freetype（demo）

来源：互联网发布：淘宝一分钱壁纸编辑：程序博客网时间：2024/05/21 20:30

freetype显示一行文字：

#include <stdio.h>  #include <string.h>  #include <math.h>    #include <ft2build.h>  #include FT_FREETYPE_H      #define WIDTH   80  #define HEIGHT  80      /* origin is the upper left corner */  unsigned char image[HEIGHT][WIDTH];      /* Replace this function with something useful. */    void  draw_bitmap( FT_Bitmap*  bitmap,               FT_Int      x,               FT_Int      y)  {    FT_Int  i, j, p, q;    FT_Int  x_max = x + bitmap->width;    FT_Int  y_max = y + bitmap->rows;        for ( i = x, p = 0; i < x_max; i++, p++ )    {      for ( j = y, q = 0; j < y_max; j++, q++ )      {        if ( i < 0      || j < 0       ||             i >= WIDTH || j >= HEIGHT )          continue;          image[j][i] |= bitmap->buffer[q * bitmap->width + p];      }    }  }      void  show_image( void )  {    int  i, j;        for ( i = 0; i < HEIGHT; i++ )    {      for ( j = 0; j < WIDTH; j++ )        putchar( image[i][j] == 0 ? ' '                                  : image[i][j] < 128 ? '+'                                                      : '*' );      putchar( '\n' );    }  }      int  main( int     argc,        char**  argv )  {    FT_Library    library;    FT_Face       face;      FT_GlyphSlot  slot;                   /* transformation matrix */    FT_Vector     pen;                    /* untransformed origin  */    FT_Error      error;    FT_Matrix     matrix;      char*         filename;    char*         text;      double        angle;    int           target_height;    int           n, num_chars;          if ( argc != 3 )    {      fprintf ( stderr, "usage: %s font sample-text\n", argv[0] );      exit( 1 );    }      filename      = argv[1];                           /* first argument     */    text          = argv[2];                           /* second argument    */    num_chars     = strlen( text );    target_height = HEIGHT;      error = FT_Init_FreeType( &library );              /* initialize library */    /* error handling omitted */      error = FT_New_Face( library, argv[1], 0, &face ); /* create face object */    /* error handling omitted */                    FT_Set_Pixel_Sizes(face, 24, 0);               /* set character size */      /* error handling omitted */      slot = face->glyph;      /* set up matrix */      matrix.xx = (FT_Fixed)( cos( angle ) * 0x10000L );      matrix.xy = (FT_Fixed)(-sin( angle ) * 0x10000L );      matrix.yx = (FT_Fixed)( sin( angle ) * 0x10000L );      matrix.yy = (FT_Fixed)( cos( angle ) * 0x10000L );            /* the pen position in 26.6 cartesian space coordinates; */    /* start at (0,40) relative to the upper left corner  */    pen.x = 0 * 64;    pen.y = ( target_height - 70 ) * 64;      for ( n = 0; n < num_chars; n++ )    {          /* set transformation */         FT_Set_Transform( face, &matrix, &pen );        /* load glyph image into the slot (erase previous one) */      error = FT_Load_Char( face, text[n], FT_LOAD_RENDER );      if ( error )        continue;                 /* ignore errors */        /* now, draw to our target surface (convert position) */      draw_bitmap( &slot->bitmap,                   slot->bitmap_left,                   target_height - slot->bitmap_top );        /* increment pen position */      pen.x += slot->advance.x;      pen.y += slot->advance.y;    }      show_image();      FT_Done_Face    ( face );    FT_Done_FreeType( library );      return 0;  }

