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comment algorithm

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Original commit message from CVS:
comment algorithm
This commit is contained in:
Thomas Vander Stichele 2004-07-22 16:43:15 +00:00
parent e4916f9cbb
commit e9bc7e575b
2 changed files with 20 additions and 11 deletions
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6
ChangeLog
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@ -1,3 +1,9 @@
2004-07-22 Thomas Vander Stichele <thomas at apestaart dot org>
* gst/videoscale/videoscale.c: (gst_videoscale_planar411),
(gst_videoscale_scale_nearest_16bit):
comment algorithm
2004-07-22 Thomas Vander Stichele <thomas at apestaart dot org>
* gst/videotestsrc/gstvideotestsrc.c:

25
gst/videoscale/videoscale.c
View file

@ -778,18 +778,20 @@ gst_videoscale_scale_nearest_16bit (GstVideoscale * scale,
guchar *destp;
guchar *srcp;
GST_LOG_OBJECT (scale, "scaling nearest %p %p %d", src, dest, dw);
GST_LOG_OBJECT (scale, "scaling nearest from %p to %p, destination width %d",
src, dest, dw);
ypos = 0;
yinc = (sh << 16) / dh;
yinc = (sh << 16) / dh; /* 16 bit fixed point arithmetic */
xinc = (sw << 16) / dw;
for (y = dh; y; y--) {
/* go over all destination lines */
for (y = dh; y; y--) { /* faster than 0 .. dh */
if (ypos >= 0x10000) {
src += (ypos >> 16) * sw * 2;
ypos &= 0xffff;
if (ypos >= 0x10000) { /* ypos >= 1 ? */
src += (ypos >> 16) * sw * 2; /* go down round(ypos) src lines */
ypos &= 0xffff; /* ypos %= 1 */
}
xpos = 0;
@ -797,17 +799,18 @@ gst_videoscale_scale_nearest_16bit (GstVideoscale * scale,
srcp = src;
destp = dest;
/* go over all destination pixels for each line */
for (x = dw; x; x--) {
if (xpos >= 0x10000) {
srcp += (xpos >> 16) * 2;
xpos &= 0xffff;
if (xpos >= 0x10000) { /* xpos >= 1 ? */
srcp += (xpos >> 16) * 2; /* go right round(xpos) src pixels */
xpos &= 0xffff; /* xpos %= 1 */
}
destp[0] = srcp[0];
destp[1] = srcp[1];
destp += 2;
destp += 2; /* go right one destination pixel */
xpos += xinc;
}
dest += dw * 2;
dest += dw * 2; /* go down one destination line */
ypos += yinc;
}