Add skeleton of hb-subset-glyf, call if from hb_subset(...)

src/Makefile.sources

@@ -184,11 +184,13 @@ HB_ICU_headers = hb-icu.h
 # Sources for libharfbuzz-subset
 HB_SUBSET_sources = \
 	hb-subset.cc \
+	hb-subset-glyf.cc \
 	hb-subset-plan.cc \
 	$(NULL)
 
 HB_SUBSET_headers = \
 	hb-subset.h \
+	hb-subset-glyf.hh \
 	hb-subset-plan.hh \
 	hb-subset-private.hh \
 	$(NULL)

src/hb-subset-glyf.cc

+/*
+ * 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-subset-glyf.hh"
+
+/**
+ * hb_subset_glyf:
+ * Subsets the glyph table according to a provided plan.
+ *
+ * Return value: subsetted glyf table.
+ *
+ * Since: 1.7.5
+ **/
+bool
+hb_subset_glyf (hb_subset_plan_t *plan,
+                hb_blob_t *glyf,
+                hb_blob_t **glyf_prime /* OUT */)
+{
+  *glyf_prime = hb_blob_get_empty ();
+
+  return true;
+}

src/hb-subset-glyf.hh

+/*
+ * Copyright © 2018  Google
+ *
+ *  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
+ */
+
+#ifndef HB_SUBSET_GLYF_H
+#define HB_SUBSET_GLYF_H
+
+#include "hb-subset-plan.hh"
+
+bool
+hb_subset_glyf (hb_subset_plan_t *plan,
+                hb_blob_t        *glyf,
+                hb_blob_t       **glyf_prime /* OUT */);
+
+#endif /* HB_SUBSET_GLYF_HH */

src/hb-subset.cc

@@ -27,9 +27,12 @@
 
 #include "hb-object-private.hh"
 #include "hb-private.hh"
+#include "hb-subset-glyf.hh"
 #include "hb-subset-private.hh"
 #include "hb-subset-plan.hh"
 
+#include "hb-ot-glyf-table.hh"
+
 struct hb_subset_profile_t {
   hb_object_header_t header;
   ASSERT_POD ();
@@ -160,8 +163,19 @@ hb_subset (hb_subset_profile_t *profile,
   //   - copy the table into the output.
   // - Fix header + table directory.
 
-  *result = hb_face_reference_blob(face->face);
+  bool success = true;
 
+  hb_blob_t *glyf = hb_face_reference_table (face->face, HB_OT_TAG_glyf);
+  hb_blob_t *glyf_prime = nullptr;
+  if (hb_subset_glyf (plan, glyf, &glyf_prime)) {
+    // TODO: write new glyf to new face.
+  } else {
+    success = false;
+  }
+  hb_blob_destroy (glyf_prime);
+  hb_blob_destroy (glyf);
+
+  *result = hb_face_reference_blob(face->face);
   hb_subset_plan_destroy (plan);
-  return true;
+  return success;
 }