Linux: fix double italic on some fonts.

skia/ext/SkFontHost_fontconfig_direct.cpp

 /* libs/graphics/ports/SkFontHost_fontconfig_direct.cpp
 **
 ** Copyright 2009, Google Inc.
 **
 ** Licensed under the Apache License, Version 2.0 (the "License");
 ** you may not use this file except in compliance with the License.
 ** You may obtain a copy of the License at
 **
 **     http://www.apache.org/licenses/LICENSE-2.0
 **
@@ skipping 161 matching lines @@
     }
 
     int resulting_bold;
     if (FcPatternGetInteger(match, FC_WEIGHT, 0, &resulting_bold))
       resulting_bold = FC_WEIGHT_NORMAL;
 
     int resulting_italic;
     if (FcPatternGetInteger(match, FC_SLANT, 0, &resulting_italic))
       resulting_italic = FC_SLANT_ROMAN;
 
+    // If we ask for an italic font, fontconfig might take a roman font and set
+    // the undocumented property FC_MATRIX to a skew matrix. It'll then say
+    // that the font is italic or oblique. So, if we see a matrix, we don't
+    // believe that it's italic.
+    FcValue matrix;
+    const bool have_matrix = FcPatternGet(match, FC_MATRIX, 0, &matrix) == 0;
+
     if (is_bold)
       *is_bold = resulting_bold >= FC_WEIGHT_BOLD;
     if (is_italic)
-      *is_italic = resulting_italic == FC_SLANT_ITALIC;
+      *is_italic = resulting_italic > FC_SLANT_ROMAN && !have_matrix;
 
     if (result_family)
         *result_family = (char *) c_family;
 
     FcPatternDestroy(match);
 
     return true;
 }
 
 int FontConfigDirect::Open(unsigned fileid) {
     SkAutoMutexAcquire ac(mutex_);
     const std::map<unsigned, std::string>::const_iterator
         i = fileid_to_filename_.find(fileid);
     if (i == fileid_to_filename_.end())
         return -1;
 
     return open(i->second.c_str(), O_RDONLY);
 }