Support Non-Standard Fonts in PDF SDK

To support non-standard fonts on Foxit PDF SDK, follow the steps outlined below:

Use the FSCRT_Library_AddFontFile or use FSCRT_Library_SetFontMapperHandler.
Create the callback to handle the non-standard font.
```
static FSCRT_FONTMAPPERHANDLER ExternalFontMapper; 

static FS_RESULT MapExternalFont(FS_LPVOID clientData, FS_LPCSTR fontName, FS_DWORD fontStyles, FS_INT32 weight, FS_INT32 charset, FSCRT_FILE *fontFile, FS_INT32 *faceIndex){

        if(fontName=="randomFontName") {

            //set fontFile to use the non-Standard font file

        }

         return 0;

}
```
Note: MapExternalFont is a callback function that will provide the font details. With the details, user can set the best matching font.

Note: Here is how to set the font file, call FSCRT_File_Create with FSCRT_File_Write, FSCRT_File_CreateCacheFile, FSCRT_File_CreateFromMemory, or FSCRT_File_CreateFromFileName to create the handle for FSCRT_FILE. Please see fs_base_r.h or fs_codec_r.h for details

Note: The return code is for error handling. Error code 0 means success.
Set the callback function to the Library FontMapper.
```
ExternalFontMapper.MapFont = MapExternalFont;

ExternalFontMapper.clientData = 0; 

FSCRT_Library_SetFontMapperHandler(&ExternalFontMapper);
```
Note: ClientData is your own data that you want to pass to MapExternalFont when it is triggered.

Note: This article refers to a deprecated version of a Foxit Product. If you are still using Foxit PDF SDK 5.3 or older, please refer to your download package documents for Developer Guide and API Reference.

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