Re: [ft] FT_New_Face

[Wenlin Institute]

On Sep 17, 2006, at 4:45 PM, Leonard Rosenthol wrote:
> 	I tend to use FT_New_Memory_Face() on Windows, having first found  
> the font data using native OS API calls and then loading the font  
> data into memory from there...

Thanks for that tip! That is one solution. Still, it seems preferable  
not to have to load the whole font into RAM. Some fonts are huge and  
memory may be limited; plus there's the problem with TTC fonts. Also,  
some Freetype users are likely to go on using FT_New_Face on Win32,  
and not realize that it may fail on non-ASCII filenames.

How about making FT_New_Face more usable on Win32, always supporting  
UTF-8 as well as the default encoding. This could go in ftstdlib.h:

#if defined(WIN32) && defined(UNICODE)
FILE * ft_fopen_win32(char *fname, char *mode);
#define ft_fopen ft_fopen_win32
#else
#define ft_fopen fopen
#endif

(Currently ftstdlib.h just has "#define ft_fopen fopen".)

The following could go wherever it belongs (maybe ftsystem.c?):

#if defined(WIN32) && defined(UNICODE)
FILE * ft_fopen_win32(char *fname, char *mode)
{
        // First try fopen, assuming nothing about character encodings.
        FILE *file = fopen(fname, mode);
        if (file == NULL) {
		/* fopen failed. Assume the filename is UTF-8, convert to UTF-16,  
and try _wfopen.
		 These max sizes are somewhat arbitrary; could use dynamic  
allocation instead,
                 and call MultiByteToWideChar(..., 0) to get size needed... */
                #define MAX_WIN32_FNAME 2048
                #define MAX_FOPEN_MODE 100
                TCHAR fnameW[MAX_WIN32_FNAME], modeW[MAX_FOPEN_MODE];
                if (MultiByteToWideChar(CP_UTF8, 0, fname, strlen(fname),
                                fnameW, MAX_WIN32_FNAME) == 0) {
                        return NULL;
                }
                if (MultiByteToWideChar(CP_UTF8, 0, mode, strlen(mode),
                                modeW, MAX_FOPEN_MODE) == 0) {
                        return NULL;
                }
                file = _wfopen(fnameW, modeW);
        }
        return file;
} /* ft_fopen_win32 */
#endif

I haven't been able to test this yet. Maybe someone will want to.

Tom

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