add check for return value of FT_Glyph_To_Bitmap() #13
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FT_Glyph_To_Bitmap()can fail (for example, due to a failed memory allocation inft_new_glyph()that is called byFT_Glyph_To_Bitmap()) and would return a non-zero value to signal an error. This patch adds a check to the return value ofFT_Glyph_To_Bitmap()to check for non-zero return value and throw an exception in case of error.