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      1 /*
      2  * Copyright  2011,2012,2013  Google, Inc.
      3  *
      4  *  This is part of HarfBuzz, a text shaping library.
      5  *
      6  * Permission is hereby granted, without written agreement and without
      7  * license or royalty fees, to use, copy, modify, and distribute this
      8  * software and its documentation for any purpose, provided that the
      9  * above copyright notice and the following two paragraphs appear in
     10  * all copies of this software.
     11  *
     12  * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
     13  * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
     14  * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
     15  * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
     16  * DAMAGE.
     17  *
     18  * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
     19  * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
     20  * FITNESS FOR A PARTICULAR PURPOSE.  THE SOFTWARE PROVIDED HEREUNDER IS
     21  * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
     22  * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
     23  *
     24  * Google Author(s): Behdad Esfahbod
     25  */
     26 
     27 #define HB_SHAPER uniscribe
     28 #include "hb-shaper-impl-private.hh"
     29 
     30 #include <windows.h>
     31 #include <usp10.h>
     32 #include <rpc.h>
     33 
     34 #include "hb-uniscribe.h"
     35 
     36 #include "hb-open-file-private.hh"
     37 #include "hb-ot-name-table.hh"
     38 #include "hb-ot-tag.h"
     39 
     40 
     41 #ifndef HB_DEBUG_UNISCRIBE
     42 #define HB_DEBUG_UNISCRIBE (HB_DEBUG+0)
     43 #endif
     44 
     45 
     46 static inline uint16_t hb_uint16_swap (const uint16_t v)
     47 { return (v >> 8) | (v << 8); }
     48 static inline uint32_t hb_uint32_swap (const uint32_t v)
     49 { return (hb_uint16_swap (v) << 16) | hb_uint16_swap (v >> 16); }
     50 
     51 
     52 typedef HRESULT (WINAPI *SIOT) /*ScriptItemizeOpenType*/(
     53   const WCHAR *pwcInChars,
     54   int cInChars,
     55   int cMaxItems,
     56   const SCRIPT_CONTROL *psControl,
     57   const SCRIPT_STATE *psState,
     58   SCRIPT_ITEM *pItems,
     59   OPENTYPE_TAG *pScriptTags,
     60   int *pcItems
     61 );
     62 
     63 typedef HRESULT (WINAPI *SSOT) /*ScriptShapeOpenType*/(
     64   HDC hdc,
     65   SCRIPT_CACHE *psc,
     66   SCRIPT_ANALYSIS *psa,
     67   OPENTYPE_TAG tagScript,
     68   OPENTYPE_TAG tagLangSys,
     69   int *rcRangeChars,
     70   TEXTRANGE_PROPERTIES **rpRangeProperties,
     71   int cRanges,
     72   const WCHAR *pwcChars,
     73   int cChars,
     74   int cMaxGlyphs,
     75   WORD *pwLogClust,
     76   SCRIPT_CHARPROP *pCharProps,
     77   WORD *pwOutGlyphs,
     78   SCRIPT_GLYPHPROP *pOutGlyphProps,
     79   int *pcGlyphs
     80 );
     81 
     82 typedef HRESULT (WINAPI *SPOT) /*ScriptPlaceOpenType*/(
     83   HDC hdc,
     84   SCRIPT_CACHE *psc,
     85   SCRIPT_ANALYSIS *psa,
     86   OPENTYPE_TAG tagScript,
     87   OPENTYPE_TAG tagLangSys,
     88   int *rcRangeChars,
     89   TEXTRANGE_PROPERTIES **rpRangeProperties,
     90   int cRanges,
     91   const WCHAR *pwcChars,
     92   WORD *pwLogClust,
     93   SCRIPT_CHARPROP *pCharProps,
     94   int cChars,
     95   const WORD *pwGlyphs,
     96   const SCRIPT_GLYPHPROP *pGlyphProps,
     97   int cGlyphs,
     98   int *piAdvance,
     99   GOFFSET *pGoffset,
    100   ABC *pABC
    101 );
    102 
    103 
    104 /* Fallback implementations. */
    105 
    106 static HRESULT WINAPI
    107 hb_ScriptItemizeOpenType(
    108   const WCHAR *pwcInChars,
    109   int cInChars,
    110   int cMaxItems,
    111   const SCRIPT_CONTROL *psControl,
    112   const SCRIPT_STATE *psState,
    113   SCRIPT_ITEM *pItems,
    114   OPENTYPE_TAG *pScriptTags,
    115   int *pcItems
    116 )
    117 {
    118 {
    119   return ScriptItemize (pwcInChars,
    120 			cInChars,
    121 			cMaxItems,
    122 			psControl,
    123 			psState,
    124 			pItems,
    125 			pcItems);
    126 }
    127 }
    128 
    129 static HRESULT WINAPI
    130 hb_ScriptShapeOpenType(
    131   HDC hdc,
    132   SCRIPT_CACHE *psc,
    133   SCRIPT_ANALYSIS *psa,
    134   OPENTYPE_TAG tagScript,
    135   OPENTYPE_TAG tagLangSys,
    136   int *rcRangeChars,
