test/api/test-subset-glyf.c - third_party/harfbuzz - Git at Google

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

 #include "hb-test.h"
 #include "hb-subset-test.h"

 /* Unit tests for hb-subset-glyf.h */

 static void check_maxp_field (uint8_t *raw_maxp, unsigned int offset, uint16_t expected_value)
 {
   uint16_t actual_value = (raw_maxp[offset] << 8) + raw_maxp[offset + 1];
   g_assert_cmpuint(expected_value, ==, actual_value);
 }

 static void check_maxp_num_glyphs (hb_face_t *face, uint16_t expected_num_glyphs, bool hints)
 {
   hb_blob_t *maxp_blob = hb_face_reference_table (face, HB_TAG ('m','a','x', 'p'));

   unsigned int maxp_len;
   uint8_t *raw_maxp = (uint8_t *) hb_blob_get_data(maxp_blob, &maxp_len);

   check_maxp_field (raw_maxp, 4, expected_num_glyphs); // numGlyphs
   if (!hints)
   {
     check_maxp_field (raw_maxp, 14, 1); // maxZones
     check_maxp_field (raw_maxp, 16, 0); // maxTwilightPoints
     check_maxp_field (raw_maxp, 18, 0); // maxStorage
     check_maxp_field (raw_maxp, 20, 0); // maxFunctionDefs
     check_maxp_field (raw_maxp, 22, 0); // maxInstructionDefs
     check_maxp_field (raw_maxp, 24, 0); // maxStackElements
     check_maxp_field (raw_maxp, 26, 0); // maxSizeOfInstructions
   }

   hb_blob_destroy (maxp_blob);
 }

 static void
 test_subset_glyf (void)
 {
   hb_face_t *face_abc = hb_test_open_font_file ("fonts/Roboto-Regular.abc.ttf");
   hb_face_t *face_ac = hb_test_open_font_file ("fonts/Roboto-Regular.ac.ttf");

   hb_set_t *codepoints = hb_set_create();
   hb_face_t *face_abc_subset;
   hb_set_add (codepoints, 97);
   hb_set_add (codepoints, 99);
   face_abc_subset = hb_subset_test_create_subset (face_abc, hb_subset_test_create_input (codepoints));
   hb_set_destroy (codepoints);

   check_maxp_num_glyphs(face_abc_subset, 3, true);
   hb_subset_test_check (face_ac, face_abc_subset, HB_TAG ('l','o','c', 'a'));
   hb_subset_test_check (face_ac, face_abc_subset, HB_TAG ('g','l','y','f'));

   hb_face_destroy (face_abc_subset);
   hb_face_destroy (face_abc);
   hb_face_destroy (face_ac);
 }

 static void
 test_subset_glyf_set_overlaps_flag (void)
 {
   hb_face_t *face_abcAE = hb_test_open_font_file ("fonts/Roboto-Regular.abcAE.ttf");
   hb_face_t *face_bAE = hb_test_open_font_file ("fonts/Roboto-Regular.bAE.ttf");

   hb_set_t *codepoints = hb_set_create();
   hb_face_t *face_abcAE_subset;
   hb_set_add (codepoints, 32);
   hb_set_add (codepoints, 98);
   hb_set_add (codepoints, 508);

   hb_subset_input_t* input = hb_subset_test_create_input (codepoints);
   hb_subset_input_set_flags (input, HB_SUBSET_FLAGS_SET_OVERLAPS_FLAG);
   face_abcAE_subset = hb_subset_test_create_subset (face_abcAE, input);
   hb_set_destroy (codepoints);

   hb_subset_test_check (face_bAE, face_abcAE_subset, HB_TAG ('l','o','c', 'a'));
   hb_subset_test_check (face_bAE, face_abcAE_subset, HB_TAG ('g','l','y','f'));

   hb_face_destroy (face_abcAE_subset);
   hb_face_destroy (face_abcAE);
   hb_face_destroy (face_bAE);
 }

 static void
 test_subset_glyf_with_input_glyphs (void)
 {
   hb_face_t *face_abc = hb_test_open_font_file ("fonts/Roboto-Regular.abc.ttf");
   hb_face_t *face_ac = hb_test_open_font_file ("fonts/Roboto-Regular.ac.ttf");

