Need to hold the FT library mutex to use the library.

src/ports/SkFontHost_FreeType.cpp

 
 /*
  * Copyright 2006 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkBitmap.h"
 #include "SkCanvas.h"
@@ skipping 943 matching lines @@
         FT_Set_Transform( fFace, &fMatrix22, NULL);
     }
     return err;
 }
 
 unsigned SkScalerContext_FreeType::generateGlyphCount() {
     return fFace->num_glyphs;
 }
 
 uint16_t SkScalerContext_FreeType::generateCharToGlyph(SkUnichar uni) {
+    SkAutoMutexAcquire  ac(gFTMutex);
     return SkToU16(FT_Get_Char_Index( fFace, uni ));
 }
 
 SkUnichar SkScalerContext_FreeType::generateGlyphToChar(uint16_t glyph) {
+    SkAutoMutexAcquire  ac(gFTMutex);
     // iterate through each cmap entry, looking for matching glyph indices
     FT_UInt glyphIndex;
     SkUnichar charCode = FT_Get_First_Char( fFace, &glyphIndex );
 
     while (glyphIndex != 0) {
         if (glyphIndex == glyph) {
             return charCode;
         }
         charCode = FT_Get_Next_Char( fFace, charCode, &glyphIndex );
     }
@@ skipping 545 matching lines @@
         *style = (SkTypeface::Style) tempStyle;
     }
     if (isFixedPitch) {
         *isFixedPitch = FT_IS_FIXED_WIDTH(face);
     }
 
     FT_Done_Face(face);
     FT_Done_FreeType(library);
     return true;
 }