handle SPICE_STREAM_FLAGS_TOP_DOWN

1 files changed, 11 insertions, 2 deletions

diff --git a/gtk/channel-display.c b/gtk/channel-display.c
index 5ccf5dd..7e80b71 100644
--- a/gtk/channel-display.c
+++ b/gtk/channel-display.c
@@ -345,9 +345,18 @@ static void display_handle_stream_data(SpiceChannel *channel, spice_msg_in *in)
 
     if (st->out_frame) {
         SpiceMsgDisplayStreamCreate *info = spice_msg_in_parsed(st->msg_create);
+        uint8_t *data;
+        int stride;
+
+        data = st->out_frame;
+        stride = info->src_width * sizeof(uint32_t);
+        if (!(info->flags & SPICE_STREAM_FLAGS_TOP_DOWN)) {
+            data += stride * (info->src_height - 1);
+            stride = -stride;
+        }
         st->surface->canvas->ops->put_image
-            (st->surface->canvas, &info->dest, st->out_frame,
-             info->src_width, info->src_height, info->src_width * 4,
+            (st->surface->canvas, &info->dest, data,
+             info->src_width, info->src_height, stride,
              NULL /* FIXME: st->clip */ );
         if (st->surface->primary)
             emit_invalidate(channel, &info->dest);