions: -rw-r--r--

Integrate suggestion from review to improve consistency with existing code.

 /*
  * Copyright © 2011,2012,2013  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.
  *
  * Google Author(s): Behdad Esfahbod
  */
 #define _WIN32_WINNT 0x0600
 #define WIN32_LEAN_AND_MEAN
 #define HB_SHAPER uniscribe
 #include "hb-shaper-impl-private.hh"
 #include <windows.h>
 #include <usp10.h>
 #include <rpc.h>
 #include "hb-uniscribe.h"
 #include "hb-open-file-private.hh"
 #include "hb-ot-name-table.hh"
 #include "hb-ot-tag.h"
 #ifndef HB_DEBUG_UNISCRIBE
 #define HB_DEBUG_UNISCRIBE (HB_DEBUG+0)
 #endif
 typedef HRESULT (WINAPI *SIOT) /*ScriptItemizeOpenType*/(
   const WCHAR *pwcInChars,
   int cInChars,
   int cMaxItems,
   const SCRIPT_CONTROL *psControl,
   const SCRIPT_STATE *psState,
   SCRIPT_ITEM *pItems,
   OPENTYPE_TAG *pScriptTags,
   int *pcItems
 );
 typedef HRESULT (WINAPI *SSOT) /*ScriptShapeOpenType*/(
   HDC hdc,
   SCRIPT_CACHE *psc,
   SCRIPT_ANALYSIS *psa,
   OPENTYPE_TAG tagScript,
   OPENTYPE_TAG tagLangSys,
   int *rcRangeChars,
   TEXTRANGE_PROPERTIES **rpRangeProperties,
   int cRanges,
   const WCHAR *pwcChars,
   int cChars,
   int cMaxGlyphs,
   WORD *pwLogClust,
   SCRIPT_CHARPROP *pCharProps,
   WORD *pwOutGlyphs,
   SCRIPT_GLYPHPROP *pOutGlyphProps,
   int *pcGlyphs
 );
 typedef HRESULT (WINAPI *SPOT) /*ScriptPlaceOpenType*/(
   HDC hdc,
   SCRIPT_CACHE *psc,
   SCRIPT_ANALYSIS *psa,
   OPENTYPE_TAG tagScript,
   OPENTYPE_TAG tagLangSys,
   int *rcRangeChars,
   TEXTRANGE_PROPERTIES **rpRangeProperties,
   int cRanges,
   const WCHAR *pwcChars,
   WORD *pwLogClust,
   SCRIPT_CHARPROP *pCharProps,
   int cChars,
   const WORD *pwGlyphs,
   const SCRIPT_GLYPHPROP *pGlyphProps,
   int cGlyphs,
   int *piAdvance,
   GOFFSET *pGoffset,
   ABC *pABC
 );
 /* Fallback implementations. */
 static HRESULT WINAPI
 hb_ScriptItemizeOpenType(
   const WCHAR *pwcInChars,
   int cInChars,
   int cMaxItems,
   const SCRIPT_CONTROL *psControl,
   const SCRIPT_STATE *psState,
   SCRIPT_ITEM *pItems,
   OPENTYPE_TAG *pScriptTags,
   int *pcItems
 )
 {
 {
   return ScriptItemize (pwcInChars,
 			cInChars,
 			cMaxItems,
 			psControl,
 			psState,
 			pItems,
 			pcItems);
 }
 }
 static HRESULT WINAPI
 hb_ScriptShapeOpenType(
   HDC hdc,
   SCRIPT_CACHE *psc,
   SCRIPT_ANALYSIS *psa,
   OPENTYPE_TAG tagScript,
   OPENTYPE_TAG tagLangSys,
   int *rcRangeChars,
   TEXTRANGE_PROPERTIES **rpRangeProperties,
   int cRanges,
   const WCHAR *pwcChars,
   int cChars,
   int cMaxGlyphs,
   WORD *pwLogClust,
   SCRIPT_CHARPROP *pCharProps,
   WORD *pwOutGlyphs,
   SCRIPT_GLYPHPROP *pOutGlyphProps,
   int *pcGlyphs
 )
 {
   SCRIPT_VISATTR *psva = (SCRIPT_VISATTR *) pOutGlyphProps;
   return ScriptShape (hdc,
 		      psc,
 		      pwcChars,
 		      cChars,
 		      cMaxGlyphs,
 		      psa,
 		      pwOutGlyphs,
 		      pwLogClust,
 		      psva,
 		      pcGlyphs);
 }
 static HRESULT WINAPI
 hb_ScriptPlaceOpenType(
   HDC hdc,
   SCRIPT_CACHE *psc,
   SCRIPT_ANALYSIS *psa,
   OPENTYPE_TAG tagScript,
   OPENTYPE_TAG tagLangSys,
   int *rcRangeChars,
