src/main.cc - third_party/harfbuzz - Git at Google

 /*
  * Copyright © 2007,2008,2009  Red Hat, Inc.
  * Copyright © 2018,2019,2020  Ebrahim Byagowi
  * Copyright © 2018  Khaled Hosny
  *
  *  This is part of HarfBuzz, a text shaping library.
  *
  * Permission is hereby granted, without written agreement and without
  * license or royalty fees, to use, copy, modify, and distribute this
  * software and its documentation for any purpose, provided that the
  * above copyright notice and the following two paragraphs appear in
  * all copies of this software.
  *
  * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
  * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
  * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
  * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
  * DAMAGE.
  *
  * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
  * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
  * FITNESS FOR A PARTICULAR PURPOSE.  THE SOFTWARE PROVIDED HEREUNDER IS
  * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
  * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
  *
  * Red Hat Author(s): Behdad Esfahbod
  */

 #ifdef HAVE_CONFIG_H
 #include "config.h"
 #endif

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

 #include <cassert>
 #include <cstdlib>
 #include <cstdio>
 #include <cstring>

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

 #if !defined(HB_NO_COLOR) && !defined(HB_NO_DRAW)
 static void
 svg_dump (hb_face_t *face, unsigned face_index)
 {
   unsigned glyph_count = hb_face_get_glyph_count (face);

   for (unsigned glyph_id = 0; glyph_id < glyph_count; ++glyph_id)
   {
     hb_blob_t *blob = hb_ot_color_glyph_reference_svg (face, glyph_id);

     if (hb_blob_get_length (blob) == 0) continue;

     unsigned length;
     const char *data = hb_blob_get_data (blob, &length);

     char output_path[255];
     snprintf (output_path, sizeof output_path,
 	     "out/svg-%u-%u.svg%s",
 	     glyph_id,
 	     face_index,
 	     // append "z" if the content is gzipped, https://stackoverflow.com/a/6059405
 	     (length > 2 && (data[0] == '\x1F') && (data[1] == '\x8B')) ? "z" : "");

     FILE *f = fopen (output_path, "wb");
     fwrite (data, 1, length, f);
     fclose (f);

     hb_blob_destroy (blob);
   }
 }

 /* _png API is so easy to use unlike the below code, don't get confused */
 static void
 png_dump (hb_face_t *face, unsigned face_index)
 {
   unsigned glyph_count = hb_face_get_glyph_count (face);
   hb_font_t *font = hb_font_create (face);

   /* scans the font for strikes */
   unsigned sample_glyph_id;
   /* we don't care about different strikes for different glyphs at this point */
   for (sample_glyph_id = 0; sample_glyph_id < glyph_count; ++sample_glyph_id)
   {
     hb_blob_t *blob = hb_ot_color_glyph_reference_png (font, sample_glyph_id);
     unsigned blob_length = hb_blob_get_length (blob);
     hb_blob_destroy (blob);
     if (blob_length != 0)
       break;
   }

   unsigned upem = hb_face_get_upem (face);
   unsigned blob_length = 0;
   unsigned strike = 0;
   for (unsigned ppem = 1; ppem < upem; ++ppem)
   {
     hb_font_set_ppem (font, ppem, ppem);
     hb_blob_t *blob = hb_ot_color_glyph_reference_png (font, sample_glyph_id);
     unsigned new_blob_length = hb_blob_get_length (blob);
     hb_blob_destroy (blob);
     if (new_blob_length != blob_length)
     {
       for (unsigned glyph_id = 0; glyph_id < glyph_count; ++glyph_id)
       {
 	hb_blob_t *blob = hb_ot_color_glyph_reference_png (font, glyph_id);

 	if (hb_blob_get_length (blob) == 0) continue;

 	unsigned length;
 	const char *data = hb_blob_get_data (blob, &length);

 	char output_path[255];
 	snprintf (output_path, sizeof output_path, "out/png-%u-%u-%u.png", glyph_id, strike, face_index);

 	FILE *f = fopen (output_path, "wb");
 	fwrite (data, 1, length, f);
 	fclose (f);

 	hb_blob_destroy (blob);
       }

       strike++;
       blob_length = new_blob_length;
     }
   }

   hb_font_destroy (font);
 }

 struct draw_data_t
 {
   FILE *f;
   hb_position_t ascender;
 };

 static void
 move_to (hb_draw_funcs_t *, draw_data_t *draw_data,
 	 hb_draw_state_t *,
 	 float to_x, float to_y,
 	 void *)
 {
   fprintf (draw_data->f, "M%g,%g", to_x, draw_data->ascender - to_y);
 }

 static void
 line_to (hb_draw_funcs_t *, draw_data_t *draw_data,
 	 hb_draw_state_t *,
 	 float to_x, float to_y,
 	 void *)
 {
   fprintf (draw_data->f, "L%g,%g", to_x, draw_data->ascender - to_y);
 }

