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try to avoid returning odd slices.
Originally committed as revision 30847 to svn://svn.mplayerhq.hu/mplayer/trunk/libswscale
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@ -2651,8 +2651,10 @@ static int RENAME(swScale)(SwsContext *c, const uint8_t* src[], int srcStride[],
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unsigned char *aDest=(CONFIG_SWSCALE_ALPHA && alpPixBuf) ? dst[3]+dstStride[3]*dstY : NULL;
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const int firstLumSrcY= vLumFilterPos[dstY]; //First line needed as input
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const int firstLumSrcY2= vLumFilterPos[FFMIN(dstY | ((1<<c->chrDstVSubSample) - 1), dstH-1)];
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const int firstChrSrcY= vChrFilterPos[chrDstY]; //First line needed as input
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int lastLumSrcY= firstLumSrcY + vLumFilterSize -1; // Last line needed as input
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int lastLumSrcY2=firstLumSrcY2+ vLumFilterSize -1; // Last line needed as input
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int lastChrSrcY= firstChrSrcY + vChrFilterSize -1; // Last line needed as input
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int enough_lines;
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@ -2669,7 +2671,8 @@ static int RENAME(swScale)(SwsContext *c, const uint8_t* src[], int srcStride[],
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firstChrSrcY, lastChrSrcY, lastInChrBuf);
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// Do we have enough lines in this slice to output the dstY line
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enough_lines = lastLumSrcY < srcSliceY + srcSliceH && lastChrSrcY < -((-srcSliceY - srcSliceH)>>c->chrSrcVSubSample);
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enough_lines = lastLumSrcY2 < srcSliceY + srcSliceH && lastChrSrcY < -((-srcSliceY - srcSliceH)>>c->chrSrcVSubSample);
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if (!enough_lines) {
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lastLumSrcY = srcSliceY + srcSliceH - 1;
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lastChrSrcY = chrSrcSliceY + chrSrcSliceH - 1;
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