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compositor: Factor-out rectangle-obscuring check

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We're going to use this for checking if one of the pads obscures the
background.
This commit is contained in:
Nirbheek Chauhan 2019-05-26 17:29:23 +02:00
parent a3462a2c6d
commit ecec30c1ca
1 changed files with 34 additions and 25 deletions
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59
gst/compositor/compositor.c
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@ -311,6 +311,39 @@ clamp_rectangle (gint x, gint y, gint w, gint h, gint outer_width,
return clamped;
}
/* Call this with the lock taken */
static gboolean
_pad_obscures_rectangle (GstVideoAggregatorPad * pad, GstVideoRectangle rect)
{
GstVideoRectangle pad_rect;
GstCompositorPad *cpad = GST_COMPOSITOR_PAD (pad);
/* No buffer to obscure the rectangle with */
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. */
if (cpad->alpha != 1.0 || GST_VIDEO_INFO_HAS_ALPHA (&pad->info))
return FALSE;
pad_rect.x = cpad->xpos;
pad_rect.y = cpad->ypos;
/* Handle pixel and display aspect ratios to find the actual size */
_mixer_pad_get_output_size (cpad, GST_VIDEO_INFO_PAR_N (&vagg->info),
GST_VIDEO_INFO_PAR_D (&vagg->info), &(pad_rect.w), &(pad_rect.h));
if (!is_rectangle_contained (rect, pad_rect))
return FALSE;
GST_DEBUG_OBJECT (pad, "Pad %s %ix%i@(%i,%i) obscures rect %ix%i@(%i,%i)",
GST_PAD_NAME (pad), pad_rect.w, pad_rect.h, pad_rect.x, pad_rect.y,
rect.w, rect.h, rect.x, rect.y);
return TRUE;
}
static gboolean
gst_compositor_pad_prepare_frame (GstVideoAggregatorPad * pad,
GstVideoAggregator * vagg, GstBuffer * buffer,
@ -360,32 +393,8 @@ gst_compositor_pad_prepare_frame (GstVideoAggregatorPad * pad,
* higher-zorder frames */
l = g_list_find (GST_ELEMENT (vagg)->sinkpads, pad)->next;
for (; l; l = l->next) {
GstVideoRectangle frame2_rect;
GstVideoAggregatorPad *pad2 = l->data;
GstCompositorPad *cpad2 = GST_COMPOSITOR_PAD (pad2);
gint pad2_width, pad2_height;
_mixer_pad_get_output_size (cpad2, GST_VIDEO_INFO_PAR_N (&vagg->info),
GST_VIDEO_INFO_PAR_D (&vagg->info), &pad2_width, &pad2_height);
/* We don't need to clamp the coords of the second rectangle */
frame2_rect.x = cpad2->xpos;
frame2_rect.y = cpad2->ypos;
frame2_rect.w = pad2_width;
frame2_rect.h = pad2_height;
/* Check if there's a buffer to be aggregated, ensure it can't have an alpha
* channel, then check opacity and frame boundaries */
if (gst_video_aggregator_pad_has_current_buffer (pad2)
&& cpad2->alpha == 1.0 && !GST_VIDEO_INFO_HAS_ALPHA (&pad2->info)
&& is_rectangle_contained (frame_rect, frame2_rect)) {
if (_pad_obscures_rectangle (l->data, frame_rect)) {
frame_obscured = TRUE;
GST_DEBUG_OBJECT (pad, "%ix%i@(%i,%i) obscured by %s %ix%i@(%i,%i) "
"in output of size %ix%i; skipping frame", frame_rect.w, frame_rect.h,
frame_rect.x, frame_rect.y, GST_PAD_NAME (pad2), frame2_rect.w,
frame2_rect.h, frame2_rect.x, frame2_rect.y,
GST_VIDEO_INFO_WIDTH (&vagg->info),
GST_VIDEO_INFO_HEIGHT (&vagg->info));
break;
}
}