   TEXTRANGE_PROPERTIES **rpRangeProperties,
   int cRanges,
   const WCHAR *pwcChars,
   WORD *pwLogClust,
   SCRIPT_CHARPROP *pCharProps,
   int cChars,
   const WORD *pwGlyphs,
   const SCRIPT_GLYPHPROP *pGlyphProps,
   int cGlyphs,
   int *piAdvance,
   GOFFSET *pGoffset,
   ABC *pABC
 )
 {
   SCRIPT_VISATTR *psva = (SCRIPT_VISATTR *) pGlyphProps;
   return ScriptPlace (hdc,
 		      psc,
 		      pwGlyphs,
 		      cGlyphs,
 		      psva,
 		      psa,
 		      piAdvance,
 		      pGoffset,
 		      pABC);
 }
 struct hb_uniscribe_shaper_funcs_t {
   SIOT ScriptItemizeOpenType;
   SSOT ScriptShapeOpenType;
   SPOT ScriptPlaceOpenType;
   inline void init (void)
   {
     HMODULE hinstLib;
     this->ScriptItemizeOpenType = NULL;
     this->ScriptShapeOpenType   = NULL;
     this->ScriptPlaceOpenType   = NULL;
     hinstLib = GetModuleHandle (TEXT ("usp10.dll"));
     if (hinstLib)
     {
       this->ScriptItemizeOpenType = (SIOT) GetProcAddress (hinstLib, "ScriptItemizeOpenType");
       this->ScriptShapeOpenType   = (SSOT) GetProcAddress (hinstLib, "ScriptShapeOpenType");
       this->ScriptPlaceOpenType   = (SPOT) GetProcAddress (hinstLib, "ScriptPlaceOpenType");
     }
     if (!this->ScriptItemizeOpenType ||
 	!this->ScriptShapeOpenType   ||
 	!this->ScriptPlaceOpenType)
     {
       DEBUG_MSG (UNISCRIBE, NULL, "OpenType versions of functions not found; falling back.");
       this->ScriptItemizeOpenType = hb_ScriptItemizeOpenType;
       this->ScriptShapeOpenType   = hb_ScriptShapeOpenType;
       this->ScriptPlaceOpenType   = hb_ScriptPlaceOpenType;
     }
   }
 };
 static hb_uniscribe_shaper_funcs_t *uniscribe_funcs;
 static inline void
 free_uniscribe_funcs (void)
 {
   free (uniscribe_funcs);
 }
 static hb_uniscribe_shaper_funcs_t *
 hb_uniscribe_shaper_get_funcs (void)
 {
 retry:
   hb_uniscribe_shaper_funcs_t *funcs = (hb_uniscribe_shaper_funcs_t *) hb_atomic_ptr_get (&uniscribe_funcs);
   if (unlikely (!funcs))
   {
     funcs = (hb_uniscribe_shaper_funcs_t *) calloc (1, sizeof (hb_uniscribe_shaper_funcs_t));
     if (unlikely (!funcs))
       return NULL;
     funcs->init ();
     if (!hb_atomic_ptr_cmpexch (&uniscribe_funcs, NULL, funcs)) {
       free (funcs);
       goto retry;
     }
 #ifdef HAVE_ATEXIT
     atexit (free_uniscribe_funcs); /* First person registers atexit() callback. */
 #endif
   }
   return funcs;
 }
 struct active_feature_t {
   OPENTYPE_FEATURE_RECORD rec;
   unsigned int order;
   static int cmp (const active_feature_t *a, const active_feature_t *b) {
     return a->rec.tagFeature < b->rec.tagFeature ? -1 : a->rec.tagFeature > b->rec.tagFeature ? 1 :
 	   a->order < b->order ? -1 : a->order > b->order ? 1 :
 	   a->rec.lParameter < b->rec.lParameter ? -1 : a->rec.lParameter > b->rec.lParameter ? 1 :
 ;
   }
   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;
   static int cmp (const feature_event_t *a, const feature_event_t *b) {
     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 {
   TEXTRANGE_PROPERTIES props;
   unsigned int index_first; /* == start */
   unsigned int index_last;  /* == end - 1 */
