From fa65e2f63ac4ac7d2a2030191df0842a31bc5501 Mon Sep 17 00:00:00 2001
From: Michael Niedermayer <michaelni@gmx.at>
Date: Sun, 15 Apr 2007 01:27:34 +0000
Subject: [PATCH] improve horizontal chroma resolution with pal
Originally committed as revision 22994 to svn://svn.mplayerhq.hu/mplayer/trunk/libswscale
---
libswscale/swscale.c | 5 ++++-
libswscale/swscale_template.c | 8 +++-----
2 files changed, 7 insertions(+), 6 deletions(-)
diff --git a/libswscale/swscale.c b/libswscale/swscale.c
index 1b21a2f463d..0dec5e5e8e6 100644
--- a/libswscale/swscale.c
+++ b/libswscale/swscale.c
@@ -2036,7 +2036,10 @@ SwsContext *sws_getContext(int srcW, int srcH, int srcFormat, int dstW, int dstH
c->chrSrcVSubSample+= c->vChrDrop;
// drop every 2. pixel for chroma calculation unless user wants full chroma
- if((isBGR(srcFormat) || isRGB(srcFormat)) && !(flags&SWS_FULL_CHR_H_INP))
+ if((isBGR(srcFormat) || isRGB(srcFormat)) && !(flags&SWS_FULL_CHR_H_INP)
+ && srcFormat!=PIX_FMT_RGB8 && srcFormat!=PIX_FMT_BGR8
+ && srcFormat!=PIX_FMT_RGB4 && srcFormat!=PIX_FMT_BGR4
+ && srcFormat!=PIX_FMT_RGB4_BYTE && srcFormat!=PIX_FMT_BGR4_BYTE)
c->chrSrcHSubSample=1;
if(param){
diff --git a/libswscale/swscale_template.c b/libswscale/swscale_template.c
index a8616efcb0c..61f8705a4cd 100644
--- a/libswscale/swscale_template.c
+++ b/libswscale/swscale_template.c
@@ -2296,12 +2296,10 @@ static inline void RENAME(palToUV)(uint8_t *dstU, uint8_t *dstV, uint8_t *src1,
assert(src1 == src2);
for(i=0; i<width; i++)
{
- int d0= src1[2*i ];
- int d1= src1[2*i+1];
- int p = (pal[d0]&0xFF00FF) + (pal[d1]&0xFF00FF);
+ int p= pal[src1[i]];
- dstU[i]= (pal[d0]+pal[d1]-p)>>9;
- dstV[i]= p>>17;
+ dstU[i]= p>>8;
+ dstV[i]= p>>16;
}
}
--
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