added desubroutinize & retain-gids full test cases with CFF fonts

and CFF retain-gids fixes

src/hb-subset-cff1.cc

@@ -476,24 +476,20 @@ struct cff_subset_plan {
     unsigned int glyph;
     for (glyph = 1; glyph < plan->num_output_glyphs (); glyph++)
     {
-      hb_codepoint_t  orig_glyph;
-      if (!plan->old_gid_for_new_gid (glyph, &orig_glyph))
+      hb_codepoint_t  old_glyph;
+      if (!plan->old_gid_for_new_gid (glyph, &old_glyph))
       {
-	/* pretend a missing glyph has the last code + 1
-	 * as an attempt to minimize the number of ranges */
-	code = last_code + 1;
+      	/* Retain the code for the old missing glyph ID */
+	old_glyph = glyph;
       }
-      else
+      code = acc.glyph_to_code (old_glyph);
+      if (code == CFF_UNDEF_CODE)
       {
-	code = acc.glyph_to_code (orig_glyph);
-	if (code == CFF_UNDEF_CODE)
-	{
-	  subset_enc_num_codes = glyph - 1;
-	  break;
-	}
+	subset_enc_num_codes = glyph - 1;
+	break;
       }
 
-      if (code != last_code + 1)
+      if ((last_code == CFF_UNDEF_CODE) || (code != last_code + 1))
       {
 	code_pair_t pair = { code, glyph };
 	subset_enc_code_ranges.push (pair);
@@ -502,7 +498,7 @@ struct cff_subset_plan {
 
       if (encoding != &Null(Encoding))
       {
-	hb_codepoint_t  sid = acc.glyph_to_sid (orig_glyph);
+	hb_codepoint_t  sid = acc.glyph_to_sid (old_glyph);
 	encoding->get_supplement_codes (sid, supp_codes);
 	for (unsigned int i = 0; i < supp_codes.length; i++)
 	{
@@ -540,22 +536,18 @@ struct cff_subset_plan {
     unsigned int glyph;
     for (glyph = 1; glyph < plan->num_output_glyphs (); glyph++)
     {
-      hb_codepoint_t  orig_glyph;
-      if (!plan->old_gid_for_new_gid (glyph, &orig_glyph))
+      hb_codepoint_t  old_glyph;
+      if (!plan->old_gid_for_new_gid (glyph, &old_glyph))
       {
-	/* pretend a missing glyph has the last sid + 1
-	 * as an attempt to minimize the number of ranges */
-	sid = last_sid + 1;
+      	/* Retain the SID for the old missing glyph ID */
+	old_glyph = glyph;
       }
-      else
-      {
-      	sid = acc.glyph_to_sid (orig_glyph);
+      sid = acc.glyph_to_sid (old_glyph);
 
-      	if (!acc.is_CID ())
-	  sid = sidmap.add (sid);
-      }
+      if (!acc.is_CID ())
+	sid = sidmap.add (sid);
 
-      if (sid != last_sid + 1)
+      if ((last_sid == CFF_UNDEF_CODE) || (sid != last_sid + 1))
       {
 	code_pair_t pair = { sid, glyph };
 	subset_charset_ranges.push (pair);

test/subset/data/profiles/desubroutinize-retain-gids.txt

+--desubroutinize
+--retain-gids

test/subset/data/profiles/drop-hints-desubroutinize-retain-gids.txt

+--no-hinting
+--desubroutinize
+--retain-gids

test/subset/data/tests/full-font.tests

@@ -5,6 +5,12 @@ SourceSansPro-Regular.otf
 PROFILES:
 default.txt
 drop-hints.txt
+drop-hints-retain-gids.txt
+retain-gids.txt
+desubroutinize.txt
+desubroutinize-retain-gids.txt
+drop-hints-desubroutinize.txt
+drop-hints-desubroutinize-retain-gids.txt
 
 SUBSETS:
 abc

test/subset/data/tests/japanese.tests

@@ -5,6 +5,12 @@ SourceHanSans-Regular.otf
 PROFILES:
 default.txt
 drop-hints.txt
+drop-hints-retain-gids.txt
+retain-gids.txt
+desubroutinize.txt
+desubroutinize-retain-gids.txt
+drop-hints-desubroutinize.txt
+drop-hints-desubroutinize-retain-gids.txt
 
 SUBSETS:
 明

test/subset/subset_test_suite.py

@@ -34,7 +34,7 @@ class Test:
 		return font_base_name_parts[1]
 
 	def applicable(self):
-		return self.profile_path.find("desubroutinize") < 0 or self.get_font_extension() == "otf"
+		return self.profile_path.find("desubroutinize") < 0 and self.profile_path.find("retain-gids") < 0 or self.get_font_extension() == ".otf"
 
 # A group of tests to perform on the subsetter. Each test
 # Identifies a font a subsetting profile, and a subset to be cut.