Displaying Unicode characters with FreeType

Use FreeType to load vector fonts, TTF font files, through the character's unicode,load a character's dot matrix. Unicode use of Chinese characters can be expressed in 32bit, such as ' I ' Unicode is 0x6211

Defining Global Variables

Static Ft_library G_lib;
Static Ft_face G_face;

Initialize FreeType

<pre name= "code" class= "CPP" >pshowscreen<span style= "font-family:arial, Helvetica, Sans-serif;" > is Frambuffer's mapped memory address. </span>

int Show_char (int unicode,int fontsizepixel,mid_font_color fontcolor,int startx,int starty) {int charUnicode = Un
	Icode;
	int index,x,y;
	Ft_glyph Glyph;
	unsigned short int *pshowline;
	int error;

	Index =0;x=0;y = 0; if (Pshowscreen = = NULL) {printf ("<use osd_init not yet!!!

    	> \ n "); return-1;}
	
	Pshowline = (unsigned short int*) (Pshowscreen);
	Error = ft_set_pixel_sizes (g_face,fontsizepixel,fontsizepixel);
	if (Error!= 0) {return hi_failure;

        index = Ft_get_char_index (G_face,charunicode);
   	
	Error = Ft_load_glyph (G_face,index, Ft_load_default);

	Error = Ft_get_glyph (g_face->glyph, &glyph);
		
		
        if (!error) {error = Ft_glyph_to_bitmap (&glyph, Ft_render_mode_normal, 0, 1);
        Ft_bitmapglyph bitmap_glyph = (ft_bitmapglyph) glyph;
		
		
        Ft_bitmap *bitmap = &bitmap_glyph-> Bitmap; for (y = Starty y < bitmap->rows + starty, ++y) {for (x = startx; x < Bitmap->width +StartX;

	       ++X) {if (x < 0 | | | y < 0) continue; if (bitmap->buffer[(y-starty) * bitmap->width + (X-STARTX)]) {* (Pshowline + y * var.xres + x) =
		FontColor;
        }else{}} ft_done_glyph (Glyph);	
	Glyph = NULL;
	}else return-1;
return 0; }

Msg_print ("init error:%d,errno:%d \ n", Error,errno);} Error = Ft_new_face (g_lib,fontfile, 0, &g_face); if (Error!= 0) {msg_print ("Init FreeType error, please check font fil e \ n "); return-1;} Error = Ft_select_charmap (G_face, Ft_encoding_unicode); if (Error!= 0) {return-1;}

Load Unicode

Release FreeType

int Freetype_realse () {
	ft_done_face (g_face);
	Ft_done_freetype (g_lib);
	return 0;
}