   hb_set_t *glyphs = hb_set_create();
   hb_face_t *face_abc_subset;
   hb_set_add (glyphs, 1);
   hb_set_add (glyphs, 3);
   face_abc_subset =
       hb_subset_test_create_subset (face_abc, hb_subset_test_create_input_from_glyphs (glyphs));
   hb_set_destroy (glyphs);

   hb_subset_test_check (face_ac, face_abc_subset, HB_TAG ('g','l','y','f'));
   hb_subset_test_check (face_ac, face_abc_subset, HB_TAG ('l','o','c', 'a'));
   check_maxp_num_glyphs(face_abc_subset, 3, true);

   hb_face_destroy (face_abc_subset);
   hb_face_destroy (face_abc);
   hb_face_destroy (face_ac);
 }

 static void
 test_subset_glyf_with_components (void)
 {
   hb_face_t *face_components = hb_test_open_font_file ("fonts/Roboto-Regular.components.ttf");
   hb_face_t *face_subset = hb_test_open_font_file ("fonts/Roboto-Regular.components.subset.ttf");

   hb_set_t *codepoints = hb_set_create();
   hb_face_t *face_generated_subset;
   hb_set_add (codepoints, 0x1fc);
   face_generated_subset = hb_subset_test_create_subset (face_components, hb_subset_test_create_input (codepoints));
   hb_set_destroy (codepoints);

   hb_subset_test_check (face_subset, face_generated_subset, HB_TAG ('g','l','y','f'));
   hb_subset_test_check (face_subset, face_generated_subset, HB_TAG ('l','o','c', 'a'));
   check_maxp_num_glyphs(face_generated_subset, 4, true);

   hb_face_destroy (face_generated_subset);
   hb_face_destroy (face_subset);
   hb_face_destroy (face_components);
 }

 static void
 test_subset_glyf_with_gsub (void)
 {
   hb_face_t *face_fil = hb_test_open_font_file ("fonts/Roboto-Regular.gsub.fil.ttf");
   hb_face_t *face_fi = hb_test_open_font_file ("fonts/Roboto-Regular.gsub.fi.ttf");
   hb_subset_input_t *input;
   hb_face_t *face_subset;

   hb_set_t *codepoints = hb_set_create();
   hb_set_add (codepoints, 102); // f
   hb_set_add (codepoints, 105); // i

   input = hb_subset_test_create_input (codepoints);
   hb_set_destroy (codepoints);
   hb_set_del (hb_subset_input_set (input, HB_SUBSET_SETS_DROP_TABLE_TAG), HB_TAG('G', 'S', 'U', 'B'));
   hb_set_del (hb_subset_input_set (input, HB_SUBSET_SETS_DROP_TABLE_TAG), HB_TAG('G', 'P', 'O', 'S'));
   hb_set_del (hb_subset_input_set (input, HB_SUBSET_SETS_DROP_TABLE_TAG), HB_TAG('G', 'D', 'E', 'F'));

   face_subset = hb_subset_test_create_subset (face_fil, input);

   hb_subset_test_check (face_fi, face_subset, HB_TAG ('g','l','y','f'));
   hb_subset_test_check (face_fi, face_subset, HB_TAG ('l','o','c', 'a'));
   check_maxp_num_glyphs(face_subset, 5, true);

   hb_face_destroy (face_subset);
   hb_face_destroy (face_fi);
   hb_face_destroy (face_fil);
 }

 static void
 test_subset_glyf_without_gsub (void)
 {
   hb_face_t *face_fil = hb_test_open_font_file ("fonts/Roboto-Regular.gsub.fil.ttf");
   hb_face_t *face_fi = hb_test_open_font_file ("fonts/Roboto-Regular.nogsub.fi.ttf");
   hb_subset_input_t *input;
   hb_face_t *face_subset;

   hb_set_t *codepoints = hb_set_create();
   hb_set_add (codepoints, 102); // f
   hb_set_add (codepoints, 105); // i

   input = hb_subset_test_create_input (codepoints);
   hb_set_destroy (codepoints);
   hb_set_add (hb_subset_input_set (input, HB_SUBSET_SETS_DROP_TABLE_TAG), HB_TAG('G', 'S', 'U', 'B'));
   hb_set_add (hb_subset_input_set (input, HB_SUBSET_SETS_DROP_TABLE_TAG), HB_TAG('G', 'P', 'O', 'S'));
   hb_set_add (hb_subset_input_set (input, HB_SUBSET_SETS_DROP_TABLE_TAG), HB_TAG('G', 'D', 'E', 'F'));