 static void
 quadratic_to (hb_draw_funcs_t *, draw_data_t *draw_data,
 	      hb_draw_state_t *,
 	      float control_x, float control_y,
 	      float to_x, float to_y,
 	      void *)
 {
   fprintf (draw_data->f, "Q%g,%g %g,%g", control_x, draw_data->ascender - control_y,
 					to_x, draw_data->ascender - to_y);
 }

 static void
 cubic_to (hb_draw_funcs_t *, draw_data_t *draw_data,
 	  hb_draw_state_t *,
 	  float control1_x, float control1_y,
 	  float control2_x, float control2_y,
 	  float to_x, float to_y,
 	  void *)
 {
   fprintf (draw_data->f, "C%g,%g %g,%g %g,%g", control1_x, draw_data->ascender - control1_y,
 					       control2_x, draw_data->ascender - control2_y,
 					       to_x, draw_data->ascender - to_y);
 }

 static void
 close_path (hb_draw_funcs_t *, draw_data_t *draw_data,
 	    hb_draw_state_t *,
 	    void *)
 {
   fprintf (draw_data->f, "Z");
 }

 static void
 layered_glyph_dump (hb_font_t *font, hb_draw_funcs_t *funcs, unsigned face_index)
 {
   hb_face_t *face = hb_font_get_face (font);
   unsigned palette_count = hb_ot_color_palette_get_count (face);
   for (unsigned palette = 0; palette < palette_count; ++palette)
   {
     unsigned num_colors = hb_ot_color_palette_get_colors (face, palette, 0, nullptr, nullptr);
     if (!num_colors) continue;

     hb_color_t *colors = (hb_color_t*) calloc (num_colors, sizeof (hb_color_t));
     hb_ot_color_palette_get_colors (face, palette, 0, &num_colors, colors);
     if (!num_colors)
     {
       free (colors);
       continue;
     }

     unsigned num_glyphs = hb_face_get_glyph_count (face);
     for (hb_codepoint_t gid = 0; gid < num_glyphs; ++gid)
     {
       unsigned num_layers = hb_ot_color_glyph_get_layers (face, gid, 0, nullptr, nullptr);
       if (!num_layers) continue;

       hb_ot_color_layer_t *layers = (hb_ot_color_layer_t*) malloc (num_layers * sizeof (hb_ot_color_layer_t));

       hb_ot_color_glyph_get_layers (face, gid, 0, &num_layers, layers);
       if (num_layers)
       {
 	hb_font_extents_t font_extents;
 	hb_font_get_extents_for_direction (font, HB_DIRECTION_LTR, &font_extents);
 	hb_glyph_extents_t extents = {0};
 	if (!hb_font_get_glyph_extents (font, gid, &extents))
 	{
 	  printf ("Skip gid: %u\n", gid);
 	  continue;
 	}

 	char output_path[255];
 	snprintf (output_path, sizeof output_path, "out/colr-%u-%u-%u.svg", gid, palette, face_index);
 	FILE *f = fopen (output_path, "wb");
 	fprintf (f, "<svg xmlns=\"http://www.w3.org/2000/svg\""
 		    " viewBox=\"%d %d %d %d\">\n",
 		    extents.x_bearing, 0,
 		    extents.x_bearing + extents.width, -extents.height);
 	draw_data_t draw_data;
 	draw_data.ascender = extents.y_bearing;
 	draw_data.f = f;

 	for (unsigned layer = 0; layer < num_layers; ++layer)
 	{
 	  hb_color_t color = 0x000000FF;
 	  if (layers[layer].color_index != 0xFFFF)
 	    color = colors[layers[layer].color_index];
 	  fprintf (f, "<path fill=\"#%02X%02X%02X\" ",
 		   hb_color_get_red (color), hb_color_get_green (color), hb_color_get_green (color));
 	  if (hb_color_get_alpha (color) != 255)
 	    fprintf (f, "fill-opacity=\"%.3f\"", (double) hb_color_get_alpha (color) / 255.);
 	  fprintf (f, "d=\"");
 	  hb_font_draw_glyph (font, layers[layer].glyph, funcs, &draw_data);
 	  fprintf (f, "\"/>\n");
 	}

 	fprintf (f, "</svg>");
 	fclose (f);
       }
       free (layers);
     }

     free (colors);
   }
 }

 static void
 dump_glyphs (hb_font_t *font, hb_draw_funcs_t *funcs, unsigned face_index)
 {
   unsigned num_glyphs = hb_face_get_glyph_count (hb_font_get_face (font));
   for (unsigned gid = 0; gid < num_glyphs; ++gid)
   {
     hb_font_extents_t font_extents;
     hb_font_get_extents_for_direction (font, HB_DIRECTION_LTR, &font_extents);
     hb_glyph_extents_t extents = {0};
     if (!hb_font_get_glyph_extents (font, gid, &extents))
     {
       printf ("Skip gid: %u\n", gid);
       continue;
     }

