[sfnt] Remove temporary runtime flag for variable 'COLR' v1.

Fixes #1187.

* src/sfnt/ttcolr.c (top level, read_paint, tt_face_load_colr,
tt_face_free_colr, get_deltas_for_var_index_base,
tt_face_get_color_glyph_clipbox, tt_face_get_colorline_stops): Remove macro
definition `VARIABLE_COLRV1_ENABLED` and its usage.

* src/truetype/ttdriver.c (tt_property_set): Remove parsing of
'TEMPORARY-enable-variable-colrv1' property name.

* src/truetype/ttobjs.h (TT_DriverRec): Remove `enable_variable_colrv1`
flag.

1 files changed, 3 insertions, 46 deletions

diff --git a/include/freetype/ftdriver.h b/include/freetype/ftdriver.h
index 3de6c6b7a..536b4966c 100644
--- a/include/freetype/ftdriver.h
+++ b/include/freetype/ftdriver.h
@@ -214,9 +214,9 @@ FT_BEGIN_HEADER
    *   itself, it is possible to control its behaviour with @FT_Property_Set
    *   and @FT_Property_Get.
    *
-   *   The TrueType driver's module name is 'truetype'; two properties are
-   *   available, @interpreter-version and @TEMPORARY-enable-variable-colrv1, as
-   *   documented in the @properties section.
+   *   The TrueType driver's module name is 'truetype'; a single property
+   *   @interpreter-version is available, as documented in the @properties
+   *   section.
    *
    *   To help understand the differences between interpreter versions, we
    *   introduce a list of definitions, kindly provided by Greg Hitchcock.
@@ -823,49 +823,6 @@ FT_BEGIN_HEADER
   /**************************************************************************
    *
    * @property:
-   *   TEMPORARY-enable-variable-colrv1
-   *
-   * @description:
-   *   Controls experimental support of variable COLRv1 and whether the COLRv1
-   *   implementation should take into account variation deltas. This tells the
-   *   COLRv1 API methods whether they should read from the font and apply
-   *   variable deltas to COLRv1 properties. The feature is default off.  When
-   *   on, variable COLRv1 deltas are applied for COLRv1 features for which they
-   *   are already implemented. When off, variable deltas are ignored even if
-   *   the respective PaintVar* table may already be understood.
-   *
-   *   WARNING: Temporary flag during development of variable COLRv1. This flag
-   *   will be removed, do not rely on it. Full variable COLRv1 support will be
-   *   announced separately.
-   *
-   * @note:
-   *   This property cannot be set via the `FREETYPE_PROPERTIES` environment
-   *   variable.
-   *
-   * @example:
-   *   The following example code demonstrates how to enable variable
-   *   COLRv1.
-   *
-   *   ```
-   *     FT_Library  library;
-   *     FT_Face     face;
-   *     FT_Bool     variable_colrv1 = TRUE;
-   *
-   *
-   *     FT_Init_FreeType( &library );
-   *
-   *     FT_Property_Set( library, "truetype",
-   *                               "TEMPORARY-enable-variable-colrv1",
-   *                               &variable_colr_v1 );
-   *   ```
-   *
-   * @since:
-   *   2.12.2
-   */
-
-  /**************************************************************************
-   *
-   * @property:
    *   svg-hooks
    *
    * @description: