Add test-gsub-get-alternates.cc

src/Makefile.am

@@ -382,6 +382,7 @@ noinst_PROGRAMS = \
 	test-ot-name \
 	test-ot-glyphname \
 	test-gpos-size-params \
+	test-gsub-get-alternates \
 	test-gsub-would-substitute \
 	test-use-table \
 	$(NULL)
@@ -419,6 +420,10 @@ test_gpos_size_params_SOURCES = test-gpos-size-params.cc
 test_gpos_size_params_CPPFLAGS = $(HBCFLAGS)
 test_gpos_size_params_LDADD = libharfbuzz.la $(HBLIBS)
 
+test_gsub_get_alternates_SOURCES = test-gsub-get-alternates.cc
+test_gsub_get_alternates_CPPFLAGS = $(HBCFLAGS)
+test_gsub_get_alternates_LDADD = libharfbuzz.la $(HBLIBS)
+
 test_gsub_would_substitute_SOURCES = test-gsub-would-substitute.cc
 test_gsub_would_substitute_CPPFLAGS = $(HBCFLAGS) $(FREETYPE_CFLAGS)
 test_gsub_would_substitute_LDADD = libharfbuzz.la $(HBLIBS) $(FREETYPE_LIBS)

src/meson.build

@@ -668,6 +668,7 @@ if get_option('tests').enabled()
       'test-ot-name': 'test-ot-name.cc',
       'test-ot-glyphname': 'test-ot-glyphname.cc',
       'test-ot-gpos-size-params': 'test-gpos-size-params.cc',
+      'test-ot-gsub-get-alternates': 'test-gsub-get-alternates.cc',
       'test-ot-gsub-would-substitute': 'test-gsub-would-substitute.cc',
       'test-use-table': 'test-use-table.cc',
     }

src/test-gsub-get-alternates.cc

@@ -0,0 +1,86 @@
+/*
+ * Copyright © 2010,2011  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
+ */
+
+#include <hb.h>
+#include <hb-ot.h>
+
+#include <stdlib.h>
+#include <stdio.h>
+
+int
+main (int argc, char **argv)
+{
+  if (argc != 3) {
+    fprintf (stderr, "usage: %s font-file text\n", argv[0]);
+    exit (1);
+  }
+
+  /* Create the face */
+  hb_blob_t *blob = hb_blob_create_from_file_or_fail (argv[1]);
+  hb_face_t *face = hb_face_create (blob, 0 /* first face */);
+  hb_blob_destroy (blob);
+  blob = nullptr;
+
+  hb_font_t *font = hb_font_create (face);
+  hb_buffer_t *buffer = hb_buffer_create ();
+
+  hb_buffer_add_utf8 (buffer, argv[2], -1, 0, -1);
+  hb_buffer_guess_segment_properties (buffer);
+  hb_shape (font, buffer, NULL, 0);
+
+  hb_tag_t features[] = {HB_TAG('a','a','l','t'), HB_TAG_NONE};
+  hb_set_t *lookup_indexes = hb_set_create ();
+  hb_ot_layout_collect_lookups (face,
+				HB_OT_TAG_GSUB,
+				NULL, NULL,
+				features,
+				lookup_indexes);
+  printf ("lookups %u\n", hb_set_get_population (lookup_indexes));
+
+  unsigned count;
+  hb_glyph_info_t *info = hb_buffer_get_glyph_infos (buffer, &count);
+  for (unsigned i = 0; i < count; i++)
+  {
+    unsigned alt_count = 0;
+    for (unsigned lookup_index = HB_SET_VALUE_INVALID;
+	 hb_set_next (lookup_indexes, &lookup_index);)
+      if ((alt_count = hb_ot_layout_lookup_get_glyph_alternates (face,
+								 lookup_index,
+								 info[i].codepoint,
+								 0,
+								 NULL,
+								 NULL)))
+        break;
+    printf ("glyph %u alt count %u\n", info[i].codepoint, alt_count);
+  }
+
+  hb_set_destroy (lookup_indexes);
+  hb_buffer_destroy (buffer);
+  hb_font_destroy (font);
+  hb_face_destroy (face);
+
+  return 0;
+}