Re: [ft] Fw: [ft-devel] fitting a text

[folkert]

> My code prints out the computed bitmap dimensions (including
> fractions); do the numbers agree with what you calculate?

Totally different. Also your script emits different values from my code.
I converted your python script to c++:

your script:

char 95 wxh = 6x1 ascender -1 bearingx -1 kern 0
char 103 wxh = 6x7 ascender 5 bearingx 0 kern 0
char 113 wxh = 6x6 ascender 5 bearingx 0 kern 0
char 116 wxh = 3x6 ascender 6 bearingx 0 kern 0
char 101 wxh = 5x5 ascender 5 bearingx 0 kern 0
char 115 wxh = 5x5 ascender 5 bearingx 0 kern 0
char 116 wxh = 3x6 ascender 6 bearingx 0 kern 0
char 49 wxh = 6x7 ascender 7 bearingx 2 kern 0
char 50 wxh = 6x7 ascender 7 bearingx 1 kern 0
char 51 wxh = 6x7 ascender 7 bearingx 0 kern 0
bitmap dimensions wxh = 52x9

my c++ version:

char 95 w×h = 64×64 ascender 0 bearingx -64 kern 0
char 103 w×h = 64×128 ascender 64 bearingx 0 kern 0
char 113 w×h = 64×128 ascender 64 bearingx 0 kern 0
char 116 w×h = 0×128 ascender 64 bearingx 0 kern 0
char 101 w×h = 64×128 ascender 64 bearingx 0 kern 0
char 115 w×h = 64×128 ascender 64 bearingx 0 kern 0
char 116 w×h = 0×128 ascender 64 bearingx 0 kern 0
char 49 w×h = 64×64 ascender 64 bearingx 0 kern 0
char 50 w×h = 64×64 ascender 64 bearingx 0 kern 0
char 51 w×h = 64×128 ascender 64 bearingx 0 kern 0
bitmap dimensions w×h = 512×128

Even when ignoring the multiple-of-64 it is totally different.
I checked that I'm using the same font-file.

          w = 0;
  
          int max_ascender = 0, max_descender = 0;
          int prev_glyph_index = -1;
          for(unsigned int n = 0; n < text.size(); n++)
          {
                // same problem with FT_LOAD_DEFAULT
                  if (FT_Load_Char(face, text.at(n), FT_LOAD_RENDER))
                          continue;
  
                  int glyph_index = FT_Get_Char_Index(face, text.at(n));
  
                  int kern = 0;
                  if (prev_glyph_index != -1)
                  {
                          FT_Vector akern;
                          FT_Get_Kerning(face, prev_glyph_index, glyph_index, 
FT_KERNING_DEFAULT, &akern);
                          kern = akern.x;
                  }
  
                  w += face -> glyph -> metrics.horiAdvance + kern;
  
                  max_ascender = std::max(max_ascender, int(face -> glyph -> 
metrics.horiBearingY));
                  max_descender = std::max(max_descender, int(face -> glyph -> 
metrics.height - face -> glyph -> metrics.horiBearingY));
  
                  printf("char %d w×h = %d×%d ascender %d bearingx %d kern 
%d\n", text.at(n), face -> glyph -> metrics.horiAdvance, face -> glyph -> 
metrics.height, face -> glyph   -> metrics.horiBearingY, face -> glyph -> 
metrics.horiBearingX, kern);
  
                  prev_glyph_index = glyph_index;
          }
  
          h = max_ascender + max_descender;
          printf("bitmap dimensions w×h = %d×%d\n", w, h);


Folkert van Heusden

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