Re: [ft-devel] porting: Where should i start debugging

[duhuanpeng]

Dear all,
I can show the fonts on my pc now, thanks to Werner very much.

I read this page again:
https://www.freetype.org/freetype2/docs/glyphs/glyphs-7.html#section-2

And my code is here:
void dump_ft_bitmap( FT_Bitmap* bitmap)
{
        unsigned int i, j;
        unsigned q;

        unsigned rows = bitmap->rows;
        unsigned width = bitmap->width;
        int pitch = bitmap->pitch;


        unsigned char ch;

        q = 0;

        for(i=0; i<rows; i++) {
                for (j=0; j<width; j+=pitch) {
                        ch = bitmap->buffer[q];
                        dump_byte(ch);
                        q++;
                }
                printf("\r\n");
        }
}


slot->bitmap->pixel_mode:(1)
slot->bitmap->pitch:(4)
                                
     O        O                 
 OOOOOOOOOOOOOOO                
 OO OO    OO                    
 OO OO    OO                    
 OO OO    OO                    
 OO OO    OOO                   
 OO OO    OOOO                  
 OO OO    OO OO                 
 OO OO    OO OOO                
 OO OO    OO  O                 
 OOOOO    OO                    
 OO OO    OO                    
          OO                    
          OO                    
          OO                    
slot->bitmap->pixel_mode:(1)
slot->bitmap->pitch:(4)
      O      O                  
  O    O     OO                 
   O   OO   OO                  
   OO  OO   OO                  
    OO  OO  O                   
    OO  OO OO                   
    O   O  O                    
          O   O                 
 OOOOOOOOOOOOOOO                
      O  O                      
     OOO  O                     
     OO   OO                    
    OO     OO                   
   OO       OO                  
  OO        OOO                 
 O           O                  
slot->bitmap->pixel_mode:(1)
slot->bitmap->pitch:(4)


Now I am going to run this code on my target board.
Thank you all again.

Regards,
duhuanpeng

-----Original Message-----
From: duhuanpeng [mailto:address@hidden 
Sent: Saturday, March 03, 2018 8:31 PM
To: 'Werner LEMBERG'
Cc: 'address@hidden'; 'address@hidden'; address@hidden
Subject: RE: [ft-devel] porting: Where should i start debugging

Dear Werner,
First, thank you very much for your replying.

>* Your `dump_bitmap' version only produces crap for bitmap fonts (the
>  original function in the sample code doesn't work either, BTW – I've
>  just added a comment to `example1.c').  Reason is that you don't
>  check the buffer format of `slot->bitmap->pixel_mode', which is
>  FT_PIXEL_MODE_MONO in this case (meaning 8 pixels per byte).

Ah, I have change my code to below, take a look at 
https://paste.ubuntu.com/p/9MxcP5czZt/
line 77, 97

The output still *not* correct:

          *--*^M
          |      OOOOO     |^M
          |  O  OOOOOO   O |^M
          | O   O    OO   O|^M
          |   O   OOO   O  |^M
          |OOO O O         |^M
          | OOOO      OO OO|^M
          |  OO OO        O|^M
          |  OOO OO       O|^M
          |                |^M
          |O     O        O|^M
          | OO   OO        |^M
          |                |^M
          |O  O OO        O|^M
          |   O            |^M
          |OO  O      OO OO|^M
          |                |^M
          *--*^M
See more (https://paste.ubuntu.com/p/NyXKB3CHd9/)

What is the FT_PIXEL_MODE_MONO bitmap format?
The output above is
Byte[0] Byte[1] (bit order 7-0)
Byte[3] byte[4]
Byte[5] byte[6]
...(more)...
Byte[30] Byte[31]

>* `FT_Load_Char' doesn't work for `gbst16.pcf' as expected.  Reason is
>  that this font is not encoded in Unicode (it is rather using GB2312
>  encoding), thus FreeType can't set up a cmap.  In this case,
>  `FT_Load_Char' behaves like `FT_Load_Glyph', this is, it handles the
>  input character codes as glyph indices.

>  You have to manually convert input character codes to glyph indices  
> (for example, using `iconv'), then using `FT_Load_Glyph'.
My input character is below, it is a interger. I guess at least, I guess it 
will Show some character?
  for(ch=97; ch<65535; ch++) {
    ...
  }

By the way, my git repo is here, I am trying to make freetype compiled by keil:
https://gitee.com/m32/freetype2

Keil is quite popular IDE for MCU, hope you can give me some suggestion.

Regards,
duhuanpeng