   face_subset = hb_subset_test_create_subset (face_fil, input);

   hb_subset_test_check (face_fi, face_subset, HB_TAG ('g','l','y','f'));
   hb_subset_test_check (face_fi, face_subset, HB_TAG ('l','o','c', 'a'));
   check_maxp_num_glyphs(face_subset, 3, true);

   hb_face_destroy (face_subset);
   hb_face_destroy (face_fi);
   hb_face_destroy (face_fil);
 }

 static void
 test_subset_glyf_noop (void)
 {
   hb_face_t *face_abc = hb_test_open_font_file ("fonts/Roboto-Regular.abc.ttf");

   hb_set_t *codepoints = hb_set_create();
   hb_face_t *face_abc_subset;
   hb_set_add (codepoints, 97);
   hb_set_add (codepoints, 98);
   hb_set_add (codepoints, 99);
   face_abc_subset = hb_subset_test_create_subset (face_abc, hb_subset_test_create_input (codepoints));
   hb_set_destroy (codepoints);

   check_maxp_num_glyphs(face_abc_subset, 4, true);
   hb_subset_test_check (face_abc, face_abc_subset, HB_TAG ('l','o','c', 'a'));
   hb_subset_test_check (face_abc, face_abc_subset, HB_TAG ('g','l','y','f'));

   hb_face_destroy (face_abc_subset);
   hb_face_destroy (face_abc);
 }

 static void
 test_subset_glyf_strip_hints_simple (void)
 {
   hb_face_t *face_abc = hb_test_open_font_file ("fonts/Roboto-Regular.abc.ttf");
   hb_face_t *face_ac = hb_test_open_font_file ("fonts/Roboto-Regular.ac.nohints.ttf");

   hb_set_t *codepoints = hb_set_create();
   hb_subset_input_t *input;
   hb_face_t *face_abc_subset;
   hb_set_add (codepoints, 'a');
   hb_set_add (codepoints, 'c');
   input = hb_subset_test_create_input (codepoints);
   hb_subset_input_set_flags (input, HB_SUBSET_FLAGS_NO_HINTING);
   face_abc_subset = hb_subset_test_create_subset (face_abc, input);
   hb_set_destroy (codepoints);

   check_maxp_num_glyphs(face_abc_subset, 3, false);
   hb_subset_test_check (face_ac, face_abc_subset, HB_TAG ('l','o','c', 'a'));
   hb_subset_test_check (face_ac, face_abc_subset, HB_TAG ('g','l','y','f'));

   hb_face_destroy (face_abc_subset);
   hb_face_destroy (face_abc);
   hb_face_destroy (face_ac);
 }

 static void
 test_subset_glyf_strip_hints_composite (void)
 {
   hb_face_t *face_components = hb_test_open_font_file ("fonts/Roboto-Regular.components.ttf");
   hb_face_t *face_subset = hb_test_open_font_file ("fonts/Roboto-Regular.components.1fc.nohints.ttf");

   hb_set_t *codepoints = hb_set_create();
   hb_subset_input_t *input;
   hb_face_t *face_generated_subset;
   hb_set_add (codepoints, 0x1fc);
   input = hb_subset_test_create_input (codepoints);
   hb_subset_input_set_flags (input, HB_SUBSET_FLAGS_NO_HINTING);

   face_generated_subset = hb_subset_test_create_subset (face_components, input);
   hb_set_destroy (codepoints);

   check_maxp_num_glyphs(face_generated_subset, 4, false);
   hb_subset_test_check (face_subset, face_generated_subset, HB_TAG ('l','o','c', 'a'));
   hb_subset_test_check (face_subset, face_generated_subset, HB_TAG ('g','l','y','f'));

   hb_face_destroy (face_generated_subset);
   hb_face_destroy (face_subset);
   hb_face_destroy (face_components);
 }

 static void
 test_subset_glyf_strip_hints_invalid (void)
 {
   hb_face_t *face = hb_test_open_font_file ("../fuzzing/fonts/oom-ccc61c92d589f895174cdef6ff2e3b20e9999a1a");