     char output_path[255];
     snprintf (output_path, sizeof output_path, "out/%u-%u.svg", face_index, gid);
     FILE *f = fopen (output_path, "wb");
     fprintf (f, "<svg xmlns=\"http://www.w3.org/2000/svg\""
 		" viewBox=\"%d %d %d %d\"><path d=\"",
 		extents.x_bearing, 0,
 		extents.x_bearing + extents.width, font_extents.ascender - font_extents.descender);
     draw_data_t draw_data;
     draw_data.ascender = font_extents.ascender;
     draw_data.f = f;
     hb_font_draw_glyph (font, gid, funcs, &draw_data);
     fprintf (f, "\"/></svg>");
     fclose (f);
   }
 }

 static void
 dump_glyphs (hb_blob_t *blob, const char *font_name)
 {
   FILE *font_name_file = fopen ("out/.dumped_font_name", "r");
   if (font_name_file)
   {
     fprintf (stderr, "Purge or rename ./out folder if you like to run a glyph dump,\n"
 		     "run it like `rm -rf out && mkdir out && src/main font-file.ttf`\n");
     return;
   }

   font_name_file = fopen ("out/.dumped_font_name", "w");
   if (!font_name_file)
   {
     fprintf (stderr, "./out is not accessible as a folder, create it please\n");
     return;
   }
   fwrite (font_name, 1, strlen (font_name), font_name_file);
   fclose (font_name_file);

   hb_draw_funcs_t *funcs = hb_draw_funcs_create ();
   hb_draw_funcs_set_move_to_func (funcs, (hb_draw_move_to_func_t) move_to, nullptr, nullptr);
   hb_draw_funcs_set_line_to_func (funcs, (hb_draw_line_to_func_t) line_to, nullptr, nullptr);
   hb_draw_funcs_set_quadratic_to_func (funcs, (hb_draw_quadratic_to_func_t) quadratic_to, nullptr, nullptr);
   hb_draw_funcs_set_cubic_to_func (funcs, (hb_draw_cubic_to_func_t) cubic_to, nullptr, nullptr);
   hb_draw_funcs_set_close_path_func (funcs, (hb_draw_close_path_func_t) close_path, nullptr, nullptr);

   unsigned num_faces = hb_face_count (blob);
   for (unsigned face_index = 0; face_index < num_faces; ++face_index)
   {
     hb_face_t *face = hb_face_create (blob, face_index);
     hb_font_t *font = hb_font_create (face);

     if (hb_ot_color_has_png (face))
       printf ("Dumping png (CBDT/sbix)...\n");
     png_dump (face, face_index);

     if (hb_ot_color_has_svg (face))
       printf ("Dumping svg (SVG )...\n");
     svg_dump (face, face_index);

     if (hb_ot_color_has_layers (face) && hb_ot_color_has_palettes (face))
       printf ("Dumping layered color glyphs (COLR/CPAL)...\n");
     layered_glyph_dump (font, funcs, face_index);

     dump_glyphs (font, funcs, face_index);

     hb_font_destroy (font);
     hb_face_destroy (face);
   }

   hb_draw_funcs_destroy (funcs);
 }
 #endif

 #ifndef MAIN_CC_NO_PRIVATE_API
 /* Only this part of this mini app uses private API */
 #include "hb-static.cc"
 #include "hb-open-file.hh"
 #include "hb-ot-layout-gdef-table.hh"
 #include "hb-ot-layout-gsubgpos.hh"

 using namespace OT;

 static void
 print_layout_info_using_private_api (hb_blob_t *blob)
 {
   const char *font_data = hb_blob_get_data (blob, nullptr);
   hb_blob_t *font_blob = hb_sanitize_context_t ().sanitize_blob<OpenTypeFontFile> (blob);
   const OpenTypeFontFile* sanitized = font_blob->as<OpenTypeFontFile> ();
   if (!font_blob->data)
   {
     printf ("Sanitization of the file wasn't successful. Exit");
     exit (1);
   }
   const OpenTypeFontFile& ot = *sanitized;

   switch (ot.get_tag ())
   {
   case OpenTypeFontFile::TrueTypeTag:
     printf ("OpenType font with TrueType outlines\n");
     break;
   case OpenTypeFontFile::CFFTag:
     printf ("OpenType font with CFF (Type1) outlines\n");
     break;
   case OpenTypeFontFile::TTCTag:
     printf ("TrueType Collection of OpenType fonts\n");
     break;
   case OpenTypeFontFile::TrueTag:
     printf ("Obsolete Apple TrueType font\n");
     break;
   case OpenTypeFontFile::Typ1Tag:
     printf ("Obsolete Apple Type1 font in SFNT container\n");
     break;
   case OpenTypeFontFile::DFontTag:
     printf ("DFont Mac Resource Fork\n");
     break;
   default:
     printf ("Unknown font format\n");
     break;
   }

   unsigned num_faces = hb_face_count (blob);
   printf ("%u font(s) found in file\n", num_faces);
   for (unsigned n_font = 0; n_font < num_faces; ++n_font)
   {
     const OpenTypeFontFace &font = ot.get_face (n_font);
     printf ("Font %u of %u:\n", n_font, num_faces);