    137   TEXTRANGE_PROPERTIES **rpRangeProperties,
    138   int cRanges,
    139   const WCHAR *pwcChars,
    140   int cChars,
    141   int cMaxGlyphs,
    142   WORD *pwLogClust,
    143   SCRIPT_CHARPROP *pCharProps,
    144   WORD *pwOutGlyphs,
    145   SCRIPT_GLYPHPROP *pOutGlyphProps,
    146   int *pcGlyphs
    147 )
    148 {
    149   SCRIPT_VISATTR *psva = (SCRIPT_VISATTR *) pOutGlyphProps;
    150   return ScriptShape (hdc,
    151 		      psc,
    152 		      pwcChars,
    153 		      cChars,
    154 		      cMaxGlyphs,
    155 		      psa,
    156 		      pwOutGlyphs,
    157 		      pwLogClust,
    158 		      psva,
    159 		      pcGlyphs);
    160 }
    161 
    162 static HRESULT WINAPI
    163 hb_ScriptPlaceOpenType(
    164   HDC hdc,
    165   SCRIPT_CACHE *psc,
    166   SCRIPT_ANALYSIS *psa,
    167   OPENTYPE_TAG tagScript,
    168   OPENTYPE_TAG tagLangSys,
    169   int *rcRangeChars,
    170   TEXTRANGE_PROPERTIES **rpRangeProperties,
    171   int cRanges,
    172   const WCHAR *pwcChars,
    173   WORD *pwLogClust,
    174   SCRIPT_CHARPROP *pCharProps,
    175   int cChars,
    176   const WORD *pwGlyphs,
    177   const SCRIPT_GLYPHPROP *pGlyphProps,
    178   int cGlyphs,
    179   int *piAdvance,
    180   GOFFSET *pGoffset,
    181   ABC *pABC
    182 )
    183 {
    184   SCRIPT_VISATTR *psva = (SCRIPT_VISATTR *) pGlyphProps;
    185   return ScriptPlace (hdc,
    186 		      psc,
    187 		      pwGlyphs,
    188 		      cGlyphs,
    189 		      psva,
    190 		      psa,
    191 		      piAdvance,
    192 		      pGoffset,
    193 		      pABC);
    194 }
    195 
    196 
    197 struct hb_uniscribe_shaper_funcs_t {
    198   SIOT ScriptItemizeOpenType;
    199   SSOT ScriptShapeOpenType;
    200   SPOT ScriptPlaceOpenType;
    201 
    202   inline void init (void)
    203   {
    204     HMODULE hinstLib;
    205     this->ScriptItemizeOpenType = NULL;
    206     this->ScriptShapeOpenType   = NULL;
    207     this->ScriptPlaceOpenType   = NULL;
    208 
    209     hinstLib = GetModuleHandle (TEXT ("usp10.dll"));
    210     if (hinstLib)
    211     {
    212       this->ScriptItemizeOpenType = (SIOT) GetProcAddress (hinstLib, "ScriptItemizeOpenType");
    213       this->ScriptShapeOpenType   = (SSOT) GetProcAddress (hinstLib, "ScriptShapeOpenType");
    214       this->ScriptPlaceOpenType   = (SPOT) GetProcAddress (hinstLib, "ScriptPlaceOpenType");
    215     }
    216     if (!this->ScriptItemizeOpenType ||
    217 	!this->ScriptShapeOpenType   ||
    218 	!this->ScriptPlaceOpenType)
    219     {
    220       DEBUG_MSG (UNISCRIBE, NULL, "OpenType versions of functions not found; falling back.");
    221       this->ScriptItemizeOpenType = hb_ScriptItemizeOpenType;
    222       this->ScriptShapeOpenType   = hb_ScriptShapeOpenType;
    223       this->ScriptPlaceOpenType   = hb_ScriptPlaceOpenType;
    224     }
    225   }
    226 };
    227 static hb_uniscribe_shaper_funcs_t *uniscribe_funcs;
    228 
    229 static inline void
    230 free_uniscribe_funcs (void)
    231 {
    232   free (uniscribe_funcs);
    233 }
    234 
    235 static hb_uniscribe_shaper_funcs_t *
    236 hb_uniscribe_shaper_get_funcs (void)
    237 {
    238 retry:
    239   hb_uniscribe_shaper_funcs_t *funcs = (hb_uniscribe_shaper_funcs_t *) hb_atomic_ptr_get (&uniscribe_funcs);
    240 
    241   if (unlikely (!funcs))
    242   {
    243     funcs = (hb_uniscribe_shaper_funcs_t *) calloc (1, sizeof (hb_uniscribe_shaper_funcs_t));
    244     if (unlikely (!funcs))
    245       return NULL;
    246 
    247     funcs->init ();
    248 
    249     if (!hb_atomic_ptr_cmpexch (&uniscribe_funcs, NULL, funcs)) {
    250       free (funcs);
    251       goto retry;
    252     }
    253 
    254 #ifdef HB_USE_ATEXIT
    255     atexit (free_uniscribe_funcs); /* First person registers atexit() callback. */
    256 #endif
    257   }
    258 
    259   return funcs;
    260 }
    261 
    262 
    263 struct active_feature_t {
    264   OPENTYPE_FEATURE_RECORD rec;
    265   unsigned int order;
    266 
    267   static int cmp (const active_feature_t *a, const active_feature_t *b) {
    268     return a->rec.tagFeature < b->rec.tagFeature ? -1 : a->rec.tagFeature > b->rec.tagFeature ? 1 :
    269 	   a->order < b->order ? -1 : a->order > b->order ? 1 :