   hb_set_t *codepoints = hb_set_create();
   const hb_codepoint_t text[] =
   {
     'A', 'B', 'C', 'D', 'E', 'X', 'Y', 'Z', '1', '2',
     '3', '@', '_', '%', '&', ')', '*', '$', '!'
   };
   unsigned int i;
   hb_subset_input_t *input;
   hb_face_t *face_subset;

   for (i = 0; i < sizeof (text) / sizeof (hb_codepoint_t); i++)
   {
     hb_set_add (codepoints, text[i]);
   }

   input = hb_subset_test_create_input (codepoints);
   hb_subset_input_set_flags (input, HB_SUBSET_FLAGS_NO_HINTING);
   hb_set_destroy (codepoints);

   face_subset = hb_subset_or_fail (face, input);
   g_assert (!face_subset);

   hb_subset_input_destroy (input);
   hb_face_destroy (face);
 }

 static void
 test_subset_glyf_retain_gids (void)
 {
   hb_face_t *face_abc = hb_test_open_font_file ("fonts/Roboto-Regular.abc.ttf");
   hb_face_t *face_ac = hb_test_open_font_file ("fonts/Roboto-Regular.ac.retaingids.ttf");

   hb_set_t *codepoints = hb_set_create();
   hb_face_t *face_abc_subset;
   hb_set_add (codepoints, 97);
   hb_set_add (codepoints, 99);

   hb_subset_input_t *input = hb_subset_test_create_input (codepoints);
   hb_subset_input_set_flags (input, HB_SUBSET_FLAGS_RETAIN_GIDS);
   face_abc_subset = hb_subset_test_create_subset (face_abc, input);
   hb_set_destroy (codepoints);

   check_maxp_num_glyphs(face_abc_subset, 4, true);
   hb_subset_test_check (face_ac, face_abc_subset, HB_TAG ('l','o','c', 'a'));
   hb_subset_test_check (face_ac, face_abc_subset, HB_TAG ('g','l','y','f'));

   hb_face_destroy (face_abc_subset);
   hb_face_destroy (face_abc);
   hb_face_destroy (face_ac);
 }

 static void
 test_subset_glyf_retain_gids_truncates (void)
 {
   hb_face_t *face_abc = hb_test_open_font_file ("fonts/Roboto-Regular.abc.ttf");
   hb_face_t *face_a = hb_test_open_font_file ("fonts/Roboto-Regular.a.retaingids.ttf");

   hb_set_t *codepoints = hb_set_create();
   hb_face_t *face_abc_subset;
   hb_set_add (codepoints, 97);

   hb_subset_input_t *input = hb_subset_test_create_input (codepoints);
   hb_subset_input_set_flags (input, HB_SUBSET_FLAGS_RETAIN_GIDS);
   face_abc_subset = hb_subset_test_create_subset (face_abc, input);
   hb_set_destroy (codepoints);

   check_maxp_num_glyphs(face_abc_subset, 2, true);
   hb_subset_test_check (face_a, face_abc_subset, HB_TAG ('l','o','c', 'a'));
   hb_subset_test_check (face_a, face_abc_subset, HB_TAG ('g','l','y','f'));

   hb_face_destroy (face_abc_subset);
   hb_face_destroy (face_abc);
   hb_face_destroy (face_a);
 }

 // TODO(grieger): test for long loca generation.

 int
 main (int argc, char **argv)
 {
   hb_test_init (&argc, &argv);

   hb_test_add (test_subset_glyf_noop);
   hb_test_add (test_subset_glyf);
   hb_test_add (test_subset_glyf_set_overlaps_flag);
   hb_test_add (test_subset_glyf_with_input_glyphs);
   hb_test_add (test_subset_glyf_strip_hints_simple);
   hb_test_add (test_subset_glyf_strip_hints_composite);
   hb_test_add (test_subset_glyf_strip_hints_invalid);
   hb_test_add (test_subset_glyf_with_components);
   hb_test_add (test_subset_glyf_with_gsub);
   hb_test_add (test_subset_glyf_without_gsub);
   hb_test_add (test_subset_glyf_retain_gids);
   hb_test_add (test_subset_glyf_retain_gids_truncates);

