TextBase Layer
gr.text_base must be updated 30fps in your Fs->draw_it() callback.  You probably 
want GrPrint() or just Print().  The DolDoc code takes care of plotting text to 
gr.text_base.

Bits 0-7        8-Bit ASCII Scrn Code
Bits 8-11       Foreground color
Bits 12-15      Background color
Bits 16-20      Signed X pos shift val
Bits 21-25      Signed Y pos shift val
Bit  28         Blink
Bit  29         Inverted (Swap foreground and background)
Bit  30         Sel (XOR colors with FF)
Bit  31         Underline

GrUpdateTaskWin() calls DocUpdateTaskDocs() which calls DocRecalc() where the 
document text is plotted into gr.text_base.  Then, GrUpdateTextBG() and 
GrUpdateTextFG() render the gr.text_base onto gr.dc2, a raw graphic bitmap.

See ::/Demo/Games/Maze.HC.

TextBorder          Funct Plot border square. 30fps in Fs->draw_it() callback.
TextChar            Funct Plot char. 30fps in Fs->draw_it() callback.
TextLenAttr         Funct Plot attrs with len. 30fps in Fs->draw_it() callback.
TextLenAttrStr      Funct Plot attr str with len. 30fps in Fs->draw_it() callback.
TextLenStr          Funct Plot str with len. 30fps in Fs->draw_it() callback.
TextPrint           Funct Plot chars. 30fps in Fs->draw_it() callback.
TextRect            Funct Fill text rect. 30fps in Fs->draw_it() callback.


                              
TextBase Layer/Char
CTextGlbls          Class class CTextGlbls
TEXT_COLS           DefineStr HashPublic("TEXT_COLS",HTT_DEFINE_STR);;;
TEXT_ROWS           DefineStr HashPublic("TEXT_ROWS",HTT_DEFINE_STR);;;
text                GlbVar CTextGlbls text;