fttimer.c

freetype库的应用demo,里面包含freetype的很多实例

/****************************************************************************/
/*                                                                          */
/*  The FreeType project - a Free and Portable Quality TrueType Renderer.   */
/*                                                                          */
/*  Copyright 1996-1998, 2003 by                                            */
/*  D. Turner, R.Wilhelm, and W. Lemberg                                    */
/*                                                                          */
/*  fttimer: A simple performance benchmark.  Now with graylevel rendering  */
/*           with the '-g' option.                                          */
/*                                                                          */
/*           Be aware that the timer program benchmarks different things    */
/*           in each release of the FreeType library.  Thus, performance    */
/*           should only be compared between similar release numbers.       */
/*                                                                          */
/*                                                                          */
/*  NOTE: This is just a test program that is used to show off and          */
/*        debug the current engine.  In no way does it shows the final      */
/*        high-level interface that client applications will use.           */
/*                                                                          */
/****************************************************************************/

#include <ft2build.h>
#include FT_FREETYPE_H
#include FT_GLYPH_H

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>    /* for clock() */

  /* SunOS 4.1.* does not define CLOCKS_PER_SEC, so include <sys/param.h> */
  /* to get the HZ macro which is the equivalent.                         */
#if defined( __sun__ ) && !defined( SVR4 ) && !defined( __SVR4 )
#include <sys/param.h>
#define CLOCKS_PER_SEC HZ
#endif

#define CHARSIZE    400   /* character point size */
#define MAX_GLYPHS  512   /* Maximum number of glyphs rendered at one time */

  char  Header[128];

  FT_Error    error;
  FT_Library  library;

  FT_Face     face;

  int         num_glyphs;
  FT_Glyph    glyphs[MAX_GLYPHS];
  
  int         tab_glyphs;
  int         cur_glyph;

  int         pixel_size   = CHARSIZE;
  int         repeat_count = 1;

  int         Fail;
  int         Num;

  short       antialias = 1; /* smooth fonts with gray levels  */
  short       force_low;


  static void
  Panic( const char*  message )
  {
    fprintf( stderr, "%s\n", message );
    exit( 1 );
  }


  /*******************************************************************/
  /*                                                                 */
  /*  Get_Time:                                                      */
  /*                                                                 */
  /*    Returns the current time in milliseconds.                    */
  /*                                                                 */
  /*******************************************************************/

  static long
  Get_Time( void )
  {
    return clock() * 10000 / CLOCKS_PER_SEC;
  }


  /*******************************************************************/
  /*                                                                 */
  /*  LoadChar:                                                      */
  /*                                                                 */
  /*    Loads a glyph into memory.                                   */
  /*                                                                 */
  /*******************************************************************/

  static FT_Error
  LoadChar( int  idx )
  {
    FT_Glyph  glyph;
    

    /* load the glyph in the glyph slot */
    error = FT_Load_Glyph( face, idx, FT_LOAD_DEFAULT ) ||
            FT_Get_Glyph ( face->glyph, &glyph );
    if ( !error )
      glyphs[cur_glyph++] = glyph;

    return error;
  }


  /*******************************************************************/
  /*                                                                 */
  /*  ConvertRaster:                                                 */
  /*                                                                 */
  /*    Performs scan conversion.                                    */
  /*                                                                 */
  /*******************************************************************/

  static FT_Error
  ConvertRaster( int  idx )
  {
    FT_Glyph  bitmap;

    
    bitmap = glyphs[idx];
    if ( bitmap->format == FT_GLYPH_FORMAT_BITMAP )
      error = 0;  /* we already have a (embedded) bitmap */
    else
    {
      error = FT_Glyph_To_Bitmap( &bitmap,
                                  antialias ? FT_RENDER_MODE_NORMAL
                                            : FT_RENDER_MODE_MONO,
                                  0,
                                  0 );
      if ( !error )
        FT_Done_Glyph( bitmap );
    }
      
    return error;
  }


  static void
  Usage( void )
  {
    fprintf( stderr, "fttimer: simple performance timer -- part of the FreeType project\n" );
    fprintf( stderr, "-----------------------------------------------------------------\n\n" );
    fprintf( stderr, "Usage: fttimer [options] fontname[.ttf|.ttc]\n\n" );
    fprintf( stderr, "options:\n");
    fprintf( stderr, "   -r : repeat count to be used (default is 1)\n" );
    fprintf( stderr, "   -s : character pixel size (default is 600)\n" );
    fprintf( stderr, "   -m : render monochrome glyphs (default is anti-aliased)\n" );
    fprintf( stderr, "   -a : use smooth anti-aliaser\n" );
    fprintf( stderr, "   -l : force low quality even at small sizes\n" );