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

	#include "hb-test.h"
	#include "hb-subset-test.h"

	/* Unit tests for hb-subset-glyf.h */

	static void check_maxp_field (uint8_t *raw_maxp, unsigned int offset, uint16_t expected_value)
	{
	uint16_t actual_value = (raw_maxp[offset] << 8) + raw_maxp[offset + 1];
	g_assert_cmpuint(expected_value, ==, actual_value);
	}

	static void check_maxp_num_glyphs (hb_face_t *face, uint16_t expected_num_glyphs, bool hints)
	{
	hb_blob_t *maxp_blob = hb_face_reference_table (face, HB_TAG ('m','a','x', 'p'));

	unsigned int maxp_len;
	uint8_t raw_maxp = (uint8_t ) hb_blob_get_data(maxp_blob, &maxp_len);

	check_maxp_field (raw_maxp, 4, expected_num_glyphs); // numGlyphs
	if (!hints)
	{
	check_maxp_field (raw_maxp, 14, 1); // maxZones
	check_maxp_field (raw_maxp, 16, 0); // maxTwilightPoints
	check_maxp_field (raw_maxp, 18, 0); // maxStorage
	check_maxp_field (raw_maxp, 20, 0); // maxFunctionDefs
	check_maxp_field (raw_maxp, 22, 0); // maxInstructionDefs
	check_maxp_field (raw_maxp, 24, 0); // maxStackElements
	check_maxp_field (raw_maxp, 26, 0); // maxSizeOfInstructions
	}

	hb_blob_destroy (maxp_blob);
	}

	static void
	test_subset_glyf (void)
	{
	hb_face_t *face_abc = hb_test_open_font_file ("fonts/Roboto-Regular.abc.ttf");
	hb_face_t *face_ac = hb_test_open_font_file ("fonts/Roboto-Regular.ac.ttf");

	hb_set_t *codepoints = hb_set_create();
	hb_face_t *face_abc_subset;
	hb_set_add (codepoints, 97);
	hb_set_add (codepoints, 99);
	face_abc_subset = hb_subset_test_create_subset (face_abc, hb_subset_test_create_input (codepoints));
	hb_set_destroy (codepoints);

	check_maxp_num_glyphs(face_abc_subset, 3, true);
	hb_subset_test_check (face_ac, face_abc_subset, HB_TAG ('l','o','c', 'a'));
	hb_subset_test_check (face_ac, face_abc_subset, HB_TAG ('g','l','y','f'));

	hb_face_destroy (face_abc_subset);
	hb_face_destroy (face_abc);
	hb_face_destroy (face_ac);
	}

	static void
	test_subset_glyf_set_overlaps_flag (void)
	{
	hb_face_t *face_abcAE = hb_test_open_font_file ("fonts/Roboto-Regular.abcAE.ttf");
	hb_face_t *face_bAE = hb_test_open_font_file ("fonts/Roboto-Regular.bAE.ttf");

	hb_set_t *codepoints = hb_set_create();
	hb_face_t *face_abcAE_subset;
	hb_set_add (codepoints, 32);
	hb_set_add (codepoints, 98);
	hb_set_add (codepoints, 508);

	hb_subset_input_t* input = hb_subset_test_create_input (codepoints);
	hb_subset_input_set_flags (input, HB_SUBSET_FLAGS_SET_OVERLAPS_FLAG);
	face_abcAE_subset = hb_subset_test_create_subset (face_abcAE, input);
	hb_set_destroy (codepoints);

	hb_subset_test_check (face_bAE, face_abcAE_subset, HB_TAG ('l','o','c', 'a'));
	hb_subset_test_check (face_bAE, face_abcAE_subset, HB_TAG ('g','l','y','f'));

	hb_face_destroy (face_abcAE_subset);
	hb_face_destroy (face_abcAE);
	hb_face_destroy (face_bAE);
	}

	static void
	test_subset_glyf_with_input_glyphs (void)
	{
	hb_face_t *face_abc = hb_test_open_font_file ("fonts/Roboto-Regular.abc.ttf");
	hb_face_t *face_ac = hb_test_open_font_file ("fonts/Roboto-Regular.ac.ttf");

