From 93506a7bf7a4461cb5fe1e5f507ee3cfa8653be3 Mon Sep 17 00:00:00 2001
From: Michael Niedermayer <michael@niedermayer.cc>
Date: Sun, 2 May 2021 15:49:55 +0200
Subject: [PATCH] avcodec/jpeglsdec: Set alpha plane in PAL8 so image is not
 100% transparent

Fixes: tickets/3933/128.jls

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit 011006874cb46325b6bc83234f81879ff421c05f)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
---
 libavcodec/jpeglsdec.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libavcodec/jpeglsdec.c b/libavcodec/jpeglsdec.c
index de1875ce30..a8d9eaa18a 100644
--- a/libavcodec/jpeglsdec.c
+++ b/libavcodec/jpeglsdec.c
@@ -122,7 +122,7 @@ int ff_jpegls_decode_lse(MJpegDecodeContext *s)
             s->avctx->pix_fmt = AV_PIX_FMT_PAL8;
             for (i=s->palette_index; i<=maxtab; i++) {
                 uint8_t k = i << shift;
-                pal[k] = 0;
+                pal[k] = wt < 4 ? 0xFF000000 : 0;
                 for (j=0; j<wt; j++) {
                     pal[k] |= get_bits(&s->gb, 8) << (8*(wt-j-1));
                 }