misc/libfreetype/docs/PROBLEMS
author koda
Wed, 27 Jul 2011 10:37:05 +0200
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This  file describes various  problems that  have been  encountered in
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compiling,  installing  and   running  FreeType  2.   Suggestions  for
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additions or other improvements to this file are welcome.
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Running Problems
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================
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* Some Type 1, Multiple Masters, and CID-keyed PostScript fonts aren't
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  handled correctly.
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-----
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Of course,  there might be  bugs in FreeType,  but some fonts based on
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the  PostScript  format can't  be handled indeed.  The reason  is that
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FreeType  doesn't contain a full  PostScript  interpreter  but applies
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pattern matching instead.  In case a font doesn't follow the  standard
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structure of the given font format, FreeType fails.  A typical example
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is Adobe's `Optima'  font family which  contains extra code  to switch
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between low and high resolution versions of the glyphs.
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It might be  possible to patch  FreeType in  some situations,  though.
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Please report failing fonts so that we investigate the problem and set
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up a list of such problematic fonts.
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* Why do identical FreeType  versions render differently  on different
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  platforms?
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Different distributions compile FreeType with different options.   The
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developer  version of  a  distribution's  FreeType  package,  which is
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needed to compile  your program  against FreeType,  includes the  file
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ftoption.h.  Compare  each platform's  copy of ftoption.h to  find the
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differences.
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Compilation Problems
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====================
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* I get an `internal compilation error' (ICE) while compiling FreeType
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  2.2.1 with Intel C++.
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  This has been reported for the following compiler version:
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    Intel(R) C++ Compiler for 32-bit applications,
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      Version 9.0 Build 20050430Z Package ID: W_CC_P_9.0.019
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-----
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The best solution is to update the compiler to version
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  Intel(R) C++ Compiler for 32-bit applications,
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    Version 9.1 Build 20060323Z Package ID: W_CC_P_9.1.022
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or newer.  If this isn't feasible, apply the following patch.
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--- src/cache/ftcbasic.c 20 Mar 2006 12:10:24 -0000 1.20
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+++ src/cache/ftcbasic.c.patched 15 May 2006 02:51:02 -0000
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@@ -252,7 +252,7 @@
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   */
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   FT_CALLBACK_TABLE_DEF
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-  const FTC_IFamilyClassRec  ftc_basic_image_family_class =
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+  FTC_IFamilyClassRec  ftc_basic_image_family_class =
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   {
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     {
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       sizeof ( FTC_BasicFamilyRec ),
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@@ -266,7 +266,7 @@
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   FT_CALLBACK_TABLE_DEF
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-  const FTC_GCacheClassRec  ftc_basic_image_cache_class =
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+  FTC_GCacheClassRec  ftc_basic_image_cache_class =
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   {
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     {
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       ftc_inode_new,
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--- end of PROBLEMS ---