// These should be defined in the calling source...
// #local _T1 = text { ttf "/home/pokorny/Fonts/Hack-Regular.ttf" "A" 1.0, 0 }   //
// #local _T2 = text { ttf "/home/pokorny/Fonts/Hack-Regular.ttf" "AA" 1.0, 0 }  //
// #local _T3 = text { ttf "/home/pokorny/Fonts/Hack-Regular.ttf" "│" 1.0, 0 }

// The 'bar' is full height box character.  Fills ascender / descender regions.
// Might just using 1.0 be better?  Or something in between...

#local _T1sz = max_extent(_T1) - min_extent(_T1);
#local _T2sz = max_extent(_T2) - min_extent(_T2);
#local _T3sz = max_extent(_T3) - min_extent(_T3);
#declare _Unit_width  = (_T2sz - _T1sz).x;
#declare _Unit_height =          _T3sz.y;

// The _Unit_width  = Below very close to ttfdump's for 'LiberationMono-Regular.ttf'
//     'hhea' Table - Horizontal Header (advanceWidthMax: 1229)
//     (There is also a xMaxExtent: 1247)
// divided by:
//     'head' Table - Font Header (unitsPerEm: 2048)


// The _Unit_height  = Below very close to ttfdump's
//     'head' Table - Font Header (unitsPerEm: 2048)
//         yMin: -615
//         yMax: 1705
//         (yMax - yMin)
//  OR
//     'hhea' Table - Horizontal Header
//         yAscender: 1705
//         yDescender: -615
//         yLineGap: 0
//         (yAscender - yDescender + yLineGap)
// divided by:
//     'head' Table - Font Header (unitsPerEm: 2048)  <-- This used to normalize within POV-Ray

//                                                               Use ttfdump info to update
//#debug concat("_Unit_width  = ",str(_Unit_width, 25,17),"   (",str(1229/2048, 25,17),")\n")
//#debug concat("_Unit_height = ",str(_Unit_height,25,17),"   (",str((1705+615)/2048, 25,17),")\n\n")
//#error "\nStop"