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videotestsrc: Keep tmpline unchanged in_convert_tmpline

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This will allow us to repeatedly
call it to render subsequent lines.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-base/-/merge_requests/1063>
This commit is contained in:
Jan Alexander Steffens (heftig) 2021-03-12 20:57:13 +01:00 committed by Francisco Javier Velázquez-García
parent d8a7fc0a0b
commit 96decaf7ef
1 changed files with 18 additions and 3 deletions
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21
gst/videotestsrc/videotestsrc.c
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@ -256,11 +256,21 @@ videotestsrc_convert_tmpline (paintinfo * p, GstVideoFrame * frame, int j)
int height = frame->info.height;
int n_lines = p->n_lines;
int offset = p->offset;
guint8 *tmpline = p->tmpline, *tmpline2 = p->tmpline2;
/* `tmpline2` is only used here and when the shift amount `x` is
* non-zero, which only applies when `horizontal-speed` is set.
*
* Instead of copying the rotated line back to `tmpline` for
* `p->convert_tmpline` to use, swap the pointers briefly. Besides
* being cheaper, this also lets us reuse the painted `tmpline` for
* subsequent lines.
*/
if (x != 0) {
memcpy (p->tmpline2, p->tmpline, width * 4);
memcpy (p->tmpline, p->tmpline2 + x * 4, (width - x) * 4);
memcpy (p->tmpline + (width - x) * 4, p->tmpline2, x * 4);
memcpy (tmpline2, tmpline + x * 4, (width - x) * 4);
memcpy (tmpline2 + (width - x) * 4, tmpline, x * 4);
p->tmpline = tmpline2;
p->tmpline2 = tmpline;
}
for (i = width; i < width + 5; i++) {
@ -278,6 +288,11 @@ videotestsrc_convert_tmpline (paintinfo * p, GstVideoFrame * frame, int j)
p->convert_tmpline (p, frame, j);
}
}
if (x != 0) {
p->tmpline = tmpline;
p->tmpline2 = tmpline2;
}
}
#define BLEND1(a,b,x) ((a)*(x) + (b)*(255-(x)))