Add a basic test for glyf subsetting.

test/api/Makefile.am

@@ -30,11 +30,13 @@ TEST_PROGS = \
 	test-set \
 	test-shape \
 	test-subset \
+	test-subset-glyf \
 	test-unicode \
 	test-version \
 	$(NULL)
 
 test_subset_LDADD = $(LDADD) $(top_builddir)/src/libharfbuzz-subset.la
+test_subset_glyf_LDADD = $(LDADD) $(top_builddir)/src/libharfbuzz-subset.la
 
 test_unicode_CPPFLAGS = \
 	$(AM_CPPFLAGS) \
@@ -60,6 +62,8 @@ TEST_PROGS += \
 test_ot_math_LDADD = $(LDADD) $(FREETYPE_LIBS)
 test_ot_math_CPPFLAGS = $(AM_CPPFLAGS) $(FREETYPE_CFLAGS)
 EXTRA_DIST += \
+	fonts/Roboto-Regular.abc.ttf \
+	fonts/Roboto-Regular.ac.ttf \
 	fonts/MathTestFontEmpty.otf \
 	fonts/MathTestFontFull.otf \
 	fonts/MathTestFontNone.otf \

test/api/test-subset-glyf.c

@@ -0,0 +1,134 @@
+/*
+ * 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 <stdbool.h>
+
+#include "hb-test.h"
+
+#ifndef g_assert_cmpmem
+#define g_assert_cmpmem(m1, l1, m2, l2) g_assert_true (l1 == l2 && memcmp (m1, m2, l1) == 0)
+#endif
+
+static char *
+read_file (const char *path,
+           size_t     *length)
+{
+  FILE *fp = fopen (path, "rb");
+
+  size_t file_length = 0;
+  char *buffer = NULL;
+  if (fp && fseek (fp, 0, SEEK_END) == 0) {
+    file_length = ftell(fp);
+    rewind (fp);
+  }
+
+  bool success = false;
+  if (file_length > 0) {
+    buffer = (char *) calloc (file_length + 1, sizeof(char));
+    if (fread (buffer, 1, file_length, fp) == file_length) {
+      *length = file_length;
+    } else {
+      free (buffer);
+      buffer = NULL;
+    }
+  }
+
+  if (fp)
+    fclose(fp);
+
+  return buffer;
+}
+
+static hb_face_t *
+open_font (const char *font_path)
+{
+  gchar *path = g_test_build_filename(G_TEST_DIST, font_path, NULL);
+
+  size_t length;
+  char *font_data = read_file(path, &length);
+
+  if (font_data != NULL) {
+    hb_blob_t *blob = hb_blob_create (font_data,
+                                      length,
+                                      HB_MEMORY_MODE_READONLY,
+                                      font_data,
+                                      free);
+    hb_face_t *face = hb_face_create (blob, 0);
+    hb_blob_destroy (blob);
+    return face;
+  }
+
+  return NULL;
+}
+
+
+/* Unit tests for hb-subset-glyf.h */
+
+static void
+test_subset_glyf (void)
+{
+  hb_face_t *face_abc = open_font("fonts/Roboto-Regular.abc.ttf");
+  hb_face_t *face_ac = open_font("fonts/Roboto-Regular.ac.ttf");
+
+  g_assert (face_abc);
+  g_assert (face_ac);
+
+  hb_set_t *codepoints = hb_set_create();
+  hb_set_add (codepoints, 97);
+  hb_set_add (codepoints, 99);
+
+  hb_subset_profile_t *profile = hb_subset_profile_create();
+  hb_subset_input_t *input = hb_subset_input_create (codepoints);
+
+  hb_face_t *face_abc_subset = hb_subset (face_abc, profile, input);
+  g_assert (face_abc_subset);
+
+  hb_blob_t *glyf_expected_blob = hb_face_reference_table (face_ac, HB_TAG('g','l','y','f'));
+  hb_blob_t *glyf_actual_blob = hb_face_reference_table (face_abc_subset, HB_TAG('g','l','y','f'));
+
+  int expected_length, actual_length;
+  g_assert_cmpmem(hb_blob_get_data (glyf_expected_blob, &expected_length), expected_length,
+                  hb_blob_get_data (glyf_actual_blob, &actual_length), actual_length);
+
+  hb_blob_destroy (glyf_actual_blob);
+  hb_blob_destroy (glyf_expected_blob);
+  hb_subset_input_destroy (input);
+  hb_subset_profile_destroy (profile);
+  hb_set_destroy (codepoints);
+  hb_face_destroy (face_abc_subset);
+  hb_face_destroy (face_abc);
+  hb_face_destroy (face_ac);
+}
+
+int
+main (int argc, char **argv)
+{
+  hb_test_init (&argc, &argv);
+
+  hb_test_add (test_subset_glyf);
+
+  return hb_test_run();
+}