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video-scaler: add support for copy

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When no scalers are given, simply do a copy of the requested area.
This commit is contained in:
Wim Taymans 2015-02-25 16:49:20 +01:00
parent 3046935e03
commit 330fb44a6f
1 changed files with 29 additions and 12 deletions
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41
gst-libs/gst/video/video-scaler.c
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@ -1353,18 +1353,18 @@ no_func:
* @src: source pixels
* @src_stride: source pixels stride
* @dest: destination pixels
* @dest_stride: sinationource pixels stride
* @dest_stride: destination pixels stride
* @x: the horizontal destination offset
* @y: the vertical destination offset
* @width: the number of pixels to scale
* @height: the number of lines to scale
* @width: the number of output pixels to scale
* @height: the number of output lines to scale
*
* Scale a rectangle of pixels in @src with @src_stride to @dest with
* @dest_stride using the horizontal scaler @hscaler and the vertical
* scaler @vscale.
*
* One of @hscale and @vscale can be NULL to only perform scaling in
* one dimension.
* One or both of @hscale and @vscale can be NULL to only perform scaling in
* one dimension or do a copy without scaling.
*
* @x and @y are the coordinates in the destination image to process.
*/
@ -1379,7 +1379,6 @@ gst_video_scaler_2d (GstVideoScaler * hscale, GstVideoScaler * vscale,
GstVideoScalerVFunc vfunc;
gint i;
g_return_if_fail (hscale != NULL || vscale != NULL);
g_return_if_fail (src != NULL);
g_return_if_fail (dest != NULL);
@ -1392,13 +1391,31 @@ gst_video_scaler_2d (GstVideoScaler * hscale, GstVideoScaler * vscale,
#define TMP_LINE(s,i,v) ((guint8 *)(s->tmpline1) + (((i) % (v)) * (sizeof (gint32) * width * n_elems)))
if (vscale == NULL) {
if (hscale->tmpwidth < width)
realloc_tmplines (hscale, n_elems, width);
if (hscale == NULL) {
guint xo, xw;
guint8 *s, *d;
/* only horizontal scaling */
for (i = y; i < height; i++) {
hfunc (hscale, LINE (src, src_stride, i), LINE (dest, dest_stride, i),
x, width, n_elems);
xo = x * n_elems;
xw = width * n_elems;
s = LINE (src, src_stride, y) + xo;
d = LINE (dest, dest_stride, y) + xo;
/* no scaling, do memcpy */
for (i = y; i < height; i++) {
memcpy (d, s, xw);
d += dest_stride;
s += src_stride;
}
} else {
if (hscale->tmpwidth < width)
realloc_tmplines (hscale, n_elems, width);
/* only horizontal scaling */
for (i = y; i < height; i++) {
hfunc (hscale, LINE (src, src_stride, i), LINE (dest, dest_stride, i),
x, width, n_elems);
}
}
} else {
guint v_taps;