freetype对换行的支持：

#include <stdio.h>#include <string.h>#include <math.h>#include <ft2build.h>#include FT_FREETYPE_H#include FT_GLYPH_H#define WIDTH   80#define HEIGHT  80/* origin is the upper left corner */unsigned char image[HEIGHT][WIDTH];/* Replace this function with something useful. */voiddraw_bitmap( FT_Bitmap*  bitmap,             FT_Int      x,             FT_Int      y){  FT_Int  i, j, p, q;  FT_Int  x_max = x + bitmap->width;  FT_Int  y_max = y + bitmap->rows;  for ( i = x, p = 0; i < x_max; i++, p++ )  {    for ( j = y, q = 0; j < y_max; j++, q++ )    {      if ( i < 0      || j < 0       ||           i >= WIDTH || j >= HEIGHT )        continue;      image[j][i] |= bitmap->buffer[q * bitmap->width + p];    }  }}voidshow_image( void ){  int  i, j;  for ( i = 0; i < HEIGHT; i++ )  {    for ( j = 0; j < WIDTH; j++ )      putchar( image[i][j] == 0 ? ' '                                : image[i][j] < 128 ? '+'                                                    : '*' );    putchar( '\n' );  }}intmain( int     argc,      char**  argv ){  FT_Library    library;  FT_Face       face;  FT_Glyph  glyph;  FT_GlyphSlot  slot;  FT_Vector     pen;                    /* untransformed origin  */  FT_BBox bbox;  FT_Error      error;  char*         filename;  unsigned int chinese[]={0x4e2d,0x56fd,0x4eba,0x4e2d};  int           target_height;  int           n, num_chars;  int line_box_yMin=1000;  int line_box_yMax=HEIGHT;  int line_box_xMin=0;  int line_box_xMax=-1000;  if ( argc != 2 )  {    fprintf ( stderr, "usage: %s font \n", argv[0] );    exit( 1 );  }  filename      = argv[1];                           /* first argument     */  target_height = HEIGHT;  error = FT_Init_FreeType( &library );              /* initialize library */  /* error handling omitted */  error = FT_New_Face( library, argv[1], 0, &face ); /* create face object */  /* error handling omitted */#if 0  /* use 50pt at 100dpi */  error = FT_Set_Char_Size( face, 50 * 64, 0,                            100, 0 );                /* set character size *//* pixels = 50 /72 * 100 = 69  */#elseFT_Set_Pixel_Sizes(face, 24, 0);#endif  /* error handling omitted */  slot = face->glyph;  /* the pen position in 26.6 cartesian space coordinates; */  /* start at (0,40) relative to the upper left corner  */  pen.x = 0 * 64;  pen.y = ( target_height - 24 ) * 64;  printf("%ld\n",sizeof(chinese));  for ( n = 0; n < sizeof(chinese)/4; n++ )  {    /* set transformation */    FT_Set_Transform( face, 0 , &pen );    /* load glyph image into the slot (erase previous one) */    error = FT_Load_Char( face, chinese[n], FT_LOAD_RENDER );    if ( error )      continue;                 /* ignore errors */    error = FT_Get_Glyph( slot , &glyph );    if (error){    printf("FT_Get_Glyph error!\n");    return -1;}    FT_Glyph_Get_CBox(glyph, FT_GLYPH_BBOX_TRUNCATE, &bbox );    printf("x.min:%ld x.max:%ld\n",bbox.xMin,bbox.xMax);    printf("y.min:%ld y.max:%ld\n",bbox.yMin,bbox.yMax);    if(line_box_yMin>bbox.yMin){line_box_yMin=bbox.yMin;    }    if(bbox.xMax>WIDTH){pen.x = 0 * 64;pen.y = (target_height-line_box_yMax+line_box_yMin-24) * 64;FT_Set_Transform( face, 0 , &pen );error = FT_Load_Char( face, chinese[n], FT_LOAD_RENDER );        if ( error )            continue;                 /* ignore errors */    }    /* now, draw to our target surface (convert position) */    draw_bitmap( &slot->bitmap,                 slot->bitmap_left,                 target_height - slot->bitmap_top );    /* increment pen position */    pen.x += slot->advance.x;  }  show_image();  FT_Done_Face    ( face );  FT_Done_FreeType( library );  return 0;}/* EOF */

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