Re: [Devel] Windows API vs. FreeType API, how to make FT API faster

[jonathan . foster]

Hi,

> Anyone has a suggestion to make FT API faster?

Use the FreeType cache API.

Kind regards,

Jon Foster
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                                                   Subject:    [Devel] Windows 
API vs. FreeType API, how to make FT API faster         
                                                                                
                                                       
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               04/04/2003 05:06 am                                              
                                                       
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Hi, everyone

I'm writing a program based on Freetype API, and I do a benchmark comparing to 
Windows API GetGlyphOutline, it seems that FT API is a little slower than 
WinAPI, following is a snippet to show the problem. On my machine, ther running 
result is :

ft_duration = 700ms
win_duration = 211ms

Anyone has a suggestion to make FT API faster?

Assume there are global variant, here I skip the initialization of them
**************************START OF CODE SNIPPET*****************************
int             num_glyph;    /** glyph number, about 1600 here*/
OO_UInt    glyphs_index;    /** Glyph indices array, all of them is different */
FT_Face    face;

/**********************
 * bench_ft is for FreeType API
 */
void bench_ft()
{
     double start, end, ft_duration;
     int i;
     start = clock();
     for(i=0; i<num_glyphs; i++){
          FT_Load_Glyph(face, glyph_index[i], 
FT_LOAD_DEFAULT|FT_LOAD_NO_BITMAP);
          FT_Render_Glyph(face->glyph, ft_render_mode_mono);
     }
     end = clock();
     ft_duration = start-end;
}


/**********************
 * bench_win is for Windows API
 */
void bench_win()
{
     double start, end, win_duration;
     int i;
     GLYPHMETRICS  gm2;
     DWORD SizeBuffer;
     MAT2 mat2;
     start = clock();
     for(int i=0; i< num_glyphs; i++){
          unsigned char* lpBuffer = NULL;
          SizeBuffer = 
GetGlyphOutline(m_dc,glyphs_index[i],GGO_BITMAP|GGO_GLYPH_INDEX,
                       &gm2,0,NULL,&mat2);
          if(SizeBuffer == GDI_ERROR)
                return;

          unsigned char* lpBuffer = (unsigned char* )malloc(SizeBuffer);
          if(!lpBuffer)
                return;

          GetGlyphOutline(m_dc,glyphs_index[i],GGO_BITMAP|GGO_GLYPH_INDEX,
                      &gm2,SizeBuffer,lpBuffer,&mat2);
     }
     end = clock();
     win_duration = start-end;

 }
**************************END OF CODE SNIPPET*****************************

Happy
4/4/2003