    270 	   a->rec.lParameter < b->rec.lParameter ? -1 : a->rec.lParameter > b->rec.lParameter ? 1 :
    271 	   0;
    272   }
    273   bool operator== (const active_feature_t *f) {
    274     return cmp (this, f) == 0;
    275   }
    276 };
    277 
    278 struct feature_event_t {
    279   unsigned int index;
    280   bool start;
    281   active_feature_t feature;
    282 
    283   static int cmp (const feature_event_t *a, const feature_event_t *b) {
    284     return a->index < b->index ? -1 : a->index > b->index ? 1 :
    285 	   a->start < b->start ? -1 : a->start > b->start ? 1 :
    286 	   active_feature_t::cmp (&a->feature, &b->feature);
    287   }
    288 };
    289 
    290 struct range_record_t {
    291   TEXTRANGE_PROPERTIES props;
    292   unsigned int index_first; /* == start */
    293   unsigned int index_last;  /* == end - 1 */
    294 };
    295 
    296 HB_SHAPER_DATA_ENSURE_DECLARE(uniscribe, face)
    297 HB_SHAPER_DATA_ENSURE_DECLARE(uniscribe, font)
    298 
    299 
    300 /*
    301  * shaper face data
    302  */
    303 
    304 struct hb_uniscribe_shaper_face_data_t {
    305   HANDLE fh;
    306   hb_uniscribe_shaper_funcs_t *funcs;
    307   wchar_t face_name[LF_FACESIZE];
    308 };
    309 
    310 /* face_name should point to a wchar_t[LF_FACESIZE] object. */
    311 static void
    312 _hb_generate_unique_face_name (wchar_t *face_name, unsigned int *plen)
    313 {
    314   /* We'll create a private name for the font from a UUID using a simple,
    315    * somewhat base64-like encoding scheme */
    316   const char *enc = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+-";
    317   UUID id;
    318   UuidCreate ((UUID*) &id);
    319   ASSERT_STATIC (2 + 3 * (16/2) < LF_FACESIZE);
    320   unsigned int name_str_len = 0;
    321   face_name[name_str_len++] = 'F';
    322   face_name[name_str_len++] = '_';
    323   unsigned char *p = (unsigned char *) &id;
    324   for (unsigned int i = 0; i < 16; i += 2)
    325   {
    326     /* Spread the 16 bits from two bytes of the UUID across three chars of face_name,
    327      * using the bits in groups of 5,5,6 to select chars from enc.
    328      * This will generate 24 characters; with the 'F_' prefix we already provided,
    329      * the name will be 26 chars (plus the NUL terminator), so will always fit within
    330      * face_name (LF_FACESIZE = 32). */
    331     face_name[name_str_len++] = enc[p[i] >> 3];
    332     face_name[name_str_len++] = enc[((p[i] << 2) | (p[i + 1] >> 6)) & 0x1f];
    333     face_name[name_str_len++] = enc[p[i + 1] & 0x3f];
    334   }
    335   face_name[name_str_len] = 0;
    336   if (plen)
    337     *plen = name_str_len;
    338 }
    339 
    340 /* Destroys blob. */
    341 static hb_blob_t *
    342 _hb_rename_font (hb_blob_t *blob, wchar_t *new_name)
    343 {
    344   /* Create a copy of the font data, with the 'name' table replaced by a
    345    * table that names the font with our private F_* name created above.
    346    * For simplicity, we just append a new 'name' table and update the
    347    * sfnt directory; the original table is left in place, but unused.
    348    *
    349    * The new table will contain just 5 name IDs: family, style, unique,
    350    * full, PS. All of them point to the same name data with our unique name.
    351    */
    352 
    353   blob = OT::Sanitizer<OT::OpenTypeFontFile>::sanitize (blob);
    354 
    355   unsigned int length, new_length, name_str_len;
    356   const char *orig_sfnt_data = hb_blob_get_data (blob, &length);
    357 
    358   _hb_generate_unique_face_name (new_name, &name_str_len);
    359 
    360   static const uint16_t name_IDs[] = { 1, 2, 3, 4, 6 };
    361 
    362   unsigned int name_table_length = OT::name::min_size +
    363                                    ARRAY_LENGTH (name_IDs) * OT::NameRecord::static_size +
    364                                    name_str_len * 2; /* for name data in UTF16BE form */
    365   unsigned int name_table_offset = (length + 3) & ~3;
    366 
    367   new_length = name_table_offset + ((name_table_length + 3) & ~3);
    368   void *new_sfnt_data = calloc (1, new_length);
    369   if (!new_sfnt_data)
    370   {
    371     hb_blob_destroy (blob);
    372     return NULL;
    373   }
    374 
    375   memcpy(new_sfnt_data, orig_sfnt_data, length);
    376 
    377   OT::name &name = OT::StructAtOffset<OT::name> (new_sfnt_data, name_table_offset);
