Merge pull request #845 from googlefonts/drophints

[subset] drop hints from composites

src/hb-ot-glyf-table.hh

@@ -402,17 +402,17 @@ struct glyf
       int16_t num_contours = (int16_t) glyph_header.numberOfContours;
       if (num_contours < 0)
       {
-        CompositeGlyphHeader::Iterator *composite_it;
+        CompositeGlyphHeader::Iterator composite_it;
         if (unlikely (!CompositeGlyphHeader::get_iterator (
             (const char*) this->glyf_table + start_offset,
-             end_offset - start_offset, composite_it))) return false;
+             end_offset - start_offset, &composite_it))) return false;
         const CompositeGlyphHeader *last;
         do {
-          last = composite_it->current;
-        } while (composite_it->move_to_next());
+          last = composite_it.current;
+        } while (composite_it.move_to_next());
 
         if ( (uint16_t) last->flags & CompositeGlyphHeader::WE_HAVE_INSTRUCTIONS)
-          *instruction_start = start_offset + ((char *) last - (char *) glyf_table->dataX) + last->get_size();
+          *instruction_start = ((char *) last - (char *) glyf_table->dataX) + last->get_size();
         else
           *instruction_start = end_offset;
         *instruction_end = end_offset;

src/hb-subset-glyf.cc

@@ -136,6 +136,20 @@ _update_components (hb_subset_plan_t * plan,
   }
 }
 
+static bool _remove_composite_instruction_flag(char *glyf_prime, unsigned int length)
+{
+  /* remove WE_HAVE_INSTRUCTIONS from flags in dest */
+  OT::glyf::CompositeGlyphHeader::Iterator composite_it;
+  if (unlikely (!OT::glyf::CompositeGlyphHeader::get_iterator (glyf_prime, length, &composite_it))) return false;
+  const OT::glyf::CompositeGlyphHeader *glyph;
+  do {
+    glyph = composite_it.current;
+    OT::HBUINT16 *flags = const_cast<OT::HBUINT16 *> (&glyph->flags);
+    flags->set ( (uint16_t) *flags & ~OT::glyf::CompositeGlyphHeader::WE_HAVE_INSTRUCTIONS);
+  } while (composite_it.move_to_next());
+  return true;
+}
+
 static bool
 _write_glyf_and_loca_prime (hb_subset_plan_t              *plan,
 			    const OT::glyf::accelerator_t &glyf,
@@ -178,9 +192,11 @@ _write_glyf_and_loca_prime (hb_subset_plan_t              *plan,
     {
       memcpy (glyf_prime_data_next, glyf_data + start_offset, instruction_start - start_offset);
       memcpy (glyf_prime_data_next + instruction_start - start_offset, glyf_data + instruction_end, end_offset - instruction_end);
-      /* if the instructions end at the end this was a composite glyph */
+      /* if the instructions end at the end this was a composite glyph, else simple */
       if (instruction_end == end_offset)
-        ; // TODO(rsheeter) remove WE_HAVE_INSTRUCTIONS from last flags
+      {
+        if (unlikely (!_remove_composite_instruction_flag (glyf_prime_data_next, length))) return false;
+      }
       else
         /* zero instruction length, which is just before instruction_start */
         memset (glyf_prime_data_next + instruction_start - start_offset - 2, 0, 2);

test/api/test-subset-glyf.c

@@ -121,7 +121,7 @@ test_subset_glyf_noop (void)
 }
 
 static void
-test_subset_glyf_strip_hints (void)
+test_subset_glyf_strip_hints_simple (void)
 {
   hb_face_t *face_abc = hb_subset_test_open_font ("fonts/Roboto-Regular.abc.ttf");
   hb_face_t *face_ac = hb_subset_test_open_font ("fonts/Roboto-Regular.ac.nohints.ttf");
@@ -143,7 +143,28 @@ test_subset_glyf_strip_hints (void)
   hb_face_destroy (face_ac);
 }
 
-// TODO(rsheeter): test strip hints from composite
+static void
+test_subset_glyf_strip_hints_composite (void)
+{
+  hb_face_t *face_components = hb_subset_test_open_font ("fonts/Roboto-Regular.components.ttf");
+  hb_face_t *face_subset = hb_subset_test_open_font ("fonts/Roboto-Regular.components.1fc.nohints.ttf");
+
+  hb_set_t *codepoints = hb_set_create();
+  hb_set_add (codepoints, 0x1fc);
+  hb_subset_input_t *input = hb_subset_test_create_input (codepoints);
+  *hb_subset_input_drop_hints(input) = true;
+
+  hb_face_t *face_generated_subset = hb_subset_test_create_subset (face_components, input);
+  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, false);
+
+  hb_face_destroy (face_generated_subset);
+  hb_face_destroy (face_subset);
+  hb_face_destroy (face_components);
+}
 
 // TODO(grieger): test for long loca generation.
 
