freetype写BMP位图点阵

Freetype是将字库的字转换成一种色度的点阵，比如该例子中转换为256色的点阵。最终效果如下图

 

void *freetp_test(void *arg)

{

   unsigned char fontbuffer[1025];

 

#if 1

 

    printf("FT_Init_FreeType ");

   berror = FT_Init_FreeType(  & pFTLib );

   if ( berror ) { printf("FT_Init_FreeType %d",berror); }

  

   berror = FT_New_Face( pFTLib,

                                                        "/etc/arial.ttf",

                                                        0,

                                                        &pFTFace );

   printf("FT_Init_FreeType %d *****\n",berror);

   if ( ! berror) 

         { 

            printf("FT_Init_FreeType %d",berror);

            FT_Set_Char_Size(pFTFace,  16 << 6 ,  16 << 6 ,   300 ,  300 ); 

            FT_Glyph    glyph; 

                   //      load glyph 'C'   67 66 B

            FT_Load_Glyph(pFTFace, FT_Get_Char_Index(pFTFace, chr ), FT_LOAD_DEFAULT); 

            berror  =  FT_Get_Glyph(pFTFace -> glyph,  & glyph);        

                   if ( ! berror) 

                   { 

                            //      convert glyph to bitmap with 256 gray 

                      FT_Glyph_To_Bitmap( & glyph, ft_render_mode_normal,       0 ,  1 ); 

                      FT_BitmapGlyph         bitmap_glyph  =  (FT_BitmapGlyph)glyph; 

                      FT_Bitmap &         bitmap  =  bitmap_glyph -> bitmap;

                   //           while(1)

                   {

     printf("freetp_test  \n");

          const char *file_bmp = "/home/user/linaro.bmp";

 

          int fdb;

         fdb= open(file_bmp, O_CREAT|O_RDWR,S_IRUSR|S_IWUSR);

            if(fdb < 0)

                   {

                            printf("\n\n*************file creat fail***********\n\n");

                            exit(-1);

                   }

//      fdb= write(fdb,bitmap.buffer,bitmap.width*bitmap.rows);  

          SetstringPlay(bitmap.buffer,bitmap.width*bitmap.rows,bx,by,bitmap.width,bitmap.rows);

            if(fdb < 0)

                   {

                            printf("\n\n*************file write fail***********\n\n");

                            exit(-1);

                   }

            close(fdb);

          sleep(10);

         }

                    

                            for ( int  i = 0 ; i < bitmap.rows;  ++ i) 

                            { 

                                     for ( int  j = 0 ; j < bitmap.width;  ++ j) 

                                     { 

                                               //      if it has gray>0 we set show it as 1, o otherwise 

                                        printf( " %d " , bitmap.buffer[i * bitmap.width + j] ? 1 : 0 );     

                               } 

                               printf( " \n " ); 

                      } 

 

 

                            //      free glyph        

                      FT_Done_Glyph(glyph); 

                      glyph  =  NULL;      

            } 

                   //      free face 

            FT_Done_Face(pFTFace); 

            pFTFace      =  NULL; 

   } 

          

         //      free FreeType Lib 

   FT_Done_FreeType(pFTLib); 

   pFTLib  =  NULL; 

#endif

 

 

         }

        

        

}

 

ASCII吗字符表

 

在shell里打印的一个数字 7

 

 

 

最后在屏幕上显示的