vg_build_font.h

   1 #include "vg_font.h"
   2
   3 #define STB_IMAGE_IMPLEMENTATION
   4 #include "submodules/stb/stb_image.h"
   5
   6 void vg_build_font_face_run( vg_font_face *face,
   7                              char first, char last, i16 x, i16 y )
   8 {
   9    u32 uf = *((u8 *)&first),
  10        ul = *((u8 *)&last);
  11
  12    u32 count = ul - uf;
  13    for( u32 i=0; i<=count; i ++ )
  14    {
  15       u32 index = uf + i;
  16       face->map[index].x = x+(i*face->cw);
  17       face->map[index].y = y;
  18    }
  19 }
  20
  21 void vg_build_write_font_face( FILE *fp, vg_font_face *face )
  22 {
  23    fprintf( fp, "vg_font_face %s = {\n", face->name );
  24    fprintf( fp, "   .name=\"%s\",\n", face->name );
  25    fprintf( fp, "   .cw=%hd,.ch=%hd,\n", face->cw,face->ch );
  26    fprintf( fp, "   .sx=%hd,.sy=%hd,\n", face->sx,face->sy );
  27    fprintf( fp, "   .baseline=%hd,\n", face->baseline );
  28    fprintf( fp, "   .map={\n" );
  29
  30    u32 chars = 0;
  31
  32    for( u32 i=0; i<256; i ++ )
  33    {
  34       if( face->map[i].x || face->map[i].y )
  35       {
  36          chars += fprintf( fp, "[%u]={%hd,%hd},",
  37                            i, face->map[i].x, face->map[i].y );
  38
  39          if( chars > 80 )
  40          {
  41             fprintf( fp, "\n" );
  42             chars = 0;
  43          }
  44       }
  45    }
  46
  47    fprintf( fp, "\n}};\n\n" );
  48 }
  49
  50 void vg_build_font_sheet( FILE *fp, char *name, const char *source )
  51 {
  52         int x,y,n;
  53         unsigned char *data = stbi_load( source, &x, &y, &n, 4 );
  54
  55    if( !data )
  56    {
  57                 vg_error( "Couldn't open source file\n" );
  58                 return;
  59    }
  60
  61    fprintf( fp, "vg_font_sheet %s = {\n", name );
  62    fprintf( fp, "   .w=%d, .h=%d,\n", x,y );
  63    fprintf( fp, "   .bitmap={\n" );
  64
  65    u32 pixel_max = x*y;
  66    u32 pixel = 0, chars = 0;
  67    while( pixel_max )
  68    {
  69       u32 buff = 0;
  70       for( int b = 31; b >= 0; b-- )
  71       {
  72          buff |= data[pixel*4]>128?0x1<<b:0;
  73          pixel++;
  74
  75          if( pixel >= pixel_max )
  76          {
  77             pixel_max = 0;
  78             break;
  79          }
  80       }
  81
  82       chars += fprintf( fp, "%#x,", buff );
  83       if( chars > 80 )
  84       {
  85          fprintf( fp, "\n" );
  86          chars = 0;
  87       }
  88    }
  89
  90    fprintf( fp, "\n}};\n" );
  91    free( data );
  92 }
  93
  94 void vg_build_default_font(void)
  95 {
  96    FILE *fp = fopen( "vg/vg_default_font.gc", "w" );
  97    vg_build_font_sheet( fp, "vg_default_font_sheet",
  98                          "vg/src/fonts/vg_font_thin_3.png" );
  99    vg_font_face small =
 100    {
 101       .name = "vgf_default_small",
 102       .cw=8, .ch=14,
 103       .sx=8, .sy=14,
 104       .baseline = 4
 105    };
 106    vg_build_font_face_run( &small, '!', '/', 8,  0  );
 107    vg_build_font_face_run( &small, '[', '`', 128,0  );
 108    vg_build_font_face_run( &small, '{', '~', 176,0  );
 109    vg_build_font_face_run( &small, ':', '@', 208,0  );
 110    vg_build_font_face_run( &small, 'A', 'Z', 0,  14 );
 111    vg_build_font_face_run( &small, 'a', 'z', 0,  28 );
 112    vg_build_font_face_run( &small, '0', '9', 208,14 );
 113    vg_build_font_face_run( &small, 0x7f, 0xa4, 0,42 );
 114    vg_build_font_face_run( &small, 0xb0, 0xb3, 208,28 );
 115    vg_build_write_font_face( fp, &small );
 116
 117    vg_font_face large =
 118    {
 119       .name = "vgf_default_large",
 120       .cw=12, .ch=21,
 121       .sx=12, .sy=21,
 122       .baseline=6,
 123    };
 124    vg_build_font_face_run( &large, '!', '/', 12, 56  );
 125    vg_build_font_face_run( &large, '[', '`', 192,56  );
 126    vg_build_font_face_run( &large, '{', '~', 264,56  );
 127    vg_build_font_face_run( &large, ':', '@', 324,56  );
 128    vg_build_font_face_run( &large, 'A', 'Z', 0,  77  );
 129    vg_build_font_face_run( &large, 'a', 'z', 0,  98  );
 130    vg_build_font_face_run( &large, '0', '9', 312,77  );
 131    vg_build_font_face_run( &large, 0x7f, 0xa4, 0,119 );
 132    vg_build_font_face_run( &large, 0xb0, 0xb3, 312,98 );
 133    vg_build_write_font_face( fp, &large );
 134
 135    vg_font_face title =
 136    {
 137       .name = "vgf_default_title",
 138       .cw=24, .ch=42,
 139       .sx=20, .sy=42,
 140       .baseline=12,
 141    };
 142    vg_build_font_face_run( &title, '!', '/', 24, 140 );
 143    vg_build_font_face_run( &title, '[', '_', 384,140 );
 144    vg_build_font_face_run( &title, '`', '`', 0,  182 );
 145    vg_build_font_face_run( &title, '{', '~', 24, 182 );
 146    vg_build_font_face_run( &title, ':', '@', 120,182 );
 147    vg_build_font_face_run( &title, 'A', 'U', 0,  224 );
 148    vg_build_font_face_run( &title, 'V', 'Z', 0,  308 );
 149    vg_build_font_face_run( &title, 'a', 'u', 0,  266 );
 150    vg_build_font_face_run( &title, 'v', 'z', 0,  350 );
 151    vg_build_font_face_run( &title, '0', '9', 120,308 );
 152    vg_build_font_face_run( &title, 0x89, 0x8c, 409,182 );
 153    vg_build_font_face_run( &title, 0x8d, 0x92, 360,308 );
 154    vg_build_font_face_run( &title, 0x7f, 0x88, 120,350 );
 155    vg_build_font_face_run( &title, 0x93, 0x98, 360,350 );
 156    vg_build_font_face_run( &title, 0x99, 0xa4, 0,392 );
 157    vg_build_font_face_run( &title, 0xb0, 0xb2, 288,392 );
 158    vg_build_write_font_face( fp, &title );
 159
 160    fclose( fp );
 161 }