[ft] FT_Outline_Get_Orientation vs FT_OUTLINE_REVERSE_FILL

[Ross Crawford]

Hi,

I have a program which uses Freetype to generate font outlines. It 
currently uses FT_Outline_Get_Orientation to decide (I thought!) on 
which direction the outlines are traced, and it seems to work with both 
Truetype and Type 1 fonts. But I have someone who wants to compile my 
program for their Mac, but it only comes with Freetype 2.1.4 installed, 
which doesn't have FT_Outline_Get_Orientation. I've basically said go 
get a newer version, but I started actually investigating, and found the 
FT_OUTLINE_REVERSE_FILL which IS supported in 2.1.4. Then I started 
debugging my program, and I found that FT_Outline_Get_Orientation is 
returning 0 for both Truetype and Type 1 fonts, but 
FT_OUTLINE_REVERSE_FILL is set to 0 for Truetype and 1 for Type 1.

So my question is, what is the relationship between the outline winding 
direction, FT_Outline_Get_Orientation, and FT_OUTLINE_REVERSE_FILL? Any 
information most appreciated. I probably won't end up supporting older 
versions of Freetype, but I would like to know exactly how these things 
interact.

Thanks

ROSCO