    378   name.format.set (0);
    379   name.count.set (ARRAY_LENGTH (name_IDs));
    380   name.stringOffset.set (name.get_size ());
    381   for (unsigned int i = 0; i < ARRAY_LENGTH (name_IDs); i++)
    382   {
    383     OT::NameRecord &record = name.nameRecord[i];
    384     record.platformID.set (3);
    385     record.encodingID.set (1);
    386     record.languageID.set (0x0409u); /* English */
    387     record.nameID.set (name_IDs[i]);
    388     record.length.set (name_str_len * 2);
    389     record.offset.set (0);
    390   }
    391 
    392   /* Copy string data from new_name, converting wchar_t to UTF16BE. */
    393   unsigned char *p = &OT::StructAfter<unsigned char> (name);
    394   for (unsigned int i = 0; i < name_str_len; i++)
    395   {
    396     *p++ = new_name[i] >> 8;
    397     *p++ = new_name[i] & 0xff;
    398   }
    399 
    400   /* Adjust name table entry to point to new name table */
    401   const OT::OpenTypeFontFile &file = * (OT::OpenTypeFontFile *) (new_sfnt_data);
    402   unsigned int face_count = file.get_face_count ();
    403   for (unsigned int face_index = 0; face_index < face_count; face_index++)
    404   {
    405     /* Note: doing multiple edits (ie. TTC) can be unsafe.  There may be
    406      * toe-stepping.  But we don't really care. */
    407     const OT::OpenTypeFontFace &face = file.get_face (face_index);
    408     unsigned int index;
    409     if (face.find_table_index (HB_OT_TAG_name, &index))
    410     {
    411       OT::TableRecord &record = const_cast<OT::TableRecord &> (face.get_table (index));
    412       record.checkSum.set_for_data (&name, name_table_length);
    413       record.offset.set (name_table_offset);
    414       record.length.set (name_table_length);
    415     }
    416     else if (face_index == 0) /* Fail if first face doesn't have 'name' table. */
    417     {
    418       free (new_sfnt_data);
    419       hb_blob_destroy (blob);
    420       return NULL;
    421     }
    422   }
    423 
    424   /* The checkSumAdjustment field in the 'head' table is now wrong,
    425    * but that doesn't actually seem to cause any problems so we don't
    426    * bother. */
    427 
    428   hb_blob_destroy (blob);
    429   return hb_blob_create ((const char *) new_sfnt_data, new_length,
    430 			 HB_MEMORY_MODE_WRITABLE, NULL, free);
    431 }
    432 
    433 hb_uniscribe_shaper_face_data_t *
    434 _hb_uniscribe_shaper_face_data_create (hb_face_t *face)
    435 {
    436   hb_uniscribe_shaper_face_data_t *data = (hb_uniscribe_shaper_face_data_t *) calloc (1, sizeof (hb_uniscribe_shaper_face_data_t));
    437   if (unlikely (!data))
    438     return NULL;
    439 
    440   data->funcs = hb_uniscribe_shaper_get_funcs ();
    441   if (unlikely (!data->funcs))
    442   {
    443     free (data);
    444     return NULL;
    445   }
    446 
    447   hb_blob_t *blob = hb_face_reference_blob (face);
    448   if (unlikely (!hb_blob_get_length (blob)))
    449     DEBUG_MSG (UNISCRIBE, face, "Face has empty blob");
    450 
    451   blob = _hb_rename_font (blob, data->face_name);
    452   if (unlikely (!blob))
    453   {
    454     free (data);
    455     return NULL;
    456   }
    457 
    458   DWORD num_fonts_installed;
    459   data->fh = AddFontMemResourceEx ((void *) hb_blob_get_data (blob, NULL),
    460 				   hb_blob_get_length (blob),
    461 				   0, &num_fonts_installed);
    462   if (unlikely (!data->fh))
    463   {
    464     DEBUG_MSG (UNISCRIBE, face, "Face AddFontMemResourceEx() failed");
    465     free (data);
    466     return NULL;
    467   }
    468 
    469   return data;
    470 }
    471 
    472 void
    473 _hb_uniscribe_shaper_face_data_destroy (hb_uniscribe_shaper_face_data_t *data)
    474 {
    475   RemoveFontMemResourceEx (data->fh);
    476   free (data);
    477 }
    478 
    479 
    480 /*
    481  * shaper font data
    482  */
    483 
    484 struct hb_uniscribe_shaper_font_data_t {
    485   HDC hdc;
    486   LOGFONTW log_font;
    487   HFONT hfont;
    488   SCRIPT_CACHE script_cache;
    489   double x_mult, y_mult; /* From LOGFONT space to HB space. */
    490 };
    491 
    492 static bool
    493 populate_log_font (LOGFONTW  *lf,
    494 		   hb_font_t *font,
    495 		   unsigned int font_size)
    496 {