     unsigned num_tables = font.get_table_count ();
     printf ("  %u table(s) found in font\n", num_tables);
     for (unsigned n_table = 0; n_table < num_tables; ++n_table)
     {
       const OpenTypeTable &table = font.get_table (n_table);
       printf ("  Table %2u of %2u: %.4s (0x%08x+0x%08x)\n", n_table, num_tables,
 	      (const char *) table.tag,
 	      (unsigned) table.offset,
 	      (unsigned) table.length);

       switch (table.tag)
       {

       case HB_OT_TAG_GSUB:
       case HB_OT_TAG_GPOS:
 	{

 	const GSUBGPOS &g = *reinterpret_cast<const GSUBGPOS *> (font_data + table.offset);

 	unsigned num_scripts = g.get_script_count ();
 	printf ("    %u script(s) found in table\n", num_scripts);
 	for (unsigned n_script = 0; n_script < num_scripts; ++n_script)
 	{
 	  const Script &script = g.get_script (n_script);
 	  printf ("    Script %2u of %2u: %.4s\n", n_script, num_scripts,
 		  (const char *) g.get_script_tag (n_script));

 	  if (!script.has_default_lang_sys ())
 	    printf ("      No default language system\n");
 	  int num_langsys = script.get_lang_sys_count ();
 	  printf ("      %d language system(s) found in script\n", num_langsys);
 	  for (int n_langsys = script.has_default_lang_sys () ? -1 : 0; n_langsys < num_langsys; ++n_langsys)
 	  {
 	    const LangSys &langsys = n_langsys == -1
 				   ? script.get_default_lang_sys ()
 				   : script.get_lang_sys (n_langsys);
 	    if (n_langsys == -1)
 	      printf ("      Default Language System\n");
 	    else
 	      printf ("      Language System %2d of %2d: %.4s\n", n_langsys, num_langsys,
 		      (const char *) script.get_lang_sys_tag (n_langsys));
 	    if (!langsys.has_required_feature ())
 	      printf ("        No required feature\n");
 	    else
 	      printf ("        Required feature index: %u\n",
 		      langsys.get_required_feature_index ());

 	    unsigned num_features = langsys.get_feature_count ();
 	    printf ("        %u feature(s) found in language system\n", num_features);
 	    for (unsigned n_feature = 0; n_feature < num_features; ++n_feature)
 	    {
 	      printf ("        Feature index %2u of %2u: %u\n", n_feature, num_features,
 		      langsys.get_feature_index (n_feature));
 	    }
 	  }
 	}

 	unsigned num_features = g.get_feature_count ();
 	printf ("    %u feature(s) found in table\n", num_features);
 	for (unsigned n_feature = 0; n_feature < num_features; ++n_feature)
 	{
 	  const Feature &feature = g.get_feature (n_feature);
 	  unsigned num_lookups = feature.get_lookup_count ();
 	  printf ("    Feature %2u of %2u: %c%c%c%c\n", n_feature, num_features,
 		  HB_UNTAG (g.get_feature_tag (n_feature)));

 	  printf ("        %u lookup(s) found in feature\n", num_lookups);
 	  for (unsigned n_lookup = 0; n_lookup < num_lookups; ++n_lookup) {
 	    printf ("        Lookup index %2u of %2u: %u\n", n_lookup, num_lookups,
 		    feature.get_lookup_index (n_lookup));
 	  }
 	}

 	unsigned num_lookups = g.get_lookup_count ();
 	printf ("    %u lookup(s) found in table\n", num_lookups);
 	for (unsigned n_lookup = 0; n_lookup < num_lookups; ++n_lookup)
 	{
 	  const Lookup &lookup = g.get_lookup (n_lookup);
 	  printf ("    Lookup %2u of %2u: type %u, props 0x%04X\n", n_lookup, num_lookups,
 		  lookup.get_type (), lookup.get_props ());
 	}

 	}
 	break;

       case GDEF::tableTag:
 	{

 	const GDEF &gdef = *reinterpret_cast<const GDEF *> (font_data + table.offset);

 	printf ("    Has %sglyph classes\n",
 		  gdef.has_glyph_classes () ? "" : "no ");
 	printf ("    Has %smark attachment types\n",
 		  gdef.has_mark_attachment_types () ? "" : "no ");
 	printf ("    Has %sattach list\n",
 		  gdef.has_attach_list () ? "" : "no ");
 	printf ("    Has %slig carets\n",
 		  gdef.has_lig_carets () ? "" : "no ");
 	printf ("    Has %smark glyph sets\n",
 		  gdef.has_mark_glyph_sets () ? "" : "no ");
 	break;
 	}
       }
     }
   }
 }
 /* end of private API use */
 #endif

