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

[Happy]

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