    497   memset (lf, 0, sizeof (*lf));
    498   lf->lfHeight = -font_size;
    499   lf->lfCharSet = DEFAULT_CHARSET;
    500 
    501   hb_face_t *face = font->face;
    502   hb_uniscribe_shaper_face_data_t *face_data = HB_SHAPER_DATA_GET (face);
    503 
    504   memcpy (lf->lfFaceName, face_data->face_name, sizeof (lf->lfFaceName));
    505 
    506   return true;
    507 }
    508 
    509 hb_uniscribe_shaper_font_data_t *
    510 _hb_uniscribe_shaper_font_data_create (hb_font_t *font)
    511 {
    512   if (unlikely (!hb_uniscribe_shaper_face_data_ensure (font->face))) return NULL;
    513 
    514   hb_uniscribe_shaper_font_data_t *data = (hb_uniscribe_shaper_font_data_t *) calloc (1, sizeof (hb_uniscribe_shaper_font_data_t));
    515   if (unlikely (!data))
    516     return NULL;
    517 
    518   int font_size = font->face->get_upem (); /* Default... */
    519   /* No idea if the following is even a good idea. */
    520   if (font->y_ppem)
    521     font_size = font->y_ppem;
    522 
    523   if (font_size < 0)
    524     font_size = -font_size;
    525   data->x_mult = (double) font->x_scale / font_size;
    526   data->y_mult = (double) font->y_scale / font_size;
    527 
    528   data->hdc = GetDC (NULL);
    529 
    530   if (unlikely (!populate_log_font (&data->log_font, font, font_size))) {
    531     DEBUG_MSG (UNISCRIBE, font, "Font populate_log_font() failed");
    532     _hb_uniscribe_shaper_font_data_destroy (data);
    533     return NULL;
    534   }
    535 
    536   data->hfont = CreateFontIndirectW (&data->log_font);
    537   if (unlikely (!data->hfont)) {
    538     DEBUG_MSG (UNISCRIBE, font, "Font CreateFontIndirectW() failed");
    539     _hb_uniscribe_shaper_font_data_destroy (data);
    540      return NULL;
    541   }
    542 
    543   if (!SelectObject (data->hdc, data->hfont)) {
    544     DEBUG_MSG (UNISCRIBE, font, "Font SelectObject() failed");
    545     _hb_uniscribe_shaper_font_data_destroy (data);
    546      return NULL;
    547   }
    548 
    549   return data;
    550 }
    551 
    552 void
    553 _hb_uniscribe_shaper_font_data_destroy (hb_uniscribe_shaper_font_data_t *data)
    554 {
    555   if (data->hdc)
    556     ReleaseDC (NULL, data->hdc);
    557   if (data->hfont)
    558     DeleteObject (data->hfont);
    559   if (data->script_cache)
    560     ScriptFreeCache (&data->script_cache);
    561   free (data);
    562 }
    563 
    564 LOGFONTW *
    565 hb_uniscribe_font_get_logfontw (hb_font_t *font)
    566 {
    567   if (unlikely (!hb_uniscribe_shaper_font_data_ensure (font))) return NULL;
    568   hb_uniscribe_shaper_font_data_t *font_data =  HB_SHAPER_DATA_GET (font);
    569   return &font_data->log_font;
    570 }
    571 
    572 HFONT
    573 hb_uniscribe_font_get_hfont (hb_font_t *font)
    574 {
    575   if (unlikely (!hb_uniscribe_shaper_font_data_ensure (font))) return NULL;
    576   hb_uniscribe_shaper_font_data_t *font_data =  HB_SHAPER_DATA_GET (font);
    577   return font_data->hfont;
    578 }
    579 
    580 
    581 /*
    582  * shaper shape_plan data
    583  */
    584 
    585 struct hb_uniscribe_shaper_shape_plan_data_t {};
    586 
    587 hb_uniscribe_shaper_shape_plan_data_t *
    588 _hb_uniscribe_shaper_shape_plan_data_create (hb_shape_plan_t    *shape_plan HB_UNUSED,
    589 					     const hb_feature_t *user_features HB_UNUSED,
    590 					     unsigned int        num_user_features HB_UNUSED)
    591 {
    592   return (hb_uniscribe_shaper_shape_plan_data_t *) HB_SHAPER_DATA_SUCCEEDED;
    593 }
    594 
    595 void
    596 _hb_uniscribe_shaper_shape_plan_data_destroy (hb_uniscribe_shaper_shape_plan_data_t *data HB_UNUSED)
    597 {
    598 }
    599 
    600 
    601 /*
    602  * shaper
    603  */
    604 
    605 
    606 hb_bool_t
    607 _hb_uniscribe_shape (hb_shape_plan_t    *shape_plan,
    608 		     hb_font_t          *font,
    609 		     hb_buffer_t        *buffer,
    610 		     const hb_feature_t *features,
    611 		     unsigned int        num_features)
    612 {
    613   hb_face_t *face = font->face;
    614   hb_uniscribe_shaper_face_data_t *face_data = HB_SHAPER_DATA_GET (face);
    615   hb_uniscribe_shaper_font_data_t *font_data = HB_SHAPER_DATA_GET (font);
    616   hb_uniscribe_shaper_funcs_t *funcs = face_data->funcs;
    617 
    618   /*
    619    * Set up features.
