GIF: Store frame palette offset.

1 files changed, 7 insertions, 0 deletions

diff --git a/src/gif.c b/src/gif.c
index e9048f9..7f960d1 100644
--- a/src/gif.c
+++ b/src/gif.c
@@ -43,6 +43,9 @@ typedef struct nsgif_frame {
 	/** the index designating a transparent pixel */
 	uint32_t transparency_index;
 
+	/** offset to frame colour table */
+	uint32_t colour_table_offset;
+
 	/* Frame flags */
 	uint32_t flags;
 } nsgif_frame;
@@ -1130,6 +1133,10 @@ static nsgif_error nsgif__parse_colour_table(
 		return NSGIF_OK;
 	}
 
+	if (decode == false) {
+		frame->colour_table_offset = *pos - gif->buf;
+	}
+
 	ret = nsgif__colour_table_extract(
 			gif->local_colour_table, &gif->colour_layout,
 			2 << (frame->flags & NSGIF_COLOUR_TABLE_SIZE_MASK),