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    Need information about font tool

    RickyngkRickyngk Member
    edited June 2012 in General questions
    After export font with Gideros font tool, I've got a file .txt, like:

    0
    32
    1 1
    0 0
    0 0
    256 0

    33
    17 1
    2 10
    1 10
    256 0

    Would you please let me know more information about this file, and how it's used in TextField
    Afaik:
    33 --> char code
    17 1 --> letter position in image
    2 10 --> size of letter
    1 10 --> base height, and unknown value
    256 0 --> unknown

    font-descent-height = size[0] - base_height

    Regards,

    http://www.guava7.com/
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    Comments

    • gorkemgorkem Maintainer
      See: http://www.giderosmobile.com/forum/discussion/comment/6215#Comment_6215

      @atilim would it be nice to include this information in reference document? Shall I file a request for this on bugs.giderosmobile.com?

      Likes: MikeHart

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    • RickyngkRickyngk Member
      edited June 2012
      Dear gorken,
      I think there're something different here:
      For font arial - italic size11, letter A (see attachment)

      65
      79 40
      8 8
      -1 8
      448 0

      I dont know clearly (-1, 8), and (448, 0) is used for. About (448, 0) , I think that it's not relative to dx2, dy2 as http://www.giderosmobile.com/forum/discussion/comment/6215#Comment_6215
      because size of image is 114x143 <<< 448

      Regards,

      example.png
      114 x 143 - 11K
      http://www.guava7.com/
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    • atilimatilim Maintainer
      edited June 2012
      Hi,

      We're using FreeType2 to render fonts and all these values are related to FreeType2's glyph metrics: http://www.freetype.org/freetype2/docs/tutorial/step2.html

      33 --> char code
      17 1 --> letter position in image
      2 10 --> size of letter
      1 10 --> bearingX, bearingY (or bitmap_left, bitmap_top)
      256 0 --> advanceX, advanceY (multiplied by 64)

      Here bearing is used to render the glyph at correct position and advance is used to move the pointer to the next position (advanceY is always 0).

      here is a code from http://www.freetype.org/freetype2/docs/tutorial/step1.html to render a text which explains these values:
      pen_x = 300;
pen_y = 200;
for ( n = 0; n < num_chars; n++ )
{
    /* ............... */
 
    /* now, draw to our target surface */ 
    my_draw_bitmap( &slot->bitmap, pen_x + slot->bitmap_left, pen_y - slot->bitmap_top ); 
 
    /* increment pen position */ 
    pen_x += slot->advance.x >> 6;
    pen_y += slot->advance.y >> 6; /* not useful for now */
}
      http://en.wikipedia.org/wiki/Cytorus
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    • RickyngkRickyngk Member
      Very useful, Thank @atilim!
      http://www.guava7.com/
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    • RickyngkRickyngk Member
      edited July 2012
      I'd like to give a clear figure ;)
      Gideros_font_format.png
      411 x 556 - 15K

      Likes: phongtt, atilim

      http://www.guava7.com/
      +1 -1 (+2 / -0 )Share on Facebook
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