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video-converter: detect identity matrix

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Do nothing if we have an identity matrix conversion.
This commit is contained in:
Wim Taymans 2015-03-09 16:01:19 +01:00
parent cf572ae2cb
commit 6ee67a8aa1
1 changed files with 31 additions and 0 deletions
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31
gst-libs/gst/video/video-converter.c
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@ -973,6 +973,34 @@ is_ayuv_to_rgb_matrix (MatrixData * data)
return TRUE;
}
static gboolean
is_identity_matrix (MatrixData * data)
{
gint i, j;
gint c = data->im[0][0];
/* not really checking identity because of rounding errors but given
* the conversions we do we just check for anything that looks like:
*
* c 0 0 0
* 0 c 0 0
* 0 0 c 0
* 0 0 0 1
*/
for (i = 0; i < 4; i++) {
for (j = 0; j < 4; j++) {
if (i == j) {
if (i == 3 && data->im[i][j] != 1)
return FALSE;
else if (data->im[i][j] != c)
return FALSE;
} else if (data->im[i][j] != 0)
return FALSE;
}
}
return TRUE;
}
static void
video_converter_matrix16 (MatrixData * data, gpointer pixels)
{
@ -1004,6 +1032,9 @@ video_converter_matrix16 (MatrixData * data, gpointer pixels)
static void
prepare_matrix (GstVideoConverter * convert, MatrixData * data)
{
if (is_identity_matrix (data))
return;
color_matrix_scale_components (data, SCALE_F, SCALE_F, SCALE_F);
color_matrix_convert (data);