 };
 HB_SHAPER_DATA_ENSURE_DECLARE(uniscribe, face)
 HB_SHAPER_DATA_ENSURE_DECLARE(uniscribe, font)
 /*
  * shaper face data
  */
 struct hb_uniscribe_shaper_face_data_t {
   HANDLE fh;
   hb_uniscribe_shaper_funcs_t *funcs;
   wchar_t face_name[LF_FACESIZE];
 };
 /* face_name should point to a wchar_t[LF_FACESIZE] object. */
 static void
 _hb_generate_unique_face_name (wchar_t *face_name, unsigned int *plen)
 {
   /* We'll create a private name for the font from a UUID using a simple,
    * somewhat base64-like encoding scheme */
   const char *enc = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+-";
   UUID id;
   UuidCreate ((UUID*) &id);
   unsigned int name_str_len = 0;
   face_name[name_str_len++] = 'F';
   face_name[name_str_len++] = '_';
   unsigned char *p = (unsigned char *) &id;
   for (unsigned int i = 0; i < 16; i += 2)
   {
     /* Spread the 16 bits from two bytes of the UUID across three chars of face_name,
      * using the bits in groups of 5,5,6 to select chars from enc.
      * This will generate 24 characters; with the 'F_' prefix we already provided,
      * the name will be 26 chars (plus the NUL terminator), so will always fit within
      * face_name (LF_FACESIZE = 32). */
     face_name[name_str_len++] = enc[p[i] >> 3];
     face_name[name_str_len++] = enc[((p[i] << 2) | (p[i + 1] >> 6)) & 0x1f];
     face_name[name_str_len++] = enc[p[i + 1] & 0x3f];
   }
   face_name[name_str_len] = 0;
   if (plen)
     *plen = name_str_len;
 }
 /* Destroys blob. */
 static hb_blob_t *
 _hb_rename_font (hb_blob_t *blob, wchar_t *new_name)
 {
   /* Create a copy of the font data, with the 'name' table replaced by a
    * table that names the font with our private F_* name created above.
    * For simplicity, we just append a new 'name' table and update the
    * sfnt directory; the original table is left in place, but unused.
    *
    * The new table will contain just 5 name IDs: family, style, unique,
    * full, PS. All of them point to the same name data with our unique name.
    */
   blob = OT::Sanitizer<OT::OpenTypeFontFile>::sanitize (blob);
   unsigned int length, new_length, name_str_len;
   const char *orig_sfnt_data = hb_blob_get_data (blob, &length);
   _hb_generate_unique_face_name (new_name, &name_str_len);
   static const uint16_t name_IDs[] = { 1, 2, 3, 4, 6 };
   unsigned int name_table_length = OT::name::min_size +
                                    ARRAY_LENGTH (name_IDs) * OT::NameRecord::static_size +
                                    name_str_len * 2; /* for name data in UTF16BE form */
   unsigned int name_table_offset = (length + 3) & ~3;
   new_length = name_table_offset + ((name_table_length + 3) & ~3);
   void *new_sfnt_data = calloc (1, new_length);
   if (!new_sfnt_data)
   {
     hb_blob_destroy (blob);
     return NULL;
   }
   memcpy(new_sfnt_data, orig_sfnt_data, length);
   OT::name &name = OT::StructAtOffset<OT::name> (new_sfnt_data, name_table_offset);
   name.format.set (0);
   name.count.set (ARRAY_LENGTH (name_IDs));
   name.stringOffset.set (name.get_size ());
   for (unsigned int i = 0; i < ARRAY_LENGTH (name_IDs); i++)
