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nearest neighbor / sdl emulation ;) scaling (-sws 4)

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git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@4402 b3059339-0415-0410-9bf9-f77b7e298cf2
This commit is contained in:
michael 2002-01-28 23:57:18 +00:00
parent 7e16ad68cd
commit 5fcf31db65
2 changed files with 26 additions and 2 deletions
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27
postproc/swscale.c
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@ -69,10 +69,13 @@ Special versions: fast Y 1:1 scaling (no interpolation in y direction)
TODO
more intelligent missalignment avoidance for the horizontal scaler
dither in C
change the distance of the u & v buffer
write special vertical cubic upscale version
Optimize C code (yv12 / minmax)
add support for packed pixel yuv input & output
add support for Y8 input & output
add BGR4 output support
add BGR32 / BGR24 input support
*/
#define ABS(a) ((a) > 0 ? (a) : (-(a)))
@ -600,6 +603,7 @@ void SwScale_YV12slice(unsigned char* src[], int srcStride[], int srcSliceY ,
case 1: flags|= SWS_BILINEAR; break;
case 2: flags|= SWS_BICUBIC; break;
case 3: flags|= SWS_X; break;
case 4: flags|= SWS_POINT; break;
default:flags|= SWS_BILINEAR; break;
}
@ -639,6 +643,23 @@ static inline void initFilter(int16_t **outFilter, int16_t **filterPos, int *out
}
}
else if(flags&SWS_POINT) // lame looking point sampling mode
{
int i;
int xDstInSrc;
filterSize= 1;
filter= (double*)memalign(8, dstW*sizeof(double)*filterSize);
xDstInSrc= xInc/2 - 0x8000;
for(i=0; i<dstW; i++)
{
int xx= (xDstInSrc>>16) - (filterSize>>1) + 1;
(*filterPos)[i]= xx;
filter[i]= 1.0;
xDstInSrc+= xInc;
}
}
else if(xInc <= (1<<16) || (flags&SWS_FAST_BILINEAR)) // upscale
{
int i;
@ -1203,6 +1224,8 @@ SwsContext *getSwsContext(int srcW, int srcH, int srcFormat, int dstW, int dstH,
fprintf(stderr, "\nSwScaler: BILINEAR scaler ");
else if(flags&SWS_BICUBIC)
fprintf(stderr, "\nSwScaler: BICUBIC scaler ");
else if(flags&SWS_POINT)
fprintf(stderr, "\nSwScaler: POINT scaler ");
else
fprintf(stderr, "\nSwScaler: ehh flags invalid?! ");
@ -1430,7 +1453,7 @@ static SwsVector *diffVec(SwsVector *a, SwsVector *b){
static SwsVector *getShiftedVec(SwsVector *a, int shift){
int length= a->length + ABS(shift)*2;
double *coeff= memalign(sizeof(double), length*sizeof(double));
int i, j;
int i;
SwsVector *vec= malloc(sizeof(SwsVector));
vec->coeff= coeff;

1
postproc/swscale.h
View File

@ -21,6 +21,7 @@
#define SWS_BILINEAR 2
#define SWS_BICUBIC 4
#define SWS_X 8
#define SWS_POINT 0x10
#define SWS_FULL_UV_IPOL 0x100
#define SWS_PRINT_INFO 0x1000