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-rw-r--r--fastiv-io.h4
1 files changed, 4 insertions, 0 deletions
diff --git a/fastiv-io.h b/fastiv-io.h
index 7bce925..20fa4f6 100644
--- a/fastiv-io.h
+++ b/fastiv-io.h
@@ -37,6 +37,10 @@ extern cairo_user_data_key_t fastiv_io_key_icc;
/// The next frame in a sequence, as a surface, in a chain, pre-composited.
/// There is no wrap-around.
extern cairo_user_data_key_t fastiv_io_key_frame_next;
+/// The previous frame in a sequence, as a surface, in a chain, pre-composited.
+/// This is a weak pointer that wraps around, and needn't be present
+/// for static images.
+extern cairo_user_data_key_t fastiv_io_key_frame_previous;
/// Frame duration in milliseconds as an intptr_t.
extern cairo_user_data_key_t fastiv_io_key_frame_duration;
/// How many times to repeat the animation, or zero for +inf, as a uintptr_t.