   {
     OT::NameRecord &record = name.nameRecord[i];
     record.platformID.set (3);
     record.encodingID.set (1);
     record.languageID.set (0x0409); /* English */
     record.nameID.set (name_IDs[i]);
     record.length.set (name_str_len * 2);
     record.offset.set (0);
   }
   /* Copy string data from new_name, converting wchar_t to UTF16BE. */
   unsigned char *p = &OT::StructAfter<unsigned char> (name);
   for (unsigned int i = 0; i < name_str_len; i++)
   {
     *p++ = new_name[i] >> 8;
     *p++ = new_name[i] & 0xff;
   }
   /* Adjust name table entry to point to new name table */
   const OT::OpenTypeFontFile &file = * (OT::OpenTypeFontFile *) (new_sfnt_data);
   unsigned int face_count = file.get_face_count ();
   for (unsigned int face_index = 0; face_index < face_count; face_index++)
   {
     /* Note: doing multiple edits (ie. TTC) can be unsafe.  There may be
      * toe-stepping.  But we don't really care. */
     const OT::OpenTypeFontFace &face = file.get_face (face_index);
     unsigned int index;
     if (face.find_table_index (HB_OT_TAG_name, &index))
     {
       OT::TableRecord &record = const_cast<OT::TableRecord &> (face.get_table (index));
       record.checkSum.set_for_data (&name, name_table_length);
       record.offset.set (name_table_offset);
       record.length.set (name_table_length);
     }
     else if (face_index == 0) /* Fail if first face doesn't have 'name' table. */
     {
       free (new_sfnt_data);
       hb_blob_destroy (blob);
       return NULL;
     }
   }
   /* The checkSumAdjustment field in the 'head' table is now wrong,
    * but that doesn't actually seem to cause any problems so we don't
    * bother. */
   hb_blob_destroy (blob);
   return hb_blob_create ((const char *) new_sfnt_data, new_length,
 			 HB_MEMORY_MODE_WRITABLE, NULL, free);
 }
 hb_uniscribe_shaper_face_data_t *
 _hb_uniscribe_shaper_face_data_create (hb_face_t *face)
 {
   hb_uniscribe_shaper_face_data_t *data = (hb_uniscribe_shaper_face_data_t *) calloc (1, sizeof (hb_uniscribe_shaper_face_data_t));
   if (unlikely (!data))
     return NULL;
   data->funcs = hb_uniscribe_shaper_get_funcs ();
   if (unlikely (!data->funcs))
   {
     free (data);
     return NULL;
   }
   hb_blob_t *blob = hb_face_reference_blob (face);
   if (unlikely (!hb_blob_get_length (blob)))
     DEBUG_MSG (UNISCRIBE, face, "Face has empty blob");
   blob = _hb_rename_font (blob, data->face_name);
   if (unlikely (!blob))
   {
     free (data);
     return NULL;
   }
   DWORD num_fonts_installed;
   data->fh = AddFontMemResourceEx ((void *) hb_blob_get_data (blob, NULL),
 				   hb_blob_get_length (blob),
 , &num_fonts_installed);
   if (unlikely (!data->fh))
   {
     DEBUG_MSG (UNISCRIBE, face, "Face AddFontMemResourceEx() failed");
     free (data);
     return NULL;
   }
   return data;
 }
 void
 _hb_uniscribe_shaper_face_data_destroy (hb_uniscribe_shaper_face_data_t *data)
 {
   RemoveFontMemResourceEx (data->fh);
   free (data);
 }
 /*
  * shaper font data
  */
 struct hb_uniscribe_shaper_font_data_t {
   HDC hdc;
   LOGFONTW log_font;
