这里我们用到了freetype。进入官网 中下载最新的版本2.7的源代码和文件。freetype-2.7.tar.gz freetype-doc-2.7.tar.gz

首先我们在使用官方提供的程序在pc上运行一下。需要安装zlib库。

在freetype-doc-2.7.tar.gz文件中的docus目录下的tutorial有一个example.c的源文件。

example.c：

/* example1.c                                                      *//*                                                                 *//* This small program shows how to print a rotated string with the *//* FreeType 2 library.                                             */#include 
     
      #include 
      
       #include 
       
        #include 
        
         #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. */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_GlyphSlot  slot;  FT_Matrix     matrix;                 /* transformation matrix */  FT_Vector     pen;                    /* untransformed origin  */  FT_Error      error;  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 );  angle         = ( 0.0 / 360 ) * 3.14159 * 2;      /* use 0 degrees  旋转     */  target_height = HEIGHT;  error = FT_Init_FreeType( &library );              /* initialize library */  /* error handling omitted */  error = FT_New_Face( library, filename, 0, &face );/* create face object */  /* error handling omitted */  /* use 50pt at 100dpi */  error = FT_Set_Char_Size( face, 50 * 64, 0,                            30, 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 (40,0) relative to the upper left corner  */  pen.x = 0 * 64;  pen.y = ( target_height - 40 ) * 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;}/* EOF */
        
       
      
     

 程序中把输出的字符打印在屏幕上，分辨率是640*480，从300,200 处开始显示.这里我为了便于查看就改为了80*80.从40，0处开始显示

 编译：

gcc -o example1 example1.c -I /usr/local/include/freetype2/ -lfreetype -lm

 运行程序即可。

arm：

首先配置：

./configure --host=arm-linux make make DESTDIR=$PWD/tmp install

将生成的文件拷贝到交叉编译器和开发板文件系统相应的位置。

编译文件：

arm-linux-gcc -o test main.c  -lfreetype -lm

将test和字体文件拷贝到开发板中即可运行程序.

源代码：

#include 
     
      #include 
      
       #include 
       
        #include 
        
         #include 
         
          #include 
          
           #include 
           
            #include 
            
             #include 
             
              #include "show_font.h"#include 
              
               #include FT_FREETYPE_Hunsigned char *hzkmem;unsigned char *fbmem;unsigned int line_width;unsigned int pixel_width;struct fb_var_screeninfo var;void lcd_put_pixel( int x, int y, unsigned int color ){ unsigned char *pen_8 = fbmem +y*line_width + x*pixel_width; unsigned short *pen_16; unsigned short *pen_32; unsigned char red,green,blue; pen_16 = (unsigned short *)pen_8; pen_32 = (unsigned short *)pen_8; switch( pixel_width*8 ) { case 8: *pen_8 = color; break; case 16: /* 565 */ red = (color>>16) & 0xff; green = (color>>8) & 0xff; blue = (color>>0) & 0xff; color = ((red>>3)<<11) | ((green>>2)<<5) |((blue>>3)); *pen_16 = color; break; case 32: *pen_32 = color; break; default: printf("can't support %ddpp\n",pixel_width*8 ); break; }}void lcd_put_ascii( int x, int y, unsigned char c ){ unsigned char *dots = (unsigned char *)&fontdata_8x16[c*16]; int i,b; unsigned char byte; for( i=0; i< 16; i++ ) { byte = dots[i]; for( b=7;b>=0;b--) { if( byte & (1<
               
                =0; b-- ) { if( byte & (1<
                
                 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 >= var.xres || j >= var.yres ) continue; //image[j][i] |= bitmap->buffer[q * bitmap->width + p]; lcd_put_pixel(i,j,bitmap->buffer[q * bitmap->width + p]); } }}int main( int argc, char **argv ){ int hzk_fd; int fd_fb; struct fb_fix_screeninfo fix; int screen_size; FT_Library library; FT_Error error; FT_Face face; FT_Matrix matrix; /* transformation matrix */ FT_Vector pen; /* untransformed origin */ double angle; wchar_t *chinese_char = L"周zhou"; unsigned char str[]={ 0xd6,0xd0}; struct stat hzk_stat; fd_fb = open("/dev/fb0", O_RDWR ); if( fd_fb<0 ) { perror("oepn failed"); return -1; } if( ioctl( fd_fb, FBIOGET_VSCREENINFO, &var ) ) { printf("can't get var\n"); return -1; } if( ioctl( fd_fb, FBIOGET_FSCREENINFO, &fix ) ) { printf("can't get fix\n"); return -1; } line_width = var.xres * var.bits_per_pixel / 8; pixel_width = var.bits_per_pixel / 8; screen_size = var.xres * var.yres * var.bits_per_pixel / 8; fbmem = (unsigned char *)mmap( NULL, screen_size, PROT_READ | PROT_WRITE, MAP_SHARED,fd_fb,0 ); if( fbmem == (unsigned char *)-1 ) { printf("mmap is failed\n"); return -1; } hzk_fd = open("HZK16", O_RDONLY ); if( hzk_fd<0 ) { printf("can't open hzk\n"); return -1; } if( fstat(hzk_fd, &hzk_stat)) { printf("can't get fstat\n"); return -1; } hzkmem = (unsigned char *)mmap( NULL, hzk_stat.st_size, PROT_READ, MAP_SHARED,hzk_fd,0 ); if( hzkmem == (unsigned char *)-1 ) { printf("mmap hzk is failed\n"); return -1; } memset( fbmem, 0, screen_size ); lcd_put_ascii(var.xres/2,var.yres/2,'A' ); printf("chinese code : %02x %02x\n", str[0],str[1]); lcd_put_chinese( var.xres/2 +8 ,var.yres/2, str ); if( argc != 2 ) { printf("Usage: %s 
                 
                  \n", argv[0]); return -1; } error = FT_Init_FreeType( &library ); /* initialize library */ /* error handling omitted */ error = FT_New_Face( library, argv[1], 0, &face ); /* create face object */ /* use 50pt at 100dpi */ error = FT_Set_Pixel_Sizes( face, 30, 0 ); /* set character size */ angle = ( 0.0 / 360 ) * 3.14159 * 2; /* use 25 degrees */ /* 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 (40,0) relative to the upper left corner */ pen.x = (var.xres/2+8+16) * 64; pen.y = ( var.yres/2 - 16 ) * 64; /* set transformation */ FT_Set_Transform( face, &matrix, &pen ); /* load glyph image into the slot (erase previous one) */ error = FT_Load_Char( face, chinese_char[0], FT_LOAD_RENDER ); if(error) { printf("FT_load_char error\n"); return -1; } draw_bitmap( &face->glyph->bitmap, face->glyph->bitmap_left, var.yres - face->glyph->bitmap_top ); return 0;}
                 
                
               
              
             
            
           
          
         
        
       
      
     

 

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