[Bf-committers] [Patch] Add support for using (dynamically) system-wide FTGL libraries.

Chris Burt duositex+blender at gmail.com
Mon May 12 15:44:17 CEST 2008

Isn't there an option to just update our version of FTGL?


On Mon, May 12, 2008 at 6:50 AM, Sam Hocevar <sam at zoy.org> wrote:
> On Sun, May 11, 2008, Joe Eagar wrote:
>  > You make some very good points.  However, I have to disagree that our
>  > FTGL is pathologically buggy.  As far as I know, there's only 1 bug with
>  > textured fonts (a small visual artifact).
>    Oh, don't worry, it is. You are just lucky you do not use
>  FTGLExtrdFont or FTGLOutlineFont, because the most problematic part is
>  probably FTContour::FTContour(). First, tags are not sanitised through
>  FT_CURVE_TAG(), which means that some points in glyph curves may be
>  missed. Second, if the first loop iteration does not add a point to the
>  curve, it then crashes on line 86 (pointList[pointList.size() - 1]).
>  Also, on line 135, if pointIndex == numberOfPoints - 1, the routine
>  crashes on contour[pointIndex + 2].
>    Other crash points that do hit Blender are src/FTGLTextureFont.cpp,
>  line 110, and src/FTTextureGlyph.cpp, line 44. Integer values are not
>  sanitised and will cause divisions by zero with very small glyphs and/or
>  at very small font sizes.
>    There is also a potential problem in FTCharToGlyphIndexMap which I
>  haven't fully investigated yet, but using div() with an unsigned operand
>  does not seem right to me. Our unit tests do not cover Unicode very well
>  yet so that one will have to wait a bit (luckily it is not part of the
>  public API).
>  > The problem with shared libraries is that we have to trust someone
>  > else (and every single distributor) to not break the code. That's a
>  > lot of people to rely on.
>    Fully agreed. That's why I took the liberty to show up here. We wish
>  to release a version of FTGL with a stable public API that we do not
>  have to change later and we are checking that all projects which use
>  FTGL or embed copies of it still work with only minor changes.
>    While we are at it, are there any missing features in FTGL that you
>  would like to see? Vertical text and right-to-left text is the most
>  requested feature and even if we don't support it with the upcoming
>  release, we will add propers hooks so that it can be supported later
>  without changing the API.
>  Cheers,
>  --
>  Sam.
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