src/hb-uniscribe.cc - platform/external/harfbuzz_ng - Git at Google

 /*
  * Copyright © 2011,2012  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 "hb-uniscribe.h"

 #include "hb-ot-name-table.hh"
 #include "hb-ot-tag.h"


 #ifndef HB_DEBUG_UNISCRIBE
 #define HB_DEBUG_UNISCRIBE (HB_DEBUG+0)
 #endif


 /*
 DWORD GetFontData(
   __in   HDC hdc,
   __in   DWORD dwTable,
   __in   DWORD dwOffset,
   __out  LPVOID lpvBuffer,
   __in   DWORD cbData
 );
 */


 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_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;

   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 (UNISCRIBE, face, "Face has empty blob");

   DWORD num_fonts_installed;
   data->fh = AddFontMemResourceEx ((void *) blob_data, blob_length, 0, &num_fonts_installed);
   hb_blob_destroy (blob);
   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_blob_t *blob = OT::Sanitizer<OT::name>::sanitize (hb_face_reference_table (font->face, HB_TAG ('n','a','m','e')));
   const OT::name *name_table = OT::Sanitizer<OT::name>::lock_instance (blob);
   unsigned int len = name_table->get_name (3, 1, 0x409, 4,
 					   lf->lfFaceName,
 					   sizeof (lf->lfFaceName[0]) * LF_FACESIZE)
 					  / sizeof (lf->lfFaceName[0]);
   hb_blob_destroy (blob);

   if (unlikely (!len)) {
     DEBUG_MSG (UNISCRIBE, NULL, "Didn't find English name table entry");
     return false;
   }
   if (unlikely (len >= LF_FACESIZE)) {
     DEBUG_MSG (UNISCRIBE, NULL, "Font name too long");
     return false;
   }

   for (unsigned int i = 0; i < len; i++)
     lf->lfFaceName[i] = hb_be_uint16 (lf->lfFaceName[i]);
   lf->lfFaceName[len] = 0;

   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);

 #define FAIL(...) \
   HB_STMT_START { \
     DEBUG_MSG (UNISCRIBE, NULL, __VA_ARGS__); \
     return false; \
   } HB_STMT_END;

   HRESULT hr;

 retry:

   unsigned int scratch_size;
   char *scratch = (char *) buffer->get_scratch_buffer (&scratch_size);

   /* Allocate char buffers; they all fit */

 #define ALLOCATE_ARRAY(Type, name, len) \
   Type *name = (Type *) scratch; \
   scratch += (len) * sizeof ((name)[0]); \
   scratch_size -= (len) * sizeof ((name)[0]);

 #define utf16_index() var1.u32

   WCHAR *pchars = (WCHAR *) scratch;
   unsigned int chars_len = 0;
   for (unsigned int i = 0; i < buffer->len; i++) {
     hb_codepoint_t c = buffer->info[i].codepoint;
     buffer->info[i].utf16_index() = chars_len;
     if (likely (c < 0x10000))
       pchars[chars_len++] = c;
     else if (unlikely (c >= 0x110000))
       pchars[chars_len++] = 0xFFFD;
     else {
       pchars[chars_len++] = 0xD800 + ((c - 0x10000) >> 10);
       pchars[chars_len++] = 0xDC00 + ((c - 0x10000) & ((1 << 10) - 1));
     }
   }

   ALLOCATE_ARRAY (WCHAR, wchars, chars_len);
   ALLOCATE_ARRAY (WORD, log_clusters, chars_len);
   ALLOCATE_ARRAY (SCRIPT_CHARPROP, char_props, chars_len);

   /* On Windows, we don't care about alignment...*/
   unsigned int glyphs_size = scratch_size / (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);

 #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 = ScriptItemizeOpenType (wchars,
 			      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

   int *range_char_counts = NULL;
   TEXTRANGE_PROPERTIES **range_properties = NULL;
   int range_count = 0;
   if (num_features) {
     /* TODO setup ranges */
   }

   OPENTYPE_TAG language_tag = hb_uint32_swap (hb_ot_tag_from_language (buffer->props.language));

   unsigned int glyphs_offset = 0;
   unsigned int glyphs_len;
   bool backward = HB_DIRECTION_IS_BACKWARD (buffer->props.direction);
   for (unsigned int j = 0; j < item_count; j++)
   {
     unsigned int i = backward ? item_count - 1 - j : j;
     unsigned int chars_offset = items[i].iCharPos;
     unsigned int item_chars_len = items[i + 1].iCharPos - chars_offset;

   retry_shape:
     hr = ScriptShapeOpenType (font_data->hdc,
 			      &font_data->script_cache,
 			      &items[i].a,
 			      script_tags[i],
 			      language_tag,
 			      range_char_counts,
 			      range_properties,
 			      range_count,
 			      wchars + 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 = ScriptPlaceOpenType (font_data->hdc,
 			      &font_data->script_cache,
 			      &items[i].a,
 			      script_tags[i],
 			      language_tag,
 			      range_char_counts,
 			      range_properties,
 			      range_count,
 			      wchars + 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);

     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);
   }
   if (!backward) {
     for (unsigned int i = 1; i < glyphs_len; i++)
       if (vis_clusters[i] == -1)
 	vis_clusters[i] = vis_clusters[i - 1];
   } else {
     for (int i = glyphs_len - 2; i >= 0; 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 = info->var1.u32;
     pos->y_offset = info->var2.u32;
   }