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

   hb_blob_t *blob = hb_blob_create_from_file_or_fail (argv[1]);
   assert (blob);
   printf ("Opened font file %s: %u bytes long\n", argv[1], hb_blob_get_length (blob));
 #ifndef MAIN_CC_NO_PRIVATE_API
   print_layout_info_using_private_api (blob);
 #endif
 #if !defined(HB_NO_COLOR) && !defined(HB_NO_DRAW)
   dump_glyphs (blob, argv[1]);
 #endif
   hb_blob_destroy (blob);

   return 0;
 }
	/*
	* Copyright © 2007,2008,2009 Red Hat, Inc.
	* Copyright © 2018,2019,2020 Ebrahim Byagowi
	* Copyright © 2018 Khaled Hosny
	*
	* This is part of HarfBuzz, a text shaping library.
	*
	* Permission is hereby granted, without written agreement and without
	* license or royalty fees, to use, copy, modify, and distribute this
	* software and its documentation for any purpose, provided that the
	* above copyright notice and the following two paragraphs appear in
	* all copies of this software.
	*
	* IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
	* DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
	* ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
	* IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
	* DAMAGE.
	*
	* THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
	* BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
	* FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
	* ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
	* PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
	*
	* Red Hat Author(s): Behdad Esfahbod
	*/

	#ifdef HAVE_CONFIG_H
	#include "config.h"
	#endif

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

	#include <cassert>
	#include <cstdlib>
	#include <cstdio>
	#include <cstring>

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

	#if !defined(HB_NO_COLOR) && !defined(HB_NO_DRAW)
	static void
	svg_dump (hb_face_t *face, unsigned face_index)
	{
	unsigned glyph_count = hb_face_get_glyph_count (face);

	for (unsigned glyph_id = 0; glyph_id < glyph_count; ++glyph_id)
	{
	hb_blob_t *blob = hb_ot_color_glyph_reference_svg (face, glyph_id);

	if (hb_blob_get_length (blob) == 0) continue;

	unsigned length;
	const char *data = hb_blob_get_data (blob, &length);

	char output_path[255];
	snprintf (output_path, sizeof output_path,
	"out/svg-%u-%u.svg%s",
	glyph_id,
	face_index,
	// append "z" if the content is gzipped, https://stackoverflow.com/a/6059405
	(length > 2 && (data[0] == '\x1F') && (data[1] == '\x8B')) ? "z" : "");

	FILE *f = fopen (output_path, "wb");
	fwrite (data, 1, length, f);
	fclose (f);

	hb_blob_destroy (blob);
	}
	}

	/* _png API is so easy to use unlike the below code, don't get confused */
	static void
	png_dump (hb_face_t *face, unsigned face_index)
	{
	unsigned glyph_count = hb_face_get_glyph_count (face);
	hb_font_t *font = hb_font_create (face);

	/* scans the font for strikes */
	unsigned sample_glyph_id;
	/* we don't care about different strikes for different glyphs at this point */
	for (sample_glyph_id = 0; sample_glyph_id < glyph_count; ++sample_glyph_id)
	{
	hb_blob_t *blob = hb_ot_color_glyph_reference_png (font, sample_glyph_id);
	unsigned blob_length = hb_blob_get_length (blob);
	hb_blob_destroy (blob);
	if (blob_length != 0)
	break;
	}

	unsigned upem = hb_face_get_upem (face);
	unsigned blob_length = 0;
	unsigned strike = 0;
	for (unsigned ppem = 1; ppem < upem; ++ppem)
	{
	hb_font_set_ppem (font, ppem, ppem);
	hb_blob_t *blob = hb_ot_color_glyph_reference_png (font, sample_glyph_id);
	unsigned new_blob_length = hb_blob_get_length (blob);
	hb_blob_destroy (blob);
	if (new_blob_length != blob_length)
	{
	for (unsigned glyph_id = 0; glyph_id < glyph_count; ++glyph_id)
	{
	hb_blob_t *blob = hb_ot_color_glyph_reference_png (font, glyph_id);

	if (hb_blob_get_length (blob) == 0) continue;

	unsigned length;
	const char *data = hb_blob_get_data (blob, &length);

	char output_path[255];
	snprintf (output_path, sizeof output_path, "out/png-%u-%u-%u.png", glyph_id, strike, face_index);

	FILE *f = fopen (output_path, "wb");
	fwrite (data, 1, length, f);
	fclose (f);

	hb_blob_destroy (blob);
	}

	strike++;
	blob_length = new_blob_length;
	}
	}

	hb_font_destroy (font);
	}

	struct draw_data_t
	{
	FILE *f;
	hb_position_t ascender;
	};

	static void
	move_to (hb_draw_funcs_t , draw_data_t draw_data,
	hb_draw_state_t *,
	float to_x, float to_y,
	void *)
	{
	fprintf (draw_data->f, "M%g,%g", to_x, draw_data->ascender - to_y);
	}

	static void
	line_to (hb_draw_funcs_t , draw_data_t draw_data,
	hb_draw_state_t *,
	float to_x, float to_y,
	void *)
	{
	fprintf (draw_data->f, "L%g,%g", to_x, draw_data->ascender - to_y);
	}

