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convert palette to yuv instead of converting each pixel after pal->rgb 

Originally committed as revision 22993 to svn://svn.mplayerhq.hu/mplayer/trunk/libswscale
This commit is contained in:
Michael Niedermayer 2007-04-15 00:53:32 +00:00
parent fe2ad119e9
commit 21c08a3f1c
2 changed files with 25 additions and 14 deletions
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27
libswscale/swscale.c
View File

@ -2438,6 +2438,9 @@ SwsContext *sws_getContext(int srcW, int srcH, int srcFormat, int dstW, int dstH
*/
int sws_scale(SwsContext *c, uint8_t* src[], int srcStride[], int srcSliceY,
int srcSliceH, uint8_t* dst[], int dstStride[]){
int i;
uint8_t* src2[4]= {src[0], src[1], src[2]};
uint32_t pal[256];
if (c->sliceDir == 0 && srcSliceY != 0 && srcSliceY + srcSliceH != c->srcH) {
av_log(c, AV_LOG_ERROR, "swScaler: slices start in the middle!\n");
return 0;
@ -2446,24 +2449,38 @@ int sws_scale(SwsContext *c, uint8_t* src[], int srcStride[], int srcSliceY,
if (srcSliceY == 0) c->sliceDir = 1; else c->sliceDir = -1;
}
if(c->srcFormat == PIX_FMT_PAL8){
for(i=0; i<256; i++){
int p= ((uint32_t*)(src[1]))[i];
int r= (p>>16)&0xFF;
int g= (p>> 8)&0xFF;
int b= p &0xFF;
int y= av_clip_uint8(((RY*r + GY*g + BY*b)>>RGB2YUV_SHIFT) + 16 );
int u= av_clip_uint8(((RU*r + GU*g + BU*b)>>RGB2YUV_SHIFT) + 128);
int v= av_clip_uint8(((RV*r + GV*g + BV*b)>>RGB2YUV_SHIFT) + 128);
pal[i]= y + (u<<8) + (v<<16);
}
src2[1]= pal;
}
// copy strides, so they can safely be modified
if (c->sliceDir == 1) {
uint8_t* src2[4]= {src[0], src[1], src[2]};
// slices go from top to bottom
int srcStride2[4]= {srcStride[0], srcStride[1], srcStride[2]};
int dstStride2[4]= {dstStride[0], dstStride[1], dstStride[2]};
return c->swScale(c, src2, srcStride2, srcSliceY, srcSliceH, dst, dstStride2);
} else {
// slices go from bottom to top => we flip the image internally
uint8_t* src2[4]= {src[0] + (srcSliceH-1)*srcStride[0],
src[1] + ((srcSliceH>>c->chrSrcVSubSample)-1)*srcStride[1],
src[2] + ((srcSliceH>>c->chrSrcVSubSample)-1)*srcStride[2]
};
uint8_t* dst2[4]= {dst[0] + (c->dstH-1)*dstStride[0],
dst[1] + ((c->dstH>>c->chrDstVSubSample)-1)*dstStride[1],
dst[2] + ((c->dstH>>c->chrDstVSubSample)-1)*dstStride[2]};
int srcStride2[4]= {-srcStride[0], -srcStride[1], -srcStride[2]};
int dstStride2[4]= {-dstStride[0], -dstStride[1], -dstStride[2]};
src2[0] += (srcSliceH-1)*srcStride[0];
if(c->srcFormat != PIX_FMT_PAL8)
src2[1] += ((srcSliceH>>c->chrSrcVSubSample)-1)*srcStride[1];
src2[2] += ((srcSliceH>>c->chrSrcVSubSample)-1)*srcStride[2];
return c->swScale(c, src2, srcStride2, c->srcH-srcSliceY-srcSliceH, srcSliceH, dst2, dstStride2);
}

12
libswscale/swscale_template.c
View File

@ -2285,11 +2285,8 @@ static inline void RENAME(palToY)(uint8_t *dst, uint8_t *src, int width, uint32_
for(i=0; i<width; i++)
{
int d= src[i];
int b= pal[d] &0xFF;
int g=(pal[d]>>8 )&0xFF;
int r= pal[d]>>16;
dst[i]= ((RY*r + GY*g + BY*b)>>RGB2YUV_SHIFT) + 16;
dst[i]= pal[d] & 0xFF;
}
}
@ -2302,12 +2299,9 @@ static inline void RENAME(palToUV)(uint8_t *dstU, uint8_t *dstV, uint8_t *src1,
int d0= src1[2*i ];
int d1= src1[2*i+1];
int p = (pal[d0]&0xFF00FF) + (pal[d1]&0xFF00FF);
int g = (pal[d0]+pal[d1]-p)>>8;
int b= p&0x1FF;
int r= p>>16;
dstU[i]= ((RU*r + GU*g + BU*b)>>(RGB2YUV_SHIFT+1)) + 128;
dstV[i]= ((RV*r + GV*g + BV*b)>>(RGB2YUV_SHIFT+1)) + 128;
dstU[i]= (pal[d0]+pal[d1]-p)>>9;
dstV[i]= p>>17;
}
}