mirrors/gstreamer
mirrors/gstreamer
1
1
Fork 0
mirror of https://gitlab.freedesktop.org/gstreamer/gstreamer.git synced 2024-12-18 22:36:33 +00:00
Code Issues 1 Projects Releases Wiki Activity

gst/videoscale/vs_scanline.c: Revert optimization in videoscale. It should go in liboil and have an appropriate liboi...

Browse source 
Original commit message from CVS:
* gst/videoscale/vs_scanline.c:
(vs_scanline_resample_nearest_RGBA):
Revert optimization in videoscale. It should go in liboil and have
an appropriate liboil function.
This commit is contained in:
Edward Hervey 2006-02-28 12:19:11 +00:00
parent 77ff8c9fdb
commit 4cb1a6bd3a
2 changed files with 13 additions and 42 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

7
ChangeLog
View file

@ -1,3 +1,10 @@
2006-02-28 Edward Hervey <edward@fluendo.com>
* gst/videoscale/vs_scanline.c:
(vs_scanline_resample_nearest_RGBA):
Revert optimization in videoscale. It should go in liboil and have
an appropriate liboil function.
2006-02-28 Wim Taymans <wim@fluendo.com> 2006-02-28 Wim Taymans <wim@fluendo.com>
* gst-libs/gst/audio/gstbaseaudiosink.c: * gst-libs/gst/audio/gstbaseaudiosink.c:

48
gst/videoscale/vs_scanline.c
View file

@ -29,7 +29,6 @@
#include <liboil/liboil.h> #include <liboil/liboil.h>
#include <glib.h> #include <glib.h>
#include <stdio.h>
/* greyscale, i.e., single componenet */ /* greyscale, i.e., single componenet */
@ -115,57 +114,22 @@ void
vs_scanline_resample_nearest_RGBA (guint8 * dest, guint8 * src, int n, vs_scanline_resample_nearest_RGBA (guint8 * dest, guint8 * src, int n,
int *accumulator, int increment) int *accumulator, int increment)
{ {
guint8 *tmpsrc;
int acc = *accumulator; int acc = *accumulator;
int i; int i;
int j; int j;
int x; int x;
/* Optimization Pass #1 : for (i = 0; i < n; i++) {
* - Unroll loop by 16
* - Pointer arithmetics (most CPUs have DAGs !)
* - Avoid useless branching
*/
for (i = 0, tmpsrc = src; i < n; i++) {
j = acc >> 16; j = acc >> 16;
x = acc & 0xffff; x = acc & 0xffff;
dest[i * 4 + 0] = (x < 32768) ? src[j * 4 + 0] : src[j * 4 + 4];
dest[i * 4 + 1] = (x < 32768) ? src[j * 4 + 1] : src[j * 4 + 5];
dest[i * 4 + 2] = (x < 32768) ? src[j * 4 + 2] : src[j * 4 + 6];
dest[i * 4 + 3] = (x < 32768) ? src[j * 4 + 3] : src[j * 4 + 7];
if (x < 32768) { acc += increment;
tmpsrc = src + j * 4;
*dest++ = *tmpsrc++;
/* We do it here to avoid low-level instruction locks */
acc += increment;
*dest++ = *tmpsrc++;
*dest++ = *tmpsrc++;
*dest++ = *tmpsrc++;
} else {
tmpsrc = src + (j + 1) * 4;;
*dest++ = *tmpsrc++;
/* We do it here to avoid low-level instruction locks */
acc += increment;
*dest++ = *tmpsrc++;
*dest++ = *tmpsrc++;
*dest++ = *tmpsrc++;
}
} }
/* --- Unoptimized code BEGIN ---
for (i = 0; i < n; i++) {
j = acc >> 16;
x = acc & 0xffff;
dest[i * 4 + 0] = (x < 32768) ? src[j * 4 + 0] : src[j * 4 + 4];
dest[i * 4 + 1] = (x < 32768) ? src[j * 4 + 1] : src[j * 4 + 5];
dest[i * 4 + 2] = (x < 32768) ? src[j * 4 + 2] : src[j * 4 + 6];
dest[i * 4 + 3] = (x < 32768) ? src[j * 4 + 3] : src[j * 4 + 7];
acc += increment;
}
--- Unoptimized code END --- */
*accumulator = acc; *accumulator = acc;
} }