	static void
	quadratic_to (hb_draw_funcs_t , draw_data_t draw_data,
	hb_draw_state_t *,
	float control_x, float control_y,
	float to_x, float to_y,
	void *)
	{
	fprintf (draw_data->f, "Q%g,%g %g,%g", control_x, draw_data->ascender - control_y,
	to_x, draw_data->ascender - to_y);
	}

	static void
	cubic_to (hb_draw_funcs_t , draw_data_t draw_data,
	hb_draw_state_t *,
	float control1_x, float control1_y,
	float control2_x, float control2_y,
	float to_x, float to_y,
	void *)
	{
	fprintf (draw_data->f, "C%g,%g %g,%g %g,%g", control1_x, draw_data->ascender - control1_y,
	control2_x, draw_data->ascender - control2_y,
	to_x, draw_data->ascender - to_y);
	}

	static void
	close_path (hb_draw_funcs_t , draw_data_t draw_data,
	hb_draw_state_t *,
	void *)
	{
	fprintf (draw_data->f, "Z");
	}

	static void
	layered_glyph_dump (hb_font_t font, hb_draw_funcs_t funcs, unsigned face_index)
	{
	hb_face_t *face = hb_font_get_face (font);
	unsigned palette_count = hb_ot_color_palette_get_count (face);
	for (unsigned palette = 0; palette < palette_count; ++palette)
	{
	unsigned num_colors = hb_ot_color_palette_get_colors (face, palette, 0, nullptr, nullptr);
	if (!num_colors) continue;

	hb_color_t colors = (hb_color_t) calloc (num_colors, sizeof (hb_color_t));
	hb_ot_color_palette_get_colors (face, palette, 0, &num_colors, colors);
	if (!num_colors)
	{
	free (colors);
	continue;
	}

	unsigned num_glyphs = hb_face_get_glyph_count (face);
	for (hb_codepoint_t gid = 0; gid < num_glyphs; ++gid)
	{
	unsigned num_layers = hb_ot_color_glyph_get_layers (face, gid, 0, nullptr, nullptr);
	if (!num_layers) continue;

	hb_ot_color_layer_t layers = (hb_ot_color_layer_t) malloc (num_layers * sizeof (hb_ot_color_layer_t));

	hb_ot_color_glyph_get_layers (face, gid, 0, &num_layers, layers);
	if (num_layers)
	{
	hb_font_extents_t font_extents;
	hb_font_get_extents_for_direction (font, HB_DIRECTION_LTR, &font_extents);
	hb_glyph_extents_t extents = {0};
	if (!hb_font_get_glyph_extents (font, gid, &extents))
	{
	printf ("Skip gid: %u\n", gid);
	continue;
	}

	char output_path[255];
	snprintf (output_path, sizeof output_path, "out/colr-%u-%u-%u.svg", gid, palette, face_index);
	FILE *f = fopen (output_path, "wb");
	fprintf (f, "<svg xmlns=\"http://www.w3.org/2000/svg\""
	" viewBox=\"%d %d %d %d\">\n",
	extents.x_bearing, 0,
	extents.x_bearing + extents.width, -extents.height);
	draw_data_t draw_data;
	draw_data.ascender = extents.y_bearing;
	draw_data.f = f;

	for (unsigned layer = 0; layer < num_layers; ++layer)
	{
	hb_color_t color = 0x000000FF;
	if (layers[layer].color_index != 0xFFFF)
	color = colors[layers[layer].color_index];
	fprintf (f, "<path fill=\"#%02X%02X%02X\" ",
	hb_color_get_red (color), hb_color_get_green (color), hb_color_get_green (color));
	if (hb_color_get_alpha (color) != 255)
	fprintf (f, "fill-opacity=\"%.3f\"", (double) hb_color_get_alpha (color) / 255.);
	fprintf (f, "d=\"");
	hb_font_draw_glyph (font, layers[layer].glyph, funcs, &draw_data);
	fprintf (f, "\"/>\n");
	}

	fprintf (f, "</svg>");
	fclose (f);
	}
	free (layers);
	}

	free (colors);
	}
	}

	static void
	dump_glyphs (hb_font_t font, hb_draw_funcs_t funcs, unsigned face_index)
	{
	unsigned num_glyphs = hb_face_get_glyph_count (hb_font_get_face (font));
	for (unsigned gid = 0; gid < num_glyphs; ++gid)
	{
	hb_font_extents_t font_extents;
	hb_font_get_extents_for_direction (font, HB_DIRECTION_LTR, &font_extents);
	hb_glyph_extents_t extents = {0};
	if (!hb_font_get_glyph_extents (font, gid, &extents))
	{
	printf ("Skip gid: %u\n", gid);
	continue;
	}