    620    */
    621   hb_auto_array_t<OPENTYPE_FEATURE_RECORD> feature_records;
    622   hb_auto_array_t<range_record_t> range_records;
    623   if (num_features)
    624   {
    625     /* Sort features by start/end events. */
    626     hb_auto_array_t<feature_event_t> feature_events;
    627     for (unsigned int i = 0; i < num_features; i++)
    628     {
    629       active_feature_t feature;
    630       feature.rec.tagFeature = hb_uint32_swap (features[i].tag);
    631       feature.rec.lParameter = features[i].value;
    632       feature.order = i;
    633 
    634       feature_event_t *event;
    635 
    636       event = feature_events.push ();
    637       if (unlikely (!event))
    638 	goto fail_features;
    639       event->index = features[i].start;
    640       event->start = true;
    641       event->feature = feature;
    642 
    643       event = feature_events.push ();
    644       if (unlikely (!event))
    645 	goto fail_features;
    646       event->index = features[i].end;
    647       event->start = false;
    648       event->feature = feature;
    649     }
    650     feature_events.qsort ();
    651     /* Add a strategic final event. */
    652     {
    653       active_feature_t feature;
    654       feature.rec.tagFeature = 0;
    655       feature.rec.lParameter = 0;
    656       feature.order = num_features + 1;
    657 
    658       feature_event_t *event = feature_events.push ();
    659       if (unlikely (!event))
    660 	goto fail_features;
    661       event->index = 0; /* This value does magic. */
    662       event->start = false;
    663       event->feature = feature;
    664     }
    665 
    666     /* Scan events and save features for each range. */
    667     hb_auto_array_t<active_feature_t> active_features;
    668     unsigned int last_index = 0;
    669     for (unsigned int i = 0; i < feature_events.len; i++)
    670     {
    671       feature_event_t *event = &feature_events[i];
    672 
    673       if (event->index != last_index)
    674       {
    675         /* Save a snapshot of active features and the range. */
    676 	range_record_t *range = range_records.push ();
    677 	if (unlikely (!range))
    678 	  goto fail_features;
    679 
    680 	unsigned int offset = feature_records.len;
    681 
    682 	active_features.qsort ();
    683 	for (unsigned int j = 0; j < active_features.len; j++)
    684 	{
    685 	  if (!j || active_features[j].rec.tagFeature != feature_records[feature_records.len - 1].tagFeature)
    686 	  {
    687 	    OPENTYPE_FEATURE_RECORD *feature = feature_records.push ();
    688 	    if (unlikely (!feature))
    689 	      goto fail_features;
    690 	    *feature = active_features[j].rec;
    691 	  }
    692 	  else
    693 	  {
    694 	    /* Overrides value for existing feature. */
    695 	    feature_records[feature_records.len - 1].lParameter = active_features[j].rec.lParameter;
    696 	  }
    697 	}
    698 
    699 	/* Will convert to pointer after all is ready, since feature_records.array
    700 	 * may move as we grow it. */
    701 	range->props.potfRecords = reinterpret_cast<OPENTYPE_FEATURE_RECORD *> (offset);
    702 	range->props.cotfRecords = feature_records.len - offset;
    703 	range->index_first = last_index;
    704 	range->index_last  = event->index - 1;
    705 
    706 	last_index = event->index;
    707       }
    708 
    709       if (event->start) {
    710         active_feature_t *feature = active_features.push ();
    711 	if (unlikely (!feature))
    712 	  goto fail_features;
    713 	*feature = event->feature;
    714       } else {
    715         active_feature_t *feature = active_features.find (&event->feature);
    716 	if (feature)
    717 	  active_features.remove (feature - active_features.array);
    718       }
    719     }
    720 
    721     if (!range_records.len) /* No active feature found. */
    722       goto fail_features;
    723 
    724     /* Fixup the pointers. */
    725     for (unsigned int i = 0; i < range_records.len; i++)
    726     {
    727       range_record_t *range = &range_records[i];
    728       range->props.potfRecords = feature_records.array + reinterpret_cast<uintptr_t> (range->props.potfRecords);
    729     }
    730   }
    731   else
    732   {
    733   fail_features:
    734     num_features = 0;
    735   }
    736 
    737 #define FAIL(...) \
    738   HB_STMT_START { \
    739     DEBUG_MSG (UNISCRIBE, NULL, __VA_ARGS__); \
    740     return false; \
    741   } HB_STMT_END;
    742 
    743   HRESULT hr;
    744 
    745 retry:
    746 
    747   unsigned int scratch_size;
    748   hb_buffer_t::scratch_buffer_t *scratch = buffer->get_scratch_buffer (&scratch_size);
    749 
    750 #define ALLOCATE_ARRAY(Type, name, len) \
    751   Type *name = (Type *) scratch; \
    752   { \
    753     unsigned int _consumed = DIV_CEIL ((len) * sizeof (Type), sizeof (*scratch)); \
    754     assert (_consumed <= scratch_size); \
    755     scratch += _consumed; \
    756     scratch_size -= _consumed; \
    757   }
    758 
    759 #define utf16_index() var1.u32
    760 
    761   ALLOCATE_ARRAY (WCHAR, pchars, buffer->len * 2);
    762 
    763   unsigned int chars_len = 0;
    764   for (unsigned int i = 0; i < buffer->len; i++)
    765   {
    766     hb_codepoint_t c = buffer->info[i].codepoint;
    767     buffer->info[i].utf16_index() = chars_len;
    768     if (likely (c <= 0xFFFFu))
    769       pchars[chars_len++] = c;
    770     else if (unlikely (c > 0x10FFFFu))
    771       pchars[chars_len++] = 0xFFFDu;
    772     else {
    773       pchars[chars_len++] = 0xD800u + ((c - 0x10000u) >> 10);
    774       pchars[chars_len++] = 0xDC00u + ((c - 0x10000u) & ((1 << 10) - 1));
    775     }
    776   }
    777 
    778   ALLOCATE_ARRAY (WORD, log_clusters, chars_len);
    779   ALLOCATE_ARRAY (SCRIPT_CHARPROP, char_props, chars_len);
    780 
    781   if (num_features)
    782   {
    783     /* Need log_clusters to assign features. */
    784     chars_len = 0;
    785     for (unsigned int i = 0; i < buffer->len; i++)
    786     {
    787       hb_codepoint_t c = buffer->info[i].codepoint;
    788       unsigned int cluster = buffer->info[i].cluster;
    789       log_clusters[chars_len++] = cluster;
    790       if (hb_in_range (c, 0x10000u, 0x10FFFFu))
    791 	log_clusters[chars_len++] = cluster; /* Surrogates. */
    792     }
    793   }
    794 
    795   /* The -2 in the following is to compensate for possible
    796    * alignment needed after the WORD array.  sizeof(WORD) == 2. */
    797   unsigned int glyphs_size = (scratch_size * sizeof (int) - 2)
    798 			   / (sizeof (WORD) +
    799 			      sizeof (SCRIPT_GLYPHPROP) +
    800 			      sizeof (int) +
    801 			      sizeof (GOFFSET) +
    802 			      sizeof (uint32_t));
    803 
    804   ALLOCATE_ARRAY (WORD, glyphs, glyphs_size);
    805   ALLOCATE_ARRAY (SCRIPT_GLYPHPROP, glyph_props, glyphs_size);
    806   ALLOCATE_ARRAY (int, advances, glyphs_size);
    807   ALLOCATE_ARRAY (GOFFSET, offsets, glyphs_size);
    808   ALLOCATE_ARRAY (uint32_t, vis_clusters, glyphs_size);
    809 
    810   /* Note:
    811    * We can't touch the contents of glyph_props.  Our fallback
    812    * implementations of Shape and Place functions use that buffer
    813    * by casting it to a different type.  It works because they
    814    * both agree about it, but if we want to access it here we
    815    * need address that issue first.