	hb_set_t *glyphs = hb_set_create();
	hb_face_t *face_abc_subset;
	hb_set_add (glyphs, 1);
	hb_set_add (glyphs, 3);
	face_abc_subset =
	hb_subset_test_create_subset (face_abc, hb_subset_test_create_input_from_glyphs (glyphs));
	hb_set_destroy (glyphs);

	hb_subset_test_check (face_ac, face_abc_subset, HB_TAG ('g','l','y','f'));
	hb_subset_test_check (face_ac, face_abc_subset, HB_TAG ('l','o','c', 'a'));
	check_maxp_num_glyphs(face_abc_subset, 3, true);

	hb_face_destroy (face_abc_subset);
	hb_face_destroy (face_abc);
	hb_face_destroy (face_ac);
	}

	static void
	test_subset_glyf_with_components (void)
	{
	hb_face_t *face_components = hb_test_open_font_file ("fonts/Roboto-Regular.components.ttf");
	hb_face_t *face_subset = hb_test_open_font_file ("fonts/Roboto-Regular.components.subset.ttf");

	hb_set_t *codepoints = hb_set_create();
	hb_face_t *face_generated_subset;
	hb_set_add (codepoints, 0x1fc);
	face_generated_subset = hb_subset_test_create_subset (face_components, hb_subset_test_create_input (codepoints));
	hb_set_destroy (codepoints);

	hb_subset_test_check (face_subset, face_generated_subset, HB_TAG ('g','l','y','f'));
	hb_subset_test_check (face_subset, face_generated_subset, HB_TAG ('l','o','c', 'a'));
	check_maxp_num_glyphs(face_generated_subset, 4, true);

	hb_face_destroy (face_generated_subset);
	hb_face_destroy (face_subset);
	hb_face_destroy (face_components);
	}

	static void
	test_subset_glyf_with_gsub (void)
	{
	hb_face_t *face_fil = hb_test_open_font_file ("fonts/Roboto-Regular.gsub.fil.ttf");
	hb_face_t *face_fi = hb_test_open_font_file ("fonts/Roboto-Regular.gsub.fi.ttf");
	hb_subset_input_t *input;
	hb_face_t *face_subset;

	hb_set_t *codepoints = hb_set_create();
	hb_set_add (codepoints, 102); // f
	hb_set_add (codepoints, 105); // i

	input = hb_subset_test_create_input (codepoints);
	hb_set_destroy (codepoints);
	hb_set_del (hb_subset_input_set (input, HB_SUBSET_SETS_DROP_TABLE_TAG), HB_TAG('G', 'S', 'U', 'B'));
	hb_set_del (hb_subset_input_set (input, HB_SUBSET_SETS_DROP_TABLE_TAG), HB_TAG('G', 'P', 'O', 'S'));
	hb_set_del (hb_subset_input_set (input, HB_SUBSET_SETS_DROP_TABLE_TAG), HB_TAG('G', 'D', 'E', 'F'));

	face_subset = hb_subset_test_create_subset (face_fil, input);

	hb_subset_test_check (face_fi, face_subset, HB_TAG ('g','l','y','f'));
	hb_subset_test_check (face_fi, face_subset, HB_TAG ('l','o','c', 'a'));
	check_maxp_num_glyphs(face_subset, 5, true);

	hb_face_destroy (face_subset);
	hb_face_destroy (face_fi);
	hb_face_destroy (face_fil);
	}

	static void
	test_subset_glyf_without_gsub (void)
	{
	hb_face_t *face_fil = hb_test_open_font_file ("fonts/Roboto-Regular.gsub.fil.ttf");
	hb_face_t *face_fi = hb_test_open_font_file ("fonts/Roboto-Regular.nogsub.fi.ttf");
	hb_subset_input_t *input;
	hb_face_t *face_subset;

	hb_set_t *codepoints = hb_set_create();
	hb_set_add (codepoints, 102); // f
	hb_set_add (codepoints, 105); // i

	input = hb_subset_test_create_input (codepoints);
	hb_set_destroy (codepoints);
	hb_set_add (hb_subset_input_set (input, HB_SUBSET_SETS_DROP_TABLE_TAG), HB_TAG('G', 'S', 'U', 'B'));
	hb_set_add (hb_subset_input_set (input, HB_SUBSET_SETS_DROP_TABLE_TAG), HB_TAG('G', 'P', 'O', 'S'));
	hb_set_add (hb_subset_input_set (input, HB_SUBSET_SETS_DROP_TABLE_TAG), HB_TAG('G', 'D', 'E', 'F'));

