SkFontHost/FreeType/ToUnicode: add an assert

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 "SkAdvancedTypefaceMetrics.h"
 #include "SkBitmap.h"
 #include "SkCanvas.h"
@@ skipping 427 matching lines @@
     FT_Fixed advance = 0;
     if (FT_Get_Advances(face, gId, 1, FT_LOAD_NO_SCALE, &advance)) {
         return false;
     }
     SkASSERT(data);
     *data = advance;
     return true;
 }
 
 static void populate_glyph_to_unicode(FT_Face& face, SkTDArray<SkUnichar>* glyphToUnicode) {
-    glyphToUnicode->setCount(face->num_glyphs);
-    sk_bzero(glyphToUnicode->begin(), sizeof((*glyphToUnicode)[0]) * face->num_glyphs);
+    FT_Long numGlyphs = face->num_glyphs;
+    glyphToUnicode->setCount(SkToInt(numGlyphs));
+    sk_bzero(glyphToUnicode->begin(), sizeof((*glyphToUnicode)[0]) * numGlyphs);
 
     FT_UInt glyphIndex;
     SkUnichar charCode = FT_Get_First_Char(face, &glyphIndex);
     while (glyphIndex) {
+        SkASSERT(glyphIndex < SkToUInt(numGlyphs));
         (*glyphToUnicode)[glyphIndex] = charCode;
         charCode = FT_Get_Next_Char(face, charCode, &glyphIndex);
     }
 }
 
 SkAdvancedTypefaceMetrics* SkTypeface_FreeType::onGetAdvancedTypefaceMetrics(
         PerGlyphInfo perGlyphInfo,
         const uint32_t* glyphIDs,
         uint32_t glyphIDsCount) const {
 #if defined(SK_BUILD_FOR_MAC)
@@ skipping 1353 matching lines @@
                 SkDEBUGF(("Requested font axis not found: %s '%c%c%c%c'\n",
                           name.c_str(),
                           (skTag >> 24) & 0xFF,
                           (skTag >> 16) & 0xFF,
                           (skTag >>  8) & 0xFF,
                           (skTag)       & 0xFF));
             }
         }
     )
 }