    816    */
    817 
    818 #undef ALLOCATE_ARRAY
    819 
    820 #define MAX_ITEMS 256
    821 
    822   SCRIPT_ITEM items[MAX_ITEMS + 1];
    823   SCRIPT_CONTROL bidi_control = {0};
    824   SCRIPT_STATE bidi_state = {0};
    825   ULONG script_tags[MAX_ITEMS];
    826   int item_count;
    827 
    828   /* MinGW32 doesn't define fMergeNeutralItems, so we bruteforce */
    829   //bidi_control.fMergeNeutralItems = true;
    830   *(uint32_t*)&bidi_control |= 1<<24;
    831 
    832   bidi_state.uBidiLevel = HB_DIRECTION_IS_FORWARD (buffer->props.direction) ? 0 : 1;
    833   bidi_state.fOverrideDirection = 1;
    834 
    835   hr = funcs->ScriptItemizeOpenType (pchars,
    836 				     chars_len,
    837 				     MAX_ITEMS,
    838 				     &bidi_control,
    839 				     &bidi_state,
    840 				     items,
    841 				     script_tags,
    842 				     &item_count);
    843   if (unlikely (FAILED (hr)))
    844     FAIL ("ScriptItemizeOpenType() failed: 0x%08xL", hr);
    845 
    846 #undef MAX_ITEMS
    847 
    848   OPENTYPE_TAG language_tag = hb_uint32_swap (hb_ot_tag_from_language (buffer->props.language));
    849   hb_auto_array_t<TEXTRANGE_PROPERTIES*> range_properties;
    850   hb_auto_array_t<int> range_char_counts;
    851 
    852   unsigned int glyphs_offset = 0;
    853   unsigned int glyphs_len;
    854   bool backward = HB_DIRECTION_IS_BACKWARD (buffer->props.direction);
    855   for (unsigned int i = 0; i < item_count; i++)
    856   {
    857     unsigned int chars_offset = items[i].iCharPos;
    858     unsigned int item_chars_len = items[i + 1].iCharPos - chars_offset;
    859 
    860     if (num_features)
    861     {
    862       range_properties.shrink (0);
    863       range_char_counts.shrink (0);
    864 
    865       range_record_t *last_range = &range_records[0];
    866 
    867       for (unsigned int k = chars_offset; k < chars_offset + item_chars_len; k++)
    868       {
    869 	range_record_t *range = last_range;
    870 	while (log_clusters[k] < range->index_first)
    871 	  range--;
    872 	while (log_clusters[k] > range->index_last)
    873 	  range++;
    874 	if (!range_properties.len ||
    875 	    &range->props != range_properties[range_properties.len - 1])
    876 	{
    877 	  TEXTRANGE_PROPERTIES **props = range_properties.push ();
    878 	  int *c = range_char_counts.push ();
    879 	  if (unlikely (!props || !c))
    880 	  {
    881 	    range_properties.shrink (0);
    882 	    range_char_counts.shrink (0);
    883 	    break;
    884 	  }
    885 	  *props = &range->props;
    886 	  *c = 1;
    887 	}
    888 	else
    889 	{
    890 	  range_char_counts[range_char_counts.len - 1]++;
    891 	}
    892 
    893 	last_range = range;
    894       }
    895     }
    896 
    897     /* Asking for glyphs in logical order circumvents at least
    898      * one bug in Uniscribe. */
    899     items[i].a.fLogicalOrder = true;
    900 
    901   retry_shape:
    902     hr = funcs->ScriptShapeOpenType (font_data->hdc,
    903 				     &font_data->script_cache,
    904 				     &items[i].a,
    905 				     script_tags[i],
    906 				     language_tag,
    907 				     range_char_counts.array,
    908 				     range_properties.array,
    909 				     range_properties.len,
    910 				     pchars + chars_offset,
    911 				     item_chars_len,
    912 				     glyphs_size - glyphs_offset,
    913 				     /* out */
    914 				     log_clusters + chars_offset,
    915 				     char_props + chars_offset,
    916 				     glyphs + glyphs_offset,
    917 				     glyph_props + glyphs_offset,
    918 				     (int *) &glyphs_len);
    919 
    920     if (unlikely (items[i].a.fNoGlyphIndex))
    921       FAIL ("ScriptShapeOpenType() set fNoGlyphIndex");
    922     if (unlikely (hr == E_OUTOFMEMORY || hr == E_NOT_SUFFICIENT_BUFFER))
    923     {
    924       if (unlikely (!buffer->ensure (buffer->allocated * 2)))
    925 	FAIL ("Buffer resize failed");