   /* Wow, done! */
   return true;
 }
	/*
	* Copyright © 2011,2012 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 "hb-uniscribe.h"

	#include "hb-ot-name-table.hh"
	#include "hb-ot-tag.h"


	#ifndef HB_DEBUG_UNISCRIBE
	#define HB_DEBUG_UNISCRIBE (HB_DEBUG+0)
	#endif


	/*
	DWORD GetFontData(
	__in HDC hdc,
	__in DWORD dwTable,
	__in DWORD dwOffset,
	__out LPVOID lpvBuffer,
	__in DWORD cbData
	);
	*/


	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_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;

	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 (UNISCRIBE, face, "Face has empty blob");

	DWORD num_fonts_installed;
	data->fh = AddFontMemResourceEx ((void *) blob_data, blob_length, 0, &num_fonts_installed);
	hb_blob_destroy (blob);
	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_blob_t *blob = OT::Sanitizer<OT::name>::sanitize (hb_face_reference_table (font->face, HB_TAG ('n','a','m','e')));
	const OT::name *name_table = OT::Sanitizer<OT::name>::lock_instance (blob);
	unsigned int len = name_table->get_name (3, 1, 0x409, 4,
	lf->lfFaceName,
	sizeof (lf->lfFaceName[0]) * LF_FACESIZE)
	/ sizeof (lf->lfFaceName[0]);
	hb_blob_destroy (blob);

	if (unlikely (!len)) {
	DEBUG_MSG (UNISCRIBE, NULL, "Didn't find English name table entry");
	return false;
	}
	if (unlikely (len >= LF_FACESIZE)) {
	DEBUG_MSG (UNISCRIBE, NULL, "Font name too long");
	return false;
	}

	for (unsigned int i = 0; i < len; i++)
	lf->lfFaceName[i] = hb_be_uint16 (lf->lfFaceName[i]);
	lf->lfFaceName[len] = 0;

	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);

	#define FAIL(...) \
	HB_STMT_START { \
	DEBUG_MSG (UNISCRIBE, NULL, __VA_ARGS__); \
	return false; \
	} HB_STMT_END;

	HRESULT hr;

	retry:

	unsigned int scratch_size;
	char scratch = (char ) buffer->get_scratch_buffer (&scratch_size);

	/* Allocate char buffers; they all fit */

	#define ALLOCATE_ARRAY(Type, name, len) \
	Type name = (Type ) scratch; \
	scratch += (len) * sizeof ((name)[0]); \
	scratch_size -= (len) * sizeof ((name)[0]);

	#define utf16_index() var1.u32

	WCHAR pchars = (WCHAR ) scratch;
	unsigned int chars_len = 0;
	for (unsigned int i = 0; i < buffer->len; i++) {
	hb_codepoint_t c = buffer->info[i].codepoint;
	buffer->info[i].utf16_index() = chars_len;
	if (likely (c < 0x10000))
	pchars[chars_len++] = c;
	else if (unlikely (c >= 0x110000))
	pchars[chars_len++] = 0xFFFD;
	else {
	pchars[chars_len++] = 0xD800 + ((c - 0x10000) >> 10);
	pchars[chars_len++] = 0xDC00 + ((c - 0x10000) & ((1 << 10) - 1));
	}
	}

	ALLOCATE_ARRAY (WCHAR, wchars, chars_len);
	ALLOCATE_ARRAY (WORD, log_clusters, chars_len);
	ALLOCATE_ARRAY (SCRIPT_CHARPROP, char_props, chars_len);

	/* On Windows, we don't care about alignment...*/
	unsigned int glyphs_size = scratch_size / (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);

	#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 = ScriptItemizeOpenType (wchars,
	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

	int *range_char_counts = NULL;
	TEXTRANGE_PROPERTIES **range_properties = NULL;
	int range_count = 0;
	if (num_features) {
	/* TODO setup ranges */
	}

	OPENTYPE_TAG language_tag = hb_uint32_swap (hb_ot_tag_from_language (buffer->props.language));

	unsigned int glyphs_offset = 0;
	unsigned int glyphs_len;
	bool backward = HB_DIRECTION_IS_BACKWARD (buffer->props.direction);
	for (unsigned int j = 0; j < item_count; j++)
	{
	unsigned int i = backward ? item_count - 1 - j : j;
	unsigned int chars_offset = items[i].iCharPos;
	unsigned int item_chars_len = items[i + 1].iCharPos - chars_offset;

	retry_shape:
	hr = ScriptShapeOpenType (font_data->hdc,
	&font_data->script_cache,
	&items[i].a,
	script_tags[i],
	language_tag,
	range_char_counts,
	range_properties,
	range_count,
	wchars + 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 = ScriptPlaceOpenType (font_data->hdc,
	&font_data->script_cache,
	&items[i].a,
	script_tags[i],
	language_tag,
	range_char_counts,
	range_properties,
	range_count,
	wchars + 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);

	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);
	}
	if (!backward) {
	for (unsigned int i = 1; i < glyphs_len; i++)
	if (vis_clusters[i] == -1)
	vis_clusters[i] = vis_clusters[i - 1];
	} else {
	for (int i = glyphs_len - 2; i >= 0; 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 = info->var1.u32;
	pos->y_offset = info->var2.u32;
	}

	/* Wow, done! */
	return true;
	}