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