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kate: do not clear out high bits from display area

Browse source 
http://dvd.sourceforge.net/spu_notes does not mention that high bits
are to be masked, and not clearing them makes a sample work, where
clearing them yielded left > right.
History from the dvdspu plugin, from where this code was copied,
does not shed any light, as tracing this code's origin shows
the same bitmasks being there in 2007 when it was imported.

https://bugzilla.gnome.org/show_bug.cgi?id=657091
This commit is contained in:
Vincent Penquerc'h 2011-08-22 17:15:10 +01:00 committed by Sebastian Dröge
parent c437541791
commit 46cfb5fa4f
1 changed files with 4 additions and 4 deletions
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8
ext/kate/gstkatespu.c
View file

@ -62,10 +62,10 @@ gst_kate_spu_decode_alpha (GstKateEnc * ke, const guint8 * ptr)
static void
gst_kate_spu_decode_area (GstKateEnc * ke, const guint8 * ptr)
{
ke->spu_left = ((((guint16) ptr[0]) & 0x3f) << 4) | (ptr[1] >> 4);
ke->spu_top = ((((guint16) ptr[3]) & 0x3f) << 4) | (ptr[4] >> 4);
ke->spu_right = ((((guint16) ptr[1]) & 0x03) << 8) | ptr[2];
ke->spu_bottom = ((((guint16) ptr[4]) & 0x03) << 8) | ptr[5];
ke->spu_left = ((((guint16) ptr[0]) & 0xff) << 4) | (ptr[1] >> 4);
ke->spu_top = ((((guint16) ptr[3]) & 0xff) << 4) | (ptr[4] >> 4);
ke->spu_right = ((((guint16) ptr[1]) & 0x0f) << 8) | ptr[2];
ke->spu_bottom = ((((guint16) ptr[4]) & 0x0f) << 8) | ptr[5];
GST_DEBUG_OBJECT (ke, "SPU area %u %u -> %u %d", ke->spu_left, ke->spu_top,
ke->spu_right, ke->spu_bottom);
}