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

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