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[sfnt] Check safety of cast to `TT_Driver` before accessing member. 

* src/sfnt/ttcolr.c (VARIABLE_COLRV1_ENABLED): Access
`enable_variable_colrv1` only if driver class matches.
This commit is contained in:
Dominik Röttsches 2022-07-07 13:02:10 +03:00 committed by Werner Lemberg
parent d5d048bbfe
commit 8a9192f68e
1 changed files with 8 additions and 4 deletions
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12
src/sfnt/ttcolr.c
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@ -35,9 +35,11 @@
#include <freetype/ftcolor.h>
#include <freetype/config/integer-types.h>
/* the next code line is a temporary hack, to be removed together with */
/* `VARIABLE_COLRV1_ENABLED` and related code */
/* the next two code lines are a temporary hack, to be removed together */
/* with `VARIABLE_COLRV1_ENABLED` and related code as soon as variable */
/* 'COLR' support is complete and tested */
#include "../truetype/ttobjs.h"
#include "../truetype/ttdriver.h"
#ifdef TT_CONFIG_OPTION_COLOR_LAYERS
@ -55,8 +57,10 @@
#define COLR_HEADER_SIZE 14U
#define VARIABLE_COLRV1_ENABLED \
( ((TT_Driver)FT_FACE_DRIVER( face ))->enable_variable_colrv1 )
#define VARIABLE_COLRV1_ENABLED \
( ((TT_Driver)FT_FACE_DRIVER( face ))->root.clazz == \
&tt_driver_class && \
((TT_Driver)FT_FACE_DRIVER( face ))->enable_variable_colrv1 )
typedef enum FT_PaintFormat_Internal_