   HFONT hfont;
   SCRIPT_CACHE script_cache;
 };
 static bool
 populate_log_font (LOGFONTW  *lf,
 		   hb_font_t *font)
 {
   memset (lf, 0, sizeof (*lf));
   lf->lfHeight = -font->y_scale;
   lf->lfCharSet = DEFAULT_CHARSET;
   hb_face_t *face = font->face;
   hb_uniscribe_shaper_face_data_t *face_data = HB_SHAPER_DATA_GET (face);
   memcpy (lf->lfFaceName, face_data->face_name, sizeof (lf->lfFaceName));
   return true;
 }
 hb_uniscribe_shaper_font_data_t *
 _hb_uniscribe_shaper_font_data_create (hb_font_t *font)
 {
   if (unlikely (!hb_uniscribe_shaper_face_data_ensure (font->face))) return NULL;
   hb_uniscribe_shaper_font_data_t *data = (hb_uniscribe_shaper_font_data_t *) calloc (1, sizeof (hb_uniscribe_shaper_font_data_t));
   if (unlikely (!data))
     return NULL;
   data->hdc = GetDC (NULL);
   if (unlikely (!populate_log_font (&data->log_font, font))) {
     DEBUG_MSG (UNISCRIBE, font, "Font populate_log_font() failed");
     _hb_uniscribe_shaper_font_data_destroy (data);
     return NULL;
   }
   data->hfont = CreateFontIndirectW (&data->log_font);
   if (unlikely (!data->hfont)) {
     DEBUG_MSG (UNISCRIBE, font, "Font CreateFontIndirectW() failed");
     _hb_uniscribe_shaper_font_data_destroy (data);
      return NULL;
   }
   if (!SelectObject (data->hdc, data->hfont)) {
     DEBUG_MSG (UNISCRIBE, font, "Font SelectObject() failed");
     _hb_uniscribe_shaper_font_data_destroy (data);
      return NULL;
   }
   return data;
 }
 void
 _hb_uniscribe_shaper_font_data_destroy (hb_uniscribe_shaper_font_data_t *data)
 {
   if (data->hdc)
     ReleaseDC (NULL, data->hdc);
   if (data->hfont)
     DeleteObject (data->hfont);
   if (data->script_cache)
     ScriptFreeCache (&data->script_cache);
   free (data);
 }
 LOGFONTW *
 hb_uniscribe_font_get_logfontw (hb_font_t *font)
 {
   if (unlikely (!hb_uniscribe_shaper_font_data_ensure (font))) return NULL;
   hb_uniscribe_shaper_font_data_t *font_data =  HB_SHAPER_DATA_GET (font);
   return &font_data->log_font;
 }
 HFONT
 hb_uniscribe_font_get_hfont (hb_font_t *font)
 {
   if (unlikely (!hb_uniscribe_shaper_font_data_ensure (font))) return NULL;
   hb_uniscribe_shaper_font_data_t *font_data =  HB_SHAPER_DATA_GET (font);
   return font_data->hfont;
 }
 /*
  * shaper shape_plan data
  */
 struct hb_uniscribe_shaper_shape_plan_data_t {};
 hb_uniscribe_shaper_shape_plan_data_t *
 _hb_uniscribe_shaper_shape_plan_data_create (hb_shape_plan_t    *shape_plan HB_UNUSED,
 					     const hb_feature_t *user_features HB_UNUSED,
 					     unsigned int        num_user_features HB_UNUSED)
 {
   return (hb_uniscribe_shaper_shape_plan_data_t *) HB_SHAPER_DATA_SUCCEEDED;
 }
 void
 _hb_uniscribe_shaper_shape_plan_data_destroy (hb_uniscribe_shaper_shape_plan_data_t *data HB_UNUSED)
 {
 }
 /*
  * shaper
  */
 hb_bool_t
 _hb_uniscribe_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;
   hb_uniscribe_shaper_face_data_t *face_data = HB_SHAPER_DATA_GET (face);
   hb_uniscribe_shaper_font_data_t *font_data = HB_SHAPER_DATA_GET (font);
   hb_uniscribe_shaper_funcs_t *funcs = face_data->funcs;
   /*
    * Set up features.
