Enlightenment CVS committal
Author : raster
Project : e17
Module : libs/evas
Dir : e17/libs/evas/src/lib/engines/common
Modified Files:
evas_convert_yuv.c
Log Message:
more comments
===================================================================
RCS file:
/cvsroot/enlightenment/e17/libs/evas/src/lib/engines/common/evas_convert_yuv.c,v
retrieving revision 1.2
retrieving revision 1.3
diff -u -3 -r1.2 -r1.3
--- evas_convert_yuv.c 10 Dec 2003 01:35:37 -0000 1.2
+++ evas_convert_yuv.c 10 Dec 2003 06:55:18 -0000 1.3
@@ -107,6 +107,12 @@
/* from mmx I think :( It might be possible to use SSE and SSE2 here, but */
/* I haven't tried yet. Let's see. */
+/* NB: XviD has almost the same code in it's assembly YV12->RGB code. same */
+/* algorithm, same constants, same all over actually, except it actually */
+/* does a few extra memory accesses that this one doesn't, so in theory */
+/* this code should be faster. In the end it's all just an mmx version of */
+/* the reference implimentation done with fixed point math */
+
static void
_evas_yv12torgb_mmx(unsigned char **yuv, unsigned char *rgb, int w, int h)
{
@@ -126,21 +132,20 @@
vp = yuv[h + (h / 2) + (yy / 2)];
for (xx = 0; xx < (w - 7); xx += 8)
{
+ movd_m2r(*up, mm3);
+ movd_m2r(*vp, mm2);
movq_m2r(*yp1, mm0);
+
+ pxor_r2r(mm7, mm7);
+ punpcklbw_r2r(mm7, mm2);
+ punpcklbw_r2r(mm7, mm3);
+
movq_r2r(mm0, mm1);
psrlw_i2r(8, mm0);
psllw_i2r(8, mm1);
psrlw_i2r(8, mm1);
- pxor_r2r(mm7, mm7);
- movd_m2r(*up, mm3);
- movd_m2r(*vp, mm2);
-
- punpcklbw_r2r(mm7, mm2);
- punpcklbw_r2r(mm7, mm3);
-
movq_m2r(CONST_16, mm4);
-
psubsw_r2r(mm4, mm0);
psubsw_r2r(mm4, mm1);
@@ -154,13 +159,10 @@
movq_m2r(CONST_CRVCRV, mm7);
pmullw_r2r(mm3, mm7);
-
movq_m2r(CONST_CBUCBU, mm6);
pmullw_r2r(mm2, mm6);
-
movq_m2r(CONST_CGUCGU, mm5);
pmullw_r2r(mm2, mm5);
-
movq_m2r(CONST_CGVCGV, mm4);
pmullw_r2r(mm3, mm4);
@@ -213,7 +215,6 @@
punpcklbw_r2r(mm5, mm7);
por_r2r(mm7, mm0);
-// pxor_r2r(mm1, mm1);
movq_m2r(CONST_FF, mm1);
movq_r2r(mm0, mm5);
movq_r2r(mm3, mm6);
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