compositor: fix drawing of transparent background
authorMathieu Duponchelle <mathieu@centricular.com>
Thu, 18 Feb 2021 15:16:33 +0000 (16:16 +0100)
committerGStreamer Merge Bot <gitlab-merge-bot@gstreamer-foundation.org>
Mon, 1 Mar 2021 23:38:35 +0000 (23:38 +0000)
commitdd71f359be577eea666fba8d533262557c059830
tree74ca2da9a5d81c7d9fd1dc64bd1971c0c3c7cb8a
parent11b5ebd05826f9bc3354dd6c35d2f23beba2971a
compositor: fix drawing of transparent background

When drawing the background multithreaded, y_start needs to be
scaled to obtain the correct byte offset from which to start
memsetting (yoffset).

Fixes #871

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-base/-/merge_requests/1042>
gst/compositor/compositor.c