	char output_path[255];
	snprintf (output_path, sizeof output_path, "out/%u-%u.svg", face_index, gid);
	FILE *f = fopen (output_path, "wb");
	fprintf (f, "<svg xmlns=\"http://www.w3.org/2000/svg\""
	" viewBox=\"%d %d %d %d\"><path d=\"",
	extents.x_bearing, 0,
	extents.x_bearing + extents.width, font_extents.ascender - font_extents.descender);
	draw_data_t draw_data;
	draw_data.ascender = font_extents.ascender;
	draw_data.f = f;
	hb_font_draw_glyph (font, gid, funcs, &draw_data);
	fprintf (f, "\"/></svg>");
	fclose (f);
	}
	}

	static void
	dump_glyphs (hb_blob_t blob, const char font_name)
	{
	FILE *font_name_file = fopen ("out/.dumped_font_name", "r");
	if (font_name_file)
	{
	fprintf (stderr, "Purge or rename ./out folder if you like to run a glyph dump,\n"
	"run it like `rm -rf out && mkdir out && src/main font-file.ttf`\n");
	return;
	}

	font_name_file = fopen ("out/.dumped_font_name", "w");
	if (!font_name_file)
	{
	fprintf (stderr, "./out is not accessible as a folder, create it please\n");
	return;
	}
	fwrite (font_name, 1, strlen (font_name), font_name_file);
	fclose (font_name_file);

	hb_draw_funcs_t *funcs = hb_draw_funcs_create ();
	hb_draw_funcs_set_move_to_func (funcs, (hb_draw_move_to_func_t) move_to, nullptr, nullptr);
	hb_draw_funcs_set_line_to_func (funcs, (hb_draw_line_to_func_t) line_to, nullptr, nullptr);
	hb_draw_funcs_set_quadratic_to_func (funcs, (hb_draw_quadratic_to_func_t) quadratic_to, nullptr, nullptr);
	hb_draw_funcs_set_cubic_to_func (funcs, (hb_draw_cubic_to_func_t) cubic_to, nullptr, nullptr);
	hb_draw_funcs_set_close_path_func (funcs, (hb_draw_close_path_func_t) close_path, nullptr, nullptr);

	unsigned num_faces = hb_face_count (blob);
	for (unsigned face_index = 0; face_index < num_faces; ++face_index)
	{
	hb_face_t *face = hb_face_create (blob, face_index);
	hb_font_t *font = hb_font_create (face);

	if (hb_ot_color_has_png (face))
	printf ("Dumping png (CBDT/sbix)...\n");
	png_dump (face, face_index);

	if (hb_ot_color_has_svg (face))
	printf ("Dumping svg (SVG )...\n");
	svg_dump (face, face_index);

	if (hb_ot_color_has_layers (face) && hb_ot_color_has_palettes (face))
	printf ("Dumping layered color glyphs (COLR/CPAL)...\n");
	layered_glyph_dump (font, funcs, face_index);

	dump_glyphs (font, funcs, face_index);

	hb_font_destroy (font);
	hb_face_destroy (face);
	}

	hb_draw_funcs_destroy (funcs);
	}
	#endif

	#ifndef MAIN_CC_NO_PRIVATE_API
	/* Only this part of this mini app uses private API */
	#include "hb-static.cc"
	#include "hb-open-file.hh"
	#include "hb-ot-layout-gdef-table.hh"
	#include "hb-ot-layout-gsubgpos.hh"

	using namespace OT;

	static void
	print_layout_info_using_private_api (hb_blob_t *blob)
	{
	const char *font_data = hb_blob_get_data (blob, nullptr);
	hb_blob_t *font_blob = hb_sanitize_context_t ().sanitize_blob<OpenTypeFontFile> (blob);
	const OpenTypeFontFile* sanitized = font_blob->as<OpenTypeFontFile> ();
	if (!font_blob->data)
	{
	printf ("Sanitization of the file wasn't successful. Exit");
	exit (1);
	}
	const OpenTypeFontFile& ot = *sanitized;

	switch (ot.get_tag ())
	{
	case OpenTypeFontFile::TrueTypeTag:
	printf ("OpenType font with TrueType outlines\n");
	break;
	case OpenTypeFontFile::CFFTag:
	printf ("OpenType font with CFF (Type1) outlines\n");
	break;
	case OpenTypeFontFile::TTCTag:
	printf ("TrueType Collection of OpenType fonts\n");
	break;
	case OpenTypeFontFile::TrueTag:
	printf ("Obsolete Apple TrueType font\n");
	break;
	case OpenTypeFontFile::Typ1Tag:
	printf ("Obsolete Apple Type1 font in SFNT container\n");
	break;
	case OpenTypeFontFile::DFontTag:
	printf ("DFont Mac Resource Fork\n");
	break;
	default:
	printf ("Unknown font format\n");
	break;
	}

	unsigned num_faces = hb_face_count (blob);
	printf ("%u font(s) found in file\n", num_faces);
	for (unsigned n_font = 0; n_font < num_faces; ++n_font)
	{
	const OpenTypeFontFace &font = ot.get_face (n_font);
	printf ("Font %u of %u:\n", n_font, num_faces);

