mirrors/gstreamer
mirrors/gstreamer
1
1
Fork 0
mirror of https://gitlab.freedesktop.org/gstreamer/gstreamer.git synced 2025-04-25 18:14:15 +00:00
Code Issues 1 Projects Releases Wiki Activity

compositor: Alpha inputs with the SOURCE operator can be considered opaque

Browse source 
We don't have to look at each pixel's alpha component because we will
directly write it over the background.
This commit is contained in:
Sebastian Dröge 2020-01-07 20:01:14 +02:00
parent c7a9a966b0
commit 18ee5e57fd
1 changed files with 6 additions and 5 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

11
gst/compositor/compositor.c
View file

@ -324,11 +324,12 @@ _pad_obscures_rectangle (GstVideoAggregator * vagg, GstVideoAggregatorPad * pad,
if (!gst_video_aggregator_pad_has_current_buffer (pad)) if (!gst_video_aggregator_pad_has_current_buffer (pad))
return FALSE; return FALSE;
/* Can't obscure if it's transparent and if the format has an alpha component /* Can't obscure if it's transparent and if the format has an alpha
* we'd have to inspect every pixel to know if the frame is opaque, so assume * component we'd have to inspect every pixel to know if the frame is
* it doesn't obscure. As a bonus, if the rectangle is fully transparent, we * opaque, so assume it doesn't obscure unless it uses the SOURCE operator.
* can also obscure it if we have alpha components on the pad */ * As a bonus, if the rectangle is fully transparent, we can also obscure it
if (!rect_transparent && * if we have alpha components on the pad */
if (cpad->op != COMPOSITOR_OPERATOR_SOURCE && !rect_transparent &&
(cpad->alpha != 1.0 || GST_VIDEO_INFO_HAS_ALPHA (&pad->info))) (cpad->alpha != 1.0 || GST_VIDEO_INFO_HAS_ALPHA (&pad->info)))
return FALSE; return FALSE;