[freetype2] master 53fea87 09/68: Add config option to test for 'COLR' v1 support in headers.

[Werner Lemberg]

branch: master
commit 53fea877458e7d47b53e924c3710bbe739651ed2
Author: Dominik Röttsches <drott@chromium.org>
Commit: Werner Lemberg <wl@gnu.org>

    Add config option to test for 'COLR' v1 support in headers.
    
    * include/freetype/config/ftoption.h (TT_SUPPORT_COLRV1): New macro
    so that clients can test whether the FreeType checkout that they are
    building against supports the 'COLR' v1 API.  This is intended to be
    a temporary solution until 'COLR' v1 support is released in a
    FreeType version and such a check can be made by using the version
    number instead.
---
 ChangeLog                          | 11 +++++++++++
 include/freetype/config/ftoption.h | 15 +++++++++++++++
 2 files changed, 26 insertions(+)

diff --git a/ChangeLog b/ChangeLog
index 33fa5a5..eee3100 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,14 @@
+2021-01-13  Dominik Röttsches  <drott@chromium.org>
+
+       Add config option to test for 'COLR' v1 support in headers.
+
+       * include/freetype/config/ftoption.h (TT_SUPPORT_COLRV1): New macro
+       so that clients can test whether the FreeType checkout that they are
+       building against supports the 'COLR' v1 API.  This is intended to be
+       a temporary solution until 'COLR' v1 support is released in a
+       FreeType version and such a check can be made by using the version
+       number instead.
+
 2020-12-16  Dominik Röttsches  <drott@chromium.org>
 
        [base] Fill 'COLR' v1 API templates to make them work (#59703).
diff --git a/include/freetype/config/ftoption.h 
b/include/freetype/config/ftoption.h
index 147fe6d..d013a62 100644
--- a/include/freetype/config/ftoption.h
+++ b/include/freetype/config/ftoption.h
@@ -979,6 +979,21 @@ FT_BEGIN_HEADER
 
 
   /*
+   * The TT_SUPPORT_COLRV1 macro is defined to indicate to clients that this
+   * version of FreeType has support for 'COLR' v1 API.  This definition is
+   * useful to FreeType clients that want to build in support for 'COLR' v1
+   * depending on a tip-of-tree checkout before it is officially released in
+   * FreeType, and while the feature cannot yet be tested against using
+   * version macros.  Don't change this macro.  This may be removed once the
+   * feature is in a FreeType release version and version macros can be used
+   * to test for availability.
+   */
+#ifdef TT_CONFIG_OPTION_COLOR_LAYERS
+#define  TT_SUPPORT_COLRV1
+#endif
+
+
+  /*
    * Check CFF darkening parameters.  The checks are the same as in function
    * `cff_property_set` in file `cffdrivr.c`.
    */