	unsigned num_tables = font.get_table_count ();
	printf (" %u table(s) found in font\n", num_tables);
	for (unsigned n_table = 0; n_table < num_tables; ++n_table)
	{
	const OpenTypeTable &table = font.get_table (n_table);
	printf (" Table %2u of %2u: %.4s (0x%08x+0x%08x)\n", n_table, num_tables,
	(const char *) table.tag,
	(unsigned) table.offset,
	(unsigned) table.length);

	switch (table.tag)
	{

	case HB_OT_TAG_GSUB:
	case HB_OT_TAG_GPOS:
	{

	const GSUBGPOS &g = reinterpret_cast<const GSUBGPOS > (font_data + table.offset);

	unsigned num_scripts = g.get_script_count ();
	printf (" %u script(s) found in table\n", num_scripts);
	for (unsigned n_script = 0; n_script < num_scripts; ++n_script)
	{
	const Script &script = g.get_script (n_script);
	printf (" Script %2u of %2u: %.4s\n", n_script, num_scripts,
	(const char *) g.get_script_tag (n_script));

	if (!script.has_default_lang_sys ())
	printf (" No default language system\n");
	int num_langsys = script.get_lang_sys_count ();
	printf (" %d language system(s) found in script\n", num_langsys);
	for (int n_langsys = script.has_default_lang_sys () ? -1 : 0; n_langsys < num_langsys; ++n_langsys)
	{
	const LangSys &langsys = n_langsys == -1
	? script.get_default_lang_sys ()
	: script.get_lang_sys (n_langsys);
	if (n_langsys == -1)
	printf (" Default Language System\n");
	else
	printf (" Language System %2d of %2d: %.4s\n", n_langsys, num_langsys,
	(const char *) script.get_lang_sys_tag (n_langsys));
	if (!langsys.has_required_feature ())
	printf (" No required feature\n");
	else
	printf (" Required feature index: %u\n",
	langsys.get_required_feature_index ());

	unsigned num_features = langsys.get_feature_count ();
	printf (" %u feature(s) found in language system\n", num_features);
	for (unsigned n_feature = 0; n_feature < num_features; ++n_feature)
	{
	printf (" Feature index %2u of %2u: %u\n", n_feature, num_features,
	langsys.get_feature_index (n_feature));
	}
	}
	}

	unsigned num_features = g.get_feature_count ();
	printf (" %u feature(s) found in table\n", num_features);
	for (unsigned n_feature = 0; n_feature < num_features; ++n_feature)
	{
	const Feature &feature = g.get_feature (n_feature);
	unsigned num_lookups = feature.get_lookup_count ();
	printf (" Feature %2u of %2u: %c%c%c%c\n", n_feature, num_features,
	HB_UNTAG (g.get_feature_tag (n_feature)));

	printf (" %u lookup(s) found in feature\n", num_lookups);
	for (unsigned n_lookup = 0; n_lookup < num_lookups; ++n_lookup) {
	printf (" Lookup index %2u of %2u: %u\n", n_lookup, num_lookups,
	feature.get_lookup_index (n_lookup));
	}
	}

	unsigned num_lookups = g.get_lookup_count ();
	printf (" %u lookup(s) found in table\n", num_lookups);
	for (unsigned n_lookup = 0; n_lookup < num_lookups; ++n_lookup)
	{
	const Lookup &lookup = g.get_lookup (n_lookup);
	printf (" Lookup %2u of %2u: type %u, props 0x%04X\n", n_lookup, num_lookups,
	lookup.get_type (), lookup.get_props ());
	}

	}
	break;

	case GDEF::tableTag:
	{

	const GDEF &gdef = reinterpret_cast<const GDEF > (font_data + table.offset);

	printf (" Has %sglyph classes\n",
	gdef.has_glyph_classes () ? "" : "no ");
	printf (" Has %smark attachment types\n",
	gdef.has_mark_attachment_types () ? "" : "no ");
	printf (" Has %sattach list\n",
	gdef.has_attach_list () ? "" : "no ");
	printf (" Has %slig carets\n",
	gdef.has_lig_carets () ? "" : "no ");
	printf (" Has %smark glyph sets\n",
	gdef.has_mark_glyph_sets () ? "" : "no ");
	break;
	}
	}
	}
	}
	}
	/* end of private API use */
	#endif

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

	hb_blob_t *blob = hb_blob_create_from_file_or_fail (argv[1]);
	assert (blob);
	printf ("Opened font file %s: %u bytes long\n", argv[1], hb_blob_get_length (blob));
	#ifndef MAIN_CC_NO_PRIVATE_API
	print_layout_info_using_private_api (blob);
	#endif
	#if !defined(HB_NO_COLOR) && !defined(HB_NO_DRAW)
	dump_glyphs (blob, argv[1]);
	#endif
	hb_blob_destroy (blob);

	return 0;
	}