    */
   hb_auto_array_t<OPENTYPE_FEATURE_RECORD> feature_records;
   hb_auto_array_t<range_record_t> range_records;
   if (num_features)
   {
     /* Sort features by start/end events. */
     hb_auto_array_t<feature_event_t> feature_events;
     for (unsigned int i = 0; i < num_features; i++)
     {
       active_feature_t feature;
       feature.rec.tagFeature = hb_uint32_swap (features[i].tag);
       feature.rec.lParameter = features[i].value;
       feature.order = i;
       feature_event_t *event;
       event = feature_events.push ();
       if (unlikely (!event))
 	goto fail_features;
       event->index = features[i].start;
       event->start = true;
       event->feature = feature;
       event = feature_events.push ();
       if (unlikely (!event))
 	goto fail_features;
       event->index = features[i].end;
       event->start = false;
       event->feature = feature;
     }
     feature_events.sort ();
     /* Add a strategic final event. */
     {
       active_feature_t feature;
       feature.rec.tagFeature = 0;
       feature.rec.lParameter = 0;
       feature.order = num_features + 1;
       feature_event_t *event = feature_events.push ();
       if (unlikely (!event))
 	goto fail_features;
       event->index = 0; /* This value does magic. */
       event->start = false;
       event->feature = feature;
     }
     /* Scan events and save features for each range. */
     hb_auto_array_t<active_feature_t> active_features;
     unsigned int last_index = 0;
     for (unsigned int i = 0; i < feature_events.len; 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 (unlikely (!range))
 	  goto fail_features;
 	unsigned int offset = feature_records.len;
 	active_features.sort ();
 	for (unsigned int j = 0; j < active_features.len; j++)
 	{
 	  if (!j || active_features[j].rec.tagFeature != feature_records[feature_records.len - 1].tagFeature)
 	  {
 	    OPENTYPE_FEATURE_RECORD *feature = feature_records.push ();
 	    if (unlikely (!feature))
 	      goto fail_features;
 	    *feature = active_features[j].rec;
 	  }
 	  else
 	  {
 	    /* Overrides value for existing feature. */
 	    feature_records[feature_records.len - 1].lParameter = active_features[j].rec.lParameter;
 	  }
 	}
 	/* Will convert to pointer after all is ready, since feature_records.array
 	 * may move as we grow it. */
 	range->props.potfRecords = reinterpret_cast<OPENTYPE_FEATURE_RECORD *> (offset);
 	range->props.cotfRecords = feature_records.len - offset;
 	range->index_first = last_index;
 	range->index_last  = event->index - 1;
 	last_index = event->index;
       }
       if (event->start) {
         active_feature_t *feature = active_features.push ();
 	if (unlikely (!feature))
 	  goto fail_features;
 	*feature = event->feature;
       } else {
         active_feature_t *feature = active_features.find (&event->feature);
 	if (feature)
 	  active_features.remove (feature - active_features.array);
       }
     }
     if (!range_records.len) /* No active feature found. */
       goto fail_features;
     /* Fixup the pointers. */
     for (unsigned int i = 0; i < range_records.len; i++)
     {
       range_record_t *range = &range_records[i];
       range->props.potfRecords = feature_records.array + reinterpret_cast<uintptr_t> (range->props.potfRecords);
     }
   }
   else
   {
   fail_features:
     num_features = 0;
   }
 #define FAIL(...) \
   HB_STMT_START { \
     DEBUG_MSG (UNISCRIBE, NULL, __VA_ARGS__); \
     return false; \
   } HB_STMT_END;
   HRESULT hr;
 retry:
   unsigned int scratch_size;
   hb_buffer_t::scratch_buffer_t *scratch = buffer->get_scratch_buffer (&scratch_size);
 #define ALLOCATE_ARRAY(Type, name, len) \
   Type *name = (Type *) scratch; \
   { \
     unsigned int _consumed = DIV_CEIL ((len) * sizeof (Type), sizeof (*scratch)); \
     assert (_consumed <= scratch_size); \
     scratch += _consumed; \
     scratch_size -= _consumed; \
   }
 #define utf16_index() var1.u32
   ALLOCATE_ARRAY (WCHAR, pchars, buffer->len * 2);
   unsigned int chars_len = 0;
   for (unsigned int i = 0; i < buffer->len; i++)
   {
     hb_codepoint_t c = buffer->info[i].codepoint;
     buffer->info[i].utf16_index() = chars_len;
     if (likely (c < 0x10000))
       pchars[chars_len++] = c;
     else if (unlikely (c >= 0x110000))
       pchars[chars_len++] = 0xFFFD;
     else {
       pchars[chars_len++] = 0xD800 + ((c - 0x10000) >> 10);
       pchars[chars_len++] = 0xDC00 + ((c - 0x10000) & ((1 << 10) - 1));
     }
   }
   ALLOCATE_ARRAY (WORD, log_clusters, chars_len);
   ALLOCATE_ARRAY (SCRIPT_CHARPROP, char_props, chars_len);
   if (num_features)
   {
     /* Need log_clusters to assign features. */
     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 (c >= 0x10000 && c < 0x110000)
 	log_clusters[chars_len++] = cluster; /* Surrogates. */
     }
   }
   /* The -2 in the following is to compensate for possible
    * alignment needed after the WORD array.  sizeof(WORD) == 2. */
   unsigned int glyphs_size = (scratch_size * sizeof (int) - 2)
 			   / (sizeof (WORD) +
 			      sizeof (SCRIPT_GLYPHPROP) +
 			      sizeof (int) +
 			      sizeof (GOFFSET) +
 			      sizeof (uint32_t));
   ALLOCATE_ARRAY (WORD, glyphs, glyphs_size);
   ALLOCATE_ARRAY (SCRIPT_GLYPHPROP, glyph_props, glyphs_size);
   ALLOCATE_ARRAY (int, advances, glyphs_size);
   ALLOCATE_ARRAY (GOFFSET, offsets, glyphs_size);
   ALLOCATE_ARRAY (uint32_t, vis_clusters, glyphs_size);
   /* Note:
    * We can't touch the contents of glyph_props.  Our fallback
    * implementations of Shape and Place functions use that buffer
    * by casting it to a different type.  It works because they
    * both agree about it, but if we want to access it here we
    * need address that issue first.
