OTS: Add DoNotDropColorBitmapTables() API.

trunk/src/cmap.cc

 // Copyright (c) 2009 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "cmap.h"
 
 #include <algorithm>
 #include <set>
 #include <utility>
 #include <vector>
@@ skipping 830 matching lines @@
   const unsigned num_subtables = static_cast<unsigned>(have_034) +
                                  static_cast<unsigned>(have_0514) +
                                  static_cast<unsigned>(have_100) +
                                  static_cast<unsigned>(have_304) +
                                  static_cast<unsigned>(have_314) +
                                  static_cast<unsigned>(have_31012) +
                                  static_cast<unsigned>(have_31013);
   const off_t table_start = out->Tell();
 
   // Some fonts don't have 3-0-4 MS Symbol nor 3-1-4 Unicode BMP tables
-  // (e.g., old fonts for Mac). We don't support them.
+  // (e.g., old fonts for Mac). We don't support them except for color bitmap
+  // fonts.
   if (!have_304 && !have_314 && !have_034) {
-    return OTS_FAILURE();
+    if (!(file->cbdt && file->cblc)) {
+      return OTS_FAILURE();
+    }
   }
 
   if (!out->WriteU16(0) ||
       !out->WriteU16(num_subtables)) {
     return OTS_FAILURE();
   }
 
   const off_t record_offset = out->Tell();
   if (!out->Pad(num_subtables * 8)) {
     return OTS_FAILURE();
@@ skipping 203 matching lines @@
   out->RestoreChecksum(saved_checksum);
 
   return true;
 }
 
 void ots_cmap_free(OpenTypeFile *file) {
   delete file->cmap;
 }
 
 }  // namespace ots