@@ -154,7 +175,8 @@ main (int argc, char **argv)
 
   hb_test_add (test_subset_glyf_noop);
   hb_test_add (test_subset_glyf);
-  hb_test_add (test_subset_glyf_strip_hints);
+  hb_test_add (test_subset_glyf_strip_hints_simple);
+  hb_test_add (test_subset_glyf_strip_hints_composite);
   hb_test_add (test_subset_glyf_with_components);
 
   return hb_test_run();

test/subset/data/Makefile.am

@@ -8,6 +8,7 @@ SUBDIRS =
 EXTRA_DIST = \
 	$(TESTS) \
 	expected/basics \
+	expected/full-font \
 	fonts \
 	profiles \
 	$(NULL)

test/subset/data/Makefile.sources

@@ -1,5 +1,6 @@
 TESTS = \
 	tests/basics.tests \
+	tests/full-font.tests \
 	$(NULL)
 
 XFAIL_TESTS = \

test/subset/data/profiles/drop-hints.txt

@@ -0,0 +1 @@
+--no-hinting

test/subset/data/tests/basics.tests

@@ -3,6 +3,11 @@ Roboto-Regular.abc.ttf
 
 PROFILES:
 default.txt
+drop-hints.txt
 
 SUBSETS:
+abc
 b
+c
+ac
+a

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

@@ -0,0 +1,11 @@
+FONTS:
+Roboto-Regular.ttf
+
+PROFILES:
+default.txt
+drop-hints.txt
+
+SUBSETS:
+abc
+Ǽ!A bc
+

test/subset/generate-expected-outputs.py

@@ -15,12 +15,17 @@ def usage():
 	print "Usage: generate-expected-outputs.py <test suite file> ..."
 
 
-def generate_expected_output(input_file, unicodes, output_path):
-	check_call(["fonttools", "subset",
-							input_file,
+def generate_expected_output(input_file, unicodes, profile_flags, output_path):
+	args = ["fonttools", "subset", input_file]
+	args.extend(profile_flags)
+	args.extend(["--notdef-outline",
+		     "--name-IDs=*",
+		     "--name-languages=*",
+		     "--name-legacy",
 		     "--drop-tables+=DSIG,GPOS,GSUB,GDEF",
 		     "--unicodes=%s" % unicodes,
 		     "--output-file=%s" % output_path])
+	check_call(args)
 
 
 args = sys.argv[1:]
@@ -37,6 +42,6 @@ for path in args:
 			unicodes = test.unicodes()
 			font_name = test.get_font_name()
 			print "Creating subset %s/%s" % (output_directory, font_name)
-			generate_expected_output(test.font_path, unicodes,
+			generate_expected_output(test.font_path, unicodes, test.get_profile_flags(),
 						 os.path.join(output_directory,
 							      font_name))

test/subset/run-tests.py

@@ -44,6 +44,7 @@ def run_test(test):
 		    "--font-file=" + test.font_path,
 		    "--output-file=" + out_file,
 		    "--unicodes=%s" % test.unicodes()]
+	cli_args.extend (test.get_profile_flags())
 	print (' '.join(cli_args))
 	_, return_code = cmd(cli_args)
 

test/subset/subset_test_suite.py

@@ -1,5 +1,6 @@
 #!/usr/bin/env python
 
+import io
 import os
 
 # A single test in a subset test suite. Identifies a font
@@ -13,6 +14,10 @@ class Test:
 	def unicodes(self):
 		return ",".join("%X" % ord(c) for (i, c) in enumerate(self.subset))
 
+	def get_profile_flags(self):
+		with io.open(self.profile_path, mode="r", encoding="utf-8") as f:
+		    return f.read().splitlines();
+
 	def get_font_name(self):
 		font_base_name = os.path.basename(self.font_path)
 		font_base_name_parts = os.path.splitext(font_base_name)