    exit( 1 );
  }


  int
  main( int     argc,
        char**  argv )
  {
    int    i, total, base, rendered_glyphs;
    char   filename[128 + 4];
    char   alt_filename[128 + 4];
    char*  execname;

    long   t, t0, tz0;


    execname = argv[0];

    antialias = 1;
    force_low = 0;

    while ( argc > 1 && argv[1][0] == '-' )
    {
      switch ( argv[1][1] )
      {
      case 'm':
        antialias = 0;
        break;

      case 'l':
        force_low = 1;
        break;

      case 's':
        argc--;
        argv++;
        if ( argc < 2 ||
             sscanf( argv[1], "%d", &pixel_size ) != 1 )
          Usage();
        break;

      case 'r':
        argc--;
        argv++;
        if ( argc < 2 ||
             sscanf( argv[1], "%d", &repeat_count ) != 1 )
          Usage();
        if ( repeat_count < 1 )
          repeat_count = 1;
        break;

      default:
        fprintf( stderr, "Unknown argument `%s'\n", argv[1] );
        Usage();
        break;
      }

      argc--;
      argv++;
    }

    if ( argc != 2 )
      Usage();

    i = strlen( argv[1] );
    while ( i > 0 && argv[1][i] != '\\' )
    {
      if ( argv[1][i] == '.' )
        i = 0;
      i--;
    }

    filename[128]     = '\0';
    alt_filename[128] = '\0';

    strncpy( filename, argv[1], 128 );
    strncpy( alt_filename, argv[1], 128 );

    if ( i >= 0 )
    {
      strncpy( filename + strlen( filename ), ".ttf", 4 );
      strncpy( alt_filename + strlen( alt_filename ), ".ttc", 4 );
    }

    /* Initialize engine */

    if ( ( error = FT_Init_FreeType( &library ) ) != 0 )
      Panic( "Error while initializing engine" );

    /* Load face */

    error = FT_New_Face( library, filename, 0, &face );
    if ( error == FT_Err_Cannot_Open_Stream )
      Panic( "Could not find/open font resource" );
    else if ( error )
      Panic( "Error while opening font resource" );

    /* get face properties and allocate preload arrays */

    num_glyphs = face->num_glyphs;

    tab_glyphs = MAX_GLYPHS;
    if ( tab_glyphs > num_glyphs )
      tab_glyphs = num_glyphs;

    /* create size */

    error = FT_Set_Pixel_Sizes( face, pixel_size, pixel_size );
    if ( error )
      Panic( "Could not reset instance" );

    Num  = 0;
    Fail = 0;

    total = num_glyphs;
    base  = 0;

    rendered_glyphs = 0;

    t0 = 0;  /* Initial time */

    tz0 = Get_Time();

    while ( total > 0 )
    {
      int  repeat;


      /* First, preload 'tab_glyphs' in memory */
      cur_glyph = 0;

      printf( "loading %d glyphs", tab_glyphs );

      for ( Num = 0; Num < tab_glyphs; Num++ )
      {
        error = LoadChar( base + Num );
        if ( error )
          Fail++;

        total--;
      }

      base += tab_glyphs;

      if ( tab_glyphs > total )
        tab_glyphs = total;

      printf( ", rendering... " );

      /* Now, render the loaded glyphs */

      t = Get_Time();

      for ( repeat = 0; repeat < repeat_count; repeat++ )
      {
        for ( Num = 0; Num < cur_glyph; Num++ )
        {
          if ( ( error = ConvertRaster( Num ) ) != 0 )
            Fail++;
          else
            rendered_glyphs++;
        }
      }

      t = Get_Time() - t;
      if ( t < 0 )
        t += 1000 * 60 * 60;

      printf( " = %f s\n", (double)t / 10000 );
      t0 += t;

      /* Now free all loaded outlines */
      for ( Num = 0; Num < cur_glyph; Num++ )
        FT_Done_Glyph( glyphs[Num] );
    }

    tz0 = Get_Time() - tz0;

    FT_Done_Face( face );

    printf( "\n" );
    printf( "rendered glyphs  = %d\n", rendered_glyphs );
    printf( "render time      = %f s\n", (double)t0 / 10000 );
    printf( "fails            = %d\n", Fail );
    printf( "average glyphs/s = %f\n",
            (double)rendered_glyphs / t0 * 10000 );

    printf( "total timing     = %f s\n", (double)tz0 / 10000 );
    printf( "Fails = %d\n", Fail );

    FT_Done_FreeType( library );

    exit( 0 );      /* for safety reasons */

    return 0;       /* never reached */
  }


/* End */