    926       goto retry;
    927     }
    928     if (unlikely (hr == USP_E_SCRIPT_NOT_IN_FONT))
    929     {
    930       if (items[i].a.eScript == SCRIPT_UNDEFINED)
    931 	FAIL ("ScriptShapeOpenType() failed: Font doesn't support script");
    932       items[i].a.eScript = SCRIPT_UNDEFINED;
    933       goto retry_shape;
    934     }
    935     if (unlikely (FAILED (hr)))
    936     {
    937       FAIL ("ScriptShapeOpenType() failed: 0x%08xL", hr);
    938     }
    939 
    940     for (unsigned int j = chars_offset; j < chars_offset + item_chars_len; j++)
    941       log_clusters[j] += glyphs_offset;
    942 
    943     hr = funcs->ScriptPlaceOpenType (font_data->hdc,
    944 				     &font_data->script_cache,
    945 				     &items[i].a,
    946 				     script_tags[i],
    947 				     language_tag,
    948 				     range_char_counts.array,
    949 				     range_properties.array,
    950 				     range_properties.len,
    951 				     pchars + chars_offset,
    952 				     log_clusters + chars_offset,
    953 				     char_props + chars_offset,
    954 				     item_chars_len,
    955 				     glyphs + glyphs_offset,
    956 				     glyph_props + glyphs_offset,
    957 				     glyphs_len,
    958 				     /* out */
    959 				     advances + glyphs_offset,
    960 				     offsets + glyphs_offset,
    961 				     NULL);
    962     if (unlikely (FAILED (hr)))
    963       FAIL ("ScriptPlaceOpenType() failed: 0x%08xL", hr);
    964 
    965     if (DEBUG_ENABLED (UNISCRIBE))
    966       fprintf (stderr, "Item %d RTL %d LayoutRTL %d LogicalOrder %d ScriptTag %c%c%c%c\n",
    967 	       i,
    968 	       items[i].a.fRTL,
    969 	       items[i].a.fLayoutRTL,
    970 	       items[i].a.fLogicalOrder,
    971 	       HB_UNTAG (hb_uint32_swap (script_tags[i])));
    972 
    973     glyphs_offset += glyphs_len;
    974   }
    975   glyphs_len = glyphs_offset;
    976 
    977   /* Ok, we've got everything we need, now compose output buffer,
    978    * very, *very*, carefully! */
    979 
    980   /* Calculate visual-clusters.  That's what we ship. */
    981   for (unsigned int i = 0; i < glyphs_len; i++)
    982     vis_clusters[i] = -1;
    983   for (unsigned int i = 0; i < buffer->len; i++) {
    984     uint32_t *p = &vis_clusters[log_clusters[buffer->info[i].utf16_index()]];
    985     *p = MIN (*p, buffer->info[i].cluster);
    986   }
    987   for (unsigned int i = 1; i < glyphs_len; i++)
    988     if (vis_clusters[i] == -1)
    989       vis_clusters[i] = vis_clusters[i - 1];
    990 
    991 #undef utf16_index
    992 
    993   if (unlikely (!buffer->ensure (glyphs_len)))
    994     FAIL ("Buffer in error");
    995 
    996 #undef FAIL
    997 
    998   /* Set glyph infos */
    999   buffer->len = 0;
   1000   for (unsigned int i = 0; i < glyphs_len; i++)
   1001   {
   1002     hb_glyph_info_t *info = &buffer->info[buffer->len++];
   1003 
   1004     info->codepoint = glyphs[i];
   1005     info->cluster = vis_clusters[i];
   1006 
   1007     /* The rest is crap.  Let's store position info there for now. */
   1008     info->mask = advances[i];
   1009     info->var1.i32 = offsets[i].du;
   1010     info->var2.i32 = offsets[i].dv;
   1011   }
   1012 
   1013   /* Set glyph positions */
   1014   buffer->clear_positions ();
   1015   double x_mult = font_data->x_mult, y_mult = font_data->y_mult;
   1016   for (unsigned int i = 0; i < glyphs_len; i++)
   1017   {
   1018     hb_glyph_info_t *info = &buffer->info[i];
   1019     hb_glyph_position_t *pos = &buffer->pos[i];
   1020 
   1021     /* TODO vertical */
   1022     pos->x_advance = x_mult * (int32_t) info->mask;
   1023     pos->x_offset = x_mult * (backward ? -info->var1.i32 : info->var1.i32);
   1024     pos->y_offset = y_mult * info->var2.i32;
   1025   }
   1026 
   1027   if (backward)
   1028     hb_buffer_reverse (buffer);
   1029 
   1030   /* Wow, done! */
   1031   return true;
   1032 }
   1033 
   1034 
   1035