	face_subset = hb_subset_test_create_subset (face_fil, input);

	hb_subset_test_check (face_fi, face_subset, HB_TAG ('g','l','y','f'));
	hb_subset_test_check (face_fi, face_subset, HB_TAG ('l','o','c', 'a'));
	check_maxp_num_glyphs(face_subset, 3, true);

	hb_face_destroy (face_subset);
	hb_face_destroy (face_fi);
	hb_face_destroy (face_fil);
	}

	static void
	test_subset_glyf_noop (void)
	{
	hb_face_t *face_abc = hb_test_open_font_file ("fonts/Roboto-Regular.abc.ttf");

	hb_set_t *codepoints = hb_set_create();
	hb_face_t *face_abc_subset;
	hb_set_add (codepoints, 97);
	hb_set_add (codepoints, 98);
	hb_set_add (codepoints, 99);
	face_abc_subset = hb_subset_test_create_subset (face_abc, hb_subset_test_create_input (codepoints));
	hb_set_destroy (codepoints);

	check_maxp_num_glyphs(face_abc_subset, 4, true);
	hb_subset_test_check (face_abc, face_abc_subset, HB_TAG ('l','o','c', 'a'));
	hb_subset_test_check (face_abc, face_abc_subset, HB_TAG ('g','l','y','f'));

	hb_face_destroy (face_abc_subset);
	hb_face_destroy (face_abc);
	}

	static void
	test_subset_glyf_strip_hints_simple (void)
	{
	hb_face_t *face_abc = hb_test_open_font_file ("fonts/Roboto-Regular.abc.ttf");
	hb_face_t *face_ac = hb_test_open_font_file ("fonts/Roboto-Regular.ac.nohints.ttf");

	hb_set_t *codepoints = hb_set_create();
	hb_subset_input_t *input;
	hb_face_t *face_abc_subset;
	hb_set_add (codepoints, 'a');
	hb_set_add (codepoints, 'c');
	input = hb_subset_test_create_input (codepoints);
	hb_subset_input_set_flags (input, HB_SUBSET_FLAGS_NO_HINTING);
	face_abc_subset = hb_subset_test_create_subset (face_abc, input);
	hb_set_destroy (codepoints);

	check_maxp_num_glyphs(face_abc_subset, 3, false);
	hb_subset_test_check (face_ac, face_abc_subset, HB_TAG ('l','o','c', 'a'));
	hb_subset_test_check (face_ac, face_abc_subset, HB_TAG ('g','l','y','f'));

	hb_face_destroy (face_abc_subset);
	hb_face_destroy (face_abc);
	hb_face_destroy (face_ac);
	}

	static void
	test_subset_glyf_strip_hints_composite (void)
	{
	hb_face_t *face_components = hb_test_open_font_file ("fonts/Roboto-Regular.components.ttf");
	hb_face_t *face_subset = hb_test_open_font_file ("fonts/Roboto-Regular.components.1fc.nohints.ttf");

	hb_set_t *codepoints = hb_set_create();
	hb_subset_input_t *input;
	hb_face_t *face_generated_subset;
	hb_set_add (codepoints, 0x1fc);
	input = hb_subset_test_create_input (codepoints);
	hb_subset_input_set_flags (input, HB_SUBSET_FLAGS_NO_HINTING);

	face_generated_subset = hb_subset_test_create_subset (face_components, input);
	hb_set_destroy (codepoints);

	check_maxp_num_glyphs(face_generated_subset, 4, false);
	hb_subset_test_check (face_subset, face_generated_subset, HB_TAG ('l','o','c', 'a'));
	hb_subset_test_check (face_subset, face_generated_subset, HB_TAG ('g','l','y','f'));

	hb_face_destroy (face_generated_subset);
	hb_face_destroy (face_subset);
	hb_face_destroy (face_components);
	}

	static void
	test_subset_glyf_strip_hints_invalid (void)
	{
	hb_face_t *face = hb_test_open_font_file ("../fuzzing/fonts/oom-ccc61c92d589f895174cdef6ff2e3b20e9999a1a");