    */
 #undef ALLOCATE_ARRAY
 #define MAX_ITEMS 256
   SCRIPT_ITEM items[MAX_ITEMS + 1];
   SCRIPT_CONTROL bidi_control = {0};
   SCRIPT_STATE bidi_state = {0};
   ULONG script_tags[MAX_ITEMS];
   int item_count;
   /* MinGW32 doesn't define fMergeNeutralItems, so we bruteforce */
   //bidi_control.fMergeNeutralItems = true;
   *(uint32_t*)&bidi_control |= 1<<24;
   bidi_state.uBidiLevel = HB_DIRECTION_IS_FORWARD (buffer->props.direction) ? 0 : 1;
   bidi_state.fOverrideDirection = 1;
   hr = funcs->ScriptItemizeOpenType (pchars,
 				     chars_len,
 				     MAX_ITEMS,
 				     &bidi_control,
 				     &bidi_state,
 				     items,
 				     script_tags,
 				     &item_count);
   if (unlikely (FAILED (hr)))
     FAIL ("ScriptItemizeOpenType() failed: 0x%08xL", hr);
 #undef MAX_ITEMS
   OPENTYPE_TAG language_tag = hb_uint32_swap (hb_ot_tag_from_language (buffer->props.language));
   hb_auto_array_t<TEXTRANGE_PROPERTIES*> range_properties;
   hb_auto_array_t<int> range_char_counts;
   unsigned int glyphs_offset = 0;
   unsigned int glyphs_len;
   bool backward = HB_DIRECTION_IS_BACKWARD (buffer->props.direction);
   for (unsigned int i = 0; i < item_count; i++)
   {
     unsigned int chars_offset = items[i].iCharPos;
     unsigned int item_chars_len = items[i + 1].iCharPos - chars_offset;
     if (num_features)
     {
       range_properties.shrink (0);
       range_char_counts.shrink (0);
       range_record_t *last_range = &range_records[0];
       for (unsigned int k = chars_offset; k < chars_offset + item_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_properties.len ||
 	    &range->props != range_properties[range_properties.len - 1])
 	{
 	  TEXTRANGE_PROPERTIES **props = range_properties.push ();
 	  int *c = range_char_counts.push ();
 	  if (unlikely (!props || !c))
 	  {
 	    range_properties.shrink (0);
 	    range_char_counts.shrink (0);
 	    break;
 	  }
 	  *props = &range->props;
 	  *c = 1;
 	}
 	else
 	{
 	  range_char_counts[range_char_counts.len - 1]++;
 	}
 	last_range = range;
       }
     }
     /* Asking for glyphs in logical order circumvents at least
      * one bug in Uniscribe. */
     items[i].a.fLogicalOrder = true;
   retry_shape:
     hr = funcs->ScriptShapeOpenType (font_data->hdc,
 				     &font_data->script_cache,
 				     &items[i].a,
 				     script_tags[i],
 				     language_tag,
 				     range_char_counts.array,
 				     range_properties.array,
 				     range_properties.len,
 				     pchars + chars_offset,
 				     item_chars_len,
 				     glyphs_size - glyphs_offset,
 				     /* out */
 				     log_clusters + chars_offset,
 				     char_props + chars_offset,
 				     glyphs + glyphs_offset,
 				     glyph_props + glyphs_offset,
 				     (int *) &glyphs_len);
     if (unlikely (items[i].a.fNoGlyphIndex))
       FAIL ("ScriptShapeOpenType() set fNoGlyphIndex");
     if (unlikely (hr == E_OUTOFMEMORY))
     {
       buffer->ensure (buffer->allocated * 2);
       if (buffer->in_error)
 	FAIL ("Buffer resize failed");
       goto retry;
     }
     if (unlikely (hr == USP_E_SCRIPT_NOT_IN_FONT))
     {
