Allow WOFF2Params to specify no transformations at all

src/woff2_compress.cc

@@ -39,8 +39,9 @@ int main(int argc, char **argv) {
   string output(output_size, 0);
   uint8_t* output_data = reinterpret_cast<uint8_t*>(&output[0]);
 
+  woff2::WOFF2Params params;
   if (!woff2::ConvertTTFToWOFF2(input_data, input.size(),
-                                output_data, &output_size)) {
+                                output_data, &output_size, params)) {
     fprintf(stderr, "Compression failed.\n");
     return 1;
   }

src/woff2_enc.cc

@@ -249,8 +249,20 @@ bool ConvertTTFToWOFF2(const uint8_t *data, size_t length,
     return FONT_COMPRESSION_FAILURE();
   }
 
-  if (!TransformFontCollection(&font_collection)) {
+  if (params.allow_transforms && !TransformFontCollection(&font_collection)) {
     return FONT_COMPRESSION_FAILURE();
+  } else {
+    // glyf/loca use 11 to flag "not transformed"
+    for (auto& font : font_collection.fonts) {
+      Font::Table* glyf_table = font.FindTable(kGlyfTableTag);
+      Font::Table* loca_table = font.FindTable(kLocaTableTag);
+      if (glyf_table) {
+        glyf_table->flag_byte |= 0xc0;
+      }
+      if (loca_table) {
+        loca_table->flag_byte |= 0xc0;
+      }
+    }
   }
 
   // Although the compressed size of each table in the final woff2 file won't

src/woff2_enc.h

@@ -27,10 +27,12 @@ using std::string;
 namespace woff2 {
 
 struct WOFF2Params {
-  WOFF2Params() : extended_metadata(""), brotli_quality(11) {}
+  WOFF2Params() : extended_metadata(""), brotli_quality(11),
+                  allow_transforms(true) {}
 
   string extended_metadata;
   int brotli_quality;
+  bool allow_transforms;
 };
 
 // Returns an upper bound on the size of the compressed file.