	hb_set_t *codepoints = hb_set_create();
	const hb_codepoint_t text[] =
	{
	'A', 'B', 'C', 'D', 'E', 'X', 'Y', 'Z', '1', '2',
	'3', '@', '_', '%', '&', ')', '*', '$', '!'
	};
	unsigned int i;
	hb_subset_input_t *input;
	hb_face_t *face_subset;

	for (i = 0; i < sizeof (text) / sizeof (hb_codepoint_t); i++)
	{
	hb_set_add (codepoints, text[i]);
	}

	input = hb_subset_test_create_input (codepoints);
	hb_subset_input_set_flags (input, HB_SUBSET_FLAGS_NO_HINTING);
	hb_set_destroy (codepoints);

	face_subset = hb_subset_or_fail (face, input);
	g_assert (!face_subset);

	hb_subset_input_destroy (input);
	hb_face_destroy (face);
	}

	static void
	test_subset_glyf_retain_gids (void)
	{
	hb_face_t *face_abc = hb_test_open_font_file ("fonts/Roboto-Regular.abc.ttf");
	hb_face_t *face_ac = hb_test_open_font_file ("fonts/Roboto-Regular.ac.retaingids.ttf");

	hb_set_t *codepoints = hb_set_create();
	hb_face_t *face_abc_subset;
	hb_set_add (codepoints, 97);
	hb_set_add (codepoints, 99);

	hb_subset_input_t *input = hb_subset_test_create_input (codepoints);
	hb_subset_input_set_flags (input, HB_SUBSET_FLAGS_RETAIN_GIDS);
	face_abc_subset = hb_subset_test_create_subset (face_abc, input);
	hb_set_destroy (codepoints);

	check_maxp_num_glyphs(face_abc_subset, 4, true);
	hb_subset_test_check (face_ac, face_abc_subset, HB_TAG ('l','o','c', 'a'));
	hb_subset_test_check (face_ac, face_abc_subset, HB_TAG ('g','l','y','f'));

	hb_face_destroy (face_abc_subset);
	hb_face_destroy (face_abc);
	hb_face_destroy (face_ac);
	}

	static void
	test_subset_glyf_retain_gids_truncates (void)
	{
	hb_face_t *face_abc = hb_test_open_font_file ("fonts/Roboto-Regular.abc.ttf");
	hb_face_t *face_a = hb_test_open_font_file ("fonts/Roboto-Regular.a.retaingids.ttf");

	hb_set_t *codepoints = hb_set_create();
	hb_face_t *face_abc_subset;
	hb_set_add (codepoints, 97);

	hb_subset_input_t *input = hb_subset_test_create_input (codepoints);
	hb_subset_input_set_flags (input, HB_SUBSET_FLAGS_RETAIN_GIDS);
	face_abc_subset = hb_subset_test_create_subset (face_abc, input);
	hb_set_destroy (codepoints);

	check_maxp_num_glyphs(face_abc_subset, 2, true);
	hb_subset_test_check (face_a, face_abc_subset, HB_TAG ('l','o','c', 'a'));
	hb_subset_test_check (face_a, face_abc_subset, HB_TAG ('g','l','y','f'));

	hb_face_destroy (face_abc_subset);
	hb_face_destroy (face_abc);
	hb_face_destroy (face_a);
	}

	// TODO(grieger): test for long loca generation.

	int
	main (int argc, char **argv)
	{
	hb_test_init (&argc, &argv);

	hb_test_add (test_subset_glyf_noop);
	hb_test_add (test_subset_glyf);
	hb_test_add (test_subset_glyf_set_overlaps_flag);
	hb_test_add (test_subset_glyf_with_input_glyphs);
	hb_test_add (test_subset_glyf_strip_hints_simple);
	hb_test_add (test_subset_glyf_strip_hints_composite);
	hb_test_add (test_subset_glyf_strip_hints_invalid);
	hb_test_add (test_subset_glyf_with_components);
	hb_test_add (test_subset_glyf_with_gsub);
	hb_test_add (test_subset_glyf_without_gsub);
	hb_test_add (test_subset_glyf_retain_gids);
	hb_test_add (test_subset_glyf_retain_gids_truncates);

	return hb_test_run();
	}