       if (items[i].a.eScript == SCRIPT_UNDEFINED)
 	FAIL ("ScriptShapeOpenType() failed: Font doesn't support script");
       items[i].a.eScript = SCRIPT_UNDEFINED;
       goto retry_shape;
     }
     if (unlikely (FAILED (hr)))
     {
       FAIL ("ScriptShapeOpenType() failed: 0x%08xL", hr);
     }
     for (unsigned int j = chars_offset; j < chars_offset + item_chars_len; j++)
       log_clusters[j] += glyphs_offset;
     hr = funcs->ScriptPlaceOpenType (font_data->hdc,
 				     &font_data->script_cache,
 				     &items[i].a,
 				     script_tags[i],
 				     language_tag,
 				     range_char_counts.array,
 				     range_properties.array,
 				     range_properties.len,
 				     pchars + chars_offset,
 				     log_clusters + chars_offset,
 				     char_props + chars_offset,
 				     item_chars_len,
 				     glyphs + glyphs_offset,
 				     glyph_props + glyphs_offset,
 				     glyphs_len,
 				     /* out */
 				     advances + glyphs_offset,
 				     offsets + glyphs_offset,
 				     NULL);
     if (unlikely (FAILED (hr)))
       FAIL ("ScriptPlaceOpenType() failed: 0x%08xL", hr);
     if (DEBUG_ENABLED (UNISCRIBE))
       fprintf (stderr, "Item %d RTL %d LayoutRTL %d LogicalOrder %d ScriptTag %c%c%c%c\n",
 	       i,
 	       items[i].a.fRTL,
 	       items[i].a.fLayoutRTL,
 	       items[i].a.fLogicalOrder,
 	       HB_UNTAG (hb_uint32_swap (script_tags[i])));
     glyphs_offset += glyphs_len;
   }
   glyphs_len = glyphs_offset;
   /* Ok, we've got everything we need, now compose output buffer,
    * very, *very*, carefully! */
   /* Calculate visual-clusters.  That's what we ship. */
   for (unsigned int i = 0; i < glyphs_len; i++)
     vis_clusters[i] = -1;
   for (unsigned int i = 0; i < buffer->len; i++) {
     uint32_t *p = &vis_clusters[log_clusters[buffer->info[i].utf16_index()]];
     *p = MIN (*p, buffer->info[i].cluster);
   }
   for (unsigned int i = 1; i < glyphs_len; i++)
     if (vis_clusters[i] == -1)
       vis_clusters[i] = vis_clusters[i - 1];
 #undef utf16_index
   buffer->ensure (glyphs_len);
   if (buffer->in_error)
     FAIL ("Buffer in error");
 #undef FAIL
   /* Set glyph infos */
   buffer->len = 0;
   for (unsigned int i = 0; i < glyphs_len; i++)
   {
     hb_glyph_info_t *info = &buffer->info[buffer->len++];
     info->codepoint = glyphs[i];
     info->cluster = vis_clusters[i];
     /* The rest is crap.  Let's store position info there for now. */
     info->mask = advances[i];
     info->var1.u32 = offsets[i].du;
     info->var2.u32 = offsets[i].dv;
   }
   /* Set glyph positions */
   buffer->clear_positions ();
   for (unsigned int i = 0; i < glyphs_len; i++)
   {
     hb_glyph_info_t *info = &buffer->info[i];
     hb_glyph_position_t *pos = &buffer->pos[i];
     /* TODO vertical */
     pos->x_advance = info->mask;
     pos->x_offset = backward ? -info->var1.u32 : info->var1.u32;
     pos->y_offset = info->var2.u32;
   }
   if (backward)
     hb_buffer_reverse (buffer);
   /* Wow, done! */
   return true;
 }

The Tor Browser / annotate

gfx/harfbuzz/src/hb-uniscribe.cc@925c144e1f1f (annotated)

gfx/harfbuzz/src/hb-uniscribe.cc