brace size issue, and suggestion for compositing

Hello group,

By technical necessity or by design, the SMuFL/Bravura brace glyphs 
(0xE000, 0xE001) are equal in height to 5 staff lines.  In the most 
typical use case, drawing a grand staff, that means the brace glyphs 
must be drawn with a font size 4-5x greater than all other glyphs.

This causes a specific problem when drawing with Windows GDI, namely 
that GDI disables antialiasing above a certain font height, with no 
workaround.  This means Bravura cannot be used, out of the box, with 
GDI.  Screenshot here, GDI on the right: 
http://stash.reaper.fm/29696/svg-vs-otf.png

(This is not about the merits or demerits of using GDI; the fundamental 
issue is that as far as I know, these are the only glyphs that are 
designed to be drawn at a radically different size from the rest, which 
creates at least one known problem.  Also, I am aware that alternate 
brace glyphs are defined, but these do not address the problem, as they 
are the same height, but different aspect ratios.)

I suggest adding new glyphs that could be used to composite a brace at 
various heights, similar to how 0xE003-0xE006 can be used to composite a 
square bracket at any height.  Doing this for the brace would require 
adding at least 8 new glyphs: top, top-mid, mid-bottom, and bottom, for 
both left and right facing braces. Ideally multiple sets of compositable 
glyphs could be added for various brace heights.

Best,
John Schwartz
Cockos Inc (REAPER)